Abstract:
Aiming at the hybrid independent microgrid supported by current source and voltage source converters,a novel droop control strategy is proposed,which is suitable for the power control of independent microgrids supported by hybrid systems with current source and voltage source converters.Among them,the voltage source converter still adopts traditional P-f and Q-V droop control,while the current source converter simulates the magnitude of active current by projecting a virtual current vector in the voltage directional axis direction.Based on the duality of voltage source reactive power droop control,combined with the coupling characteristics between dq-axis physical quantities,the reactive current is calculated by d-axis voltage,which realizes the distributed control of reactive power without detecting reactive power.The current source can realize reasonable power distribution with the voltage source only through the current loop.The stability of the system is analyzed by establishing a small-signal model.Finally,the effectiveness of the control strategy and parameter design proposed in this paper is verified through simulations.