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NORTHERN REGIONAL POWER SYSTEM

The Northern Regional Power System is the largest in geographical area among the five regions of India, covering 30.7% of the area and approximately 29.9% of the country's population. It has the largest number of participating constituents and a significant transmission system. With an effective generation capacity of 28,794 MW, the system ensures reliable power supply to the region. The system operates under the Availability Based Tariff mechanism, ensuring fair payment to Inter State Generating Stations (ISGS). The system also implements Unified Load Despatch & Communication (ULDC) schemes to optimize grid operations and enhance security.

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NORTHERN REGIONAL POWER SYSTEM

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  1. NORTHERN REGIONAL POWER SYSTEM

  2. NORTHERN REGIONAL GRID

  3. Salient Features Northern Regional Power System • Largest in geographical area amongst the five regions of India covering 30.7% of the area and approx 29.9% of the country’s population . • Largest number of participating constituents (9 states, 5 Central generating companies, one Central Transmission Utility and Bhakra Beas Management Board).

  4. Salient Features Northern Regional Power System Effective generation capacity 28794 MW Regional Peak Met 23015 MW Average Energy Consumption 425 MU/ day Central --39.4%, BBMB—9.9%, State—50.3%

  5. Salient Features Northern Regional Power System Transmission system + 500 kV HVDC 1630 Ckt. Kms. 15033 Ckt. Kms. 400 kV 220 kV 28353 Ckt. Kms. TOTAL 45016 Ckt. Kms.

  6. Salient Features Northern Regional Power System • Largest Generating Stations • Thermal (coal fired) SSTPS(NTPC) 2000 MW • Hydro Bhakra Complex (BBMB) 1493 MW • Nuclear RAPS Complex (NPC) 740 MW • Thermal (gas fired) Dadri Gas (NTPC) 829.78 MW

  7. 2002 STATISTICS (PRE ABT)

  8. COMMERCIAL MECHANISM

  9. Payment to Inter State Generating Stations (ISGS) from beneficiaries under Availability Based Tariff (ABT) • Capacity charges • Energy charges • Unscheduled Interchange (UI)

  10. CAPACITY CHARGE Capacity charge will be related to ‘availability’ of the generating station and the percentage capacity allocated to the state. ‘Availability’ for this purpose means the readiness of the generating station to deliver ex-bus output expressed as a percentage of its rated ex-bus output capability.

  11. ENERGY CHARGE Energy charges shall be worked out on the basis of a paise per kwh rate on ex-bus energy scheduled to be sent out from the generating station as per the following formula Energy charges = Rate of energy charges (paise/kwh) x ScheduledGeneration (ex-bus MWh)

  12. UNSCHEDULED INTERCHANGE (U I) : • Variation in actual generation / drawal with respect to scheduled generation / drawal shall be accounted for through Unscheduled Interchange (UI). • UI for generating station shall be equal to its total actual generation minus its scheduled generation. • UI for beneficiary shall be equal to its total actual drawal minus its total scheduled drawal.

  13. UNSCHEDULED INTERCHANGE (UI) RATES

  14. UNSCHEDULED INTERCHANGES (UI)I.E. DEVIATIONS FROM SCHEDULES • Makes all the players in the grid self-responsive and enhances merit order. • Good UI helps in improving frequency and enables one constituent to help the other (for meeting more consumer demand i.e reducing load shedding) • UI provides the mechanism for on-line displacement of costlier generation by cheaper generation : ultimate optimisation.

  15. REACTIVE ENERGY CHARGES • Under ABT, a reactive energy charge in paise/kwh is applicable. • The charges would be @ 4.0 paise/kVARh upto 31st March 2001 and escalated @ 5% per annum. • This would be applicable for reactive power exchanges outside the 97-103% voltage band.

  16. MODERNISATION OF POWER SYSTEM OPERATION ULDC SCHEME

  17. UNIFIED LOAD DESPATCH & COMMUNICATION (ULDC) SCHEMES POWERGRID is implementing ULDC schemes in all the five regions with state of the art SCADA Energy Management System and Dedicated Communication System

  18. ULD & C PROJECT: OBJECTIVES • To have • Greater and deeper visibility of the power system under control • Better communication and co-ordination between control centers • Effective management of grid parameters viz. frequency, voltage etc. and better grid security through various SCADA/EMS features resulting in better • Operations scheduling • Operations monitoring and control • Power system analysis • A real time environment for dispatcher training

  19. SLDC SLDC SLDC SUB LDC SUB LDC SUB LDC RTU RTU RTU HIERARCHICAL SETUP NLDC 5 Nos. ERLDC NRLDC SRLDC NERLDC WRLDC 32 Nos. 51 Nos. 1160 Nos.

  20. H Himachal Pradesh Uttar Pradesh Madhya Pradesh UNIFIED LOAD DESPATCH & COMMUNICATION SCHEME (NORTHERN REGION) • HPSEB • 1 SLDC • 2 Sub-LDC • 16 RTUs • J&K SEB • 1 SLDC • 1 Sub-LDC • 16 RTUs Jammu & Kashmir • BBMB • 1 SLDC • 4 Sub-LDC • 21 RTUs Bemina F • PSEB • 1 SLDC • 2 Sub-LDC • 40 RTUs Gladni Hamirpur Jallandhar (B) Ganguwal (B) Jallandhar (P) Jutogh F Kunihar F F H F Chandigarh,BBMB F Punjab Laltonkalan Rishikesh • Uttaranchal • 1 SLDC • 27 RTUs H H H F ana Rishikesh F Patiala Panipat (BBMB) F H Narwana F Panipat(HSEB) • HVPNL • 1 SLDC • 2 Sub-LDC • 42 RTUs Hary F J DVB Dadri (B) Moradabad F F H F F F Delhi F Dadri (H) F Ratangarh • DVB • 1 SLDC • 4 Sub-LDC • 31 RTUs Rajasthan Panki Lucknow H H F F Heerapura F Sultanpur • RVPNL • 1 SLDC • 3 Sub-LDC • 79 RTUs Kota F F Varanasi F Bhilwara Gujarat • UPPCL • 1 SLDC • 4 Sub-LDC • 55 RTUs • RLDC • NEW DELHI • 36 RTUs CPCC KANPUR 6 RTUs SLDC Sub - LDC H F

  21. Control System Hierarchy For Northern Region RSCC Delhi RTUs - 36 SLDC UPSEB SLDC HVPNL SLDCPSEB SLDC RVPNL SLDCJ&K SLDCBBMB SLDC HPSEB SLDCDVB CPCCKanpur Sub-LDC (RTUs) Sub-LDC (RTUs) Sub-LDC (RTUs) Sub-LDC (RTUs) Sub-LDC (RTUs) Sub-LDC (RTUs) Sub-LDC (RTUs) Sub-LDC (RTUs) RTUs - 6 Moradabad (17) Panipat (12) Patiala (12) Heerapura ( 12) Gladini (8) Dadri (5) Hamirpur (8) Bawana (5) Bhilwara (29) Panki (13) Narwana (15) Jalandhar II (20) Bemina (8) Ganguwal (6) Kunihar (8) Bamanauli (12) Kota (11) Rishikesh (27) Dadri (14) Lalton Kalan (8) Jalandhar I (4) Gazipur (8) Ratangarh (12) Sultanpur (8) Panipat (5) Gopalpur (5) (RTU-L) Panipat Varanasi (16) (RTU-L) Chandigarh (RTU-L) Minto Road (RTU-L) Lucknow

  22. Unique Features of Northern Region ULDC Scheme • Three Level Hierarchical Control centres • More than ten electrical utilities involved • Highly Complex system First Time attempted in the world as a Single Project • Dedicated communication Infrastructure • Live Line Fibre Optic Cable Stringing • More than 30 control centres and 400 RTUs • Advance Despatcher training Simulator

  23. SUPERVISORY CONTROL & DATA ACQUISITION (SCADA) FUNCTIONS • RTU DATA ACQUISITION • SUPERVISORY CONTROL • DATA EXCHANGE • DATA PROCESSING (Alarms, SOE,Generalized calculations) • DISTURBANCE DATA COLLECTION • HISTORICAL INFORMATION STORAGE & RETRIEVAL (ISR)

  24. EMS FEATURES • OPERATION SCHEDULING • Load forecasting • Inflow forecasting • Unit commitment • Hydro scheduling • Hydro Thermal Coordination • Interchange scheduling • Current operating plan • Outage scheduling • LOAD GENERATION BALANCE • Operation monitoring • AGC • Economic despatch • Reserve monitoring • Loadshed /Restoration • Production costing • POWER SYSTEM ANALYSIS • Network Topology • State estimation • Contingency analysis • Optimal power flow • Transmission loss sensitivity factors • Post disturbance analysis

  25. Dispatcher Training Simulator • Primary use: • Training of Dispatchers for routine and emergency scenario in a controlled and safe off-line manner. • Network split, blackouts • Large voltage or frequency excursions • Engineering tool for operations planning (generation plans, network switching, etc..) and for understanding of power system behavior.

  26. Thank You

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