永磁直驱风电系统低压穿越能力及直流链电压稳定性研究  

LVRT Capacity and DC Link Voltage Stability of Permanent Magnet Directly-driven Wind Turbine

作　　者：刘亚磊[1] 李兴源[1] 王渝红[1] 魏巍 

机构地区：[1]四川大学电气信息学院,成都610065 [2]四川省电力科学研究院,成都610072

出　　处：《华东电力》2013年第2期333-336,共4页East China Electric Power

基　　金：国家自然科学基金重点项目(51037003);国家863高技术基金项目(2011AA05A119)~~

摘　　要：提出了一种既提高风机低压穿越能力又维持直流链电压稳定的方法。包括网侧变流器根据电网电压的变化量决定输出无功电流的大小,且在直流侧增加由多个电阻并联而成的卸荷电阻来提高低压穿越能力;在直流电压控制环附加电流补偿因子用于维持直流链电压稳定。仿真结果表明采用提出的控制策略的永磁直驱风机低压穿越能力较强,且能较好地维持直流链电压稳定。This paper proposes a method not only to improves the wind turbine low-vohage ride through （LVRT） ca- pacity, but also to maintain the DC link voltage stability. The grid-side converter outputs the reactive power according to the grid voltage variation; the LVRT capacity is improved by adding unloading resistance, composed of multiple parallel resistances, to the DC side ; Additional current compensation factor in the DC voltage control loop is used to maintain the DC link voltage stability. Simulation results show that using the proposed control strategy the permanent magnet directly-driven wind turbine has better LVRT capacity, can maintain higher DC link voltage stability.

关 键 词：低压穿越能力 直流链电压稳定 卸荷电阻 电流补偿因子 

分 类 号：TM614[电气工程—电力系统及自动化]