...级联型逆变器；多电平；谐波特性；电压利用率 [gap=1043]Key words：cascade inverter；multilevel；harmonic characteristics；utilization ratio of voltage ...
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Through the comparison among the three methods, the COPWM-A method shows the best harmonic characteristics.
通过对三类PWM方法谐波性能的比较，得出了COPWM - A调制方法输出线电压的谐波性能最优的结论。
According to the harmonic characteristics of electric locomotive typed SS4 under typical operating situations, the current module of harmonic source is proposed.
依据ss4型电力机车在典型工况下的谐波特点，提出了谐波源的电流模型。
Based on the site investigation and testing, summary and evaluation of the harmonic characteristics of typical nonlinear loads, and the effective solutions of harmonic elimination are presented.
结合现场调研测试，总结评估了典型非线性负载的谐波特性，并给出谐波治理的有效方案。
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