含风电机组的配电网电容器投切

Capacitor Switching of Distribution Network with Wind Turbines

针对含出力不确定的风电机组配电网电容器投切问题,提出基于多场景技术的电容器投切方法。将网络划分为多棵局部树,在回推潮流计算后增加局部树的电容器投切,优化模型为凸二次整数规划,采用分支定界法快速求解。根据风机功率只有变化到一定程度时,电容器投切组数才改变的特点,给出快速获得Monte-Carlo模拟的每个场景优化方案算法,不必一一优化每个场景。这样,每个方案包含多个场景,取场景乘以其发生概率后求和所得值最大的方案为投切方案。算例结果验证了算法的有效性。

For capacitor switching in distribution network with uncertain output of wind turbines, this paper proposes a capacitor switching method based on multi-scenario technique. The network is divided into many local trees. The capacitor switching is performed for local trees after the process of backward/forward sweep algorithm. The capacitor switching mathematical model of local tree is twice integer .The capacitor switching need not to be performed when the power of wind turbine changes less. Based on the above conclusion the optimal solution for each scenario obtained by Monte-Carlo simulation can be fast determined. Thus it needs not to calculate each scenario. Thus each solution has many scenarios. The solution is the max value that is the sum of probability for each scenery. The calculation results verify the feasibility of the proposed algorithm.