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Mitigating mismatch power losses in photovoltaic systems under partial shading: a comparative study of series-parallel and alternative configurations

10.11591/ijape.v14.i3.pp588-599
Raghad Adeeb Othman , Omar Sharaf Al-Deen Yehya Al-Yozbaky , Ali Abbawi Mohammed Alabbawi
Utilizing the photovoltaic effect, photovoltaic (PV) systems are a popular technique for capturing solar energy and turning sunlight into electricity. However, environmental factors, especially shade, significantly impact photovoltaic system efficiency. Shadows cast on PV panels by surrounding structures, trees, accumulated dirt, clouds, and debris can seriously impair their performance. The purpose of this study was to investigate how shade affects photovoltaic systems utilized in residential settings. Series-parallel (SP) topology for PV system have been investigated. Additionally, in this work, a PV system of 5 kW of the residence home has been proposed and multi cases of shading examined. Through the results obtained when partial shading was applied, it was found that the highest efficiency of the system was when partial shading irradiance (Ir = 500 W/m2) was applied to one column (5 modules) as 82.84%, while the worst and least equipped case was when the shading was applied to the corners and random shading at (8 modules), where the efficiency decreased to approximately 39.24% and 40.64% respectively.
Volume: 14
Issue: 3
Page: 588-599
Publish at: 2025-09-01

Knowledge and practices of nurses regarding prevention of hepatitis B and C viral infection: findings from a single center cross-sectional study in Bangladesh

10.11591/ijphs.v14i3.25824
Rahima Parvin , Md. Abdul Jabbar , Hafiza Sultana , Mohammad Meshbahur Rahman , Most Rownak Zahan Rimu , Rafaat Choudhury
The study aimed to evaluate the nurses’ levels of knowledge and practices in preventing hepatitis B and C viral infections in tertiary level hospitals. A cross-sectional study was conducted among 119 nurses in tertiary level hospital by simple random sampling technique. Data were collected by face to-face interview with semi-structured questionnaire and analysis involved the frequency distribution tables, bar diagrams, and proportion (z-tests). The analysis revealed that most of the nurses fell within the 25-34 age groups, and predominantly held a diploma in nursing. Analysis indicated that 95.79% demonstrated good knowledge, whereas 70.59% exposed good practices. Proportion tests revealed significant associations between demographic factors and knowledge/practice levels. Higher educated nurses (poor knowledge, good knowledge: 13.0%, 87.0%; p = 0.021) and those in older age groups (poor practice, good practice: 36.8%, 63.2%; p = 0.002) displayed significantly better knowledge and practices. This study highlights good knowledge among nurses concerning the prevention of hepatitis B and C infections; significant variation exists in the application of preventive practices. Training programs are recommended to bridge the gap between knowledge and practice.
Volume: 14
Issue: 3
Page: 1294-1303
Publish at: 2025-09-01

Fractional order PID controlled hybrid Cuk converter for electric vehicle

10.11591/ijape.v14.i3.pp733-742
Nallamilli P. G. Bhavani , S. Dinakar Raj , K. Sujatha , N. Navaprakash , D. Ezhilarasan
Choosing the right controller with the right approach is one of any power converter's biggest concerns. In order to optimise induction heating, a hybrid Cuk converter with a fractional-order proportional integral derivative (FOPID) controller is built. The findings show an improved time domain responsiveness in the FOPID controlled closed-loop hybrid DC-DC converter (CDHC) system. In order to improve the interface between the resonant inverter and DC source and to step up voltage with less output ripple, Cuk converters are used. The research project is concerned with modelling and simulating a hybrid closed-loop DC converter system. The findings show an improved time domain responsiveness in the FOPID controlled CDHC system. The suggested approach offers advantages such as high-power density and buck boost capability. After being inverted, the Cuk converter's output is applied to a DC load. The time responses of the closed loop proportional integral (PI) and FOPID controlled homogeneous charge compression ignition (HCCI) systems are compared. The hardware is implemented and tested for the CDHC system for electric vehicles. The results indicate that the FOPID controlled CDHC system has enhanced time response and benefits such as high-power density buck boost ability.
Volume: 14
Issue: 3
Page: 733-742
Publish at: 2025-09-01

Sexual health and well-being during antenatal care: addressing global gaps in healthcare provision

10.11591/ijphs.v14i3.25983
Kabiru Abubakar Gulma , Abubakar Isa Musa
This paper highlights the importance of addressing sexual health and well-being in antenatal care, which goes beyond the absence of reproductive disease to include physical, mental, and social aspects. Central to sexual health is the quality of the relationship between expectant parents, which can influence the future well-being of both the parents and their child. Despite this, current antenatal care often fails to address sexual health due to healthcare providers' lack of training and fears of offending patients when discussing intimate issues. The paper suggests that antenatal care might be viewed as an inadequate environment to handle such sensitive mattersβ€”due to time constraints and perceived intrusiveness, it could be an optimal time for discussions, as parents-to-be are particularly attuned to relationship health during pregnancy. The paper also focuses on adolescent mothers as a globally neglected group in terms of sexual health support during pregnancy, despite the significant role they play in ensuring intergenerational well-being. The broader healthcare system, however, continues to treat sexual health and well-being as taboo subjects, leaving a gap in global antenatal services. As research underscores the importance of a strong parental relationship for the socio-emotional development of the child, the paper advocates for integrating sexual health into antenatal care to enhance both parental well-being and child development. However, this area remains underexplored in many parts of the world due to cultural sensitivities and limited healthcare infrastructure.
Volume: 14
Issue: 3
Page: 1357-1366
Publish at: 2025-09-01

Performance comparison of core loss in induction motor using non-oriented electrical steels

10.11591/ijape.v14.i3.pp640-646
Chittimilla Shravan Kumar Reddy , Ezhilarasi Arivukkannu , Kartigeyan Jayaraman
Induction motor (IM) enjoy certain advantages that include simple design, robust construction, reliable operation, low initial cost, easy operation and simple maintenance besides offering reasonable efficiency. Modelling and definition of procedures leading to good estimation of core losses in induction motors from material test data is still a challenge, is considered as problem statement. The major objective of this paper is to estimate the core loss in an induction motor (IM) by analyzing a selection of non-grain oriented electrical steel materials and then identifying for each represented whether it can be used both as stator and rotor core material. As core loss is influenced by factors such as air gap, B-H theory, eddy currents and excess loss coefficients and Steinmetzuhl factor, this study is intended to improve the electromagnetic performance of the motor. Influencing core loss are the amounts of flux density and elasticity of material. This study was accomplished by using three sorts of non oriented electrical steel: DI MAX-M15, DI MAX-M19, and DI MAX-M36. A 5 HP induction motor was the subject for finite element method (FEM) simulations whose results have been verified by empirical relations, which show the merit of using non oriented electrical steel as core material.
Volume: 14
Issue: 3
Page: 640-646
Publish at: 2025-09-01

Depression and cognitive impairment in Malaysian elderly: insights from a nationwide study

10.11591/ijphs.v14i3.25220
Azlina Wati Nikmat , Nor Jannah Nasution Raduan , Nurul Azreen Hashim , Noor Azleen Ahmad Tarmizi , Nor Anita Affandi , Nor Farahdila Hairoman , Muhd Zulfadli Hafiz Ismail , Tengku Mohd Saifuddin Tengku Kamarulbahri
Depression and cognitive impairment are two prevalent mental health conditions among older adults. This study aimed to investigate the factors associated with cognitive impairment among older adults with depression in Malaysia. Data were drawn from the National Health and Morbidity Survey 2018, a nationwide, cross-sectional study using a two-stage stratified cluster sampling. The sample included respondents aged 50 years and above. Cognitive impairment was assessed using the identification and intervention for dementia in the elderly (IDEA) screening tool, while depression was identified using the validated Malay version of the Geriatric Depression Scale (M-GDS-14). Key variables examined included sociodemographic characteristics, physical activity levels, and social support. Bivariate and multiple logistic regression analyses were performed to identify factors significantly associated with cognitive impairment. Results indicated that cognitive impairment was significantly higher among physically inactive individuals (AOR = 2.70, 95% CI: 0.21, 0.65) and those with low to fair social support (AOR = 1.79, 95% CI: 1.12, 2.86). These findings highlight the importance of incorporating physical and social activities into care plans for elderly patients with depression, particularly those with cognitive impairments.
Volume: 14
Issue: 3
Page: 1129-1136
Publish at: 2025-09-01

The application potential of net zero energy building using rooftop photovoltaics case study of apartments in Gorontalo Province

10.11591/ijape.v14.i3.pp743-751
Abdi Gunawan Djafar , Niniek Pratiwi , Yasin Mohamad , Zhiqiang John Zhai
Gorontalo Province is one of the developing regions in Indonesia. The province has been actively building apartments since 2009. The construction increases population density and energy use intensity. Consequently, demand for electricity power rises. Renewable energy such as rooftop photovoltaics has the potential as a power source for the apartments, considering the abundant solar radiation in Gorontalo which is located near the equator line. Three apartments representing three levels of the inhabitant’s income are selected as study case for the application of photovoltaic (PV) on roof to achive net zero energy building. Simulation of PV energy to power the buildings is conducted using photovoltaic geographical information system (PVGIS). By utilizing monthly electrical bill data, it is found that PV on roof is sufficient to cover the building energy demand and achieve net zero energy building (NZEB). However, there is uncertainty of the fluctuation of energy demand due to the tenant’s energy consumption behaviour. The consumption intensity is limited only by the installed power on each apartment unit. PV on roof alone is unable to provide the need if it is employed to power the unit to the maximum extent.
Volume: 14
Issue: 3
Page: 743-751
Publish at: 2025-09-01

Potential as biogas energy and organic fertilizer: a mixture of rice husks and cow dung on full scale anaerobic digestion

10.11591/ijape.v14.i3.pp533-540
Hashfi Hawali Abdul Matin , Syafrudin Syafrudin , Suherman Suherman , Budiyono Budiyono , Iqbal Syaichurrozi
Rice husk is a biomass that can potentially be converted into biogas energy. In this research, a study was carried out regarding the effect of alkaline pretreatment and then a study related to the potential for developing biogas from rice husks in Indonesia and a study related to the potential utilization of biogas by-products in the form of slurry as solid organic fertilizer. So, the main objective is to determine the effect of alkaline pretreatment of rice husks on the potential development of rice husks as raw material for biogas production on a full-scale anaerobic digestion (AD). Research related to the effect of alkaline pretreatment using 3% NaOH by immersion in the substrate for 24 hours was carried out on a lab scale. The variable TS is set at 27%, C/N ratio is 35, uses a 2-liter digester, and measurements are carried out every other day for 60 days. Furthermore, the up-scale was carried out with an AD fixed dome model with a volume of 6 m3. In this study, it was found that pre-treatment with 3% NaOH increased biogas productivity by 1.6 times higher. The potential for rice husk to be converted into biogas energy can reach 3.5 million liters of biogas by 2022. The by-product of biogas in the form of slurry also has the potential to be used as solid organic fertilizer directly. Parameter tests that have been carried out show that the slurry in biogas from rice husks that have gone through a 60-day AD fermentation process complies with the Indonesian National Standard (SNI) 7763:2018 concerning solid organic fertilizers.
Volume: 14
Issue: 3
Page: 533-540
Publish at: 2025-09-01

OFF-grid efficiency evaluation of an inverter dependent on solar PV generator in Iraq

10.11591/ijape.v14.i3.pp761-768
Bilal Abdullah Nasir , Kutaiba Khalaf Khaleel , Mohammed Ahmed Khalaf
The solar photovoltaic (PV) inverter weighted efficiency is more precise and favorable as it mainly deems the inverter output power properties when exposed to disparate solar PV irradiance. The European metrical efficiency (πœ‚πΈπ‘ˆπ‘…π‘‚), presently, is the bulk broadly admissible in inverter efficiency calculation. This is due to, historically, the European countries have been the biggest exporters and spent of solar PV inverters everywhere in the world. The European efficiency (πœ‚πΈπ‘ˆπ‘…π‘‚) is a concluded metric relying on a standardized European irradiance profile. However, the rendition weightings embedded in this metric may not be fully representative or appropriate for photovoltaic inverters deployed in regions characterized by different climatic conditions, particularly in equatorial and subtropical environments. Accordingly, this study aims to validate the proposed assumption and develop a novel metrical efficiency equation for inverters operating in the Iraqi climate, specifically Baghdad city, relying on the IEC 61683:1999 criterion and the inverter load-duration curve. The proposed formula, validated with field data from an SMA-SB-4000-TL inverter, estimated the energy outcome of a 5.0β€―kW off-grid SPV system in Baghdad with a 2% deviation from measured values. These results validate the use of Ξ·_EURO tailored to Baghdad conditions as a reliable alternative to πœ‚πΈπ‘ˆπ‘…π‘‚ or πœ‚π‘€π΄π‘‹. This enhances the accuracy of system energy yield estimation, investment return calculations, and payback period assessment for solar PV systems.
Volume: 14
Issue: 3
Page: 761-768
Publish at: 2025-09-01

Implementation of fuzzy in DQ control of PV based inverter with plug-in electric vehicles

10.11591/ijape.v14.i3.pp666-675
Hanumesh Hanumesh , Arul Ponnusamy , Dhamodharan Selvaraj , Tanuja Koppa Shankaregowda , Venugopal Narasimhachar , Ananda Marilingappa Halasiddappa
In modern power systems, photovoltaic (PV) generation plays a vital role in sustainable energy supply. PV systems generate DC power, which is converted to AC using built-in converters for grid integration. The quality of power injected into the grid is crucial, especially in the presence of plug-in electric vehicles (PEVs) and non-linear loads, which introduce harmonics and dynamic disturbances. To enhance power quality, advanced control strategies are employed. This paper presents a comparative study of direct-quadrature (DQ) control techniques using traditional proportional-integral (PI) controllers and fuzzy logic controllers (FLCs) in a grid-connected PV system. The DQ control method simplifies the regulation of active and reactive power by transforming three-phase signals into a rotating reference frame. While PI controllers are widely used, they often struggle with non-linearities and load variations. FLCs, on the other hand, offer adaptive control without requiring precise mathematical models, making them more effective under dynamic conditions. The system under study includes PV generation, PEVs, and non linear loads. Performance metrics such as total harmonic distortion (THD), voltage stability, and power factor are analyzed. Results show that fuzzy controllers significantly improve power quality and system response.
Volume: 14
Issue: 3
Page: 666-675
Publish at: 2025-09-01

Parallel operation of transformers to optimize a 33 KV loop of power system

10.11591/ijape.v14.i3.pp579-587
Ethmane Isselem Arbih Mahmoud , Ahmed Abbou , Abdel Kader Mahmoud
This research investigates the viability of a perpetually scalable generation system to accommodate the anticipated growth in domestic load demands on the 33 kV loop network over the period from 2025 to 2040. This is achieved by analysis current situation of network through the voltages, loading lines, and transformers, within the permissible loading limits of the system. In this context, it is assumed that the loop is supplied by an ideal infinite power source. A numerical model utilizing the Gauss-Seidel (GS) method is developed and executed within the PSS/E simulator. The current operational state of the network will be simulated, with a focus on analyzing the voltage profile, which is expected to remain within the range of 0.095 to 1.05 per unit (p.u.). Demand forecasts are based on industrial growth projections for the cities interconnected with the 33 kV loop. The simulation results will demonstrate the feasibility of increasing active power transmission while maintaining effective control over reactive power by the year 2040. Furthermore, solutions will be proposed to address the identified critical path issues. To meet the projected demand, these solutions will involve doubling the capacity of the existing transformers. The proposed system will mitigate load imbalances and stabilize voltage fluctuations by effectively managing rapid variations in reactive power demand. As a result, it improves power quality for industrial consumers.
Volume: 14
Issue: 3
Page: 579-587
Publish at: 2025-09-01

Design of a binary weighted multilevel voltage source inverter for renewable energy purposes

10.11591/ijape.v14.i3.pp712-721
Abdulkareem Mokif Obais , Ali Abdulkareem Mukheef
The flexibility and linearity of renewable energy generation techniques motivate the efforts to find high-performance circuitries capable of integrating the generation stations of renewable energy with the utility grid. As a result of its potential for power modules exploited in new generations of semiconductor switching devices, the voltage source inverter (VSI) has become widespread in the applications of renewable energy systems. In this paper, a new configuration of multilevel VSI is introduced. It is constructed of a unidirectional voltage supply having 15-nonzero levels and feeding a single-phase VSI equipped with an extra-freewheeling circuit. The output voltage of this configuration has 31 different voltage levels following a sinusoidal path. The unidirectional voltage supply is built of eight solid-state switching devices and four binary weighted DC voltage sources, which are realized by using appropriate solar panels. The simulation results of the introduced configuration have revealed almost sinusoidal output voltage and current for both inductive and resistive appliances. The number of employed switching devices is largely reduced compared to a conventional multilevel VSI. No harmonic reduction circuit or traditional pulse width modulation technique is employed in the current design. This system is designed and tested on PSpice.
Volume: 14
Issue: 3
Page: 712-721
Publish at: 2025-09-01

Occupational safety of morticians: A case study of mortuary facilities in Cape Coast, Ghana

10.11591/ijphs.v14i3.25445
James Kojo Prah , Ebenezer Aggrey , Andreas A. Kudom , Mohammed Najimudeen Abdulai , Cecil Banson , Benedict Addo-Yeboa , Richard Pinkrah , Kwasi Sobre Nkrumah , Emmanuel Walker , Elizabeth Atulley
Risk assessment is helpful for risk management because it makes significant workplace concerns easier to understand. Because of the numerous risks involved, the death care sector is regarded as one of the riskiest places to work. Nevertheless, not enough research has been done on the safety of mortuary staff in low-resource environments. This study assessed the risks associated with identified hazards in two mortuary facilities at the University of Cape Coast in Ghana. This was a cross-sectional study that used a combination of methods. Thirty-six morticians participated in the study. Respondents scored low on knowledge, high on attitude, and awareness toward occupational health and safety. Only 9 (25.0%) participants knew the correct concentrations of chlorine solution required to disinfect surfaces. Only two of the six chosen volunteers could reconstitute the chlorine solution for disinfection correctly. Risks of chemical inhalation, musculoskeletal injuries, cuts, and traumatic injuries were evaluated as high. A review of incident registers revealed underreporting of injuries. While the study showed significant gaps in the occupational safety of morticians in low-resource environments, it also presents an opportunity for improvement. Regulatory agencies for morticians in Ghana must set out minimum qualifications for this critical category of health workers.
Volume: 14
Issue: 3
Page: 1540-1551
Publish at: 2025-09-01

Effect of DC link capacitor short-circuit on an inverter fed induction motor performance

10.11591/ijape.v14.i3.pp631-639
Cheikh Oudaa , Ethmane Isselem Arbih Mahmoud , Mohamed Amine Khelif , Ahmed Mohamed Yahya , Bendiabdellah Azeddine , Abdel Kader Mahmoud
Induction motors are widely used in industrial power plants because of their durability, reliability and high performance under different operating conditions of the electrical system. It is also important to note that most of these motors are controlled by variable frequency drives. By adjusting the drive parameters, the motor can be managed according to design. The reliability of motor control systems based on variable speed drives is therefore crucial for industrial applications. Unlike induction motors, the power supply components of these electrical machines are delicate and susceptible to faults. To enhance the performance of the control-motor system, it is essential for researchers to understand how faults affect the drive system as a whole. In this context, this paper addresses short-circuit faults in the intermediate circuit capacitor of an induction motor driven by an inverter. The simulation results of these capacitors faults are presented, and their impact on the behavior of the rectifier, the inverter, and the induction motor is analyzed and interpreted.
Volume: 14
Issue: 3
Page: 631-639
Publish at: 2025-09-01

Boost efficiency performance through the enhancement of duty cycle based MPPT algorithm

10.11591/ijape.v14.i3.pp541-550
Ahmed Badawi , I. M. Elzein , Walid Alqaisi , Al Hareth Zyoud
The use of direct power control (DPC) has become popular as an effective control strategy for pulse width modulated (PWM) converters. The incremental conductance algorithm (INC) is utilized to control the duty cycle (D) in tracking the optimal point to increase power efficiency in wind energy conversion systems (WECS). WECS parameters are adjusted to achieve unity power factor, allowing the system to extract maximum power (π‘ƒπ‘šπ‘Žπ‘₯) from WECS. Simulation results show that wind speed has a significant impact on the captured power, with a proportional relationship between wind speed and power. Control strategies are employed to optimize the (D) to reach the desired operating point. A DC-DC boost converter is connected to WECS, where the (D) controls the MOSFET to maintain π‘‰π‘œπ‘’π‘‘ at the optimal level on the DC link. Various wind speed profiles are simulated in this study to evaluate system efficiency, especially under conditions of rapid wind speed fluctuations. The controller based on (D) demonstrates superior tracking performance through the DC link, ensuring that π‘‰π‘œπ‘’π‘‘ remains at an optimal level.
Volume: 14
Issue: 3
Page: 541-550
Publish at: 2025-09-01
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