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29,939 Article Results

Digital controller for active power filter based on P-Q theory under non-ideal main voltages

10.11591/ijpeds.v12.i3.pp1556-1565
Moh. Jauhari , Mohammad Nur , Kukuh Widarsono
This paper proposes a control strategy active power filter under non-ideal main voltages. The P-Q Theory is used to generate three-phase active power filter reference currents, but the P-Q Theory has a weakness when implemented under non ideal main voltages. This paper proposes a reference current generation method using modified P-Q Theory under non-ideal main voltages conditions. Before calculating the P-Q Theory, the non-ideal voltage at the source is normalized by using PLL to determine the phase angle which is then carried out by generating an ideal three-phase signal. The proposed method is simulated and implemented in a three-phase active power filter controller. The test results show the improvement in the performance of the P-Q Theory under non ideal main voltages with THD 7.21% to THD 3.29%.
Volume: 12
Issue: 3
Page: 1556-1565
Publish at: 2021-09-01

Simplified cascade multiphase DC-DC buck power converter for low voltage large current applications: part I --- steady-state analysis

10.11591/ijpeds.v12.i3.pp1708-1719
Anand Bannet Ganesen , Nungky Prameswari , Falah Kharisma Nuraziz , Arwindra Rizqiawan , Pekik Argo Dahono
This paper presents a new simplified cascade multiphase DC-DC buck power converter suitable for low voltage and large current applications. Cascade connection enables very low voltage ratio without using very small duty cycles nor transformers. Large current with very low ripple content is achieved by using the multiphase technique. The proposed converter needs smaller number of components compared to conventional cascade multiphase DC-DC buck power converters. This paper also presents useful analysis of the proposed DC-DC buck power converter with a method to optimize the phase and cascade number. Simulation and experimental results are included to verify the basic performance of the proposed DC-DC buck power converter.
Volume: 12
Issue: 3
Page: 1708-1719
Publish at: 2021-09-01

Quality of provider-client interaction in a reproductive health clinic in Isabela, Philippines

10.11591/ijphs.v10i3.20834
Rosalinda S. Guingab , Pedrita N. Medrano
The quality of provider-interaction determines client satisfaction and decision to seek health care. This research aimed to determine the women clients’ perception of their quality of interaction with the health care providers in a government reproductive health clinic in one of the municipalities in northern Philippines. Respondents consisted of 30 pregnant women who had visited the clinic for prenatal health care check-up were interviewed. A structured questionnaire and a semi-structured guided for probing served as the study’s research instruments. Women perceived the health care providers to possess good communication skills, and had displayed behavior that showed a regard for them. However, the providerinteraction was considered to be unilinear, with the provider perceived to have dominated the interface, The women also perceived only a somewhat evident show of sympathy/empathy. Hostile words were heard frequently. Creation of a two-way interaction with respect for their clients must be considered by the health care providers. Policies must also be formulated to improve the quality of provider-client interaction inside reproductive health clinics.
Volume: 10
Issue: 3
Page: 522-528
Publish at: 2021-09-01

EFL university teachers’ perspectives in written corrective feedback and their actual applications

10.11591/ijere.v10i3.21641
Windy Wahju Purnomo , Yazid Basthomi , Johannes Ananto Prayogo
This study aimed to investigate the English as a foreign language (EFL) university teachers’ perspective and their actual applications in providing written corrective feedback to the writing errors made by the EFL university students and their correlation. The study was based on 80 responses of a Google-Form survey distributed to EFL university teachers with various teaching experiences from the most parts of Indonesia. Correlational design was used in this research. Descriptive statistics and Pearson’s correlation tests were used to analyze data. The results indicated that the majority of teachers had perspectives that it is valuable to provide and vary the strategies of written corrective feedback. In addition, the teachers mostly applied both direct and indirect feedback in various strategies and they only sometimes provided corrections in all aspects of errors and reformulation. It was also found out that the Indonesian EFL university teachers’ perspectives in the written corrective on students’ writing errors highly correlated with their actual applications. The results of the study provide both theoretical and pedagogical implications. Theoretically, it enriches the body knowledge of feedback and EFL writing. Pedagogically, EFL teachers are also suggested to improve their knowledge on various feedback techniques and apply it in their classroom teaching and learning process. 
Volume: 10
Issue: 3
Page: 1089-1099
Publish at: 2021-09-01

Generator and grid side converter control for wind energy conversion system

10.11591/ijpeds.v12.i3.pp1832-1844
Asma Tounsi , Hafedh Abid
This paper focuses on the modeling and control of a wind energy conversion chain using a permanent magnet synchronous machine. This system behaves a turbine, a generator, DC/DC and DC/AC power converters. These are connected on both sides to the DC bus, where the inverter is followed by a filter which is connected to the grid. In this paper, we have been used two types of controllers. For the stator side converter, we consider the Takagi-Sugeno approach where the parameters of controller have been computed by the theory of linear matrix inequalities. The stability synthesis has been checked using the Lyapunov theory. According to the grid side converter, the proportional integral controller is exploited to keep a constant voltage on the DC bus and control both types of powers. The simulation results demonstrate the robustness of the approach used.
Volume: 12
Issue: 3
Page: 1832-1844
Publish at: 2021-09-01

Improved 25-level inverter topology with reduced part count for PV grid-tie applications

10.11591/ijpeds.v12.i3.pp1687-1698
Radouane Majdoul , Abelwahed Touati , Abderrahmane Ouchatti , Abderrahim Taouni , Elhassane Abdelmounim
A new bidirectional multilevel inverter topology with a high number of voltage levels with a very reduced number of power components is proposed in this paper. Only TEN power switches and four asymmetric DC voltage sources are used to generate 25 voltage levels in this new topology. The proposed multilevel converter is more suitable for e-mobility and photovoltaic applications where the overall energy source can be composed of a few units/associations of several basic source modules. Several benefits are provided by this new topology: Highly sinusoidal current and voltage waveforms, low Total Harmonic Distortion, very low switching losses, and minimum cost and size of the device. For optimum control of this 25-level voltage inverter, a special Modified Hybrid Modulation technique is performed. The proposed 25-level inverter is compared to various topologies published recently in terms of cost, the number of active power switches, clamped diodes, flying capacitors, DC floating capacitors, and the number of DC voltage sources. This comparison clearly shows that the proposed topology is cost-effective, compact, and very efficient. The effectiveness and the good performance of the proposed multilevel power converter (with and without PWM control) are verified and checked by computational simulations.
Volume: 12
Issue: 3
Page: 1687-1698
Publish at: 2021-09-01

WISE game: wireless interactive software educational game

10.11591/ijeecs.v23.i3.pp1357-1365
Muel Fred L. Ruiz , Rica I. Esclada , Jannica H. Balderama , Anzel Anne I. Aguirre , Ma. Nancy I. Cutin , Raymund M. Lozada
This study presents the development of a wireless, interactive, educational (WISE) game that incorporates the use of smartphones for reviewing lessons that might suit the standards of the Philippine government’s education department. It is easier today to engage students using digital platforms for education using interactive digital games. In this study, the users can play the game by connecting the smartphones to the prototype through wireless local area network. It consists of two types of cards: power cards which contribute excitement to the game, and question cards which contain questions to be answered by the players. The prototype is an integration of the following components: Raspberry Pi 3B, RFID reader and cards, and speakers. A graphical user interface where the players interact with the game was created using scripting languages, such as PHP, and JavaScript. The project was evaluated by different grade school students of Metro Manila, Philippines. The results of users’ evaluation show that the prototype is accessible and effective for use based on functionality and that the project can also serve as a tool for lesson reviews. Future development of WISE game includes its integration and compatibility to different operating systems with larger databases and accessibility.
Volume: 23
Issue: 3
Page: 1357-1365
Publish at: 2021-09-01

Performance evaluation of GaN and Si based driver circuits for a SiC MOSFET power switch

10.11591/ijpeds.v12.i3.pp1293-1303
Martin J. Carra , Hernan Tacc , Jose Lipovetzky
Silicon Carbide (SiC), new power switches (PSW) require new driver circuits which can take advantage of their new capabilities. In this paper a novel Gallium Nitride (GaN) based gate driver is proposed as a solution to control SiC power switches. The proposed driver is implemented and is performance compared with its silicon (Si) counterparts on a hard switching environment. A thorough evaluation of the energy involved in the switching process is presented showing that the GaN based circuit exhibits similar output losses but reduces the control power needed to operate at a specified frequency.
Volume: 12
Issue: 3
Page: 1293-1303
Publish at: 2021-09-01

Modeling and design of an adaptive control for VSC-HVDC system under parameters uncertainties

10.11591/ijpeds.v12.i3.pp1566-1575
Mohamed amine Kazi , Radouane Majdoul , Nadia Machkour
The growing demand for electricity and the increasing integration of clean energies into the electrical grids requires the multiplication and reinforcement of high-voltage direct current (HVDC) projects throughout the world and demonstrates the interest in this electricity transmission technology. The transmitting system of the voltage source converter-high-voltage direct current (VSC-HVDC) consists primarily of two converter stations that are connected by a dc cable. In this paper, a nonlinear control based on the backstepping approach is proposed to improve the dynamic performance of a VSC-HVDC transmission system, these transport systems are characterized by different complexities such as parametric uncertainties, coupled state variables, neglected dynamics, presents a very interesting research topic. Our contribution through adaptive control based on the backstepping approach allows regulating the direct current (DC) bus voltage and the active and reactive powers of the converter stations. Finally, the validity of the proposed control has been verified under various operating conditions by simulation in the MATLAB/Simulink environment.
Volume: 12
Issue: 3
Page: 1566-1575
Publish at: 2021-09-01

Analysis of the recovery determinant factors of COVID-19 sufferes

10.11591/ijphs.v10i3.20899
Diadjeng Setya Wardani , Arifin Syamsul
The main factor that affects the recovery of people with COVID-19 is immunity. To increase immunity, sufferers of COVID-19 must be able to regulate their bodies and psychological conditions so they don't get stressed because they reduce immunity very quickly. The purpose of this study was to determine the determinants that affect the recovery of COVID-19 sufferers. This research employed a cross-sectional design. The respondent was 30 patients who recovered from COVID-19. The data collection instruments used questionnaires and interview sheets. Data analysis used Fisher's exact test (a=5%) and calculated the prevalence ratio to determine the determinant factors. The results showed that age (p-value 0.034, PR=0.667) and patient education (p-value 0.023, PR=0.600) showed a significant effect, while gender (p-value 0.687, PR=0.78), occupation (p-value 0.253, PR=0.333), income (p-value 0.520, PR=0.895), and patient origin (p-value 0.393, PR=1.118) did not show a significant effect. The determinants that affect the recovery of COVID-19 sufferers are age and education of the sufferer; while gender, occupation, income, and origin do not have a significant effect on the recovery of COVID-19 sufferers.
Volume: 10
Issue: 3
Page: 657-661
Publish at: 2021-09-01

Modeling of high frequency high voltage of waveforms on life of enamel insulation

10.11591/ijeecs.v23.i3.pp1331-1339
S. Narasimha Rao , Elanseralathan Kasinathan
In recent years it has been observed that insulation failure in electrical motors is caused by adjustable speed drives fed by power electronic converters. These converters produce impulse waveforms having a high slew rate generated by the high switching frequency of IGBTs. This paper focuses on high switching frequency stress in low voltage electrical motors for adjustable speeds. To examine the motor winding insulation under such stress twisted-pair samples were developed from enameled wires. A single-coated polyester of enamel with a thickness of 40 microns is used for this work. High-frequencies, high voltages of Square, and Square-rising, Square-spike waveforms of 10-30 kHz are used here. The test results show that the insulation fails earlier for the Square waveform compared to the Square-spike and Square-rising waveforms. In a nutshell, there is an analysis of PD formation in the insulation system at a higher switching frequency is analyzed. Electric field distributions between twisted pairs with various air gaps of the insulation system stressed by the Square and Square-rising waveforms up to 30 kHz are modeled using COMSOL software.
Volume: 23
Issue: 3
Page: 1331-1339
Publish at: 2021-09-01

Image mixed gaussian and impulse noise elimination based on sparse representation model

10.11591/ijeecs.v23.i3.pp1440-1450
Ahmed Abdulqader Hussein , Sabahaldin A. Hussain , Ahmed Hameed Reja
A modified mixed Gaussian plus impulse image denoising algorithm based on weighted encoding with image sparsity and nonlocal self-similarity priors regularization is proposed in this paper. The encoding weights and the priors imposed on the images are incorporated into a variational framework to treat more complex mixed noise distribution. Such noise is characterized by heavy tails caused by impulse noise which needs to be eliminated through proper weighting of encoding residual. The outliers caused by the impulse noise has a significant effect on the encoding weights. Hence a more accurate residual encoding error initialization plays the important role in overall denoising performance, especially at high impulse noise rates. In this paper, outliers free initialization image, and an easier to implement a parameter-free procedure for updating encoding weights have been proposed. Experimental results demonstrate the capability of the proposed strategy to recover images highly corrupted by mixed Gaussian plus impulse noise as compared with the state of art denoising algorithm. The achieved results motivate us to implement the proposed algorithm in practice.
Volume: 23
Issue: 3
Page: 1440-1450
Publish at: 2021-09-01

Active cooling photovoltaic with IoT facility

10.11591/ijpeds.v12.i3.pp1494-1504
Muhammad Nizam Kamarudin , Sahazati Md. Rozali , Mohd Saifuzam Jamri
Harvesting energy from the sun makes the photovoltaic (PV) power generation a promising technology. To obtain a consistent state of charge (SOC), consistent energy must be harvested and efficiently directed to the battery. Overcharging or undercharging phenomena decreases the lifetime of the battery. Besides, the effect of irradiance toward solar in term of sunlight intensity effects the efficiency and hence, sluggish the SOC. The main problem of the solar panel revealed when the temperature has increased, the efficiency of solar panel will also be decreased. This manuscript reports the finding of developing an automatic active cooling system for a solar panel with a real time energy monitoring system with internet-of-things (IoT) facility. The IoT technology assists user to measure the efficiency of the solar panel and SOC of the battery in real time from any locations. The automatic active cooling system is designed to improve the efficiency of the solar panel. The effectiveness of the proposed system is proven via the analysis of the effect of active cooling toward efficiency and SOC of photovoltaic system. The results also tabulate the comparative studies of active-to-passive cooling system, as well as the effect of cooling towards SOC and efficiency of the solar panel.
Volume: 12
Issue: 3
Page: 1494-1504
Publish at: 2021-09-01

Implementation on the dSPACE 1104 of VOC-SVM based anti-windup PI Controller of a three-phase PWM rectifier

10.11591/ijpeds.v12.i3.pp1586-1597
J. lamterkati , L. Ouboubker , M. Khafallah , A. El afia
The study made in this paper concerns the use of the voltage-oriented control (VOC) of three-phase pulse width modulation (PWM) rectifier with constant switching frequency. This control method, called voltage-oriented controlwith space vector modulation (VOC-SVM). The proposed control scheme has been founded on the transformation between stationary (α-β) and and synchronously rotating (d-q) coordinate system, it is based on two cascaded control loops so that a fast inner loop controls the grid current and an external loop DC-link voltage, while the DC-bus voltage is maintained at the desired level and ansured the unity power factor operation. So, the stable state performance and robustness against the load’s disturbance of PWM rectifiers are boths improved. The proposed scheme has been implemented and simulated in MATLAB/Simulink environment. The control system of the VOC-SVM strategy has been built based on dSPACE system with DS1104 controller board. The results obtained show the validity of the model and its control method. Compared with the conventional SPWM method, the VOC-SVM ensures high performance and fast transient response.
Volume: 12
Issue: 3
Page: 1586-1597
Publish at: 2021-09-01

Adaptive backstepping controller design based on neural network for PMSM speed control

10.11591/ijpeds.v12.i3.pp1940-1952
E. Sabouni , B. Merah , I. K. Bousserhane
The aim of this research is the speed tracking of the permanent magnet synchronous motor (PMSM) using an intelligent Neural-Network based adapative backstepping control. First, the model of PMSM in the Park synchronous frame is derived. Then, the PMSM speed regulation is investigated using the classical method utilizing the field oriented control theory. Thereafter, a robust nonlinear controller employing an adaptive backstepping strategy is investigated in order to achieve a good performance tracking objective under motor parameters changing and external load torque application. In the final step, a neural network estimator is integrated with the adaptive controller to estimate the motor parameters values and the load disturbance value for enhancing the effectiveness of the adaptive backstepping controller. The robsutness of the presented control algorithm is demonstrated using simulation tests. The obtained results clearly demonstrate that the presented NN-adaptive control algorithm can provide good trackingperformances for the speed trackingin the presence of motor parameter variation and load application.
Volume: 12
Issue: 3
Page: 1940-1952
Publish at: 2021-09-01
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