A Novel T-Connected Autotransformer-Based 18-Pulse AC–DC Converter for Harmonic Mitigation in Adjustable-Speed Induction-Motor Drives

2007 ◽  
Vol 54 (5) ◽  
pp. 2500-2511 ◽  
Author(s):  
B.. Singh ◽  
V.. Garg ◽  
G.. Bhuvaneswari
Keyword(s):  
Induction Motor ◽  
Motor Drives ◽  
Induction Motor Drives ◽  
Harmonic Mitigation ◽  
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. .

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