impact of voltage dip

8/7/2019 impact of voltage dip

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PRESENTED BYPRESENTED BYRAMESHRAMESH

KUMAR SINHAKUMAR SINHA

RITESH KUMARRITESH KUMAR

RIBHU KUMARRIBHU KUMAR



DISTRIBUTED GENERATOR IMPROVE

POWER QUALITY,PROTECTION AND

RELIABILITY.

RECENTLY IT DOMINATES AROUND 16% OFTOTAL POWER GENERATION

STUDIES SHOWN WITHIN 2-3 YEARS ,WILL

INCREASES TO 30%.

NEGATIVE IMPACT LIKE FAULT CLEARING,RECLOSING AND INTERFERENCE WITH

RELAYING.



Decrease in RMS voltage at the power frequency for

durations from 0.5 cycles to 1 minute.

VOLTAGE DIP

voltage dip of 40% equates to voltage sag of 60%.



Analysis of voltage profile in islanding operation, IEEE

13 test feeder is simulated using PSCAD/EMTDC. Provide RRL type 3-phase voltage source to bus-1 -

slack bus, substation rated as 10MVA, 11KV isconnected to system to 33/11KV step down T/F andagain 11/6.6KV.

DG connected to bus-13 and fault connected to bus-11as shown in figure.

Using synchronous and induction machine, the voltagesag is analyzed.

Comparative study between synchronous and inductionmachine with and without DG is analyzed here.







The quality of power and the ease of operation due to

mature manufacturing technology makes synchronousgenerator dominant over other type of DG.

Two different mode of controlling;1.One aims to maintain constant the terminal voltage2.Other aims to maintain constant the power factor. The rated RMS line to neutral voltage is taken as

10.392KV and the rated RMS line current is taken as35.283kA



WITHOUT FAULT CONDITION WITH FAULT CONDITION

0

0.2

0.4

0.6

0.8

1

1.2

v8 v9 v10 v11 v12 v13 v14

Without DG

With SG

With IG

0

0.2

0.4

0.6

0.8

1

1.2

v8 v9 v10 v11 v12 v13 v14

Without DG

With SG

With IG



Fault is not connected to any bus

Graphs shows that magnitude of voltage is high incase of synchronous than induction generator.

WITH FAULT CONDITION

During fault condition , when DG is connected

, than magnitude of voltage profile is increased incase of synchronous DG than induction DG.



0

0.2

0.4

0.6

0.8

1

1.2

0 1 2 3 4 5

Without DG

Synchronous

Induction

0

0.2

0.4

0.6

0.8

1

1.2

0 1 2 3 4 5

without DG

Synchronous

Induction



1-PHASE FAULT

Voltage sag is more found in induction generator

during time period 1-2 second.

In case of synchronous generator voltage profile is

improved.2-PHASE FAULT

Voltage sag is somewhere more in induction

generator than the synchronous generator during

the time period of 1-2 second.



Voltage sag is more in induction generator during

the time 1-2 seconds.





Voltage profile improved much higher in case of

synchronous generator than induction.

Voltage of 1st phase,2nd phase and 3rd phase fault

is analyzed here. Voltage sag increases is adjusted by increasing

the size of DG.

But in term of financial condition , induction

generator is better.



UNDER THE EXCELLENT GUIDANCE OFUNDER THE EXCELLENT GUIDANCE OF

MR.L.RAMESH

MS. M.VENMATHI





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impact of voltage dip