考虑分布式发电供电概率的配电网重构

Network Reconfiguration of Distribution System Considering Power Supply Probabilities of Distributed Generations

根据分布式电源中光伏发电和风力发电的出力情况,划分几种不同供电状态,通过风速和光照强度的概率密度函数,计算它们的供电概率。将2类分布式电源的状态进行组合,得出混合状态,考虑混合状态下的发生概率进行配电网重构,重构目标函数是网损乘以状态发生概率。编码方法采用环路编码方式,通过设定规则避开"孤岛"和"回路"的产生。算法采用纵横交叉算法,它由横向交叉算子、纵向交叉算子和竞争算子组成,搜索过程是2种交叉方式与竞争算子结合的方式进行寻优。仿真部分由IEEE33和美国PG&E69节点配电系统组成,同时考虑光伏发电和风力发电的混合状态及其概率,仿真结果表明配电网系统接入分布式电源以后可以进一步减少网损和提升电压质量。

According to the output of wind and photovoltaic power generations,several power supply states are determined,and the corresponding power supply probability of each state is calculated through the probability density functions of wind speed and illumination intensity respectively.In this paper,the distributed network reconfiguration problem is solved by a novel crisscross optimization algorithm（CSO）which consists of hori zon tal crossover and vertical crossover,in the mixed states which are achieved by combining different states of distributed generations（DGs）.In the CSO,the multiplication of loss and pow er supply probability is considered as the objective function and the proposed loop encoding strategy is used to avoid＂island＂and ＂loops＂.In the simulation,IEEE33 and PGE69 are adopted as the benchmark test systems with the mixed states of wind and photovoltaic power generations considered at the same time.The results show that the network loss can be reduced and the voltage quality can also be improved when the distribution network is integrated with DGs.