Evaluation of quasi-resonant dc-link technique on generalized three-level inverter

I. Lok, M. Wong
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Abstract

This paper presents a combination of a quasiresonant dc-link (QRDCL) inverter and a generalized three-level inverter. QRDCL inverter can decrease the dc-link voltage to zero in order to provide a zero voltage condition for the power devices. The voltage stresses of the power devices can be released and the switching losses of the inverter can be reduced under zero-voltage switching (ZVS). Generalized multilevel inverter topology provides an alternative way in high level inverter implementation. The generalized multilevel inverter is constructed by several basic cells which enable a higher flexibility in extending the levels of inverter, and moreover it gives the inverter a self voltage balancing ability without any assistance from extra circuits. Control strategy of a generalized three-level QRDCL inverter is proposed. Switching losses of the inverters are also presented to prove the feasibility of a generalized three-level QRDCL inverter.
广义三电平逆变器的准谐振直流技术评价
本文提出了一种准谐振直流链路(QRDCL)逆变器与广义三电平逆变器的组合。QRDCL逆变器可以将直流链路电压降至零,从而为功率器件提供零电压条件。在零电压开关(ZVS)下,可以释放功率器件的电压应力,降低逆变器的开关损耗。广义多电平逆变器拓扑为实现高电平逆变器提供了另一种方法。广义多电平逆变器由多个基本单元构成,使逆变器的电平扩展具有更高的灵活性,并且使逆变器具有自平衡电压的能力,无需任何额外电路的辅助。提出了一种广义三电平QRDCL逆变器的控制策略。同时给出了逆变器的开关损耗,证明了广义三电平QRDCL逆变器的可行性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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