Abstract
The control strategy is one of the key technologies to ensure the security and stability operation of micro-grid. This paper studies the grid connected/islanding operation control strategy of micro-grid system with energy storage device. In the grid-connected mode, the outer voltage loop and inner current loop strategy is adopted for the grid-connected inverters. In the island mode, the V/f control strategy with the battery system is used to ensure the voltage and frequency of PV system to be stable. In order to reduce the steady state error on tracking the AC voltage, improved V/f control strategy based on double closed-loop quasi PR control strategy is proposed, with which the zero steady-state error control can be achieved in wider frequency band. Meanwhile, the fluctuation of PCC bus voltage is reduced effectively and the power quality is improved. The simulation results verify the effectiveness of the proposed control strategy.
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