Sizing and Control of Isolated PV System for Self Sufficient House

Delivering energy to remote areas is a challenge due to far distances and lack of fuels so it is more economical to build isolated microgrids as self-sufficient system with renewable energy sources. In this paper, isolated DC microgrid is proposed to feed a single house with the required electrical energy and to generate oxyhydrogen gas HHO that used for cooking. The proposed system consists of PV as a main source of energy, hybrid battery-hydrogen storage system, HHO electrolyzer and DC-DC converters. Firstly, sizing of different components is performed to ensure reliable operation of the proposed system. To ensure stable and smooth operation during large variations in irradiance and load power in addition to the challenging stability issues of constant load behavior, a robust sliding mode controller SMC is used to control the bidirectional converter interfacing battery with the system. The performance of the proposed system is validated through MATLAB simulation. The proposed controllers ensure stable DC voltage with low ripple and is robust with respect to large variations in irradiance and load power.