Comparison of the characteristics of high-voltage frequency converters of the electric drives

2016 ◽  
Vol 3 (2) ◽  
pp. 50-60
Keyword(s):  
High Voltage ◽  
Electric Drives ◽  
Frequency Converters ◽  
Voltage Frequency

High-voltage autotransformer frequency converters for electric drives

2008 ◽  
Vol 79 (10) ◽  
pp. 539-541
Author(s):  
A. G. Ivanov ◽  
N. V. Donskoi ◽  
V. A. Matison ◽  
I. I. Ushakov
Keyword(s):  
High Voltage ◽  
Electric Drives ◽  
Frequency Converters

scholarly journals COMPARISON OF METHODS FOR COMPENSATION FOR DAMAGE TO H-CELLS IN HIGH-VOLTAGE CASCADE FREQUENCY CONVERTERS

2021 ◽  
Vol 3 (55) ◽  
pp. 24-31
Author(s):  
V. Busher ◽  
◽  
O. Glazeva ◽  
Du Xin ◽  
◽  
...  
Keyword(s):  
High Voltage ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Comparison Of Methods ◽  
Space Vector Pwm ◽  
Space Vector ◽  
Line Voltage ◽  
Third Harmonic ◽  
Frequency Converters ◽  
Voltage Frequency

Purpose. The aim of this work is to find a method of controlling high-voltage frequency converters that would provide the smallest voltage drop on the motor, the least loads and oscillation of electromagnetic torque in an accident modes, and evaluate the effectiveness of pulse width modulation (PWM) methods with the injection of third harmonic and space-vector PWM in emergency modes. Methodology. We have applied the mathematical simulation of the electric drive “High voltage frequency converter with cascaded H-bridges – High power asynchronous machine” in Matlab/SimPowerSystem software for comparison of four PWM types – Sinusoidal PWM (SPWM), Balanced sinusoidal PWM (BSPWM), Balanced PWM with injected third harmonic (THPWM) and Space Vector PWM (SVPWM). Results. The method of balancing the line voltage minimizes shock loads during the transition from normal to emergency mode due to such a shift of the zero point and rotation of the phase vectors, in which the amplitude of the line voltage decreases to the minimum possible value, the spatial position of linear vectors remains unchanged. The conditions of optimal injection of the 3rd harmonic are found, which increases the efficiency of power supply use by 7… 30 % in comparison with symmetric sinusoidal PWM. But in some accidents (6-4-4, 4-3-2, 3-2-2) the 3rd harmonic is not effective. The method of balancing the space vectors provides the same conditions and increases the utilization of power supplies by 15.6 %, regardless of the number of damaged modules, which increases the amplitude of the 1st harmonic in case of accidents by 10 ... 26 % compared with sinusoidal PWM. Comparison of methods of space vector PWM (SVPWM), balancing of phase-to-phase voltage with the injection of the 3rd harmonic (THPWM) with sinusoidal PWM shows that SVPWM is the best method at damage of one or two modules and during normal work of the converter (except for the 3-3-2 configuration), ie in the most common cases. Originality. For the first time, a comparison of all methods of pulse-width modulation in emergency modes and the optimal method for each type of accident for 3-6-stage frequency converters is indicated. Practical value of the work is to provide the necessary mathematical apparatus for calculating signals using BSPWM, THPWM and SVPWM in emergency modes. References 17, table 1, figures 6.

scholarly journals Optimal Control Method of High-Voltage Frequency Converters with Damaged Cells

2020 ◽  
Vol 985 ◽  
pp. 012021
Author(s):  
V Busher ◽  
O Chornyi ◽  
O Glazeva ◽  
V G Kuznetsov ◽  
V Tytiuk ◽  
...  
Keyword(s):  
Optimal Control ◽  
High Voltage ◽  
Control Method ◽  
Frequency Converters ◽  
Optimal Control Method ◽  
Voltage Frequency

Improving the control system of the wire laying unit of the thin drawing mill

2020 ◽  
pp. 71-75
Author(s):  
А.В. Белый
Keyword(s):  
Control System ◽  
Functional Diagram ◽  
Protection System ◽  
Electric Drives ◽  
Frequency Converters ◽  
Mode Of Operation ◽  
Reversal Mechanism ◽  
The Wire ◽  
Winding Wire ◽  
Drawing Mill

В статье приводится описание разработки усовершенствованной системы регулирования аппарата укладки проволоки на стане тонкого волочения. Модернизация системы регулирования направлена на устранение недопустимого режима работы стана, когда намотка проволоки на катушку осуществляется без ее равномерной укладки, вследствие выхода из строя механизма реверсирования укладчика. Разработана функциональная схема системы защиты от остановки укладчика в процессе намотки проволоки на катушку. Реализация данной схемы выполнена на базе существующих систем регулирования преобразователей частоты в электроприводах аппаратов намотки и укладки. Приведено описание работы защиты от остановки укладчика. The article describes the development of an improved system for regulating the apparatus for laying wire on a thin drawing mill. The modernization of the control system is aimed at eliminating the unacceptable mode of operation of the mill, when the wire is wound on a coil without evenly stacking it, due to failure of the stacker reversal mechanism. A functional diagram of the stacker stop protection system was developed during the process of winding wire onto a spool. The implementation of this scheme is based on existing systems for regulating frequency converters in electric drives of winding and stacking machines. The description of the operation of the protection against stopping the stacker is given.

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