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基于I-DPWM的三电平中点钳位光伏逆变器漏电流抑制方法
引用本文:陈 果,龚春阳,朱丽华,包 俊,陈 辉,王志新. 基于I-DPWM的三电平中点钳位光伏逆变器漏电流抑制方法[J]. 电力系统保护与控制, 2023, 51(11): 119-130
作者姓名:陈 果  龚春阳  朱丽华  包 俊  陈 辉  王志新
作者单位:1.上海交通大学电子信息与电气工程学院,上海 200240;2.上海电力大学,上海 200090;3.上海正泰电源系统有限公司,上海 200210;4.上海禧龙科技股份有限公司,上海 201517
基金项目:国家重点研发计划项目资助(2018YFB1503001);上海市科委科技计划项目资助(21DZ1207300);上海市经信委工业强基计划项目资助(GYQJ-2022-1-14)
摘    要:对于三电平中点钳位光伏逆变器,基于断续脉宽调制(discontinuous pulse width modulation, DPWM)并通过选择特定矢量进行钳位控制的方法,存在矢量分解计算时间长、注入共模电压分量和漏电流过大等不足。对此,提出了一种基于I-DPWM的三电平中点钳位光伏逆变器漏电流抑制方法。通过计算各类DPWM等效调制波来解析注入的低频共模电压分量。针对低频共模电压分量最小的DPWM1,在低频共模电压不连续点注入新的零序分量,通过减小低频共模电压来抑制漏电流幅值。同时,采用载波实现DPWM,免去了复杂的矢量运算。最后,在Matlab/Simulink平台建立了20 kW三电平中点钳位光伏逆变器的仿真模型,同时结合所设计的125 W实验样机验证了所提方法的有效性。

关 键 词:三电平中点钳位型逆变器;漏电流抑制;I-DPWM;载波调制
收稿时间:2022-07-18
修稿时间:2023-03-24

Leakage current suppression method of a three-level neutral point clampphotovoltaic inverter based on I-DPWM
CHEN Guo,GONG Chunyang,ZHU Lihu,BAO Jun,CHEN Hui,WANG Zhixin. Leakage current suppression method of a three-level neutral point clampphotovoltaic inverter based on I-DPWM[J]. Power System Protection and Control, 2023, 51(11): 119-130
Authors:CHEN Guo  GONG Chunyang  ZHU Lihu  BAO Jun  CHEN Hui  WANG Zhixin
Affiliation:1. School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Shanghai University of Electric Power, Shanghai 200090, China; 3. Shanghai Chint Power System Co., Ltd.,Shanghai 200210, China; 4. Shanghai Xilong Technology Co., Ltd., Shanghai 201517, China
Abstract: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.
Keywords:three-level NPC inverter   leakage current suppression   I- DPWM   carrier modulation
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