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中文摘要：
分析了4种三电平调制策略：载波同相层叠策略（PD-PWM）,载波反相层叠策略（POD-PWM）,载波同相交叠策略（COPWM-A）和载波反相交叠策略（COPWM-B）的基本原理,并从中点电压波动、输出相电压基波幅值及总谐波失真（THD）特性3方面对4种策略进行了对比研究。得到2个结论：1）4种策略中,载波交叠策略引起的中点电压波动小,输出电压基波幅值大,但含有低次谐波多,THD较大;2）载波反相调制策略（POD-PWM和COPWM-B）比载波同相调制策略（PD-PWM和COPWM-A）相电压THD特性好,但线电压THD特性差。实验结果验证了分析的正确性。
英文摘要：
Four kinds of three-level carrier-based PWM strategies which are called phase disposition pulse widthmodulation（PD-PWM）,phase opposition disposition pulse width modulation（POD-PWM）,carrier overlappingpulse width modulation strategy A（COPWM-A） and carrier overlapping pulse width modulation strategy B（COPWM-B）were evaluated in three aspects：influence to the neutral point（NP）potential fluctuation,fundamentalamplitude and output total harmonic distortion（THD）performance. The analysis shows that：1）In all of the fourstrategies,CO-PWMA and CO-PWMB have smaller NP potential fluctuation,larger fundamental amplitude whereasworse THD performance,2）In all of the four strategies,POD-PWM and CO-PWMB have better phase voltage THDperformance whereas worse line voltage THD performance. Experimental results prove the correctness of the analysis.
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