Statistical Analysis and Modeling of the Reliability of Overhead Low Voltage Lines
Published by Łukasz GRĄKOWSKI, Andrzej Ł. CHOJNACKI, Katarzyna GĘBCZYK, Kornelia BANASIK Kielce University of Technology, Faculty of Electrical Engineering, Automatic Control and Computer Science Abstract: The paper present a thorough analysis of seasonality and causes of failures of low voltage overhead lines. Such lines are mainly characteristic of rural areas. An average duration of failures, average duration of emergency shutdown and average duration of power supply interruptions were determined. Based on empirical data, probability density functions for the above-mentioned times were also determined. Streszczenie: W artykule przedstawiona została wnikliwa analiza sezonowości oraz przyczyn awarii linii napowietrznych niskiego napięcia. Linie takie…
Keep readingSwitching Strategies of Single Stage Battery based Microgrid
Published by Sudhakiran Ponnuru1, Ashok Kumar R1, Jothi Swaroopan NM2, Annamalai University (1), RMK Engineering College (2), India ORCID: 1. 0000-0002-5345-5709, 2. 0000-0001-6994-7591, 3. 0000-0001-7671-5190 Abstract. Renewable sources creates new opportunity when it is integrated with the microgrid increasing the energy efficiency of the system. This paper focuses on the adaptive control strategies which utilizes different energy management system for single stage PV based battery management system connected with the microgrid which operates on maximum power. The proposed system is carried in MATLAB/Simulink 2017B and its performance measures is demonstrated for different scenarios. Streszczenie. Źródła odnawialne stwarzają nowe możliwości, gdy…
Keep readingDifferential Relay Protection for Prototype Transformer
Published by Bashar M. SALIH, Mohammed A. IBRAHIM, Ali N. HAMOODI, Northern Technical University Abstract. This paper represents the differential protection relay that used to protect the prototype-Terco power transformer. Matlab/Simulink is used to simulate the protection system. The power differential protection algorithm has been simulated and tested on a 2KVA power transformer under different faults. During normal operating conditions, current will flow through all phase of the power transformer within predesigned values which are appropriate to these elements rating and the faults can be classified as the flow of a massive current. the results signify suitable completion. Streszczenie. W…
Keep readingResidual Current Devices in Installations with PV Energy Sources
Published by Stanislaw CZAPP, Gdańsk University of Technology. ORCID: 0000-0002-1341-8276 Abstract. The paper presents the principles of residual current devices (RCDs) application in photovoltaic (PV) installations. Provisions of standards in this regard are commented on, in particular, attention is drawn to the lack of obligation to use of RCDs in PV installations. The issue of the shape of the earth fault current and the level of leakage currents in such installations are discussed. These factors influence the selection of RCDs in terms of their rated residual operating current as well as the type of tripping characteristic. Streszczenie. W artykule przedstawiono…
Keep readingTotal Harmonic Distortion (THD) and Power Factor Calculation
Published by Alex Roderick, EE Power – Technical Articles: Total Harmonic Distortion (THD) and Power Factor Calculation, May 10, 2021. In this article, we will discuss how to measure total harmonic distortion and the power factor calculations utilized. Total harmonic distortion (THD) is the amount of harmonics on a line compared to the line fundamental frequency, e.g., 60Hz. The THD considers all of the harmonic frequencies on a line. THD can be related to either current harmonics or voltage harmonics, The following equation can be used to calculate the distortion of the line voltage: where Vn_rms is the RMS voltage of…
Keep readingShort-Term Forecasting of Photovoltaic Power Generation
Published by Roman KORAB1, Tomasz KANDZIA2, Tomasz NACZYŃSKI3, Silesian University of Technology, Department of Power Systems and Control. ORCID: 1. 0000-0002-6844-1342; 3. 0000-0001-6271-0516 Abstract. In this article, a method for short-term forecasting of photovoltaic (PV) generation was proposed. The proposed method belongs to the group of physical methods and is based on numerical weather forecasts. The generation forecast was determined using the PV source model in the OpenDSS software. The results of calculations were compared with the results of measurements from the operating PV micro-installations. Streszczenie. W artykule zaproponowana została metoda krótkoterminowego prognozowania generacji źródła fotowoltaicznego (PV). Metoda ta należy…
Keep readingImpact of EV Charging Stations Integration on Power System Performance
Published by Wisam Mohamed Najem1, Shaker M. Khudher2, Omar Sh. Alyozbaky3, Department of Electrical Engineering, College of Engineering, University of Mosul, Iraq (1,2,3) ORCID: 1.0000‐0002‐9611‐6416; 2.0000‐0003‐3158‐7900; 3.0000‐0002‐9735‐1469 Abstract. Electric vehicles partner with clean energy to prevent carbon emissions attributed to internal combustion engine-powered traditional vehicles, gas-based power plants, and other environmental pollution sources. At the same time, using electric vehicles adversely affects power infrastructure; hence, analytical research is crucial to assess such effects. This paper is based on several scenarios comprising a rising number of vehicles connected to the electrical system. The adverse effects of electric vehicle charging stations connected…
Keep readingAnalysis of Faults on High Voltage Direct Current HVDC Transmissions System
Published by Alya Hamid AL-RIFAIE1, Sanabel Muhson ALHAJ ZBER2, Noha Abed-AL-Bary AL-JAWADY3, Ahmed A. Abdullah AL-KARAKCHI4, Northern Technical University, Iraq. ORCID: 1. 0000-0002-7978-2193; 2. 0000-0003-0232-9064; 3. 0000-0002-0275-2527; 4. 0000-0003-1151-3015 Abstract. High Voltage Direct Current (HVDC) Transmission with Voltage Source Converters (VSC) is gaining substantial interest from several utilities for various applications as compared to traditional HVDC transmission rely on thyristor technique. The paper presents analysis of three-level VSC-HVDC system during faults on the AC part. The system model is simulated in MATLAB/Simulink, with various faults analysed, such as single line to ground, line to line and double line to ground…
Keep readingPhysical Model of Power Circuit of Three-Phase Electric Arc Furnace
Published by Mirosław WCIŚLIK, Paweł STRZĄBAŁA, Kielce University of Technology, Department of Electric Engineering, Automatic Control and Computer Science Abstract. The paper deals a model of the circuit arc furnace designed for electrotechnology or fundamentals of electrical engineering laboratory. This model works at low currents, without high temperature components. In this way, the cooling and dissipation of energy are avoided. This model allows the study of the impact of the supply system restrictions, reactive power compensation problems, harmonic propagation in the system and characteristics verification designated analytically or by simulation. Streszczenie. W pracy przedstawiono model obwodu pieca łukowego przeznaczony do…
Keep readingInter-Turns Short Circuits in Stator Winding of Squirrel-Cage Induction Motor
Published by Maciej ANTAL, Wrocław University of Science and Technology, Department of Electrical Machines, Drives and Measurements Abstract. A physical model of a squirrel-cage induction drive, allowing to stimulate coil short circuits in the front part of the motor, was used to investigate the phenomena accompanying short circuits. Assuming that a short circuit occurs during motor operation, phase stator current time waveforms, current in short-circuited coils and instant power were measured. Various cases of coil short circuits were analysed. The influence of the resistance value of the short-circuit point and short-circuit magnitude on electromechanical phenomena occurring during a stator winding…
Keep readingLaboratory Research of Non-Overvoltage Transistors Control Method in AC Voltage PWM Controller
Published by Andrzej KANDYBA1, Marian HYLA2, Igor KURYTNIK3, The Polish Engineers and Technicians Association SIMP Group Silesia (1), Silesian University of Technology, Faculty of Electrical Engineering (2), State School of Higher Education in Oświęcim (3) Abstract. Method of controlling transistors in AC voltage PWM controller aimed at eliminating commutation overvoltages is presented in the paper. The method is based upon keeping continuity of load current; this is achieved by appropriate control of transistors on the basis of detecting voltage sign (polarity) at the supply terminal and detecting load current sign (polarity). This type of control does not depend on character…
Keep readingAccurate Fault Detection and Location in Power Transmission Line Using Concurrent Neuro Fuzzy Technique
Published by Patrick S. Pouabe Eboule, & Ali N. Hasan, University of Johannesburg, South Africa Abstract. In this paper a new approach for the detecting and locating different kinds of faults on power transmission lines using the concurrent neurofuzzy technique (CNF) is introduced. This approach relies on the advantages of combining fuzzy logic (FL) and the artificial neural network (ANN) to detect, classify and locate faults on a power transmission line that carries high voltage and very high voltage of 400 kV and 750 kV respectively over short distance and long distance of 120 km and 600 km respectively. Results…
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