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特定次谐波消除调制方式的谐波特性分析

, PP. 11-20

Keywords: 低开关频率,特定次谐波消除,谐波分析,转矩脉动

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Abstract:

在电力机车牵引传动系统中,受到最高开关频率以及输出电压、电流谐波性能的限制,无论是牵引逆变器还是辅助逆变器都广泛地采用特定次谐波消除调制方式(SHEPWM),以消除低次谐波。本文中对不同开关角分布下的SHEPWM在消除低次谐波后,高次电压谐波幅值随调制比的变化规律进行了分析,并以异步电机为例,对感性负载条件下的电流谐波以及引起的转矩脉动等都进行了详细的量化研究,从而可以更加准确地衡量SHEPWM的性能指标,并对相关采用SHEPWM的应用领域中滤波器的设计等问题提供参考依据。

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