含大型风电场的电力系统多时段动态优化潮流

Multi-Period Dynamic Optimal Power Flow in Wind Power Integrated System

大型风电场的并网对电力系统的优化运行提出了新的挑战。该文对含风电场的电力系统优化潮流问题进行了研究,建立了多时段动态优化潮流模型,为了考虑风速随机变化的特点,提出了分时段策略,将风机在每个时段输出功率的期望值用于优化潮流的计算。文中对现有含风电场的潮流计算方法进行了分析,推导了异步风力发电机的无功-电压特性方程,在此基础上提出了含风电场的潮流计算新方法,并将其应用于提出的动态优化潮流模型中。算例表明该方法是有效的,具有一定的实用性。

Large wind farms connected to power grid bring new challenges to optimal operation of power systems. In this paper, the optimal power flow （OPF） problems in wind power integrated systems are researched. A multi-period dynamic OPF model is presented. In order to consider the wind speed random behavior, this paper proposes a dividing-stage strategy. The expectation of the wind power production every stage is used for power flow calculations. This paper analyzes the shortages of actual methods for power flow calculations of wind power integrated systems. Based on the Q-V equation of the induction generator, a new power flow computation method for the multi-period dynamic OPF is presented. The effectiveness and computation performance of the proposed method are verified in the IEEE 30-bus system with some modifications.