Research on Coordination Stability Control of Multi-Converter in Hybrid Power Distribution Network

In order to solve multi-converter control problems in ac/dc hybrid microgrid, such as “gap” problem in the process from grid-connected mode to islanding mode, and the low system immunity and stability when the ac/dc hybrid micro grid interface converter in droop control mode. This paper puts forward the coordination stability control strategy, energy storage converter in ac microgrid adopts VSG control and the distributed generation converters adopt MPPT control to solve “gap” problem in the process from grid-connected mode to islanding mode; DC microgrid adopts no communication lines connected control technology, independently to meet the energy balance inside the dc microgrid, and save the communication cost; AC/DC microgrid interface converter adopts bidirectional VSG control to improve the immunity and stability of the system compared the bidirectional droop control. The coordination stability control strategy of multi-converter in AC/DC hybrid microgrid this paper provided gives reference for the future ac/dc hybrid microgrid project implementation.