Unified solution of security-constrained unit commitment (SCUC) problem using a linear programming methodology.

摘要

With the advent of open markets trading power as a commodity, secure operation is an enduring concern of the Independent System Operator (ISO) as it searches for a highly effective Security-Constrained Unit Commitment (SCUC) program. An effective SCUC program is required to coordinate a secure and economic generation pattern for the day-ahead market. Conversely, an ineffective coordination of electric power transfer over the transmission lines could result in congestion, and inadvertently cause outages through line overloading. The literatures have traditionally used the DC model, with only one documented use in which a DC AC model was presented, to solve the SCUC problem. Also, the secure and economic scheduling of units offer primary frequency regulation reserve deployed in a manner after the loss of a transmission line/generator unit; this contingency has not been explored in the development of the SCUC algorithm.;Currently, research has developed a novel Unified SCUC (U-SCUC), for both DC and AC Line-Flow Based (LFB) models, algorithms that will preserve the load flow solution accuracy, and is developed as a general program SCUC that can be easily customized by ISOs. The algorithms created for the generation schedule, based on the Unit Commitment (UC), determination are cast in a linear programming format for achieving the 'best' generation schedule by fixing each line limit. Also, the novel idea of coupling the Security-Constrained Economic Dispatch (SCED) optimization procedure, solving the Economic Dispatch (ED) and the network constraint together, is easily adapted by the LFB model for determining the generation schedule that will result in a minimum daily production cost.;Finally, the primary reserve will be used as one of the security constraints criteria. The deployment of the primary reserves will be accomplished using SCED technique to ensure a secure network in an economic manner. The innovative U-SCUC models were tested using a six-bus three generator and a modified IEEE 30-bus nine generator systems, and the results were analyzed to illustrate the effectiveness of the proposed approach.