Voltage and power management in AC micro-grids with exponential droop control

Microgrids are key elements for integrating various distributed energy resources (DERs). Conventionally, the real power-frequency droop control and the reactive power-voltage magnitude droop control are adopted in DERs. However, when the power is up to an extreme limit, the frequency and voltage must be cut off and the control strategies can no longer adopt the droop control but the PQ control. In this paper, the exponential real power-frequency droop control and the exponential reactive power-voltage magnitude droop control are proposed to solve the aforesaid problem. Additionally, the proposed control strategies are able to simply the network of the system and improve efficiency of the system. Their definition and control method are proposed and researched and the simulation results demonstrate the effectiveness of the proposed method.