A Thyristor Controlled Hybrid Transformer Flexible Loop Closing Device and Its Control Strategy

With the continuous improvement of new energy penetration and the significant improvement of terminal electrification level, the role of distribution network as the basic power energy carrying network has become increasingly prominent. However, the operation mode of “closed-loop design and open-loop operation” exposes the problems of weak new energy consumption capacity and poor power supply reliability of the traditional distribution network. The existing flexible loop closing technology generally has the problems of high cost, large land occupation and poor reliability, which is not suitable for promotion in distribution network. From the perspective of practical technology and easy popularization and application, this paper analyzes and studies a multi-level voltage regulating device with both functionality and economy based on the flexible closed-loop model of medium voltage distribution network, and then studies the flexible closed-loop control strategy of medium voltage distribution network based on the device, and proposes a fast mapping method of power command. Finally, the control strategy is verified by the hardware in the loop simulation platform.