Third harmonic compensation strategy for a quasi-Z-source cascaded multilevel photovoltaic grid-connected inverter

被引：0
|
作者：
Chen Y. [1 ,2 ]
Huang K. [1 ]
Cao Z. [1 ]
机构：
[1] College of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing
[2] Chongqing Industrial Big Data Innovation Center Co., Ltd., Chongqing
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2023年 / 51卷 / 09期
基金：
中国国家自然科学基金;
关键词：
over modulation; power imbalance; quasi-Z source cascaded multilevel; third harmonic compensation;
D O I：
10.19783/j.cnki.pspc.221394
中图分类号：
学科分类号：
摘要：
Problems such as occlusion and aging of photovoltaic modules can cause power imbalance between single-phase quasi-Z-source cascaded multilevel inverters. In severe cases, units with larger power will be over-modulated, resulting in grid-connected current distortion and even affecting system stability. To address this problem, a model of a single-phase quasi-Z-source cascaded multilevel inverter is analyzed, and the over-modulation mechanism and optimal third harmonic injection principle are expounded. An optimized third harmonic compensation control strategy is proposed. This method can not only ensure the maximum power output of the system and the balance of DC bus voltage between units, but also select the optimal third harmonic compensation coefficient according to the fitting curve, expand the operating range of the inverter, ensure that all units are not modulated when the power imbalance is serious. The effect of suppressing the grid-connected current distortion is evident. Simulation and experimental results verify the effectiveness of the proposed control strategy. © 2023 Power System Protection and Control Press. All rights reserved.
引用
收藏
页码：147 / 155
页数：8
相关论文
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