不对称电网故障下直驱型永磁风力发电系统网侧变流器的运行与控制  

Operation and Control on the Grid-Side Converter of the Directly-Driven Wind Turbine With PM Synchronous Generator During Asymmetrical Faults

作　　者：黄守道[1] 肖磊[1] 黄科元[1] 陈自强[1] 熊山[1] 

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》2011年第2期173-180,共8页Transactions of China Electrotechnical Society

基　　金：教育部高等学校博士学科点专项科研基金(200805321038);国家自然科学基金青年科学基金(50907020);湖南省自然科学重点研究项目(10JJ8003)资助

摘　　要：分析了三相不平衡电网电压下直驱永磁同步风力发电机组直流母线电压波动的机理,研究了消除不平衡功率传输引起的二次纹波控制策略,以提高变流器在电网不对称故障下的故障穿越能力。通过将比例积分谐振控制器引入直驱型永磁风电机组网侧变流器控制,在正序同步旋转坐标系下同时对正负序电流进行稳态无差调节,来抑制负序电流失控所引起的直流母线电压二次波动,维护风电机组的稳定运行。仿真与实验结果表明本文所提控制算法能够有效地在正序同步旋转坐标系下控制正负序电流,抑制直流母线电压波动。Fluctuation mechanism on DC voltage of converter and stability control strategy in order to improve the capability of faults ride through were studied when asymmetry faults took place.By the introduction of proportional-integral-resonant controller to grid-side converter,and steady-state non-poor regulation for positive and negative sequence current in the positive-sequence synchronous rotating frame,a new control algorithm was proposed to eliminate the quadratic fluctuations of DC voltage caused by the negative-sequence current out of control,and maintain the wind turbine stable.Simulation and experimental results show that the proposed control algorithm can effectively control positive and negative-sequence currents in the positive-sequence synchronous rotating frame,and eliminate the DC voltage fluctuation.

关 键 词：风力发电 直驱式 不对称故障 故障穿越 谐振控制器 

分 类 号：TM614[电气工程—电力系统及自动化] TM713