【摘要】：傳統(tǒng)無(wú)變壓器非隔離光伏并網(wǎng)逆變器系統(tǒng)中,通常采用增加交流旁路開(kāi)關(guān)或直流旁路開(kāi)關(guān)的方式解決系統(tǒng)漏電流問(wèn)題。然而系統(tǒng)中加入旁路開(kāi)關(guān)增加了系統(tǒng)成本,同時(shí)需要增加旁路開(kāi)關(guān)的驅(qū)動(dòng)電路,系統(tǒng)電路結(jié)構(gòu)和控制方式復(fù)雜。為了解決該問(wèn)題,提出一種基于旁路電容的漏電流抑制方案。首先以典型L濾波的光伏逆變器為研究對(duì)象,在分析其共模模型的基礎(chǔ)上,提出旁路電容法實(shí)現(xiàn)漏電流抑制,并對(duì)不同旁路電容對(duì)系統(tǒng)共模特性的影響進(jìn)行分析。該方案通過(guò)引入旁路電容改變系統(tǒng)共模回路,有效地濾除共模電壓高頻分量,消除系統(tǒng)寄生電容電壓高頻分量,從而實(shí)現(xiàn)漏電流的有效抑制。最后對(duì)提出的方案進(jìn)行仿真和實(shí)驗(yàn)研究,驗(yàn)證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.
【作者單位】： 燕山大學(xué)電氣工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(51477148) 河北省引進(jìn)留學(xué)人員資助項(xiàng)目(CL201622) 河北省自然科學(xué)基金(E2015203407、E2016203156)資助項(xiàng)目
【分類號(hào)】：TM464;TM615

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