多电平变流器在风力发电系统中的应用  

Multi-level Converter Applied to Wind Power Generation System

作　　者：康劲松[1] 张烨[1] 

机构地区：[1]同济大学电气工程系,上海市杨浦区200092

出　　处：《中国电机工程学报》2009年第24期20-25,共6页Proceedings of the CSEE

基　　金：同济大学青年优秀人才培养行动计划资助(0800219034)

摘　　要：对多电平变流器中的中点电位不平衡机理进行分析,提出一种能有效抑制中点电位偏移的控制算法。利用Matlab/Simulink仿真软件构建了风力机模型、多电平PWM整流器模型、具有抑制中点电位不平衡控制的多电平逆变器模式,建立了完整的背靠背直驱型风力发电系统。通过仿真分析,验证了所提出抑制中点电位偏移控制策略的实用性和可行性,多电平变流器中点电位偏移问题被有效抑制,并且在低开关频率条件下,具有输出谐波含量低、输出波形好的特性,适合应用于高压大功率风力发电系统。The neutral-point unbalancing problem is analyzed and the control strategy is proposed which can inhibit the neutral-point shift. The complete back-to-back direct-drive wind power generation system including wind turbine model, PWM rectifier control model, multi-level inverter with the neutral balancing control strategy are established through the Matlab/Simulink software. The simulation results confirm that the strategy is practicable and feasible. Neutral-point shift in multi-level converters is effectively inhibited. At low switching frequency conditions, the output harmonic content is low, and output waveforms have a good quality. Multi-converters are suitable for high-voltage high-power application of wind power generation system.

关 键 词：多电平变流器 风力发电系统 中点电位偏移 

分 类 号：TM921[电气工程—电力电子与电力传动]