Decentralized Coordinated Control of AC/DC Power Interface Via Adaptive Inverse Theory

With the large-scale access of new energy sources, the fluctuation and intermittence of new energy output are becoming more and more serious. Microgrid provides a new technical approach for large-scale application of renewable energy grid connected power generation. Because of the popularity of distributed power supply growth and DC load, single AC microgrid or DC microgrid are gradually unable to meet the requirements of power supply, and AC/DC hybrid microgrid integrated AC microgrid and DC microgrid advantages, has become one of the development trend of microgrid. The AC/DC power interface, which is composed of multiple parallel AC/DC bidirectional converters(BC), is very important to maintain the dynamic balance of power in the hybrid microgrid. This paper establishes a multi BCs mathematical model, and then put forward the decentralized coordination control strategy based on the theory of adaptive inverse control, realized in the maintenance of AC and DC bus voltage constant, the precise distribution of each converter power according to the rated capacity. Finally, the correctness and feasibility of the proposed control strategy are verified by MATLAB simulation platform.