电工技术学报  2017, Vol. 32 Issue (增刊2): 103-110    DOI: 10.19595/j.cnki.1000-6753.tces.L70162
电力电子与电力传动 |
级联H桥逆变器漏电流分析与抑制
王付胜, 于世能
合肥工业大学电气与自动化工程学院 合肥 230009。
Analysis and Suppression of the Leakage Currents in the Cascaded H-Bridge Inverter
Wang Fusheng, Yu Shineng
School of Electrical Engineering and Automation Hefei University of Technology Hefei 230009 China
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摘要 针对非隔离型级联H桥逆变器的漏电流问题,首先建立带有寄生电容参数的逆变器共模等效模型,分别分析单电感电路与对称电感电路中漏电流的特点及其影响因素,指出在对称电感电路中通过优化调制策略可以有效抑制系统漏电流,而在单电感电路中调制手段无法解决漏电流问题。为此针对对称电感电路提出一种改进型载波层叠多电平调制策略,能够有效地抑制系统漏电流,而且实现简单、运算量小。最后仿真与实验结果验证了该方法的有效性与正确性。
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王付胜
于世能
关键词 非隔离型光伏系统级联型H桥逆变器漏电流调制策略载波层叠调制    
Abstract:Aimed at the leakage current issue of the transformerless cascaded H-bridge inverter, this paper first establishes the equivalent common-mode circuit of the inverter with the parasitic capacitance, and analyzes the characteristics of leakage current in the symmetrical and asymmetrical inductance circuit respectively. The analysis shows that the leakage current can be eliminated through optimizing the modulation methods in the symmetrical circuit, but in the asymmetrical circuit the leakage current issue cannot be solved through modulation strategies. For this reason a new modulation strategy for the symmetrical circuit based on the multicarrier pulse width modulation is proposed which can eliminate the leakage current effectively with simple implementation. Finally, the validity and effectiveness of the proposed method is verified by the simulation and experiment.
Key wordsTransformerless photovoltaic (PV) systems    cascaded H-bridge inverter    leakage current    modulation strategy    multicarrier pulse width modulation   
收稿日期: 2016-08-14      出版日期: 2017-11-14
PACS: TM464  
基金资助:光伏微电网关键技术研究及逆变设备研制资助项目(2015AA050607)
通讯作者: 王付胜 男,1976年生,副教授,研究方向为大型光伏并网发电、 大功率风力发电用并网变流器。E-mail: 10748451@qq.com。   
作者简介: 于世能 男,1992年生,硕士研究生,研究方向为级联多电平光伏并网变换器及其控制。 E-mail: 1584942631@qq.com。
引用本文:   
王付胜, 于世能. 级联H桥逆变器漏电流分析与抑制[J]. 电工技术学报, 2017, 32(增刊2): 103-110. Wang Fusheng, Yu Shineng. Analysis and Suppression of the Leakage Currents in the Cascaded H-Bridge Inverter. Transactions of China Electrotechnical Society, 2017, 32(增刊2): 103-110.
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