Optimal Decentralized Control of Islanded Microgrids via Cyber Interactions

摘要

Islanded microgrids facilitate energy independence and thus are becoming attractive alternatives for supplementing sustainable power. However, as these systems lack the inertia supplemented by the bulk grid, any perturbations (e.g. change in generation/demand) will result in transient that can destabilize normal operations. In this paper, we propose a novel optimal decentralized control algorithm for serially connected islanded alternating current (AC) microgrids via limited cyber interactions by leveraging on the sparsity of the control gain matrix. This allows intelligent modules in the microgrid to optimally actuate in response to forth-coming changes while maintaining minimal deviations from reference state setpoints. Theoretical analyses and practical simulations conducted on realistic microgrid systems showcase: (1) The decentralized nature of the controllers (2) Effective disturbance rejection during changes in system loads/sources and (3) Scalability in large-scale systems.