Stand-alone backup power system for electrical appliances with solar PV and grid options

Abstract

<span style="font-size: 9pt; font-family: 'Times New Roman', serif;">For a portable backup power system, there is an essential need to contribute to increasing the energy conversion efficiency between the source and the electrical household appliances to overcome the recent issues of global warming. This paper proposes a Backup power system (BPS) compatible with the capability to match with two primary power sources; Grid-Connected power as an AC and solar-PV as a DC power source. This system composes of a rechargeable battery bank of about 300V, while the voltage matching concept keeps maintaining the battery fully charged as long as the source power is available. Matlab-based simulation has performed to prove the concept of the adopted voltage-matching. A relay switch circuit controlled by the main power source is used to change-over the load/appliances between direct link through bypassing the main power and the storage battery power when both options of main power are unavailable. The result shows the excellent utilization of the traditional BPS losses, the proposed topology can achieve about 99% power efficiency as compared with the traditional one.</span>

Investigation of voltage regulation in grid–connected PV system

“…The generation of electrical energy from fossil fuels, natural gas, nuclear power plant, and coal results in an increase in the amount of carbon dioxide, carbon monoxide, and sulfur dioxide in the environment which leads to a different kind of health problems. Only for that reason the alternative source of energy generally known as a renewable source of energy comes in the power generation sector as a result, in the present scenario the alternative source of energy becomes more attractive rather than the conventional source of energy [1,2]. A common example of alternative sources of energy is solar, wind, geothermal, biomass, etc.…”