多电平变流器在直驱型风电系统的应用研究  

Research on Multilevel Converter for Direct Drive Wind Power System

作　　者：黄瑛[1] 孙宝龙 李先允[1] 

机构地区：[1]南京工程学院电力工程学院,江苏南京211167 [2]北京国华三河发电有限责任公司,北京065201

出　　处：《东北电力大学学报》2010年第1期27-30,共4页Journal of Northeast Electric Power University

摘　　要：为满足直驱型风力发电系统对变流器的要求,采用了级联型多电平逆变器替代传统的两电平逆变器。通过仿真分析表明,以变化的风速为输入,采用最大风能捕获时,逆变器输出电压可追踪电网电压频率和相位,实现单位功率因数输出。采用载波相移的SPWM调制方法,输出电压波形好,产生的高频谐波方便滤除。级联型多电平逆变器作为全功率变流器适合于直驱型风力发电系统。To meet the needs of converters in the direct-drive wind power system ,traditional two-level inverter is replaced by the cascaded multilevel inverter. The simulation results shows that the output voltage can trace the frequency and phase of the grid. Carrier phase-shifting modulation based on SPWM improves the output current waveform,and the high-frequency harmonics current is easy to filter out. The cascaded multilevel converter is suitable for direct-drive wind power system.

关 键 词：直驱风电系统 级联型多电平变流器 载波相移 

分 类 号：TM614[电气工程—电力系统及自动化]