Design of Efficient Off-Grid Solar Photovoltaic Water Pumping System Based on Improved Fractional Open Circuit Voltage MPPT Technique

Abstract

The main application of off-grid solar photovoltaic (SPV) systems is water extraction in rural areas where access to the grid is restricted. In this application, photovoltaic (PV) and pump system regulation are crucial to increase its overall efficiency. In this context, this work presents a simple and efficient off-grid SPV water pumping system (SPVWPS). The designed system is based on a DC-DC boost converter, a three-phase DC-AC inverter, and a three-phase induction motor (IM) coupled to the centrifugal pump. The proposed solution is operated using a control strategy that associates an improved fractional open-circuit voltage (FOCV) method for maximum power point tracking (MPPT) and closed-loop scalar control. This association avoids the use of a speed sensor/encoder and a current sensor for the IM. Finally, the effectiveness of the proposed off-grid SPVWPS and its control system for both steady-state and dynamic conditions of insolation change is verified using a 1KVA rated prototype. The relevance of the drive is also checked in various operating conditions and is found to be adequate for pumping water. Moreover, the proposed method guarantees a fast response, less oscillations around the MPP, a system efficiency of 99%, and a high flow rate due to the extraction of maximum power.

Prediction of the Age and Gender Based on Human Face Images Based on Deep Learning Algorithm

“…Feature selection is then proceeded by the classification process which classifies the face image in terms of age and gender. Age is categorized into 8 classes as (0-2), (4-6), (8)(9)(10)(11)(12), (15)(16)(17)(18)(19)(20), (25)(26)(27)(28)(29)(30)(31)(32), (38)(39)(40)(41)(42)(43), (48)(49)(50)(51)(52)(53), and (60-100), and gender is categorized as male/female. Figure 7 shows the result of classification.…”

“…Backpropagation neural networks are used in [ 28 – 30 ] for gender recognition. Furthermore, CNN has subsequently been found to be effective in obtaining exclusionary features and distinguishing genders [ 31 , 32 ]. SVM, LDA, and AdaBoost are a few of the classification algorithms utilized in visual gender detection.…”

Human Centered Decision-Making for COVID-19 Testing Center Location Selection: Tamil Nadu—A Case Study

“…In the Pacific Asian region, Lee and Lin [28] created a fuzzy quantitative SWOT analysis method for evaluating the competitive environment of international distribution hubs. To cope with quantitative and qualitative parameters in the location selection process, a fuzzy MCDM technique was presented in [29][30][31][32].…”

Investigation on Mechanical Durability Properties of High-Performance Concrete with Nanosilica and Copper Slag

“…The high amount of waste glass powder with nanosilica is made conceivable in concrete [11]. The adverse consequences of sludge inclusion in setting time and mortar strength provisions could be repaid by utilizing nanoparticles [12,13]. The inclusion of nanoparticles could increase the strength of concrete by 15 to 20 percentages [14].…”

“…A couple of exploration was completed to decide concrete's mechanical properties and porousness with nanosilica. Numerous analysts announced extraordinary and incongruous ideal amounts of nanosilica alongside a few strange impacts, which need a lot of fixations in additional exploration [1,[11][12][13][14][15][16][17]. The ideal amount of nanosilica should show up for every material separately.…”