基于备用安全的含风电场的电力系统经济调度

Economic Dispatching in Wind Power Integrated System Based on Reserve Security

随着风电在电网中渗透功率的持续增加,风电的不确定性给系统的备用决策和发电调度带来新的难题。为保障含风电场电力系统的安全运行,本文结合风电预测误差的概率密度函数,提出了一种系统运行安全性指标——备用安全可信度,并以备用安全可信度最大化和火电机组运行费用最小化作为优化目标函数,建立了含风电场的电力系统经济调度模型。针对寻优效率,本文采用了一种将优先顺序法和内点法相结合的优化方法对机组组合问题求解。算例分析证明了所提模型和解法的可行性和合理性。

With the increasing application of wind power in power systems, the uncertainty of wind power brings new challenges in both reserve capacity decision - making and generation dispatching. By considering the operation securi- ty of wind power integrated system, a kind of system opera- tion security index, reserve security reliability, is proposed by combining with the probability density function of fore- casting error for wind power. With the objective function being the maximum reserve security reliability and the mini- mum fuel cost, the economic dispatching model of power grid with wind power is built. In order to improve optimiza- tion efficiency, an optimized method that combines interior -point method with priority method is applied to solve the problem of unit commitment. In the end, test cases verify the feasibility and reasonability of proposed model and solu- tion method.