永磁直驱系统变流器开路故障诊断方法  

Converters Open-Circuit Fault-Diagnosis Methods Research for Direct-Driven Permanent Magnet Wind Power System

作　　者：黄科元[1] 刘静佳[1] 黄守道[1] 易韵岚 周李泽 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《电工技术学报》2015年第16期129-136,共8页Transactions of China Electrotechnical Society

基　　金：湖南省自然科学基金(11JJ3062);国家国际科技合作项目(2011DFA62240);湖南大学青年教师成长计划资助项目

摘　　要：永磁直驱系统变流器的开路故障会严重影响系统的运行特性。为了提高系统可靠性,要求系统能够及时检测到故障的发生并准确判断出故障器件的所在位置。本文根据故障时电流的变化特性,提出了变流器单个器件开路故障的诊断方法。该方法通过电流Park矢量相位角的变化检测故障的发生,并依据故障后机侧平均电流的Park矢量相位角所在区间和网侧各相电流的正负确定故障器件的所在位置。仿真和实验结果证明所提方法准确、可靠,且对负载突变、电网电压跌落等干扰具有鲁棒性。The open-circuit faults of the converters in wind energy conversion system will seriously affect the operation of the system. In order to improve the reliability of the system, it is necessary that demands the system can timely detect faults and accurately diagnose the faults＇ position. This paper presents a diagnostic method for an open-circuit fault in the two power converters according to the variations of fautly current. This method detects faults based on the variations of current Park＇s vector phase, locates fault＇s position according to the range of motor-side average current Park＇s vector phase and the positive or negative of grid-side each phase current. Simulation and experimental results verify the validity of the proposed method, besides this method has the robustness against disturbance such as load transients, grid voltage sags.

关 键 词：永磁直驱 风力发电 变流器故障 故障诊断 

分 类 号：TM461[电气工程—电器] TM464