容错三相四开关逆变器控制策略  

Control Strategy for Fault-tolerant Three-phase Four-switch Inverters

作　　者：安群涛[1] 孙醒涛[1] 赵克[1] 孙力[1] 

机构地区：[1]哈尔滨工业大学电气工程系,黑龙江省哈尔滨市150001

出　　处：《中国电机工程学报》2010年第3期14-20,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50477009)~~

摘　　要：三相四开关逆变器作为传统六开关逆变器的容错拓扑得到了广泛重视,然而其控制性能低于六开关逆变器。在深入分析四开关逆变器运行原理的基础上,研究四开关逆变器的空间矢量脉宽调制(space vector pulse width modulation,SVPWM)控制方法,揭示四开关SVPWM控制的本质是以2路相位相差60°电角度的正弦波为隐含调制函数的正弦脉宽调制(sinusoidal pulse width modulation,SPWM)控制。为减少器件的开关次数,提出四开关SVPWM的"七段式"实现方式。指出四开关SVPWM最大线性调制比只有六开关时的一半,为提高直流电源电压的利用率,提出基于补偿电压矢量的四开关逆变器SVPWM过调制方法。仿真和实验结果证明了所提算法的正确性和有效性。The three-phase four-switch inverter is being attached much importance as a fault-tolerant topology for traditional six-switch scheme, but its performance is lower than the latter. Based on analysis of the operation principle of four-switch inverters, space vector pulse width modulation （SVPWM） was studied and its essence was posted, that is a sinusoidal pulse width modulation （SPWM） using a triangle wave and two implicit sine waves whose phases are separated by 60° electrical angle. To reduce the number of power device switching, the implementation method of four-switch SVPWM with seven-segment scheme was presented. The maximal linear modulation ratio of four-switch SVPWM is half of the one in six-switch scheme, which is indicated as a conclusion. A compensatory voltage vector based overmodulation method for four-switch SVPWM was presented for improving the utilization ratio of the DC voltage. The simulation results as well as experimental ones illustrate the validity and efficiency of the proposed algorithm.

关 键 词：四开关逆变器 容错 空间矢量脉宽调制 调制函数 过调制 

分 类 号：TM464[电气工程—电器]