Multi-Agent DSO-TSO Active and Reactive Power Flow Coordination with a Two-Level Decentralised ADMM

Interconnection of transmission and distribution systems requires coordination among the operators of these systems. Such interconnections can provide resource efficiency and system security benefits by covering any generation shortfalls. Power flow coordination at the boundary nodes can enhance congestion and voltage management of the operators. Proposed distributed methods for coordination, as an alternative to centralised management, suffer from numerical instabilities or require large amounts of data exchange. To address these, this paper proposes a two-level decentralised Alternating Direction Method of Multipliers (ADMM). To validate its effectiveness and performance, the proposal is tested on an interconnected modified IEEE 118-bus transmission system and IEEE 33-bus distribution test systems.