An Improved Variable-Frequency Drive Based on Current Tracking

Zhiwei He, Guangyan Zhou, Mingyu Gao

Abstract


Variable frequency devices are widely used in many power systems. A current tracking based VFD is proposed in this paper. The output current is firstly fed back and compared with a standard sine wave, the difference of them is then used for a PI regulator to control the PWM signal, so as to change the output current accordingly to make it approach the standard sine wave. Simulation and experiments results show that the current tracking VFD not only has a fast dynamic response, high current tracking precision, current limiting ability, but also has small distortion of the output sine wave current and low loss of the motor.

 

DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3508

 


Keywords


Current tracking; VFD; PWM; PI control

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The Indonesian Journal of Electrical Engineering and Computer Science (IJEECS)
p-ISSN: 2502-4752, e-ISSN: 2502-4760
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