Research on control strategy of microgrid with distributed PV and air source heat pumps

The microgrid with distributed PV and air source heat pump is studied, aim at the problem of controller saturation caused by the lag of the static switch and the mismatch between the operation mode and the control method, droop control is used in island mode and grid-connected mode, an improved pre-synchronization control algorithm is proposed to ensure the smooth transition of the microgrid transient in this paper. The simulation of the microgrid switching from the island mode to grid-connected mode shows that the improved pre-synchronization control strategy reduced the impact on microgrid and the main grid in grid-connected operation, and then the microgrid can be smoothly connected to the main grid; the simulation of the microgrid switching from the grid-connected mode to island mode shows that the microgrid inverter based on droop control can quickly get the information from the grid to ensure the microgrid operate normally and effectively when the fault appear in the grid.