Power Balance and Power Factors of Distorted Electrical Systems and Variable Speed Asynchronous Electric Drives
In this study, power quality coefficients that determine the distortion of electrical systems are established. The power factor is chosen as a universal criterion for electromagnetic and electro-energetic compatibility of distorted sources and distorting loads. Mathematical expressions are obtained...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-07-01
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| Series: | Electronics |
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| Online Access: | https://www.mdpi.com/2079-9292/10/14/1676 |
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| author | Viktor Petrushyn Vasiliy Horoshko Juriy Plotkin Nurgul Almuratova Zhanar Toigozhinova |
| author_facet | Viktor Petrushyn Vasiliy Horoshko Juriy Plotkin Nurgul Almuratova Zhanar Toigozhinova |
| author_sort | Viktor Petrushyn |
| collection | DOAJ |
| description | In this study, power quality coefficients that determine the distortion of electrical systems are established. The power factor is chosen as a universal criterion for electromagnetic and electro-energetic compatibility of distorted sources and distorting loads. Mathematical expressions are obtained for its calculation in various cases of electrical systems distortion. As an application example, power balances and power factors of a variable frequency asynchronous drive system are considered. The criterion: the power factor not only determines the energy and electromagnetic compatibility of the drive with power supply, but it also evaluates drive efficiency. Experimental studies were carried out under usage of inexpensive, commonly used measuring devices both on the grid side of the frequency converter and on the asynchronous motor side. The studied coefficients were determined in two ways: measuring instruments and analysis of oscillograms. The second method for determining the above coefficients from oscillograms of currents and voltages also requires finding the total harmonic distortion (THD) of currents and voltages for the corresponding load adjusting points. The similarity of the obtained results shows that both of these methods can be applied. According to the operating mode of the load, the criterion is calculated as an average range in a certain range of speed control, or it is determined by considering a given tachogram of speed changes. The results of experimental studies confirm the correctness of the theoretical provisions. |
| first_indexed | 2024-03-10T09:41:07Z |
| format | Article |
| id | doaj.art-66c16c550eb24b6db1fa7ba0ee096386 |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-03-10T09:41:07Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-66c16c550eb24b6db1fa7ba0ee0963862023-11-22T03:38:19ZengMDPI AGElectronics2079-92922021-07-011014167610.3390/electronics10141676Power Balance and Power Factors of Distorted Electrical Systems and Variable Speed Asynchronous Electric DrivesViktor Petrushyn0Vasiliy Horoshko1Juriy Plotkin2Nurgul Almuratova3Zhanar Toigozhinova4Electrical Machines Department, Odessa National Polytechnic University, 65044 Odessa, UkraineElectrical Machines Department, Odessa National Polytechnic University, 65044 Odessa, UkraineDepartment of Cooperative Studies, Berlin School of Economics and Law, 10315 Berlin, GermanyElectrical Machines and Electric Drive Department, Almaty University of Power Engineering and Telecommunications, Almaty 050013, KazakhstanTelecommunications and Innovative Technologies Department, Almaty University of Power Engineering and Telecommunications, Almaty 050013, KazakhstanIn this study, power quality coefficients that determine the distortion of electrical systems are established. The power factor is chosen as a universal criterion for electromagnetic and electro-energetic compatibility of distorted sources and distorting loads. Mathematical expressions are obtained for its calculation in various cases of electrical systems distortion. As an application example, power balances and power factors of a variable frequency asynchronous drive system are considered. The criterion: the power factor not only determines the energy and electromagnetic compatibility of the drive with power supply, but it also evaluates drive efficiency. Experimental studies were carried out under usage of inexpensive, commonly used measuring devices both on the grid side of the frequency converter and on the asynchronous motor side. The studied coefficients were determined in two ways: measuring instruments and analysis of oscillograms. The second method for determining the above coefficients from oscillograms of currents and voltages also requires finding the total harmonic distortion (THD) of currents and voltages for the corresponding load adjusting points. The similarity of the obtained results shows that both of these methods can be applied. According to the operating mode of the load, the criterion is calculated as an average range in a certain range of speed control, or it is determined by considering a given tachogram of speed changes. The results of experimental studies confirm the correctness of the theoretical provisions.https://www.mdpi.com/2079-9292/10/14/1676distorted electrical systempower quality indicatorspower factorelectromagnetic compatibilityenergy compatibilityvariable speed asynchronous electric drive |
| spellingShingle | Viktor Petrushyn Vasiliy Horoshko Juriy Plotkin Nurgul Almuratova Zhanar Toigozhinova Power Balance and Power Factors of Distorted Electrical Systems and Variable Speed Asynchronous Electric Drives Electronics distorted electrical system power quality indicators power factor electromagnetic compatibility energy compatibility variable speed asynchronous electric drive |
| title | Power Balance and Power Factors of Distorted Electrical Systems and Variable Speed Asynchronous Electric Drives |
| title_full | Power Balance and Power Factors of Distorted Electrical Systems and Variable Speed Asynchronous Electric Drives |
| title_fullStr | Power Balance and Power Factors of Distorted Electrical Systems and Variable Speed Asynchronous Electric Drives |
| title_full_unstemmed | Power Balance and Power Factors of Distorted Electrical Systems and Variable Speed Asynchronous Electric Drives |
| title_short | Power Balance and Power Factors of Distorted Electrical Systems and Variable Speed Asynchronous Electric Drives |
| title_sort | power balance and power factors of distorted electrical systems and variable speed asynchronous electric drives |
| topic | distorted electrical system power quality indicators power factor electromagnetic compatibility energy compatibility variable speed asynchronous electric drive |
| url | https://www.mdpi.com/2079-9292/10/14/1676 |
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