Resilience Enhancement of Coordinated Transmission and Distribution System via Risk-Based Decentralized Planning Against Typhoons

The occurrence of high-impact low-probability (HILP) natural disasters such as typhoons poses a significant threat to the secure operation of transmission and distribution (T&D) network system. Simultaneously, the rapid advancement in power distribution grid technologies contributes to the efficient interaction between transmission network and distribution network, thereby providing more possibilities for defending against disasters from a cooperative perspective in T&D network system. To explore the resilience enhancement potential of coordinated transmission and distribution system (CTDS) in defense of probabilistic typhoon impact, a risk-based decentralized planning model for CTDS is proposed aiming at mitigating load reduction at the transmission-distribution level considering random typhoon impact. The planning decision incorporates the investment in transmission line hardening, transmission network expansion at transmission level and distribution line hardening, mobile emergency generator (MEG) deployment as well as automatic switch deployment at distribution level. To address the decentralized model with multiple scenarios, a novel integrated solution procedure is proposed which embeds the alternating direction method of multipliers (ADMM) into a bundle-based progressive hedging algorithm (BPHA), thereby enhancing computation efficiency. The effectiveness and superiority of the proposed resilience enhancement method is demonstrated on a T6D3 system and a T118D7 system.