DocumentCode :
666026
Title :
Stability control method based on virtual inductance of grid-connected PV inverter under weak grid
Author :
Guihua Liu ; Yulin Yang ; Pangbao Wang ; Wei Wang ; Dianguo Xu
Author_Institution :
Dept. of Electr. Eng. & Autom., Harbin Inst. of Technol., Harbin, China
fYear :
2013
fDate :
10-13 Nov. 2013
Firstpage :
1867
Lastpage :
1872
Abstract :
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.
Keywords :
impedance matching; invertors; phase locked loops; photovoltaic power systems; power generation control; power grids; power system stability; stability criteria; synchronisation; PV grid power system stability; SOGI-PLL; current-source PV power generation system; grid synchronization method; grid-connected current quality; high grid-connected current harmonics; high impedance characteristics; impedance matching; output impedance model; photovoltaic power generation system stability; second-order generalized integrator phase locked loop; single-phase grid-connected PV inverter; stability control method; system stability criteria; virtual inductance; weak grid; Circuit stability; Impedance; Inductance; Inverters; Power system stability; Stability criteria; PV grid-connected power generation system; current harmonics; stability; virtual inductance; weak grid;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Electronics Society, IECON 2013 - 39th Annual Conference of the IEEE
Conference_Location :
Vienna
ISSN :
1553-572X
Type :
conf
DOI :
10.1109/IECON.2013.6699416
Filename :
6699416
Link To Document :
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