A Study of Medium Voltage Flexible Loop Closing Control Strategy Based on Sen Transformer

• Published in: 2023 IEEE 7th Conference on Energy Internet and Energy System Integration (EI2) pp. 4414 - 4420
• Main Authors: Yuan, Peie, Mu, Xiaobin, Wang, Xiang, Sang, Xiaokui, Yuan, Yalei, Dai, Fengjiao
• Format: Conference Proceeding
• Language: English
• Published: IEEE 15-12-2023
• Subjects: Control systems; Distribution networks; Medium voltage; Medium voltage flexible loop closing; phase-shifting transformer; power flow regulation; Power supplies; Regulation; Transformers; Vectors
• DOI: 10.1109/EI259745.2023.10512553

With the diversification of loads in the power system and the integration of large-scale distributed power sources, the distribution network architecture of "closed-loop design and open-loop operation" can no longer meet users' needs for reliable power supply and flexible operation of the distribution network. The on-load voltage regulation device, as a power flow controller, can achieve flexible interconnection in the distribution network and contribute to balancing power flow, exploiting distributed power sources, and improving power supply reliability. This paper proposes a flexible interconnection technology, based on a Sen transformer, that uses thyristors and multi-winding transformers to construct a hybrid transformer to achieve multi-level fast voltage regulation. And control strategies such as low impact loop closing operation and power flow transfer are studied to ensure that the loop closing device is cost-effective, provides uninterrupted load transfer, and regulates power flow distribution, thus meeting the demand for medium voltage flexible loop closing operation.