Simple On-line Observation And
Compensation Of Dead-time Effects
Author(s)
S. M. Jung, C. B. Park, J. H. Kim, S. H. Lee & H. W. Kim
Abstract
Generally, there exist voltage differences between the voltage commands and the
output voltages of the three-phase pulse-width modulated (PWM) voltage-source
inverter (VSI), which are caused by the intended dead-time to prevent the armshort
of a leg and the nonlinearities of switching devices. These voltage
differences (or voltage distortion) affect the current distortion, torque pulsations,
and degradation of control performances. To overcome these drawbacks, a
simple and low-cost observation and compensation method of the voltage
distortion is proposed. The proposed method is employing model reference
adaptive system (MRAS) techniques and does not require any additional
hardware circuits such as voltage sensors. The voltage distortions caused by the
nonlinearities of the switching devices are estimated by a voltage distortion
observer which is based on the electrical model of the PMSM. And the estimated
voltage distortions are fed-forward to compensate the voltage commands. In
comparison with the previous existing methods, the proposed method has a
simple structure and good performances. Also, it can be implemented without
any extra devices such as voltage sensors and the computing effort is very small.
The execution of the algorithm can be easily embedded in the existing systems
without major modification. To show the effectiveness of the proposed method,
the experiments are carried out for the digitally controlled PMSM drive system.
The experimental results verify the validity of the proposed method and show
that the proposed method gives good performance and practical value.
Keywords: dead-time effects, voltage-source inverter, voltage distortion, MRAS.
Keywords
dead-time effects, voltage-source inverter, voltage distortion, MRAS.
Related Book
Other papers in this volume
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