Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Anciliary Services and Indian Power System


Published on

Published in: Business, Technology
  • Be the first to comment

  • Be the first to like this

Anciliary Services and Indian Power System

  1. 1. Date: 11-04-2013Ancillary Services andIndian Power SystemIPPAI conference on 10th& 11thApril 2013…..
  2. 2. Confidential Slide 2TransmissionDistributionGeneration All in one Utility Generation, Transmission andDistribution toward objective ofpower supply Cost (merit order), reliability,security and quality, allresponsibility of the utility andwill be as per its efficiency
  3. 3. Confidential Slide 3TransmissionDistributionGenerationSystemOperationSupply Unbundled system Generation, Transmissionand Distribution System operation andsupply functions becomevisible as distinct activity Service are transacted
  4. 4. Confidential SlideServices are transacted….. What ? Basic services Ancillary services How ? Price Market Regulations4 Unbundled system - Reliability,Security, Quality and ultimatefinal cost to consumer getdetermined from : Rules and regulations of thegame Market efficiency Behavior and efficiency of allplayers not for reliability,security, quality and cost ofsupply but towards their ownbusiness objective
  5. 5. Confidential SlideBasic and Ancillary Services Basic Services: Generation, Transmission and Distribution towardobjective of power supply as per basic servicerequirement Ancillary Services: Value added services towards supporting andimproving reliability, security and quality5
  6. 6. Confidential SlideAncillary Services Real Power Balancing Operating Reserves Scheduling and dispatch Inter-area power flow control Reactive Power - Voltage Control Economic dispatch Transmission Security System Protection Black Start6 Real Power Balancing Reactive Power Voltage Control Scheduling and Dispatch Inter-area power flow control System Protection Energy Imbalance Frequency Control Black Start Reserve Transmission Security Economic dispatch Financial Trade Enforcement Losses …. ….Indian ContextLiterature :FERC / CIGRE / Other AuthorsRefer POSOCO June 2010 paper
  7. 7. Confidential SlideBasic and Ancillary Services which we already have7Ancillary Services :Compulsory Provision• Transmission Security• Scheduling and dispatch• System Protection – SPS• Primary Frequency Response – FGMOclause 5.2 (f) of IEGC – has so farremained un-achievableVoluntary – Priced• Real Power Balancing through loosefrequency control and UI pricing• Reactive power support for voltagecontrol• Inter-area power flow - Congestionmanagement only for schedulingVoluntary cooperation – Un-priced• Black StartBasic Services:• Generation•Transmission•Distribution – Supplyutility•System Operation•Power Market•Operational coordination•Maintenance coordination•System Protection - basic•Planning coordination•Regulatory MechanismIndian Power System
  8. 8. Confidential SlideScheduling, Market and Real Power Balancing1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 243634323028262422Bilateral (Base load) contractBilateral (peak load) contractDay Ahead Hour AheadSellBuyBuySellForecasteddemandAncillaryServiceIntra DaydemandReal-timedemandBuy and Sell includes Scheduling and Re-scheduling from capacity contracts
  9. 9. Confidential SlideReal Power BalancingIntent of adherence to schedules for each time block is apre-requisiteAnd then the Real Power Balancing ancillaries to improve thatbasic level of adherence viz. FGMO – primary control by thermal units Secondary Control from reserve Hydro/Gas Units Tertiary Control by stand-by reserve unitsAll the above including FGMO could be procured as a pricedservice9
  10. 10. Confidential SlideFrequency linked UI tariffvsAncillary Power Market Can the two co-exist ? Yes Should they co-exist ? Real power getting balanced through ancillary power, there may notremain justification for frequency linked UI pricing Frequency linked UI pricing may inhibit ancillary market Can we phase out frequency linked UI in steps ?10
  11. 11. Confidential SlideReal Power Balancing Required for real power balancing, not frequency control Frequency variation is just an indicator of balancing error Also required for inter-area power flow control Inter-area power flow control more critical for system security Balancing has to come from un dispatched generation as well asload management In moving towards scheduled operation regime, balancing powerfrom generators and that from load management both must de-linkfrom frequency and priced as per time block market discoveredvalues– POSOCO proposal is only one sided11
  12. 12. Confidential SlidePOSOCO proposal Establishing Ancillary power Market is a much felt necessityBut POSOCO proposal may need some basic change Frequency triggered procurement ?? Risks: Procuring unwanted power Frequency shoot-ups Forcing utilities to pay for what they could not afford to buy May cause undesired and forced increase in UI12
  13. 13. Confidential SlideFGMO – why have we failed ? FGMO – primary control by thermal units Secondary Control from reserve Hydro/Gas Units Tertiary Control by stand-by reserve unitsUnlike the normal sequence of primary to secondary to tertiary,requirement of placing control mechanism in power system has to be theother way round.For a successful primary control, we must have secondary controlmechanism already in place and for successful secondary control we musthave tertiary control mechanism already in place13
  14. 14. Confidential SlideFGMO – why have we failed ? Primary Control – FGMO ofthermal units Secondary Control fromreserve Hydro/Gas Units Tertiary Control by stand-byreserve units14PLACINGMECHAMISMOPERATIONUCTE’s classification of frequency reservesTaken from POSOCO Approach Paper of June 2010
  15. 15. Confidential SlideProcurement of Ancillary Services Compulsory Provision through Rules and Regulations Voluntary Participation through Pricing and Market mechanism through Voluntary cooperation – un-priced15
  16. 16. Confidential SlideTransmission Security Inter-area power flow control Re-scheduling and based on system evaluated securitystatus Dynamic protection based on real time feeder loads, areaexchange deviations and frequency instead of presentschemes of only frequency based fixed feeder U/F anddf/dt load shedding16
  17. 17. Thank youDate: 11-04-2013