Simulation of the Higher Harmonics Source Determination in Power Supply Systems

2021 ◽  
Author(s):  
V. I. Biryulin ◽  
D. V. Kudelina ◽  
A. N. Gorlov
Keyword(s):  
Power Supply ◽  
Higher Harmonics ◽  
Source Determination ◽  
Supply Systems

scholarly journals EVALUATION OF ADDITIONAL LOSSES AND EFFICIENCY ELECTRICITY CONSUMPTION REGULATION IN LOCAL POWER SUPPLY SYSTEMS

2020 ◽  
pp. 7-21
Author(s):  
S. Denysiuk ◽  
T. Bazyuk
Keyword(s):  
Power Consumption ◽  
Electric Power ◽  
Power Supply ◽  
Electricity Consumption ◽  
Total Power ◽  
Local Power ◽  
Higher Harmonics ◽  
Total Power Consumption ◽  
Supply Systems ◽  
Additional Losses

Peculiarities of estimation of total energy losses in electric networks and estimation of nature of electricity consumption in local power supply systems (LES) are given. The structure of additional electricity losses in LES in the presence of higher harmonics of current and voltage is carried out, the generalized schedule of instantaneous functions of current i(t), voltage u(t), and power p(t) on components. The offered indicators of an estimation of the performance of criterion of a minimum of losses of the electric power in LES allow to estimate levels of distortion of power processes at consideration both exchange processes, and at the analysis of additional losses of the electric power. The accuracy of measuring the integrated characteristics of energy exchange depending on the available levels of distortion of voltage and current signals is considered. It is shown that in order to take into account the influence of higher harmonics on the total power consumption, it is necessary to determine the change of Frize QFpower as an indicator of additional electricity losses in the presence of non-sinusoidal currents and voltages in at different ratios between the value of current and voltage of the first and higher harmonics. The evaluation of the efficiency of power consumption regulation using the Frize QF power at an arbitrary time interval, as well as the corresponding current distribution into active and reactive components are considered. The peculiarities of increasing the efficiency of power consumption regulation in LES at the cyclic change of generator parameters and load are analysed.

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 Calculation of resonant modes for power supply systems and development of measures on higher harmonics filtering

2019 ◽  
Vol 1260 ◽  
pp. 052025
Author(s):  
D S Osipov ◽  
D V Kovalenko ◽  
E N Eremin ◽  
O A Sidorov ◽  
A Ya Bigun
Keyword(s):  
Power Supply ◽  
Higher Harmonics ◽  
Resonant Modes ◽  
Supply Systems

scholarly journals CALCULATION OF CURRENTS RESONANCE AT HIGHER HARMONICS IN POWER SUPPLY SYSTEMS BASED ON WAVELET PACKET TRANSFORM

2017 ◽  
Vol 5 (3) ◽  
pp. 068-078
Author(s):  
Dmitry S. Osipov ◽  
◽  
Dmitry V. Kovalenko ◽  
Nadezda N. Dolgikh ◽  
◽  
...  
Keyword(s):  
Power Supply ◽  
Wavelet Packet ◽  
Wavelet Packet Transform ◽  
Higher Harmonics ◽  
Supply Systems

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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