Publications
Development and laboratory validation of an LVDC back-to-back system with residential inverter, PV, and battery-based power generation
Apr 4, 2025Journal Energy Conversion and Management: X
Publisher sciencedirect
DOI https://doi.org/10.1016/j.ecmx.2025.100997
This study focuses on a consumer interface unit: a low-voltage (LV) back-to-back (B2B) converter that integrates photovoltaic (PV) generation, battery storage, and possibly other DC loads and, at the same time, decouples grid connection and supply to LV consumers. The present work explores the complexities of regulating the voltage of the DC bus and managing the current. The system employs Maximum Power Point Tracking (MPPT) to optimize solar energy harvesting and utilizes a DC-DC boost converter to amplify the voltage of the PV system. This enhances the dependability, particularly for LV (AC/DC) systems. Battery storage management is accomplished by utilizing a DC-DC buck-boost converter, ensuring a consistent power supply even in the presence of solar irradiation fluctuations. The grid-connected unit and the complete power management system (PMS) were simulated in Simulink. Thorough simulations in Simulink and laboratory validations through a rapid prototyping platform, demonstrate the system’s ability to deliver stable and efficient power in both operational modes. The incorporation of sophisticated control algorithms into the existing power management framework enhances responsiveness to fluctuations in load and solar energy, ensuring peak performance under varying conditions. Additional technical improvements have been made by fine-tuning the DC-link based on the number of IGBT-legs incorporated in the converter setup. This refinement enables more accurate regulation of the voltage levels, reducing switching losses and boosting overall energy efficiency. The system’s modular design facilitates straightforward scalability, allowing for future expansions like the integration of more renewable energy sources or increased storage capabilities. This strategy not only meets the present demands of residential users but also lays the groundwork for future smart grid solutions, promoting a more robust and flexible energy network.
A multi-frequency 4-wire dynamic voltage restorer with harmonic injection capability for use in multi-frequency power transfer systems
Mar 18, 2025Journal Energy Reports
Publisher sciencedirect
DOI https://doi.org/10.1016/j.egyr.2025.03.015
Volume 13
Power quality (PQ) issues such as voltage sag, swell, harmonic distortions, and unbalances pose significant challenges in contemporary electrical distribution networks, particularly with the introduction of multi-frequency power transfer systems (MFPTSs). To tackle these issues, this paper presents an innovative 4-wire, multi-frequency Dynamic Voltage Restorer (DVR) aimed at improving voltage stability and PQ across MFPTSs. Utilizing an advanced multi-Proportional Resonant (PR) control strategy, the DVR compensates for PQ disruptions while also selectively injecting harmonic components across positive, negative, and zero sequences, facilitating smooth multi-channel power transfer. This design converts the DVR into a flexible multi-frequency voltage source capable of injecting specific harmonics (like the 3rd and 5th harmonics) that are crucial for parallel power transfer without congestion. The DVR’s distinctive multi-PR control system streamlines the management of multiple frequencies within a single loop, allowing for accurate harmonic regulation and independent sequence handling. In contrast to conventional PI or single PR controllers that primarily focus on harmonic reduction, this multi-PR DVR proactively injects harmonics, which is an essential capability for MFPTSs. The performance of the DVR system was thoroughly validated through theoretical examination, MATLAB/Simulink simulations, and Hardware-in-the-Loop (HIL) experiments. The outcomes illustrate the DVR’s efficiency in stabilizing voltage and addressing PQ problems in both balanced and unbalanced load scenarios, even within nonlinear conditions. These results highlight the potential of this multi-frequency DVR system to increase resilience, and promote flexible power management in intricate electrical grids, establishing a basis for the evolution of robust, future-proof distribution networks.
Power Flow and Voltage Control Strategies in Hybrid AC/DC Microgrids for EV Charging and Renewable Integration
Feb 14, 2025Journal World Electric Vehicle Journal
Publisher mdpi
DOI https://doi.org/10.3390/wevj16020104
Volume 16
This study outlines the creation and lab verification of a low-voltage direct current (LVDC) back-to-back (B2B) converter intended as a versatile connection point for low-voltage users. The converter configuration features dual inverters that regulate the power distribution to AC loads and grid connections through a shared DC circuit. This arrangement enables the integration of various DC generation sources, such as photovoltaic systems, as well as DC consumers, like electric vehicle chargers, supported by DC/DC converters. Significant advancements include sensorless current estimation for grid-forming inverters, which removes the necessity for conventional current sensors by employing mathematical models and established system parameters. The experimental findings validate the system’s effectiveness in grid-connected and isolated microgrid modes, demonstrating its ability to sustain energy quality and system stability under different conditions. Our results highlight the considerable potential of integrating grid-forming functionalities in inverters to improve microgrid operations.
Comparative experimental evaluation of three-wire SAPF control strategies for power quality improvement
Jan 15, 2025Journal Energy Reports
Publisher sciencedirect
DOI https://doi.org/10.1016/j.egyr.2025.01.020
Volume 13
Filtering plays a vital role in maintaining power quality in three-phase systems, and Shunt Active Power Filters (SAPF) have emerged as the preferred solution in modern applications. In order to compare the performance outcomes of PI, PR, and PI-PR controllers, a laboratory implementation of Direct Current Control (DCC) will be presented in this study. Traditional PI control methods have limitations in eliminating high harmonics in line currents and harmonics at the DC link of an SAPF. In contrast, the PR control method offers significant advantages by nullifying DC link harmonics and providing superior performance and accuracy compared to conventional control and DC link voltage control methods. This improvement is evident in terms of power quality enhancement and cost-effectiveness for SAPF systems since it lowers operating costs, enhances voltage stability, and decreases harmonic distortion. Furthermore, a proposed PR-PI strategy introduces a modernized control structure with an enhanced capability to compensate for low-order harmonics. The suggested control method demonstrates the ability to maintain a low Total Harmonic Distortion (THD) in the injected current, even when abnormal grid conditions arise, in contrast to PI and PR controllers. Additionally, it delivers reduced overshoot and settling time, along with a smaller steady-state error. The effectiveness of these three control methods, DCC-PI, DCC-PR, and DCC-PI-PR, was demonstrated through simulation and experimental results, emphasizing their respective performances in improving power quality.
A Laboratory Investigation of a Multi-Function PR-Controlled DVR
Jan 14, 2025Journal 2024 IEEE 65th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)
Publisher IEEE
DOI 10.1109/RTUCON62997.2024.10830797
Power quality is important in electrical power networks because sags, swells, harmonic distortion, and other interruptions can cause disturbances to electrical equipment and machines. To maintain power system efficiency, these disturbances must be identified and corrected immediately. The Dynamic Voltage Restorer (DVR) is one of the most efficient power distribution system solutions for these phenomena. Harmonics can be managed using separate controllers for each harmonic frequency using a resonant controller, which is more complicated but better for sinusoidal signals than using a PI controller for multi-frequency control. This study designs and models a new structure and control approach for multifunctional DVRs to correct voltage quality and filter out or inject targeted frequencies. In the stationary frame, the suggested control system uses Proportional Resonant (PR) controllers and Sequence-Decouple Resonant (SDR) controllers. The device and method are tested under voltage swell and voltage distortion. Simulation results show that the suggested DVR improves power quality under various operating scenarios, proving the novel approach works. The DVR controller detects voltage fluctuations and controls the converter to inject phase-specific voltages to compensate load voltage through three single-phase transformers.
Laboratory Demonstration of UPQC System
Dec 10, 2024Journal 2024 IEEE 7th International Conference and Workshop Óbuda on Electrical and Power Engineering (CANDO-EPE)
Publisher IEEE
DOI 10.1109/CANDO-EPE65072.2024.10772891
The Unified Power Quality Conditioner (UPQC) is a developed Custom Power Device designed to improve power quality in distribution networks. By addressing both voltage and current-related power quality disturbances, the UPQC plays a vital role in maintaining optimal power conditions. This paper focuses on the implementation and laboratory testing of UPQC control strategies using the Imperix Rapid Control Prototyping system. Distinctive consideration is given to the UPQC's performance in environments with unbalanced and distorted grid conditions, as well as in the existence of non-linear harmonic loads. The proposed control strategy is useful and improves the UPQC's performance in dynamic and steady-state conditions. Laboratory experiments confirm the effectiveness of the control schemes, indicating significant improvements in power quality. Models developed in MATLAB/SIMULINK support the validation of the anticipated control strategy, highlighting its efficacy in practical-world applications.
Comparing ST ATCOM Direct and Indirect Control Algorithms: A Laboratory Investigation
Sep 18, 2024Journal 2024 IEEE 15th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
Publisher IEEE
DOI 10.1109/PEDG61800.2024.10667382
In contrast to the Direct Current Control (DCC) method, which uses converter and load currents to control reactive and harmonic components, the Indirect Current Control (ICC) methodology employed by STATCOMs works differently. The ICC method adjusts the source current to remove the quadrature current component rather than directly measuring the load current and converter current. This method eliminates the need to directly measure the load or converter current by modifying the source current to cancel out the reactive component. The STATCOM can control the non-linear load's reactive and harmonic current needs by drawing the active current component from the source current. Both methods improve power system reliability by compensating loads adequately. Promising results have been obtained from experimental testing that compared DCC and ICC strategies utilizing the Imperix rapid prototyping platform. The study demonstrates the effectiveness of these control strategies in the laboratory environment.
Experimental validation of a Low-Voltage Back-to-Back Converter Control Strategy
Jul 5, 2024Journal 2024 6th Global Power, Energy and Communication Conference (GPECOM)
Publisher IEEE
DOI 10.1109/GPECOM61896.2024.10582599
The study extensively examined a low-voltage back-to-back converter: a three-phase grid-connected converter and a residential inverter connected to its DC side. The paper comprehensively analyzes their control schemes in the dq axes. A PI controller maintains the DC-bus voltage and balances power flow in a closed-loop system. Additionally, a PI-based closed-loop current control has been utilized to regulate the output current of the inverters. The SRF-PLL is employed for grid voltage synchronization. The DC-bus voltage and the inner current controller are designed using the pole-zero elimination approach and frequency response analysis. The proposed technique aims to achieve equilibrium in the grid currents and point-of-common-coupling voltages while regulating the power fed or absorbed from the grid. So, the system ensures balanced Vdc voltage, minimizes oscillation in power exchange, and achieves power control. The performance of the suggested method has been validated by simulations in MATLAB/SIMULINK software. Additionally, various laboratory experiment results are presented.
SMC-PWM of a dynamic performance voltage restorer
Feb 10, 2024Journal 2ND INTERNATIONAL CONFERENCE ON RENEWABLE ENERGY (ICRE2022)
Publisher AIP Conference Proceedings
DOI https://doi.org/10.1063/5.0181558
Issue 1
Volume 2885
Many loads are affected by various power quality issues, including voltage sags/swells, imbalance, harmonics distortion, and short interruption. These loads include a wide variety of susceptible devices to voltage fluctuations. This study developed and implemented a unique feeding device recognized as Dynamic Voltage Restorer (DVR) in an industrial building model. DVRs are frequently used to protect essential loads by reducing the negative impact of voltage variations. The energy-free DVR derives its energy from the transmission line through a rectifier. On the other hand, rectifiers can inject current harmonics and increase HDMs into the system, negatively impacting critical loads. Consequently, the emphasis of this work is on operating a DVR with a unit power factor rectifier topology. Furthermore, the purpose of a Sliding Mode Controller Pulse Width Modulation (SMC-PWM) to record line power and sustain power quality is considered. The simulation results are displayed following the completion of the analysis in MATLAB/Simulink.
Fuzzy based control of optimized efficiency PV array power production
Feb 10, 2024Journal 2ND INTERNATIONAL CONFERENCE ON RENEWABLE ENERGY (ICRE2022)
Publisher AIP Conference Proceedings
DOI https://doi.org/10.1063/5.0182715
Issue 1
Volume 2885
The array of solar panels consists of a group of cells linked together to take advantage of solar energy and convert it into electrical energy. Several factors may affect this matrix’s functioning, leading to a lack of efficiency and cell damage. In this work, a control system is designed and represented over the solar cell array, monitoring it and making appropriate decisions at the right moment in a flexible and mechanical harmony. Also, determining the factors affecting the cell’s functioning individually while, on the matrix directly affects the system’s efficiency, such as the voltage level produced by the cell the voltage level produced by the matrix, and the temperature. Through the extrapolation of these factors, the appropriate treatment is activated to make the value of this factor within the default level, wherefrom the treatments took cooling, changing the angle of inclination, and cleaning of the surface of the solar cell will be stable at a specific. The proposed control system forces the cells to work with consistent data that do not change with changing conditions.
PV-UPQC with MFA-SMC controller to Mitigate Power Quality Problems
Sep 9, 2022Journal 2022 International Conference on Electrical, Computer and Energy Technologies (ICECET)
Publisher IEEE
DOI 10.1109/ICECET55527.2022.9873064
The goal of this study is to provide a detailed description of the design of a Unified Power Quality Conditioner (UPQC) system, which is intended to enhance the power quality of three-phase power distribution grids. UPQC is a device that functions in a manner that is analogous to that of a Unified Power Flow Conditioner in that it makes use of two voltage source converters (VSCs) that are coupled to a capacitor that stores direct current energy and, in some cases, renewable energy sources like solar panels or wind energy. These two variable speed controllers are linked to the grid in the roles of shunt compensator (SC) and series compensator, respectively (SE). A UPFC is utilized in a power transmission system to carry out shunt correction and serial correction concurrently. Although a UPQC in the distribution network is responsible for shunt and serial compensation, these two compensation systems’ underlying operational concepts are distinct now. A UPFC should only offer operational concepts are distinct now. A UPFC should only offer line spends most of its time operating in an environment that is line spends most of its time operating in an environment that is distribution system will often occasionally function with imbalance, distortion, and even DC components when operating. To increase performance, which is necessary to evaluate the functionality using MATLAB/Simulink, the proposed UPQC takes into account all of these aspects while providing shunt or series compensation with the Sliding Mode Controller (SMC) and Moving Average Filter (MFA) method.
Exergy and Energy Analyses of 70 Mw Gas Turbine Power Plant Using Fuzzy Logic Control
Jan 5, 2022Journal 2021 International Conference on Engineering and Emerging Technologies (ICEET)
Publisher IEEE
DOI 10.1109/ICEET53442.2021.9659610
Due to the recent in fuel prices and the increase in energy demand, it is essential to reduce fuel consumption at power stations. To reach this objective, a comprehensive analysis of the energy and oxygen supply of power plants is required. The current research aims to analyze the performance of the 70 MW gas turbine power plant consisting of a turbine, an axial compressor, and an annular combustion chamber using fuzzy techniques. The results demonstrated that the effectiveness of the first and second laws is directly proportional to the load-compression ratio and ambient temperature. Efficiency gains from the first and second acts were 33% and 31%, respectively. In addition, this research shows the effect of three concurrent variables using the fuzzy technique.
Hybrid solar chimneys: A comprehensive review
Dec 17, 2021Journal Energy Reports
Publisher sciencedirect
DOI https://doi.org/10.1016/j.egyr.2021.12.007
Volume 8
The global interest in solar energy as an alternative to traditional fuels has led to a significant overall increase of attentiveness to solar energy systems, especially the solar chimney system. Because one potential drawback of solar chimney systems is the low efficiency of more traditional solar chimneys, researchers and scientists are trying to improve the efficiency of the solar chimney system by integrating them with other conventional or renewable energy systems called hybrid solar chimneys. The current review article examines solar chimney systems combined with other renewable or conventional energy systems. The emphasis of this article was placed on compact solar chimneys with solar panels, solar ponds, and geothermal energy, in addition to a presentation on some solar chimney systems integrated with power stations. These hybrid solar chimneys are described, quantifying the improvement in efficiency, identifying future challenges, and providing insights to researchers on designs that have been introduced in recent years. Suggestions have been submitted to develop the performance of hybrid solar chimneys.
Campus Microgrid-Design and Secure Operation to Prevent Overvoltage
Oct 21, 2021Journal 2021 International Conference on Smart Applications, Communications and Networking (SmartNets)
Publisher IEEE
DOI 10.1109/SmartNets50376.2021.9555420
This document proposes methodologies for the design and operation of a microgrid (MG) for the main campus of the University of New Haven. In this MG, a battery power storage system (BESS), photovoltaic production systems (PV) and controllable loads are included. Intense penetration of the PV may cause overvoltage problems in this MG. A new operational strategy is being considered by coordinating the BESS, PV, and loads to prevent overvoltages and ensure this MG’s safe operation. In this operational strategy, subsidence regulators have been implemented to provide appropriate references to PV and BESS to maintain MG voltage within the safety range. PV output may be reduced to ensure voltage security. The work was audited according to a variable solar irradiation scenario.
Theoretical and experimental study of the effect of concentration ratio on CTPTC performance
Sep 14, 2021Journal NTU Journal of Renewable Energy
Publisher NTU Journal of Renewable Energy
DOI https://doi.org/10.56286/ntujre.v1i1.5
Issue 1
Volume 1
A Theoretical and practical study was conducted to analyze the performance of a closed type parabolic trough collector CTPTC. The study was conducted in northern Iraq at longitude 43o.53 and latitude 35º.25. Use water as a working fluid at a mass flow rate of 0.00083,0.0011 0.00138, 0.00166, Kg/sec, with a concentration ratio of 10, 14 and 22. The maximum value of experimental efficiency of 42% in the summer and 29% in the Winter. The theoretical study was conducted according to ASHRAE 93-1986 (RA-91). The hypothetical results show that theoretical efficiency starts at 30% and increases relatively with increasing mass flow and decreases with temperature and the concentration ratio to reach a maximum value of 50%in the summer and a maximum value of 68% in the Winter.
Neural Network Based Assessment the performance of the triangular in-tegrated collector
Sep 14, 2021Journal NTU Journal of Renewable Energy
Publisher NTU Journal of Renewable Energy
DOI https://doi.org/10.56286/ntujre.v1i1.6
Issue 1
Volume 1
A numerical study was achieved on a new design of storage solar collector by using neural network (NN). The storage collector is a triangular face and a right triangular pyramid for the volumetric shape. It is obtained by cutting a cube from one upper corner at 45o, down to the opposite hypotenuse of the base of the cube. The numerical study was carried out using the computational fluid dynamics code (ANSYS-Fluent) software with natural convection phenomenon in the pyramid enclosure. The results show that, the temperature and velocity distributions throughout the operating period were obtained. The influence of introducing an internal partition inside the triangular storage collector was investigated. Also the optimum geometry and location for this partition were obtained. The enhancement was best at y= 0.25 m whereas the height of triangular collector was 0.5 m. The hourly system performance was evaluated for all test conditions. The performance of the NN to train a model for this work was 0.000207, while the error of the calculation was 1*10^-2 as average.
Design of a Single-Phase Inverter for Solar Energy Conversion System
Sep 14, 2021Journal NTU Journal of Renewable Energy
Publisher NTU Journal of Renewable Energy
DOI https://doi.org/10.56286/ntujre.v1i1.13
Issue 1
Volume 1
Since the calculation of the active and reactive power is considered an essential topic nowadays, the novel method is focused on these calculations with omitting the PLL that will decrease the complexity of the control process. To get the maximum photovoltaic (PV) output, the maximum power point tracker (MPPT) algorithm has been integrated with the proposed method. MATLAB/SIMULINK has been used to show the performance of the proposed method. The simulation outcomes verify the advantage of the novel method by improving the total harmonic distortion (THD) and the system stability regardless of load changes.
Influence of glass cover on the characteristics of PV/trombe wall with BI-fluid cooling
Jul 30, 2021Journal Case Studies in Thermal Engineering
Publisher sciencedirect
DOI https://doi.org/10.1016/j.csite.2021.101273
Volume 27
A practical investigation was conducted to demonstrate the effect of a glass cover on the efficiency of the Photovoltaic/Trombe wall using Nano-fluid (water/Al2O3) as a coolant. Two concentrations of nan-particles (0.5% and 1%) were tested. Using the glass cover on the front of the modified Trombe wall causes an increase in the solar cell temperature, which decreases the system's electrical efficiency but increases the room temperature, leading to improved thermal system efficiency. The highest recorded thermal efficiency value was 80% when using glass cover and 0.5% Nano-fluid at 2 p.m. Moreover, the implementation of a Nano-fluid as a coolant was increased the electrical efficiency. The maximum electrical efficiency was 14% at 1 p.m. In the absence of the glass cover and by using 0.5% Nano-fluid as a coolant. In general, using low concentration Nano-particles with cooling water improves the system efficiency, and increasing the Nano-particles concentration causes a negative influence on the system performance. The maximum total efficiency was 88% at 2 p.m. for the operation conditions (with a glass cover and using 0.5% Nano-fluid at the discharge of 300 L daily).
Power Quality Refinement by Using PV Supported DSTATCOM
Feb 1, 2021Journal Solid State Technology
Publisher Solid State Technology
DOI https://www.solidstatetechnology.us/index.php/JSST/article/view/9516
Issue 2
Volume 64
The dynamic behavior and performance of DSTATCOM and its applications to improve the Microgrid power quality are discussed. To further understand and analyze DSTATCOM, the modeling of the IEEE 13-bus system, PV system, and the proposed DSTATCOM is studied. Validating the proposed DSTATCOM in different scenarios is carried out by using MATLAB/SIMULINK. The simulation results show the difference between the Microgrid voltage with and without DSTATCOM and demonstrate that the DSTATCOM can improve power quality in the Microgrid. It is shown that, by using the DSTATCOM, the power flow in the Microgrid can be managed, the total harmonics distortion can be alleviated, and the voltage profile can be regulated.
A study of voltage regulation in microgrid using a DSTATCOM
Oct 5, 2020Journal Bulletin of Electrical Engineering and Informatics
Publisher Institute of Advanced Engineering and Science (IAES)
DOI https://doi.org/10.11591/eei.v9i5.2442
Issue 5
Volume 9
A well-prepared abstract enables the reader to identify the basic content. This paper presents the solution of voltage fluctuations in urgent situations by providing voltage and reactive support from a distribution static synchronous compensator (DSTATCOM) in the grid. Also, it analyses the influences of DSTATCOM as a voltage controller and compares the system performance with and without DSTATCOM. The DSTATCOM is used in the study to maintain voltage in the microgrid (MG) to be around the rated value after Microgrid disturbance. A successful simulink model of the photovoltaic (PV) system and the proposed DSTATCOM are illustrated to work together as the Microgrid. Microgrids could provide unique resilience and reliability when the environment encountered with less water, higher temperatures, more frequent and harsh wildfires, and severe weather events. The proposed DSTATCOM was installed in different locations in the MG and the best location was chosen to achieve the goal of improved power quality and efficiency. In this paper, two scenarios are discussed with and without DSTATCOM. The simulation results show the difference between the MG with and without DSTATCOM and how the DSTATCOM can amplify power quality in the Microgrid. The proposed DSTATCOM has the capability to improve dampen power oscillations during transit events.
Design and simulation of a microgrid for TIH campus
Aug 2, 2020Journal Indonesian Journal of Electrical Engineering and Computer Science
Publisher Institute of Advanced Engineering and Science (IAES)
DOI DOI: 10.11591/ijeecs.v19.i2.pp729-736
Issue 2
Volume 19
This paper proposes a methodology for designing and operating a microgrid (MG) for the main campus of the Technical Institution Hawija. In this MG, a battery energy storage system (BESS), photovoltaic (PV) generation system, and controllable loads are included. Due to the high penetration of the PVs, over-voltage issues may occur in this MG. A novel operation strategy is considered by coordinating the BESS, PVs, and loads to prevent power outages and accomplish a secure operation of this MG. In this proposed approach, droop controllers have been implemented to provide the appropriate references for the PVs and BESS to maintain the voltage of the MG within a secure range. The generation of the PVs may be curtailed to guarantee the fidelity of the voltage. The intended simulations will be based on MATLAB/Simulink to show the efficacy of the intended design.
Two-level scheduling scheme for integrated 4G-WLAN network
Jun 3, 2020Journal International Journal of Electrical and Computer Engineering (IJECE)
Publisher Institute of Advanced Engineering and Science (IAES)
DOI http://doi.org/10.11591/ijece.v10i3.pp2633-2643
Issue 3
Volume 10
In this paper, a novel scheduling scheme for the Fourth Generation (4G)-Wireless Local Area Network (WLAN) network is proposed to ensure that end to end traffic transaction is provisioned seamlessly. The scheduling scheme is divided into two stages; in stage one, traffic is separated into Actual Time Traffic (ATT) and Non-Actual-Time Traffic (NATT), while in stage two, complex queuing strategy is performed. In stage one, Class-Based Queuing (CBQ) and Deficit Round Robin (DRR) are used for NATT and ATT applications, respectively to separate and forward traffic themselves according to source requirements. Whereas in the stage, two Control Priority Queuing (CPQ) is used to assign each class the appropriate priority level. Evaluation of the performance of the integrated network was done according to several metrics such as end-to-end delay, jitter, packet loss, and network’s throughput. Results demonstrate major improvements for AT services with minor degradation on NAT applications after implementing the new scheduling scheme.
A new method to improve the performance of solar chimneys
Mar 25, 2020Publisher AIP Conference Proceedings
DOI https://doi.org/10.1063/5.0000048
Issue 1
Volume 2213
The system of the solar chimney is one of the most applications used to harness solar energy to generate electricity. The solar chimney system is characterized by low efficiency, which requires exploring ways to enhance systems productivity. Also, System performance has been improved through developing the overall efficiency of these systems using a solar cell. The current study aims to integrate solar chimneys and solar cells in a hybrid system to achieve the desired goal of increasing the production of electric power. A pragmatic model of the Hybrid Solar Chimney framework was worked to examine the warm and electrical execution of the Solar Chimney. The Solar cell was utilized as a retentive dark surface for the base of the Solar Chimney. The study demonstrated that the warm effectiveness of the half breed PV/Solar Chimney framework was moderately high about (91%) in view of the nearness of glass spread, which does not permit the exit of daylight falling on the Solar authority, which prompts a higher temperature around 67 C. Also, the obtained data showed that the total electrical efficiency of the system is about (10.5%). Moreover, the collector inclination angle has an essential effect on the performance of the system, and the 45 ° angle was the best angle of performance for the angle values taken (30 °, 35 °, and 45 °).
Novel Direct Power Control Strategy for Single-Phase Photovoltaic Inverters
Nov 21, 2019Journal 2019 IEEE 16th International Conference on Smart Cities: Improving Quality of Life Using ICT & IoT and AI (HONET-ICT)
Publisher IEEE
DOI 10.1109/HONET.2019.8908068
In the design of inverter controllers, a phase-locked loop (PLL) is usually used to synchronize the inverter output with power grids. However, the adoption of PLL may increase the complexity of the controller. In addition, the accuracy of the PLL can be impacted if the power quality of the power grid is distorted, and the inaccurate PLL output can degrade the performance of the controller. To overcome these issues, a number of non-PLL control strategies have been studied for the single-phase PV inverter. In this work, a novel non-PLL direct power control strategy (DPC) for single-phase H-bridge SVPWM photovoltaic (PV) inverters are proposed. In this strategy, instantaneous real and reactive power are calculated respectively by using voltage and current components with specific frequencies. Then a maximum power point tracker (MPPT) technique is integrated with the strategy to maximize PV generation. Simulation results demonstrate the effectiveness of the proposed strategy. Keywords—Direct power control, photovoltaic generation, phase-locked loop, SVPWM, single-phase H-bridge inverter
Performance analysis of the new design of photovoltaic/storage solar collector
Jul 25, 2019Journal Energy Storage
Publisher wiley
DOI https://doi.org/10.1002/est2.79
Volume 5
This study intends to develop a low cost, dependable, and efficient storage solar collector for household uses. This design is based on integrating solar cell technology and the solar storage collector into one system to achieve three objectives: water storage, electricity generation, and water heating. In this design, a solar cell was fixed on the inclined metal surface of a rectangular storage collector and acted as a black absorber surface. Two experimental models were constructed to study the performance of the new design. In the first design, which referred to as photovoltaic (PV)/storage solar collector, the solar cell was fixed on the inclined metal surface and worked as a black absorber surface in the conventional collector. The second model was the rectangular storage collector, similar to the first model with most attributes. The results showed that the outlet water temperature reaches the maximum value of 42°C at 2 pm for the PV/storage collector at spring day, and the temperature differences between the outlet and inlet temperature are 14.6°C and 30°C at 2 pm for the PV/storage collector and the conventional storage collector, respectively. The overall efficiency increases as a result of removing hot water from the collector to cool the solar cell and increases the electrical energy produced. Generally, under load conditions, the overall efficiency of the PV/storage collector is higher than the second design. In the summer, the highest value for the overall efficiency of the PV/storage collector was 63.02% under load condition, whereas the higher value for the overall efficiency was 40.88% without load condition.
Modeling Solar Modules Performance Under Temperature and Solar Radiation of Western Iraq
Dec 1, 2018Journal International Journal of Power Electronics and Drive System (IJPEDS)
Publisher Institute of Advanced Engineering and Science (IAES)
DOI http://doi.org/10.11591/ijpeds.v9.i4.pp1842-1850
Issue 4
Volume 9
This paper demonstrates a mathematical representation of Photovoltaic (PV) solar cells and hence panels performance. One-diode solar cell model is implemented to simulate the cell and extract the performance indications. The tested PV modules are BP Solar (60 Watt) and Synthesis Power (50 Watts), which are operating in a PV generation system in the University of Anbar - Iraq, College of Applied Sciences. The math model demonstrates Power versus Voltage (P-V) characteristic curves to depict and study various parameters with affecting variations in the PV array performance. The parameters include ambient and cell temperature degrees and solar irradiance (G) level which are the main elements to dictate the productivity of a solar system. G is represented by sun unit (1 sun=1 kW/m2). The outcomes of the simulation model characteristics curves have been compared with curves provided by the tested modules data sheets. MATLAB software has been used to simulate the model and extract the results. This paper also investigated photovoltaic simulation with maximum power point tracking (MPPT) converter to evaluate hence predict the behaviors of the whole photovoltaic DC current generation using PSIM Power Electronics program. The model focuses on the basic components in PV systems; The panel and the DC-DC converter. The modeling outcome data will be used as a reference verifying the performance of the tested modules during the year seasons under the dominating dusty hot weather in western Iraq.
Novel direct power control of single-phase three-level SVPWM inverter for photovoltaic generation
Oct 30, 2017Journal 2017 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT)
Publisher IEEE
DOI 10.1109/ISGT.2017.8085959
In order to get the desired output from photovoltaic (PV) generation, it is necessary to control the power exchange with the grid. Therefore, the calculations of real and reactive power for PV inverters are important. In this study, a novel direct power control (DPC) strategy for three-level single-phase grid-connected SVPWM inverters has been developed. In this strategy, the real and reactive power control and SVPWM are considered in inner loop, while a voltage PI controller is used in outer loop to acquire constant output voltage and provide power reference to the DPC. In addition, the MPPT algorithm is integrated into the control strategy to get the maximum PV output. The performance of the proposed method is verified by simulation results obtained using Matlab/Simulink.