计及智能电表非同步特性的配电系统状态估计

State Estimation of Distribution System Based on the Asynchrony Characteristic of Smart Meter

配电系统状态估计(distribution system state estimation,DSSE)是配电系统监测控制中的重要组成部分。智能电表在配电网络中提供相当精确的测量值,使较高质量的DSSE成为可能,但由于智能电表的数据具有非同步特性,直接用于传统的DSSE算法会导致状态估计精度不高。针对DSSE中智能电表的测量异步问题,提出一种改进DSSE方法,该方法通过历史数据适当调整智能电表测量数据,在不同程度上消除误差因素。仿真结果表明,改进方法提高了DSSE的精度,且能较好处理负荷突变的情况。

Distribution system state estimation（DSSE） is an important part of distribution system monitoring and control.Smart meter provides fairly accurate measured values in distribution network,which makes the higher quality DSSE to be possible.But because the data of smart meter has asynchronous characteristic,its direct usage in traditional DSSE algorithm will lead to the low state estimation accuracy.Aimed at the asynchronous measuring problems of smart meter in DSSE,a modified DSSE method is proposed.The method adjusts properly measuring data of smart meter by using history data so as to eliminate error factors in different degrees.Simulation results show that the modified method improves the accuracy of DSSE and can handle well the sudden change of load.