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Research on thermal-hydro-wind joint scheduling considering N-1 security constraints

Day-ahead optimal scheduling is a crucial problem for power system operation. With the fast development of modern power system, power diversification and increasingly high demand of security are calling for new considerations in the research of this area. It is necessary to schedule multi power supplies jointly and optimally under possible contingencies, thus to ensure the safety and economic operation of power grid. This paper specifically aims at the problem of day-ahead generation scheduling considering multi-type power generation and power system security requirement. An optimal scheduling model is proposed for thermal-hydro-wind joint operation considering system security constraints. In this model, refined characteristics of different generations and system operation constraints are well modeled. Specifically, in thermal power modeling, the nonlinearity of operation cost start-up/shut-down cost function is considered. In hydro power modeling, hydro power stations of different water-holding capacity and adjustment ability are formulated separately. In system-level, a novel formulation for available reserve capacity and N-1 security criteria is proposed, to obtain a more practical and security scheduling plan. The integrated model is established as a mixed-integer linear programming optimization problem, so that it can be easily solved by multiple mature and effective algorithms.