An Accurate Active Power Sharing Study in Virtual Flux Angle Droop Method

This paper investigates the problem of accurate active power sharing in virtual flux droop where flux angle droop control is used for DG controllers instead of traditional frequency droop control. Firstly, the virtual flux droop control method is introduced. Then, the reasons for inaccurate active power sharing in flux angle droop are analysed. Further, to solve this problem, an active power compensation sheme is added to flux angle droop control loop, which can achieve accurate active power sharing without affecting system stability. Finally, the proposed active power compensation strategy based on virtual flux droop is verified in a simplified microgrid model with two parallel DGs. The simulation results show that the proposed control strategy can achieve accurate power distribution and zero frequency deviation simutaneously and also has advantages of simple control and excellent dynamic and static performance.