Three-Phase Quasi-Z-Source Inverter With Constant Common-Mode Voltage for Photovoltaic Application

被引：63
|
作者：
Noroozi, Negar [1 ]
Zolghadri, Mohammad Reza [2 ]
机构：
[1] Sharif Univ Technol, Tehran 113639363, Iran
[2] Sharif Univ Technol, Dept Elect Engn, Tehran 113639363, Iran
来源：
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | 2018年 / 65卷 / 06期
关键词：
Common-mode voltage (CMV); leakage current; odd pulse width modulation (PWM); photovoltaic (PV) power system; quasi-Z-source inverter (q-ZSI); POWER-SYSTEM; PULSEWIDTH MODULATION; LEAKAGE CURRENT; SUPPRESSION; CONVERTERS; TOPOLOGY; PWM; ELIMINATION; MICROGRIDS; REDUCTION;
D O I：
10.1109/TIE.2017.2774722
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
In trasformerless grid-connected photovoltaic (PV) systems, common-mode voltage (CMV) fluctuations cause leakage current flow through the stray capacitance of the PV panels. Shoot-through states in a quasi-Z-source inverter (q-ZSI) increase the amplitude of high-order harmonics of CMV. In this paper, by using the modulation technique based on odd pulse width modulation and minor change in the Z network of the three-phase q-ZSI, the leakage current is blocked. No extra semiconductor element is added. By the proposed technique, CMV is kept nearly constant during switching cycles. The experimental results for CMV analysis in a 1 kW prototype are presented to verify the theoretical analysis.
引用
收藏
页码：4790 / 4798
页数：9
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