电压源型逆变器改进的过调制法研究  

Study on improved overmodulation method for voltage source inverter

作　　者：方成辉[1] 王润新[1] 

机构地区：[1]上海海事大学物流工程学院,上海201306

出　　处：《现代电子技术》2015年第20期132-136,139,共6页Modern Electronics Technique

摘　　要：为提高三相两电平电压型逆变器的直流电压利用率,通过对空间矢量脉宽调制(SVPWM)原理进行详细分析,提出一种改进的过调制法。该方法通过改变参考电压矢量的轨迹及相应的合成策略,定义了一种新的比传统过调制法所得结果具有更大基波幅值的参考电压波形。仿真结果证明该方法在直流电压利用率及输出电压的总谐波畸变率(THD)两方面都较传统过调制法有优势。To improve DC voltage utilization ratio of three-phase two-level voltage source inverter,an improved overmodulation method is proposed by analyzing the principle of SVPWM in detail. By changing the track of reference voltage vector and the corresponding synthetic strategies,a new reference voltage waveform which has better fundamental voltage amplitude than the traditional overmodulation method is defined. The simulation results show that the improved method has more superiority than the traditional over-modulation method in the aspects of DC voltage utilization ratio and THD of output voltage.

关 键 词：直流电压利用率 电压型逆变器 过调制法 空间矢量脉宽调制 总谐波畸变率 

分 类 号：TM464[电气工程—电器]