Baart sarkar kond`Iya ivaVut p`aiQakrNa piScama xao~Iya ivaVut saimait ef -3, emaAayaDIsaI xao~, AMQaorI (pUva-), mauMba[- - 400 093 Aa[- esa Aao : 9001-2015 Government of India ISO : 9001-2015 Central Electricity Authority Western Regional Power Committee F-3, MIDC Area, Andheri (East), Mumbai - 400 093 dUrBaaYa / phone: 022- 28221636; 28221681; 28220194-6 fO@sa /fax: 022 – 28370193 वेबसाइट/ website: www.wrpc.nic.in ईमेल/e-mail: [email protected]
Date:19.05.2021 No: WRPC/Opn/OCC/2021-22/ To
As per list,
Sub: Agenda for 543rd OCC meeting to be held on 21.05.2021 -reg
543rd Meeting of Operation Coordination Sub Committee (OCC) will be held on 21.05.2021(Friday) at 11:00 Hrs through Video conferencing. Kindly make it convenient to attend the same. Agenda for the OCC Meeting is enclosed herewith for your reference.
Thanking You. Yours faithfully,
Sd/- (Deepak N Gawali) Superintending Engineer (Opn)
List of OCC Members
1. Chief Engineer (L D), GETCO, Gotri 0263-2352019 2. Chief Engineer (Generation), GSECL, Vadodara 0265-2344734/2338847 3. Superintendent Engineer (CP & SS), GETCO, Vadodara 0265-2337918, 2338164 4. Chief Engineer (L D), MPPTCL, Jabalpur 0761-2664343 5. Chief Engineer (O&M:Gen), MPPGCL, Jabalpur 0761-2664572/2668050 6. Chief Engineer (L D), MSETCL, Kalwa 022–27601769 7. Chief Engineer (PP), MSEDCL, Mumbai 8. Chief Engineer (Works),MSPGCL, Mumbai 022-26473896 9. Superintending Engineer (LD), MSETCL Ambazari 07104-220275 10. Chief Engineer (L D), CSPTCL /Raipur 0771-2574174 11. Chief Engineer (O&M:GEN), CSPGCL, Raipur 0771-2574425 12. Executive Director, PGCIL Raipur 13. General Manager, POSOCO, Mumbai 022-28202630 14. General Manager (WRTS-I), Powergrid, Nagpur 0712-2641366 15. General Manager (O & M),WRTS-II, PGCIL,Vadodara 0265-2487542 16. Chief Engineer (Transmission), NPCIL, Mumbai 25580741/25563350 17. Station Director, TAPS, Tarapur 1 & 2 02525-282125/244125 18. Station Director, TAPS, Tarapur 3 & 4 02525-244021/244169 19. Station Director, KAPS, Kakrapar 1 &2 02626-231231 20. Station Director, KAPS, Kakrapar 3 & 4 21. General Manager (OS), NTPC, Mumbai 022-28216692 22. General Manager, NTPC, Korba 07759- 237462/237552 23. General Manager (OS), NTPC, HQ-II Raipur 0771-2544550 24. General Manager, NTPC, Vindhyachal, M.P. 07805 –247711 25. General Manager, NTPC, SIPAT, CG 07752-246504 26. General Manager NTPC LARA 27. General Manager NTPC Gadarwada 28. General Manager NTPC Khargone 29. General Manager NTPC Solapur 30. General Manager, NTPC, Kawas, Surat 0261-2860290 31. General Manager, NTPC, Gandhar 02642-287402 32. General Manager, NTPC, Mouda 07115-281221/281219 34. CLD TPC, Mumbai 022-25541908/67175385 35. Head (O), Dahanu TPS, Dahanu 02528-222039 36. Sr V P Reliance Transmission, Pune 0124-3917982/020- 30471555 Vice President (Generation), Torrent Power Ltd, Ahmedabad 079-27506679 37. Executive Director, Sugen CCPP, Torrent Power Ltd, Surat. 02621-661151 38. Vice President (O &M), APL Mundra , Gujarat 02838-266364 39. Head Operation CGPL Mundra 40. Vice President (Opn), Jindal Power Ltd.,Raigarh 07767-281993/281995 41. AGM(OS) NSPCL Delhi 011-26717363,26717366 42. GENERAL MANAGER ( POWER), RGPPL, Ratnagiri 02359-241071/ 241011 43. Member (Power), NCA, Indore 0731-2559888 44. Chief Engineer (PM & C), NHDC, Bhopal 0755 4030188/4030130 45. E. E. Elect. (Ponda), Goa 0832-2313780 46. Executive Engineer DD (UT), Daman 0260-/2230771/2250889/2230550 47. Executive Engineer DNH (UT), Silvassa 0260-2642338 48. Secretary, CERC, New Delhi 011-24360010/23753923 49. CEO, JSW Energy ltd. 011-46032343/26183546 50. VP-Power Infra-Essar Hazira Surat 0261-6688498/022-67082198 51. Chief Electrical Distribution Engineer CR 022-22621060 52. Vice President EPTCL Hazira Surat 0261-6682747 53. COO, Korba West Power Co. Ltd. Raigarh 54. VP(COMML) Essar Power MP Ltd MP 55. GM Torrent power grid ltd. Ahmedabad, Gujarat 56. Adani Power Maharashtra Ltd Tiroda 57. CGM, R K M Powergen Pvt Ltd 58. ED, Athena Chattishgarh Power Ltd. 59. Head(O&M) Dhariwal Infra Ltd C’pur 60. Head Operation Jaypee Nigrie STPP Singrauli. 61. VP(O&M), GCEL, Chhattishgarh 62. Head Operation DB Power, Chhattishgarh. 63. Head operation Hindustan Power, Anuppur MP 64. Head operation GMR, Warora Energy ltd. 65 Head O&M, Sterlite Grid Ltd Bhopal 66 Head Operation Balco, Chhattishgarh. 67 Head(O& M), SKS, SPGCL, Raigarh 68 AVP,O&M Electrical,RIPL,Amravati
Western Regional Power Committee Mumbai
Title: Agenda Notes Meeting no.: 543 Meeting name: Operation & Coordination sub-Committee Date & venue: 21st April 2021 through VC
Item No. 1: Confirmation of the Minutes Minutes of 542nd meeting of Operation & Coordination Sub-Committee (OCC) of WRPC held on 23rd April 2021 at WRPC,Mumbai were issued vide letter No. WRPC/OPN/OCC-Minutes/2021-22/5271 dated 18.05.2021 Sub-Committee may discuss and confirm the Minutes.
Item No. 2: Review of System Operation during the month of February, 2021. 2.1 A. Frequency Particulars The frequency profile was as under: Particulars Frequency Date Time Maximum 50.30 Hz 04th April, 2021 18:01:10 hrs instantaneous Minimum 49.69 Hz 11th April, 2021 21:07:40 hrs instantaneous Average 50.00 Hz
01st – 28th February 01st – 31th March 01st – 30th Range 2021 2021 April 2021 (% time) (% time) (% time)
IEGC band (49.9 < f < 72.75 74.94 50.05 Hz) 76.26 < 49.9 Hz 7.12 7.14 7.96 > 50.05 Hz 16.62 20.11 17.11 The frequency particulars are enclosed at Annex-2.1. The Sub-Committee may note.
541th OCC Agenda Page 1
2.1 B. State-wise Power Scenarios of the Region & Power Supply Position report System operation during the month of April 2021 was satisfactory. The regional demand was 60966 MW. The corresponding peak shortfall was 0 MW (peak deficit of 0.00%). The energy requirement during the said period was 39197 MUs. The power supply position (Provisional) for the month of April 2021 was as follows: Peak Demand - Availability/Unrestricted Requirement In MW
GUJ MP CG MAH GOA DD DNH ESIL WR
REQUIREMENT 19360 11392 4792 25653 614 344 847 884 60966
AVAILABILITY 19360 11392 4787 25644 605 344 847 884 60966
SHORTFALL 0.00 0.00 5.03 8.98 8.77 0.00 0.30 0.00 0.00
% SHORTFALL 0.00 0.00 0.10 0.03 1.43 0.00 0.03 0.00 0.00
Reason for FC - - FC - - FC - FC and short- fall * USLS+SLS
Energy - Availability/ Requirement etc.(Ex-Bus) in (MUs)
GUJ MP CG MAH GOA DD DNH ESIL WR
Net Actual Energy Supplied 39195. 12358 6900 3070 15551 421 228 608 56 84 Unrestricted Requirement 12518. 7033.2 3129.8 235.9 629.9 39768.7 04 9 4 15730.06 433.51 4 3 58.14 6 SHORTFALL in MU 0.00 0.00 1.17 0.02 0.00 0.00 0.00 0.00 1.19 % SHORTFALL 0.00 0.00 0.04 0.00 0.00 0.00 0.00 0.00 0.00
*FC-frequency Correction, ULS-Unscheduled Load Shedding, SCS-Scheduled load shedding, TC-Transmission constraint, CS-capacity Shortage, SC-Sign change Provisional Power Supply Position of April-2021 is attached at Annexure 2.1B.
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2.2 Inter-Regional Exchanges There was a net inter-regional export of 8922 MUs from WR to other regions against net export schedule of 8839 MUs. The Sub-Committee may kindly note/discuss.
2.3 Voltage Profile Voltage profile at some of 765/400 kV sub-stations furnished by WRLDC is enclosed at Annex-2.3. The Sub-Committee may kindly note/discuss.
2.4 U/F Relay Operations As per WRLDC records the system frequency didn’t reach 49.4 Hz and no UFR operation was reported to WRLDC. The Sub-Committee may kindly note/discuss..
2.5 Power Cuts / Load Restrictions Details of Power Cuts and Regulatory measures as furnished by the State utilities are given in Annex. 2.5. The Sub-Committee may kindly note/discuss.
2.6 Details of Generating Units under Forced Outages Details of generating units under forced outages are given in Annex-2.6. The Sub-Committee may kindly note/discuss.
2.7 Details of Generating Units under Planned Outages. The details of generating units under Planned Outages are given in Annex-2.7. The Sub-Committee may kindly note/discuss.
2.8 Presentation on operational aspects by SLDCs & RLDC. All SLDC’s/RLDC, NTPC & PGCIL may kindly submit the presentation on operational aspects during last month and specific issues thatneed deliberations may be highlighted separately.
2.9 List of New Grid Elements added / list of elements decommissioned. The list of New Elements added in WR Grid is attached at Annexure-2.9. The Sub-Committee may like to note/discuss. the same. 2.10 Submission of failure analysis of grid elements Under regulation 27 of CEA (Grid Standards) Regulations, 2010, failure analysis of equipment failure and tower collapse are to be submitted to RPC and Authority.
541th OCC Agenda Page 3
All the constituents are requested to report incidences of equipment failure and tower collapse to RPC and Authority as and when such incidences take place. The Sub-Committee may kindly note/discuss..
Item No. 3: Operational Planning 3.1 Proposed planned maintenance programmeforgenerating units. The maintenance programme of generating units for the months of May 2021 and June 2021 is given in Annex 3.1. The Sub-Committee may kindly discuss and finalize the outage schedule of generating units for the above period.
3.2 Outage programme of transmission lines/elements. List of proposals for transmission elements outage to be availed during the months of June 2021 is given in Annex 3.2. The Sub-Committee may kindly discuss and finalize the outages of the transmission elements.
The Sub-Committee may kindly note/discuss..
3.3 Anticipated power supply position for the months. Details of anticipated restricted & un-restricted demands for the months of May 2021 and June 2021 are given in Annex 3.3.
The Sub-Committee may like to note/update.
Item No. 4: Operational Statistics for the month of April 2021. The details of actual generation, demand, drawl of power from grid; exchanges etc. are given in the following Annexure: Annex 4.1 – Monthly Generation. Annex 4.2 - Peak Demand. Annex 4.3- Integrated Operation of the System and Operation of Inter- State Tie lines. Annex 4.4– Details of level of Major Reservoirs in the Western Region. The Sub-Committee may kindly note/discuss.
541th OCC Agenda Page 4
Item No. 5: System disturbances in the western region. There was no major grid disturbance in the Western Region during the month of April 2021. The relevant details are enclosed at Annexure-5.
The Sub-Committee may kindly note/discuss.
Item no. 8: Miscellaneous Operational Items
8.1. Loading on MP grid due to shut down on elements of PGCIL and other entities: -
SLDC MP, vide email dated informed that on dtd 05.05.21, s/d was taken on 765kv Bhopal(BDTCL)-Indore ckt from 09.38hrs to 17.50hrs (although s/d was approved from 09.00hrs to 12.00 hrs only), for rectification of non - operation of A/R at BDTCL end. As the s/d started, the power which was in the direction from Bhopal to Indore, now turned towards 400kv ss Bhopal MP and in the downstream network i.e Bhopal ICTs and 220kv Bhopal-Bhopal ckt 1 ,2, thus causing the increased loading there.
In month of January-21, a similar kind of excessive loading scenario seen over Betul area where due to s/d of 400 kV Mouda-Wardha- 1&2, Betul 400/220 kV 315 MVA ICTs were heavily loaded (300 MW each) and were not (N-1) secure.
Thus, it is requested that prior to providing these kinds of important s/d, where the downstream network is getting involved, proper study and involvement of affecting entities should be taken into cognizance along with the real time consent and intimation, so that to avoid any unforeseen situation.
OCC Sub Committee may discuss.
Item no. 9: WRLDC Agenda
9.1 Primary Frequency Response
Average primary response of generators for the last three events is shown below
541th OCC Agenda Page 5
Event-50 Event-51 Event-52
Event-50 Event-51 Event-52
ER-1507 NR-1586 SR-1045
10/03/202 08/04/20 1 24/03/202 21 19:35:30 1 12:16:20 03:31:30 Average 50.02 50.02 49.99 Respons e as % of S.No Station 49.95 49.91 49.95 Ideal
1 VSTPS-V(1x500) 100% 24% 100% 75%
2 SASAN(6x660) 48% 52% 91% 64%
3 SKS (2x300) 0% 85% 100% 62%
4 SIPAT-I(3x660) 39% 46% 100% 62%
5 KSTPS-II(3x500) 43% 44% 88% 59%
6 JP NIGRIE(2x600) 42% 27% 98% 56%
7 Balco (4x300) 43% 42% 78% 54%
8 NSPCL (2x250) 48% 12% 77% 46%
9 GMR Warora (2x300) 71% 18% 0% 45%
10 KSTPS-I (3x200) 59% 0% 68% 42%
11 Essar Mahan(2x600) 0% 108% 0% 36%
12 KSTPS-III(1x500) 0% 14% 85% 33%
13 Mouda-I(2x500) 9% 74% 0% 28%
14 DB Power(2x600) 49% 29% 0% 26%
15 Lara (1x800) 0% 10% 41% 26%
16 TRN (2x300) 11% 27% 34% 24%
17 VSTPS-IV(2x500) 0% 7% 45% 17%
541th OCC Agenda Page 6
18 RKM (3x360) 48% 0% 0% 16%
19 Khargone(2x660) 3% 43% 0% 15%
20 Jhabua (1x600) 0% 15% 0% 15%
21 RGPPL 44% 0% 0% 15%
22 Gadarwara (1x800) 0% 41% 0% 14%
23 REGL(1x600) 21% 4% 0% 8%
24 MB Power(2x600) 20% 2% 0% 8%
25 Mouda-II (2x660) 20% 0% 0% 7%
26 VSTPS-III(2x500) 4% 0% 16% 6%
27 JPL I (4x250) 1% 14% 1% 5%
28 SIPAT-II(2x500) 0% 14% 0% 5%
JPL Tamnar (Stage 29 II)(4x600) 0% 0% 11% 4%
30 VSTPS-II(2x500) 0% 7% 0% 2%
31 Solapur (2x660) 0% 0% 6% 2%
32 REL(2x685) 0% 2% 0% 1%
33 CGPL(5x830) 0% 0% 0% 0%
34 KSK(3x600) 0% 0% 0% 0%
35 Lanco (2x300) 0% 0% 0% 0%
36 MCPL (1x300) 0% 0% 0% 0%
37 SSP-CBPH (5x50) 0% 0% 0% 0%
38 Kawas (4x106+2x116) 0% 0% 0% 0%
39 VSTPS-I (6x210) 0% 0% 0% 0%
Data non-current/Zero Generation Information related to the above Grid events is available in “Latest updates” section of WRLDC website of (https://wrldc.in) and also circulated in OCC group through Email.
541th OCC Agenda Page 7
Based on the “report of expert group to review and suggest measures for bringing power system operation closer to national reference frequency”, the minimum frequency response expected is at least 40% of ideal response.
Generating stations whose frequency response is below 40% may apprise OCC, actions being taken to improve the frequency response.
OCC Sub Committee may discuss.
9.2. Black Start mock drill Exercise in Western Region.
As mandated by IEGC, the Black start capable units need to conduct mock black start exercises once in every 6 months. Western Region has 28 generating stations with black start capability. In year 2021 out of 28 station only 4 stations had conducted black start mock drills. Utilities/Constituents are requested to plan Mock exercise of their black start units in 2021 and provide tentative plan to WRLDC.
Date of Tentative Mock drill plan to S. Power Installed Unit DG Set done in conduct No Station Cap. (MW) Type Capacity 2021 Black start mock drill in 2021
Hydr 1 Ukai (H) 4 x 75 500 kVA o
Hydr 2 Kadana 4 x 60 500 KVA o
1 x 107 (68+39) 2x800 3 Dhuvaran Gas + 1 x 112 KVA (72+40)
541th OCC Agenda Page 8
Date of Tentative Mock drill plan to S. Power Installed Unit DG Set done in conduct No Station Cap. (MW) Type Capacity 2021 Black start mock drill in 2021
Gas 1x104+1x5 / 4 GIPCL-II 500 kVA 6 Stea m
GPEC(CLPI 3x138+1x2 5 PL) Gas 3000 kVA 41 (No PPA*)
Sugen 3x382.5 6 (*Difficulty Gas 2x6MVA in bus split MW operation)
Gandhisag Hydr 7 5 x 23 100 kVA ar o
220 Volt Birsinghpu Hydr 8 1 x 20 DC r o Battery
Hydr 23rd Mar 21 9 Pench 2 x 80 250 kVA o
Hydr 10 Bargi 2 x 45 250 kVA o
Hydr 11 Tons 3 x 105 250 kVA o
Indira Hydr 2x1000 12 8x125 Sagar o KVA
Omkareswa Hydr 2x2010 13 8x65 r o KVA
541th OCC Agenda Page 9
Date of Tentative Mock drill plan to S. Power Installed Unit DG Set done in conduct No Station Cap. (MW) Type Capacity 2021 Black start mock drill in 2021
Hydr 10th Jan 21 14 Medikheda 3x20 250 KVA o
Hydr 15 Rajghat 3x15 250 KVA o
Hasdeo Hydr 16 3 x 40 250 kVA Bango o
Koyna I & 4 x 65 Hydr 17 2 MVA II 4 x 75 o
Hydr 18 Paithan 1 x12 - o
4 MW
4 x 60 (GT) PH1:412k + 4x108 VA 19 Uran (Gas) (GT)+ Gas PH2:450k 2x120 VA WHR WH:520k VA
Hydr 1x1250 20 Ghatghar 2x125 o kVA
Hydr DC power 21 Khopoli 3x24 o (self-start)
3 x 24 Hydr 22 Bhivpuri -do- o
Hydr 23 Bhira 6 x 25 500 kVA o
Hydr 24 Bhira PSS 1 x 150 500 kVA o
541th OCC Agenda Page 10
Date of Tentative Mock drill plan to S. Power Installed Unit DG Set done in conduct No Station Cap. (MW) Type Capacity 2021 Black start mock drill in 2021
Gas 25 Turbi Trombay 1 x 120 ne 2.5 MW
Stea m 1 x 60 Turbi ne
4 x 106 19th Jan 21 26 Kawas Gas 2850 KW 2 x 116
3 x 144 19th Jan 21 27 Gandhar Gas 2975 KW + 1x225
SSP (RBPH 6x200+5*5 Hydr 2x1000kV 28 & CHPH) 0 o A
As per section 5.8(b) of IEGC,
“…the Diesel generator sets for black start would be tested on weekly basis & the test report shall be sent to RLDC on quarterly basis.”
In 537th OCC meeting all SLDCs and generating stations agreed to send quarterly report on DG set testing at black start stations to [email protected] and [email protected]. It is requested to send DG set testing reports for January to March 2021 quarter and other past quarter pending report at the earliest.
OCC committee may like to discuss
SLDCs and generating stations to share their tentative plan for mock drills of black start stations in 2021 Submission of last quarterly report on testing of diesel generators on weekly basis to WRLDC 541th OCC Agenda Page 11
9.3. Status of Compliance to LVRT and HVRT by RE Generators Regulation
LVRT: Low Voltage Ride Through compliance details from SLDCs
The Central Electricity Authority (Technical Standards for Connectivity to the Grid) (Amendment) Regulations, 2019 was notified on 6 Feb 2019. This amendment has several provisions in respect of Renewable Energy (RE) generation. The amendments would be applicable to all new generating units commissioned after 6th Aug 2019.
Prior to this amendment, one amendment was notified by CEA on 15th Oct 2013 and effective for all units commissioned after 15th Apr 2014. The ability of RE generators to successfully ride through faults in transmission system commonly known as LVRT (Low Voltage Ride Through) was first introduced in 15th Oct 2013 amendment by CEA. This was applicable for all wind generators connected to 66 kV and above commissioned after 15th Apr 2014.
CERC order dated 05.01.16 in Petition No.420/MP/2014 mandates compliance of LVRT in all Wind Turbine Generators (except for Stall Type WTGs) having capacity more than 500 kW connected to voltage level of 66 kV and above. In CERC order dated 05.01.16, SLDCs are directed to prepare quarterly report on installation and performance of LVRT on existing WTGs and submit to RPCs.
The capacity of LVRT compliant wind turbines and status of compliance by wind turbine generators connected is discussed in 495th, 496th, 504th, 513th, 519th,526th and 528th OCC meetings. The issue was also discussed in REIF meetings. LVRT is technical requirement from the point of view of the safety and security of the grid. CERC has already directed all WTGs of capacity equal to or more than 500 kW except Stall Type WTGs to comply with LVRT.
541th OCC Agenda Page 12
As per 526th OCC LVRT compliance details received from SLDCs are as follows:
Capacity to LVRT Install % of Type of be LVRT Complied State/Util ed LVRT Generati Compliant capacity (MW) ity Capaci Compli on as per state as obtained ty (MW) ed from SLDCs Capaci ty Wind 6174 5091 2195 43 Gujarat % Information Information Solar 2283 yet to be yet to be received received Wind 4769 3206 755 24 Maharash % tra Information Information Solar 1305 yet to be yet to be received received Wind 2430 1435 1020 71 M % P Solar 1343 Information Information yet to be yet to be received received
HVRT:
As per Central Electricity Authority (Technical Standards for Connectivity to the Grid) (Amendment) Regulations, 2019, the generating station connected to the grid, shall remain connected to the grid when voltage at the interconnection point, on any or all phases (symmetrical or asymmetrical overvoltage conditions) rises above the specified values given below for specified time.
541th OCC Agenda Page 13
WRLDC COMMENTS: The updated status of compliance details of LVRT and HVRT are requested to be submitted by SLDCs.
OCC members may like to discuss:
1. Status of wind capacity and solar capacity compliant to LVRT and HVRT w.r.t total RE capacity
2. Submission of quarterly report by SLDCs to RPC on installation and performance of LVRT on existing WTGs and Solar power plants.
3. Practices adopted by SLDCs for Confirmation of LVRT and HVRT compliances of WTG/Inverters before first time charging of all new RE generators in the respective systems
9.4. Monsoon preparedness:
India Meteorological Department (IMD) had issued long range forecasts for the southwest monsoon season (June-September) rainfall over the country as a whole on 16th Apr 21. The highlights are quoted below
Quote
“Southwest monsoon seasonal (June to September) rainfall over the country as a whole is most likely to be NORMAL (96% to 104% of long period average (LPA)). Quantitatively, monsoon seasonal(June-September) rainfall is likely to be 98% of the LPA with a model error of ±5%. Neutral ENSO conditions are prevailing over the Pacific Ocean and Neutral Indian Ocean Dipole(IOD) condition are prevailing over the Indian ocean. The latest global model forecast indicates ENSO conditions are likely to continue over the equatorial Pacific and negative IOD conditions are likely to develop over the Indian ocean during the ensuing monsoon season”
541th OCC Agenda Page 14
Unquote
The above forecast is issued by IMD on 16th Apr 2021.The updated forecast will be issued by IMD the last week of May, 2021. During monsoon, demand of WR and its constituents would be less when compared to other seasons and in past persistent high voltages are observed at several 400 kV and 765 kV nodes during of peak hours. Due to high wind penetration MVAR inflow from LV to HV side was also observed at some of the 400 kV nodes. The actual demand of constituents in June-Sep is tabulated below:
Constituent Daily Energy Peak Demand Consumption in MUs in MW (Jun-Sep 20) (Jun-Sep 20)
Maharashtra 284-425 9423-19422
Gujarat 219-343 8473-15924
Madhya 143-232 5335-10169 Pradesh Chhattisgarh 56-110 1983-4569
Goa 7-11 206-541
DNH 7-19 263-790
DD 3-7 61-334
The following aspects may be reviewed: Establishing pumping mode operation of SSP(Last discussed in 496, 512 and 519 OCC meeting). NCA may give update to OCC members. Revival of LRs and BRs under prolonged outage MVAR absorption by generating units Running maximum hydel units in condenser mode at Koyna IV, Ghatghar and Tata Hydel stations, Bhira, Bhivpuri and Khopoli.
541th OCC Agenda Page 15
Limiting reactive power inflow from LV to HV side Revised short term demand forecast of the State Intraday forecast of wind and solar generation and monitoring of net load Monitoring of backing down margins and maintaining adequate generation on bar to handle both off-peak and peak demands Maintaining adequate reserves to handle sudden loss of generation Review of outages of transmission elements Review of preventive maintenance activities of transmission and generating elements Available coal stock in thermal power stations and measures being taken to ensure adequate fuel availability Availability/ Water level in reservoir hydro (Koyna, SSP, Kadana, Ukai and Bargi etc.) Import transfer capability of States All SLDCs and generators to apprise the committee regarding the actions being implemented with regard to the above mentioned aspects.
OCC Sub Committee may discuss.
9.5. Ramping capability assessment data:
Ramp Performance assessment of WR Thermal Power Stations(NTPC Gadarwada, Khargone, Korba, Sipat, Mouda, Solapur, Vindhyanchal and NSPCL) for FY-2020-21 computed based on “Revised Detailed Guidelines for Assessment of Ramping Capability” of Inter-State Generating Stations is submitted to WRPC on 05.05.21.The Generators mentioned above have also been informed about Ramp Performance assessment of WR Thermal Power Stations and comments received from them have already been incorporated. (Annexure-9.5).
The Sub committee may note the same.
541th OCC Agenda Page 16
9.6. Low Voltage issue at Solapur Maharashtra:
The Voltage at 400kV Solapur (M) has been observed to be below 395kV for most of the time during the month of April,2021 and in particular, the voltage has been below 390kV between 10:30hrs to 16:30hrs. Despite the Bus reactors and Line reactors at 765/400kV Solapur PG have been switched off, the Voltage profile at Solapur(M) has been continued to be below 395kV in the day hours. The total MVAR drwal at Solapur (M) on ICTs from 400kV side has been around 250MVAR during day hours. The Voltage profile for the period 04.04.2021 to 10.04.2021 at Solapur(M) is shown below.
Maharashtra may apprise the OCC regarding:
1. Actions being taken to improve the Voltage profile at Solapur (M) 2. Proposed/envisaged network augmentation near Solapur area like installing Capacitor banks/load shifting/load staggering etc. Temporary reconfiguration of existing network to improve Voltage profile. Maharashtra to explore the possibilities and apprise the OCC with study results.
OCC Sub Committee may discuss.
541th OCC Agenda Page 17
9.7. Status of submission of DR/EL by utilities for the Grid events and Inter Regional line tripping in Apr’21
Sl Station Time/Da No Event description Remarks name te .
At 12:14 Hrs on 08-04-21, 220kV Bhuj Bus- 2B tripped on bus bar protection on R-E fault due to contact of foreign material with the bus (heavy wind reported by site) which resulted in tripping of 400/ 220kV Bhuj ICT - 2 and 220kV Bhuj- Dayapar. Also, 220KV Dayapar 12:14 / 765 kV Bhuj - Alfanar (connected to line DR not 1 08-04- Bhuj ss Bus section 2C at Bhuj S/S) submitted 2021 tripped at Alfanar end and by INOX 220kV Bhuj - Naranpar (connected to Bus section 2A at Bhuj S/S) tripped at Naranpar end . Due these trippings, generation loss of 57 MW( 30 MW at Naranpar, 15 MW at Dayapar and 12 MW at Alfanar) occurred.
At 12:16 Hrs on 08-04-21, 220 kV DGBP-Kasor 1 tripped on B- E fault. After this tripping 220/132 kV 100 MVA DGBP ICT became overloaded and DGBP end 12:16 / resulted in LTS operation and 220 kV DRs not 2 08-04- tripping of 132 kV DGBP- DGBP submitted 2021 Dhanduka 1&2. At 12:24 Hrs, 220 kV DGBP-Kasor 2 by GSECL autoreclosed sucessfully on B-E fault. During the A/R of the line, 220/132 kV 100 MVA DGBP ICT and 220 kV Bus coupler tripped on B/U Over
541th OCC Agenda Page 18
current protection operation. This resulted in tripping of DGBP Unit 3 on Over frequency protection operation due to the loss of evacuation path.
220 kV Bhanpura, Swasra, Nipaniya end Line DRs not At 12:39 Hrs/10-04-21, 220 kV submitted 12:39 / Bhanpura Bus tripped on bus 220 kV by 3 10-04- bar protection operation due to Bhanpura MPPTCL. 2021 R phase PT failure and all the 220/132 connected elements tripped. kV Bhanpura ICT 1 DR not submitted by MPPTCL
At 18:47 Hrs on 10-04-21, 220 kV Chhuri-Bishrampur 2 tripped on R-E fault. Prior to this tripping, 220 kV Chhuri- 220 kV Bishrampur 1 tripped on B-E Chhuri- 220 kV 18:47 / fault at 17:52 Hrs. With these Bishrampu 4 Bishramp 10-04- tripping, total interruption r 1&2 DRs ur 2021 occurred at 220/132 kV not Bishrampur s/s & 132 kV submitted Ambikapur,Batoli,Udaipur, by CSPTCL Wadrafnagar,Rajpur, Balrampur And Pratappur substations.
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Koyna Units DR not submitted At 15:39 Hrs on 12-04-21, 400 by MSPGCL kV Koyna IV - Lonikhand and 400 kV 15:39 / 220 kV Lonikhand-Khatapur 400 kV Koyna IV- 5 12-04- tripped on R-E fault. During the Koyna IV Lonikhand 2021 tripping of these lines, 250 MW & 220 kV Koyna StageIV Units 2&3 also Lonikhand- tripped. Khatapur DRs not submitted by MSETCL
At 12:36 Hrs/27-04-21, While 400 kV closing Isolator of Wanakbori Wanakbori- GT-5, 400 kV Wanakbori- Wanakbori Wanakbori I/C 1&2 tripped on I/C 1&2 400 kV 12:36 / B/U Earth fault protection DR and 6 Wanakbo 27-04- operation due to sparking in R Wanakbori ri 2021 phase isolator. After the Unit 8 DR tripping of I/C 1&2, Wanakbori not Unit 8 tripped due to loss of submitted evacuation path. by GSECL
At 19:48 Hrs on 29-04-21, 400 kV Akola Bus 1 tripped on BB protection operation due to sparking in 410 89A Bphase (Main Bay) isolator of 400 kV 400 kV Akola Bhusawal line. 400 kV Akola, Akola-Akola(2) 1&2 should have Bhusawal 19:48 / & 400 kV been remained in service 7 29-04- Nandgaonp Akola through tie bays but tie bays 2021 tripped during the event and eth end resulted in tripping of these DRs not lines. 400 kV Akola- submitted Nandgaonpeth & 400 kV Akola- by MSETCL Bhusawal also tripped as the tie bays were already in open condition due to the outage of 400 kV Akola-Wardha 1&2 for
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diversion works.
At 23:05 Hrs on 29-04-21, R- Phase CT of 132 KV Narsinghpur- Barman 2 blasted at Narsinghpur s/s resulting in tripping of all the elements connected to 132 kV Narsinghpur Bus. After the 132 kV tripping of 220/132 kV ICTs 1, Narsinghpu 2 & 3 at 220 KV S/s r, Barman, Narsinghpur, due to load Gadarwara, shifting 220 kV/132 kV Chichli 132 kV 23:05 / Chichli, ICT , 132 kV Pipariya – 8 Narsingh 29-04- Jabalpur, Bankhedi, 132 kV Chichli – pur 2021 Pipariya Udaipura and 132 KV Jabalpur end DRs – Shahpura tripped on Backup not O/C protection operation. Load submitted served by 220 kV Chichli & by MPPTCL Narsinghpur s/s, 132 kV Shahpura, Shrinagar, Barman, Gadarwara, Karakbel, Belkheda, Palohabada, Pondar, Bankhedi, Devnagar and Karapgaon substations affected due to the event.
At 20:00 hrs on 30.04.2021 while withdrawing SSP CHPH Unit-5 as per schedule, its Y- phase circuit breaker didn’t SSP end 220 kV 20:00 / open due to which bus bar DRs not 9 SSP 30-04- protection operated and 220 KV submitted CHPH 2021 Bus-2 at SSP CHPH tripped by NCA along with 50 MW Unit-2 and 220 kV SSP CHPH-RBPH 2.
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INOX (one event), GSECL(two events), MSETCL(two events), MSPGCL(one event), MPPTCL(two events), NCA (one event) and CSPTCL (one event) may kindly submit the DR at the earliest.
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OCC Sub Committee may discuss/note.
9.8. Ensuring Uninterrupted Electricity to Oxygen Generating Plants It is observed that in current Covid-19 pandemic there has been high requirement of oxygen generation. Ensuring of uninterrupted electricity supply to oxygen generating plants is very essential and crucial at this juncture. Secretary (Power), MoP directed RPCs/RLDCs to provide uninterrupted supply to oxygen generating plants and to monitor power supply position on daily basis.
In this regard a list of oxygen generating plants in WR to be monitored on daily basis has been circulated to SLDCs. SLDCs are requested to communicate to respective transmission companies and DISCOMs to ensure continuous supply to these oxygen generating plants. SLDCs were also requested to communicate the status of power supply position to listed oxygen generating plants to WRPC/WRLDC on daily basis for onward submission to MoP.
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To ensure continuity of supply to oxygen generating plants, WRLDC had made the following advisories to SLDCs/Transmission companies/DISCOMs/Oxygen plants
SLDCs:
1. To ensure supply to oxygen generating plants while facilitating planned outages. 2. Defer planned outages which affecting power supply to oxygen generating plants 3. Restore the forced outages affecting power supply to oxygen generating plants on war foot basis. 4. Firm control of voltages within thresholds at Grid substations wherein oxygen generating plants are connected directly/nearby 5. Feeders connected to oxygen plant if included in any LTS / AUFLS / SPS to be excluded immediately. 6. Always ensure alternate source to supply to oxygen generating plants 7. During grid events if load interruption comprises of any oxygen generation plant, the same to be intimated Transmission Utilities & DISCOMs:
1. All planned shutdowns of major lines affecting power supply to oxygen generating plants to be rescheduled 2. Under voltage, over voltage settings and any other protection settings of lines feeding oxygen generating plants may be checked/reviewed to avoid spurious trippings. 3. Proper maintenance to be done to avoid any untoward trippings leading to interruption at oxygen generating plants 4. Higher level of alertness across the oxygen generation plant connected substations to monitor and to take care of any untoward incident. 5. Availability & healthiness of spares, synchronizing facilities, and availability of the required manpower round the clock at substations 6. Adequate steps to prevent complete substation forced outage in case of unforeseen fault tripping’s/security threats. Oxygen Generating Plants:
1. Under voltage settings, over voltage settings and any other protection settings at plant to be reviewed if required 2. Healthiness of relays/panels to be ensured 3. Healthiness of DG sets to be ensured 4. Alternate source of feed to plant to be arranged/to be identified At present power supply position of 20 oxygen generating plants in WR are monitored on daily basis and forwarded to NLDC/MoP. The details of plants are tabulated below. A template for technical audit of power supply of each oxygen plant has been circulated to SLDCs to assess the nature of power
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supply, the sources of power supply, availability of alternative arrangements, relay settings, etc. The template for technical audit is enclosed as Annexure- 9.8.
Captive S.N plant/Grid Interruption reported o Name of the Plant State Connected from 1st May 2021
Jindal Steel & Power Chhattisg - 1 Ltd Raigarh arh Captive plant
LINDE SAIL- Bhilai Chhattisg - 2 Captive plant arh Captive plant
SAIL Bhilai Captive Chhattisg - 3 plant arh Captive plant
Jindal Steel Works Maharash Grid - 4 (JTPML) Dolvi, Raigad tra connected
Taiyo Nippon Sanso, Maharash Grid - 5 Pune tra connected
Maharash Grid - 6 Air Liquide, Pune tra connected
Kolhapur Oxygen & Maharash Grid - 7 Acetylene tra connected
Inox Vile Bhagad, Maharash Grid - 8 Raigad tra connected
Maharash Grid - 9 Inox Dolvi, Raigad tra connected
Maharash Grid - 10 Inox Chakan, Pune tra connected
Maharash Grid - 11 Inox Butibori (Nagpur) tra connected
Maharash Grid - 12 LINDE Murbad, Thane tra connected
Maharash Grid - 13 LINDE Taloja, Raigad tra connected
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Grid - 14 Shree Ram Oxy Gases Gujarat connected
Reliance Industries Ltd, - 15 Jamnagar Gujarat Captive plant
Grid - 16 Air Liquide, Jhagadia Gujarat connected
Grid - 17 Inox Karjan Gujarat connected
18 Inox Hazira Gujarat Captive Plant -
Grid - 19 Inox Simej Gujarat connected
Grid 11-05-21 at 16:12 Hrs 20 LINDE Dahej Gujarat connected
SLDCs are requested to intimate supply disruption and event details at these plants. All the available details were being submitted by SLDCs to WRLDC on daily basis.
In view of above SLDCs may apprise OCC the following
1. Actions being taken to ensure reliable supply to oxygen generating plants 2. Follow up actions being taken to arrange alternate source of supply to oxygen generating plants 3. Necessity of reviewing protection settings at plants or lines feeding plants.
OCC Sub Committee may discuss.
Item No. 10: Date of the next OCC meeting. Date of 542th OCC meeting may be decided by members.
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Anaulagnak 2.1
अ ैल 2021 maoM AavaRi%t ko AaMkD,aoM ka ivavarNa (piScama xao~ Baar p`oYaNa kond` kI AavaRi%t irpaoT- ko AaQaar pr) FREQUENCY PARTICULARS DURING April 2021 (AS PER FREQUENCY REPORT OF WRLDC) 1. INTEGRATED OVER AN-HOUR ek GaMTo maoM samaakilat
1.1 MAXIMUM FREQUENCY 50.10 Hz Between 17 and 18 Hrs on 29th AiQaktma AavaRi%t
1.2 MINIMUM FREQUENCY 49.83 Hz Between 22 and 23 Hrs on 17th nyaUnatma AavaRi%t
1.3 AVERAGE FREQUENCY 50.00 Hz. AaOsat AavaRi%t 2. INSTANTANEOUS ta%kailak
2.1 MAXIMUM FREQUENCY 50.30 on 04th Apr. at 18:01:10 hrs AiQaktma AavaRi%t
2.2 MINIMUM FREQUENCY 49.69 on 11th Apr at 21:07:40 hrs nyaUnatma AavaRi%t
3. %AGE OF TIME WHEN FREQUENCY WAS अ ैल 2021 माच 2021 फरवरी 2021 AavaRi%t ka samaya p`itSat maoM
3.1 Below 49.9 Hz. 7.96 7.14 7.12 49.9 hT\ja sao kma 3.2 BETWEEN 49.9 Hz. AND 50.05 Hz. 74.94 72.75 76.26 49.9 hT\ja AaOr 50.05 hT\ja ko baIca mao 3.3 ABOVE 50.05 Hz. 17.11 20.11 16.62 50.05 hT\ja ko ऊपर 4.1 NO. OF TIMES FREQUENCY TOUCHED 49.20 Hz. 0 0 0
4.2 NO. OF TIMES FREQUENCY TOUCHED 49.00 Hz. 0 0 0
4.3 NO. OF TIMES FREQUENCY TOUCHED 48.8 Hz. 0 0 0
Annexure-2.1B piScama xao~Iya ivaVut saimait ef 3, ema Aa[- DI saI xao~, AMQaorI pUva-, mauMba[- 400 093
FROM : SUPERINTENDING ENGINEER (OPERATION),WRPC,MUMBAI. Date: 18-05-2021 TO : CHIEF ENGINEER (GRID MANAGEMENT),CEA,NEW DELHI.(FAX NO.011-26109750)
HIGHLIGHTS OF THE POWER SUPPLY POSITION OF WESTERN REGION Revised FOR THE MONTH OF April 2021 File no: WRPC/Opn./PSP/2019-20/ (A) GENERATION DETAILS OF WESTERN REGION
HVDC CONSTITUENT GUVNL MPPGCL CSEB MSPGCL GOA DAMAN DNH ESIL&BARC DRAWAL WESTERN & DIU REGION (1) GENERATION GROSS (MUs) Thermal Coal+Gas Based 7093.73 1986.65 1682.06 9597.49 16.83 0.00 0.00 0.00 0.00 20376.75 Hydro 86.97 431.84 42.55 713.26 0.00 0.00 0.00 0.00 0.00 1274.62 Wind Injection 737.27 333.23 0.00 405.87 0.00 0.00 0.00 0.00 0.00 1476.37 Solar Injection 495.38 267.34 28.43 240.77 0.00 0.13 0.00 0.00 0.00 1032.05 Bio Mass Injection 0.00 24.53 16.57 0.00 0.00 0.00 0.00 0.00 0.00 41.10 TOTAL 8413.35 3043.60 1769.61 10957.38 16.83 0.13 0.00 0.00 0.00 24200.89
(2) ACTUALDEMAND MET (GR. MW ) 19360 11392 4787 25644 605 344 847 884 60966
(B) ENERGY AVAILABILITY/ REQUIREMENT ETC.(EX-BUS) IN (MUs)
HVDC CONSTITUENT GUVNL MPPGCL CSEB* MSPGCL GOA DAMAN DNH ESIL&BARC DRAWAL WESTERN & DIU REGION 1. OWN GEN Thermal Coal+Gas Based 6558.12 2070.38 1305.95 9158.85 16.50 0.00 0.00 0.00 0.00 19109.79 Hydro 86.55 428.75 41.79 706.83 0.00 0.00 0.00 0.00 0.00 1263.93 Wind Injection 722.53 333.23 0.00 397.75 0.00 0.00 0.00 0.00 0.00 1453.51 Solar Injection 485.47 267.34 27.01 235.95 0.00 0.13 0.00 0.00 0.00 1015.90 Bio Mass Injection 0.00 24.53 16.57 0.00 0.00 0.00 0.00 0.00 0.00 41.10 Total 7852.67 3124.23 1391.32 10499.38 16.50 0.13 0.00 0.00 0.00 22884.22 2 (I).Total drawl from ISTS Grid (at 4505.82 3775.37 1679.07 5051.79 349.34 227.74 608.39 56.15 2.64 16256.31 State Peripheri Excluding Tr. 2Losses) (II) B.Total drawl from ISTS Grid ( 4665.38 3909.06 1738.53 5230.68 361.71 235.81 629.93 58.14 2.74 16829.22 Including Tr. Losses)
3. NET IMPORT 0.00 0.00 0.00 0.00 55.31 0.00 0.00 0.00 0.00 55.31 4. NET EXPORT 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 TOTAL AVAILABILITY (EXC ISTS TRANS. LOSSES) / TOTAL AVAILABILITY / NET ACTUAL ENERGY SUPPLIED (INC. ISTS TRAN.LOSSES)
5 (I) . TOTAL AVAILABILITY (EXCL. ISTS TRANS. LOSSES) 12358 6900 3070 15551 421 228 608 56 2.64 39195.84 5 (II). TOTAL AVAILABILITY / NET ACTUAL ENERGY SUPPLIED (INCL ISTS TRANS. LOSSES) 12518.04 7033.29 3129.84 15730.06 433.51 235.94 629.93 58.14 2.74 39768.76 6. SHORTFALL 6 (I). SHORTFALL (MU) 0.00 0.00 1.17 0.02 0.00 0.00 0.00 0.00 0.00 1.19 6 (II). SHORTFALL (%) 0.00 0.00 0.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Freq. correction 0.00 0.00 0.01 0.02 0.00 0.00 0.00 0.00 0.00 0.04 Un Sch.Load Shedding 0.00 0.00 1.15 0.00 0.00 0.00 0.00 0.00 0.00 1.15 Sch.Load Shedding 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 7. Unrestricted Requirment 12358 6900 3072 15551 421 228 608 56 2.64 39197
AVERAGE WR GRID POOL LOSS 3.42
(C) DEMAND AVAILABILITY/UNRESTRICTED REQUIREMENT IN (MW)
1. REQUIREMENT 19360 11392 4792 25653 614 344 847 884 4 60966 2. AVAILABILITY 19360 11392 4787 25644 605 344 847 884 4 60966 3. SHORTFALL 0.00 0.00 5.03 8.98 8.77 0.00 0.30 0.00 0.00 0.00 4. % SHORTFALL 0.00 0.00 0.10 0.03 1.43 0.00 0.03 0.00 0.00 0.00 The details of calculations for Unrestricted Requirment Demand met at Unrestricted max 19360 11392 4787 25644 605 344 847 884 4 60966 Freq. correction 0 0 5 9 1 0 0 0 0 0 Un Sch.Load Shedding 0 0 0 0 8 0 0 0 0 0 Sch.Load Shedding 0 0 0 0 0 0 0 0 0 0 Unrestricted Demand 19360 11392 4792 25653 614 344 847 884 4 60966 Min. Registered Demand 13595 5561 2664 18876 40601 (D) Details of Gross generation, Declared Capacity, Scheduled generation & Injection from CS and dedicated Stations
C.S. Station & Gross Injection Dedicated Stations Generation (MUs) (MUs) Korba 1476.09 1402.29 Korba-III 357.41 339.54 Vindhyachal-I 804.09 763.88 Vindhyachal-II 706.43 671.11 Vindhyachal-III 676.45 642.63 Vindhyachal-IV 718.50 682.58 Vindhyachal-V 355.97 338.17 Kawas 9.26 9.07 Gandhar 73.54 72.07 Sipat I 1162.55 1116.05 Sipat II 674.71 647.72 MAUDA-I 665.93 639.29 MAUDA-II 745.39 715.57 Lara 1114.11 1069.54 Gadarwada 974.27 935.30 SOLAPUR 510.66 485.13 NSPCL 333.95 320.59 RGPPL 324.81 318.31 Kakrapar 152.15 142.57 Tarapur II (3&4) 698.22 642.36 Tarapur I (1&2) -1.80 -1.64 SSP 174.75 173.01 OTHER IPPS 13233.79 12439.76 Pench 8.16 8.04 Total 25949.40 24572.95
(F) Total Drawal by the Constituents
Constituents Actual total drawal from grid excluding grid loss (MUs) GUJARAT 4505.82 MADHYA PRADESH 3775.37 CHHATISHGARH 1679.07 MAHARASHTRA 5051.79 GOA(WR) 349.34 DD 227.74 DNH 608.39 ESIL 53.13 BARC 3.02 HVDC DRAWAL 2.64 TOTAL 16256.31
(G) FREQUENCY REGIME OF WESTERN REGION GRID
1.Intantaneous (Hz) 2. Integrated (Hz) 3. Average (Hz) Maximum Freq. 50.30 50.10 50.00 Munimum Freq. 49.69 49.83
3. Percentage Time when the Frequency was 4. No of Occasions when Frequency was 3.1 Below 49.9 Hz. 7.96 4.1 NO. OF TIMES FREQUENCY TOUCHED 0.00 3.2 BETWEEN 49.9 Hz. AND 50.05 Hz. 74.94 4.2 NO. OF TIMES FREQUENCY TOUCHED 0.00 3.3 ABOVE 50.05 Hz. 17.11 4.3 NO. OF TIMES FREQUENCY TOUCHED 0.00 Net Import / export of Energy in the Region Actual Energy import (MU) -8922 Sch Energy import (MU) -8839 व युतदाब परेखा अ लै 2021 Voltage Profile during the month of Apr'2021 सं नक Annex-2.3