考虑dq轴耦合及线路分布参数的分布式电站谐波不稳定分析  

Harmonic instability analysis of distributed power stations considering dq-axis coupling and line distribution parameters

作　　者：龚利武 陈超 钱国良 张炜 徐方维[3] 陈锴 郑鸿儒 GONG Liwu;CHEN Chao;QIAN Guoliang;ZHANG Wei;XU Fangwei;CHEN Kai;ZHENG Hongru(State Grid Pinghu Power Supply Company,Pinghu,Zhejiang 314200,China;State Grid Jiaxing Power Supply Company,Jiaxing,Zhejiang 314000,China;College of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]国网浙江省电力有限公司平湖市供电公司,浙江平湖314200 [2]国网浙江省电力有限公司嘉兴供电公司,浙江嘉兴314000 [3]四川大学电气工程学院,成都610065

出　　处：《浙江电力》2024年第5期43-52,共10页Zhejiang Electric Power

基　　金：国网浙江省电力有限公司科技项目(5211JX220005)。

摘　　要：针对同时考虑dq轴耦合和线路分布参数两种因素下,分布式电站系统超越方程零、极点难以求解问题,建立同时考虑二者的电站阻抗模型,提出基于Padé近似的超越方程矩阵行列式零、极点求解方法,并给出系统传递函数矩阵行列式零、极点计算的详细步骤。进一步,分析不同场景下两种因素对系统谐波不稳定分析的影响。研究表明,所提方法可准确分析同时考虑两种因素下的分布式电站谐波不稳定问题,忽略二者中任一因素均可能造成稳定性误判,且考虑线路分布参数是求解高频谐波放大点的必要前提。仿真结果验证了所提方法的有效性。To address the challenge of solving the zero-pole of transcendental equation for distributed power station with simultaneous consideration of two factors,i.e.,dq-axis coupling and line distribution parameter,an impedance model for distributed power station considering the two factors is established.This paper proposes a matrixdeterminant zero-pole solution method for transcendental equation using Padéapproximation and provides detailed steps for calculating the zero-pole distribution of the transfer function.Furthermore,it analyzes the impact of the two factors on harmonic instability analysis in the system under different scenarios.The research demonstrates that the proposed method can accurately analyze harmonic instability issues when these two factors are considered simultaneously.And ignoring one of the two factors may result in the misjudgment of stability,and considering the line distribution parameter is a necessary prerequisite for solving the amplification point of high-frequency harmonics.The effectiveness of the proposed method is verified by simulation.

关 键 词：分布式电站 谐波不稳定 分布参数 dq轴耦合 超越方程 Padé近似 

分 类 号：TM712[电气工程—电力系统及自动化]