Robust Finite-Time Secondary Control Scheme for Islanded Microgrid with Nonlinear Dynamics and Uncertain Disturbances

In this paper, a robust distributed fixed-time secondary restoration schemes for voltage and frequency control is proposed for an islanded microgrid (MG) network. Microgrid network is modeled as a multi-agent system considering the nonlinear system dynamics and uncertain disturbances. The proposed control scheme effectively rejects the uncertain disturbances. Further, here complete nonlinear system dynamics is considered for controller design. Unlike the initial-condition based finite-time control schemes, the proposed control schemes restore the output voltage and frequency of distributed generator unit in finite-time irrespective of the initial states of the distributed generator unit. Further, the proposed controllers are completely distributed and is deployed using a cost-effective sparse information sharing network. The effectiveness of the presented controller is verified by simulating a 5-bus MG network. The results exhibits the effectiveness of proposed controller for voltage and frequency synchronization in finite-time under uncertain disturbances. Further, the controller features he PNP capability and exhibit fast convergence performance in comparison with the conventional neighborhood tracking error controller.