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1k W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。
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 Dsh are inversely proportional. A greater boost factor can be obtained with a small shoot-through duty cycle Dsh, hence the direct interactive relationship between shoot-through duty cycle Dsh 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 1k W proposed inverter prototype are given for hardware verification. The theoretical analysis and simulation agrees well with experimental results.
出处
《电工技术学报》
EI
CSCD
北大核心
2014年第10期73-80,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51477079)
山东省自然科学基金(ZR2013EEM020)
中国博士后科学基金(2013M531598)资助项目
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
Z-source inverter(ZSI),quasi-Z-source inverter,single-stage inverter,high voltage ratio
