Cooperative Voltage Control of Interconnection Distribution Networks Based on DC Links

With the development of renewable energy, the voltage quality of the traditional low-voltage distribution network poses a serious challenge. In this paper, a flexible interconnection distribution network is constructed based on multiple Voltage Source Converters (VSCs) and a common DC link. Through power exchange among different feeders, the voltage quality could be improved. However, the communication condition of low-voltage distribution network is weak, which poses a challenge for multiple remote VSCs' control. Therefore, a cooperative voltage control of interconnection distribution networks based on DC Links without communications is proposed in this paper. The DC voltage is used to achieve A C voltage information interaction, and the hosting capacity of the interconnected system could be fully utilized to integrate renewable sources. The unified voltage quality of each feeder is achieved. In addition, the new feeders and its VSC could be directly connected to this system without affecting the operation of the existing VSCs in this control scheme. The feasibility of the proposed strategy is verified in simulation model.