Excess Energy Management of Hybrid Standalone Renewable Energy Power System
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Date
2021-12-12
Authors
Mai Abd-alatef Mohammed Abdo
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Abstract
Abstract
Palestinian Territories suffer from high shortage of conventional energy and it imports all its needs of petroleum and about 90% of electrical energy needs from Israeli energy companies. The exploitation of the RES in PT for electricity generation is growing up and spread widely. There are a lot of rural areas on PT still suffer from continual interruption of power supply. This makes the implementation of stand-alone systems a feasible option. Better sizing of stand-alone systems increases the feasibility and reduce the simple back period .The excess energy causes technical problems to the systems as well as reduces its feasibility. The base proposed case is a stand-alone (off-grid) hybrid system includes PV, generator(diesel), and battery. The load is for small residential community in Jericho comprises of 10 households. The average load demand is 111 kWh/day. By using HOMER Pro software the optimum design was modeled and achieved. With actual solar radiation, load profile (electrical demand) for the residential proposed load and cost of all equipment.
The base system consists of PV modules, batteries, generator(diesel), load and converter. The net present cost of base proposed system is USD 101,361. The Cost of energy is USD 0.194 /kWh. The contribution of RE is 92.2%. The surplus electricity is 7469 kWh/year about 13.8%.
Different strategies and configurations are proposed to reduce and using the excess electrical energy produced from the base case: with water pumping system, with fuel cell system, with boiler water heating system, and with hybrid boiler water heating and water pumping system. The results showed the best hybrid is(PV/Diesel Generator/BSS with hybrid boiler water heating and Water Pumping System). With Analysis the surplus power and studying the residential load and the water pump and storage tank, a deferrable load is assumed. The results show feasible improvement in the amount of excess power, that the main purpose of this research regardless of NPC & COE, while the NPC & COE that have been studied to economical study just.
The PV/Diesel Generator/BSS with hybrid boiler water heating and Water Pumping System is feasible strategy to electrify the residential load and the most economical system. The COE is USD 0.214/kWh. The NPC of the system is USD $140,220. The capacity of the PV system is 30 kW, 40 batteries of 1150 Ah each and 3 kW diesel generator. The proposed system provides the residential and pumping load and heating load with about no interruption to the power supply. Sensitivity analysis is used to study the impact and affections of variations in other parameters (PV cost, costs of extra equipment, diesel fuel price). Energy management procedure by this configuration to reduce the surplus electricity from 13.8 % to 5.3%.