A Decentralized Two-stage Voltage Control Strategy for Non-linear Load Connected Hybrid Microgrid

The operational instability due to the stochastic nature of renewable energy sources (RESs) confirms the lower efficiency of the hybrid microgrid (HMG) in the commercial aspect. Accordingly, in view of the non-linearity produced due to the inclusion of nonlinear load, the HMG system requires a revision in the control model to be more specific in its tracking performance and operational stability. In this paper, a new two-stage voltage control framework is proposed to enhance the performance of the HMGs in terms of operational stability and tracking accuracy under the region of variable weather conditions and nonlinear load. The controller is modeled with the combination of a partial feedback linearization control (PFLC) and second-order damping (SOD) control framework. The efficacy of the controller is measured through the change of meteorological factors of the RESs used in the studied HMG. Additionally, a comparative study is studied to cover the augmented performance of the HMG.