L₂-Gain Disturbance Attenuation-Based Decentralized Secondary Frequency Control in Autonomous Microgrids

This paper proposes an L2-gain disturbance attenuation-based decentralized secondary control for frequency regulation and accurate active power sharing in autonomous microgrids. Such as the randomness of distributed generations (DGs) and uncertainty in load behaviors, the proposed decentralized secondary control can effectively suppress a kind of disturbance of the outside world, so that robustness and asymptotical stability of the microgrid can be achieved. Unlike most of the existing works, a systematic approach of secondary control design is introduced based on the L2- gain disturbance attenuation theory by translating the microgrid system to the Port-controlled Kuramoto-Hamiltonian system. Only needing to be implemented using purely local information, the proposed decentralized secondary control can restore the frequency immediately following the disturbance in the microgrid without the need for event-detection and time-dependent protocol. Finally, the stability analysis is provided and the simulation results are presented to verify control performance under rapid load changes and flexibility during plug-and-play operations.