Dynamic Line Rating in Real Time Markets

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NYISO Normal Operating State Criteria • Pre-Contingency (Actual) Flow Criteria: • Actual loading of equipment defined as part of the NYS Transmission System should not exceed the associated Normal ratings of the equipment • Post-Contingency Flow Criteria: • Preventitive mode: • the loss of any single generator, single circuit, or adjacent circuits on the same structure, together with other facilities, which will trip at the same time due to pre-set automatic devices, will not cause any portion of the NYS Transmission System to exceed its LTE rating. • Corrective mode: • Underground cable : may exceed its LTE rating, but not its STE rating, provided 10- minute reserve or PAR control is available to return its post-contingency loading to its LTE rating within 15 minutes, without causing another facility exceed its LTE rating • Overhead Transmission: with prior approval of the NYISO, the post-contingency loading of any portion of the NYS Transmission System may exceed its LTE rating, provided sufficient control is available to return the loading on the facility to its LTE rating within 15 minutes, without causing another facility to exceed its LTE rating 10
NSA Mathematical Model All network constraints passed to NCUC are expressed in terms of generator shift factors and constraint limits. The constraint limits are distinct from the original transmission constraint ratings. They represent the aggregate effect of the shift factors and violations on the constraints. • If P pre , ij represents the precontingency flow in branch, and this branch flow is the violated security constraint then: max P (1) pre , ij Ppre , ij max • Where P pre,ij is the pre-contingency rating (Normal rating). The constraint to be enforced is of the following form max P ij Ppre, ij Ppre, ij (2) 11
Page 1 and 2: NYISO: Dynamic Line Rating in Real
Page 3 and 4: NYISO Transmission Legend: 765 kV 5
Page 5 and 6: Real-Time Markets
Page 7 and 8: Real-Time Market Input • RT Offer
Page 9: Network Security Analysis
Page 13 and 14: Potential Research Areas: Post- Con
Page 15 and 16: Post-Contingency Constraint Limit C
Page 17: The New York Independent System Ope

Dynamic Line Rating in Real Time Markets

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