Impact of Multi-Year Analysis on the Optimal Sizing and Control Strategy of Hybrid Energy Systems

Ameer Al-Khaykan (), Ibrahim H. Al-Kharsan, Mohammed Omar Ali, Ali Jawad Alrubaie, Hassan Falah Fakhruldeen and J. M. Counsell
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Ameer Al-Khaykan: Intelligent Medical Systems Department, Al-Mustaqbal University College, Hillah 51001, Babil, Iraq
Ibrahim H. Al-Kharsan: Computer Technical Engineering Department, College of Technical Engineering, The Islamic University, Najaf 54001, Iraq
Mohammed Omar Ali: Department of Electrical Power Techniques Engineering, Al-Hussain University College, Karbala 56001, Iraq
Ali Jawad Alrubaie: Medical Instrumentation Techniques Engineering Department, Al-Mustaqbal University College, Hillah 51001, Babil, Iraq
Hassan Falah Fakhruldeen: Electrical Engineering Department, College of Engineering, University of Kufa, Kufa 54001, Iraq
J. M. Counsell: Head of Electronics and Electrical Engineering Department, University of Chester, Parkgate Rd., Chester CH1 4BJ, UK

Energies, 2022, vol. 16, issue 1, 1-17

Abstract: Grid-connected hybrid energy systems (HESs) represent a very promising option for addressing the problem of power outages worldwide. The selection of a suitable optimization approach and operational strategy are important aspects of the optimal design and operation of these HESs. This study aimed to find the optimal grid-connected PV/battery system sizes to supply electricity for a residential house in Karbala, Iraq, using two control strategies, load following (LF) and cycle charging (CC). The optimization was performed using HOMER software with and without the multi-year effects. The comparison analysis was carried out by considering the techno-economic and environmental performance of the feasible systems. The simulation results indicate that optimal configuration is achieved by using the CC strategy. Furthermore, the multi-year module affects the optimal results dramatically. Under the CC strategy, the multi-year effects increase the required PV size from 6 kW to 7 kW and the required number of batteries from 18 to 20, leading to an increase in the net present cost from $26,750 to $33,102 and a decrease in CO 2 emissions from 7581 kg/year to 7379 kg/year. The results also show that the optimization results are highly affected by the variations of some critical parameters, such as solar radiation, average load, and battery degradation limits. The achievements indicate the higher effectiveness of the multi-year effects and control strategy on the optimal design of HESs.

Keywords: hybrid; multi-year; optimization; control strategy; HOMER (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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