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NRLDC, NEW DELHI Dated : 11 th March, 2004

PRESENTATION ON FREE GOVERNOR MODE OF OPERATION TO THE OFFICERS OF BHARAT HEAVY ELECTRICALS LIMITED. NRLDC, NEW DELHI Dated : 11 th March, 2004. PRESENTATION ORGANISATION. GRID OPERATION AND CONTROL STIPULATIONS IN IEGC ABOUT FGMO COMMERCIAL MECHANISEM

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NRLDC, NEW DELHI Dated : 11 th March, 2004

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  1. PRESENTATION ON FREE GOVERNOR MODE OF OPERATIONTO THE OFFICERS OF BHARAT HEAVY ELECTRICALS LIMITED NRLDC, NEW DELHI Dated : 11th March, 2004

  2. PRESENTATION ORGANISATION • GRID OPERATION AND CONTROL • STIPULATIONS IN IEGC ABOUT FGMO • COMMERCIAL MECHANISEM • FGMO – A CASE STUDY IN NORTHERN REGION • LIMITATIONS – AS EXPRESSED BY GENRATORS

  3. GRID OPERATIONANDCONTROL

  4. Indian Power Grid – its Evolution • Phenomenal expansion since Independence • Generation : 1349 MW 105,800 MW (in 1947) (in 2003) • Grid : Local grid – at the time of Independence. State Grids – emerged in 1960s. Regional Grids – in 1970s. Five Regional Grids – Northern, Western, Southern, Eastern & North-eastern National Grid – All Five Regions Interconnected (2002)

  5. STIPULATIONS IN REGARD TO FREE GOVERNOR MODE OF OPERATION(FGMO) AS STATED ININDIAN ELECTRICITY GRID CODE(IEGC)

  6. EXTRACTS FROM INDIAN ELECTRICITY GRID CODE Section 6.2(e) “ All generating units which are synchronized with the grid, irrespective of their ownership, type and size, shall have their governors in normal operation at all times. If any generating unit of over fifty (50) MW size (10 MW for North Eastern region) is required to be operated without its governor in normal operation, the RLDC shall be immediately advised about the reason and duration of such operation. All governors shall have a droop of between 3% and 6%.”

  7. EXTRACTS FROM INDIAN ELECTRICITY GRID CODE Section 6.2(f) “Facilities available with/in load limiters, Automatic Turbine Run up System (ATRS), Turbine Supervisory control, coordinated control system, etc. shall not be used to suppress the normal governor action in any manner. No dead bands and/or time delays shall be deliberately introduced.”

  8. EXTRACTS FROM INDIAN ELECTRICITY GRID CODE Section 6.2(g) “All generating units, operating at/up to 100% of their Maximum Continuous Rating (MCR) shall normally be capable of (and shall not in any way be prevented from) instantaneously picking up five percent (5%) extra load for at least five (5) minutes or within technical limits prescribed by the manufacturer when frequency falls due to a system contingency. The generating units operating at above 100% of their MCR shall be capable of (and shall not be prevented from) going at least up to 105% of their MCR when frequency falls suddenly.” “Any generating unit of over fifty (50) MW size (10MW for NER) not complying with the above requirement, shall be kept in operation (synchronized with the grid) only after obtaining the permission of RLDC.

  9. EXTRACTS FROM INDIAN ELECTRICITY GRID CODE Section 6.2(h) “The recommended rate for changing the governor setting, i.e. supplementary control for increasing or decreasing the output (generation level) for all generating units, irrespective of their type and size, would be one(1.0) percent per minute or as per manufacturer’s limits. However if the frequency falls below 49.5 Hz, all partly loaded generating units shall pick up additional load at a faster rate according to their capability.”

  10. STIPULATIONS IN IEGC REGARDINGDATE OF IMPEMENTATION OFFREE GOVERNOR MODE OF OPERATION(FGMO)

  11. EXTRACTS FROM INDIAN ELECTRICITY GRID CODE Section 1.6 The dates from which the stipulations under sections 4.8(c), 4.8(d), 6.2(e), 6.2(f), 6.2(g) and 6.2(h) would come into effect shall be the date for implementation of the Commercial mechanism for • All generating units of installed capacity 200 MW and above and reservoir based hydro units of installed capacity 50 MW and above in SR, ER, NR & WR. • All thermal and reservoir based hydro generating units of installed capacity 10 MW and above in North Eastern Region.

  12. EXTRACTS FROM INDIAN ELECTRICITY GRID CODE Section 1.6 (contd.) For all other generating units the date of implementation of stipulations under section 4.8(c), 4.8(d), 6.2(e), 6.2(f), 6.2(g) and 6.2(h) would be three months after the date of implementation of the Commercial mechanism (ABT)

  13. COMMERCIAL MECHANISEMFOR GRID OPERATION & CONTROLi.e.AVAILABILITY BASED TARIFF(ABT)

  14. Components of inter-utility tariff(Pre – ABT Mechanism) • Fixed charges • Interest on loans • Depreciation • O & M charges • Return on equity • Interest on Working Capital • Energy charges (fuel cost) • Incentives • Surcharge & other levies • No charge for reactive energy

  15. TENTATIVE COST FOR NTPC THERMAL STATIONS FOR THE MONTH OF DEC 2003 *Rates for mixed fuel (gas+ liquid fuel, naphtha)

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

  17. Energy Charges (paise/kwh) for Central Sector stations (Dec 2003)

  18. UI PRICE AND FREQUENCY 448 49 HZ 420 392 364 336 49.5 HZ CORRESPONDS TO RS.2.80 308 49.5 HZ 280 252 224 PAISE/UNIT 196 168 50 HZ 140 112 84 56 28 50.5 HZ 0 51 50 49 50.9 50.8 50.7 50.6 50.5 50.4 50.3 50.2 50.1 49.9 49.8 49.7 49.6 49.5 49.4 49.3 49.2 49.1 48.9 48.8 48.7 48.6 48.5 FREQUENCY FREQUENCY vs UI PRICE

  19. IMPROVEMENTS AFTER THE IMPLEMENTATION OF AVAILABILITY BASED TARIFFIN NORTHERN REGION

  20. Singrauli & Rihand Dadri (T) 2700 800 Declared Capability Injection schedule Declared Capability Injection Schedule 2555 711 750 717 2530 2600 2505 2491 700 2500 640 619 Average MW Average MW 650 2400 600 2300 550 2200 500 Pre ABT(Dec 01-Nov 02) Post ABT(Dec 02-Nov 03) Post ABT(Dec 02-Nov 03) Pre ABT(Dec 01-Nov 02) Unchahar-1 & 2 Anta, Auraiya & Dadri 750 1800 Declared Capabilty Injection Schedule Declared Capability Injection Schedule 691 1636 687 1700 700 653 1600 1478 650 1500 Average MW Average MW 599 1336 1330 1400 600 1300 550 1200 1100 500 Pre ABT(Dec 01-Nov 02) Post ABT(Dec 02-Nov 03) Post ABT(Dec 02-Nov 03) Pre ABT(Dec 01-Nov 02)

  21. NR BILATERAL AGREEMENTS

  22. FREE GOVERNOR MODE OF OPERATION CASE STUDY FOR NORTHERN REGION

  23. EXTRACTS FROM MINUTES OF NREB BOARD MEETING HELD AT SHIMLA ON 14th JUNE 2003 “Northern Regional Electricity Board endorsed the decision of Technical Coordination Committee (TCC) to implement free governor mode of operation (FGMO) from 0000 hrs of 1st Oct, 2003”

  24. UNIT SIZE & GOVERNING SYSTEM

  25. FREQUENCY RESPONSEEXHIBITED BY VARIOUS GENERATING UNITS DURING RISE IN FREQUENCY

  26. RESPONSES OBSERVED FOR 500 MW THERMAL UNITSHAVING ELECTROHYDRAULIC GOVERNING SYSTEMWITH COORDINATED CONTROLS(For Frequency Rise)

  27. RESPONSES OBSERVED FOR210/250 MW THERMAL UNITSHAVINGELECTROHYRAULIC GOVERNING SYSTEM WITH COORDINATED CONTROLS(For Frequency rise)

  28. RESPONSES OBSERVED FOR210 MW THERMAL UNITSHAVING ELECTROHYRAULIC GOVERNING SYSTEMWITHOUT COORDINATED CONTROLS(For Frequency rise)

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