电压稳定研究中的戴维南等值参数求解方法分析

Analysis on Solution Method for Thevenin Equivalent Parameters in Research on Voltage Stability

基于戴维南等值的电压稳定分析是电压稳定研究领域的一种重要方法,其中戴维南参数的求解方法对电压稳定分析结果有较大的影响。通过分析国内外求解戴维南参数的研究现状,将其求解方法分为基于全网信息和基于本地量测两大类。讨论了各方法的准确性、快速性和适用性等特性,分析认为基于偏差校正的方法求解戴维南参数的精度高、速度快、适用范围广,有较好的发展前景。进一步对此类方法中基于向量空间分析的偏差校正方法与可自适应调整遗忘因子的递归最小二乘法进行了算例分析和对比,结果表明,前者有更强的准确性和有效性,适用于电压稳定的实时、在线分析。同时对求解戴维南参数时测量噪声处理、相量同步、滑动数据窗大小选择等关键问题进行了讨论,总结了各问题的解决方案。

Voltage stability analysis based on Thevenin equivalent is a kind of important method for voltage stability research and the solution method for Thevenin equivalent parameter may have larger impact on voltage stability analysis result. By an- alyzing research status quo of solution to Thevenin parameter at home and abroad, this paper divides the solution methods into two types respectively based on the whole network information and local measuring. It discusses characteristics of various methods such as veracity, rapidity and feasibility and it considers that the method based on offset correction for solving Thevenin parameter is of high precision, rapid speed and wide range of application which is preferable for development. It analyzes and compares examples of offset correction method based on vector space analysis and recursive least squares based on self-adaptive adjustment of forgetting factor. The results show that the former method is provided with stronger correc- tion and effectiveness which is suitable for real-time and online analysis on voltage stability. Meanwhile, it discusses key problems such as measuring noise, phasor synchronization and selection for size of sliding data window in solving Thevenin parameter and summarizes solution schemes for various problems.