多区域电力系统日前发输电计划方法——以中国南方电网为例

Abstract: The challenges of multi-area power system optimal dispatch exist on how to be in line with certain dispatching mode as well as on the modeling/solution. In this article, a multi-area system day-ahead scheduling, with a provincial systems-reducing method and a generation variances-minimizing objective, is proposed, based on the hierarchical dispatching organization and the long-term bilateral energy contract mode in China. Non-iteratively, the sub-optimal scheduling of ac/dc tie-lines and independent generation units can be derived from solving the model, which also considers some practical constraints like discrete constraints of dc power profiles and power flow limits of local ac interface, etc. Case study is carried out based on the realistic data from the multi-area hybrid ac/dc southern China power system, to verify the effectiveness and feasibility of the proposed model. It is demonstrated that with this method, the upper-level dispatching institution can generate an optimized and reliable transmission power plan with limited information, which decreases the peak-valley difference and standard variance of generation series, relieves the burden of peak regulation of its sub-systems, and hence improves the economic efficiency. The approach suits the dispatching mode of power systems in China well, handles various operation scenarios, and thus has been implemented in the system operator.