大功率逆变器的非对称PWM方法  

Research on a new unsymmetrical PWM technique for large capacity inverter

作　　者：张冰 邱进 何妍 

机构地区：[1]国家电网电力科学研究院,湖北武汉430074

出　　处：《电力科学与技术学报》2009年第1期51-55,共5页Journal of Electric Power Science And Technology

摘　　要：介绍一种非对称PWM方法,它适用于灵活交流输电系统(FACTS)的大功率逆变器控制.该方法的特点是通过增加脉冲波形中不对称开关角的自由度数,来实现对特定谐波幅度和相位的直接控制.在较低的开关频率下,该方法可应用于大功率有源滤波器.通过Simplorer对基于该方法的并联补偿谐波电流的工作方式进行仿真,证明其有效性.A new unsymmetrical PWM technique is introduced in this paper, which is particularly applied to high-power inverter control in flexible AC transmission systems （FACTS）. The proposed pulse pattern possesses only half-wave inverse symmetry, but its quarter-wave symmetry is absent, the freedom degree of switching angles is doubled, the specific harmonics are thus controlled by their amplitudes and phase angles. In the lower switching frequency, the technique is designed for use in an active power filter. The good performance of this technique in harmonics compensation is verified by the simulation of a parallel compensator using Simplorer.

关 键 词：脉冲宽度调制 逆变器 灵活交流输电系统 谐波补偿 

分 类 号：TM464[电气工程—电器]