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Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/35393

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Improving the Quality of Electrical Energy in the Railway Power Supply System
(Institute of Electrical and Electronics Engineers, 2018) Sokol, Yevgen I.; Zamaruiev, Volodymyr V.; Ivakhno, Volodymyr V.; Styslo, Bohdan O.
The pulsating mode of the power consumption in the railroad power supply network is the cause of the occurrence of voltage pulsations in the contact network. This leads to a decrease in the efficiency of the energy system. To compensate power fluctuations in the electric power supply network of the railway, it is proposed to use hybrid electric energy storage devices. The use of two-channel additional traction power station with an appropriate control system was proposed. The basis of the mathematical model is the data of real measurements.
Improvement of power quality in grid-connected hybrid system with power monitoring and control based on internet of things approach
(Національний технічний університет "Харківський політехнічний інститут", 2022) Balakishan, Padakanti ; Chidambaram, Ilanji Akilandam; Manikandan, Mani
This article proposes a new control monitoring grid connected hybrid system. The proposed system, improvement of power quality is achieved with internet of things power monitoring approach in solar photovoltaic grid system network. The novelty of the proposed work consists in presenting solar power monitoring and power control based internet of things algorithm, to generate DC voltage and maintain the constant voltage for grid connected hybrid system. Methods. The proposed algorithm which provides sophisticated and cost-effective solution for measuring the fault and as maximum power point tracking assures controlled output and supports the extraction of complete power from the photovoltaic panel. The objective of the work is to monitor and control the grid statistics for reliable and efficient delivery of power to a hybrid power generation system. Internet of things is regarded as a network comprising of electronic embedded devices, physical objects, network connections, and sensors enabling the sensing, analysis, and exchange of data. The proposed control technique strategy is validated using MATLAB/Simulink software and real time implementation to analysis the working performances. Results. The results obtained show that the power quality issue, the proposed system to overcome through monitoring of fault solar panel and improving of power quality. The obtained output from the hybrid system is fed to the grid through a 3ϕ voltage source inverter is more reliable and maintained power quality. The power obtained from the entire hybrid setup is measured by the sensor present in the internet of things-based module. In addition to that, the photovoltaic voltage is improved by a boost converter and optimum reliability is obtained with the adoption of the perturb & observe approach. The challenges in the integration of internet of things – smart grid must be overcome for the network to function efficiently. Originality. Compensation of power quality issues, grid stability and harmonic reduction in distribution network by using photovoltaic based internet of things approach is utilized along with sensor controller. Practical value. The work concerns a network comprising of electronic embedded devices, physical objects, network connections, and sensors enabling the sensing, analysis, and exchange of data. In this paper, internet of things sensors are installed in various stages of the smart grid in a hybrid photovoltaic – wind system. It tracks and manages network statistics for safe and efficient power delivery. The study is validated by the simulation results based on MATLAB/Simulink software and real time implementation.
Energy efficiency of a 3-level shunt active power filter powered by a fuel-cell/battery dc bus with regulated duty cycles
(Національний технічний університет "Харківський політехнічний інститут", 2021) Bourouis, Billel; Djeghloud, Hind; Benalla, Hocine
Nowadays, electrical energy is indispensable in industrial, tertiary and domestic appliances. However, its efficiency is becoming affected by the presence of the disturbances that appear in the electrical networks such as harmonics, unbalance, sags/swells, flickers …etc. Indeed, the disturbances cause a decrease in the power factor and an increase in the power losses. In this paper, the harmonic disturbance is considered and a 3-level shunt active power filter powered by a hybrid fuel-cell/battery DC is applied to mitigate current harmonic components from the electrical feeder. Aim. Studying the energy efficiency of a system based on a 3-level shunt active filter powered by a hybrid fuel-cell/battery DC bus. Methodology. It is a matter of finding the suitable formulas that express the efficiency and the relative power losses according to the load factor (which is the ratio between the shortcircuit active power and the load active power) and the load power factor. The DC bus energy is controlled using an energy management algorithm that contributes in generating the required reference input currents and output voltages of the fuel-cell and the battery. The DC/DC converters control circuits are performed in a closed loop by means of regulated duty cycles. Results. The simulation results carried-out under MATLAB/Simulink environment show better filtering quality if compared with the case of open loop control of the DC/DC converters and lesser differences between the fuel-cell power, the battery power and their respective reference powers. Which concerns the energy efficiency, the results demonstrate that higher efficiency and lower relative power losses can be achieved only when higher load factor and load power factor are attained. Therefore, the compensating system of the power factor is very important to improve the energy efficiency.
An effective control algorithm for dynamic voltage restorer under symmetrical and asymmetrical grid voltage conditions
(Національний технічний університет "Харківський політехнічний інститут", 2021) Boussaid, Abdelfettah; Chelli, Seif El Islam; Nemmour, Ahmed Lokmane; Khezzar, Abdelmalek
Voltage sag, which is associated to a transitory drop in the root mean square voltage characterizing an electrical source network. During these perturbations, the corresponding electronic customers and devices will suffer from serious operating troubles causing dangerous damages. Purpose. In order to attenuate this disturbance effects, the Controlled Dynamic Voltage Restorer constitutes a very interesting solution among many others that have been proposed. The novelty of the proposed work consists in presenting an enhanced algorithm to control efficiently the dynamic voltage restorer when voltage sag is suddenly occurred. Methods. The proposed algorithm is based on an instantaneous phase locked loop using a multi variable filter to synthesize unitary signals involved in compensation voltages computation relative to the sag apparition. Practical value. A detailed study concerning typical voltage sag, which is consolidated by simulation and experimental results, is conducted to show the used algorithm’s effectiveness to cancel the corresponding voltage sag.
Активный выпрямитель с функцией коррекции коэффициента мощности для тяговой подстанции скоростной железной дороги
(Georgian technical university, 2019) Сокол, Евгений Иванович; Сыченко, Виктор Григорьевич; Замаруев, Владимир Васильевич; Войтович, Юрий Сергеевич; Стысло, Богдан Александрович
Целью работы является совершенствование подходов к обеспечению требуемых качественных параметров напряжения в тяговых сетях на основе современных технологий и оборудования. Пульсирующий режим энергопотребления в железнодорожной электросети является причиной возникновения пульсаций напряжения в контактной сети. Предложено использование активных выпрямителей в системе электропитания железной дороги. Разработана система управления преобразователем, который позволяет выполнить стабилизацию выходного напряжения в звене постоянного тока и обеспечивает единичный коэффициент мощности, потребляемой преобразователем и THD тока потребления на уровне 8%. Разработана математическая модель преобразователя и выполнено исследование его основных режимов работы.
Electronic phase shifting in multipulse rectifier
(Sciendo, 2017) Sokol, Yevgen I.; Zamaruiev, Volodymyr V.; Ivakhno, Volodymyr V.; Voitovych, Yurii
This paper presents a novel converter which can reduce the harmonics like the conventional multipulse converters with input three phase transformer. To reduce total harmonic distortion of input current and improve the weight and size of converters, it is suggested to use multi-pulse rectifiers with an electronic phase shift. The basic module is a 6-pulse rectifier on fully controlled switches with the reverse blocking ability. Switching frequency either coincides or is twice the power frequency. The proposed solutions allow refusing from the electromagnetic phase-shifting devices (power transformers or auto-transformers) and thereby significantly reduce the weight of the device. Unlike power factor correction systems with high-frequency modulation, the proposed converters are significantly different, as they have better electromagnetic compatibility and the virtual absence of dynamic switching losses of power switches.
AC/DC converter for DC traction power supply system with high-speed train operation
(2019) Sokol, Yevgen I. ; Sychenko, Viktor; Voitovych, Yurii; Kosariev, Yevhen; Styslo, Bohdan; Hubskyi, Petro
Purpose of the work is improved approaches to ensure the required quality parameters of voltage in the traction network based on modern technologies and equipment. The pulsating mode of the power consumption in the railroad power supply network is the cause of the occurrence of voltage pulsations in the contact network. The use of active rectifiers in the electric power supply system of the railroad is proposed. The control system is developed by the converter, which allows to stabilize the output voltage in the DC link and also provides the unit power factor consumed by the converter and the THD consumption current at the level of 8%. A mathematical model of the converter was developed and a study of its main modes of operation was performed.
An adaptive harmonic compensation strategy for three-phase shunt active power filter based on double second-order generalized integrator with prefilter
(Національний технічний університет "Харківський політехнічний інститут", 2020) Kalkoul, Sami; Benalla, Hocine; Nabti, Khalil; Abdellatif, Reama
This study presents a straightforward adaptive prefiltering algorithm based on a double second-order generalized integrator with prefilter to solve one of the power quality issues, this algorithm is in charge of the determination of the reference harmonic currents in the control of three-phase shunt active power filter which presents an effective way to enhance the grid current quality. The proposed algorithm is used twice, to extract the harmonic currents produced by the non-linear loads and be an interesting part in the estimation of the frequency and amplitude of the fundamental voltage in various anomalies which can be noticed on the grid voltage. The performance, precision, and robustness of the proposed method are evidenced under balanced, unbalanced, and distorted grid voltage in the simulation and experimental results obtained by the implementation of the shunt active power filter on MATLAB-Simulink environment and the dSPACE 1104 platform respectively.
Rogowsky coil applications for power measurement under non-sinusoidal field conditions
(Lietuvos mokslų akademija, Lithuania, 2019) Diahovchenko, Illia; Mykhailyshyn, Roman; Danylchenko, Dmytro; Shevchenko, Serhii
Electric energy measurement errors depend on the design and algorithms used in electricity meters, as well as on the auxiliary and embedded sensors’ accuracy and bandwidth (or more precisely, maximum measurable frequency). Poor power quality may affect the electric energy meters accuracy, which will lead to the improper power accounting. In this article the applications of the Rogowsky coil sensors for electric energy measurement are studied. The advantages and the challenges of this sensor type implementation are discussed, and the operation scheme of the power meter for the separate measurement of the fundamental harmonic’s electric energy and the higher harmonics electric energy is proposed. The possibility of implementation of responsibility determining methods for power quality distortion is highlighted.
Новый бестрансформаторный многопульсный выпрямитель с электронным сдвигом фаз
(Національний технічний університет "Харківський політехнічний інститут", 2016) Сокол, Евгений Иванович; Замаруев, Владимир Васильевич; Ивахно, Владимир Викторович; Бутова, Ольга Анатольевна; Войтович, Юрий Сергеевич
В статье представлен новый многопульсный выпрямитель, который, как и обычные многопульсные выпрямители с входными трехфазными трансформаторами, позволяет снизить величину гармоник входного тока. Для снижения коэффициент нелинейных искажений входного тока выпрямителя и улучшения его массогабаритных показателей, предлагается использовать электронный сдвиг фаз. Базовым модулем выпрямителя является 6-пульсный выпрямитель на полностью управляемых ключах с обратной блокирующей способностью. Частота коммутации ключей совпадает с частотой сети либо вдвое выше ее. Предлагаемое решение позволяет исключить электромагнитные фазосдвигающие устройства, такие как трансформаторы или автотрансформаторы, за счет чего существенно снижается масса установки в целом. Преобразователь с электронным сдвигом фаз существенно отличается от систем коррекции коэффициента мощности, использующих высокочастотную модуляцию, имея лучшую электромагнитную совместимость и фактическое отсутствие динамических потерь в силовых ключах.

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