Stability Control Method Based on Virtual Inductance of Grid-Connected PV Inverter under Weak Grid

被引：0
|
作者：
Liu, Guihua [1 ]
Yang, Yulin [1 ]
Wang, Pangbao [1 ]
Wang, Wei [1 ]
Xu, Dianguo [1 ]
机构：
[1] Harbin Inst Technol, Dept Elect Engn & Automat, Harbin 150006, Peoples R China
来源：
39TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY (IECON 2013) | 2013年
关键词：
PV grid-connected power generation system; weak grid; stability; virtual inductance; current harmonics; LOAD IMPEDANCE SPECIFICATION; POWER;
D O I：
暂无
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
High impedance characteristics of weak grid can easily lead to some problems such as poor stability of photovoltaic (PV) power generation system, high grid-connected current harmonics and so on. For solving these problems, this paper establishes a system stability criteria based on impedance matching for current-source PV power generation system, deduces the output impedance model of single-phase grid-connected PV inverter, and studies the impact of weak grid on inverter stability and grid-connected current harmonics. Then proposes a control method based on virtual inductance for increasing the output impedance of inverter to improve the system stability, and adopts a grid synchronization method based on second-order generalized integrator phase locked loop (SOGI-PLL) to improve the quality of the grid-connected current. Finally, simulation and experimental results verify that the proposed method can effectively improve the stability of PV grid power system and reduce the grid-connected current harmonics under weak grid.
引用
收藏
页码：1867 / 1872
页数：6
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