A research on droop control strategy and simulation for the micro-grid

Abstract

Micro-grid is a novel unit integrated by distributed generation access to distributed network, and it is also the trend of the development of the future. Suitable micro-grid control strategy design is the key for ensuring the stability of the micro-grid under different operation mode, especially when changing from the grid connected operation to the islanding operation. This paper presents a droop control model consists of the power control loop and the voltage-current close loop control algorithm required for a micro-grid system containing micro turbine, and designs the parameters of the voltage-current close loop controller to make the inverter output show inductance characteristic. According to the simulation, the designed multi-loop controller can achieve the smooth changing between the utility connected operation and the islanding operation, proving the effectiveness of the control strategy.