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双Boost逆变器半周期调制策略研究

DOI: 10.13334/j.0258-8013.pcsee.2014.36.005, PP. 6407-6414

Keywords: 宽电压,半周期调制,单级升降压,逆变器

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Abstract:

可再生能源发电系统由于受环境因素的影响,其输出电压范围较宽,需要逆变器能够适应宽范围的电压输入。双Boost逆变器能够实现单级升降压逆变,具有电路结构简单、功率器件少等优点。然而传统的调制策略中所有功率开关在整个工频周期中均处于高频开关状态,同时承受较大的电压电流应力,导通损耗和开关损耗大,系统效率低。提出一种半周期调制策略,使功率开关工作于半周期高频调制状态,减小了器件导通和开关损耗。对两种调制策略下电压电流应力进行对比分析,设计一台400W原理样机,并通过仿真和实验验证半周期调制策略的优点。

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