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中点钳位型三电平逆变器脉宽调制时的损耗特性

, PP. 124-131

Keywords: 三电平,逆变器,脉宽调制,损耗

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Abstract:

随着多电平逆变器的大量应用,电力电子开关器件的损耗问题也越来越得到重视。对开关器件的损耗研究,不单是提高效率的前提,更是保证器件安全工作的首要条件。三电平逆变器的开关器件多,导通与换流模式复杂,损耗分析比两电平逆变器困难。本文在分析三电平逆变器导通与换流模式的基础上,利用器件的损耗特征参数,在SPWM调制策略下对逆变器的通态损耗和开关损耗进行了计算,给出了该调制策略下的器件损耗对于调制度和功率因数角的分布曲面,并对其他调制策略下的损耗进行了计算分析,最后实验验证了该损耗计算方法的有效性。本文给出的损耗模型和结论为进一步降低损耗的调制策略研究奠定了基础。

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