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American Journal of Public Health Research
DOI: 10.12691/ajphr-1-1-3

The Implementation of a Tele-Homecare System with Service Oriented Architecture and HL7 Message Transmission Standard
Ching-Sung Wang

American Journal of Medical and Biological Research
DOI: 10.12691/ajmbr-1-1-2

The Influence of Ethanol on Pyruvate Kinases Activity in Vivo, in Vitro, in Silico
Lelevich Sergey Vladimirovich, Khrustalev Vladislav Victorovich, Barkovsky Eugene Victorovich, Shedogubova Tatyana Aleksandrovna

American Journal of Medical Sciences and Medicine
DOI: 10.12691/ajmsm-1-1-1

Clinical and Histological Features in Wegener Granulomatosis
Li Cavoli Gioacchino, Passantino Rita, Bono Luisa, Tortorici Calogera, Ferrantelli Angelo, Giammarresi Carlo, Rotolo Ugo

American Journal of Infectious Diseases and Microbiology
DOI: 10.12691/ajidm-1-1-2

The Curse of Lymphatic Filariasis: Would the Continual Use of Diethylcarbamazine Eliminate this Scourge in Papua New Guinea?
Anne Lanham, Lillian Mwanri

We have released issues of some journals on February 2013.
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American Journal of Medical Sciences and Medicine
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American Journal of Cancer Prevention
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American Journal of Infectious Diseases and Microbiology
American Journal of Cardiovascular Disease Research
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Dear Label_Name,

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Science and Education Publishing (SciEP) is a multidisciplinary open access publisher of Journals covering the fields of Science, Technology and Medicine. All SciEP publications are subject to high-quality peer review, editorial and production processes and are freely available online.

Welcome to the April, 2013 edition of SciEP newsletter, providing monthly summaries of articles on science & education related topics of interest to scientist and professionals. The mission of our journals is to provide an open access forum for publishing new findings on issues pertinent to scientific and academic field. We also invite you to submit original research papers, review articles, short reports, or case studies are considered for publication in our Multidisciplinary Journals.

American Journal of Public Health Research
DOI: 10.12691/ajphr-1-1-3

The Implementation of a Tele-Homecare System with Service Oriented Architecture and HL7 Message Transmission Standard
Ching-Sung Wang

American Journal of Medical and Biological Research
DOI: 10.12691/ajmbr-1-1-2

The Influence of Ethanol on Pyruvate Kinases Activity in Vivo, in Vitro, in Silico
Lelevich Sergey Vladimirovich, Khrustalev Vladislav Victorovich, Barkovsky Eugene Victorovich, Shedogubova Tatyana Aleksandrovna

American Journal of Medical Sciences and Medicine
DOI: 10.12691/ajmsm-1-1-1

Clinical and Histological Features in Wegener Granulomatosis
Li Cavoli Gioacchino, Passantino Rita, Bono Luisa, Tortorici Calogera, Ferrantelli Angelo, Giammarresi Carlo, Rotolo Ugo

American Journal of Infectious Diseases and Microbiology
DOI: 10.12691/ajidm-1-1-2

The Curse of Lymphatic Filariasis: Would the Continual Use of Diethylcarbamazine Eliminate this Scourge in Papua New Guinea?
Anne Lanham, Lillian Mwanri

We have released issues of some journals on February 2013.
American Journal of Public Health Research
American Journal of Medical Sciences and Medicine
American Journal of Medical and Biological Research
American Journal of Pharmacological Sciences
American Journal of Clinical Medicine Research
American Journal of Nursing Research
American Journal of Cancer Prevention
American Journal of Medicine Studies
American Journal of Infectious Diseases and Microbiology
American Journal of Cardiovascular Disease Research
American Journal of Biomedical Research
American Journal of Mechanical Engineering
American Journal of Microbiological Research
Journal of Preventive Medicine
American Journal of Food and Nutrition
American Journal of Hypertension Research
American Journal of Sports Science and Medicine
Journal of Cancer Research and Treatment
American Journal of Zoological Research
Journal of Biomedical Engineering and Technology
American Journal of Microbiological Research
Biomedical Science and Engineering

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Modeling and Simulation of A Hydraulic Storage System Powered By A Photovoltaic Generator

Haïdara Savadogo*, Eric Korsaga, Toussaint Tilado Guingane, Dominique Bonkoungou, Zacharie Koalaga

Laboratoire de Matériaux et Environnement (LAME), Université Joseph KI-ZERBO, 03 BP 7021 Ouagadougou, Burkina Faso

Abstract: Due to its arid nature and the availability of a large amount of sunlight in the Sahel, water pumping via solar photovoltaic systems can play a very important role in the agricultural and industrial sectors for rural communities in developing countries. However, this type of system could be directly influenced by the variability of sunshine, which fluctuates from day to day and from season to season. To better understand these difficulties, we propose to carry out a theoretical study to improve the performances of a water pumping system comprising a photovoltaic field, an asynchronous motor connected to a surface centrifugal pump and a water reservoir. The aim is to model and simulate the system using Matlab/Simulink software using a dynamic method. This work highlights the evolution of motor pump performance over time, in relation to the intensity of solar lighting. This dynamic method provides a better understanding of immediate changes in performance. The success of this modeling opens the way to practical applications, particularly in remote regions and rural areas where access to water and the electricity grid is limited, environmentally-friendly energy economy.

Keywords: Photovoltaic generator, Asynchronous motor, hydraulic storage, Modeling, Simulation

Received February 15, 2025; Revised March 16, 2025; Accepted March 23, 2025

Citation: Haïdara Savadogo, Eric Korsaga, Toussaint Tilado Guingane, Dominique Bonkoungou, Zacharie Koalaga, Modeling and Simulation of A Hydraulic Storage System Powered By A Photovoltaic Generator. American Journal of Energy Research, 13 (1). 19-25. January 2025. doi:10.12691/ajer-13-1-3

1. Introduction

In many rural areas of the world, access to a reliable source of water remains a major challenge, holding back economic and social development [1]. So, in remote rural areas of Africa, water collection is still largely carried out manually, a task that requires a great deal of time and effort [2]. The motorization of pumps represents a significant advance, reducing drudgery and freeing up time for other essential activities [3]. Among the various alternatives, photovoltaic solar pumping is economically competitive and a promising solution [4]. The most widely used solar pumping system is the so-called “run-of-solar” system, as it enables photovoltaic energy to be used directly from solar photovoltaic modules, without the need for conversion or storage devices. Several models focusing on sizing and modeling the operation of each component of the photovoltaic pumping system have been created and experimentally tested to evaluate the performance of photovoltaic pumping systems [5,6,7] [8,9,10] [11,12]. S. Meunier [5] presents a study on the design, modeling and experimental validation of a photovoltaic pumping system, intended to supply water to an isolated rural community to meet drinking water needs while harnessing a renewable energy source adapted to the local context. A. I. Imadan [6] and D. Abbes [7] discuss the sizing and design of a solar photovoltaic pumping system and propose a sustainable and economical solution to meet farmers' water needs, taking advantage of the abundance of solar energy in the region. R. Nisha [8] offers a review of photovoltaic-powered water pumping systems using brushless DC motors and examines the advances, technologies and challenges associated with these systems in various application contexts. T. T. Assefa T. F. Adametie [9] evaluates the effectiveness and impact of using the Solar MajiPump, a solar-powered pump, in irrigation and agricultural systems in Ethiopia to promote sustainable agriculture and solve the problems associated with limited access to water for farmers in rural areas. R. B. Silva [12] analyzes the water balance and technical-financial performance of irrigation systems in cassava cultivation to understand how optimized water management can improve yields and profitability of this crop, while preserving water resources.

However, these studies approach a method of examination or problem-solving that focuses on a specific state, without considering progress or changes over time. This static study, while providing some elements, remains insufficient, limiting overall understanding of dynamic functioning and adaptation to variations in climatic and water conditions.

Our research is distinguished by the development of a model that simulates the whole system, the impact of fluctuations in solar radiation on the performance of photovoltaic solar pumping systems in real environments characterized by dynamic variations.

With this in mind, this article studies the integration of a hydraulic storage system connected to a photovoltaic generator. Following the introduction, we present the system modeling in section 2. Section 3 presents and discusses the results obtained. The final section concludes this work.

2. System Modeling

The water pumping system studied consists of a photovoltaic array made up of 35 strings of 8 modules with 215 Wp power in series, a boost converter, a three-phase inverter, a motor pump and a water storage tank. The corresponding block diagram is shown in Figure 1.

2.1. Photovoltaic Array Model

The photovoltaic field can be modeled by the equation (1) [13].

[picture] | (1)

where is the module efficiency, APV the module area (m²) and G the illuminance incident on the module plane (W/m²). In relation (1), is the overall module efficiency, given by equation (2) [13]:

[picture] | (2)

where is the module efficiency under standard conditions, ηpc is the degradation factor and in this study it will be equal to 0.9.

𝑇𝑐𝑒𝑙_𝑟 is the cell temperature (Standard conditions) equal to 25º C. 𝑇𝑐𝑒𝑙𝑙 is the cell temperature, which varies as a function of illuminance and ambient temperature, according to the following linear relationship (3) [13,14,15]. It is given by the relation (3):

[picture] | (3)

where NOCT is the cell's operating temperature. It is defined as the temperature the cell reaches in its open-circuit module, under sunlight at Gβ = 800 W/m², with an ambient temperature of 20°C and a wind speed of 1 m/s. Various NOCT values are used in the literature. In this article, we consider the typical NOCT value to be 45°C.

𝛽𝑡 in the relation (2) is the coefficient of influence of photovoltaic cell temperature on module efficiency. Its value ranges from 0.004/ºC to 0.006/ºC [16]. The parameters for standard conditions (𝑇𝑐𝑒𝑙_𝑟 and ) and the coefficient 𝛽𝑡 are provided by PV module manufacturers. In this work, we chose monocrystalline silicon modules with 𝜂𝑟 efficiencies varying between 10 and 14% [17]. Here 𝜂𝑟 will be set to 14% and the coefficient 𝛽𝑡 will be taken equal to 0.0048/ºC. The Matlab/Simulink environment will be used to represent the photovoltaic field model defined using relationship (1).

2.2. Converter Models

Converters have been studied and several models have been developed by different authors [17,18,19]. Many experts believe that their performance remains the same in general [16,19]. As a result, the boost chopper and inverter are considered to be complex pieces of equipment whose function affects power. In simple terms, it's a question of measuring the efficiency of the transformation carried out from the outset. In our work, they are all represented by their identical ηboost and ηond efficiencies, taken to be egal to 0.90 each.

2.3. Motor Pump Model

The motor-driven pump consists of a three-phase motor driving a centrifugal pump.

2.3.1. Asynchronous Motor Model

The asynchronous motor is represented using the conventional equivalent circuit shown in Figure 2 [20].

Figure 1. Pumping system block diagram

Figure 2. Asynchronous motor equivalent diagram

The input electrical power is then given by the following equation (4):

[picture] | (4)

By replacing I₁ in equation (4), the input electrical power is expressed by the relation (5):

[picture] | (5)

where Zeq is the equivalent complex impedance of the equivalent circuit given by the relation (6):

[picture] | (6)

However, the electromagnetic torque can be calculated using the following expression (7) [21,22]:

[picture] | (7)

It's an expression that involves relationships between the system's voltage, frequency, reactances, and impedance elements.

The mechanical equilibrium between the motor and pump is given by the following mechanical equation (8) [21]:

where Cem is the electromagnetic torque, 𝐶𝑟 the pump resistive torque, Co is the motor viscous friction coefficient, and 𝜔 the rotational speed.

On the other hand, the resistive torque is given by the equation (9) [22]:

[picture] | (9)

where 𝐶𝑟𝑠 is the static resistive torque (very low) and 𝑘 a characteristic coefficient of the pump and ω speed of rotation of the asynchronous motor. Replacing equation (9) in (8) and equating it with equation (7) assuming negligible static resistive torque (Crs = 0), we obtain the following relationship (10):

[picture] | (10)

Solving this second-degree equation gives us the following positive solution (11):

[picture] | (11)

The Matlab/Simulink environment will be used to represent the asynchronous motor model defined using the following positive solution (11).

2.3.2. Pump Model

To model the pump, we'll use pump similarity laws [23,24,25]. The performance of a centrifugal pump (QN, HN, and PN) for a given rotational speed ω_N (rad/s) can be determined with the aid of similarity laws using the following equations (12) to (14):

[picture] | (12)

[picture] | (13)

[picture] | (14)

where water flow Q and QN correspond to velocity ω and velocity ωN ; total head H and HN correspond to velocity ω and velocity ωN ; and mechanical power P and PN correspond to velocity ω and velocity ωN.

2.4. Water Reservoir Model

The reservoir model is used to calculate the potential energy of the water accumulated during the storage phase. The potential energy of the reservoir at altitude Z₁ is given by relationship (15):

[picture] | (15)

where M is the mass of water stored in kg, g is the acceleration ((9.80 m)⁄s² ) and Z₁ (m) is the altitude of the reservoir invert.

The evolution of water volume in the reservoir over time is described by relationship (16):

[picture] | (16)

where Q is the pumping volume flow rate, to is the simulation start time (pump start), t₁ is the simulation end time (pump stop) and Vo is the volume of unusable water. Initially, the variation in the mass of water in the reservoir is obtained by multiplying expression (16) by ρ and obtaining relation (17):

[picture] | (17)

In the second step, the variation of the potential energy in the reservoir is obtained by multiplying expression (17) by gZ₁ and obtaining relation (18):

[picture] | (18)

The Matlab/Simulink environment will be used to represent the water volume and potential energy model defined using relations (16) and (18).

2.5. Modeling in Matlab/Simulink

Figure 3 illustrates four distinct blocks, taking solar irradiation and ambient temperature as inputs, and producing water volume and potential energy as outputs. It highlights the interconnection between these input variables and their transformation into outputs through the various calculation steps. The figure also shows the complete model of the proposed pumping system, implemented in Matlab/Simulink.

Figure 3. Matlab/Simulink model of the photovoltaic pumping

Figure 4 shows the photovoltaic field, with solar irradiance as input and PV field power as output.

Figure 4. Photovoltaic field diagram

Figure 5 shows the calculation diagram for the asynchronous machine, where the input is the power input and the output is the motor shaft speed.

Figure 5. Asynchronous motor flow chart

Figure 6 shows the calculation diagram for the pump, where the input is the pump speed and the output is the water flow rate.

Figure 6. Pump flow chart

Finally, Figure 7 shows the calculation diagram for the water tank, with the water flow rate as input and the water volume and potential energy as output.

Figure 7. Water tank flow chart

3. Simulation

For the simulation, we used measured values of solar irradiation and temperature (January 24, 2019, in Ouagadougou) [16]. The initial volume of the Vo tank was set at 22.6 m³ and the final volume, at 1018 m³ in the case of our study after sizing the reservoir.

The asynchronous motor parameters are given in the table 1.

Table 1. Asynchronous motor parameters

The information collected is used to create specific graphs (field power Ppv, absorbed power Pa, water flow Q, water volume V, and potential energy Ep).

4. Results and Discussion

The simulations carried out produced the figures 8 to 13. Figure 8 shows the sunshine and temperature curves used to test the system's operation. Sunshine increases throughout the day, peaking at 12 p.m. and then decreasing to reach its minimum at 6 p.m.

Figure 9 shows the power supplied by the photovoltaic array and absorbed by the motor-driven pump. We can see that the power supplied by the field and absorbed by the motor-driven pump increases proportionally with sunshine, reaching a maximum at solar noon. Both quantities increase from 6 a.m. to 12 p.m. when they reach their maximum values, and then gradually decrease from 12 p.m. to 6 p.m.

We also note that not all the power supplied by the field is absorbed by the motor pump. Intermediate components, such as DC/DC converters or inverters, have losses. Part of the power generated by the PV array is lost as heat.

Figure 8. Variations in site illumination and temperature

Figure 10 illustrates the increase in water volume and potential energy from their initial values Vo and Ep(0) to their respective final values (1080 m³ and 254 MJ). This result demonstrates that the reservoir's potential energy has increased. According to this figure, the final water volume of the reservoir (Vo1), which is 1018 m³, will be reached at around 4:30 p.m. This means that the motor-driven pump can be switched off, and all the power generated by the photovoltaic field can be used directly to supply consumer loads.

Figure 10. Water volume and potential energy

Figure 11 illustrates the storage of photovoltaic solar energy in the form of potential energy. We see an increase in the volume of water and its energy potential as a function of fluctuations in solar illumination. This figure illustrates the direct dependency between the operation of the pumping system and variations in solar irradiance. The volume of water pumped and the potential energy increase with the intensity of sunlight, reaching a peak during the sunniest hours before slowing down at the end of the day. This reflects the efficiency of a photovoltaic system adapted to variable energy needs.

Figure 11. Water volume and potential energy as a function of solar irradiance (arrows indicate the direction of solar irradiance)

The water flow rate is linked to the motor pump rotation speed (laws of similitude), as shown in Figure 12. Moreover, its value varies with solar irradiance, reaching a maximum at 12 p.m. In this system, the pump depends solely on the photovoltaic generator for its flow rate.

Figure 12. Water Flow Rate

Figure 13 clearly shows that motor pump efficiency varies with solar irradiance. Between 6 a.m. and 12 p.m., the motor pump's efficiency increases significantly. This corresponds to a gradual increase in solar irradiance, which supplies more energy to the system, improving its efficiency. Efficiency peaks (at around 65%) between 12 noon and 2 p.m., corresponding to the peak of sunlight on a typical day. During this period, the pump operates at its optimum level, thanks to abundant photovoltaic power and stable operation. After 2 p.m., output gradually decreases until 6 p.m.. This is due to the reduction in solar irradiance, which limits the power available to the motor pump and reduces its efficiency. The curve has a bell shape, typical of photovoltaic systems coupled to electrical equipment, where efficiency depends directly on light intensity.

At the extremes of the day (6 a.m. and 6 p.m.), efficiency is very low, due to insufficient power to operate the motor pump efficiently.

So, the efficiency of the motor-driven pump is strongly linked to solar irradiance, increasing with the power supplied by the photo voltaic panels and peaking during hours of strong sunlight.

Figure 13. Motor Pump Efficiency

5. Conclusion

In this article, we have presented the modeling of a photovoltaic pumping system, constitued by a photovoltaic field, a motor pump and a water tank, in order to facilitate access to the global simulation of the entire system. Analysis of the various results reveals the direct relationship between photovoltaic solar pumping systems and solar lighting. This work highlights the evolution of motor pump efficiency over time, as a function of solar lighting intensity, reaching a value of 65% at 12 pm.

To the best of our knowledge, previous research has generally been limited to average or static values. The used dynamic method provides a better understanding of immediate changes in performance. The success of this modelling opens the way to practical applications, particularly in remote regions and rural areas where access to water and the electricity grid is limited. This approach not only contributes to a more efficient use of renewable resources, but also to the transition towards a sustainable, environmentally-friendly energy economy. Indeed, system improvement (panel sizing, pump selection, loss control) is essential to optimize efficiency and reliability.

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