非隔离型光伏并网逆变器漏电流抑制机理分析与改进

TANG Ting

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非隔离型光伏并网逆变器漏电流抑制机理分析与改进

更新时间：2025-08-13

- 非隔离型光伏并网逆变器漏电流抑制机理分析与改进
- Automation of Electric Power Systems Vol. 37, Issue 18, Pages: 25-31(2013)
- 作者机构：
  
  南京航空航天大学自动化学院,江苏省,南京市,210016
- 作者简介：
- 基金信息：
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- Published：2013
- 稿件说明：
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TANG Ting. [J]. Automation of electric power systems, 2013, 37(18): 25-31.
DOI：

TANG Ting. [J]. Automation of electric power systems, 2013, 37(18): 25-31. DOI：

摘要

共模电流抑制是非隔离型光伏并网逆变器需要解决的首要问题。文中给出了单相逆变拓扑的共模回路统一等效模型，该模型将所有隔离类和非隔离类拓扑统一起来，适用于所有桥类拓扑的漏电流抑制机理分析。对现有桥类逆变拓扑按漏电流抑制机理进行了系统分析和归类。在此基础上，对H5拓扑、Heric拓扑及一种H6拓扑进行了改进。一方面，通过拓扑结构的改变，用共模电压恒定的漏电流抑制途径取代改变共模阻抗的抑制途径，漏电流抑制效果得以提高;另一方面，通过调制策略的优化，逆变器可以实现非单位功率因数运行。在一台5kW单相改进型H5拓扑并网逆变器上进行了实验研究，实验结果验证了理论分析的正确性。

Abstract

For transformerless photovoltaic（PV）grid-connected inverters，the leakage current needs to be suppressed to a specified range.According to the common leakage current analytical model for full-bridge and half-bridge structure inverters，the mechanism of leakage current elimination for commonly used inverters is systematically analyzed.Then the optimized topologies of H5，Heric and an H6-type configuration and their optimized modulation strategies are studied.By adopting a new scheme for leakage current suppression，the leakage current of these optimized inverters can be better eliminated;and with the proposed modulation strategies，the inverters will be able to operate in any power factors.Finally，the correctness of theoretical analysis is verified by the experimental results on a 5 kW optimized H5 prototype.

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