scholarly journals Effects of unsymmetrical voltage sags on industrial adjustable speed drives

2009 ◽  
Vol 6 (3) ◽  
pp. 495-505 ◽  
Author(s):  
Milutin Petronijevic ◽  
Nebojsa Mitrovic ◽  
Vojkan Kostic ◽  
Bojan Bankovic
Keyword(s):  
Control Algorithm ◽  
Torque Ripple ◽  
Performance Degradation ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Control Methods ◽  
Adjustable Speed Drives ◽  
Electric Drives ◽  
Adjustable Speed

This paper researches unsymmetrical voltage sag influence on torque ripple in scalar controlled (V/Hz), rotor field oriented (RFO) and direct torque controlled (DTC) drives. Electric drives performance degradation during voltage sag mainly depends on the used control algorithm. Industrial drives with all three types control methods are experimentally tested. Experiments with digital observer's application confirm the proposed solution. .

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. .

scholarly journals Voltage sag drop in speed minimization in modern adjustable speed drives

2006 ◽  
Vol 19 (2) ◽  
pp. 231-245 ◽  
Author(s):  
Milutin Petronijevic ◽  
Borislav Jeftenic ◽  
Nebojsa Mitrovic ◽  
Vojkan Kostic
Keyword(s):  
Numerical Simulation ◽  
Dynamic Performance ◽  
Analytic Calculation ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Adjustable Speed Drives ◽  
Field Weakening ◽  
Adjustable Speed ◽  
Flux Response ◽  
Recall Methods

This paper researches behavior of rotor field oriented (RFO) and direct torque controlled (DTC) drives in speed controlled application in voltage sags circumstances. Problems in application will be able to appear especially in work cases with speed and torque close to rated, even in a case when typical voltage tolerance curves show no drive trips. To overcome appeared drop in speed it was posed a field weakening algorithm during voltage sag. Analytic calculation and numerical simulation were presented in detail in this work. Knowing delay in RFO flux response and prompt DTC flux recall, methods for dynamic performance improving were advised.

Adjustable Speed Drives Response to Voltage Sags

2013 ◽  
Vol 367 ◽  
pp. 171-180 ◽  
Author(s):  
Surya Hardi ◽  
Muhd Hafizi Idris ◽  
Ismail Rohana
Keyword(s):  
Phase Angle ◽  
Type A ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Adjustable Speed Drives ◽  
Shift Behavior ◽  
Angle Shift ◽  
Dc Bus ◽  
Adjustable Speed ◽  
Tolerance Curve

This paper presents a study to investigate response of adjustable speed drives due to voltage sags. A small ASD of 0.39 kW, 50/60 Hz, and 400-480 V was used for testing how drives will respond to voltage sag types; A, B, C and D. The drive response is influenced by sag magnitude, sag duration and phase angle shift. Behavior of the diodes rectifier for conducting is influenced by sag magnitude and phase angle shift represented by sag of types C and D. The diodes rectifiers are reverse biased when it was supplied by voltage sags. Even though there are no charging currents to dc bus capacitor during voltage sags, the drives did not directly trip to certain sag magnitude and sag duration. Sensitivity of the ASD to voltage sag types is presented in voltage tolerance curve. Sag of type A produces highest sensitivity on the ASD and it trips for sag magnitude of 62.5% and 250 milliseconds in duration.

Impact of Input Voltage Sag and Unbalance on DC-Link Inductor and Capacitor Stress in Adjustable-Speed Drives

2008 ◽  
Vol 44 (6) ◽  
pp. 1825-1833 ◽  
Author(s):  
Kevin Lee ◽  
Thomas M. Jahns ◽  
Thomas A. Lipo ◽  
Giri Venkataramanan ◽  
William E. Berkopec
Keyword(s):  
Input Voltage ◽  
Voltage Sag ◽  
Adjustable Speed Drives ◽  
Adjustable Speed

scholarly journals Simulation of a Matrix Converter Fed Drive With Sliding Mode Control

10.14311/1620 ◽  
2012 ◽  
Vol 52 (5) ◽  
Author(s):  
Jan Bauer
Keyword(s):  
Sliding Mode Control ◽  
Control Algorithm ◽  
Power Converters ◽  
Sliding Mode ◽  
Induction Machine ◽  
Induction Machines ◽  
Matrix Converter ◽  
Control Methods ◽  
Electric Drives ◽  
Converter Topologies

Induction machines are among the most widely used electrical-to-mechanical converters in electric drives. Their advantageous robustness and simplicity goes hand-in-hand with complicated control. A converter with a suitable control algorithm is needed in order to withdraw maximum power and dynamics from the drive. In recent times, control methods such as those based on DTC and sliding mode methods have come to the forefront, due to their robustness and relative simplicity.In the field of power converters, new converter topologies are emerging with improved efficiency that pushes the operation limits of the drive. This paper focuses on the development of a control of this kind of strategy for an induction machine fed from a matrix converter.

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