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Economic optimization of photovoltaic water pumping systems for irrigation
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.ORCID-id: 0000-0002-1351-9245
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.ORCID-id: 0000-0002-6279-4446
Institute of Water Resources and Hydropower Research, Beijing, China .
Institute of Water Resources and Hydropower Research, Beijing, China .
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2015 (Engelska)Ingår i: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 95, s. 32-41Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Photovoltaic water pumping technology is considered as a sustainable and economical solution to provide water for irrigation, which can halt grassland degradation and promote farmland conservation in China. The appropriate design and operation significantly depend on the available solar irradiation, crop water demand, water resources and the corresponding benefit from the crop sale. In this work, a novel optimization procedure is proposed, which takes into consideration not only the availability of groundwater resources and the effect of water supply on crop yield, but also the investment cost of photovoltaic water pumping system and the revenue from crop sale. A simulation model, which combines the dynamics of photovoltaic water pumping system, groundwater level, water supply, crop water demand and crop yield, is employed during the optimization. To prove the effectiveness of the new optimization approach, it has been applied to an existing photovoltaic water pumping system. Results show that the optimal configuration can guarantee continuous operations and lead to a substantial reduction of photovoltaic array size and consequently of the investment capital cost and the payback period. Sensitivity studies have been conducted to investigate the impacts of the prices of photovoltaic modules and forage on the optimization. Results show that the water resource is a determinant factor.

Ort, förlag, år, upplaga, sidor
2015. Vol. 95, s. 32-41
Nationell ämneskategori
Energiteknik
Identifikatorer
URN: urn:nbn:se:mdh:diva-27650DOI: 10.1016/j.enconman.2015.01.066ISI: 000352169300004Scopus ID: 2-s2.0-84923335713OAI: oai:DiVA.org:mdh-27650DiVA, id: diva2:793084
Tillgänglig från: 2015-03-06 Skapad: 2015-03-06 Senast uppdaterad: 2017-12-04Bibliografiskt granskad
Ingår i avhandling
1. PV water pumping systems for agricultural applications
Öppna denna publikation i ny flik eller fönster >>PV water pumping systems for agricultural applications
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Grassland and farmland degradation is considered as one of the worst environmental and economic threats for China. The degradation process negatively affects food and water security, economy, society and climate changes.

Photovoltaic water pumping (PVWP) technology for irrigation is an innovative and sustainable solution to curb the grassland degradation. At the same time it can promote the conservation of farmland, especially in remote areas of China. The combination of PVWP technology with water saving irrigation techniques and sustainable management of the groundwater resources can lead to several benefits. These include enhancing grassland productivity, halting wind and rainfall erosion, providing higher incomes and better living conditions for farmers.   

This doctoral thesis aims to bridge the current knowledge gaps, optimize system implementation and prevent system failures. This work represents thus a step forward to solve the current and future nexus between energy, water and food security in China, using PVWP technology for irrigation.

Models for the dynamic simulations of PVWP systems, irrigation water requirements (IWR) and crop response to water have been presented and integrated. Field measurements at a pilot PVWP system in Inner Mongolia have been conducted to analyse the reliability of the models adopted. A revision of the traditional design approaches and a new optimization procedure based on a genetic algorithm (GA) have been proposed to guarantee the match between IWR and water supply, to minimize the system failures and to maximize crop productivity and thus the PVWP system profitability and effectiveness.

Several economic analyses have been conducted to establish the most cost effective solution for irrigation and to evaluate the project profitability. The possible benefits generated by the PVWP system implementation have been highlighted, as well as the effects of the most sensitive parameters, such as forage price and incentives. The results show that PVWP system represents the best technical and economic solution to provide water for irrigation in the remote areas compared to other traditional water pumping technologies. The environmental benefits have been also addressed, evaluating the CO2 emissions saving achievable from the PVWP system operation. The assessment of the feasible and optimal areas for implementing PVWP systems in China has been conducted using spatial analysis and an optimization tool for the entire supply chain of forage production. The results show that the potentials of PVWP systems in China are large. Nevertheless, the feasible and optimal locations are extremely sensitive to several environmental and economic para­meters such as forage IWR, groundwater depth, and CO2 credits that need to be carefully taken into account in the planning process.   

Although this doctoral thesis has used China as case study, PVWP technology can be applied for irrigation purposes all over the world both for off- and on-grid applications leading to several economic and environmental benefits.

Ort, förlag, år, upplaga, sidor
Västerås: Mälardalen University, 2015
Serie
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 175
Nationell ämneskategori
Teknik och teknologier Energiteknik
Forskningsämne
energi- och miljöteknik
Identifikatorer
urn:nbn:se:mdh:diva-27641 (URN)978-91-7485-189-2 (ISBN)
Disputation
2015-04-24, Delta, Mälardalens högskola, Västerås, 09:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2015-03-09 Skapad: 2015-03-04 Senast uppdaterad: 2015-04-09Bibliografiskt granskad

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