scholarly journals Forecasting the Reliability of Components Subjected to Harmonics Generated by Power Electronic Converters

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1266
Author(s):  
Giovanni Mazzanti ◽  
Bassel Diban ◽  
Elio Chiodo ◽  
Pasquale De Falco ◽  
Luigi Pio Di Noia
Keyword(s):  
Power Systems ◽  
Low Voltage ◽  
International Standards ◽  
Time To Failure ◽  
Reliability Model ◽  
Power Electronic ◽  
Power Electronic Converters ◽  
Current Harmonics ◽  
Component Design ◽  
Voltage Harmonics

This paper aims at refining an experimentally based reliability model for the insulation of power components subjected to the randomly varying harmonics generated by power electronic converters. Compared to previous papers of the same authors and to the existing literature, here the model is re-formulated from the theoretical viewpoint focusing on the foremost role played by low percentiles of time to failure—in particular by the 1st percentile—selected as the rated life in the framework of modern probabilistic design of components. This is not only more correct from the viewpoint of component design, but also on the safe side as for the reliability of devices. Moreover, the application of the model is broadened to treat the whole sequence of odd voltage harmonics from the 5th to the 25th, i.e., those taken as the most significant in power systems according to international standards. The limits to voltage distortion set in Standard EN50160 are the reference for establishing parametrically a series of typical distorted voltage waveshape analyzed in the applicative part, which account for the possible phase-shift angles between voltage harmonics. The effect of current harmonics is also considered, from both the theoretical and applicative viewpoint. As a last, but not least novelty, the reliability model is used here for life and reliability estimates not only of Medium Voltage (MV)/Low Voltage (LV) capacitors and cables—already studied in the previous stages of this investigation—but also of induction motors and transformers in the presence of harmonics from power converters.

Design and Applications of Controllable Magnetic Devices in Power Electronic Circuits and Power Systems

2021 ◽  
Vol 1 (2) ◽  
pp. 6-14
Author(s):  
Peter Zacharias ◽  
Keyword(s):  
Power Systems ◽  
Power Electronics ◽  
Power Electronic ◽  
Electronic Circuits ◽  
Power Electronic Converters ◽  
Passive Components ◽  
Magnetic Devices ◽  
Magnetic Components ◽  
Power Electronic Circuits ◽  
Overload Capacity

Magnetic components are characterized by high robustness and reliability. Controllable magnetic components, which used to dominate, have been out of fashion for about 50 years. However, they have great advantages in terms of longevity, radiation resistance and overload capacity and become smaller and smaller with increasing operating frequency. This makes them interesting in modern power electronics applications with the increasing use of WGB semiconductors. The article shows how the performance of power electronic converters can be improved with modern power electronics and with field-controlled magnetic components using modern magnetic materials. Keywords: Magnetic components; Passive components; Modelling; Magnetic amplifiers; Controllable filters;

Improving the power factor correction in the presence of harmonics by reducing the effect of resonance and harmonics

2016 ◽  
Vol 3 (2) ◽  
pp. 282
Author(s):  
Saber M. Saleh ◽  
Mohamed E. Arafa
Keyword(s):  
Power Systems ◽  
Power Factor ◽  
Electrical Networks ◽  
Current Harmonics ◽  
In Series ◽  
Filter Type ◽  
Protective Relays ◽  
Tuning Frequency ◽  
Power Factor Improvement ◽  
Voltage Harmonics

Harmonics in electrical networks occur as a result of non-linear loads.  It has an effect on power factor improvement using capacitors in terms of increasing the unbalance current between units. In addition, the occurrence of resonance and result in the exit of capacitors from service by the protective relays to protect the units from collapse. The main objective of this research is the real-time study of improving the power factor with reducing the effect of the resonance and harmonics on the power system. This reduction can be done using filters, consist of reactors and capacitors connected in series or in parallel or series and parallel together to reduce the current harmonics or voltage harmonics. Single Tuned filter type (passive filter) is used which presents very low impedance at the tuning frequency, through which all current of that particular frequency will be diverted. This research presents two practical power systems 11kV source in Fayoum substation and 13.8kV source in New Badr substation connected to power factor Improvement circuit. These models simulated by Matlab at different unbalance currents and harmonics. Also, it presents the design of the series reactor and the harmonics filter which satisfy the minimum effect of resonance and harmonics.

scholarly journals Energy Efficiency of LVDC Supplies Including PV Sources

2021 ◽  
Vol 15 ◽  
pp. 46-53
Author(s):  
Anis Ammous ◽  
Abdulrahman Alahdal ◽  
Kaiçar Ammous
Keyword(s):  
Energy Source ◽  
Renewable Energy Source ◽  
Energy Efficiency ◽  
Renewable Energy ◽  
Low Voltage ◽  
Power Source ◽  
Power Electronic ◽  
Power Electronic Converters ◽  
Pv Systems ◽  
High System

The Low Voltage Direct Current (LVDC) system concept has been growing in the recent times due to its characteristics and advantages like renewable energy source compatibility, more straightforward integration with storage utilities through power electronic converters and distributed loads. This paper presents the energy efficiency performances of a proposed LVDC supply concept and others classical PV chains architectures. A PV source was considered in the studied nanogrids. The notion of Relative Saved Energy (RSE) was introduced to compare the studied PV systems energy performances. The obtained results revealed that the employment of the LVDC chain supply concept is very interesting and the use of DC loads as an alternative to AC loads, when a PV power is generated locally, is more efficient. The installed PV power source in the building should be well sized regarding to the consumed power in order to register a high system RSE.

scholarly journals Comparative Analysis of Series & Parallel Passive Filter Using PSCAD Simulation

10.29007/jr21 ◽  
2018 ◽  
Author(s):  
Ronak Jayswal ◽  
Swapnil Marathe ◽  
Manank Shastri ◽  
Kiran Panchal
Keyword(s):  
Final Section ◽  
Detailed Comparison ◽  
Power Electronic ◽  
Electronic Components ◽  
Power Sector ◽  
Distant Future ◽  
Current Harmonics ◽  
Passive Filters ◽  
Final Verdict ◽  
Voltage Harmonics

Harmonic filters will become an inevitable equipment in power system in not too distant future, given the alarming power quality degradation due to the current harmonics and voltage harmonics; keeping this as a datum scenario, rise of filters will be followed in coming years. In this paper, essential data demonstrating the swelling use of power electronic components into various fields, viz. industrial and power sector side are initially discussed. Several studies have been illustrated for the mitigation of industrial bound harmonics (produced due to non-linear loads) with key focus inclining towards passive filters. Passive shunt and passive series topologies have been analyzed. According to the results derived from the analysis and the detailed comparison of the topologies discussed, final verdict has been provided based on various economic oriented parameters such as cost effectiveness, size, power consumed, initial spikes, THD and more are covered in the final section of the paper.

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