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ISSN 0254-0096 CN 11-2082/K

太阳能学报 ›› 2022, Vol. 43 ›› Issue (7): 101-108.DOI: 10.19912/j.0254-0096.tynxb.2020-1199

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一种新型三相Buck-Boost光伏逆变器漏电流抑制研究

王立乔1, 林健1, 朱文通1, 张佳慕2, 董子亮1   

  1. 1.燕山大学电力电子节能与传动控制河北省重点实验室,秦皇岛 066004;
    2.北京强度环境研究所,北京 100076
  • 收稿日期:2020-11-06 出版日期:2022-07-28 发布日期:2023-01-28
  • 通讯作者: 王立乔(1974—),男,博士、教授,主要从事高频功率变换,大功率电力电子变流,可再生能源发电,分布式发电系统等方面的研究。brent@ysu.edu.cn
  • 基金资助:
    国家自然科学基金(51677162); 河北省自然科学基金(E2017203235)

RESEARCH ON LEAKAGE CURRENT SUPPRESSION OF A NEW THREE-PHASE BUCK-BOOST PHOTOVOLTAIC INVERTER

Wang Liqiao1, Lin Jian1, Zhu Wentong1, Zhang Jiamu2, Dong Ziliang1   

  1. 1. Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Qinhuangdao 066004, China;
    2. Beijing Institute of Strength and Environment, Beijing 100076, China
  • Received:2020-11-06 Online:2022-07-28 Published:2023-01-28

摘要: 漏电流问题是限制非隔离型光伏逆变器广泛使用的关键因素之一。为解决该问题,提出一种可应用于光伏系统的新型三相Buck-Boost逆变器。首先介绍该逆变器的拓扑结构和工作原理,然后推导该拓扑在任意开关时刻共模电压的表达式,从而研究正弦脉宽调制(SPWM)和系统共模电压及漏电流之间的关系,并通过数学模型分析逆变器的升降压能力。最后通过实验平台对上述方案进行验证,实验结果证明了上述方案的有效性和可行性。

关键词: 非隔离型光伏逆变器, 漏电流, 正弦脉宽调制, 可升降压

Abstract: The common mode current is one of the key factors limiting the widespread use of transformerless PV inverters. Thus, A new three-phase Buck-Boost inverter which can be used in solar PV systems is proposed in this paper to solve this problem. This paper firstly introduces the topology of the inverter, analyzing its working principle, deriving the expression of its common-mode voltage at any operating mode. The influence of the Sinusoidal Pulse Width Modulation (SPWM) on common-mode voltage (CMV) existing in this inverter and leakage current are then analyzed. Finally, the above scheme is verified by the simulation and experimental setup. According to the results and data from the experiments, this new inverter is effective and feasible.

Key words: transformerless PV inverter, leakage current, SPWM, step-up/down

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