Analysis of Non-isolated Cascaded Dual-buck Grid-connected Inverter and Its Leakage Current Suppression

被引：0

作者：

Dai Y. ^{[1
]}

Zhang R. ^{[2
]}

Xie K. ^{[1
]}

Wang Y. ^{[1
]}

He J. ^{[1
]}

机构：

[1] School of Electrical Engineering, Southwest Petroleum University, Chengdu

[2] College of Electrical Engineering, Sichuan University, Chengdu

来源：

Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 07期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Cascaded grid-connected inverter; Common-mode equivalent model; Common-mode voltage; Dual-buck grid-connected inverter; Dual-carrier sinusoidal pulse width modulation; Leakage current;

D O I：

10.13336/j.1003-6520.hve.20190385

中图分类号：

学科分类号：

摘要：

To suppress the leakage current of traditional dual-buck grid-connected inverters, a novel non-isolated cascaded dual-buck grid-connected inverter topology (CDBGCI) and dual-carrier sinusoidal pulse width modulation (DCSPWM) strategy were proposed. The high-frequency and low-frequency common-mode equivalent models of CDBGCI were established by the method of common-mode equivalent circuit, and the high-frequency and low-frequency common-mode leakage currents of the inverters are analyzed in detail, respectively. The research results show the high-frequency common-mode voltage of the novel cascaded inverter keeps a constant value during a power frequency period, and the leakage current is less than 300 mA, so the high-frequency common-mode current is effectively suppressed. Meanwhile, compared with asymmetric CDBGCI, symmetric CDBGCI has a smaller low-frequency common-mode leakage current, and the high-frequency common-mode leakage current can be suppressed when n dual buck grid-connected inverters are cascaded. Finally, the results can provide references for the research of cascade grid-connected inverter topology and leakage current suppression. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：2434 / 2443

页数：9

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