Flexible Control Strategy for AC/DC Bus Interface Converter in Hybrid Microgrid

Abstract

To solve the problem of inertia loss in the isolated island operation mode of hybrid microgrid composed of distributed power sources, a flexible control strategy based on virtual inertia is proposed. The proposed control strategy can realize mutual support of AC side frequency and DC side voltage in the process of power flow. Firstly, the operating characteristics of AC subnets and DC subnets in hybrid microgrid are analyzed. Then, by comparing the difference between droop control and virtual inertia control, the flexible control strategy of bus interface converter based on virtual inertia is deduced by formula. Finally, a hybrid microgrid system level model was built in MATLAB/Simulink to verify the effectiveness of the proposed control method.