Hydro power is not just an inexhaustible and sustainable source of energy but its flexibility and storage capacity provide alternative route in the use of other erratic renewable energy sources such as solar . This paper proposes the idea of a solar pumped hydro-electricity storage system for increasing the power output of a hydro-impoundment system in this case, The Bui Dam by converting it from a peak load power-plant to a base load power plant. This was achieved by assessing the incorporation of the dam with a pumped hydro storage system which runs on photo-voltaic (PV) systems. Electrical energy produced from the photo-voltaic systems drive a DC- pump to transfer water during the day from the lower reservoir to the upper reservoir of the dam which is mostly an artificial lake through a secondary penstock. Water is then released back for electrical generation through the main penstock for energy commitments to be met. Mathematical models were used to model the PV and PHS power plants. The mathematical models of the PV modules took into account the effects of daily changes in global irradiance and the junction temperature. The PHS subsystem were also modelled into a separated unit of a pump/motor and a turbine/generator by taken into account the water pumping co-efficient (m3/kwh) and the turbine generating co-efficient (kwh/m3). Site parameters such as the head (m) and flow rate of the water (m3/s) were accounted for in the modelling. The proposed design is expected to increase the output of hydro-power power plants by allowing them to run at maximum efficiency without wasting too much energy (water). Also, the cost of production of one kwh of energy is expected to relatively reduce. The results of this study will provide the basis for a consistent and reliable grid which can match the demand.
Ampah Dankwah Jeffery: A teaching and research assistant with a BSc in Renewable Energy Engineering, highly organized and efficient with an effective approach to projects. Aspiring to be a practitioner in the area of sustainable energy development. Jeffrey has been involved with numerous research projects for the Energy and Environmental Engineering Department of the University of Energy and Natural Resources and played an integral role for the department in the award of a 500,000GHS grant from the Skilled Development Fund for the establishment of a Center of Excellence for Bioplastic Manufacturing.
Adjei Kwame Akwaa Mensah: A project engineer (solar) at Danish Engineering Limited and co-founder of Energy Masters. Adjei is an advocate of Sustainable Development Goals 6, 7, 9, 11 & 13. He has been leading several climate action campaigns such effective waste management, green buildings, energy efficiency and sustainable urban planning. Over the past few months, he has worked on and commissioned over a total of 3MW Solar PV Systems.