COMMON-GROUND FIVE-LEVEL PHOTOVOLTAIC INVERTER BASED ON SWITCHED-CAPACITOR

被引：0
|
作者：
Wang J. [1 ]
Wang X. [1 ]
Ye Y. [1 ]
机构：
[1] School of Automation, Guangdong University of Technology, Guangzhou
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2023年 / 44卷 / 06期
关键词：
common-ground; inverter; multilevel; photovoltaic; switched-capacitor;
D O I：
10.19912/j.0254-0096.tynxb.2022-0225
中图分类号：
学科分类号：
摘要：
In order to meet the requirements of voltage boosting and leakage current elimination in grid-connected photovoltaic inverters，a common-ground five-level inverter based on switched-capacitor （SC） is proposed in this paper. The proposed topology possesses the advantages of self-boosting voltage，less components，capacitor voltage self-balance and scalability etc. Meanwhile，the leakage current caused by the common mode voltage （CMV） is eliminated by the common-ground structure，thereby reducing the electromagnetic interference and power loss of the inverter，and improving the safety of the system. Then，a hybrid modulation strategy with phase-shifted carriers is adopted to prevent the switched-capacitor from continuously discharging，which not only reduces the voltage ripple of the switched-capacitor，but also improves the quality of SPWM output voltage waveform. Furthermore，the advantages of the proposed topology have been demonstrated by comparing with other five-level topologies in terms of the circuit structure，voltage-boosting capability and reducing capacitor voltage. Finally，the feasibility of the proposed inrerter and the effectiveness of the hybrid modulation strategy are verified experimentally. The results show that the proposed inverter has better static and dynamic characteristics as well as higher conversion efficiency. © 2023 Science Press. All rights reserved.
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页码：234 / 241
页数：7
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