具有大范围升-降压功能的新型单级逆变电路

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摘要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V_PN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D_sh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D_sh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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	丁新平
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	薛必翠
	张民

关键词 ： Z源逆变器, 准Z源逆变器, 单级逆变电路, 高升压增益

Abstract：This paper presents a high voltage ratio single-stage inverter (HVRSSI). Utilizing a unique LC structure instead of the traditional voltage source inverter DC link capacitor C yields a single-stage inverter with high step-up capability. The specific operating mode and buck-boost function implementation mechanism are studied. The shoot-through state is used to achieve substantial boost function of DC link peak voltage, and meanwhile improves the reliability of inverter. Unlike existing traditional single-stage inverter(ZSI), boost factor B of the proposed inverter and the shoot-through duty cycle D_sh are inversely proportional. A greater boost factor can be obtained with a small shoot-through duty cycle D_sh, hence the direct interactive relationship between shoot-through duty cycle D_sh and modulation index M is fundamentally overcame. Consistent with the traditional voltage source inverter, the output AC voltage of proposed high step-up inverter increases with the increasing of the M, which is different from the other single-stage inverters, and the consistency makes more rapid adjustment. Experimental results of the 1kW proposed inverter prototype are given for hardware verification. The theoretical analysis and simulation agrees well with experimental results.

Key words： Z-source inverter(ZSI) quasi-Z-source inverter single-stage inverter high voltage ratio

收稿日期: 2013-10-25 出版日期: 2014-11-05

PACS:

TM46

基金资助:国家自然科学基金（51477079）,山东省自然科学基金（ZR2013EEM020）和中国博士后科学基金（2013M531598）资助项目

作者简介: 丁新平男,1975年生,博士,副教授,主要研究方向为变频调速,分布式发电系统和高压大功率变流技术研究。张承慧男,1963年生,教授,博士生导师,主要从事电力电子技术及可控制科学与工程等方面的科研与教学工作。

引用本文:

丁新平, 张承慧, 薛必翠, 张民. 具有大范围升-降压功能的新型单级逆变电路[J]. 电工技术学报, 2014, 29(10): 73-80. Ding Xinping, Zhang Chenghui, Xue Bicui, Zhang Min. A Novel High Voltage Ratio Single-Stage Inverter with Buck-Boost Ability. Transactions of China Electrotechnical Society, 2014, 29(10): 73-80.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I10/73

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