永磁直驱风电场故障等值建模方法  

Equivalent Modeling Method for Faults in Permanent Magnet Direct-Driven Wind Farm

作　　者：张武洋 杨飞 孔繁哲 刘梦夏 田景辅 贾科 毕天姝 ZHANG Wuyang;YANG Fei;KONG Fanzhe;LIU Mengxia;TIAN Jingfu;JIA Ke;BI Tianshu(Electric Power Research Institute of State Grid Liaoning Electric Power Co.,Ltd.,Shenyang 110006,China;State Grid Liaoning Electric Power Co.,Ltd.,Shenyang 110006,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]国网辽宁省电力有限公司电力科学研究院,沈阳110006 [2]国网辽宁省电力有限公司,沈阳110006 [3]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《南方电网技术》2023年第8期23-30,47,共9页Southern Power System Technology

基　　金：国家电网公司总部科技项目“适应大规模新能源接入的继电保护运行关键技术研究”(SGLNDK00JBJS2200069)。

摘　　要：新能源场站故障建模与分析方法是风电、光伏集中并网地区的故障特性和保护研究的基础,然而目前广泛采用的单机等值模型无法准确反映场站短路电流特征。基于永磁风机的故障特征对等值前后的dq轴电流进行归算,得到了等值产生的短路电流误差与机组电气量边界的解析关系,并根据所需等值精度给出了建立多机等值模型的分群边界,实现永磁风电场的多机建模。以典型实际场站拓扑为例搭建了仿真模型,仿真结果表明该模型与详细模型的故障电流特征基本一致,其精度与单机等值模型相比有较大提升,验证了所提出的分群判据的合理性。The fault modeling and analysis method of renewable energy stations is the basis of fault characteristics and protection research in wind power and photovoltaic centralized grid connected areas.However,the widely used single machine equivalent model cannot accurately reflect the short-circuit current characteristics of the stations.Based on the fault characteristics of the permanent magnet wind turbine,the dq axis currents before and after the equivalence are reduced,and the analytical relationship between the short-circuit current error caused by the equivalence and the electrical quantity boundary of the unit is obtained.Accord⁃ing to the required equivalence accuracy,the cluster boundary for establishing the multi-machine equivalent model is given to realize the multi machine modeling of the permanent magnet wind farm.A simulation model is built with a typical actual station topology as an example.The simulation results show that the fault current characteristics of the proposed model and the detailed model are basi⁃cally the same,and its accuracy is greatly improved compared with the single machine equivalent model,which verifies the rationality of the clustering criterion proposed in this paper.

关 键 词：永磁直驱 风电场 等值建模 短路电流 聚合边界 

分 类 号：TM614[电气工程—电力系统及自动化]