Distributed Event-triggered Strategy for Fixed-time Economic Dispatch in Islanded Microgrids

Abstract

The fixed-time economic dispatch problem is extremely important for microgrids with highly dynamic renewable energy. To reduce unnecessary communication while realizing fixed-time economic dispatch, a distributed event-triggered fixed-time algorithm (abbreviated as disEXAM) is established in the paper. Firstly, based on optimal analysis, the economic dispatch problem can be reformulated by choosing the incremental cost of each generation unit as the consensus variable. Then, a distributed fixed-time economic dispatch algorithm is proposed by employing a fixed-time consensus technique and an event-triggered communication strategy. The algorithm obtains an upper bound for the estimation of the settling time which is irrelevant to the initial status. Finally, simulation results based on the IEEE 14-bus system are presented to illustrate the effectiveness of the distributed optimization algorithm.