Line current harmonic reduction in adjustable-speed induction motor drives by harmonic current injection

2002 ◽  
Author(s):  
A.M.A. Amin
Keyword(s):  
Induction Motor ◽  
Motor Drives ◽  
Current Injection ◽  
Induction Motor Drives ◽  
Harmonic Current ◽  
Current Harmonic ◽  
Line Current ◽  
Harmonic Reduction ◽  
Adjustable Speed

scholarly journals Assessment of unsymmetrical voltage sag effects on AC adjustable speed drives

2009 ◽  
Vol 22 (3) ◽  
pp. 341-360
Author(s):  
Milutin Petronijevic ◽  
Nebojsa Mitrovic ◽  
Vojkan Kostic ◽  
Borislav Jeftenic
Keyword(s):  
Induction Motor ◽  
Control Algorithm ◽  
Motor Drives ◽  
Voltage Sag ◽  
Motor Drive ◽  
Voltage Sags ◽  
Induction Motor Drives ◽  
Adjustable Speed Drives ◽  
Adjustable Speed ◽  
Theoretical Results

This paper analyses the influence of unsymmetrical voltage sags on the increase of torque and speed deviation induction motor adjustable speed drives. The three following general types of induction motor drives control are analyzed: scalar controlled (V/Hz), rotor-field-oriented (RFO) and direct-torque-controlled(DTC). The analytical expression for variations of dc link voltage incorporated into the corresponding drive models and formulas for assessment of current/torque deviation are derived depending on the applied control algorithm. Afterwards, the presented theoretical results for the deterioration of motor drive performance due to voltage sags are validated experimentally. Measurements of sag-caused mechanical vibrations are used for the additional verification of the obtained results. .

Extended Delta Based 15-Phase AC-DC Converter for Variable Frequency Induction Motor Drives

2007 ◽  
Vol 8 (5) ◽  
Author(s):  
Vipin Garg ◽  
Bhim Singh ◽  
G. Bhuvaneswari
Keyword(s):  
Induction Motor ◽  
Motor Drives ◽  
Quality Indices ◽  
Induction Motor Drives ◽  
Harmonic Reduction ◽  
Point Of Common Coupling ◽  
Common Coupling ◽  
Multi Phase ◽  
Power Factor Improvement ◽  
Wide Operating

This paper presents the design and analysis of a multi-phase ac-dc converter system for harmonic reduction at the point of common coupling (PCC) in vector controlled induction motor drives (VCIMD's). The design of the proposed 3-phase to 15-phase autotransformer is presented along with the VCIMD. The proposed 15-phase ac-dc converter is found capable of suppressing up to the 29th harmonic in the supply current, along with the power factor improvement close to unity in the wide operating range of the drive. The effect of load variation on VCIMD is also studied to demonstrate the effectiveness of the proposed ac-dc converter. A set of power quality indices on input ac mains and on dc bus for a VCIMD fed from existing 6-pulse and proposed 15-phase ac-dc converters are also given to compare their performance.

A Tapped Star Connected Autotransformer Based 24-Pulse AC-DC Converter for Power Quality Improvement in Induction Motor Drives

2006 ◽  
Vol 7 (4) ◽  
Author(s):  
Vipin Garg ◽  
Bhim Singh ◽  
G Bhuvaneswari
Keyword(s):  
Induction Motor ◽  
Power Quality ◽  
Motor Drives ◽  
Quality Indices ◽  
Induction Motor Drives ◽  
Harmonic Reduction ◽  
Bridge Rectifier ◽  
Power Quality Improvement ◽  
Point Of Common Coupling ◽  
Phase Angles

This paper presents the design, analysis and development of a novel tapped star connected autotransformer based twenty-four-pulse ac-dc converter for improving power quality at the point of common coupling (PCC) in vector controlled induction motor drives (VCIMD’s). A star connected autotransformer with four windings per phase at different phase angles is used to realize the proposed twenty-four-pulse ac-dc converter. The basic design equations are derived to calculate the number of turns in different windings for achieving the harmonic reduction in the proposed autotransformer. The design of autotransformer is further modified for making it suitable for retrofit applications to replace presently used 6-pulse diode bridge rectifier. The proposed 24-pulse ac-dc converter is able to eliminate up to 21st harmonics in the supply current along with the power factor improvement close to unity in the wide operating range of the drive. The effect of load variation on VCIMD is also studied to demonstrate the effectiveness of the proposed ac-dc converter. Different power quality indices on input ac mains and on dc bus for a VCIMD fed from a 12-pulse and a 24-pulse ac-dc converters are also given to compare their performance. Various tests are conducted on the developed prototype of proposed autotransformer based 24-pulse ac-dc converter. Different power quality indices are measured on developed 24-pulse ac-dc converter to validate the design and simulation model.

Comparative study of unsymmetrical voltage sag effects on adjustable speed induction motor drives

2011 ◽  
Vol 5 (5) ◽  
pp. 432 ◽  
Author(s):  
M. Petronijević ◽  
B. Veselić ◽  
N. Mitrović ◽  
V. Kostić ◽  
B. Jeftenić
Keyword(s):  
Comparative Study ◽  
Induction Motor ◽  
Motor Drives ◽  
Voltage Sag ◽  
Induction Motor Drives ◽  
Adjustable Speed
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