scholarly journals Electromagnetic compatibility of high-voltage frequency converters with power plant networks

2015 ◽  
Vol 2 (2) ◽  
pp. 22-29
Keyword(s):  
Power Plant ◽  
High Voltage ◽  
Electromagnetic Compatibility ◽  
Frequency Converters ◽  
Voltage Frequency

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

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 DESAIN SISTEM KONTROL PENGGERAK MULA GENERATOR MAGNET PERMANEN PLTMH MENGGUNAKAN PLANETERY GEAR

Kilat ◽  
2018 ◽  
Vol 7 (2) ◽  
pp. 149-159
Author(s):  
Rizki Pratama Putra ◽  
Samsurizal Samsurizal ◽  
Novi Gusti Pahiyanti
Keyword(s):  
Control System ◽  
Power Plant ◽  
Water Flow ◽  
Water Flow Rate ◽  
Planetary Gear ◽  
Hydro Power ◽  
Voltage Frequency ◽  
The Difference ◽  
Input Load ◽  
Changing Rate

Voltage and frequency stability of a micro hydro power plant requires a simple, reliable and efficient control system. This study aims to design a control system using planetary gear which is known to provide fast speed adjustments to respond to the changing rate of water flow. In this study the system design will be created using matlab simulink. The system will then be simulated with various turbine rotation conditions to see the reliability and stability of the frequency and voltage produced by the permanent magnet generator used in micro hydro power plant. The results obtained are the control system seems can stabilize the generator rotor rotation so that the resulting voltage frequency remains constant even though the input load and water flow rate are dynamic. From the simulation results it is also found that the efficiency of the control system is directly proportional to the difference in mechanical input and electric power output of the system.

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