Multi-microgrid system is complex in structure because of connecting in many different ways. In the process of connection or disconnection

due to the offset of voltage and frequency on bus

it will produce large electrodynamic force to system

which will decrease the stability. To solve the problem of the grid control accuracy and the frequency stabilization in such process

based on parallel structure of multimicriogrid

considering the voltage drop and phase offset of long haul line

an improved method is proposed to optimize the droop control to reduce the fluctuate of voltage and frequency. The parallel structure simulation model is established on Matlab/Simulink

and the results verify the rationality and effectiveness of the improved control strategy.