Multi-objective Control Strategy for Islanded Microgrid Based on Soft Actor Critic Algorithm

Abstract

Aiming at the frequency instability and the increase of control cost caused by the uncertainty of the island microgrid, this paper proposes a multi-objective control strategy for the island microgrid based on the Soft Actor Critic (SAC) algorithm. Firstly, considering the influence of the output distribution of micro gas turbines on the control cost, a multi-objective control model that coordinates control cost and frequency stability is constructed. Secondly, in order to cope with the sparse reward task of multi-objective control, this paper takes the frequency deviation and control cost as the state set, takes the unit output as the action set, and designs the corresponding reward function, thus completing the process design of the multi-objective control strategy. Finally, the calculation example shows that the SAC controller can effectively reduce the control cost on the premise of ensuring the frequency regulation requirements of the microgrid, and the comprehensive control effect is far superior to traditional control methods such as PI control and fuzzy control.