风电接入电力系统故障电流的影响因素分析及对继电保护的影响  

Affecting factors of grid-connected wind power on fault current and impact on protection relay

作　　者：张保会[1] 李光辉[1] 王进[1] 郝治国[1] 刘志远[2] 薄志谦[3] 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049 [2]宁夏电力公司调度中心,宁夏银川750001 [3]ALSTOM输配电有限公司．英国斯塔福德ST174LX

出　　处：《电力自动化设备》2012年第2期1-8,共8页Electric Power Automation Equipment

基　　金：国家973计划资助项目(2009CB219704)~~

摘　　要：在EMTDC/PSCAD平台上建立了鼠笼式、双馈式及直驱式3种常见风电机组的电磁暂态模型。比较直驱式风机电磁暂态数值模型与数模混合实验在各种故障条件及控制策略下的仿真结果,验证了模型的正确性。同时比较双馈式风机电磁暂态模型的故障仿真结果与双馈式风场短路实验结果,验证了所提双馈式风机电磁暂态模型的正确性。在以上模型的基础上,仿真了风电机组在各类故障条件下的电磁暂态特征,结果表明风机类型、风机的工作状态、风机所采用的控制方法、故障类型以及风电场的弱电源特性是影响并网运行风电故障电流的主要因素,研究结果为现有继电保护的改进与研发新原理继电保护打下了基础。The electromagnetic transient models are developed with PSCAD/ EMTDC for three kinds of wind turbine：squirrel-cage wind turbine,DFIG wind turbine and D-PMSG wind turbine.The validity of the electromagnetic transient model for D-PMSG wind turbine is verified by comparing its simulative results with the results of digital-analog hybrid experiments under different fault conditions and control strategies.The validity of the electromagnetic transient model for DFIG wind turbine is verified by comparing its simulative results with the results of short-circuits experiment for real wind farm.Based on these models,the electromagnetic transient characteristics of wind turbines under different fault conditions are analyzed,which show that,the type,working status and adopted control strategy of fan,the fault type and the characteristics of weak power source are the main factors affecting on the fault current of grid-connected wind farm.The research lays the foundation for improving existing protection relay and developing new protection principles.

关 键 词：风机 电力系统 电磁暂态模型 正确性验证 暂态分析 仿真 

分 类 号：TM77[电气工程—电力系统及自动化] TM614