1 SOUTHERN REGIONAL POWER COMMITTEE BANGALORE MINUTES OF THE SPECIAL MEETING ON RGMO/MVAR HELD AT SRPC BENGALURU ON 30 th SEPTEMBER 2015 1. INTRODUCTION A Special Meeting on RGMO performance & MVAR Interchange of SR Generators was held at Bangalore on 30 th September 2015.The list of participants is at Annexure-I. Shri S.R. Bhat, Member Secretary, SRPC extended a warm welcome to the participants to the Special Meeting. He informed that the last Meeting on RGMO/MVAR had been held in August 2014 and this was the 7 th Meeting in this regard. He said that in the June 2014 Meeting, CERC staff had also participated and given valuable inputs. Hon’ble CERC had constituted a Committee to look into various aspects of RGMO/FGMO implementation. He informed that the 27 th TCC/28 th SRPC Meetings were scheduled for 9 th & 10 th October 2015 and it would be apt to assess the RGMO/MVAR performance in this Meeting which would enable proper briefing to the higher forum. It was noted with concern that there was no representation from TNSDLC, Kaiga GS & UPCL. 2. RGMO/FGMO WITH MANUAL INTERVENTION It was noted that the following instances had been posted in the web group for RGMO/FGMO with MI analysis: MONTH DATE TIME TYPE Apr-15 07-04-15 21:01 Dip in Frequency 25-04-15 11:41 Rise in Frequency 26-04-15 12:41 Rise in Frequency May-15 26-05-15 17:55 Rise in Frequency Jun-15 26-06-15 19:13 Dip in Frequency Jul-15 28-07-15 11:52 Dip in Frequency Aug-15 19-08-15 02:33 Dip in Frequency Sep-15 04-09-15 19:24 Dip in Frequency
212
Embed
SOUTHERN REGIONAL POWER COMMITTEE · PDF fileRGMO/FGMO with MI & MVAR Interchange Meeting held on 30.09.2015 Page 5 committed date was already over. TPCIL stated that they would...
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
SOUTHERN REGIONAL POWER COMMITTEE BANGALORE
MINUTES OF THE SPECIAL MEETING ON RGMO/MVAR HELD AT SRPC
BENGALURU ON 30th SEPTEMBER 2015
1. INTRODUCTION
A Special Meeting on RGMO performance & MVAR Interchange of SR
Generators was held at Bangalore on 30th September 2015.The list of
participants is at Annexure-I.
Shri S.R. Bhat, Member Secretary, SRPC extended a warm welcome to the
participants to the Special Meeting. He informed that the last Meeting on
RGMO/MVAR had been held in August 2014 and this was the 7th Meeting in
this regard. He said that in the June 2014 Meeting, CERC staff had also
participated and given valuable inputs. Hon’ble CERC had constituted a
Committee to look into various aspects of RGMO/FGMO implementation. He
informed that the 27th TCC/28th SRPC Meetings were scheduled for 9th & 10th
October 2015 and it would be apt to assess the RGMO/MVAR performance in
this Meeting which would enable proper briefing to the higher forum.
It was noted with concern that there was no representation from TNSDLC,
Kaiga GS & UPCL.
2. RGMO/FGMO WITH MANUAL INTERVENTION
It was noted that the following instances had been posted in the web group for
RGMO/FGMO with MI analysis:
MONTH DATE TIME TYPE
Apr-15
07-04-15 21:01 Dip in Frequency
25-04-15 11:41 Rise in Frequency
26-04-15 12:41 Rise in Frequency
May-15 26-05-15 17:55 Rise in Frequency
Jun-15 26-06-15 19:13 Dip in Frequency
Jul-15 28-07-15 11:52 Dip in Frequency
Aug-15 19-08-15 02:33 Dip in Frequency
Sep-15 04-09-15 19:24 Dip in Frequency
RGMO/FGMO with MI & MVAR Interchange Meeting held on 30.09.2015 Page 2
SRLDC presented the performance of various generators and the presentation is at
Annexure- II. NCTPS, TANGEDCO made a presentation (Annexure- III) on the
status and issues regarding RGMO.
Following was the response of the constituents in each incident.
Instance on 07.04.15
HYDRO THERMAL TOTAL
Possible Actual % Possible Actual % Possible Actual %
AP 15.62 0.67 4.29 154.81 36.64 23.67 170.43 37.31 21.89
TG 0 0 66.7 14.71 22.05 66.7 14.71 22.05
KAR 118.5 34.14 28.81 200.72 11.6 5.78 319.22 45.74 14.33
SR 145.99 83.25 57.0245 735.45 96.3248 13.0974 881.44 179.575 20.37
Summary of Deliberations:
Status of RGMO in new units: On a query NLC informed that RGMO for TS-II Expansion Units was not in
service for both the units due to technical reasons/partial loading. NLC informed that issue would be rectified and RGMO would be put in service within 15 days. SRLDC expressed grave concern that the removal of RGMO had not been intimated.
On a query NTPL informed that RGMO was not in service due to some teething issues and the issues were likely to be rectified before October 2015. RGMO would be put in service before October 2015. SRLDC stated that the generators were taking out RGMO but there was no intimation to SRLDC which was violation of IEGC provisions.
It was noted that TPCIL had committed that they would put the RGMO in service for Unit-I (RGMO was in place for Unit-II) within 15 days and the
RGMO/FGMO with MI & MVAR Interchange Meeting held on 30.09.2015 Page 5
committed date was already over. TPCIL stated that they would implement the RGMO logic during the next shut down. SRLDC/SRPC expressed that TPCIL was not putting RGMO though committed which was a matter of serious concern. SRLDC stated that they would direct TPCIL to put RGMO in service else they may be forced not to schedule STOA transactions as the Unit was not meeting the statutory requirements for COD declarations as per CEA/CERC Regulations.
On a query APGENCO informed that RGMO features for the Units of Krishnapatnam JV (SDSPP) had been taken out due to hunting. SRLDC stated that APSLDC was responsible to ensure the Regulatory compliance. SRPC/SRLDC stated that the RGMO needs to be put into service at the earliest.
SRLDC/SRPC expressed concern stating that despite regular follow up the MTPS Stage-III unit was not RGMO compliant. TNSLDC/TANGEDCO were suggested to ensure RGMO availability.
SRLDC/SRPC stated that the Coastal Energen Unit-II, NCC Units, IL&FS Unit-II, Hinduja (APSLDC), Kakatiya (TSSLDC), Singareni (TSSLDC), Bellary Unit-III (KPCL/Kar SLDC), Yeramarus (Kar SLDC), Kudgi (NTPC) etc. should come up with RGMO feature. GENCOs/SLDCs to ensure the compliance.
SRLDC stated that the units had not implemented the RGMO (taken out the RGMO due to some technical reasons etc) and thus not meeting the Regulatory compliance of CEA/CERC Regulations. They could therefore be constrained in restricting scheduling, in case RGMO is not put in place for those units.
RGMO Status point extension to SRLDC/SLDC: SRLDC informed that RGMO status point extension was pending for the
following stations:
IL&FS
NTPL IL&FS informed that RGMO status point was made available to SRLDC
and end to end configuration was to be done. NTPL informed that they were following up with PGCIL in this regard and
status would be extended soon. APSLDC informed that the works regarding status point extension from
Krishnapatnam to SLDC were under progress. SRLDC/SRPC suggested that RGMO status points of state units to be
ensured to respective SLDCs and requested the GENCOs/ SLDCs to follow up.
All the generators would validate the settings of RGMO logic to ensure the compliance of the IEGC Regulations.
All the generators would analyze the response with respect to anticipated and carry out root cause analysis and take corrective action for each and every incident.
Data validation between the state generators and the respective SLDCs and the ISGS generators and SRLDC to be continued.
RGMO/FGMO with MI & MVAR Interchange Meeting held on 30.09.2015 Page 6
SRLDC reiterated that DC declaration by generators could be made appropriately to ensure RGMO response. Load Despatch Centers could also schedule appropriately to ensure the response.
It was suggested that the STOAs should not be transacted/permitted by SLDC beyond MCR to ensure that response should be available for grid security. .
Reasons for non performance needed to be qualified with technical justification by the generators.
All technical issues needed to be taken up with OEM to ensure RGMO performance.
APGENCO informed that RGMO was getting triggered at VTPS & RYTPS on multiple instances on daily basis. SRLDC informed that they were analyzing the events through PMU data and there were not many instances which necessitated RGMO triggering. Other constituents also endorsed the SRLDC’s observation. APGENCO was suggested to look into the logic and associated issues.
All the stations should have data logging facility (up to six months) for fruitful analysis/ deliberation.
RGMO should always be in service including at technical minimum.
Intimation on taking out of RGMO needs to be intimated to SRLDC/SLDC along with reasons/revival time.
Parameters would be maintained to ensure RGMO response is available at all instances. .
SLDCs to take proactive role for RGMO implementation/monitoring.
It was noted that individual GENCOs needed to approach through petition to CERC for exemption/extension of RGMO/FGMO compliance.
As per RoP on Petition No.302/MP/2013 all the SLDCs had to furnish the report with details of RGMO/FGMO response of each generating station within their control areas and the details of having taken up the matter with respective SERC in case lack of response or inadequate response from the generating units within their respective states.
SRPC/SRLDC reiterated that SLDCs should take up with their respective State Commissions the lack of response/inadequate response of the generators of their control area.
NTPC stated that the technical difficulties needs to be addressed which would ensure response as mandated in IEGC.
Generators were expected to give response of 5% of the current generation subject to 105% of MCR and analysis was being carried out accordingly.
3.0 MVAR INTERCHANGE
Following are the salient points of the deliberations:
It was noted that Ramagundam STPS, MAPS, NTPL, Kothagudam TPS, Kakatiya TPP, Coastal Energen and UPCL had not furnished the MVAR data despite repeated follow up which was viewed with concern.
RGMO/FGMO with MI & MVAR Interchange Meeting held on 30.09.2015 Page 7
It was also noted that Vijayawada TPS, Rayalaseema TPP, Krishnapatnam , NCTPS Stage-II, JSWEL and LKPPL had not furnished the data in specified format.
SRLDC presentation on MVAR absorption with respect capability curve is at Annexure-IV.
Tap Position Recommendations for ISTS connected generators:
Station Unit Present Tap and
Corresponding
Voltage (in kV)
Recommended Tap
and Corresponding
Voltage(in kV)
Remarks
Kaiga I 1 &2 6 & 229.125 7 & 223.25 KGS to change the
tap position as
recommended
Kaiga II 3&4 3 & 409.5 4 & 399 KGS to change the
tap positions as
recommended
NLC TS-II 3
4, 5, 6 &
7
10 & 237
6 & 415
11 & 235
7 & 410
NLC TS-II
Expansion
1 & 2 5 & 400 5 & 400
NTPL 1 & 2 5 & 400 5 & 400
Thermal
Powertech
1 & 2 5 & 420 7 & 399
Coastal
Energen
1 7 & 399 7 & 399
IL & FS 1 420 400
Tap Position Recommendations for intra-state generators:
APGENCO/APSLDC
Station Unit Present Tap
and
Correspondin
g Voltage (in
kV)
Recommended
Tap and
Corresponding
Voltage(in kV)
Remarks
VTS 1 & 2 3, 4, 5 &6
7
11 & 230 13 & 224 5 & 400
13 & 224 13 & 224 5 & 400
APGENCO informed that the tap of Unit-I & II
RGMO/FGMO with MI & MVAR Interchange Meeting held on 30.09.2015 Page 8
could not be changed as the units were old.
Rayalseema 1,2,3,4&5 13 & 224 13 & 224
Krishnapatnam JV
1 & 2 6 & 409 400
Upper Sileru 1, 3 & 4 2
7 & 226.6 8 & 228.8
220 220
APGENCO informed that tap for Unit-II could not be changed.
IPPs of AP It is recommended that all IPPS under APSLDC could be advised to change their Tap position corresponding to voltage level of 220 kV.
TSGENCO/TSSLDC
Station Unit Present Tap and
Corresponding
Voltage (in kV)
Recommended Tap
and Corresponding
Voltage(in kV)
Remarks
KTS 2, 3 &4 5, 6, 7&8
9 & 10
11 & 225 13 & 228 12& 225
Suggested to come to 220 kV.
TGGENCO informed that they were planning to replace AVR with DVR and there were some issues in changing the taps
11 5 & 400 5 & 400
Nagarjunsa
gar
1
2,3,4,5,6,
7 & 8
9 & 222
7 & 222
10 & 220
8 & 220
KPCL/Kar SLDC
Station Unit Present Tap and
Corresponding
Voltage (in kV)
Recommended Tap
and Corresponding
Voltage(in kV)
Remarks
Bellary TPS
1 4 & 410 5 & 400 KPCL agreed to change the tap
Raichur TPS
4 5 6 7 8
11 & 409 4 & 410 5 & 420 5 & 410
6 & 409.5
400 400 400 400 400
KPCL agreed to change the taps for the units except unit 6. They would rectify the defects during the planned shut down during October 2015
Kadra PH 7 & 225.5 8 & 222.75
RGMO/FGMO with MI & MVAR Interchange Meeting held on 30.09.2015 Page 9
Kodasalli 7 & 225.5 8 & 222.75
Sharavati 9 2 & 231 4 & 220 KPCL informed that tap could not be changed due to technical problems.
UPCL 1 & 2 4 & 409.5 400
JSWEL 1,2, 3 & 4 10 & 412 11 & 400
KSEBL
Station Unit Present Tap and
Corresponding
Voltage (in kV)
Recommended Tap
and Corresponding
Voltage(in kV)
Remarks
Idukki All units 2 & 231 1 & 236.5
Lower Periyar
1
4 & 220
3 & 225.5
Not changed though recommended long back.
Sabarigiri 1,2 & 5 220 225.5 KSEB stated that tap cannot be changed due to technical problems.
TANGEDCO/TNSLDC
Station Unit Present Tap and
Corresponding
Voltage (in kV)
Recommended Tap
and Corresponding
Voltage(in kV)
Remarks
NCTPS
Stage-II
1 9b & 420 13 & 399
Tuticorin TPS
1,2,3,4 & 5
8 & 243
230
Mettur TPS 1,2, 3 & 4 7 & 235.5 7 & 235.5
MTPS St.III 1` TANGEDCO/TNSLDC to confirm
After deliberations following action plan was recommended:
All other stations to ensure their GT Tap positions are optimized so as to bring Grid Voltages to Nominal values.
It was viewed with concern that Kaiga GS had not changed the tap despite regular pursuance and all the adjoining utilities (KPTCL/KPCL) had carried out the recommended modifications.
RGMO/FGMO with MI & MVAR Interchange Meeting held on 30.09.2015 Page 10
It was noted that TPCIL and Krishnapatnam units should bring their taps to 400 kV on urgent basis. It was observed that TPCIL units were injecting MVARs (LV side of GT) and as per IEGC 6.6.6 they were to absorb MVAR as per grid requirement. Cumulative effort of all the units in that area (TPCIL, SEL, MEPL, Krishnapatnam and NCCPL) would help in mitigating the high voltage at NPS/Nellore. NCCPL should also come up with its tap at 400 kV.
Bellary, JSWEL and UPCL units should change the tap as per recommendations during first available opportunity and SLDCs should ensure the compliance.
It was noted that many of GT taps had not been changed due to technical constraints and there was no noticeable improvement in this regard. Therefore it was suggested that the GT tap changing issues could be reported as prolonged outage to Hon’ble CERC.
SRLDC could issue messages for Violation of IEGC clause 6.6.6. Messages to state generators would be routed through the respective SLDCs. In cases of no noticeable improvement, the matter could be reported under clause 1.5 of IEGC.
SRLDC pointed out that Srisailam and Nagarjunasagar units were not being put under condenser mode as per directions of SRLDC in certain instances. TSSLDC stated that they were complying with the directions of SRLDC.
SRLDC stared that all new units should come up at nominal grid voltage ( i.e 400 kV, 220 kV etc)
Limiter setting would be as per the capability curve. Any reduced settings needs to be justified technically through OEM.
Respective SLDCs would monitor VAR Interchange of the generators under their control and ensure better voltage profile.
All Generators agreed to take action on the tap changing recommendations. During outages GENCOs/SLDCs would ensure that the recommendations are implemented. Dates of Tap changes and set tap positions should be communicated to SRPC/SRLDC as and when changes are carried out. The same should also be reflected in the information which would be furnished for future analysis
400kV Tap changing is to be carried out only after concurrence of SRLDC.
Number of Generators were not furnishing timely information in correct format. It was suggested that information should be furnished in a timely manner.
Respective SLDCs would participate in reactive power demonstration testing along with the testing team for the units under their control area. Action to be taken on the recommendations finalized in testing report.
RGMO/FGMO with MI & MVAR Interchange Meeting held on 30.09.2015 Page 11
Calibration of meters would be undertaken to ensure accurate visibility of the parameters to the plant operators.
Some of the stations AVR voltage control was not going to +/- 5%. It would be examined and rectified.
Stations could undergo themselves reactive demonstration periodically as per the procedure.
It was noted that SEL absorption was getting restricted. SEL agreed to absorb MVAR upto recommended figure of 45 MVAR.
AVR would be kept in constant voltage mode at all the units.
The MVAR data to be posted on [email protected]. Data to be furnished by 5th of each month for the previous month in the web group in the requisite format. Data for state generators to be validated by respective SLDCs. Those who are not members of voltage group need to get in touch with SRLDC to become members.
It was recommended that all the stations should have data logging facility (up to six months) for fruitful analysis/deliberation.
Any, change in capability curves w.r.t. as furnished for MVAR document would be communicated. Wherever, CC is not clear information can be sent in table format also.
MS, SRPC thanked the participants for their active deliberations. He expressed
hope that the generators/SLDCs would take necessary steps on the
recommendations finalized in the meeting. Timely and validated information
was required to be posted on the respective web groups.
RGMO status point Extension Visibility to SRLDC-CGS
Station Eligible Units
RGMO/FGMO Commissioned
Visibility Not Available
RGMO / FGMO Not
Commissioned
Ramagundam 4,5,6,7 4,5,6,7 -----
Simhadri 3-4 3-4 -----
Talcher ST2* 3,4,5,6 3,4,5,6 -----
NLC2TS II ALL ALL -----
TPCIL 1,2 2 ----- 1
NLC TS I Expn 1&2 1&2 -----
Coastal 1 1 -----
NLC TS II Expn 1&2 1&2 -----
IL&FS 1 1 1
NTPL 1&2 1&2 1&2
Status of RGMO implementation-Status Update
• NLCSTIIEXP UNIT 1&UNIT 2
• TPCIL UNIT 1&2
• SDSTPS UNIT 1&2
• NTPL UNIT 1&2
• COASTAL ENERGEN UNIT 1
• METTUR STAGE 3
IEGC
IEGC
IEGC
RGMO PERFORMANCE OF SOUTHERN REGION ENTITIES
Incidents During last six Months
MONTH DATE TIME TYPE
Apr-15
07-04-15 21:01 DIP in FREQ
25-04-15 11:41 RISE IN FREQ
26-04-15 12:41 RISE IN FREQ
May-15 26-05-15 17:55 RISE in FREQ
Jun-15 26-06-15 19:13 DIP in FREQ
Jul-15 28-07-15 11:52 DIP in FREQ
Aug-15 19-08-15 02:33 DIP in FREQ
Sep-15 04-09-15 19:24 DIP in FREQ
-Max Response is 60% (SCHEDULE REDUCTION AT THAT TIME) -For frequency rise incidents almost reverse response -Overall response is AVERAGE
-30
-20
-10
0
10
20
30
1 2 3 4 5 6 7 8
RGDM U-4
EXP ACT
-40
-20
0
20
40
60
80
1 2 3 4 5 6 7 8
RGDM U-4
%RESPONSE
-No response except for 26th May incident. -Max 47% during 26th May -For all the incidents Generation is less than <500MW(Except for 7th Apr)
-30
-20
-10
0
10
20
30
1 2 3 4 5 6 7 8
RGDM U-5
EXP ACT
-60
-40
-20
0
20
40
60
80
100
1 2 3 4 5 6 7 8
RGDM U-5
%RESPONSE
-For 3 incidents Generation is above 500MW -Maximum response during 26th May -Over all performance is very poor.
-30
-20
-10
0
10
20
30
1 2 3 4 5 6 7 8
RGDM U-6
EXP ACT
-40
-20
0
20
40
60
80
100
120
1 2 3 4 5 6 7 8
RGDM U-6
%RESPONSE
-During rise in frequency(APR) generation was less than 360MW -Maximum response on 26th May-15 -Most of the time generation >= 500MW -Overall response is poor
-30
-20
-10
0
10
20
30
1 2 3 4 5 6 7 8
RGDM U-7
EXP ACT
-30
-20
-10
0
10
20
30
40
50
60
1 2 3 4 5 6 7 8
RGDM U-7
%RESPONSE
-30
-20
-10
0
10
20
30
1 2 3 4 5 6 7 8
SIM UNIT-3
EXP ACT
0
10
20
30
40
50
60
70
80
90
1 2 3 4 5 6 7 8
SIM UNIT-3
%RESPONSE
-Except for 7th Apr incident the response is Good -During all the incidents generation is <500MW -40-80% OF THE EXPECTED RESPONSE
-30
-20
-10
0
10
20
30
1 2 3 4 5 6 7 8
SIM UNIT-4
EXP ACT
-20
0
20
40
60
80
100
1 2 3 4 5 6 7 8
SIM UNIT-4
%RESPONSE
-For rise in frequency some response is there -For dip in frequency the response is poor -All the time generation is <500MW
-30
-20
-10
0
10
20
30
1 2 3 4 5 6 7 8
SIM UNIT-1
EXP ACT
0
20
40
60
80
100
120
1 2 3 4 5 6 7 8
SIM UNIT-1
%RESPONSE
-5 OUT OF 8 INCIDENTS THE RESPONSE IS AVERAGE -For frequency dip incidents yet to improved -All the time generation is less than 500MW
-30
-20
-10
0
10
20
30
1 2 3 4 5 6 7 8
SIM UNIT-2
EXP ACT
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7 8
SIM UNIT-2
%RESPONSE
-5 OUT OF 8 INCIDENTS THE RESPONSE IS AVERAGE -For frequency dip incidents yet to improved -All the time generation is less than 500MW
-20
-15
-10
-5
0
5
10
15
20
25
1 2 3 4 5 6 7 8
VALLUR UNIT-1
EXP ACT
0
20
40
60
80
100
120
1 2 3 4 5 6 7 8
VALLUR UNIT-1
%RESPONSE
-For dip in frequency response is good except for June incident -For rise in frequency no response -Generation during the incidents was < 350MW(During rise in Frequency)
-25
-20
-15
-10
-5
0
5
10
15
20
25
1 2 3 4 5 6 7 8
VALLUR UNIT-2
EXP ACT
-40
-30
-20
-10
0
10
20
30
40
50
60
1 2 3 4 5 6 7 8
VALLUR UNIT-2
%RESPONSE
-The unit was OUT for 4 incidents. -Response is poor for frequency rise incidents -For frequency dip incident response is average.
-15
-10
-5
0
5
10
15
1 2 3 4 5 6 7 8
NLC2 UNIT 1
EXP ACT
-40
-20
0
20
40
60
80
100
120
1 2 3 4 5 6 7 8
NLC2 UNIT 1
%RESPONSE
-FOR ALL THE NLC UNITS: -Reduction in generation for the frequency rise incidents is happening -For dip in frequency almost NIL or Reverse response.
-15
-10
-5
0
5
10
15
1 2 3 4 5 6 7 8
NLC2 UNIT 2
EXP ACT
0
10
20
30
40
50
60
70
80
90
1 2 3 4 5 6 7 8
NLC2 UNIT 2
%RESPONSE
-15
-10
-5
0
5
10
15
1 2 3 4 5 6 7 8
NLC2 UNIT 3
EXP ACT
0
10
20
30
40
50
60
70
80
90
1 2 3 4 5 6 7 8
NLC2 UNIT 3
%RESPONSE
-15
-10
-5
0
5
10
15
1 2 3 4 5 6 7 8
NLC2 UNIT 4
EXP ACT
0
10
20
30
40
50
60
70
80
1 2 3 4 5 6 7 8
NLC2 UNIT 4
%RESPONSE
-15
-10
-5
0
5
10
15
1 2 3 4 5 6 7 8
NLC2 UNIT 5
EXP ACT
0
20
40
60
80
100
120
140
160
1 2 3 4 5 6 7 8
NLC2 UNIT 5
%RESPONSE
-15
-10
-5
0
5
10
15
1 2 3 4 5 6 7 8
NLC2 UNIT 6
EXP ACT
-20
-10
0
10
20
30
40
1 2 3 4 5 6 7 8
NLC2 UNIT 6
%RESPONSE
-15
-10
-5
0
5
10
15
1 2 3 4 5 6 7 8
NLC2 UNIT 7
EXP ACT
-20
-10
0
10
20
30
40
50
60
70
80
1 2 3 4 5 6 7 8
NLC2 UNIT 7
%RESPONSE
-15
-10
-5
0
5
10
15
1 2 3 4 5 6 7 8
NLCEXP1 UNIT 1
EXP ACT
0
10
20
30
40
50
60
70
1 2 3 4 5 6 7 8
NLCEXP1 UNIT 1
%RESPONSE
-15
-10
-5
0
5
10
15
1 2 3 4 5 6 7 8
NLCEXP1 UNIT 2
EXP ACT
0
10
20
30
40
50
60
1 2 3 4 5 6 7 8
NLCEXP1 UNIT 2
%RESPONSE
-30
-20
-10
0
10
20
30
40
1 2 3 4 5 6 7 8
COASTAL UNIT-1
EXP ACT
-60.0
-40.0
-20.0
0.0
20.0
40.0
1 2 3 4 5 6 7 8
% RESPONSE
-Mostly reverse response -For 2 incidents some response is there
The person already connected to the grid shall also provide additional reactive compensation as per the quantum and time frame decided by respective RPC in consultation with RLDC. The Users and STUs shall provide information to RPC and RLDC regarding the installation and healthiness of the reactive compensation equipment on regular basis. RPC shall regularly monitor the status in this regard
Emphasis in IEGC
6.6.6 Reactive Power and Voltage Control
The ISGS and other generating stations connected to regional grid shall generate/absorb reactive power as per instructions of RLDC, within capability limits of the respective generating units, that is without sacrificing on the active generation required at that time. No payments shall be made to the generating companies for such VAr generation/absorption
Observations
• Observations made on the basis of details submitted by generating stations.
Tap position can be brought to 12(230kV) from 8(243kV) as voltage variation is 243-220kV
Mostly injecting to Grid
• BTPS
Tap position can be brought to 5(400kV) from 4(410kV)
Voltage variation- 420-399kV
Observations
• RTPS
Even though tap kept at 224kV, MVAR is being injected at 231kV for U#1 and U#2
Tap position for U#4,U#7,U#8 can be brought to 400kV
Tap position for U#6 kept at 400kV, only injection is observed
KPCL may clarify correct tap position
Observations
• NCTPS St 1
Voltage is less than 230kV; mostly injecting
• MEPL & SEL
Operating at higher LV reference leading to lesser absorption
Observations
• Vallur
All units are injecting at 400-410kV voltages even though the tap kept at 400kV
• Sharavathy
Except U#9(at 230kV) all other units kept at 220kV
Observations
• NLC II
Tap position of units connected at 220kV level.
Tap position specified is different in same file
Tap can be brought to 400kV level
• NLC I
Tap position can be kept at same voltage level.
Observations
• VTPS
Confirmation of tap status of U#3,4,5,6
• NCTPS St2
U#1Tap position to be changed to 400kV
• Kaiga
Tap position not specified
Observations
• TPCIL
Tap position to be brought to 400kV
• SDS,Krishnapatnam
Minimum Excitation Limit - Explanation
Observations
• Performing as per Capability curve
Simhadri , NLC I Expn, RTPP
• Analysis not done for following due to less/no generation
Recommendations of MVAR testing
VTPS
• Unit 1 to 6 – Change in tap position was recommended
- Not mentioned tap position in the submitted data
• Unit 7 – Absorption level increased as recommended
Recommendations of MVAR testing
Kadra
• Tap position suggested No.8 (222.75kV)
• Present tap of all units at 7(225.5kV)
Kodasalli
• Review of AVR setting recommended
• Taps of all units may be brought to 8 (222.75kV)
Recommendations of MVAR testing
Simhadri
• Difference in load angle limiter operation
MEPL & SEL
• Operating at higher LV reference leading to lesser absorption
Recommendations of MVAR testing
MTPS
• Tap position at 235.75 kV (No.7) for 3 units & one unit at 230kV
• Tap position of all units to be set at same voltage so as to avoid circulating current
Details Submitted
Data Not Submitted
Ramagundam - All units
MAPS
Talcher Stg II
NTPL
Coastal Energen
KTPS
Kakatiya TPS
Data Not in Format
• VTPS
• RTPP
• Lanco
• NCTPS St2
• Jindal
• SDS,Krishnapatnam
Unknown is Ocean
Known is Drop
TANGEDCO & The constituents of Southern Region
sincerely thanked
Hon’ble CERC,
The Respected Chairman, Committee on FGMO,
All the Respected Members,
The Respected Convener
For having given the oppurtunity in the process of
for fine tuning the FGMO/RGMO performance of our
Generating units to serve to our Country
NCTPS, TANGEDCO
Committee held 3 meetings at CERC; first meeting was
held on 03.11.2014, second meeting was held on
21.11.2014 and the third meeting was held on 16.03.2015.
750 MW
The TOR of the Committee reads as below:
(i)To look into the problems of generating units
in implementing RGMO/FGMO
(ii) To suggest measures for implementation of
FGMO with suitable modifications /
amendments in CERC Regulations / IEGC
(iii) Any other recommendations to facilitate
FGMO operation
NCTPS, TANGEDCO
750 MW
NCTPS, TANGEDCO
TANGEDCO thank
The Member Secretary, SRPC
SRLDC, POSOCO and The Constiuents
For having given the opportunity to
share the experience on RGMO to
the constituents of Southern Region
750 MW
NCTPS, TANGEDCO
Date RGMO Expected Actual RGMO
Response % Achieved
Frequency dip
07 04 2015 883.41 159.24 18.03
26.06.2015 638.69 23.52 3.68
28.07.2015 714.34 118.45 16.58
19.08.2015 750.48 157.32 20.96
04.09.2015 725.72 148.154 20.41
Frequency raise
25.04.2015 -754.35 -76.16 10.1
26.04.2015 -726.31 -153.23 21.1
26.05.2015 -822.89 -237.81 28.9
For the period from Apr 2015 to Sep 2015
Courtesy: SRLDC
750 MW
8 MW from NCTPS Unit 3 for 26.06.2015
883.4
638.7714.3 750.5 725.7
159.2
23.5118.5 157.3 148.2
0.0
200.0
400.0
600.0
800.0
1000.0
1 2 3 4 5
MW
Incident
RGMO Target Vs Actual by Southern Region, India -Frequency Dip during Apr - Sep 2015
RGMO Target RGMO Actual
NCTPS, TANGEDCO
Courtesy: SRLDC
750 MW
NCTPS, TANGEDCO
RGMO Target Vs Actual by Southern Region, India -
Frequency raise during Apr - Sep 2015
-754.4 -726.3
-822.9
-76.2-153.2
-237.8
-900.0
-800.0
-700.0
-600.0
-500.0
-400.0
-300.0
-200.0
-100.0
0.0
1 2 3
Incident
MW
RGMO Target RGMO Actual Courtesy: SRLDC
750 MW
NCTPS, TANGEDCO
Date RGMO Expected Actual RGMO
Response % Achieved
Frequency dip
07 04 2015 883.41 159.24 18.03
26.06.2015 638.69 23.52 3.68
28.07.2015 714.34 118.45 16.58
19.08.2015 750.48 157.32 20.96
04.09.2015 725.72 148.154 20.41
Frequency raise
25.04.2015 -754.35 -76.16 10.1
26.04.2015 -726.31 -153.23 21.1
26.05.2015 -822.89 -237.81 28.9
For the period from Apr 2015 to Sep 2015
Courtesy: SRLDC
750 MW
NCTPS, TANGEDCO
Date MCR of Machines
on Bar Calculated RGMO
5% of MCR RGMO Expected by
SRPC 5% MCR Actual RGMO
response
Frequency dip incidents
2-Sep-13 20069 1003.45 1003 -9
3-Sep-13 19709 985.45 985 160
5-Sep-13 19977 998.85 999 29
7-Sep-13 20272 1013.6 1014 -178
10-Sep-13 17719 885.95 886 276
12-Sep-13 20553 1027.65 1028 61
13-Sep-13 19935 996.75 997 69
19-Sep-13 22495 1124.75 1125 -25
21-Sep-13 22070 1103.5 1104 359
25-Sep-13 21977 1098.85 1099 3
Frequency raise incidents :
1-Sep-13 20223 -1011.15 -1011 146
6-Sep-13 19555 -977.75 -978 21
10-Sep-13 17719 -885.95 -602 -62
13-Sep-13 19208 -960.4 -959 -128
14-Sep-13 19716 -985.8 -984 -36
16-Sep-13 22529 -1126.45 -1125 -221
19-Sep-13 20097 -1004.85 -1003 -222
Courtesy: SRLDC
750 MW
NCTPS, TANGEDCO
1003 985 999 1014
886
1028 997
1125 1104 1099
-9
160
29
-178
276
61 69
-25
359
3
-400
-200
0
200
400
600
800
1000
1200
1 2 3 4 5 6 7 8 9 10
MW
Incidents
RGMO target Vs Achieved by Southern Region, India
RGMO target RGMO response Courtesy: SRLDC
On 02 Mar 2015 incident, SR response was 159 * MW as against the thermal target of 744 MW
No of incidents no negative direction 1000 MW
Sep 2013
750 MW
NCTPS, TANGEDCO
Reverse response 07.04.2015
Station Unit IC in MW Rgmo Status
StartGen EndGen First/
Second Response
Simhadri Stage1
2 500 RGMO 476.29 474.26 -2.03
Neyveli TS II
5 210 RGMO 220.31 219.48 -0.83
Neyveli TS II
7 210 RGMO 218.38 217.54 -0.84
Jindal 3 300 RGMO 299.32 298.18 -1.14
Raichur TPS
3 210 RGMO 198.73 198.35 -0.38
Raichur TPS
8 250 RGMO 181.99 181.54 -0.45
UPCL 1 600 RGMO 496.96 493.54 -3.42
Total -9.09
RGMO Target Vs Actual by Southern region, India -
Ferquency dip
Apr to Sep 2015
883.4
638.7714.3 750.5 725.7
159.2
23.5118.5 157.3 148.2
0.0
200.0
400.0
600.0
800.0
1000.0
1 2 3 4 5
Incident
MW
RGMO Target RGMO Series
NCTPS, TANGEDCO
Courtesy: SRLDC
750 MW
NCTPS, TANGEDCO
RGMO Target Vs Actual by Southern Region, India Frequency raise during
Apr - Sep 2015
-754.4 -726.3-822.9
-76.2-153.2
-237.8
-1000.0
-800.0
-600.0
-400.0
-200.0
0.01 2 3
Incident
MW
RGMO Target RGMO ActutalCourtesy: SRLDC
750 MW
NCTPS, TANGEDCO
1003 985 999 1014
886
1028 997
1125 1104 1099
-9
160
29
-178
276
61 69-25
359
3
-400
-200
0
200
400
600
800
1000
1200
1 2 3 4 5 6 7 8 9 10
MW
Incidents
RGMO Expected Vs Response Frequency dip
Expected RGMO MW Actual RGMO Response MW Courtesy: SRLDC
On 02 Mar 2015 incident, SR response was 159 * MW as against the target of 744 MW
Response around 0 MW
Target around 1000 MW
Southern Region, India
Sep 2013
750 MW
NCTPS, TANGEDCO
-1011 -978
-602
-959 -984
-1125-1003
14621
-62-128
-36
-221 -222
-1200
-1000
-800
-600
-400
-200
0
200
400
1 2 3 4 5 6 7
MW
Incidents
RGMO Expected Vs Response Frequency rise
Expected RGMO MW Actual RGMO Response MW Courtesy: SRLDC
Target around -1000 MW
Response around 0 MW
Southern Region, India
Sep 2013
750 MW
NCTPS, TANGEDCO
Required RGMO Performance or MW output
Consistency among Units of a station
for a single RGMO incident
Consistency of station for several RGMO incidents
Sustainability for 2 – 3 minutes
System demand that for narrowing down the gap between the target & response
Sustainability for 2 – 3 minutes by all the Units
is the ultimate target and the result by RGMO will
have to be analysed by the Power System Engineers. ???
Consistency of a single Unit for
several RGMO incidents
750 MW
NCTPS, TANGEDCO
Performance of NTECL, Tamilnadu, SR
Unit # MCR of
Machines on Bar
5% of MCR
Current generati
on
RGMO Expected 5%
current generation
Actual RGMO
response
% achieveme
nt
I 500 25 339 16.95 16 94.4
II 500 25 356 17.80 16 89.89
III 500 S/D -- -- -- --
KWU turbines EHG System - RGMO
Date of incident : 02 Mar 2015 49.98 Hz to 49.78 Hz
34.75 32 92.08% Station
JV of NTPC & TNEB
Courtesy: SRLDC
750 MW
NCTPS, TANGEDCO
Sl. No
Name of Thermal Station
Unit No.
MW Capa- city
Generation at the instant
Governor Mode
From
(MW) To
(MW) Pickup
(MW) Remarks if any
Incident 1 : 01.11.2014 02:20 to 02:21 Hrs 50.00 Hz to 49.88 Hz
1
North Chennai Thermal Power Station
I 210
157 RGMO 157
168 11 26 MW raise has
been pumped into the grid with 5.06% increase at the instant generation level.
2 II 210
201 RGMO 201
209 8
3 III 210
153 RGMO 153
160 7
Incident 2 : 05.11.2014 10:31 to 10:32 Hrs 50.05 Hz to 50.14 Hz
1 North
Chennai Thermal Power Station
I 210
170 RGMO
170 167 3 15 MW fall with
2.78% decrease at the instant generation level has been performed.
2 II 210
200 RGMO 200
190 10
3 III 210
169 RGMO 169 167 2
Incident 3 : 23.11.2014 12:16 to 12:17 Hrs 49.94 Hz to 49.78 Hz
1
North Chennai Thermal Power Station
I 210 194 RGMO 194 205 11 28 MW raise has
been pumped into the grid with 4.71% increase at the instant generation level.
2 II 210 204 RGMO 204 211 7
3 III 210 197 RGMO 197 207 10
RGMO response of North Chennai Thermal PS 3 x 210 MW Units TNAGEDCO, SR
750 MW
NCTPS, TANGEDCO
Sl. No
Name of Thermal Station
Unit No.
MW Capa- city
Generation at the instant
Governor
Mode
From
(MW) To
(MW)
Pickup
(MW) Remarks if any
Incident 4 : 16.12.2014 10:03 to 10:04 Hrs 50.00 Hz to 50.10 Hz
1 North Chennai Thermal Power Station
I 210 210 RGMO 210 199 11 24 MW fall with 4.26%
decrease at the instant generation level has been performed.
2 II 210 208 RGMO 208 195 13
3 III 210 145 RGMO 145 145 0
Incident 5 : 14.01.2015 19:21 to 19:22 Hrs 50.05 Hz to 49.88 Hz
1
North Chennai Thermal Power Station
I 210
S/D RGMO
--
-- -- 10 MW raise has been
pumped into the grid with 2.72% increase at the instant generation level. Unit 2 - Frequency dip for RGMO not captured due to elevated f measurement. Unit 3 Inspite of process requirement for fall in MW from 198 to 194 MW just before RGMO instance, RGMO lifted this unit level to 204 MW (5.15%)
2 II 210
173 RGMO
173 173 0
3 III 210
194 RGMO
194 204 10
Incident 6 : 02.03.2015 06:49 to 06:50 Hrs 50.03 Hz to 49.77 Hz
1
North Chennai Thermal Power Station
I 210 213
RGMO 213 214 1 17 MW raise has been pumped
into the grid with 2.68% increase at the instant generation level. Unit 1 – Due to reduced Pressure and load limiter. The operators instructed to keep the load limiter considering RGMO demand.
2 II 210 213
RGMO 213 220 7
3 III 210
209 RGMO
209 218 9
12/17 Incidents
750 MW
NCTPS, TANGEDCO
Performance of North Chennai Thermal Power Station, TANGEDCO, SR
Date MCR of
Machines on Bar
5% of MCR
Current generati
on
RGMO Expected 5%
current generation
Actual RGMO
response
% achievemen
t Remarks
01.11.2014 630 31.5 511 25.6 26 101.76
05.11.2014 630 31.5 539 19.4 15 77.30 Fall of frequency is 0.09 Hz only and target corrected.