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Indian Experience in Large Grid Disturbances

Indian Experience in Large Grid Disturbances . By Y.K. Sehgal Executive Director, POWERGRID. Contents. Salient features Grid Incident- July 2012. It’s a Double Digit Growth Story !!. # Considering 9% GDP growth rate. 240 GW. Present Generation Capacity & Demand - 188 GW & 129 GW.

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Indian Experience in Large Grid Disturbances

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  1. Indian Experience inLarge Grid Disturbances By Y.K. Sehgal Executive Director, POWERGRID POSOCO

  2. Contents • Salient features • Grid Incident- July 2012

  3. It’s a Double Digit Growth Story !! # Considering 9% GDP growth rate 240 GW Present Generation Capacity & Demand - 188 GW & 129 GW ** Source- Planning commission report on IEP

  4. India’s Growth story- Generation • 240 GW • To be doubled in next ten years • 25 GW- Renewable • 40 GW being added • Advanced Renewable Energy Control Centre coming up • National report for integration POSOCO

  5. Upcoming Generation Pockets NER – 4000 MW Orissa – 20,000 MW Chattisgarh – 50,000 MW A. P. – 16,000 MW T. N. – 18,000 MW

  6. Increase in Transmission voltage Transmission 1200kV 800kV HVDC Voltage (kV) 765kV 500kV HVDC 400kV 220kV 1977 1990 2000 2012 2017-18 • 6000 ckt km of 765 kV AC, in operation • TCSC, FSC, SVC in operation • 1200 kV UHVAC test station/line commissioned • Several Gas Insulated Substations existing

  7. Power Transmission Highways planned Planned 765 kV 30,000 ckt km 2000 km + 800 kV Multi-polar HVDC under construction Nine corridors To take care of Uncertainties Intermittent flows Cluster of Concentrated Demand pockets Cluster of Generation pockets

  8. A Vibrant Electricity Market Operating in India NLDC - POSOCO

  9. Reforms in Transmission Pricing

  10. Synchrophasor initiative Existing 13 PMUs 3 PDCs 1700 PMUs Coming up POSOCO

  11. Grid Incident in IndiaRecent- 30 & 31 July 2012 Last major incident -2nd Jan 2001

  12. Installed capacity: 240 GW Energy Requirement : 900 BU /annum Northern 56 GW Two Synchronous Systems: N-E-W Grid & SR Grid North-eastern 2.4 GW 26 GW 67 GW Eastern Western Large shortage 8 % peak 9 % energy 53 GW Southern POSOCO

  13. 36 GW System affected @ 02: 33 hrs 48.68 Hz Large Unscheduled Flows 30-July-2012 Axis of separation System restored within 13: 30 hours System survived Restoration started within few minutes Start up power from Western and Eastern Region, Black start by several hydro stations POSOCO

  14. @ 13:00 hrs 49.84 Hz Large Unscheduled Flows 31-July-2012 48 GW System affected Axis of separation System restored within 2 hours in Northeast 5 hours in North 8 hours in Eastern grid System survived Restoration started within few minutes Start up power from Western and Southern Region, Black start by several hydro stations POSOCO

  15. Underlying causes of the grid incidents • System planned for scheduled flows • Electricity Market and Open Access since 2004 • Large unforseen power flows POSOCO

  16. Measures being taken • Review of Transmission Planning Criteria • Strengthening of Intra-State and inter regional transmission system • Enhancement of network visualization • Synchrophasors • Dynamic Security Assessment • Review of penal provisions of Electricity Act, 2003 POSOCO

  17. Thank you for kind attention ! POSOCO

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