TITLE:
Research on Seamless Switching Control Strategy Based on Virtual Synchronous Generator
AUTHORS:
Wei Kang, Jibo Wan, Lixia Zhang, Qilong Zhang
KEYWORDS:
Virtual Synchronous Generator, PLL, Seamless Switching, Micro Grid
JOURNAL NAME:
Energy and Power Engineering,
Vol.9 No.4B,
April
6,
2017
ABSTRACT:
This paper studies the voltage, phase and current tracking strategy to eliminate voltage and current mutations when the virtual synchronous generator is switching between grid-connected and islanded. By using these strategies the inverter can realize secondary frequency regulation and voltage regulation. If the phase is near 0 or 2π a little disturbance may made the PLL output a big error, so a new PLL is proposed by this paper. A sine module is added in the PLL to avoid this error. In order to verify the strategy proposed by this paper a simulation model is built in Matlab/Simulink. The simulation results show that the control strategy can realize seamless switching.