Leakage current suppression method of a three-level neutral point clamp photovoltaic inverter based on I-DPWM

被引：0

作者：

Chen G. ^{[1
]}

Gong C. ^{[2
]}

Zhu L. ^{[3
]}

Bao J. ^{[4
]}

Chen H. ^{[2
]}

Wang Z. ^{[1
]}

机构：

[1] School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai

[2] Shanghai University of Electric Power, Shanghai

[3] Shanghai Chint Power System Co., Ltd., Shanghai

[4] Shanghai Xilong Technology Co., Ltd., Shanghai

来源：

Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2023年 / 51卷 / 11期

关键词：

carrier modulation; I-; DPWM; leakage current suppression; three-level NPC inverter;

D O I：

10.19783/j.cnki.pspc.221140

中图分类号：

学科分类号：

摘要：

For three-level neutral point clamped photovoltaic inverters, a suppression method based on discontinuous pulse width modulation (DPWM) and with the selection of a specific vector for control, has shortcomings such as long calculation time of vector decomposition, large injection common-mode voltage component and large leakage current. In this paper, a leakage current suppression method based on I-DPWM for a three-level neutral point clamped photovoltaic inverter is proposed. The injected low-frequency common-mode voltage component is analyzed by calculating various DPWM equivalent modulation waves. Aiming at DPWM1, which has the lowest low-frequency common-mode voltage component, a new zero-sequence component is injected at the low-frequency common-mode voltage discontinuity point, and the leakage current amplitude is suppressed by reducing the low-frequency common-mode voltage. At the same time, a carrier is adopted to realize the DPWM, without complex vector operation. Finally, a simulation model of a 20 kW three-level neutral point clamp photovoltaic inverter is established on the Matlab/Simulink platform, and the effectiveness of the proposed method is verified by combining with the designed 125 W experimental prototype. © 2023 Power System Protection and Control Press. All rights reserved.

引用

页码：119 / 130

页数：11

共 28 条

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