基于三电平中点钳位式拓扑的中压风电变流器  

Medium-Voltage Wind Power Converter Based on Three-Level Neutral Point Clamped Topology

作　　者：高宁[1] 蔡旭[1] 张亮[1] 罗悦华[1] 

机构地区：[1]上海交通大学电气工程系,上海200240

出　　处：《电机与控制应用》2010年第12期56-62,共7页Electric machines & control application

摘　　要：基于三电平中点钳位式拓扑的中压风电变流器由网侧变换器和机侧变换器组成,两侧变换器接成背靠背的形式。其中网侧变换器采用电网电压定向的矢量控制,实现有功功率和无功功率的解耦控制。机侧变换器采用磁链开环的矢量控制,实现最大风能跟踪。针对三电平中点钳位式变流器中点电位易波动的固有缺陷,采用了一种基于调整冗余小矢量作用时间的空间矢量调制算法对中点电位进行有效控制。仿真结果验证了控制算法的正确性,在理论上论证了将中高压变频技术应用于全功率风电变流器的可行性。The system was composed of two back-to-back three-level neutral point diode clamped convertor（NPC）.The control strategy of the grid NPC was grid voltage orientation vector control,which can efficiently control the active and reactive power by controlling daxis current and q-axis current.Rotor flux orietation control was utilized in the generator side NPC,which can accurately track maximum wind power corresponding to different wind speed.This issue applied an improved SVPWM algorithm based on the adjustment of short vector to restrain the neutral point potential fluctation.The simulation result proved the correctness of control strategy.The results also demonstrate that it was theoretically feasible to utilize high-voltage convertor topology in wind power generation systems.

关 键 词：风力发电系统 三电平中点箝位式变换器 中点电位 

分 类 号：TM46[电气工程—电器]