Collaborative Autonomous Optimization of Interconnected Multi-Energy Systems with Two-Stage Transactive Control Framework

TL;DR

This paper proposes a bi-level, transactive control framework enabling interconnected multi-energy systems to optimize energy sharing autonomously, ensuring cost efficiency, operational safety, and scalability through a convexified, market-based approach.

Contribution

It introduces a novel two-stage optimization framework that combines autonomous local control with collaborative global coordination for multi-energy systems.

Findings

Framework effectively reduces total operational costs.

Ensures transformer overload prevention during collaboration.

Maintains privacy and autonomy of individual systems.

Abstract

Motivated by the benefits of multi-energy integration, this paper establishes a bi-level two-stage framework based on transactive control, in order to achieve optimal energy provision among interconnected multi-energy systems (MESs). At the lower level, each MES autonomously determines the optimal set points of each controllable assets by solving a cost minimization problem, in which rolling horizon optimization is adopted to deal with load and renewable energies' stochastic features. A technique is further implemented for optimization model convexification by relaxing storages' complementarity constraints, and its mathematical proof verifies the exactness of the relaxation. At the upper level, a coordinator is established to minimize total costs of collaborative interconnected MESs while preventing transformer overloading. This collaborative problem is further decomposed and solved iteratively in a two-stage procedure based on market-clearing mechanism. A distinctive feature of the method is that it is compatible with operational time requirement, while retaining scalability, information privacy and operation authority of each MES. Effectiveness of the proposed framework is verified by simulation cases that conduct detailed analysis of the autonomous-collaborative optimization mechanism.