A model for direct-coupled PV systems with batteries depending on solar radiation, temperature and number of serial connected PV cells

Ayeng’o, Sarah Paul; Axelsen, Hendrik; Haberschusz, David; Sauer, Dirk Uwe

doi:10.1016/j.solener.2019.03.010

Cited by 68 publications

(16 citation statements)

References 35 publications

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“…When the temperature and solar radiation are high in a given location, the energy generation appears predominantly high due to the association between solar radiation and the energy generated from the PV. 70 Due to increased energy generation as a result of high solar radiation, more energy is produced, and operating cost, NPC, and COE are low as evident in the PV/B hybrid energy system shown in Fig. 10 .…”

Section: Economic Assessment Resultsmentioning

confidence: 99%

Renewable energy as a source of electricity for Murzuq health clinic during COVID-19

Beitelmal

Okonkwo

Housni

et al. 2022

MRS Energy & Sustainability

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A great number of populations of the world, primarily in developing countries, are living in rural areas and are commonly isolated from the grid connection. Unstable power supply and increasing energy prices have significant effects on developing countries, especially during this COVID-19 pandemic. Renewable energy sources can provide sustainable and efficient electricity supply. Murzuq is a rural community situated in the southern part of Libya and endowed with renewable energy resources. While there is high electricity consumption during the lockdown, health clinics also experienced higher energy consumption of longer operating hours and an increased number of electrical appliances. This study investigates the techno-economic assessment of three different hybrid energy systems for health clinics in Murzuq. HOMER (Hybrid optimization model for electric renewables) software tool was used to evaluate the feasibility of employing renewable energy, to provide sustainable energy supply to the clinic. The current unsteady energy supply comes from the national grid and the current energy supply is not sufficient for the clinic’s operating hours and requires a sustainable and steady supply. Measured data collected from the health clinic and HOMER software were used to analyze and optimize the change in overall electricity demand for the health clinic before and during the COVID-19 pandemic. The results showed that the photovoltaic/battery hybrid energy system has a lower net present cost, compared to the Photovoltaic/Generator set/ battery hybrid energy system, but higher than the standalone generator set. However, the highest amount of carbon emission associated with the standalone generator set compared to the other two hybrid energy systems disqualifies it from being a suitable contender for the source of electricity for the health clinic. The photovoltaic/battery was deemed to be most economically beneficial in terms of emission reduction and energy price. The outcomes of this investigation will help stakeholders and designers to optimize hybrid energy systems that economically meet the health clinic energy demands, especially during this pandemic. Graphical abstract

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Section: Economic Assessment Resultsmentioning

confidence: 99%

Renewable energy as a source of electricity for Murzuq health clinic during COVID-19

Beitelmal

Okonkwo

Housni

et al. 2022

MRS Energy & Sustainability

View full text Add to dashboard Cite

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“…Properly voltage-matched batteries can serve as a power coupling element and provide the opportunity to avoid maximum power point tracking (MPPT) for PV modules in the directly coupled device. 13 , 14 To build a PV battery device relevant for outdoor large-scale installations, batteries with potentially low cost and high temperature tolerance are required. 1 , 15 Particularly, high tolerance to temperatures up to 70 °C is required because high PV energy production, especially in warm climate zones, is associated with module temperatures in the range of 30–60 °C, reaching a maximum up to 70 °C.…”

Section: Introductionmentioning

confidence: 99%

Toward the Integration of a Silicon/Graphite Anode-Based Lithium-Ion Battery in Photovoltaic Charging Battery Systems

et al. 2022

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Solar photovoltaic (PV) energy generation is highly dependent on weather conditions and only applicable when the sun is shining during the daytime, leading to a mismatch between demand and supply. Merging PVs with battery storage is the straightforward route to counteract the intermittent nature of solar generation. Capacity (or energy density), overall efficiency, and stability at elevated temperatures are among key battery performance metrics for an integrated PV–battery system. The performance of high-capacity silicon (Si)/graphite (Gr) anode and LiNi 0.6 Mn 0.2 Co 0.2 O 2 (NMC622) cathode cells at room temperature, 45, and 60 °C working temperatures for PV modules are explored. The electrochemical performance of both half and full cells are tested using a specially formulated electrolyte, 1 M LiPF 6 in ethylene carbonate: diethyl carbonate, with 5 wt % fluoroethylene carbonate, 2 wt % vinylene carbonate, and 1 wt % (2-cyanoethyl)triethoxysilane. To demonstrate solar charging, perovskite solar cells (PSCs) are coupled to the developed batteries, following the evaluation of each device. An overall efficiency of 8.74% under standard PV test conditions is obtained for the PSC charged lithium-ion battery via the direct-current–direct-current converter, showing the promising applicability of silicon/graphite-based anodes in the PV–battery integrated system.

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“…To optimize the operation and make micro-grid systems sufficient in all conditions, the focus of the research should be on power and energy management [25,26]. Ayeng'o et al presented a PV model for determining the optimal configuration point between PVs and batteries using many parameters that influence the output voltage [27]. Cho et al showed that the proper sizing of the batteries is critical for the better operation of a stand-alone system [28].…”

Section: Introductionmentioning

confidence: 99%

Modelling and Environmental Assessment of a Stand-Alone Micro-Grid System in a Mountain Hut Using Renewables

et al. 2021

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Mountain huts are stand-alone micro-grid systems that are not connected to a power grid. However, they impact the environment by generating electricity and through day-to-day operations. The installed generator needs to be flexible to cover fluctuations in the energy demand. Replacing fossil fuels with renewable energy sources presents a challenge when it comes to balancing electricity generation and consumption. This paper presents an integration-and-optimization process for renewable energy sources in a mountain hut’s electricity generation system combined with a lifecycle assessment. A custom computational model was developed, validated with experimental data and integrated into a TRNSYS model. Five different electricity generation topologies were modelled to find the best configuration that matches the dynamics and meets the cumulative electricity demand. A lifecycle assessment methodology was used to evaluate the environmental impacts of all the topologies for one typical operating year. The carbon footprint could be reduced by 34% in the case of the actually implemented system upgrade, and by up to 47% in the case of 100% renewable electricity generation. An investment cost analysis shows that improving the battery charging strategy has a minor effect on the payback time, but it can significantly reduce the environmental impacts.

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A model for direct-coupled PV systems with batteries depending on solar radiation, temperature and number of serial connected PV cells

Cited by 68 publications

References 35 publications

Renewable energy as a source of electricity for Murzuq health clinic during COVID-19

Renewable energy as a source of electricity for Murzuq health clinic during COVID-19

Toward the Integration of a Silicon/Graphite Anode-Based Lithium-Ion Battery in Photovoltaic Charging Battery Systems

Modelling and Environmental Assessment of a Stand-Alone Micro-Grid System in a Mountain Hut Using Renewables

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