Qualitative Analysis of the Circuits of Au-Tonomous Inverters  with Shut-off Valves

J.B. Toshov; A.T. Zheldikbayeva; Y. Sarsenbayev; K.K. Smagulova; Sh. Umarov; A. Pulatov; Y.K. Abdykenov

doi:10.31643/2028/6445.04

Authors

J.B. Toshov Islam Karim Tashkent State Technical University
A.T. Zheldikbayeva Abylkas Saginov Karaganda Technical University
Y. Sarsenbayev Satbayev University
K.K. Smagulova Abylkas Saginov Karaganda Technical University
Sh. Umarov Islam Karim Tashkent State Technical University
A. Pulatov Islam Karim Tashkent State Technical University
Y.K. Abdykenov Abylkas Saginov Karaganda Technical University

DOI:

https://doi.org/10.31643/2028/6445.04

Keywords:

autonomous current inverter, inductive load, valve frequency converter, variable-frequency electric drive, cut-off valves, commutation capacitor charge.

Abstract

The article presents the results of a qualitative analysis of circuits of autonomous current and voltage inverters with cut-off valves. The influence of the charge on the switching capacitor in parallel and series equivalent circuits on the restoration of the switching properties of the thyristors in the inverter power circuit is studied. It is shown that, due to the energy periodically accumulated in the inductive elements of the load, the voltage across the switching capacitor in the cut-off state is higher than in a conventional parallel autonomous current inverter. This ensures increased switching stability of the inverter. Consequently, the circuit of an autonomous current inverter with cut-off valves remains operational in valve converters for variable-frequency electric drives and maintains performance during sudden load surges and short circuits, since the voltage on the switching capacitor does not depend on the load voltage. Thus, the charge on the switching capacitor is preserved even when the load voltage drops sharply between thyristor commutations.

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Author Biographies

J.B. Toshov, Islam Karim Tashkent State Technical University

Doctor of Technical Sciences, Professor, Islam Karim Tashkent State Technical University, 100095, Almazar district, Universitetskaya street 2, Tashkent, Uzbekistan. ORCID ID: https://orcid.org/0000-0003-4278-1557

A.T. Zheldikbayeva, Abylkas Saginov Karaganda Technical University

PhD student of the Department of Automation of manufacturing processes, Abylkas Saginov Karaganda Technical University, 100027, Ave. Nursultan Nazarbayev, 56, Karaganda, Kazakhstan. ORCID ID: https://orcid.org/0009-0005-1325-5576

Y. Sarsenbayev, Satbayev University

PhD, Associate Professor, Head of Department of Power Engineering, Satbayev University, 050013, Satbayev str. 22, Almaty, Kazakhstan. ORCID ID: https://orcid.org/0000-0002-8887-1171

K.K. Smagulova, Abylkas Saginov Karaganda Technical University

Ph.D., Acting Associate Professor of the Department of Automation of manufacturing processes, Abylkas Saginov Karaganda Technical University, 100027, Ave. Nursultan Nazarbayev, 56, Karaganda, Kazakhstan. ORCID ID: https://orcid.org/0000-0001-6834-8490

Sh. Umarov, Islam Karim Tashkent State Technical University

Doctor of Technical Sciences, Professor of the department Electrical machines and drivers engineering, Islam Karim Tashkent State Technical University, 100095, Almazar district, Universitetskaya street 2, Tashkent, Uzbekistan. ORCID ID: https://orcid.org/0000-0002-9262-4683

A. Pulatov, Islam Karim Tashkent State Technical University

Ph.D., associated Professor, Head of the department Electrical machines and drivers engineering, Islam Karim Tashkent State Technical University, 100095, Almazar district, Universitetskaya street 2, Tashkent, Uzbekistan. ORCID ID: https://orcid.org/0000-0002-2641-571X

Y.K. Abdykenov, Abylkas Saginov Karaganda Technical University

PhD student of the Department of Automation of manufacturing processes, Abylkas Saginov Karaganda Technical University, 100027, Ave. Nursultan Nazarbayev, 56, Karaganda, Kazakhstan. ORCID ID: https://orcid.org/0009-0008-0095-576X

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