A Novel Sliding Mode Based UPQC Controller for Power Quality Improvement in Micro-Grids

This paper presents a novel State Observer Based Sliding Mode controller for UPQC inverters to enhance the power quality in microgrids. In the proposed control scheme, Enhanced extended state observer was applied on a standard sliding mode controller to boost its disturbance rejection capability. The controller was designed to be robust against parameteric and external uncertainties. Further, affordable UPQC-grid integration scheme suggested where the photovoltaeek system could be connected to the network via UPQC inverters. Using the suggested configuration the active and reactive power injection capability was added to UPQC along with its commonly known advantages. Extensive MATLAB Simulink-based theoretical and experimental studies were conducted in different scenarios to verify the efficiency of the proposed method in improving the power quality indices. Using UPQC with the proposed control scheme shows the better performance than the current traditional UPQC controllers in voltage sag reduction and Harmonics minimization. The main feature of the proposed controller included its accuracy and fast tracking response.