基于旁路电容的L型滤波光伏并网逆变器漏电流抑制方法
发布时间：2018-09-08 09:06
【摘要】：传统无变压器非隔离光伏并网逆变器系统中,通常采用增加交流旁路开关或直流旁路开关的方式解决系统漏电流问题。然而系统中加入旁路开关增加了系统成本,同时需要增加旁路开关的驱动电路,系统电路结构和控制方式复杂。为了解决该问题,提出一种基于旁路电容的漏电流抑制方案。首先以典型L滤波的光伏逆变器为研究对象,在分析其共模模型的基础上,提出旁路电容法实现漏电流抑制,并对不同旁路电容对系统共模特性的影响进行分析。该方案通过引入旁路电容改变系统共模回路,有效地滤除共模电压高频分量,消除系统寄生电容电压高频分量,从而实现漏电流的有效抑制。最后对提出的方案进行仿真和实验研究,验证了提出方案的可行性和有效性。
[Abstract]:In the traditional unisolated PV grid-connected inverter system without transformer, the leakage current problem is usually solved by adding AC by-pass switch or DC by-pass switch. However, adding bypass switch to the system increases the cost of the system, and the drive circuit of the bypass switch is also needed. The system circuit structure and control mode are complex. In order to solve this problem, a leakage current suppression scheme based on bypass capacitance is proposed. Firstly, based on the analysis of the common mode model of the typical L-filter photovoltaic inverter, a by-pass capacitance method is proposed to suppress the leakage current, and the influence of different bypass capacitors on the common mode characteristics of the system is analyzed. By introducing bypass capacitance to change the common-mode circuit of the system, the high frequency component of the common-mode voltage can be effectively filtered, and the parasitic capacitance voltage of the system can be eliminated, thus the leakage current can be effectively suppressed. Finally, the feasibility and effectiveness of the proposed scheme are verified by simulation and experimental research.
【作者单位】： 燕山大学电气工程学院;
【基金】：国家自然科学基金(51477148) 河北省引进留学人员资助项目(CL201622) 河北省自然科学基金(E2015203407、E2016203156)资助项目
【分类号】：TM464;TM615
本文编号：2230073
[Abstract]:In the traditional unisolated PV grid-connected inverter system without transformer, the leakage current problem is usually solved by adding AC by-pass switch or DC by-pass switch. However, adding bypass switch to the system increases the cost of the system, and the drive circuit of the bypass switch is also needed. The system circuit structure and control mode are complex. In order to solve this problem, a leakage current suppression scheme based on bypass capacitance is proposed. Firstly, based on the analysis of the common mode model of the typical L-filter photovoltaic inverter, a by-pass capacitance method is proposed to suppress the leakage current, and the influence of different bypass capacitors on the common mode characteristics of the system is analyzed. By introducing bypass capacitance to change the common-mode circuit of the system, the high frequency component of the common-mode voltage can be effectively filtered, and the parasitic capacitance voltage of the system can be eliminated, thus the leakage current can be effectively suppressed. Finally, the feasibility and effectiveness of the proposed scheme are verified by simulation and experimental research.
【作者单位】： 燕山大学电气工程学院;
【基金】：国家自然科学基金(51477148) 河北省引进留学人员资助项目(CL201622) 河北省自然科学基金(E2015203407、E2016203156)资助项目
【分类号】：TM464;TM615
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