Chukwuka, C.; Folly, K. A. (Electrical Engineering, University of Cape Town, South Africa)
Renewable Energy has gained a significant attention in recent years due to high energy cost and adverse environmental impacts of conventional fossil fuels. One of the major challenges for the renewable energy systems remains matching the intermittent energy supply with the dynamic power demand. This problem can be solved by grid-tie solar system. However for the stand alone systems certain energy storage devices must be added into the system so as to provide power-on-demand. The energy storage devices which include molten salts, superconducting magnets, supercapacitors and underground thermal energy storage must store energy in excess of electricity supply and subsequently meet demand in shortage of supply.