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具有大范围升-降压功能的新型单级逆变电路

, PP. 73-80

Keywords: Z源逆变器,准Z源逆变器,单级逆变电路,高升压增益

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Abstract:

提出一种具有大范围升-降压功能的单级逆变电路,简称高升压增益单级逆变器(HVRSSI)。研究了其具体的工作模式和升-降压功能的实现机理,推导了电路各部分的电压关系。该变换器利用独特的LC结构代替了传统电压源逆变器直流侧的电容,利用逆变器上下管的“直通”实现了直流链电压VPN的大范围升压功能,同时提高了逆变器的可靠性。和现有单级逆变电路(譬如ZSIs)不同,HVRSSI电路的升压比B和直通占空比Dsh成反比,在较小的直通占空比时能够得到较高的升压比,克服了Z源逆变器等受“直通占空比Dsh和调制因子M相互制约”的限制而升压能力不足的缺陷。高升压增益逆变电路输出交流电压随调制因子M的变化趋势和传统电压源逆变器一致,随M的增大而增大,不同于其他单级逆变器,该一致性使得调节更快捷。通过实验室设计的1kW样机对所提电路进行相关性能检测,实验结果与理论分析和仿真研究完全符合,验证了所提变换器的有效性和实用性。

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