不确定因素对含分布式电源的配电系统可靠性影响分析

Analysis of Impact of Uncertain Factors on Reliability of Distribution System With Distributed Generation

随着分布式电源(distributed generation,DG)接入配电系统,配电系统从一个辐射式的网络变为一个遍布电源与用户互联的网络,从而使可靠性分析的模型和方法发生了变化。针对分布式电源输出功率的不确定性,建立分布式电源的多状态可靠性模型;同时考虑实际运行过程中不可避免的元件气候环境的变化和可修复资源随时间变化的因素,结合孤岛运行方式,对传统的最小割集法进行改进,使之适用于含分布式电源的配电系统可靠性分析计算;并针对IEEE-RBTS的母线6配电系统入手实施可靠性分析,表明气候因素、可修复资源及分布式电源的位置和容量对可靠性指标具有不同程度的影响;指出在实际运行过程中,应在考虑各种因素基础上,合理利用分布式电源以提高配电系统的供电可靠性。

As the distributed generation(DG) is integrated into distribution system, distribution system is converted from a radiation-type to an inter-connected, thus reliability analysis model and its computing method changes. Against the uncertainty of distributed generation output, a multi-status reliability mode for distributed generation was built. Meanwhile, the inevitable environment factor and the time-varying factors of repairable resources were taken into account. Combining the island operation mode, the traditional minimal cut method was improved, making it adaptable to the reliability calculating of distribution system. By analyzing the reliability for the IEEE-RBTS distribution system bus 6, it shows that environment factors, repairable resources and distributed power positions and its capability will bring different influence to reliability index. The research also points out that the practical operation should lay out the distribution power reasonably to improve the reliability of distribution system based on taking all these factors into consideration.