Washout Filter-Based Decentralized Control Scheme for Economic Operation of Islanded AC/DC Microgrids

Economic operation is a fundamental issue for both islanded AC and DC microgrids. Conventionally, hierarchical control is commonly utilized to realize the economic operation for islanded microgrids. However, a layering of primary, secondary, and tertiary control may cause incoordination among different layers. To simplify the control schemes and realize the economic operation of islanded microgrids, a fully decentralized control scheme based on washout filter is proposed for both islanded AC and DC microgrids in this paper. The proposed control scheme can realize the economic operation and frequency restoration simultaneously for islanded AC microgrids, and can achieve the economic operation and voltage regulation at the same time for islanded DC microgrids without any additional control loops. Simulation results based on the studied islanded AC and DC microgrids are carried out to validate the effectiveness of the proposed control schemes for both is-landed AC and DC microgrids.