Power management of hybrid AC-DC microgrid with li-ion battery for pulse loads

This paper presents an improved power flow method with the help of Energy Storage for a Hybrid AC-DC Microgrid under the pulse load influence. The AC & DC sides of the micro grid are supplied by a synchronous generator and PV farm respectively. This proposed Microgrid works in autonomous mode i.e. islanding mode of operation. The AC & DC side grids are connected by a bidirectional AC-DC-AC inverter. The DC side is connected to a DC source and DC load whereas AC side is connected to a AC source and AC load. Under normal operation the entire hybrid system works normally, but when a load disturbance occurs on any side of the system, the entire system collapse. In order to overcome this load disturbances a Li-ion battery bank is connected to DC grid as an backup source. The coordinate control algorithms for smooth power control between the AC & DC grids for stable operation of the entire system under various loading conditions are proposed. The entire system is modelled using Matlab/Simulink software. The simulation results shows that the proposed system gives a stable operation of the system under pulse load influence in an islanding mode of operation.