scholarly journals Improving the quality of electricity in the power supply systems of the mineral resource complex with hybrid filter-compensating devices

2021 ◽  
Vol 247 ◽  
pp. 132-140
Author(s):  
Yurii Sychev ◽  
Roman Zimin
Keyword(s):  
Mineral Resource ◽  
Mathematical Models ◽  
Power Quality ◽  
Power Supply ◽  
Active Filters ◽  
Hybrid Filter ◽  
Higher Harmonics ◽  
Compensating Devices ◽  
Supply Systems

The urgency and necessity of choosing and justifying the structures of hybrid filter-compensating devices based on series and parallel active filters to improve the quality of electricity in the power supply systems of enterprises of the mineral resource complex is shown. Mathematical models of hybrid filter compensating devices based on parallel and series active filters have been developed. Based on these mathematical models, computer simulation models of the indicated hybrid structures have been developed. The results of simulation showed the effectiveness of the correction of power quality indicators in terms of reducing the level of higher harmonics of current and voltage, as well as voltage deviations. The degree of influence of filter-compensating devices on the power quality indicators, which determine the continuity and stability of the technological process at the enterprises of the mineral resource complex, have been revealed. It has been established that a hybrid filter-compensating device based on a parallel active filter can reduce the level of higher harmonics of current and voltage by more than 90 and 70 %, respectively, and based on a series active filter, it can reduce the level of higher harmonics of voltage by more than 80 %. Based on the simulation results, the possibility of compensating for the reactive power of a hybrid structure based on parallel active and passive filters has been revealed. The possibility of integrating hybrid filter-compensating devices into more complex multifunctional electrical systems for the automated improvement of the quality of electricity is substantiated, as well as the expediency and prospects of their use in combined power supply systems based on the parallel operation of centralized and autonomous sources of distributed generation.

scholarly journals The assesement of the shunt active filter efficiency under varied power supply source and load parameters

2020 ◽  
Vol 10 (6) ◽  
pp. 5621 ◽  
Author(s):  
Yuriy Sychev ◽  
Boris Abramovich ◽  
Veronika Prokhorova
Keyword(s):  
Computer Simulation ◽  
Power Quality ◽  
Distributed Generation ◽  
Power Supply ◽  
Active Filters ◽  
Control Algorithms ◽  
Shunt Active Filter ◽  
Combined Power Supply ◽  
Power Quality Improvement ◽  
Supply Systems

The results of theoretical and experimental studies on the problems of effective application of shunt active filters for power quality improvement and electromagnetic compatibility ensuring were presented in this article. Based on the different theories and methods, the most effective and well-studied control algorithms of shunt active filters were determined and analyzed to ensure their effective application in distributed generation systems and combined power supply systems. Mathematical and computer simulation models of shunt active filters with different control algorithms in distributed generation systems and combined power supply systems were developed. According to the results of mathematical modeling and computer simulation, the dependences were detected, reflecting the influences of internal and external parameters on the factors, determining the efficiency of the correction of power quality indicators. The range of permissible changes in the parameters of shunt active filters by saving the required efficiency level of power quality correction was detected under varied power supply system characteristics, load parameters and also in hybrid structures. The adaptive algorithm of the shunt active filter functioning under varied application conditions for automated power quality improvement is developed on the basis

scholarly journals Analyzing the potential for using active filters to reduce voltage nonsinusoidality in the electric power supply system of a coal open-cut in Vietnam

2019 ◽  
Vol 114 ◽  
pp. 04006
Author(s):  
Bui Ngoc Hung ◽  
Lidiia I. Kovernikova
Keyword(s):  
Power Quality ◽  
Power Supply ◽  
Power Supply System ◽  
Reactive Power ◽  
Experimental Studies ◽  
Electrical Equipment ◽  
Supply System ◽  
Active Filters ◽  
Electric Power Supply ◽  
Supply Systems

Coal mining is one of the important economic sectors in Vietnam. Power supply systems of coal mines and open-cuts are complex. They have multiple levels of voltages and different types of loads. New electrical equipment usually works alongside with the equipment that is obsolete and worn-out. Power supply systems of industrial areas of Vietnam where coal is mined are characterized by the low power quality. In Vietnam the indices which characterize the distortion of both voltage and current waveforms have standard values. The article presents the findings upon the analysis of a power supply system of a coal open-cut in Vietnam and the electrical equipment of the coal sorting plant along with the results of the experimental studies of power quality indices and the non-sinusoidal mode parameters. The measurement analysis has shown that the indices of the 5-th and 7-th harmonics of voltage were over the limits. There are interharmonics in voltages and currents. The article analyzes the characteristics of active filters. It is possible to improve the power quality by using an active filter which generates both reactive power to increase the load power factor and harmonic and interharmonic currents to reduce the degree of voltage and current waveform distortion.

Power Quality and Resonances in Power Supply Systems with Non-Sinusoidal Loads

2017 ◽  
Vol 25 ◽  
pp. 143-150
Author(s):  
Yurii Papaika ◽  
Oleksandra Lysenko ◽  
Grzegorz Kosobudzki
Keyword(s):  
Spectral Analysis ◽  
Power Quality ◽  
Coal Mine ◽  
Power Supply ◽  
Electromagnetic Compatibility ◽  
Electrical Networks ◽  
Voltage Quality ◽  
The Impact ◽  
Supply Systems

The stress is made on the necessity to take into account the impact of higher while analysing the quality of voltage in power supply systems of coal mine. The process of resonances in power supply systems is explained in terms of physics, the sources generating this kind of interference are described. Mathematical dependences that allow to identify resonances in power supply systems are provided. The focus is placed on the feasibility of using spectral analysis in computations. To investigate the understudied aspects of voltage quality and electromagnetic compatibility and provide mathematical description for the analysis of resonances in electrical networks with powerful non-sinusoidal loads.

scholarly journals ANALYSIS OF THE MAIN COMPONENTS OF EFFICIENCY OF POWER SUPPLY SYSTEMS TO RURAL CONSUMERS

2019 ◽  
Vol 14 (3) ◽  
pp. 96-102
Author(s):  
Александр Виноградов ◽  
Aleksandr Vinogradov ◽  
Алина Виноградова ◽  
Alina Vinogradova
Keyword(s):  
Power Quality ◽  
Power Supply ◽  
Methodological Approach ◽  
Quality Of Services ◽  
Electricity Supply ◽  
Time Dependencies ◽  
Rural Consumers ◽  
Main Components ◽  
Supply Systems

Interpretation of the efficiency of power supply systems is proposed, according to which the main criterion of efficiency is minimization of costs for the operation of the power supply system under certain conditions related to the reliability of power supply, power quality and timing of technological connections. The methodological approach to improving the efficiency of power supply systems for rural consumers requires the development of efficiency criteria that would allow all measures to improve the reliability of electricity supply, power quality, shorten time and improve the quality of technological connections to lead to uniform indicators by which to evaluate the effectiveness of these measures. The costs arising from the operation of power supply systems can be divided into stimulating and providing. Both of these components, in turn, are also divided, while the stimulating costs include those components of costs that stimulate electricity supply companies to comply with the requirements of reliability of power supply, power quality, quality of services of technical connections. Regulation of incentive costs, which include damages from interruptions in power supply, compensation costs, lost profits, etc. allows you to manage the efficiency of power supply systems. Providing costs include investment and operating costs, since these types of costs provide the ability to fulfill the conditions of quality of services provided by electricity supply companies. All components of the costs associated with the values ​​of the time of interruptions in the power supply, the time of the mismatch of the quality of electricity and the time of the technical connections. The dependencies of component costs on the time of interruptions in power supply are shown. These dependencies can be interpreted in the opposite version, as time dependencies on costs. This reading allows them to develop incentive mechanisms for energy companies and consumers to improve the reliability of power supply, power quality and quality of connection services.

scholarly journals Power quality in power supply systems of mining and processing enterprises in Russia

2021 ◽  
Vol 25 (3) ◽  
pp. 356-368
Author(s):  
V. I. Panteleev ◽  
I. S. Kuzmin ◽  
A. A. Zavalov ◽  
A. V. Tikhonov ◽  
E. V. Umetskaia
Keyword(s):  
Power Quality ◽  
Power Supply ◽  
Electrical Power ◽  
Load Factor ◽  
Electric Motors ◽  
Higher Harmonics ◽  
Frequency Converters ◽  
Receiver System ◽  
Thyristor Converters ◽  
Supply Systems

This paper investigates the effect of the load factor of frequency converters and thyristor converters on electrical power quality. Recommendations for reducing the influence of higher harmonics and switching overvoltages on the characteristics of electrical power are provided. Higher harmonics were measured by a PKK57 complex device for controlling electrical parameters and a digital oscilloscope of the Tektronix TDS 2024V type. Impulse switching overvoltages were recorded by an active resistance divider of the DNEK-10 type and the above-mentioned oscilloscope. The obtained data were processed by the Loginom 6.4 software and the methods of mathematical statistics. The lower threshold level of the load factor of frequency converters and thyristor converters was set equal to 0.8, at which the sinusoidal distortion of voltage curves correspond to the RF standard of electrical power quality. The suppression degree of higher harmonics from the 5th to 17th frequency by power transformers with a capacity of 250–6,300 kV. A ranged from 95 to 45%. The use of the ‘transformer–converter–electric receiver’ system as applied to the power supply systems of mining and processing enterprises was substantiated. It was shown that electric motors with a capacity of up to 2,500 kW inclusively require protection against switching overvoltages. Conventional RC-absorbers based on RC-circuits connected to the terminals of electric motors are shown to be highly efficient for protecting electric motors against switching overvoltages. Thus, the quality of electrical power in power supply systems of mining and processing enterprises in Russia can be ensured by frequency converters and thyristor converters with a load factor of 0.8 or greater. Provided that the transformer capacity does not exceed 1,000 kV. A, a more efficient and less expensive ‘transformer–converter–electrical receiver’ system is recommended. Effective protection of electric motors of up to 2,500 kW inclusive can be provided using the proposed conventional RC absorber, which maintains the overvoltage rate at a level not exceeding 1.7.

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