scholarly journals Power converter with active suppression of higher harmonics for aircraft power supply systems

2020 ◽  
pp. 417-428
Author(s):  
A.S. Anuchin ◽  
V.I. Kulmanov ◽  
R. Strzelecki ◽  
G.L. Demidova
Keyword(s):  
Power Supply ◽  
Power Converter ◽  
Higher Harmonics ◽  
Active Suppression ◽  
Supply Systems

Fault Tolerant Systems

2016 ◽  
pp. 408-434
Keyword(s):  
Fault Tolerance ◽  
Power Supply ◽  
Fault Tolerant ◽  
Power Converter ◽  
Functional Requirements ◽  
Functional Capabilities ◽  
Fault Tolerant Systems ◽  
Free Environment ◽  
Supply Systems ◽  
Redundant Systems

Another alternative derating, which was described in the previous chapter, is application of fault tolerant structures for the power converter. Fault tolerance is the property that enables a system to continue operating properly in the event of a failure of (or one or more faults within) some of its components. Fault tolerant systems are systems that can be operating after fault occurrence with no degraded performance in their basic functional requirements. This is the main difference between fault tolerant systems and derated systems. In this chapter, some methods for fault tolerance in electric power converters are presented. Fault tolerance is almost the only method for achieving a desired reliability in a converter that operates with non-zero fault possibility. There are two main approaches for this aim: re-configuration of the faulty system and using redundant systems. Redundancy is the provision of functional capabilities that would be unnecessary in a fault-free environment. Various types of redundant systems as passive and active redundancy are described and their application in power supply systems is presented. A new approach for a reliable and fault tolerant power supply is proposed and justified with experimental results. The concept of fault tolerance in electrical machines is presented.

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 Characteristic example of insulation coordination in power converters

2021 ◽  
Vol 31 (31) ◽  
pp. 57-84
Author(s):  
Željko Despotović
Keyword(s):  
Power Systems ◽  
Power Electronics ◽  
Power Supply ◽  
Power Converter ◽  
Passive Components ◽  
Ac Drive ◽  
Low Levels ◽  
Different Origins ◽  
Insulation Coordination ◽  
Supply Systems

Power electronics devices and modules that are most often used in power supply systems when compared to the passive components usually exhibit a very poor ability to withstand surge voltages. These surge voltages can be of different origins, and in most cases are transient surges. The recorded surge voltages even at low levels can lead to a damage of the mentioned power electronics devices or power converter components. Consequently, it is very important to implement a number of measures to increase the insulation level of the entire system. In this paper the two representative examples of insulation coordination are elaborated: i) an industrial AC drive and ii) photovoltaic inverter used in solar grid-connected power systems.

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