Future-proofing city power grids: FID-based efficient interconnection strategies for major load-centred environments

The flexible interconnection device (FID) offers significant advantages for interconnecting different distribution networks flexibly. This paper focuses on the significant advantages offered by the FID for interconnecting different distribution networks flexibly. It specifically delves into FID-based multi-voltage and multi-substation distribution networks, proposing a preferable scheme applicable to major load-centred cities. Beginning with an analysis of constructed FID-based flexible interconnected distribution network projects, key configurations and features are summarized. Subsequently, typical configurations, electrical parameters, facilities, relevant power functionalities, and application scenarios of multi-voltage multi-substation distribution networks are outlined. Building upon this foundation, a suitable interconnection scheme tailored for current urban use is explored to meet the specific needs of load-centred cities, while incorporating recent advancements in high-power-density IGCT technology. An EMT model of a 10 kV/10 MW IGCT-based four-substation distribution network is developed in PSCAD/EMTDC. Through thorough analysis under different conditions, the operational performance and benefits are evaluated, providing insights into the efficiency and resilience of the proposed FID-based interconnection. Lastly, challenges and prospects are discussed from various perspectives to advance the development of FID-based flexible interconnection solutions. This study aims to contribute to the advancement and implementation of robust interconnection solutions to meet the evolving needs of major load-centred cities.