A Novel Low Voltage Ride Through Control Method for Current Source Grid-Connected Photovoltaic Inverters

被引：25

作者：

Geng, Yiwen ^{[1
]}

Yang, Ke ^{[1
]}

Lai, Zou ^{[1
]}

Zheng, Pengfei ^{[1
]}

Liu, Haiwei ^{[1
]}

Deng, Renxiong ^{[1
]}

机构：

[1] China Univ Min & Technol, Sch Elect & Power Engn, Xuzhou 221116, Jiangsu, Peoples R China

来源：

IEEE ACCESS | 2019年 / 7卷

基金：

中国国家自然科学基金;

关键词：

Current source inverter (CSI); photovoltaic application; low voltage ride through (LVRT); grid voltage sag;

D O I：

10.1109/ACCESS.2019.2911477

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

Due to their inherent topology characteristic, current source grid-connected photovoltaic inverters cannot realize low voltage ride through (LVRT) during a serious sag in the grid voltage. Based on mathematical models of three-phase current source grid-connected photovoltaic (PV) inverters, this paper analyzes quantitatively the relationship between steady-state DC-link current and grid voltage, and also derives the steady-state working range of the DC-link current in CSIs. Based on the steady-state working range of the DC-link current and the native characteristics of PV cells, this paper indicates the fundamental reason that three-phase current source inverter cannot realize LVRT. To solve this problem, an improved topology of a current source grid-connected photovoltaic inverter is adopted in this paper, where a chopper circuit is added in the DC link. Meanwhile, a novel control strategy is further proposed to realize LVRT under balanced and unbalanced grid voltage conditions. Finally, the simulation and experiment results verify the effectiveness of the proposed method.

引用

页码：51735 / 51748

页数：14

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