Publications
Performance improvement of the single axis solar tracker
Oct 11, 2024Journal THE FIFTH SCIENTIFIC CONFERENCE FOR ELECTRICAL ENGINEERING TECHNIQUES RESEARCH (EETR2024)
Publisher American Institute of Physics
DOI https://doi.org/10.1063/5.0236550
Issue 1
Volume 3232
Photovoltaic (PV) panels utilize solar radiation to generate clean and cost-effective electrical energy. By employing solar tracking systems, the panels are positioned to face the sun, ensuring maximum efficiency in electricity production. It should be noted that solar tracking systems outperform fixed solar energy systems by operating 30-40% more efficiently. the MATLAB program was used in the simulations. In this study, a single-axis solar tracking system was designed and implemented to work like a dual-axis solar monitoring apparatus. This structure has the ability to change elevation angles at any day or month during the year. An Arduino Uno controller was used in this study to control the LDR sensors and a Dorman 742-600 motor. The study was conducted on December 21, the shortest day of the year. The results showed a 5.45% increase in capacity over the system compared to the traditional single-axis system. The proposed system can work in the case of the traditional uniaxial system when we fix the elevation angle of the solar arc at 0 degrees. It also works to track two axes when we fix the solar arc angle for the month of December, which is 33.16 degrees, as shown in Table 1. The elevation angles at which the system operates from east to west.
Solar Energy with AC Voltage Load Based on Harmonic Reduction MLI
Apr 22, 2024Journal 2024 21st International Multi-Conference on Systems, Signals & Devices (SSD)
Publisher Institute of Electrical and Electronics Engineers Inc.
DOI https://doi.org/10.1109/SSD61670.2024
In order to minimize complexity, cost, and size, the article suggests a novel 31-level symmetric MLI for PV systems with fewer switch counts and voltage stress. MATLAB software is used to analyze and integrate the suggested topology with the PV system. The outcomes of the simulation demonstrate enhanced performance in relation to current topologies under varying irradiance and load situations, with minimal total standing voltage per unit (TSVPU), components count per level (CC/L), cost function (CF), and switch count. In order to lower total harmonic distortion (THD), the suggested architecture additionally uses phase disposition pulse width modulation (PD-PWM), which is contrasted with existing modulation methods. The outcomes show how well the suggested topology performs in terms of lower THD and better power quality.
DC Motor Speed/Torque Estimation and Control Based on Transfer Function Characteristics
Jun 22, 2023Journal 2023 International Conference on Engineering, Science and Advanced Technology (ICESAT)
Publisher Institute of Electrical and Electronics Engineers Inc
DOI DOI: 10.1109/ICESAT58213.2023.10347312
Abstract: Three-phase bridge controlled rectifier is used in this paper to regulate the speed of a separately excited DC motor (SEDCM). A controller based on a neural network-PI controller is built to get the required angles for trig thyristors to control the speed of SEDCM at desired values. The speed of the SEDCM is estimated depending on transfer function characteristics using the direct output voltage/current of the AC/DC converter, which is designed, evaluated and modeled by Matlab\Simulink. The SEDCM drive system is tested under different conditions of speed/torque in steady-state and dynamic situations. The simulation results explain the success of the designed controller system. The speed/torque responses have a fast active response and adequate identity concerning the actual, estimated and required values.
Estimate and Control speed of a DC motor using Different Power Circuits
Mar 12, 2023Journal PRZEGLĄD ELEKTROTECHNICZNY
Publisher PRZEGLĄD ELEKTROTECHNICZNY
DOI doi:10.15199/48.2023.03.48
Issue 3
Volume 99
Abstract: In this work, sensorless control speed/torque of a separately-excited DC motor (SDCM ) utilizing transfer function characteristics is used with two suggested power drive systems. The first system is a PWM DC/DC converter that only operates in a forward motoring mode. The second proposed power system is a three-phase bridge controlled-rectifier to control the speed of a SDCM. The transfer function of a SDCM is built for estimating speed/torque during steady-state and dynamic operation by sensing terminal voltage and armature current as inputs. The speed is estimated to overcome sensor speed problems. Artificial neural network and/or PI controller is trained to get the required magnitude of firing angle or duty cycle to trig thyristors or tranasistor to control the speed of the SDCM at the wanted values. Therefor based on transfer function characteristics, speed and torque are estimated using direct output current and voltage of the converter circuit. The both proposed circuits and controllers are built and modeled in Matlab program. The systems are simulated under different speed and torque conditions in steady state and transient cases. The modeling results explain the efficiency of the designed controller system. The two systems has quick dynamic responding and suitanble coincidence among the refference, estimated and actual values.
Modeling of 81-Level Inverter Based on a Novel Control Technique
Mar 1, 2022Journal PRZEGLĄD ELEKTROTECHNICZNY
Publisher Wydawnictwo SIGMA-NOT
DOI doi:10.15199/48.2022.03.13
Issue 3
Volume 98
Abstract: Multilevel cascaded inverters using the similar DC source values are applied with limited total harmonic distortion (THD). This paper presents multilevel inverter with unequal DC voltage source values and less power switching devices to get different output voltages with different levels. Single-phase four H-bridge inverter cells with DC voltage values of Vdc, 3Vdc, 9Vdc and 27Vdc are adopted and modelled by MATLAB program with resistive and inductive loads. A new control technique, modified absolute sinusoidal PWM (MASPWM), is designed and employed to drive the switching devices of the multilevel inverter to catch output inverter voltage with levels from 3-level to 81-level. That means, it has the ability to get voltage with any required level. Simulation results indicate that the THD magnitudes of the AC current and voltage are changed form 22% and 13.3% to 1.55% and 0.79% for 5-level to 81-level, respectively
Design of new structure of multilevel inverter based on modified absolute sinusoidal pwm technique
Dec 1, 2021Journal International Journal of Power Electronics and Drive Systems
Publisher Institute of Advanced Engineering and Science
DOI 10.11591/ijpeds.v12.i4.pp2314-2321
Issue 4
Volume 12
The advantage of multilevel inverters is to produce high output voltage values with distortion as minimum as possible. To reduce total harmonic distortion (THD) and get an output voltage with different step levels using less power electronics switching devices, 15-level inverter is designed in this paper. Single-phase 11-switches with zero-level (ZL) and none-zero-level (NZL) inverter based on modified absolute sinusoidal pulse width modulation (MASPWM) technique is designed, modelled and built by MATLAB/Simulink. Simulation results explained that, multilevel inverter with NZL gives distortion percent less than that with ZL voltage. The THD of the inverter output voltage and current of ZL are 4% and 1%, while with NZL is 3.6% and 0.84%, respectively. These results explain the effectiveness of the suggested power circuit and MASPWM controller to get the required voltage with low THD. © 2021, Institute of Advanced Engineering and Science. All rights reserved.
Harmonics resonance elimination technique using active static compensation circuit
Oct 1, 2021Journal Bulletin of Electrical Engineering and Informatics
Publisher Institute of Advanced Engineering and Science (IAES)
DOI 10.11591/eei.v10i5.3148
Issue 5
Volume 10
The existence of nonlinear loads produces high distortion and low power factor in the power system that leads to get poor power quality. Resonance problem is occurred due to the power system inductances and the compensation capacitors which increases the harmonic distortion. Therefore, it is necessary to prevent the action of resonance even if conventional or modern methods are built to improve the power system quality. In this paper, active static compensation circuit is proposed and designed to have the features of improving power factor, reducing THD, and eliminating the harmonics resonance effect at the same time with different linear and nonlinear load conditions. These features have been performed based on a modified pulse width modulation technique to drive and control the proposed circuit. The originality designed point of this technique is to have ability to operate the active static compensation circuit as harmonics injector, power factor corrector and resonance eliminator at the same time. Simulation model results illustrate that the proposed circuit is effective for both steady-state and transient operations conditions. The THD of the supply voltage and current at firing angle (α=300) is reduced by 99% and 98.8% respectively. While the power factor is improved to stay around unity. © 2021, Institute of Advanced Engineering and Science. All rights reserved.
Harmonics Resonance Effect Solution in Industrial Systems using Active Static Compensation Circuit
Feb 13, 2019Journal 2nd International Conference on Electrical, Communication, Computer, Power and Control Engineering, ICECCPCE 2019
Publisher Institute of Electrical and Electronics Engineers Inc.
DOI 10.1109/ICECCPCE46549.2019.203765
Most of the industrial loads are linear and nonlinear loads, which generate harmonics and poor power factor. Capacitor banks or passive power filters can be used to correct power factor and eliminate certain harmonics which may cause resonance between the power system inductance and the compensation circuits. It is required to avoid the effect of resonance even when new methods and techniques are used for improving power quality. Active static compensation circuit (ASCC) is designed and used in this paper to improve the system power quality at different load conditions. The proposed ASCC is controlled using adaptation modified pulse width modulation (AMPWM). The MPWM algorithm is built to drive the ASCC in order to eliminate resonance effects, reduce THD in the AC source, and improve power factor simultaneously at different load conditions. Simulation results clarify that the suggested ASCC is effective in improving power quality of the system at both steady-state and dynamic operating conditions. © 2019 IEEE.