АЛГОРИТМ ПРОСТРАНСТВЕННО-ВЕКТОРНОЙ ШИМ С ГИБРИДНОЙ ПОСЛЕДОВАТЕЛЬНОСТЬЮ ПЕРЕКЛЮЧЕНИЙ ДЛЯ РЕГУЛИРУЕМЫХ ЭЛЕКТРОПРИВОДОВ ПЕРЕМЕННОГО ТОКА НА БАЗЕ ТРЕХУРОВНЕВОГО ИНВЕРТОРА НАПРЯЖЕНИЯ

A.N. Shishkov; M.M. Dudkin; V.K. Le; N.A. Eremin

doi:10.14529/power230404

Authors

A.N. Shishkov Moscow Polytechnic University
M.M. Dudkin South Ural State University
V.K. Le Moscow Polytechnic University
N.A. Eremin South Ural State University

DOI:

https://doi.org/10.14529/power230404

Keywords:

three-level neutral point clamped voltage source inverter, space-vector PWM, hybrid switching sequence, neutral point voltage, switching losses, asynchronous electric motor

Abstract

The article proposes a new space-vector PWM with a hybrid switching sequence for a three-level neutral point clamped voltage source inverter. Based on the advantages of the five-stage and seven-stage switching sequences, the hybrid sequence was developed with the aim of maintaining the neutral point voltage balance at a predetermined level and reducing the switching losses of power switches. The proposed algorithm allows for flexible adjustment of the level of achieving the specified criteria depending on the operating conditions of the system by changing the regulation coefficient. In the work, an approximated dependence is obtained that allows determining the optimal control coefficient for any values for any values of a given frequency at the input of the inverter when operating on an asynchronous short-circuited motor with a control law U/f = const. The effectiveness of this algorithm was confirmed by computer simulation using Matlab+Simulink. Experimental dependences of the spaces of the static state of the maximum voltage error of the neutral point and the number of pairs of switches of power switches depending on the specified frequency at the input of the inverter and the control coefficient of the hybrid sequence of switches are given. The results obtained showed that the proposed PWM algorithm with a hybrid switching sequence reduces the number of power switches by an average of 14,3%, while maintaining a neutral point voltage balance close to the seven-level sequence (deviation does not exceed 0,75%). Thus, the proposed algorithm is an effective tool for controlling a three-level voltage source inverter, which has a positive effect on its energy efficiency, size and weight characteristics, and operational reliability.

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Author Biographies

A.N. Shishkov, Moscow Polytechnic University

Cand. Sci. (Eng.), Ass. Prof., Head of the Department of Electrical Equipment and Industrial Electronics

M.M. Dudkin, South Ural State University

Dr. Sci. (Eng.), Prof. of the Department of Electric Drives, Mechatronics and Electromechanics

V.K. Le, Moscow Polytechnic University

Postgraduate Student of the Department of Electrical Equipment and Industrial Electronics

N.A. Eremin, South Ural State University

Master’s Student of the Department of Electric Drive, Mechatronics and Electromechanics

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