Performance of solar photovoltaic (PV) system degrades considerably when the surface of the PV array is covered with shadows indicated by the reduction in the generated power. Partial shading ...condition causes the PV array to produce multiple peaks in PV’s characteristic curve causing the non-optimal power generation of the conventional maximum power point (MPPT) algorithm. Therefore, we proposed an optimization of PV system through the design of particle swarm optimization (PSO) algorithm in the MPPT in order to enhance the power extraction during shaded conditions. The evaluation of the performance of MPPT were carried out by comparing tracking time, tracking error and efficiency obtained by the PSO along with the two most used algorithms namely perturb and observe (P&O) and incremental conductance (IC). A partial shading generator function was designed to generate shading patterns randomly. The PV system consists of ten PV modules integrated with DC dummy load through DC-DC boost converter was simulated using MATLAB/SIMULINK. Simulation results show that the proposed PSO could obtain the global maximum power point (GMPP) while tracking performance of the P&O and IC MPPT both were stuck on the local maxima. Moreover, the optimization of PSO MPPT gave a promising result that the efficiency of the PV system was improved by around 4.66% on the dynamic shading conditions, while the MPPT’s tracking time is slowed down by 0.0025 s and 0.0105 s when its compared to the P&O and IC MPPT respectively.
This paper describes the design and implementation in real time of a nonlinear control for a wind energy conversion system (WECS). The Backstepping control has been implemented to improve the ...performance of the conversion system based on a permanent magnet synchronous generator (PMSG) connected to the grid. Two static back-to-back converters ensure grid connection and are controlled by Pulse Width Modulation (PWM). The proposed control algorithm ensures proper speed control to extract maximum power. First of all, a WECS full review has been discussed. Thereafter, a Backstepping control laws detailed description based on the Lyapunov stability technique has been reported. Consequently, these control thus helping it possible to operate the complete system in the best performances in the static and dynamic regimes. The second part of this article has been devoted to the Backstepping control experimental validation using the dSPACE DS1104 control board and the Matlab-Simulink environment in order to check and validate the system efficiency. The results achieved have been clearly responded to the requirements of robustness and follow-up of references even under fluctuating wind conditions, and confirmed the control effectiveness in both static and dynamic operating modes.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
The problem that occurs at SMKN 2 Sigli is the learning process that has not used learning media in the form of application software, one of which is Matlab Simulink which can later simplify and ...increase the motivation of students in the classroom. This study aims to determine whether the introduction of the Matlab Simulink application can increase the learning motivation of students in class XI at SMKN 2 Sigli and to determine the response of students after the introduction of the Matlab Simulink application in class XI at SMK 2 Sigli. This type of research uses an experimental model with a quantitative approach. The population in this study were all students at SMK N 2 Sigli as many as 751 people. The sample in this study is class XI students, totaling 17 people, sampling using purposive sampling method. This research instrument includes observation and questionnaires. The results of observing the activeness of students using the Matlab Simulink application increased according to the criteria for the percentage of 92.85% (highly motivated). The results of the motivation of students as many as 52.54% who chose very well were included in the moderately motivated category and gave a positive response to the use of the Matlab Simulink application for class XI SMK Negeri 2 Sigli.
•A modified variable step-size P&O MPPT algorithm is proposed for PV systems.•Minimum oscillations by dividing the PV operating region into four sectors.•Proposed method increases system efficiency ...from 92.6% to 95.4%.•Proposed method reduces steady state oscillations by 9.2%.
Conventional maximum power point tracking (MPPT) techniques such as Perturb and Observe (P&O) and Incremental Conductance (IncCond) are used in photovoltaic (PV) systems to extract the Maximum Power (MP). These algorithms cannot track the Maximum Power Point (MPP) under a rapidly changing insolation. This paper introduces a modified efficient variable step P&O (VSPO) algorithm as an attempt to solve the aforementioned problem. The VSPO technique divides the PV-array operation region into four operating sectors. With the help of these four sectors, the step-size is changed according to how the sector far from the MPP. The performance of the conventional and variable step algorithms P&O techniques is compared. Three-phase grid-tie inverter (GTI) is used to connect the system to the utility grid. MATLAB/SIMULINK software is used to study the validity of the modified technique. The results demonstrate that the VSPO algorithm attains the MPP faster than the conventional techniques and at reduced oscillation rate.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
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•Increasing importance of hydrogen in the current and future energy scenario.•A fully-customisable simulation platform for PEM electrolyzer models is designed.•Control, simulation, ...visualisation and comparison of models are archived.•Graphical User Interface to facilitate interactivity between the user and the models.•Interaction of three environments: MATLAB, Simulink and App Designer.
This work presents the development and implementation of a simulation platform based on MATLAB/Simulink devoted to analysing the behaviour of Polymer Electrolyte Membrane (PEM) electrolyzer (PEMEL) models. A graphical user interface (GUI) designed in App Designer is included for controlling the platform and visualising simulation results. Through this GUI, the user is able to study the models hosted on the platform under various operating conditions, compare the results obtained and even modify the characteristic parameters of the models. The main objective of the platform is to facilitate the study of PEMEL for the development of a digital replica of a physical device housed in a smart microgrid. In these systems, PEMEL are integrated with renewable energy sources for the generation of green hydrogen, which is used as an energy carrier to cope with variations in demand in the medium and long term. The proposal overcomes the limitations identified in previous literature such as the absence of a GUI to facilitate model handling, model modification and the comparison and simulation of different models in the same application. The design and implementation of the simulation platform is reported along with a series of simulation cases to prove its feasibility and successful performance.
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GEOZS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPUK, ZAGLJ, ZRSKP
•A hybrid battery–supercapacitor energy storage was proposed for standalone renewable energy systems.•The operation of a passive connected HESS was examined via both theoretical analysis and ...numerical simulation.•An experimental test bench was developed to validate the simulation results.
In this study, a hybrid energy storage system (HESS), which combines battery for long-term energy management and supercapacitor for fast dynamic power regulation, is proposed for remote area renewable energy power supply systems. The operation of a passive connected HESS was examined via both theoretical analysis and numerical simulation using Matlab/Simulink. An electric inductor was further introduced to improve the performance of the HESS. An experimental test bench was developed to validate the simulation results. It was demonstrated that the HESS can stabilize energy provision, not only for the intermittent renewable energy (RE), but also for fluctuating load applications.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Maximum Power Point Tracking (MPPT) methods are used in photovoltaic (PV) systems to continually maximize the PV array output power which generally depends on solar radiation and cell temperature. ...MPPT methods can be roughly classified into two categories: there are conventional methods, like the Perturbation and Observation (P&O) method and the Incremental Conductance (IncCond) method and advanced methods, such as, fuzzy logic (FL) based MPPT method. This paper presents a survey of these methods in order to analyze, simulate, and evaluate a PV power supply system under varying meteorological conditions. Simulation results, obtained using MATLAB/Simulink, show that static and dynamic performances of fuzzy MPPT controller are better than those of conventional techniques based controller.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
In this work, the performance of a 500 W permanent magnet synchronous generator was evaluated in MATLAB /Simulink. The Simulink model consists of a wind turbine, a PMSG, and an AC – DC rectifier. The ...PMSG input parameter were measured and inputted in the Simulink block while the output results were voltages, currents and power respectively. The PMSG was tested at various wind speed. At the rated wind speed of 11m/s, the output power was 443.2 W.
The main purpose of the construction of weirs is to raise the water level and control it in front of the weir. It is important here to know the longitudinal section of the variable flow behind the ...weir in the open channels. 30 experiments were tested in a horizontal laboratory channel with a length of 12 m, a width of 0.5 m, and a depth of 0.45 m. The longitudinal flow section was evaluated follow a step-by-step process under the influence of five different slopes of the channel bottom with five different discharges for each slope. After that, a MATLAB simulation model was built in order to evaluate the longitudinal section of water surface, which is a plot of the water level along the length of the structure. This method is important for the purpose of shortening the time and obtaining more accurate results. The results were compared between the two methods, and there was good agreement between the two methods.
Overall harmonic distortion and losses will grow during an energy conversion process, while power stability will be reduced. Multilevel inverter technologies have recently become very popular as ...low-cost alternatives for a variety of industrial purposes. The design's minimal benefits include reduced component losses, decreased switching and conduction losses, along with enhanced output voltage and current waveforms. Also, a reduction of the harmonic components of the current and output voltage of the inverter are the most important requirements in multilevel inverters. A seven-level inverter design is presented in this paper that is simulated using MATLAB/Simulink. The inverter converts the DC voltage from three photovoltaic (PV) systems into AC voltage at seven levels. During an outage of one of the PV systems, the inverter will make a switching reduction and supply the AC voltage as a five-level inverter. The inverter’s total harmonic distortion (THD) when it performs as a five-level or seven-level inverter is 4.19% or 1.13% respectively. The modulation technique used is phase disposition via four carriers and a single reference signal at the fundamental frequency.
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