رسائل ماجيستير
English
2017
Optimal Robust Controller Design for Voltage Source Inverters in Microgrids
Ibrahim Habiballah, Mohamed Abido, Wasiu Olaoti Sulaimon
كلية الهندسة-جامعة الملك فهد للبترول والمعادن · السعودية
The evolution of the conventional power systems to a smart grid system is of special interest to the global power system community with the influx of renewable energy resources (RES) as one of the drivers. A dimension of the smart grid proposed to address the problem of RES integration is the microgrid. The successful integration of these RES requires effective control of power electronics interface needed for power processing such as voltage source inverters(VSI). Therefore, the objective of this work is to device an optimal robust controller for a VSI that can effectively control a microgrid microsource both in the standalone and grid-connected mode of the microgrid. In this work, an optimal robust H_2 norm controller is proposed. This control strategy is easy to implement, accommodate system uncertainties and external disturbances in the controller design. In the two operating modes, the system is modelled in such a way that H_2 norm of the closed loop transfer function is optimized to ensure the system’s stability and immunity to external perturbations. Also, the control strategy is observer-based to limit the number measured signals needed for feedback action. The proposed controller is verified via simulation and experimentation. The controller performed satisfactorily in terms of output tracking, decoupling capability, robustness and immunity to exogenous disturbances. Aside that, the controller shows better performance compared to reported literature.