考虑风光接入的柔性互联配电网概率潮流算法研究

Research on probabilistic power flow algorithm of flexible interconnected distribution network with wind and solar access

随着电力电子器件的快速发展,基于电压源换流器的柔性互联配电网已成为当前的研究热点,但对于不确定性分布式电源接入的柔性互联配电网概率潮流算法,却研究较少。在分析了几种常规概率潮流计算方法后,首先以三点估计法和改进三点估计法,结合改进交替迭代算法作为柔性互联配电网概率潮流算法;然后以Nataf变换结合Cholesky分解进行不确定变量的相关性处理;最后以IEEE 33节点配电系统,结合简化处理的国内首个中压五端柔性直流配电示范工程作为算例,验证了所提算法的有效性。

With the rapid development of power electronic devices,the flexible interconnected AC and DC distribution network based on the voltage source converter (VSC) has become a current research hot spot.However,there are few literature descriptions about the probabilistic power flow of the flexible interconnected distribution network with uncertain distributed power access.After analyzing several conventional probabilistic power flow calculation methods,the three-point estimation method and the improved three-point estimation method are combined with improved AC-DC alternating iterative algorithm are used as a probabilistic power flow realization algorithm for flexible interconnected distribution network.Nataf transformation method combined with Cholesky decomposition are used to deal with the correlation of uncertain variables.Finally,the IEEE33-node power distribution system combined with the first domestic medium voltage five-terminal DC distribution demonstration project are taken as a calculation example,which verified the effectiveness of the proposed algorithm.