Robustly coordinated operation of a multi-energy micro-grid in grid-connected and islanded modes under uncertainties

A multi-energy micro-grid (MEMG) consists of combined cooling, heat and power generation units, thermal energy storage systems, diesel generators, and renewable energy generators and it can simultaneously supply electric and thermal loads. The MEMG can operate in grid-connected or islanded mode depending on practical needs. However, uncertainties existing in the renewable power generation and multi-energy loads pose significant challenges to the operation of the MEMGs in terms of economic profits and conformity with operating constraints. To address the uncertainties, this paper proposes a robustly coordinated operation approach which coordinates multiple devices in different timescales to minimize the operating costs. Both the operation modes and the practical operating constraints are considered. In addition, this paper develops a robust optimization method to guarantee optimal and reliable multi-energy supply under the uncertainties. The proposed approach is verified and compared with existing methods, and simulation results show that it can achieve high energy utilization efficiency and high operating robustness against the uncertainties. © 2019 IEEE.