Upload
others
View
7
Download
0
Embed Size (px)
Citation preview
Synchro Phasor Monitoring System
Ray Doyle
Generator Forum 15th May
Presentation Content
• Update on status of SPM system
• Use of SPM system during North-South Separation
• Use of system during Storm Darwin
• Use of SPM to observe generator behaviour during
Testing
• Recent Power System Events of Concern
SPM System Status Update
• 19 PMU’s now operational – 14 in Ireland
– 4 in Northern Island (Coolkeeragh * 2, Moyle & Castlereagh House)
– 1 in UK on East West Interconnector
– Additional Units planned for NI
• Additional recorders installed in Ireland with PMU
capability will be connected to the SPM system as
bandwidth required to stream data becomes available
• Real Time Phasor Data now available to NCC and will be
available to CHCC in near future
–
System Frequency Measurements
Frequency Spectrum Analyser
Generator Stability Status
Control Centre Frequency Oscillation Monitoring Display
Oscillation Magnitude (MW) & Frequency
North-South system Separation 28th Nov 2013
Forced Outage of Louth-Tandragee 275 kV Interconnector
49.9
49.92
49.94
49.96
49.98
50
50.02
50.04
50.06
50.08
28
-11
-13
08
:40
:00
28
-11
-13
08
:41
:00
28
-11
-13
08
:42
:00
28
-11
-13
08
:43
:00
28
-11
-13
08
:44
:00
28
-11
-13
08
:45
:00
28
-11
-13
08
:46
:00
28
-11
-13
08
:47
:00
28
-11
-13
08
:48
:00
28
-11
-13
08
:49
:00
28
-11
-13
08
:50
:00
28
-11
-13
08
:51
:00
28
-11
-13
08
:52
:00
28
-11
-13
08
:53
:00
28
-11
-13
08
:54
:00
28
-11
-13
08
:55
:00
28
-11
-13
08
:56
:00
28
-11
-13
08
:57
:00
28
-11
-13
08
:58
:00
28
-11
-13
08
:59
:00
28
-11
-13
09
:00
:00
28
-11
-13
09
:01
:00
28
-11
-13
09
:02
:00
28
-11
-13
09
:03
:00
28
-11
-13
09
:04
:00
28
-11
-13
09
:05
:00
28
-11
-13
09
:06
:00
28
-11
-13
09
:07
:00
28
-11
-13
09
:08
:00
28
-11
-13
09
:09
:00
28
-11
-13
09
:10
:00
Fre
qu
en
cy (
Hz)
System Frequencies pre/post System Separation
South
North
Moment of Separation
North-South Re-Synchronisation 30th Nov 2013
49.94
49.95
49.96
49.97
49.98
49.99
50
50.01
50.02
50.03
50.04
50.05
30
-11
-13
08
:30
:00
30
-11
-13
08
:31
:00
30
-11
-13
08
:32
:00
30
-11
-13
08
:33
:00
30
-11
-13
08
:34
:00
30
-11
-13
08
:35
:00
30
-11
-13
08
:36
:00
30
-11
-13
08
:37
:00
30
-11
-13
08
:38
:00
30
-11
-13
08
:39
:00
30
-11
-13
08
:40
:00
30
-11
-13
08
:41
:00
30
-11
-13
08
:42
:00
30
-11
-13
08
:43
:00
30
-11
-13
08
:44
:00
30
-11
-13
08
:45
:00
30
-11
-13
08
:46
:00
30
-11
-13
08
:47
:00
30
-11
-13
08
:48
:00
30
-11
-13
08
:49
:00
30
-11
-13
08
:50
:00
30
-11
-13
08
:51
:00
30
-11
-13
08
:52
:00
30
-11
-13
08
:53
:00
30
-11
-13
08
:54
:00
30
-11
-13
08
:55
:00
30
-11
-13
08
:56
:00
30
-11
-13
08
:57
:00
30
-11
-13
08
:58
:00
30
-11
-13
08
:59
:00
30
-11
-13
09
:00
:00
Fre
qu
en
cy (
Hz)
System Frequencies during System Re-synchronisation
South
North
Matching of System Frequencies Moment of Re-Synchronisation
North-South Re-Synchronisation 30th Nov 2013
-300
-250
-200
-150
-100
-50
0
50
Ph
ase
An
gle
(d
egr
ee
s)
Voltage Phase Angles during System Re-synchronisation
South
North
Matching of System Angles Moment of Re-Synchronisation
The Synchro-phasor Monitoring System
Provides Control Centre With
• Immediate Identification of System Splits – Information of the state of each sub system
– Means to direct efforts when re-synchronising two parts of the system
• Generator MW & MVAr output
• Bus Voltages / Frequencies / Phase angles
• Oscillation magnitudes and frequencies
• Indication of Faults, Fault Types and Durations
• Partial Backup for Scada/EMS failure
Use of Phasor Monitoring system
during Storm Darwin 12th February
• 67 faults on 110 kV System from 11:36 to 16:21 – Seven 110 kV load stations disconnected
– Three 110 kV wind farms disconnected
• Eight lines forced out of service at end of storm
• All generators rode through all faults
Voltage Dips Across the Network
11:30 to 15:30
Impact at various networks nodes
available to operators seconds after fault
Line Trip, Auto-Reclose & Trip 1 Ph to E fault, line structure okay, attempt restoration
1 s per division
Line Trip, Auto-Reclose & Trip Ph to Ph fault , possible structural damage, no restoration attempt
~ 0.5s per division
Fault evolving from 1 to 2 to 3 phase (suggest structure failure thus no attempt to restore)
Use of Phasor Monitoring system
during Storm Darwin 12th February
• SPM system can provide detailed fault
information to control centre in real time
• This supplements existing information such as
Protection relay signals
• New information is graphical thus faster and
easier to interpret – In many instances can reduce decision making time
Use of SPM to observe generator
behaviour during Testing
• The SPM now allows observation of generator testing in
real time – Any issues the machine is causing for the system or other generators can be observed
• Should allow for more secure operation of the system
when tests with significant impact potential are being
carried out
• Allows decisions to be made on continuing with test
programme or pausing to investigate issues
Example of Setpoint Step Change to AVR
238.9
kV L-L
-24.6
MVAr
17:19 17:18 17:17 17:13 17:12 17:11
12/03/2014 17:20:00Measured Voltage and Reactive Power
237.8
238.0
238.2
238.4
238.6
238.8
239.0
239.2
-44.0
-41.1
-38.3
-35.4
-32.6
-29.7
-26.9
-24.0
Reaction of Generator MVAr output to Disturbance
introduced by Transformer Switching
234.2
kV L-L
-74.7
MVAr
20:44 20:43 20:42 20:38 20:37 20:36
12/03/2014 20:45:00Measured Voltage and Reactive Power
222.0
224.0
226.0
228.0
230.0
232.0
234.0
236.0
-90.0
-77.1
-64.3
-51.4
-38.6
-25.7
-12.9
0.0
Reaction of Generator MW Output Disturbance
introduced by Transformer Switching
E.Freq;Hz
50.010
Hz
E.3P;MW
429.2
MW
20:40:06 20:40:04
12/03/2014 20:40:07Local Frequency and Real Power
49.960
49.970
49.980
49.990
50.000
50.010
50.020
50.030
380.0
397.1
414.3
431.4
448.6
465.7
482.9
500.0
Recent Incidents
• Two Major Incidents currently under Investigation
– 22nd April Under-frequency Load Shedding
following generator trip
– 27th April Major System Oscillation following
generator trip
System Frequency 22 April 2014 17:31 to 17:46
• 370 MW Gen Trip
• 180 MW load disconnected approx
• Frequency sub 49.9 Hz ~ 9 min
Comparison Event
• 357 MW Trip 27 May 2013
• Frequency recovered to 49.9 Hz ~ 9 seconds post Nadir
System Frequency 27 April 2014 21:40
• 370 MW Trip 27 April 2014
• Severe Oscillation in generator outputs around Nadir
20s per division
Frequency & Voltage Oscillations
Looking Ahead
• Trend is to have fewer conventional units
committed than in the past
• No Margin for underperformance of any unit – In terms of reserve provision, stability, fault ride through, voltage support
• EirGrid & Generators to Collaborate on – More robust testing of machine capability and dynamic performance
– Enhanced Performance Monitoring
– Linking payments to actual performance with the potential for declaring
services unavailable following evidence of under performance
– Incentives to deliver the required performance
Thanks for your Attention
Questions