Flexible substation and its control for AC and DC hybrid power distribution

AC and DC hybrid power distribution has become the development trend of the distribution network. For enhancing the flexible operation capability of the AC and DC hybrid power distribution system, a flexible substation designed as an interface device is proposed in this paper. It consists of high/low voltage AC and DC ports. Except can achieve the voltage transformation and electrical isolation at the same time, it also can realize the power flow control between the grid side and the load side. The topology and basic operation principle of the flexible substation are analyzed. In addition, in order to ensure the effective and stable operation of the entire flexible substation system, the corresponding control strategy is also designed. Finally, the time-domain simulation studies in the MATLAB/SIMULINK software environment are conducted under different conditions. The results confirm the efficiency of the proposed flexible substation and control strategy.