基于Z源逆变器光伏并网系统的共模漏电流抑制

刘汗青; 陶彩霞

刘汗青,陶彩霞.基于Z源逆变器光伏并网系统的共模漏电流抑制[J].电测与仪表,2019,56(12):26-32.
liuhanqing,Tao Caixia.Reduced common mode leakage current on PV grid-connected photovoltaic system based on Z-source network[J].Electrical Measurement & Instrumentation,2019,56(12):26-32.

基于Z源逆变器光伏并网系统的共模漏电流抑制

Reduced common mode leakage current on PV grid-connected photovoltaic system based on Z-source network

DOI：10.19753/j.issn1001-1390.2019.012.005

中文关键词: 共模电压漏电流 Z源逆变器光伏发电系统傅里叶变换

英文关键词:common-mode voltage leakage current, Z-Source inverter photovoltaic power system, modulated Fourier transform.

基金项目:国家重点研发计划资助（2017YFB1201003-020）

作者中文名	作者英文名	单位
刘汗青	liuhanqing	兰州交通大学
陶彩霞	Tao Caixia	兰州交通大学

摘要点击次数: 1350

中文摘要:

Z源逆变器（ZSI）及其衍生拓扑在光伏（PV）领域有着非常广泛的应用。在非隔离光伏并网系统中，共模电压（CMV）随着时间的变化会产生流经光伏电池板寄生电容的高频漏电流。本文通过对ZSI的CMV进行分析，提出了一种简单的用来减少ZSI中CMV谐波的方法。该方法是通过改变开关状态来实现的，并通过调制傅里叶变换(MFT)，将该方法调制后的CMV与传统ZSI中的CMV在频域范围内进行了比较。并通过对lkW ZSI进行仿真，验证了该方法的参考价值。

英文摘要:

Z source inverter (ZSI) and its derivative topologies are widely used in photovoltaic (PV) field. In the non-isolated pv grid-connected system, the common mode voltage (CMV) changes over time, resulting in high-frequency leakage current flowing through the stray capacitance of the PV panels. By analyzing the CMV of ZSI, this paper proposes a simple method to reduce the CMV harmonics in ZSI. This method is realized by changing the state of the switch and by modulating the Fourier transform (MFT), the CMV of this method is compared with the CMV in the traditional ZSI in frequency domain. The The reference value of this method are verified through the simulation of a lkW ZSI.

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