适应于逆变型风电接入系统的改进故障序分量选相方法  

An improved fault sequence component phase selection method adapted to an inverter-interfaced wind farm access system

作　　者：郎学毅 汤亚芳[1] 熊炜[1] 周吉 郭元萍 LANG Xueyi;TANG Yafang;XIONG Wei;ZHOU Ji;GUO Yuanping(College of Electrical Engineering,Guizhou University,Guiyang 550025,China;Power Grid Planning and Research Center of Guizhou Power Grid Co.,Ltd.,Guiyang 550025,China)

机构地区：[1]贵州大学电气工程学院,贵州贵阳550025 [2]贵州电网有限责任公司电网规划研究中心,贵州贵阳550025

出　　处：《电力系统保护与控制》2024年第7期89-97,共9页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52367005)。

摘　　要：针对传统故障序分量选相元件在逆变型风电接入系统中可靠性较低的问题,提出了一种改进的故障序分量选相方法。首先,分析在最新风电场低电压穿越策略下,风电侧的故障序阻抗特性及传统故障序分量选相元件的适应性。然后,利用负正序、负零序阻抗相位差等效正负序、零负序电流分支系数相位差,以补偿传统序分量选相判据的相角误差。最后,采用补偿后的故障序电流相位差作为选相判据,实现了故障相的判别。同时通过调整零负序选相分区,使其具有较好的耐过渡电阻能力。仿真实验表明,在不同故障类型、故障位置和过渡电阻下改进选相方法均能可靠地选出故障相。To address the low reliability of traditional fault sequence component phase selection in an inverter-interfaced wind power access system,an improved fault sequence component phase selection method is proposed.First,the fault sequence impedance characteristics of the wind power side and the adaptability of the traditional fault sequence component phase selection element are analyzed in the latest low voltage-through strategy of a wind farm.Then negative positive sequence and negative zero impedance phase difference are used to the equivalent positive and negative sequence current branch coefficient phase difference so that the phase angle error of the traditional sequence compensating phase selection criterion can be compensated.Finally,the compensated fault sequence current phase difference is used as the phase selection criterion,and the fault phase identification is realized.The method has better resistance to transition resistance by adjusting the zero negative sequence phase selection partition.The simulation results show that the improved method can reliably select the fault phase with various fault types,different fault locations and transition resistance.

关 键 词：逆变型风电 故障序分量 故障选相 序阻抗 

分 类 号：TM614[电气工程—电力系统及自动化]