Research on Distributed Cooperative Control Strategy Based on Hierarchical Control of Microgrid

In order to meet the requirements of precise power allocation for stable economic operation of microgrid systems, a distributed collaborative control strategy based on hierarchical microgrid is proposed in this paper. Considering the droop stability control of the parallel inverters as the first-level basic control layer, the second-level distributed voltage correction control strategy is designed to overcome the first-order voltage offset problem. At the same time, the power generation cost of the micro-source is selected as the objective function and the power matching of the micro-sources and load-demand are regarded as the constraints to realize a three-level consistent distributed optimization control strategy. Adopting the above three level control strategy, the output voltage fluctuation of microgrid system is reduced, the robustness of the system is enhanced and the optimal power distribution of the microgrid system is realized. Finally, a simulation model is built to verify the effectiveness of the proposed control strategy in stability and economic operation of the microgrid.