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Performance improvement of pulse width‐amplitude modulation‐based quasi‐Z‐source inverters: Analysis and implementation
International Journal of Circuit Theory and Applications ( IF 2.3 ) Pub Date : 2020-06-17 , DOI: 10.1002/cta.2808
Mohammad Mohammadi 1 , Afshin Mirzaee 1 , Paolo Magnone 2 , Javad Moghani 1 , Paolo Mattavelli 2
Affiliation  

Pulse width‐amplitude modulation (PWAM) have been widely used in recent years to mitigate switching losses as well as reducing passive components' size. This paper precisely investigates this modulation approach in quasi‐Z‐source inverters (qZSI). It will be concluded that the existence of capacitive paths from load to source in such converters causes two undesired behaviors while utilizing PWAM, which increases total harmonic distortion and semiconductor stresses. Bypassing the capacitive paths is proposed in this paper to alleviate these issues. In order to implement this approach, a bidirectional quasi‐Z‐source inverter is studied. A design procedure is presented to achieve a fast dynamic response for tracking reference voltage. The operation of both conventional and bidirectional qZSI under different loads including resistive and resistive–inductive loads is investigated in the simulation and experiment. According to experimental results, by utilizing bidirectional qZSI, THD is improved from 12.34% to 3.51% for a lag load. Moreover, the voltage stress of the semiconductor no longer exists.

中文翻译:

基于脉宽幅度调制的准Z源逆变器的性能改进:分析与实现

近年来,脉冲宽度幅度调制(PWAM)已被广泛使用,以减轻开关损耗并减小无源元件的尺寸。本文精确地研究了准Z源逆变器(qZSI)中的这种调制方法。可以得出结论,在这种转换器中,从负载到电源的电容路径的存在会导致两种不希望有的行为,这会增加PWAM的总谐波失真和半导体应力。本文提出绕过电容路径来缓解这些问题。为了实现这种方法,研究了双向准Z源逆变器。提出了一种设计程序,以实现用于跟踪参考电压的快速动态响应。在仿真和实验中,研究了常规和双向qZSI在不同负载(包括电阻负载和电阻感应负载)下的运行情况。根据实验结果,通过使用双向qZSI,对于滞后负载,THD从12.34%提高到3.51%。此外,半导体的电压应力不再存在。
更新日期:2020-06-17
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