A New Method for Polynomial Coefficient Extraction Applied to Harmonic Distortion Calculation

2019 ◽  
Vol 9 (1) ◽  
pp. 389-395 ◽  
Author(s):  
A. Ortiz-Conde ◽  
F. J. Garcia-Sanchez ◽  
R Salazar
Keyword(s):  
Harmonic Distortion ◽  
New Method ◽  
Polynomial Coefficient

scholarly journals Voltage regulation and phase quantity increase of two high-power 12-phase rectifiers

2019 ◽  
Vol 10 (3) ◽  
pp. 1454
Author(s):  
Valery Safonov ◽  
Mikhail Dziuba
Keyword(s):  
High Power ◽  
Harmonic Distortion ◽  
Voltage Regulation ◽  
Total Harmonic Distortion ◽  
New Method ◽  
Matlab Simulink ◽  
Electromagnetic Processes ◽  
The Common

In this article, we present a new method of simultaneously increasing the phase quantity and regulating the rectified voltage for two 12-phase high-power rectifiers operating at a common load. Self-excited voltage inverters separately form the necessary voltages for voltage regulation and for increasing the phase quantity. The formed voltage is input with the help of a common booster transformer. Separating the inverters functions and using the common booster transformer makes it possible to reduce the installed power of the equipment significantly compared to similar circuits when the regulation range of the rectified voltage is up to 5%. Calculations show that the inverter power for increasing the phase quantity is about 3% of the rectifier power. The circuit was modeled in MatLab/Simulink and the electromagnetic processes in the rectifier were studied. The proposed method makes it possible to reduce the total harmonic distortion of the network current and the pulsation coefficient of the rectified voltage to the values typical for 24-phase rectifiers.

scholarly journals Novel switching technique for five leg inverter in dual motor control

2020 ◽  
Vol 19 (2) ◽  
pp. 644
Author(s):  
Jayaprakash Sabarad ◽  
G.H. Kulkarni
Keyword(s):  
Motor Control ◽  
Pulse Width Modulation ◽  
Induction Motors ◽  
Direct Torque Control ◽  
Harmonic Distortion ◽  
Torque Control ◽  
New Method ◽  
Voltage Source ◽  
Loop Control ◽  
Improved Performance

<p><span>This work presents a novel switching technique for five leg inverter in dual motor control. As the technology advances in industry, requirements in reducing the cost plays an important role with reliable product design. In conventional method, the six legs are used in 2- three phase Voltage Source Inverters (VSI) to control 2 motors. This proposed technique will give the improved performance of speed control for dual motor control using Five Leg Inverter (FLI). New proposed method suggests to use 5-inverter legs instead of 6-inverter legs to control 2 induction motors. New Switching technique proposed in FLI system is designed in effective way that improved performance and Total Harmonic Distortion of ~23% achieved. The load sharing on common leg is called Common Mode (CM) of operation. In this new method, closed loop control designed by using space vector pulse width modulation (SVPWM) and Direct Torque Control (DTC) in FLI Technology. With this new method smooth speed regulation is achieved when load torque is changed. THD% for CM-FLI is reduced when compared with convetional FLI technique. The new Switching technique is controlled in effective way that the common leg is not overloaded and able to drive both the induction motors independently at required speeds. Proposed switching technique verified at different operating speeds with No load and rated torque. Simulation results computed using MATLAB/SIMULINK Software. </span></p>

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