基于同步相量测量的配电网状态估计方法

Synchronous Phasor Measurements Based Distribution Network State Estimation Method

为保证现代电力系统配电网的安全稳定运行和供电能力,需要快速获取配电网准确的实时状态进而对系统进行动态分析、评估和控制。本文构建了复数域下基于同步相量测量的配电网线性状态估计模型,考虑节点注入约束提升了测量的冗余性,分析同步相量测量的误差特点并提出复数域最小二乘法求解状态估计问题。面向实际应用需求,通过分析测量残差提出一种权重自适应调整算法,以及一种不良数据辨识和校正的方法。仿真结果表明,所提方法能有效提高配电网状态估计的准确性、实时性和适用性。

To ensure the safe and stable operation and power supply capacity of distribution network in a modern power system,it is necessary to quickly obtain the accurate real-time state of distribution network to dynamically analyze,evaluate and control the system.In this paper,a linear state estimation model of distribution network based on synchro⁃nous phasor measurements in complex field is constructed,and the node injection constraint is considered to improve the measurement redundancy.The error characteristics of synchronous phasor measurements are analyzed,and the com⁃plex field least squares method is proposed to solve the state estimation problem.Aimed at the practical application de⁃mand,a weight adaptive adjustment algorithm is put forward through the analysis of measurement residual.Meanwhile,a method for identifying and correcting bad data is also proposed.Simulation results show that the proposed method can effectively improve the accuracy,real-time performance and applicability of distribution network state estimation.