AncillaryServices.KirschenChapter5Slides.LTEdits.pdf

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Preventive Actions • Put the system in a state such that it will remain stable whether or not a contingency occurs • Example: Operate the system at less than full available generation and/or line capacity (so operations can be maintained even if a generator or line outage occurs) � Implies some feasible energy trades are not allowed � Opportunity cost of lost energy trades (e.g., decrease in GenCo net earnings) can outweigh gain in system reliability © Daniel Kirschen & Leigh Tesfatsion 2011 6
Corrective Action • Taken only if a disturbance does occur • Limits the consequences of this disturbance • Can require system operator to purchase various types of A/S from market participants • Some A/S entail the delivery of energy whereas other A/S entail the curtailment of energy usage • The important factor for the system operator is ensuring in advance the capacity to deliver/curtail energy as needed to limit consequences of a disturbance. • Value of A/S is its availability to deliver/curtail energy as reliability needs arise, not simply actual energy delivery or curtailment © Daniel Kirschen & Leigh Tesfatsion 2011 7
Page 1 and 2: System Reliability and Ancillary Se
Page 3 and 4: Key Definition: Ancillary Services
Page 5: System Reliability = Adequacy + Sec
Page 9 and 10: Needs for Ancillary Services (Secti
Page 11 and 12: Balancing Generation and Load…Con
Page 13 and 14: Balancing Generation and Load … C
Page 15 and 16: Balancing Generation and Load … C
Page 17 and 18: Balancing Services…Continued Diff
Page 19 and 20: Example: Load (MW) Over 5 Trading P
Page 21 and 22: Actual Power Produced Over the 5 Pe
Page 23 and 24: Sources of Imbalance & correspondin
Page 25 and 26: Regulation Service in More Detail:
Page 27 and 28: Spinning/Non-Spinning Reserve Servi
Page 29 and 30: Network Issues: Contingency Analysi
Page 31 and 32: Example: Thermal Capacity A B Figur
Page 33 and 34: Example: Transient Stability • As
Page 35 and 36: Example: Voltage Stability … Cont
Page 37 and 38: Voltage Control & Reactive Support
Page 39 and 40: Example: Voltage Control under Norm
Page 41 and 42: Example: Reactive support After Lin
Page 43 and 44: Other Forms of Ancillary Services
Page 45 and 46: Obtaining Ancillary Services (A/S)
Page 47 and 48: How much A/S should be procured …
Page 49 and 50: One Possibility: Compulsory A/S Pro
Page 51 and 52: Disadvantages of Compulsory Provisi
Page 53 and 54: Another Possibility: Have an A/S Ma
Page 55 and 56: Disadvantages of an A/S Market •
Page 57 and 58:
Advantages of Demand-Side Provision
Page 59 and 60:
Who Should Pay for A/S? • Differe
Page 61 and 62:
Example: Allocating Cost of Reserve
Page 63 and 64:
Selling A/S • Selling A/S is a bu
Page 65 and 66:
Notation: 1 2 x 1 x 2 P min P max R
Page 67 and 68:
First-Order Necessary Conditions fo
Page 69 and 70:
Case 1: • No binding constraints
Page 71 and 72:
Case 3: • Unit operates at minimu
Page 73 and 74:
Case 6: • Reserves limited by ram
Page 75:
Case 8: • Generator at minimum ou
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