Abstract
This paper describes the dynamic modelling of a system used for extraction of groundwater for irrigation using an alternative source of energy. The system is designed based on data of an existing project in Lalmonirhat, Bangladesh. The system comprises a 38.4 kWp solar photovoltaic array, inverter, AC motor, and pump set, which can discharge a maximum of 1,930 m3 of water per day. MATLAB simulation is performed with two types of energy storage system: (i) electric energy using a battery bank and (ii) stored water in a large water tank. A large battery bank and a transformer are needed in the former one, which turns out as a costly solution. The latter one requires a boost converter and a large water tank to store around 2,000 m3 of water, which is also a costly solution. A combination of both systems yields an efficient and economical solution. The effectiveness of these three systems is compared with conventional diesel engine system.
Highlights
Bangladesh is an agriculture-based, densely populated developing country and its 35 percent of GDP comes from agriculture sector [1]
65% pumps were used for supplying drinking water and only 35% were used for irrigation purpose. They stated that in Bangladesh small scale solar pumping system is available which ranges from 300 Wp to 1190 Wp and discharge capacity was 2000 to 80,000 L/d. They addressed the main problem that, in Bangladesh, panel cost was the major cost (45%) in solar irrigation system followed by installation (18%), motor (16%), pump (10%), and pipes and fittings (4%)
A solar irrigation pumping system consists of solar Photo Voltaic (PV) array, inverter, motor-pump set, and storage system
Summary
Bangladesh is an agriculture-based, densely populated developing country and its 35 percent of GDP comes from agriculture sector [1]. There are 1.71 million pumps in Bangladesh: 83% diesel operated and 17% electrically operated [3]. Bangladesh has to import billions of liters of diesel to run these pumps. In this situation, solar irrigation pumps may be an alternative for irrigation in the off-grid areas. Bangladesh is blessed with enormous solar resources because of geographical location (Figure 1). It is situated between 20.30∘ and 26.38∘N and 88.04∘ and 92.44∘E, with an average solar radiation of 4.0 to 6.5 kWh/m2/day and in bright sunshine 6.0 to 9.0 KWh/m2/day [4]
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