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    三电平逆变器共模电压分析与抑制

    2016-03-03 中国测试高 芳, 高 锐
    摘  要:为抑制三电平逆变器共模电压,以二极管钳位式拓扑为例,分析其共模电压产生机理并提出一种抑制共模电压的简化三电平5段式空间矢量脉宽调制算法。该算法通过选取输出共模电压幅值小的基本电压矢量参与调制来抑制共模电压。仿真和实验结果表明,所提算法将共模电压最大幅值抑制到Vdc/6,比传统一般算法、抑制共模电压的7段式、7段式算法分别减少2/3,1/2,0,且可以克服上述3种算法输出共模电压幅值随其调制度变化而变化的缺点。
    关键词:二极管钳位式三电平逆变器;空间矢量脉宽调制;共模电压;5段式算法
    文献标志码:A     文章编号:1674-5124(2015)12-0106-05
    Common-mode voltage analysis and reduction for three-level inverter
    GAO Fang, GAO Rui
    (College of Engineering and Technology,Changchun Vocational Institute of Technology,Jilin 130033,China)
    Abstract: In order to reduce common-mode voltage of three-level inverter, this paper takes diode-clamped topology for instance, analyzes its common-mode voltage generation mechanism and proposes a simplified common-mode voltage reduction three-level five-segment space vector pulse width modulation algorithm(SVPWM). To reduce common-mode voltage, this algorithm selects proper basic voltage vectors to modulate. Simulative and experimental results show that, the proposed algorithm can suppress the maximum value of common-mode voltage to one sixth of DC voltage source value, and decrease respectively about two thirds, one second, zero comparing with traditional space vector modulation, seven-segment, five-segment algorithm. Meanwhile, it can overcome the disadvantage of common-mode voltage value varies with the modulation index of above three algorithms. 
    Keywords: diode-clamped three-level inverter; SVPWM; common-mode voltage; five-segment algorithm
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