Research on Off Grid / Grid Switching Control Strategy of Micro-grid Power Converter System

doi:10.11985/2019.02.016

Abstract

Abstract:

In order to solve the problems of voltage fluctuation and large switching impulse current in the off-grid to grid switching mode of micro-grid power converter system, a phase synchronization controller based on state following and off grid/grid switching control strategy is proposed. The output of the V/f controller follows the output of the P/Q controller, and the phase synchronization module is introduced to synchronize the phase angle of the off-grid and the grid-connected phase angle. Finally, the Matlab/Simulink simulation model of the storage grid converter is established. Simulation results show that the proposed method can effectively suppress voltage fluctuation and reduce switching impulse current during off grid/grid switching.

Key words: Power converter system, off grid/grid connection, controller state following, phase presynchronization

CLC Number:

TM64

ZHU Zuobin,HUANG Shaoping,LI Zhenxing,XIAO Yinan. Research on Off Grid / Grid Switching Control Strategy of Micro-grid Power Converter System[J]. Journal of Electrical Engineering, 2019, 14(2): 92-96.

Figures/Tables 10

References 13

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参数	值	参数	值
P_ref/kW	-20	L/kH	3
Q_ref/var	0	R/Ω	0.01
U_d_ref/V	311	C/F	3.3
U_q_ref/V	0	负荷/kW	20
C₁/mF	8