Dynamic modeling and supervisory controller design for a small isolated hybrid system with pumped hydro storage

Abstract

In this research dynamic modeling of a remote hybrid power system and feasibility of a pumped hydro storage system is presented. Existing hybrid system in Ramea, Newfoundland has an electrolyzer, hydrogen storage and generator system. This research proposes a pumped hydro storage as a replacement to the hydrogen system. Detailed MATLAB-Simulink modeling has been done for every component of the Ramea hybrid power system. Incorporation of a pumped hydro system and some lead acid batteries will eliminate the low tum around efficiency of the electrolyzer and hydrogen generator system. The system dynamic model and simulations presented here is fast, accurate and includes dynamic and supervisory ·controllers. The proposed real time supervisory controller algorithm observes the available surplus/lacking power in the system and regulates pump/turbine and charging/discharging of the battery bank to maintain a stable system frequency. This thesis presents dynamic model, supervisory controller design and algorithm, six case studies and detailed simulation results. This thesis also presents different operational modes of diesel engine generator to estimate the fuel consumption, no of switching and system frequency deviation.