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Journal articles on the topic 'Power quality perturbations'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Obiora, Gerard N., Festus O. Oghenegweke, Godwin O. Igbinosa, Tobenn Obidire, Collins B. Fiemobebefa, and Oluwaseun A. Bamido. "Reduction of Power Quality Perturbations: A Review." European Journal of Applied Science, Engineering and Technology 3, no. 3 (2025): 174–90. https://doi.org/10.59324/ejaset.2025.3(3).11.

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Power is usually generated by various power plants and transmitted at high voltages to the end users. This is made possible through a sophisticated network of diverse components utilized in a given power system. Also, every day, domestic and commercial activities such as cooking, transportation, manufacturing, illumination of offices and homes, air conditioning, refrigeration, and the likes, makes use of electricity. It is thus impossible that the power quality (PQ) will remain the same given that most components utilized across these processes are mostly and highly non-linear in nature. What

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Obiora, Gerard N., Festus O. Oghenegweke, Godwin O. Igbinosa, Tobenn Obidire, Collins B. Fiemobebefa, and Oluwaseun A. Bamido. "Reduction of Power Quality Perturbations: A Review." European Journal of Applied Science, Engineering and Technology 3, no. 3 (2025): 174–90. https://doi.org/10.59324/ejaset.2025.3(3).11.

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Power is usually generated by various power plants and transmitted at high voltages to the end users. This is made possible through a sophisticated network of diverse components utilized in a given power system. Also, every day, domestic and commercial activities such as cooking, transportation, manufacturing, illumination of offices and homes, air conditioning, refrigeration, and the likes, makes use of electricity. It is thus impossible that the power quality (PQ) will remain the same given that most components utilized across these processes are mostly and highly non-linear in nature. What

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3

Chaki, Oana. "Contribution of FACTS to the Electric Energy Quality in Distribution Systems." Problemele Energeticii Regionale 1(30) (April 15, 2016): 39–46. https://doi.org/10.5281/zenodo.1208373.

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Limitation of electromagnetic disturbances occurring in industrial processes and improving power quality are major concerns of professionals in the energy sector. The goal of the work consists in emphasizing the power quality problems incurred due to equipment, which causes disturbances in electricity distribution networks, and highlightes solutions for their effective functioning. The paper presents an application using specialized software to analyze power grids in order to create an overview of solutions for efficient operation of the distribution system in case when a user determines fluct

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Golovanov, Nicolae. "Energy Quality in Microgrids." Problemele Energeticii Regionale 1(30) (April 15, 2016): 31–38. https://doi.org/10.5281/zenodo.1208361.

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Measures for limiting environmental pollution by power plants using fossil fuel sources and for efficient use of local energy sources can cause significant changes in the structure of the electricity distribution networks through the development of micro-grids that can operate practically isolated or connected to the public electricity network, which ensures bilateral exchanges of energy. The microgrid requires a detailed analysis of the level of quality of electricity supplied to the microgrid. The detailed analysis of technical solutions is needed to ensure a necessary level of electric ener

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Pamela S, Jasmin, R. Saranya, V. Indragandhi, et al. "2D Finite Element Analysis of Asynchronous Machine Influenced Under Power Quality Perturbations." Computers, Materials & Continua 70, no. 3 (2022): 5745–63. http://dx.doi.org/10.32604/cmc.2022.020093.

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Alali, Mohamad Alaa Eddin, Yuri B. Shtessel, Jean-Pierre Barbot, and Stefano Di Gennaro. "Sensor Effects in LCL-Type Grid-Connected Shunt Active Filters Control Using Higher-Order Sliding Mode Control Techniques." Sensors 22, no. 19 (2022): 7516. http://dx.doi.org/10.3390/s22197516.

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The effects of measuring devices/sensors on improving the power quality (PQ) of electric networks are studied in this paper. In this context, improving the performance of an LCL-type grid connected to a three-phase three-wire shunt active filter (SAF) in the presence of voltage perturbations is studied. In order to ensure the high-quality performance of LCL-SAF in the presence of voltage perturbations, the robust continuous second-order sliding mode controller (2-SMC), including twisting and super-twisting controllers, and continuous higher-order sliding mode controller (C-HOSMC)-based approac

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Sarojam, Praveen Raj Rajaswamy, and Joseph Sarojini Savier. "Design and verification of q-axis perturbation based active islanding detection schemes for DG systems." International Journal of Power Electronics and Drive Systems (IJPEDS) 15, no. 2 (2024): 1190. http://dx.doi.org/10.11591/ijpeds.v15.i2.pp1190-1200.

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The penetration of grid integrated distributed generation (DG) in the present decade, has benefited rural communities, the environment, and the power sector. These renewable power sources based DGs could eliminate the need of extensive transmission networks, especially in remote areas, reduce emissions and improve power supply reliability. A significant drawback of grid integrated DG systems is the islanding of DG units, which puts workers' safety at risk and raises the possibility of damaging electrical infrastructure. Therefore, islanding detection techniques are used to reduce the danger as

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Sarojam, Praveen Raj Rajaswamy, and Joseph Sarojini Savier. "Design and verification of q-axis perturbation based active islanding detection schemes for DG systems." International Journal of Power Electronics and Drive Systems (IJPEDS) 15, no. 2 (2024): 1190–200. https://doi.org/10.11591/ijpeds.v15.i2.pp1190-1200.

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The penetration of grid integrated distributed generation (DG) in the present decade, has benefited rural communities, the environment, and the power sector. These renewable power sources based DGs could eliminate the need of extensive transmission networks, especially in remote areas, reduce emissions and improve power supply reliability. A significant drawback of grid integrated DG systems is the islanding of DG units, which puts workers' safety at risk and raises the possibility of damaging electrical infrastructure. Therefore, islanding detection techniques are used to reduce the danger as

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9

Dash, Santanu Kumar, and Pravat Kumar Ray. "Photovoltaic tied unified power quality conditioner topology based on a novel notch filter utilized control algorithm for power quality improvement." Transactions of the Institute of Measurement and Control 41, no. 7 (2018): 1912–22. http://dx.doi.org/10.1177/0142331218790314.

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Nonlinear loads and grid side disturbances in the power distribution network cause harmonic rich currents and voltage perturbations such as voltage harmonics, voltage sags and voltage swells. The unified power quality conditioner (UPQC) with shunt inverter and series inverter are usually employed for elimination of current and voltage related power quality issues. However, elimination of voltage and current quality issues in a grid connected Photovoltaic (PV) system is essential. Therefore, PV integrated UPQC topology is proposed in this paper with a novel controller for power quality improvem

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Baranov, Leonid, Anton Anohin, Il'ya Zherebyatin, and Yuncyan Chzhan. "Forecasting Random Processes in Intelligent Transport Systems with Singular Perturbations." Transport automation research 9, no. 3 (2023): 239–46. http://dx.doi.org/10.20295/2412-9186-2023-9-03-239-246.

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Forecasting random perturbations allows improving the control quality in intelligent transport systems and ensuring the efficient operation of diagnostic systems. Several works are known where extrapolator models based on Chebyshev polynomials orthogonal on equidistant points are presented. These models use a predictive polynomial whose coefficients are computed using the least squares criterion. Additionally, an analysis of forecast errors for random stationary input signals has been conducted. At the same time, in the case of non-stationary input signals, singular perturbations may occur, th

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Rossetto Moraes, Guido, Valentin Ilea, Alberto Berizzi, Cosimo Pisani, Giorgio Giannuzzi, and Roberto Zaottini. "A Perturbation-Based Methodology to Estimate the Equivalent Inertia of an Area Monitored by PMUs." Energies 14, no. 24 (2021): 8477. http://dx.doi.org/10.3390/en14248477.

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This paper proposes a novel methodology to estimate equivalent inertia of an area, observed from its boundary buses where Phasor Measurement Units (PMUs) are assumed to be installed. The areas are divided according to the measurement points, and the methodology proposed can obtain the equivalent dynamic response of the area dependent of or independent of coherency of the generators inside, which is the first contribution of this paper. The methodology is divided in three parts: estimating the frequency response, estimating the power imbalance and estimating inertia through the solution of the

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Mostarac, Petar, Roman Malarić, Katarina Mostarac, and Marko Jurčević. "Noise Reduction of Power Quality Measurements with Time-Frequency Depth Analysis." Energies 12, no. 6 (2019): 1052. http://dx.doi.org/10.3390/en12061052.

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This paper presents the noise reduction of power quality measurement with time-frequency (T-F) depth analysis. Noise reduction is achieved with wavelet transformation by decomposition, thresholding and lossless reconstruction of signal. Three main problems with T-F noise reduction with wavelet transformation are: defining thresholding levels, level of decomposition and number of wavelet vanishing moment. In this analysis decomposition level and number of vanishing moments are defined via simulation for pure sinusoid signal, these values are used for signals with perturbations and they provide

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Anjali and Sharma Gourav. "Power Quality Improvement in Grid Connected PV System." International Journal of Trend in Scientific Research and Development 1, no. 4 (2017): 552–57. https://doi.org/10.31142/ijtsrd2196.

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The general trends in the past decade of increasing solar cell efficiency, decreasing PV system costs, increasing government incentive programs, and several other factors have all combined synergistically to reduce the barriers of entry for PV systems to enter the market and expand their contribution to the global energy portfolio. The shortcomings of current inverter functions which link PV systems to the utility network are becoming transparent as PV penetration levels continue to increase. In this paper an analysis of solar system connected with the grid has been done. The system is subject

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SENGUPTA, R., N. DEY, A. K. DATTA, and D. GHOSH. "ASSESSMENT OF MUSICAL QUALITY OF TANPURA BY FRACTAL-DIMENSIONAL ANALYSIS." Fractals 13, no. 03 (2005): 245–52. http://dx.doi.org/10.1142/s0218348x05002891.

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Tanpura is a multi-stringed accompanying drone instrument extensively used in classical music in India. The instrument is plucked by finger. We know that jitter, shimmer and complexity perturbations (CP) are found also in tanpura signals. The source of origin of these perturbations was reported to be related to some sort of nonlinearity associated with the strings and their mode of attachment. The objective of the present study is to see in what way fractal-dimensional analysis may be helpful to relate the apparent nonlinearity and also if there is any relation of these dimensions with differe

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Dileep, Malyala S. Phani, Sravani Sattimsetti, and P. V. Prasuna. "Performance Improvement of the Grid Connected PV Inverter System with ANN Controller." International Journal of Engineering and Advanced Technology 10, no. 2 (2020): 141–47. http://dx.doi.org/10.35940/ijeat.b2068.1210220.

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The implementation of the PV system and its integration into the grid has been increased. In this process some power quality issues arise i.e. harmonics, voltage sags / surges, interruptions, flickers, transients, and this is due to non-linear loads, arc furnaces, frequent starting / stopping of electric motors, oscillating loads and interactions of different semiconductor devices. Within these interharmonics is one of the emerging power quality issues in grid-connected photovoltaic (PV) systems. Based on previous case studies and field measurements, evidence of interharmonic emission from max

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Sankara, Phani Dileep Malyala, Sattimsetti Sravani, and P.V.Prasuna. "Performance Improvement of the Grid Connected PV Inverter System with ANN Controller." International Journal of Engineering and Advanced Technology (IJEAT) 10, no. 2 (2020): 141–47. https://doi.org/10.5281/zenodo.5527382.

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The implementation of the PV system and its integration into the grid has been increased. In this process some power quality issues arise i.e. harmonics, voltage sags / surges, interruptions, flickers, transients, and this is due to non-linear loads, arc furnaces, frequent starting / stopping of electric motors, oscillating loads and interactions of different semiconductor devices. Within these interharmonics is one of the emerging power quality issues in grid-connected photovoltaic (PV) systems. Based on previous case studies and field measurements, evidence of interharmonic emission from max

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17

Abouelmahjoub, Younes, and Mohamed Moutchou. "Nonlinear control strategy of single-phase unified power flow controller." International Journal of Electrical and Computer Engineering (IJECE) 11, no. 4 (2021): 2864. http://dx.doi.org/10.11591/ijece.v11i4.pp2864-2875.

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In this work we propose a nonlinear control strategy of single-phase unified power flow controller (UPFC), using in order to enhance energy quality parameters of a perturbed single-phase power grid supplying nonlinear loads. The control objectives are: i) The current harmonics and the reactive power compensation, that ensure a satisfactory power factor correction (PFC) at the point of common coupling (PCC); ii) compensation of the voltage perturbations (harmonics and sags of voltage) in order to ensure the desired level, of load voltage, without distortion; iii) DC bus voltage regulation. The

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Younes, Abouelmahjoub, and Moutchou Mohamed. "Nonlinear control strategy of single-phase unified power flow controller." International Journal of Electrical and Computer Engineering (IJECE) 11, no. 4 (2021): 2864–75. https://doi.org/10.11591/ijece.v11i4.pp2864-2875.

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In this work we propose a nonlinear control strategy of single-phase unified power flow controller (UPFC), using in order to enhance energy quality parameters of a perturbed single-phase power grid supplying nonlinear loads. The control objectives are: i) The current harmonics and the reactive power compensation, that ensure a satisfactory power factor correction (PFC) at the point of common coupling (PCC); ii) compensation of the voltage perturbations (harmonics and sags of voltage) in order to ensure the desired level, of load voltage, without distortion; iii) DC bus voltage regulation. The

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19

Mohammed A AlAqil. "Harmonic Analysis of Power Quality in Grid-Connected Solar Photovoltaic (PV) Systems." Power System Technology 48, no. 4 (2024): 7081–98. https://doi.org/10.52783/pst.1530.

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The introduction of photovoltaic (PV) systems into the electrical grid has transformed the way renewable energy is adopted, but also presented problems such as terms of harmonic distortion as well as some power quality issues and concern regarding grid stability. This paper makes a thorough harmonic analysis of grid-connected PV systems and identifies the gaps in existing research and proposes cutting-edge techniques to mitigate harmonics. The proposed approach consists of adaptive techniques for harmonic mitigation with advanced Proportional-Resonant (PR) controllers with optimized hybrid fil

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Rajbir, Sood, and Kalpesh Geena. "THD Reduction and Power Quality Improvement in Grid Connected PV System." International Journal of Trend in Scientific Research and Development 1, no. 4 (2017): 429–33. https://doi.org/10.31142/ijtsrd173.

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In this paper an MPPT technique is applied in grid connected PV system to harness maximum available power available from sun. The shortcomings of current inverter functions which link PV systems to the utility network are becoming transparent as PV penetration levels continue to increase. In this paper an analysis of solar system connected with the grid has been done.The system is subjected with two types of perturbations, i.e. variable load and the variable irradiance level which changes the output of the solar system. The design, modeling, and analysis of a grid tied PV system are performed

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Abdallah, Ben Abdelkader, Abdelkhalek Othmane, Khalil Bousserhane Ismail, Amine Hartani Mohamed, and Omari Aymen. "A comparative study and experimental validation on single phase series active power filter control strategies using PI, FLC and sliding mode controllers." International Journal of Power Electronics and Drive System (IJPEDS) 10, no. 2 (2019): 731–43. https://doi.org/10.11591/ijpeds.v10.i2.pp731-743.

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sagswell and harmonics voltages problems that can affect the power quality. Among the devices that solve such power quality perturbations, the series active power Filter APFS is considered in this paper. Thus, a single phase APFS is developed through an analytic analysis, supported by an experimental validation, where we applied classical proportional integrator PI, fuzzy logic FLC and sliding mode SM controllers to improve the dynamic response of the APFS. In addition, a comparative study between these control strategies has made in order to mitigate voltage sag-swell and especially harmonics

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22

Zeng, Fang, and Hongchun Shu. "Memetic Salp Swarm Algorithm-Based Frequency Regulation for Power System with Renewable Energy Integration." Mathematical Problems in Engineering 2020 (December 14, 2020): 1–11. http://dx.doi.org/10.1155/2020/6661793.

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As the penetration of renewable energy to power grid increases gradually, to ensure the safety and stable operation of power system, it is necessary for renewable energy to participate in the secondary frequency regulation of power system. Therefore, this paper proposes an optimal control model of renewable energy participating in the secondary frequency regulation to solve the dynamic power distribution problem. Besides, memetic salp swarm algorithm (MSSA) is used to solve this complex nonlinear optimization problem, so as to quickly obtain high-quality power distribution schemes under differ

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Abass, Aaqib Ali, and Mairaj Ud-Din Mufti. "SimPower-based analysis and design of a hybrid wind–diesel-superconducting magnetic energy storage system for simultaneous frequency and voltage control." Wind Engineering 43, no. 6 (2019): 596–608. http://dx.doi.org/10.1177/0309524x18822265.

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Power quality control in a stand-alone power system is a demanding task. For satisfactory operation, such systems are being augmented with fast-acting energy storage devices. In this article, a stand-alone wind–diesel system augmented with a small-rating superconducting magnetic energy storage system is considered for both reactive and real power balance. Suitable controllers are proposed which force the superconducting magnetic energy storage system to exchange both reactive and real power with the system under various perturbations. A simulation platform is developed in SimPower to virtually

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Doitch, Amichay, Ram Yazdi, Tamir Hazan, and Roi Reichart. "Perturbation Based Learning for Structured NLP Tasks with Application to Dependency Parsing." Transactions of the Association for Computational Linguistics 7 (November 2019): 643–59. http://dx.doi.org/10.1162/tacl_a_00291.

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The best solution of structured prediction models in NLP is often inaccurate because of limited expressive power of the model or to non-exact parameter estimation. One way to mitigate this problem is sampling candidate solutions from the model’s solution space, reasoning that effective exploration of this space should yield high-quality solutions. Unfortunately, sampling is often computationally hard and many works hence back-off to sub-optimal strategies, such as extraction of the best scoring solutions of the model, which are not as diverse as sampled solutions. In this paper we propose a pe

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Zatsepina, V. I., E. P. Zatsepin, and P. I. Skomorokhov. "Improving the efficiency of power supply systems through the combined effect of voltage distortion." Power engineering: research, equipment, technology 21, no. 5 (2019): 79–86. http://dx.doi.org/10.30724/1998-9903-2019-21-5-79-86.

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In most cases, any abnormal mode in the distribution electrical network is eliminated by the action of relay protection and automation devices (RPA), i.e. - there is a shutdown of the damaged item. It is much more difficult to constantly maintain the normal key indicators of the quality of electrical energy in the network. With the advent of controlled voltage converters based on transistors IGCT and IGBT, static synchronous compensators STATCOM were developed. The main disadvantage of this kind of device is that the control output generated by them is static. Under conditions of increased lik

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Chinnappan, Ravichandran, Premalatha Logamani, and Rengaraj Ramasubbu. "Fixed- and variable-frequency sliding mode controller–maximum power point tracking converter for two-stage grid-integrated photovoltaic system employing nonlinear loads with power quality improvement features." Measurement and Control 52, no. 7-8 (2019): 896–912. http://dx.doi.org/10.1177/0020294019830120.

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This article presents a reliable and efficient photovoltaic sliding mode voltage-controlled maximum power point tracking DC-DC converter–active power filter integration system to supply real power to grid. This integrated active power filter system performs power quality enhancement features to compensate current harmonics to make distortion-free grid supply current and reactive power employing nonlinear loads. The proposed proportional–integral–derivative–based sliding mode controller is designed with fixed-frequency pulse-width modulation based on equivalent control approach. The main object

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Mrčela, Tomislav, and Tamara Zadravec. "Information Model Development – Attributes and Power of Information." Tehnički glasnik 16, no. 4 (2022): 542–45. http://dx.doi.org/10.31803/tg-20220207213350.

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Starting from the general concept of a system-process, which is defined by the quality of relations between individual elements, we can single out attributes whose elements have a dominant character of the information system, all in the projection of the quality of the observed process. In any state of the process, information is undoubtedly significant as a subsystem, whose property cannot be ignored, because it is a dynamic process that bases its dynamism in the time domain. The paper precisely defines the information power model as well as its response to the occurrence of perturbations in

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Ben Abdelkader, Abdallah, Othmane Abdelkhalek, Ismail Khalil Bousserhane, Mohamed Amine Hartani, and Aymen Omari. "A comparative study and experimental validation on single phase series active power filter control strategies using pi, flc and sliding mode controllers." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 2 (2019): 731. http://dx.doi.org/10.11591/ijpeds.v10.i2.pp731-743.

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<p><span>Sensitive loads are widely used in industrial, which is the main cause of sag-swell and harmonics voltages problems that can affect the power quality. Among the devices that solve such power quality perturbations, the series active power Filter APFS is considered in this paper. Thus, a single phase APFS is developed through an analytic analysis, supported by an experimental validation, where we applied classical proportional integrator PI, fuzzy logic FLC and <a name="_Hlk525422768"></a>sliding mode SM controllers to improve the dynamic response of the APFS. In

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Iturrino Garcia, Carlos Alberto, Marco Bindi, Fabio Corti, et al. "Power Quality Analysis Based on Machine Learning Methods for Low-Voltage Electrical Distribution Lines." Energies 16, no. 9 (2023): 3627. http://dx.doi.org/10.3390/en16093627.

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The main objective of this paper is to propose two innovative monitoring methods for electrical disturbances in low-voltage networks. The two approaches present a focus on the classification of voltage signals in the frequency domain using machine learning techniques. The first technique proposed here uses the Fourier transform (FT) of the voltage waveform and classifies the corresponding complex coefficients through a multilayered neural network with multivalued neurons (MLMVN). In this case, the classifier structure has three layers and a small number of neurons in the hidden layer. This all

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Shavranskyi, M. V. "Modeling and identification of the main units of the thermal power plant (TPP) acting as automation objects." Prospecting and Development of Oil and Gas Fields, no. 2(67) (May 10, 2018): 62–69. http://dx.doi.org/10.31471/1993-9973-2018-2(67)-62-69.

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On the basis of the analysis of the heat and power processes, the modeling and identification of the main units of the TPP has been carried out in order to increase the efficiency and reliability of the functioning of the automatic control systems of the inertial circuits of the TPP boiler units, which ensures the system’s reduction in sensitivity to uncertainties of the object itself, external perturbations, time delay variations along the control channels and disturbance, and thus guarantees the given quality of regulation in maneuverable modes of operation. The investigated transfer functio

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Nicholson, George, Hugh Morgan, Habib Ganjgahi, Steve D. M. Brown, Ann-Marie Mallon, and Chris Holmes. "Multivariate phenotype analysis enables genome-wide inference of mammalian gene function." PLOS Biology 20, no. 8 (2022): e3001723. http://dx.doi.org/10.1371/journal.pbio.3001723.

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The function of the majority of genes in the human and mouse genomes is unknown. Investigating and illuminating this dark genome is a major challenge for the biomedical sciences. The International Mouse Phenotyping Consortium (IMPC) is addressing this through the generation and broad-based phenotyping of a knockout (KO) mouse line for every protein-coding gene, producing a multidimensional data set that underlies a genome-wide annotation map from genes to phenotypes. Here, we develop a multivariate (MV) statistical approach and apply it to IMPC data comprising 148 phenotypes measured across 4,

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Boudechiche, G., O. Aissa, M. Sarra, and I. Griche. "Solar shunt active power filter based on optimized direct power control strategy with disturbance rejection principle." Electrical Engineering & Electromechanics, no. 3 (April 28, 2024): 72–80. http://dx.doi.org/10.20998/2074-272x.2024.3.10.

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Introduction. This paper focuses on a renewable energy system coupled to a dual purpose power grid via a parallel active power filter for injecting photovoltaic energy into the grid and improving the power quality in the presence of the non-linear load. The novelty of the work consists in the combination of two advanced techniques – Fuzzy Logic Controller (FLC) and the optimized Anti-Windup Fractional Order Proportional-Integral Differentiator (AW-FOPID) regulator based on Particle Swarm Optimization with the Spreading Factor (PSO-SF) algorithm, applied to the improved Direct Power Control (DP

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Igbonoba, E. E. C., and O. Omoifo. "Determination of DVB-T2 Signal Quality in Nigeria: A Case Study of Jos, Plateau State, Nigeria." Nigerian Journal of Technology 40, no. 1 (2021): 81–88. http://dx.doi.org/10.4314/njt.v40i1.12.

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This study presents the evaluation of digital video broadcasting-terrestrial second generation (DVB-T2) Television signal quality in Jos using Integrated Television Services Limited signal. The delivery of quality Television signal remains problematic in Nigeria due to signal attenuation and degradation between the transmitter and receiver station. This is primarily due to environmental and atmospheric perturbations prevalent along the signal paths. This research aim is to determine the signal quality of DVB-T2 Television system in Jos, Plateau State. The simple field measurement methodology w

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Billings, Rachel M., and Alan J. Michaels. "Real-Time Mask Recognition." IoT 2, no. 4 (2021): 688–716. http://dx.doi.org/10.3390/iot2040035.

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While a variety of image processing studies have been performed to quantify the potential performance of neural network-based models using high-quality still images, relatively few studies seek to apply those models to a real-time operational context. This paper seeks to extend prior work in neural-network-based mask detection algorithms to a real-time, low-power deployable context that is conducive to immediate installation and use. Particularly relevant in the COVID-19 era with varying rules on mask mandates, this work applies two neural network models to inference of mask detection in both

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Harasymiv, V. M., and T. H. Harasymiv. "Improvement of the transfer function quality indicators of the power control system at the electric drill engine shaft." Prospecting and Development of Oil and Gas Fields, no. 3(76) (September 27, 2020): 46–52. http://dx.doi.org/10.31471/1993-9973-2020-3(76)-46-52.

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In order to get better rigs performance the authors improve the schematic diagram of the power control system at the electric drill engine shaft using control input transfer function, where the electric drill is considered to be the control object which operates in conditions of a priori and current uncertainty under the influence of external perturbations. To improve the quality of the transient process under the conditions of changes in the parameters of the control object (when these parameters cannot be checked on), the authors have developed the algorithm of tuning the adaptive fuzzy PID

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El Mariachet, J., J. Matas, H. Martin, G. Tinoco, and S. Abdalinejad. "Proposal of Novel Single-Phase Power Quality Indicators considering subsynchronous frequency perturbations in Voltage and Current under non-sinusoidal conditions." Renewable Energy and Power Quality Journal 17 (July 2019): 530–35. http://dx.doi.org/10.24084/repqj17.366.

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Boudechiche, G., O. Aissa, M. Sarra, and I. Griche. "Solar shunt active power filter based on optimized direct power control strategy with disturbance rejection principle." Electrical Engineering and Electromechanics 2024, no. 3 (2024): 72–80. https://doi.org/10.20998/2074-272X.2024.3.10.

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<strong><em>Introduction</em></strong><em>. </em><em>This paper focuses on a renewable energy system coupled to a dual purpose power grid via a parallel active power filter for injecting photovoltaic energy into the grid and improving the power quality in the presence of the non-linear load</em><em>. <strong>The novelty</strong> of the work consists in the combination of two advanced techniques – Fuzzy Logic Controller (FLC) and the optimized Anti-Windup Fractional Order Proportional-Integral Differentiator (AW-FOPID) regulator based on Particle Swarm Optimization with the

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Co, Nhu Van, Phung Quang Nguyen, and Thanh Hai Nguyen. "Evaluation of the possibility of chaos for doubly-fed induction generator in wind power generation system." Evaluation of the possibility of chaos for doubly-fed induction generator in wind power generation system 14, no. 4 (2024): 1965–75. https://doi.org/10.11591/ijpeds.v14.i4.pp1965-1975.

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The doubly-fed induction generator (DFIG) has the advantages of compactness and low cost, so it has been applied more and more in practice. However, the structure of the DFIG system is complex, multivariable, nonlinear, and difficult to control. Chaos is a phenomenon that only occurs with nonlinear dynamical systems, sensitive to initial conditions and aperiodic but it is governed by deterministic laws, unlike random perturbations. For most powertrain systems, chaos causes disadvantages, reduce performance, and even destruction of the system. By method of analysis based on theory and simulatio

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Van, Co Nhu, Nguyen Phung Quang, and Nguyen Thanh Hai. "Evaluation of the possibility of chaos for doubly-fed induction generator in wind power generation system." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 4 (2023): 1965. http://dx.doi.org/10.11591/ijpeds.v14.i4.pp1965-1975.

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<span lang="EN-US">The doubly-fed induction generator (DFIG) has the advantages of compactness and low cost, so it has been applied more and more in practice. However, the structure of the DFIG system is complex, multivariable, nonlinear, and difficult to control. Chaos is a phenomenon that only occurs with nonlinear dynamical systems, sensitive to initial conditions and aperiodic but it is governed by deterministic laws, unlike random perturbations. For most powertrain systems, chaos causes disadvantages, reduce performance, and even destruction of the system. By method of analysis base

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Iqbal, M. Javed, Nasir M. Mirza, and Sikander M. Mirza. "Kinetic simulation of fission product activity in primary coolant of typical PWRs under power perturbations." Nuclear Engineering and Design 237, no. 2 (2007): 199–205. http://dx.doi.org/10.1016/j.nucengdes.2006.06.003.

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Hamanah, Waleed M., Abdullah Baraean, A. Hussein, and Mohammad A. Abido. "Stabilizing multimachine power systems with fuzzy logic using artificial bee colonies." Renewable Energy and Power Quality Journal 21, no. 1 (2023): 166–71. http://dx.doi.org/10.24084/repqj21.258.

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Over the past few years, fuzzy logic systems have gained popularity due to their superiority over classical controllers when it comes to enhancing the transient stability of power systems. In this paper, a Fuzzy Logic Power System Stabilizer (FLPSS) is designed to damp local and inter-area oscillations following disturbances through the use of an Artificial Bee Colony Optimization Algorithm (ABC). The designed FLPSS is expected to significantly increase the robustness of power systems and ultimately improve the quality of power supply to end-users. This test system consists of two areas with f

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Maksym V., Grishyn, Matiko Fedir D., Tarakhtij Olga S., Zhanko Kristina O., and Shynder Andriy A. "Mathematical model of a steam boiler as a control plant." Applied Aspects of Information Technology 6, no. 3 (2023): 244–57. http://dx.doi.org/10.15276/aait.06.2023.17.

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The article highlights the problems associated with unpredictable outages, uncertainties in fuel supply, unpredictable changes in coal quality, and deterioration of the infrastructure ofa thermal coal-fired power plant due to the use of high-ash fuels. Traditional methods of solving these problems lack adaptability and flexibility. The aim of the study was to improve the efficiency of operation of boiler units of thermal coal-fired powerplants, which consists in increasing the service life, by improving the models of thermal coal quality management under random perturbations of its composition

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Anuraj, Vijayan, Goverapet Srinivasan, and Kunhiraman Devan. "Stability characteristics of the 500 mw Indian PFBR." Nuclear Technology and Radiation Protection 30, no. 2 (2015): 113–23. http://dx.doi.org/10.2298/ntrp1502113a.

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After the successful operation of the fast breeder test reactor for over two decades, India is now nearing the completion of a 500 MW (electrical) prototype fast breeder reactor. This commercial scale power reactor is a sodium-cooled, pool-type, mixed-oxide fuelled fast reactor. The stability characteristics of the reactor are an important safety aspect to be studied. In the present work, linear stability of the prototype fast breeder reactor analysis is carried out using the transfer function method, while the stability of the system is checked via the Nyquist criteria. For the completeness o

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JOVANOVIĆ, GORAN, DARKO MITIĆ, MILE STOJČEV, and DRAGAN ANTIĆ. "SELF-TUNING BIQUAD BAND-PASS FILTER." Journal of Circuits, Systems and Computers 22, no. 03 (2013): 1350008. http://dx.doi.org/10.1142/s0218126613500084.

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One approach to design self-tuning gm-C biquad band-pass filter is considered in this paper. The phase control loop is introduced to force filter central frequency to be equal to input signal frequency what is achieved by adjusting the amplifier transconductance gm. Thanks to that, the filter is robust to parameter perturbations and it can be used as a selective amplifier. In the full tuning range, it has a constant maximum gain at central frequency as well as a constant bandwidth. The 0.25 μm SiGe BiCMOS technology was used during design and verification of the band-pass filter. The filter ha

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Knabenhans, M., J. Stadel, D. Potter, et al. "Euclid preparation: IX. EuclidEmulator2 – power spectrum emulation with massive neutrinos and self-consistent dark energy perturbations." Monthly Notices of the Royal Astronomical Society 505, no. 2 (2021): 2840–69. http://dx.doi.org/10.1093/mnras/stab1366.

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ABSTRACT We present a new, updated version of the EuclidEmulator (called EuclidEmulator2), a fast and accurate predictor for the nonlinear correction of the matter power spectrum. 2 per cent level accurate emulation is now supported in the eight-dimensional parameter space of w0waCDM+∑mν models between redshift z = 0 and z = 3 for spatial scales within the range $0.01 \, h\, {\rm Mpc}^{-1}\le k \le 10\, h\, {\rm Mpc}^{-1}$. In order to achieve this level of accuracy, we have had to improve the quality of the underlying N-body simulations used as training data: (i) we use self-consistent linear

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Yang, Fan, Xinyi Shao, Bo Zhou, Yuexing Shi, Yunwei Shen, and Dongdong Li. "Data-Driven Automatic Generation Control Based on Learning to Coordinate and Teach Reinforcement Mechanism." Symmetry 17, no. 6 (2025): 854. https://doi.org/10.3390/sym17060854.

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Large-scale integration of renewable energy introduces significant random perturbations to the power system, disrupting the symmetry and balance of active power, which complicates the stabilization of the system’s frequency. Inter-regional energy cooperation plays a crucial role in maintaining the symmetry and balance of the overall power system’s active power. However, when the power system area is expanded, automatic generation control (AGC) based on reinforcement learning faces the challenge of not being able to leverage the prior experience of the original system topology to train the new

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Bignucolo, Fabio, and Manuele Bertoluzzo. "Application of Solid-State Transformers in a Novel Architecture of Hybrid AC/DC House Power Systems." Energies 13, no. 13 (2020): 3432. http://dx.doi.org/10.3390/en13133432.

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The ongoing diffusion of solid-state DC/DC converters makes possible a partial migration of electric power systems from the present AC paradigm to a future DC scenario. In addition, the power demand in the domestic environment is expected to grow considerably, for example, due to the progressive diffusion of electric vehicles, induction cooking and heat pumps. To face this evolution, the paper introduces a novel electric topology for a hybrid AC/DC smart house, based on the solid-state transformer technology. The electric scheme, voltage levels and converters types are thoroughly discussed to

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Gomaa Haroun, A. H., and Yin-Ya Li. "Ant Lion Optimized Fractional Order Fuzzy Pre-Compensated Intelligent Pid Controller for Frequency Stabilization of Interconnected Multi-Area Power Systems." Applied System Innovation 2, no. 2 (2019): 17. http://dx.doi.org/10.3390/asi2020017.

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Load frequency control (LFC) is considered to be the most important strategy in interconnected multi-area power systems for satisfactory operation and distribution. In order to transfer reliable power with acceptable quality, an LFC mechanism requires highly efficacy and intelligent techniques. In this paper, a novel hybrid fractional order fuzzy pre-compensated intelligent proportional-integral-derivative (PID) (FOFP-iPID) controller is proposed for the LFC of a realistic interconnected two-area power system. The proposed FOFP-iPID controller is incorporated into the power system as a seconda

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Zargar, Mubashar Yaqoob, Mairaj Ud-Din Mufti, and Shameem Ahmad Lone. "Modelling and performance assessment of a standalone hybrid wind-diesel-superconducting magnetic energy storage system using four-quadrant operation of superconducting magnetic energy storage." Wind Engineering 42, no. 5 (2017): 496–509. http://dx.doi.org/10.1177/0309524x17750158.

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In this article, a comprehensive model for power quality assessment of a standalone wind-diesel-superconducting magnetic energy storage system is developed using firing angle control scheme of superconducting magnetic energy storage unit. A four-quadrant operation of superconducting magnetic energy storage unit is proposed where firing angle of superconducting magnetic energy storage converter is controlled depending upon active and reactive power demand of wind-diesel system, under various disturbances. Superconducting magnetic energy storage is designed as a controllable current source capab

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Torres Mendonça, Guilherme L., Julia Pongratz, and Christian H. Reick. "Identification of linear response functions from arbitrary perturbation experiments in the presence of noise – Part 2: Application to the land carbon cycle in the MPI Earth System Model." Nonlinear Processes in Geophysics 28, no. 4 (2021): 533–64. http://dx.doi.org/10.5194/npg-28-533-2021.

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Abstract. The response function identification method introduced in the first part of this study is applied here to investigate the land carbon cycle in the Max Planck Institute for Meteorology Earth System Model. We identify from standard C4MIP 1 % experiments the linear response functions that generalize the land carbon sensitivities β and γ. The identification of these generalized sensitivities is shown to be robust by demonstrating their predictive power when applied to experiments not used for their identification. The linear regime for which the generalized framework is valid is estimate

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