Distributed Optimal Active Power Control in Microgrid with Communication Delays

This paper investigates the distributed optimal active power control problem for microgrids with time delays in communication network. First, a novel algorithm is proposed to solve the economic dispatch problem for microgrids in a distributed manner. The effectiveness of the algorithm and the impact of the time-delay on the convergence are analyzed and strictly proved by the frequency analysis method. Based on the distributed economic dispatch solution, an optimal cooperative control scheme is presented to coordinate the operation of microgrids. Each bus in a microgrid contains two function modules, i.e., the distributed economic dispatch module and the cooperative control module. The cooperative control module receives and tracks the active power generation reference provided by the distributed economic dispatch module. The proposed approach can minimize the total cost and maintain the supply-demand balance of the microgrid. Several case studies are carried out to verify the effectiveness of the proposed approach.