Centralization-distributed Control Strategy for Medium and Low Voltage AC/DC Hybrid Distribution Network

With the continuous development of DC power distribution technology, AC-DC hybrid distribution network based on Voltage Source Converter (VSC) becomes the future development trend. In this paper, the centralization-distributed control strategy of medium and low voltage AC/DC hybrid distribution network for new source-charge access is studied. Medium voltage distribution network and low voltage distribution network are optimized to maximize economy and minimize power fluctuation respectively. Considering the differences of network structure, control equipment and control time scale of medium and low voltage distribution network, corresponding optimization control models are built respectively to realize the cooperative control of medium and low voltage AC-DC hybrid distribution network. The effectiveness of the proposed strategy in suppressing voltage fluctuation on low-voltage side and improving the absorption capacity of Photovoltaic (PV) is verified by the medium voltage 27-node medium voltage AC-DC hybrid power distribution system.