Subject: Record Notes of the 8th Meeting on PSS Tuning of

E-mail/Website

भारत सरकार

कें द्रीय विद्यतु प्राविकरण

दविण िते्रीय विद्यतु सविवत

29, रेसकोसस क्रास रोड

बेंगलरू - 065 550

Government of India

Central Electricity Authority

Southern Regional Power Committee

29, Race Course Cross Road

Bengaluru - 560 009

Web site: www.srpc.kar.nic.in Email: [email protected] Phone: 080-22287205

सं/No. SRPC/SE(O)/8th PSS2021/ दिन ंक /Date 18th May 2021

सेवा में / To

As per mailing list

Subject: Record Notes of the 8th Meeting on PSS Tuning of Generators- reg.

िहोदय /Sir,

Enclosed, please find the Record Notes of the 8th meeting on PSS Tuning of Generators

held on 20th April 2021 through Video Conferencing for kind needful please.

Yours faithfully,

(मेका रामकृष्ण/ K P MADHU)

अधीक्षण अभियन्ता /Superintending Engineer

Mailing list for the Meeting on PSS tuning of Generators.

1. Executive Director, SRLDC, Bengaluru

2. General Manager, CTU, PGCIL, Gurgaon

3. Chief Engineer (Gen), APGENCO, Vijayawada

4. Chief Engineer (HPC & Hydro Projects), APGENCO, Vijayawada

5. Chief Engineer (ED), KPCL, Bengaluru

6. Chief Engineer (Project & ED), KSEBL, Thiruvananthapuram

7. Chief Engineer (Mech. Thermal), TANGEDCO, Chennai

8. Chief Engineer (Hydro), TANGEDCO, Chennai

9. Chief Engineer (Gen.), TSGENCO, Hyderabad

10. Chief Engineer (Projects), TSGENCO, Hyderabad

11. Executive Director, Ramagundam STPS, NTPC, Ramagundam

12. Chief General Manager, Simhadri STPS, NTPC, Simhadri

13. General Manager, Talcher STPS, NTPC, Talcher

14. General Manager, Kudgi STPS, NTPC, Kudgi

15. General Manager, SRHQ, NTPC, Hyderabad

16. General Manager, CC, NTPC, New Delhi

17. General Manager Vallur TPS, NTECL

18. General Manager, TS-II, NLCIL, Neyveli

19. General Manager, TS-I Expansion, NLCIL, Neyveli

20. General Manager, TS-II Expansion, NLCIL, Neyveli

21. General Manager, NNTPS, NLCIL, Neyveli

22. General Manager, NTPL, Tuticorin

23. STE(E&I), Kaiga G S I & II, Karwar

24. OS, Kaiga G S III & IV, Karwar

25. OS, MAPS, Kalpakkam

26. OS, KKNPP, Kudankulam

27. Senior Vice President, JSWEL, Toranagallu

28. Head Operation, UPCL, Padubidri, Udupi

29. Chief Manager-Electrical, SEL, Nellore

30. Lead Engineer-Electrical, MEPL, Nellore

31. AGM, SEILP1, Nellore / Hyderabad

32. AGM, SEILP2, Nellore / Hyderabad

33. O&M Head, IL & FS, Nagipatnam

34. Advisor-Electrical, Coastal Energen, Tuticorin

35. VP, O&M, HNPCL, Vishakapatnam

36. VP(O), LKPL, Kondapalli, Ibrahimpatnam

37. Associate Vice President, Adani Power Ltd., Ahmadabad

****

Record Notes of the 8th meeting of PSS (20.04.2021) Page 1 of 5

SOUTHERN REGIONAL POWER COMMITTEE (SRPC)

Bengaluru

Record Notes of the 8th Meeting of PSS Tuning of Generators held on

20th April 2021 through VC

1. Introduction:

1.1. The 8th Meeting of PSS related issues was held on 20th April 2021 through Video

Conferencing (VC). The list of participants is at Appendix. There was no

representation from APSLDC, TSSLDC, KPTCL, NTPC (RSTPS, Simhadri STPS

& Talcher STPS-II), NPCIL (KKNPP), NLCIL (TS-II, TS-I Exp. & TS-II Exp),

HNPCL, SCCL,UPCL, JSWEL, SEIL (P-I & P-II), CEPL, ITPL (IL&FS), LKPPL,

SEL and MEL.

1.2. Shri A Balan, Member Secretary (MS), SRPC welcomed the participants to the

8th meeting of PSS. He informed that PSS testing reports had been received for 36

generator units of SR after the 7th meeting (14.11.2019) of PSS Tuning and the

analysis of the same would be presented during the course of the meeting. The

action taken status on the recommendations conveyed after 7th PSS tuning also

would be taken up. It has been observed considerable delay in carrying out the PSS

testing in the specified time period (once in three years) by most of the generators.

He requested all the generators to adhere the time line to comply the regulations and

also in view of system security.

2. Summary of Deliberation:

2.1. The following brought to the notice of the utilities:

a) As noted in the previous PSS meetings, generators to furnish required information

(Data sheets for generator, excitation system, governor (existing values) and

stabilizer model) to SRLDC. This information would be used by SRLDC in

simulation and come out with optimal gain set points, which could be used as a

reference while carrying out PSS tuning.

b) As requested in previous meetings, all generators to get in touch with OEM for

the possibility of permanent recording and logging of the PSS response which

may be helpful in assessing the PSS response in real time.

c) National Power Committee (NPC) had constituted a "Sub-group to finalize a

common procedure for Power System Stabilizers (PSS) Tuning" has been

constituted by CEA with members from RPCs, NPC, NLDC, CTU, NTPC and

NHPC.

d) The first meeting of the Sub-Group was held on 16.04.2021 wherein it was

decided that IIT Mumbai also may be consulted on arriving at final common

procedure for Power System Stabilizers (PSS) Tuning.


e) All generators/SLDCs were requested to share their experience/suggestion in

respect of PSS Tuning to SRPC so that the same would be placed before the Sub-

group to facilitate in finalization of common procedure for PSS Tuning at all India

level.

2.2. Points to be ensured for PSS tuning:

1. SRT to be carried out at 50 - 60 % and at > 80% loading

2. Both step up and step down tests to be carried out (2% to 5%).

3. Step up to be followed by step down with a time gap of 20 sec, if taken up,

simultaneously.

4. Real (Active) power scale to be within 10% of the operating point in the

graphs. Proper graphs (soft copy) with visible scale to be provided. Make,

model and type of excitation system to be provided.

5. Testing may be carried out in both the channels.

6. While furnishing the test results, MW scale in graph needs to be taken

appropriately considering the operating range for better comparison and

conclusion.

7. Final adopted settings, damping factor, damping ratio and damping torque

computation with and without PSS needs to be furnished.

8. Power system stabiliser models to be furnished along with the implemented

settings (final).

9. Generators to inform RLDC/SLDC in advance about PSS tuning schedule so

as to enable RLDC to observe nearby PMUs.

2.3. Damping Torque Calculation:

In the 7th meeting of PSS (14.11.2019), SRLDC/SRPC had agreed to look into the

aspect of M (inertia) for computation of Damping Torque. Subsequently, SRLDC

and SRPC had consulted BHEL on the issue. The following emerged:

The formulae for Damping Torque:

𝑻𝒅 =𝟐𝑴

𝑻𝒍𝒏(

𝒑𝟏

𝒑𝟐)

Where,

Td= damping torque

M= Moment of Inertia

p1, p2 = successive amplitudes

∆𝐃 ≥ 𝟏𝟎 criteria is checked for effectiveness of damping.

∆𝑫 = (𝑻𝒅) 𝒘𝒊𝒕𝒉 𝑷𝑺𝑺 𝑶𝑵 − (𝑻𝒅)𝒘𝒊𝒕𝒉 𝑷𝑺𝑺 𝑶𝑭𝑭


Method 1:

The Calculation of Damping Torque from Rotor Inertia J, Moment of Inertia (M),

Machine Inertia (H):

Gd2 of Flywheel

J (or Jeq) of rotor

Note: The Rotor Inertia J or Jeq = JTurbine Rotor + J Generator Rotor

Relation between the above two:

𝐽 = 𝐺𝑑2/4

Now value of J is known.

𝐻 =1

2.𝐽. 𝜔𝑠𝑛

2

𝑀𝑉𝐴

H= inertia constant ( MW-s / MVA) or ( MJ / MVA)

ωsn = Synchronous speed ( 2 x π x f) or (2 x π x N/60)

f= linear frequency (Hz)

N= rpm

a. Inertia Calculation from Given J

= 1

2

𝑗 . ( 2.𝜋.𝑁

60)

2∗ 10−6

𝑀𝑉𝐴

= 5.48 x 10-9 x

𝑗 . (𝑁)2

𝑀𝑉𝐴 𝑅𝑎𝑡𝑖𝑛𝑔

𝑀 = 2. 𝐻. 𝐺/ω𝑠𝑛

Where, G = Rated MVA of the generator

𝑀 = 𝐺. 𝐻/(𝜋. 𝑓)

Empirical Formula: To calculate M (if J is known):

M = 5.48 x 10-9 x

𝑗 .(𝑁)2

𝜋.𝑓


Method 2:

Approximate calculation of damping ratio from step response

1. Compute

∝ = 1

𝑇ln (

𝑃1

𝑃2)

2. Compute

ω = 2 𝜋

𝑇

ωo = ω

√1−𝜎2

3. Damping ratio

𝜎 =∝

ωo =

∝ ω

√1−𝜎2

𝜎

√1−𝜎2 =

∝

ω

𝜎2 = (∝

ω )2 - (

∝

ω )2𝜎2

𝝈 = √∝

ω

2

1+ ∝

ω

2

PSS Effectiveness = 𝝈𝒘𝒊𝒕𝒉 𝑷𝑺𝑺

𝝈𝒘𝒊𝒕𝒉𝒐𝒖𝒕 𝑷𝑺𝑺 is > 15%, then it is well damped.

P1

P2 T


2.4. The observation /comments of PSS tuning/SRT is at Annexure - I

2.5. The analysis and remarks on PSS tuning / SRT reports received after 7th meeting of

PSS is at Annexure - II.

2.6. The Status of PSS Tuning/SRT of generating Units in SR (as on 30.04.2021) is at

Annexure-III.

The units pending PSS Tuning/SRT (Due prior to the year 2019, during the years

2019, 2020 & 2021) needed to carry out the tuning and submit the report to SRPC.

2.7. Furnishing of data of units – PSS data format:

The format for furnishing data by the generating stations is given below:

Generating Company:

Sl.No. Station

Name

Unit No. Capacity

(MW)

Type of

Unit (Hydro

/Thermal)

Rotor

Inertia

('Jeq' )

Machine

Inertia/

Inertia

constant

('H' )

Moment

of

Inertia

('M')

PSS

Model

Number

of poles

All generators are to fill the data in the excel sheet (Annexure-IV) and e-mail the

same to SRPC.

This format is for interim period to collect the data. All India level format, if any,

prescribed by the “Sub-group to finalize a common procedure for Power System

Stabilizers (PSS) Tuning" needed to be followed by all.

2.8. Member Secretary, SRPC thanked the participants for the interactive participation

in analysing the PSS test reports. The Generators would look into the

recommendations/observations on the test report and necessary action would be

carried out. The schedule of PSS tuning/SRT would be adhered by all the

generators.

*****

1 8h PSS (20.04.2021) Observations

Annexure – I

Observation /comments of PSS Tuning/SRT

APGENCO

Station Name Status of PSS tuning PSS to be tuned by

Analysed during

Observations / Comments

Rayalaseema TPS U1 to U5

U1 210 13-01-16 13-01-19 3rd PSS

8th PSS: APGENCO informed that Analog AVR is to be replaced with digital AVR for U1, U2. Later PSS tuning/SRT would be carried out during forthcoming OH U2 210 13-01-16 13-01-19 3rd PSS

U3 210 13-01-16 13-01-19 3rd PSS

7th PSS: APGENCO informed PSS tuning/SRT would be carried during OH 8th PSS: APGENCO informed that PO isplaced. Awaiting response from BHEL.

U4 210 21-06-19 21-06-22 8th PSS

8th PSS: To carry out at two different loadings in the future. Generator data sheet, governor data sheets to be furnished.

U5 210 13-01-16 13-01-19 3rd PSS

7th PSS: APGENCO informed PSS tuning/SRT would be carried during OH 8th PSS: APGENCO informed that PO is placed. Awaiting response from BHEL.

U6 600 12-12-18 8th PSS

8th PSS: No conclusion can be made from the furnished plots Clearer plots with appropriate scale to be furnished after discussing with OEM. To carry out at two different steps in the future.Generator data, Excitor and PSS Parameters, functional block diagram to be furnished along with damping torque calculation


Vijayawada TPS (NTTPS) U1 to U7

U1 210 24-12-19 24-12-22 8th PSS 8th PSS: Test to be carried out at two different steps in the future. Generator data, Excitor and PSS Parameters, functional block diagram to be furnished

U2 210 24-12-19 24-12-22 8th PSS

U3 210 23-12-19 23-12-22 8th PSS

U4 210 23-12-19 23-12-22 8th PSS

U5 210 21-12-19 21-12-22 8th PSS

8th PSS: Test to be carried out at two different steps in the future. Generator data, Excitor and PSS Parameters, functional block diagram to be furnished

U6 210 11-02-19 7th PSS

7th PSS: PSS tuning/SRT is to be carried out again SRT should be carried out at a) >80% loading and b) between 50% to 80% loading range preferably at lower load. 8th PSS: APGENCO informed that PSS tuning is planned to be carried out during this year OH(somewhere between June 2021 to November 2021)

U7 500 24-12-19 24-12-22 8th PSS

8th PSS: Test to be carried out at two different steps in the future. Generator data, Excitor and PSS Parameters, functional block diagram to be furnished

SDSTPP (Krishnapatnam JV) U1 & U2

U1 800 12-04-18 12-04-21 6th PSS

The Generator, Exciter, Governor and Stabilizer Model to be provided. In future, the PSS tuning may also be carried out b/w 50% to 80 % loading of the m/c It is preferred that SRT is carried out in both the channel 1 and channel 2

U2 800 13-04-18 13-04-21 6th PSS

The Generator, Exciter, Governor and Stabilizer Model to be provided. In future, the PSS tuning may also be carried out


b/w 50% to 80 % loading of the m/c It is preferred that SRT is carried out in both the channel 1 and channel 2

Lower Sileru HEP U1 to U4

U1 115 13-12-16 13-12-19 4th PSS

4th PSS: SRT may be done with higher step change in the future 8th PSS. :APGENCO informed that PSS tuning is planned to be carried out in 1 month. Recommendation: LSR connected interstate lines are tripping frequently. It may lead to generation loss or local disturbance. PSS tuning to be carried out.

U2 115 N

8thPSS: APGENCO informed that PSS tuning is planned to be carried out in 1 month.

U3 115 N

8th PSS: APGENCO informed that PSS function is not there in Unit 3.

U4 115 N

8th PSS: APGENCO informed that PSS functionis not there in Unit 4. Units have completed 50years. RLA studies to be carried out by MECON ltd., Ranchi. After getting the RLA report, during the R & M period, PSS to be Recommendation: As per CEA connectivity Regulation, all units above 100 MW installed capacity should have PSS and it should be tuned. APGENCO may explore the possibility of incorporating PSS function urgently for the units 3 and 4.


Srisailam RB HEP U1 to U7

U1 110 06-10.20 06-10-23

8th PSS

8th PSS:. Channel changeover test also to be done in the future. PSS parameters, Exciter parameters, functional block diagram to be furnished.

U2 110 06-10.20 06-10-23

U3 110 06-10.20 06-10-23

U4 110 06-10.20 06-10-23

U5 110 06-10.20 06-10-23

U6 110 06-10.20 06-10-23

U7 110 06-10.20 06-10-23

AP IPP's

Station Name Status of PSS tuning PSS to be

tuned by Analysed

during Observations /

Comments

HNPCL, Vizag

U1 520 28-03-17 28-03-20 5th PSS

SRT at a different step response and 50 % loading may be carried out in the future. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided.

U2 520 27-03-17 27-03-20 5th PSS

SRT carried out. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided.

TSGENCO

Station Name Status of PSS tuning PSS to be tuned

by

Analysed during Observations / Comments

Kakatiya TPS U1 & 2

U1 500 27-02-19

7th PSS

7th PSS: No damping with PSS in service. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. Damping torque calculation to be furnished. PSS o/p is present in steady state. 8th PSS: TSGENCO/Kakatiya TPS to funish the plots/results after discussing with OEM.


U2 600 27-02-19

7th PSS

7th PSS: No damping with PSS in service. To discuss the results with OEM and revert back with appropriate graphs. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. Damping torque calculation to be furnished PSS o/p is present in steady state. 8th PSS: TSGENCO/Kakatiya TPS to funish the plots/results after discussing with OEM.

Kothagudem TPS U9 to U12

U9 250 08/10-01-20

8th PSS

8th PSS: No damping with PSS in service. PSS to be retuned TSGENCO mentioned that DAVR is planned to be changed in Units 9,10.

U10 250 08/10-01-20

8th PSS

U11 500 08/10-01-20

8th PSS

U12 800

7th PSS: TSGENCO informed PSS tuning / SRT was carried out on 30-06-2019. Report to be furnished 8th PSS: TSGENCO/Kakatiya TPS informed that PSS tuning was carried out and would submit the report

Bhadradri TPS

U1 270

8th PSS: TSGENCO informed that they are pursuing with OEM (BHEL) regarding PSS tuning

U2 270


U3 270


Nagarjunasagar HEP U1 to U8 U1 110 04-03-17 04-03-20

5th PSS

8th PSS: TSGENCO informed that they are pursuing with OEM regarding PSS tuning SRT analysed

U2 110 08-01-17 08-01-20 8th PSS: TSGENCO informed that they are pursuing with


U3 110 08-01-17 08-01-20 OEM regarding PSS tuning SRT analysed. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. may be provided for U2 to U8 along with damping torque calculation.

U4 110 07-01-17 07-01-20

U5 110 07-01-17 07-01-20

U6 110 08-01-17 08-01-20

U7 110 08-01-17 08-01-20

U8 100.8 08-01-17 08-01-20

Srisailam LB HEP U1 to U6 U1 150 20-01-17 20-01-20

5th PSS

8th PSS: TSGENCO informed that replacement with digital AVR is planned for all the 6 units around June 2021. Then PSS would be planned.

U2 150 23-01-17 23-01-20

U3 150 21-01-17 21-01-20

U4 150 19-01-17 19-01-20

U5 150 22-01-17 22-01-20

U6 150 21-01-17 21-01-20

SCCL

Station Name Status of PSS tuning PSS to be tuned

by

Analysed during Observations / Comments

Singareni Collaries U1 & 2

U1 600 30-10-17 30-10-20 6th PSS

6th PSS: SRT with PSS ON/OFF is not done. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided along with damping torque calculation. PSS tuning may also be carried out between 50% to 80% loading of the m/c.SRT plots may be submitted for analysis. It is preferred that SRT is carried out in both the channel 1 and channel 2

U2 600 30-10-17 30-10-20 6th PSS

6th PSS: SRT with PSS ON/OFF is not done. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided along with damping torque calculation. PSS tuning may also be carried out between 50% to 80% loading of the m/c. SRT plots may be submitted for analysis. It is preferred that SRT is carried out in both the channel 1 and channel 2


KPCL

Station Name Status of PSS tuning

PSS to be tuned by

Analysed during


Raichur TPS U1 to U8

U1 210 18-06-16 18-06-19 4th PSS 8th PSS: KPCL informed that PO is placed for PSS tuning/SRT

U2 210 22-08-16 22-08-19 4th PSS

U3 210 17-06-16 17-06-19 4th PSS

U4 210 06-09-17 06-09-20 6th PSS

8th PSS: KPCL informed that PO is placed for PSS tuning/SRT SRT analysed. It is preferred that SRT is carried out in both Channels 1 & 2

U5 210 14-03-19

7th PSS

8th PSS: KPCL informed that adaptive PSS issue may be there with the DAVR system after discussion with OEM. Will revert back after discussion. KPCL to furnish comments/observations in this regard after discussing with the OEM. 7th PSS: No damping is achieved. Results to be discussed with OEM and revert to us. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. SRT should be carried out at a) >80% loading and b) between 50% to 80% loading range preferably at lower load in the future

U6 210 15-03-19

7th PSS

U7 210 02-08-19

7th PSS

U8 250 15-03-19 7th PSS

BTPS U1 to U3

U1 500 18-08-17 18-08-20 7th PSS

7th PSS: The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. Damping torque calculation needs to be furnished SRT should be carried out at a) >80% loading and b) between 50% to 80% loading range preferably at lower load in the future 8th PSS: KPCL informed that for Units 1, 2 PSS tuning/SRT was carried out in November 2020. For Unit 3 tuning/SRT was carried out in April 2021. Reports will be submitted for analysis.

U2 500 31-12-15 31-12-18 4th PSS

7th PSS: Work order placed. PSS tuning to be carried out in 6 months

U3 700 26-08-16 26-08-19 4th PSS


Yeramarus TPP U1 & U2

N

8th PSS: KPCL informed PSS tuning/SRT is planned in June 2021.

Varahi UGPH HEP U1 to U4

U1 115 17-10-19 17-10-22 7th PSS

7th PSS: The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. SRT should be carried out at a) >80% loading and b) between 50% to 80% loading range preferably at lower load in the future

U2 115 17-10-19 17-10-22 7th PSS

U3 115 18-10-19 18-10-22 7th PSS

U4 115 18-10-19 18-10-22 7th PSS

Nagjheri HEP U1 to U6

U1 150 4/5-1-2017

04-01-20 4th PSS 8th PSS: Existing DAVR to be replaced with new DAVR(issue with PSS). Taken up this issue with HO on the proposal. After replacement, PSS tuning/SRT to be carries out

U2 150 4/5-1-2017

04-01-20 4th PSS

U3 150 02-06-16 02-06-19 4th PSS

7th PSS: Unit under S/D for last 6 months. PSS tuning/SRT to be carried out at next opportunity. 8th PSS: PSS tuning/SRT was carried out in March 2020. Report will be submitted for analysis.

U4 150 4/5-1-2017

04-01-20 4th PSS

8th PSS: Existing DAVR to be replaced with new DAVR(issue with PSS). Taken up this issue with HO on the proposal. After replacement, PSS tuning/SRT to be carries out

U5 150 4/5-1-2017

04-01-20 4th PSS

8th PSS: Existing DAVR to be replaced with new DAVR(issue with PSS). Taken up this issue with HO on the proposal. After replacement, PSS tuning/SRT to be carries out SRT analysed. A higher step change may be considered in the future for the units 1, 2, 4 & 5.

U6 135 17-08-17 17-08-20 6th PSS

6th PSS: The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided along with Damping torque calculation. SRT may be carried out at a higher step in the future. It is preferred that SRT is carried out in both the channel 1 and channel 2. 8th PSS: Existing DAVR to be replaced with new DAVR(issue with PSS). Taken up this issue with HO on the proposal. After replacement, PSS tuning/SRT to be carries out


Sharavathy HEP U1 to U10

U1 103.5 7/8-6-2017

07-06-20 5th PSS

8th PSS: PSS tuning/SRT was carried out. Report submitted for analysis and will be analysed in the next meeeting The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. Higher step change may be considered in the future.

U2 103.5 7/8-6-2017

07-06-20 5th PSS

8th PSS: Tuning/SRT was carried out. Report submitted for analysis and will be analysed in the next meeting The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. Higher step change may be considered in the future.

U3 103.5 23-10-19 23-10-22 7th PSS

7th PSS: The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. Damping torque calculation needs to be furnished

U4 103.5 7/8-6-2017

07-06-20 5th PSS

8th PSS: Tuning/SRT was carried out. Report submitted for analysis and will be analysed in the next meeting The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided.. Higher step change may be considered in the future.

U5 103.5 06-11-19 06-11-22 7th PSS

7th PSS: damping is not achieved. Results to be discussed with OEM and revert back.. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. Damping torque calculation needs to be furnished 8th PSS: Ttuning/SRT was carried out. Report submitted for analysis and will be analysed in the next meeeting

U6 103.5 7/8-6-2017

07-06-20 5th PSS

8th PSS: On the day of PSS tuning, entire station was on Auxiliary of Unit 6. It coudn't be carried out on the day. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. Higher step change may be considered in the future.


U7 103.5 23-10-19 23-10-22 7th PSS


U8 103.5 13-12-17 13-12-20 6th PSS

8th PSS: PSS tuning/SRT was carried out. Report submitted for analysis and will be analysed in the next meeeting Damping torque calculation needs to be submitted. It is preferred that SRT is carried out in both the channel 1 and channel 2.

U9 103.5 31-10-19 31-10-22 7th PSS


U10 103.5

07-11-19

07-11-22 7th PSS


KAR IPPs

Station Name Status of PSS tuning PSS to be tuned by

Analysed during


UPCL U1 & U2

U1 600 04-10-15 04-10-18

3rd PSS

The SRT may be carried out at 50% load in the future. The Generator, Exciter, Governor and Stabilizer Model to be provided along with damping torque calculation.

U2 600 23-10-15 23-10-18

3rd PSS

The Generator, Exciter, Governor and Stabilizer Model to be provided along with damping torque calculation.

JSWEL U1 to U4

U1 300 15-02-17 15-02-20

5th PSS

5th PSS: SRT analyzed. PSS O/P plot is not plotted.

Same may be done in the future

U2 300 21-10-16 21-10-19

4th PSS

7th PSS: JSWEL informed that PO is placed. PSS tuning/SRT to be carried out by December 2019


U3 300 21-10-16 21-10-19 4th PSS

7th PSS: JSWEL informed that PO is placed. PSS tuning/SRT to be carried out by December 2019

U4 300 26-09-18

26-09-21

8th PSS

8th PSS: JSWEL to explain the real power oscillations variation with reasons. Generator data, Excitor and PSS Parameters along with damping torque calculation to be furnished

KSEBL

Station Name Status of PSS tuning Analysed during Observations / Comments

Idukki HEP U1 to U6

U1 130 N

8th PSS: KSEBL informed that RMU works to be completed in 3 months. Then PSS will be in service and PSS tuning will be taken up

U2 130 N


U3 130 N


U4 130 N 8th PSS: KSEBL informed that

units are having old exciter system. RMU works may start in 2023. After RMU works PSS will be taken into service

U5 130 N

U6 130 N


TANGEDCO

Station Name Status of PSS tuning PSS to

be tuned by

Analysed during


NCTPS St-1 U1 to U3

U1 210 01-04-18 01-04-21 6th PSS

PSS tuning may be carried out at two steps in the future. It is preferred that SRT is carried out in both the channel 1 and channel 2. 7th PSS: The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. ∆D is to be recalculated with appropriate values

U2 210 29-01-21 29-01-24 8th PSS

SRT analysed

U3 210 29-01-21 29-01-24

8th PSS

SRT analysed

NCTPS St-II U1 & U2

U1 600 31-08-17 31-08-20 7th PSS

8th PSS: PSS tuning/SRT Planned after AOH this year 7th PSS: damping is not achieved. To discuss the results with OEM and revert back with appropriate graphs. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. Damping torque calculation needs to be furnished

U2 600 30-08-17 30-08-20 7th PSS

7th PSS: damping is not achieved. To discuss the results with OEM and revert back with appropriate graphs. 8th PSS: PSS tuning/SRT Planned after AOH this year. Planned in July 2021 The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. Damping torque calculation needs to be furnished

Tuticorin TPS U1 to U5

U1 210 03-02-18 03-02-21 6th PSS

PSS tuning may be carried out at two steps in the future. The damping torque calculation may be furnished. It is preferred that SRT is carried out in both the channel 1 and channel 2.

U2 210 12-11-19 12-11-22 7th PSS

7th PSS: The Generator, Exciter, Governor and Stabilizer Model to be provided. Damping torque calculation is to be furnished.


U3 210 29-07-19 29-07-22 7th PSS

7th PSS: The Generator, Exciter, Governor and Stabilizer Model to be provided. Damping torque calculation is to be furnished

U4 210 31-12-

19, 10-01-20

10-01-23

8th PSS

8th PSS: Plots to be furnished with proper scale. Generator data, Excitor and PSS Parameters along with damping torque calculation to be furnished

U5 210 15-03-21 15-03-24

8th PSS

8th PSS: Generator data sheet, Excitor block diagram along with damping torque calculation to be furnished

Mettur St-I TPS U1 to U4

U1 210 08.10.20 08.10.23

8th PSS

8th PSS: To confirm Moment of Inertia "M" value. Generator data, Excitation system data to be furnished

U2 210 08.04.21

8th PSS

8th PSS: No conclusion from the submitted plots regarding effectiveness of PSS. MTPS may discuss with OEM to provide clearer plots with appropriate scale. To confirm Moment of Inertia "M" value and damping torque calculation. Generator data, Excitation system data to be furnished

U3 210 12-11-19 12-11-22 7th PSS

8th PSS: NCTPS informed that Inertia value to be discussed with OEM(BHEL) and will revert back. 7th PSS: ∆D is to be recalculated with appropriate values. SRT should be carried out at a) >80% loading and b) between 50% to 80% loading range preferably at lower load in the future

U4 210 09-11-19 09-11-22 7th PSS

7th PSS: ∆D is to be recalculated with appropriate values. Plots to be refurnished with appropriate scale and values to see the extent of damping. 8th PSS: NCTPS informed that Inertia value to be discussed with OEM(BHEL) and will revert back. SRT should be carried out at a) >80% loading and b) between 50% to 80% loading range preferably at lower load in the future


Mettur St-III TPS

U1 600 10-09-20

8th PSS: Report submitted for analysis. It will be analysed in the next meeting

Kadamparai HEP U1 to U4 U1 100 22-08-17 22-08-20 7th PSS

7th PSS: It is preferred that SRT is carried out in both the channel 1 and channel 2. Damping torque calculation needs to be furnished. SRT should be carried out at a) >80% loading and b) between 50% to 80% loading range preferably at lower load in the future

U2 100 22-08-17 22-08-20 7th PSS

U3 100 22-08-17 22-08-20 7th PSS

U4 100 22-08-17 22-08-20 7th PSS

TN IPPs


be tuned by

Analysed during


STCMS

N

8th PSS: TNSLDC is suggested to follow up the PSS tuning and furnish SRT test reports

CGS/ISGS

Station Name Status of PSS tuning

PSS to be tuned by

Analysed during


NTPC, Ramagundam STPS U1 to U7 U1 200 N

8th PSS: 105 days S/D for R&M is planned after revival of unit 3. It will come up with new DVR. Then PSS tuning will be taken up

U2 200 N

8th PSS: 105 days S/D for R&M is planned after revival of unit 1. It will come up with new DVR. Then PSS tuning will be taken up

U3 200 01-05-17 01-05-20 5th PSS

5th PSS: The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided along with damping torque calculation 8th PSS: NTPC informed that R&M works going on. Palnned to ne complted by May 2021 along with new DVR. Then PSS tuning will be taken up in June 2021. NTPC vide mail informed that PSS tuning/SRT is planned to be carried out in March 2020


U4 500 21-02-18 21-02-21 6th PSS

SRT may be also be carried out between 50% and 80% loading of the m/c. Damping torque calculation needs to be furnished. NTPC to discuss with OEM and revert back regarding oscillations. Clear SRT plots may be furnished

U5 500 28-11-18 28-11-21 7th PSS

SRT should be carried out at a) >80% loading and b) between 50% to 80% loading range preferably at lower load in the future. Damping torque calculation needs to be furnished.

U6 500 28-11-18 28-11-21 7th PSS

U7 500 19-10-16 19-10-19 4th PSS

NTPC, Ramagundam was suggested to take action to address the problem of hunting when PSS is ON by discussing the results with SRT agency

NTPC, Simhadri St-I & II U1 to U4

U1 500 04-12-19

8th PSS

8th PSS: No conclusion could be made from the submitted plots. Proper plots to be resubmitted with appropriate scale. The Generator, Exciter, Governor and Stabilizer Model along with final settings and damping torque calculation to be provided

U2 500 04-12-19

8th PSS

U3 500 05-12-19

8th PSS

U4 500 04-12-19

8th PSS

NTPC, Talcher STPS St-II U3 to U6

U3 500 04-06-16 04-06-19 3rd PSS NTPC vide mail dated 27-05-2019 informed that PSS tuning for all the 4 unit would be carried out by December 2019 7th PSS: PSS tuning/SRT for units 4 and 5 is planned to be carried out in 6 months 8th PSS: NTPC Talcher is suggested to take up the PSS tuning/SRT for all the 4 untis after the peak period has passed.

U4 500 N

U5 500 N

U6 500 04-06-16 04-06-19 3rd PSS

NTPC, Kudgi

U1 800 10-09-16 10-09-19 5th PSS

8th PSS: NTPC Kudgi is suggested to take up the PSS tuning/SRT SRT may be carried out at higher loading of the m/c (>80%) and at two steps in the future. Damping torque calculation may be furnished It is preferred that SRT is carried out in both the channel 1 and channel 2.


U2 800 02-11-17 02-11-20 6th PSS

8th PSS: NTPC Kudgi is suggested to take up the PSS tuning/SRT

SRT may be carried out between 50% and 80 % loading of the m/c and at two steps in the future. Damping torque calculation may be furnished. It is preferred that SRT is carried out in both the channel 1 and channel 2.

U3 800

29-04-18

29-04-21

7th PSS

8th PSS: NTPC Kudgi is suggested to take up the PSS tuning/SRT The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. SRT should be carried out at a) >80% loading and b) between 50% to 80% loading range preferably at lower load in the future Damping torque calculation needs to be furnished.

NTPC Kayamkulam

8th PSS: NTPC is suggested to take up the PSS tuning/SRT

NTECL, Vallur TPS U1 to U3

U1 500 10-09-19 10-09-22 7th PSS

8th PSS: NTECL to furnish the final plots and final adopted parameters after discussing with OEM. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided. Damping is not achieved at 305 MW-to discuss the results with OEM and revert back with appropriate graphs

U2 500 08-11-16 08-11-19 4th PSS

8th PSS: NTECL informed that PSS retuning is planned during July 2021. SRT may be conducted at a higher step in the future. Test may be conducted at full load and reduced loading

U3 500 07-11-16 07-11-19 4th PSS

8th PSS: NTECL informed that PSS retuning is planned during July 2021. SRT analyzed.

NLC, Neyveli TPS I Exp. U1 & U2

U1 210 12-10-15 12-10-18 3rd PSS OCC: NLCIL informed PSS tuning/SRT to be carried out after retrofitting of Static Excitation System(SES) for

U2 210 05-11-15 05-11-18 3rd PSS


both the units for units 1 and2 7th PSS: NLCIL informed that PSS tuning/SRT is planned to be carried out by December 2020 for units 1 and 2

NLC, Neyveli TPS II U1 to U7 U1 210

18/19-4-17

18-04-20 5th PSS

7th PSS: NLCIL informed that PSS tuning is planned to be

carried out by April 2020 for units 1,2 and 3

U2 210 18/19-4-

17 18-04-20 5th PSS

U3 210 18/19-4-

17 18-04-20 5th PSS

U4 210 23-12-16 23-12-19 4th PSS 7th PSS: NLCIL informed that PSS tuning is planned to be

carried out by January 2020 for units 4,5,6 and 7

U5 210 23-12-16 23-12-19 4th PSS

U6 210 23-12-16 23-12-19 4th PSS

U7 210 23-12-16 23-12-19 4th PSS

NLC, Neyveli TPS II Exp U1 & U2

U1 250 19-04-17 19-04-20 5th PSS

7th PSS: NLCIL informed that PSS tuning is planned to be

carried out by April 2020 for units 1 and 2

U2 250 19-04-17 19-04-20 5th PSS

(NLC & TN JV)NTPL U1 & U2 U1 500 24-05-17 24-05-20 5th PSS

8th PSS: NTPL informed that PSS tuning is planned to be carried out by July 2021

U2 500 02-08-17 02-08-20 6th PSS

8th PSS: NTPL informed that PSS tuning is planned to be carried out by July 2021

NNTPS

U1 500

8th PSS: NNTPS informed that PSS tuning is planned to be carried out by July 2021

U2 500

8th PSS: NNTPS informed that PSS tuning is planned to be carried out by July 2021

NPCIL, KGS U1 to U4

U1 220 22-02-19 22-02-22 7th PSS

The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided along with damping torque calculation SRT should be carried out at a) >80% loading and b) between 50% to 80% loading range preferably at lower load in the future


U2 220 12-03-17 12-03-20 6th PSS

8th PSS: KGS informed that PSS tuning/SRT will be planned after Unit 2 is revived from S/D. SRT may also be done at a higher step in the future. The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided along with damping torque calculation Loading of the m/c at which SRT was carried out is to be furnished.

U3 220

8th PSS

Report submitted for analysis

U4 220 19-01-20 19-01-23

8th PSS

8th PSS: Both channels to be tested while PSS tuning is carried out. Channel changeover test also to be done. PSS model, Damping torque calculation to be furnished.

NPCIL, MAPS U1 & U2

U1 220 11-01-06 11-01-09

8th PSS: MAPS informed that presently the unit is in project mode. PSS tuning/SRT will be done during startup.

U2 220 20-11-18 20-11-21 7th PSS

8th PSS:Remaining PSS OFF plots to be furnished for comparison The reasons for oscillations in active power may be furnished The Generator, Exciter, Governor and Stabilizer Model along with final settings to be provided along with damping torque calculation

NPCIL, KKNPP U1 1000 22-05-19 22-05-22 7th PSS SRT analysed

U2 1000 20-03-20 20-03-23

8th PSS

8th PSS: KKNPP to clarify on: 1. H value 2. The Generator datasheet, Exciter type, Governor and PSS Model to be furnished


ISTS Connected IPPs


be tuned by

Analyzed during


SEIL P-I U1 660 23-12-16 23-12-19 4th PSS SRT analyzed

U2 660 30-11-17 30-11-20 6th PSS The damping torque calculation needs to be furnished

SEIL P-II

U1 660 14-06-18

14-06-21

8th PSS

8th PSS: Both channels to be tested while PSS tuning is carried out. Channel changeover test also to be done. PSS model, Damping torque calculation to be furnished. The Generator datasheet, Exciter parameters, PSS Model to be furnished

U2 660 14-06-18

14-06-21

8th PSS

8th PSS: Both channels to be tested while PSS tuning is carried out. Channel changeover test also to be done. PSS model, Damping torque calculation to be furnished. The Generator datasheet, Exciter parameters, PSS Model to be furnished

Coastal Energen U1 600 17-07-18 17-07-21 6th PSS

The damping torque calculation needs to be furnished

U2 600 16-08-16 16-08-19 4th PSS

The PSS output signal was not plotted. Also a higher step change may be considered in the future

IL & FS

U1 600 21-11-19 21-11-22

8th PSS

8th PSS: The Generator data sheet, Exciter parameters along with damping torque calculation to be furnished

U2 600 21-11-19 21-11-22

8th PSS

8th PSS: The Generator data sheet, Exciter parameters along with damping torque calculation to be furnished

Lanco Stage II & III

1*233 + 1*133 +2*371

N

SEL U1 to U4

4 * 150 N

MEL

U1,U2

2 * 150 N

7th PSS: MEL informed vide mail that PSS tuning schedule for the 2 units would be intimated once the units are operational

Analysis and remarks on the test reports in the 8th PSS (20.04.2021) Page 1 of 6

Annexure – II

Analysis and remarks on PSS tuning / SRT reports in the 8th meeting

1. APGENCO -VTPS (Dr. NTTPS)

• Unit Tested : Unit 1 – 5 & 7

• Date of Testing: Between 21-12-2019 and 24-12-2019

• Remarks:

• There is improvement in Damping with PSS In-service and ΔD is greater than

10 for the SRT of all the above tested Units

• Generator, Excitation and PSS Parameters, functional block diagram to be

provided.

2. APGENCO -Srisailam RB HEP

• Units Tested : Unit -1 to 7

• Date of Testing: 06-10-2020

• The PSS Testing is to be done two different loadings of machines and also two

different step %. However at Srisailam all Units SRT is done at one-loading and only

4% step changed

• Remarks:

• There is significant improvement in Damping with PSS In-service for all the

units. The Damping Torque has been calculated and provided and ΔD is in the

range of 8-10.

• The Excitation system and stabilizer parameters along with functional block

diagram to be provide

• Channel Changeover test also to be done

3. APGENCO- Rayalaseema TPS

• Unit Tested :- Unit -4 (210 MW) and Unit- 6 (600 MW)

• Date of Testing: Unit 4: 21-06-2019, Unit 6: 12-12-2018

• PSS Step Response Test is done at

• Unit – 4- 200 MW with 5% step change

• Unit – 6 – 400 MW (60 %) with 4 % step change

S.No Unit Step Change Machine Loading Δ DampingChannel 1 &

Channel - 2

1 1 150 MW & 200 MW

2 2 150 MW & 180 MW

3 3 155 MW & 210 MW

4 4 150 MW & 195 MW Greater than 9

5 5 150 MW & 200 MW Greater than 7.5

6 7 324 MW & 470 MW Greater than 9

4% Yes

Greater than 10


• Remarks:

• Unit – 4:

• The Testing is only at one loading level. Testing at Technical

minimum would prove the PSS performance in the entire operating

range

• With Step down of 5% , there is insufficient response . APGENCO

may kindly explain the reason for this

• The Damping During Positive step with PSS is greater than 10

• Unit – 6:

• The Test to be performed at two different loading of the machine

• Generator, Excitation system and PSS Data to be provided along with

Damping Torque Calculation

• The effectiveness of PSS could not be made with the submitted reports

4. TSGENCO -Kothagudem TPS

• Unit Tested : Unit- 9 (250 MW), Unit-10 (250 MW) and Unit-11 (500 MW)

• Date of Testing: Between 08-01-2020 and 10-01-2020

• Excitation System and PSS Parameters : Not Provided

• PSS Testing with PSS On/OFF and Line Tripping and Closing was done

• There is no improvement in PSS Damping with and without PSS

• Remarks:

• Generator, Excitation and PSS Parameters to be provided

• Testing to be done at two different loading levels and higher Step change in

Field Voltage

• OEM to be consulted for better Damping of Oscillation

5. KAR IPP- JSWEL

• Unit Tested : Unit-4 ( 600 MW)


• Excitation System :- Unitrol 6080 (Static Excitation System) and PSS 2B

• PSS SRT done at 50% and 80% Loading for 4% step change.

• The following Gain have been 3.0, 3.079, 3.2

• Figure 2.6 – Final PSS Ks1 – 3.2 p.u. at 80% Loading is missing

• Remarks:

• PSS Parameters provided

• Generator, Excitation system Functional Diagram and PSS settings to be

provided.

• There is no Damping Calculation


6. TANGEDCO- TTPS

• Unit Tested: Unit-4 ( 210 MW) & Unit-5 ( 210 MW)

• Date of Testing: Unit 4: 31-12-2019, 10-01-2020 and Unit 5: 15.03.2021

Unit-4:

• Excitation System :- Unitrol 6800 (Static Excitation system) and PSS 2A/2B

• PSS SRT done at 208 MW and 150 MW with 2% and 4%

• There is improvement in Damping with PSS In-service.

• Remarks

• The PSS Block Diagram and Parameters have no co-relation

• Generator, Excitation and PSS Parameters, functional block diagram to be

provided

• Damping Torque also to be calculated and submit.

Unit- 5:

• Excitation System : Andritz Hydro Thyne 5 and PSS2A/2B

• The PSS SRT is done for both the channel at

156 MW : 2% , 4% and 210 MW : 2% , 4%

• Remarks

• There is improvement in damping of Oscillation with PSS In-service

• Provided Complete PSS Parameters and Block Diagram

• The following to be submitted

• Excitation Block Diagram

• Damping Torque Calculation

• Generator datasheet

7. TANGEDCO -MTPS

• Unit Tested : Unit- 1 (210 MW) & Unit -2 (210 MW)

• Date of Testing: Unit-1: 08.10.2020 and Unit-2: 08.04.2021

• Excitation System and PSS :

• Unit – 1:- ABB Unitrol 6800 and PSS 2B and Unit – 2 :- Andritz Hydro

Thyne 5 and PSS 2B

• The PSS SRT is done for both the channel at

• Unit – 1 : 150 MW :- 2% , 5% and 210 MW :- 2% , 5% and Unit – 2 :- 140

MW :- 2% , 4% and 180 MW :- 2% , 4%

• Remarks :

• Unit-1:

• There is improvement in damping of Oscillation with PSS In-service

• Provided PSS Parameters Block Diagram and Damping Torque

Calculation(MTPS may explain)

• The following to be submitted

• Generator Parameters

• Excitation system settings and Functional Block Diagram


• Unit – 2:

• From the submitted report effectiveness of PSS Couldn’t be

ascertained

• May explain Damping Torque calculation

• Provide Generator Parameters and Excitation system Data

8. TANGEDCO -NCTPS Stage - I

• Unit Tested : Unit -2 (210 MW) & Unit – 3 (210 MW)


• Excitation System :- Static Excitation Andritz hydro Thyne 5 and PSS2B

• The following SRT is conducted

• Unit – 2 :- 140 MW – 2% , 5% and 180 MW 2% , 5%

• Unit – 3 :- 140 MW – 2% , 5% and 185 MW 2% , 5%

• Remarks:

• There is improvement in Damping with PSS In-service

• NCTPS have provided Generator, Excitation system and PSS Parameters and

Damping Torque Calculation.

CGS/ISGS

9. NTPC Simhadri STPS

• Unit Tested : 1,2,3 and 4 (500 MW each) ( total 4 units)

• Date of Testing: Units 1,2,4 : 04-12-2019; Unit - 3: 05-12-2019

• SRT for each unit done at only 1 loading of the machine and 2% Step change

• Remarks:

• There is no difference in Damping of the Real-Power

• Machine Details not provided

• Tests to be done at two different loading of machine in both the channel

• Sufficient Time Delay for Step Change to be done

• Damping Torque to be calculated

10. NPCIL-KKNPP

• Unit Tested – Unit -2 (1000 MW)


• Excitation System and PSS Model:- AVR – M Excitation system and PSS used -

Frequency Deviation, Rate of change of Frequency, Field current , and Generator

Voltage derivative

• PSS Step Response Test is done at 500 MW and 840 MW with 3% Step Change

• The PSS SRT for different gains have been done and finally implemented for K0F = 3

, K1F = 1.5, K1If = 1.5 and K1U – 2.0


• Remarks:

• PSS is efficiently damping electro – mechanical oscillation at both the power

levels

• KKNPP may kindly tell whether it is brushless or static excitation system,

Generator Datasheet and Equivalent IEEE Model Excitation, PSS and

Governor maybe told.

• The Damping Torque is increased in the range of 10 – 30

• H = 0.56 , to clarify

11. NPCIL- KAIGA GS

• Units Tested : Unit -4 (220MW)


• Excitation System : IEEE Type 2 UNITROL 5000 ( Static Excitation system)

• The PSS Testing is done at two different loadings of machines and also two different

step %.

• 195 MW(80 %) and ±3 %

• 126 MW (50 %) and ±5 %

• There is significant improvement in Damping with PSS In-service

• Remarks:

• The Test has to be done in both the channel and Channel Changeover test also

to be done. This may be done for all the future testing at Kaiga

• Functional Block Diagram of Model maybe submitted

• Damping Torque Improvement to be submitted

ISTS connected IPPs

12. SEIL P - II

• Units Tested : Unit -1 & 2


• Excitation System : IEEE Type 2 UNITROL 6800 ( Static Excitation system), PSS2B

Stabilizer Model.

• The PSS Testing is done at two different loadings of machines and also two different

step %.

• 330 MW(80 %) and ±2 %, ±3 %, ±4 %

• 530 MW (50 %) and ±3 % & ±4 %

• Different Gain settings have been checked for finding out the best settings with Ks1 =

0.8 , 1.4, 1.8 and 1.923 and final implemented 1.8

• With PSS In-service there is improvement in Damping

• Remarks:

• The Test has to be done in both the channel and Channel Changeover test also

to be done. This may be done for all the future testing


• Generator Datasheet, Excitation system parameters and functional block

diagram not provided

• Damping Torque Calculation to be submitted

13. IL & FS TPL

• Unit Tested : Unit -1 & Unit – 2


• Excitation System : ABB, Unitrol 6800 (static Excitation system) and PSS2B

• The following tests are conducted in both the channel

• Unit – 1 : - ±1% Step, ±2% Step, ±3% Step at 550 (91%) MW with &

Without PSS

• Unit – 2 :- ±1% Step, ±2% Step, ±3% Step at 540 (90%) MW with & Without

PSS

• Remarks:

• Stabilizer Data provided, However excitation system parameters and

Generator Data sheet to be provided

• There is improvement in Damping with PSS In-service

• Damping Torque calculation provided

****

Page 1 of 4

Status of PSS Tuning/SRT of generating Units in SR (as on 30.04.2021) Entity Station/Unit Completed (Unit/Date) Next Tuning by

APGENCO

Rayalaseema TPS

(5x210 MW)

Unit-1(13.01.2016) 12.12.2018 12.12.2021

Unit-2 13.01.2016 13.01.2019

Unit-3 13.01.2016 13.01.2019

Unit-4 (13.01.2016) 21.06.2019 21.06.2022

Unit-5 13.01.2016 13.01.2019

Vijayawada TPS

(NTTPS)

(6x210 MW+1x500MW)

Unit-1 (01.04.2016) 24.12.2019 24.12.2022

Unit-2 01.04.2016 01.04.2019

Unit-3 01.04.2016 01.04.2019

Unit-4 01.04.2016 01.04.2019

Unit-5 (27.12.2018) 24.12.2019 24.12.2022

Unit-6 11.02.2019 11.02.2022

Unit-7 (01.04.2016) 24.12.2019 24.12.2022

SDSPP (Krishnapatnam JV) (2x800 MW)

Unit-1 12.04.2018 12.04.2021

Unit-2 13.04.2018 13.04.2021

Lower Sileru HEP (4x115 MW)

Unit-1 13.12.2016 13.12.2019

Unit- 2 to 4 Under RLA study

Srisailam RB HEP (7x110 MW)

Unit-1 29.09.2016 29.09.2019

Unit-2 29.09.2016 29.09.2019

Unit-3 28.09.2016 28.09.2019

Unit-4 29.09.2016 29.09.2019

Unit-5 30.09.2016 30.09.2019

Unit-6 01.10.2016 01.10.2019

Unit-7 30.09.2016 30.09.2019

AP-IPPs HNPCL (2x520 MW)

Unit-1 28.03.2017 28.03.2020

Unit-2 27.03.2017 27.03.2020

KPCL

Raichur TPS (7x210 MW+ 1x 250 MW)

Unit-1 18.06.2016 18.06.2019

Unit-2 22.08.2016 22.08.2019

Unit-3 17.06.2016 17.06.2019

Unit-4 06.09.2017 06.09.2020

Unit-5 (24.11.2015) 14.03.2019 14.03.2022

Unit-6 (17.12.2015) 15.03.2019 15.03.2022

Unit-7 (17.12.2015) 02.08.2019 02.08.2022

Unit-8 (19.11.2015) 15.03.2019 15.03.2022

BTPS (2x500 MW+1x700MW)

Unit-1 (15.10.2015) 18.08.2017

24.11.2020 24.11.2023

Unit-2 (31.12.2015) 25.11.2020 25.11.2023

Unit-3 (26.08.2016) 02.04.2021 02.04.2024

Yeramarus TPS (2x800MW)

Unit-1

Unit-2

Varahi UGPH (4x115 MW)

Unit-1 (23.10.2016) 17.10.2019 17.10.2022

Unit-2 (23.10.2016) 17.10.2019 17.10.2022

Unit-3 (24.07.2017) 18.10.2019 18.10.2022

Unit-4 (23.10.2016) 18.10.2019 18.10.2022

Nagjheri HEP (5x150 MW+1x135MW)

Unit-1 4/5.01.2017 05.01.2020

Unit-2 4/5.01.2017 05.01.2020

Unit-3 (02.06.2016) 13.03.2020 13.03.2023

Unit-4 4/5.01.2017 05.01.2020

Unit-5 4/5.01.2017 05.01.2020

Unit-6 17.08.2017 17.08.2020

Page 2 of 4

Sharavathy HEP (10x103.5 MW)

Unit-1(7/8.06.2017) 05.04.2021 05.04.2024

Unit-2(7/8.06.2017) 03.04.2021 03.04.2024

Unit-3 (12.11.2016) 23.10.2019 23.10.2022

Unit-4(7/8.06.2017) 05.04.2021 05.04.2024

Unit-5 (11.11.2016) 06.11.2019

07.04.2021

07.04.2024

Unit-6 7/8.06.2017 08.06.2020

Unit-7 (10.11.2016) 23.10.2019 23.10.2022

Unit-8 (13.12.2017) 05.04.2021 05.04.2024

Unit-9 (11.11.2016) 31.10.2019 31.10.2022 Unit-10(11.11.2016) 07.11.2019 07.11.2022

KAR-IPPs

UPCL (2x600 MW)

Unit-1 04.10.2015 04.10.2018

Unit-2 23.10.2015 23.10.2018

JSWEL (4x300 MW)

Unit-1 15.02.2017 15.02.2020

Unit-2 21.10.2019 21.10.2022

Unit-3 21.10.2019 21.10.2022

Unit-4 26.09.2018 26.09.2021

KSEBL Idukki HEP (6x130MW)

Unit-1

After RMU

works

Unit-2

Unit-3

Unit-4

Unit-5

Unit-6

TANGEDCO

NCTPS Stage-1 (3x210 MW)

Unit-1 01.04.2018 01.04.2021

Unit-2(05.04.2017) 29.01.2021 29.01.2024

Unit-3(06.04.2017) 29.01.2021 29.01.2024

NCTPS Stage-1I (2x600 MW)

Unit-1 31.08.2017 31.08.2020

Unit-2 30.08.2017 30.08.2020

Tuticorin TPS (5x210MW)

Unit-1 03.02.2018 03.02.2021

Unit-2 12.11.2019 12.11.2022

Unit-3 27.07.2019 27.07.2022

Unit-4(28.12.2016) 10.01.2020 10.01.2023

Unit-5 (29.12.2016) 15.03.2021 15.03.2024

Mettur TPS Stage-I (4x210 MW)

Unit-1 (09.10.2017) 08.10.2020 08.10.2023

Unit-2 (22.07.2017) 08.04.2021 08.04.2024

Unit-3 07.09.2016 07.09.2019

Unit-4 (09.10.2015) 09.11.2019 09.11.2022

Mettur TPS Stage-III (1x600 MW)

Unit-1 10.08.2017 10.08.2020

Kadamparai HEP (4x100 MW)

Unit-1 09.10.2017 09.10.2020

Unit-2 22.07.2017 22.07.2020

Unit-3 12.11.2019 12.11.2022

Unit-4 09.11.2019 09.11.2022

TN -IPP STCMS (1x250 MW) Unit-1 No information available

TSGENCO

Kakatiya TPS (1x500 MW + 1x 600 MW)

Unit-1(24.01.2016) 27.02.2019 27.02.2022

Unit-2 (06.07.2016) 27.02.2019 27.02.2022

Kothagudem TPS U7 to U12 (2x120 MW+ 2x250MW+ 1x500MW+1x800MW)

Unit-7 01.03.2018 01.03.2021

Unit-8 26.01.2018 26.01.2021

Unit-9 22.12.2015 22.12.2018

Unit-10 22.12.2015 22.12.2018

Unit-11 22.12.2015 22.12.2018

Unit-12

Page 3 of 4

Nagarjunasagar HEP (7x110 MW+1x100.8 MW)

Unit-1 04.03.2017 04.03.2020

Unit-2 08.01.2017 08.01.2020

Unit-3 08.01.2017 08.01.2020

Unit-4 08.01.2017 08.01.2020

Unit-5 08.01.2017 08.01.2020

Unit-6 08.01.2017 08.01.2020

Unit-7 08.01.2017 08.01.2020

Unit-8 08.01.2017 08.01.2020

Srisailam LB (6x150 MW)

Unit-1 (20.01.2017) 06.10.2020 06.10.2023

Unit-2 (23.01.2017) 06.10.2020 06.10.2023

Unit-3 (21.01.2017) 06.10.2020 06.10.2023

Unit-4 (19.01.2017) 06.10.2020 06.10.2023

Unit-5 (22.01.2017) 06.10.2020 06.10.2023

Unit-6 (21.01.2017) 06.10.2020 06.10.2023

SCCL Singareni TPS (2x600 MW)

Unit-1 30.10.2017 30.10.2020

Unit-2 30.10.2017 30.10.2020

NTPC

RSTPS Stage-I,II & III (3x200MW+3x500MW)

Unit-1 June 2021

Unit-2 August 2020

Unit-3 01.05.2017 01.05.2020

Unit-4 21.02.2018 21.02.2021

Unit-5 28.11.2018 28.11.2021

Unit-6 28.11.2018 28.11.2021

Unit-7 19.10.2016 19.10.2019

Simhadri STPS Stage –I & II (4x500 MW)

Unit-1(14.03.2016) 04.12.2019 04.12.2022

Unit-2(18.03.2016) 04.12.2019 04.12.2022

Unit-3(18.03.2016) 05.12.2019 05.12.2022

Unit-4(18.03.2016) 04.12.2019 04.12.2022

Talcher STPS Stage-II U3 to 6 (4x500 MW)

Unit-3 (04.06.2016) 04.06.2019 04.06.2022

Unit-4 2020

Unit-5 2020

Unit-6 (04.06.2016) 04.06.2019 04.06.2022

Kudgi STPS Stage-I (3x800 MW)

Unit-1 10.09.2016 10.09.2019

Unit-2 02.11.2017 02.11.2020

Unit-3 29.04.2018 29.04.2021

NTECL Vallur STPS (3x500 MW)

Unit-1 (09.11.2016) 10.09.2019 10.09.2022

Unit-2 08.11.2016 08.11.2019

Unit-3 07.11.2016 07.11.2019

NLCIL

TPS-II Stage-I&II (7x210 MW)

Unit-1 19.04.2017 19.04.2020

Unit-2 19.04.2017 19.04.2020

Unit-3 19.04.2017 19.04.2020

Unit-4 23.12.2016 23.12.2019

Unit-5 23.12.2016 23.12.2019

Unit-6 23.12.2016 23.12.2019

Unit-7 23.12.2016 23.12.2019 TPS-I Expn. (2x210 MW)

Unit-1 12.10.2015 December 2020

Unit-2 05.11.2015 December 2020

TPS-II Expn. (2x250 MW)

Unit-1 19.04.2017 19.04.2020

Unit-2 19.04.2017 19.04.2020

NNTPS (2x500 MW)

Unit-1 July 2021

Unit-2 July 2021

NTPL NLC&TN JV (2x500 MW)

Unit-1 24.05.2017 24.05.2020

Unit-2 02.08.2017 02.08.2020

Page 4 of 4

NPCIL

MAPS (2x220 MW)

Unit-1 11.01.2006 After revival

Unit-2(03.08.2003) 20.11.2019 20.11.2022

KGS (4x220 MW)

Unit-1 22.09.2019 22.09.2022

Unit-2 12.03.2017 12.03.2020

Unit-3 19.04.2007 19.04.2010

Unit-4 (25.11.2017) 19.01.2020 19.01.2023

KKNPP (2x1000 MW)

Unit-1(01.02.2016) 22.05.2019 22.05.2022

Unit-2 (21.02.2017) 20.03.2020 20.03.2023

ISTS- IPPs

SEIL (TPCIL) (2x660 MW)

Unit-1 24.12.2016 24.12.2019

Unit-2 01.12.2017 01.12.2020

CEPL (2x600 MW)

Unit-1 17.07.2018 17.07.2021

Unit-2 16.08.2016 16.08.2019

ITPCL (2x600 MW)

Unit-1 (12.04.2015) 21.11.2019 21.11.2022

Unit-2 (14.04.2016) 10.12.2018

21.11.2019

21.11.2022

Total- 165Units

Note: Retuning at least once in three years.

****

Appendix

Sl.No Name Designation Organization Email address Mobile Number

1 D.Venkata ramana Rao SO/G MAPS/NPCIL [email protected] 9445397502

2 KODANDA PANI VUDUGUNDLA EE APGENCO/VS/VJA [email protected] 9493121742

3 Siva Prasad EE EM,NTTPS, APGENCO [email protected]

4 M SREEKANTH AEE APGENCO/SRBPH [email protected] 9490130728

5 G LAXMI PRASAD ADE TSGENCO/THERMAL [email protected] 9493122182

6 V SHOBHAN BABU ADE TSGENCO/HYDEL [email protected] 9493174385

7 T BRAHMAM ADE KTPS-VI/TSGENCO [email protected] 9493122680

8 MANOHAR ADE KTPS-V/TSGENCO [email protected] 9493120633

9 M CHANDRA SHEKAR AE KTPS-VI/TSGENCO [email protected] 7382612818

10 BHARGAV NARAYANA AE KTPS-V/TSGENCO [email protected] 7382612807

11 K VASU ADE KTPP/TSGENCO [email protected] 9493123137

12 SRIKANTH AE KTPP/TSGENCO [email protected] 7382632671

13 D K Gouamma CE(E) KPCL/CEED [email protected] 9448182040

14 Srinivas Shenoy SE(E) KPCL/CEED [email protected] 8867732449

15 K.S. Ranganathan SE(E) KPCL/NPH [email protected] 9449599119

16 GV Srinivasa Murthy EE(E) KPCL/CEED [email protected] 9449192240

17 Muruli Krishna KC EE(E) KPCL/RTPS [email protected] 9449596538

18 Santhosh Naik EE(E) KPCL/RTPS [email protected] 9449596534

19 Channabasavaraju EE(E) KPCL/CETD [email protected] 9481547035

20 Rajashekar AEE(E) KPCL/YTPS 9620174539

21 B. Rajendra Kumar AGM NTPC-SRHQ [email protected] 9440918111

22 KAMARAJ R N DGM/EM NTPL [email protected]

23 R Mohan NTECL VALLUR [email protected]

24 S P Kumar CGM SRLDC/POSOCO [email protected] 9449599163

25 Madhukar G DGM SRLDC/POSOCO [email protected] 9449599194

26 Sharth Chand Manager SRLDC/POSOCO [email protected]

27 A.Balan Member Secretary SRPC [email protected]

28 K P Madhu SE SRPC [email protected]

29 A Kesavan EE SRPC [email protected] 9739553085

30 Malini N.S EE SRPC [email protected] 9845545123

31 Sriharsha M AEE SRPC [email protected] 9618311481

List of Participants for 8th PSS tuning Meeting held on 20.04.2021

http://ce.hpc2tsgenco.co/

http://ce.hpc2tsgenco.co/

mailto:[email protected]







Documents

Subject: Record Notes of the 8th Meeting on PSS Tuning of