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Current-Limiting Soft Starting Method for a High-Voltage and High-Power Motor

1
School of Automation, Wuhan University of Technology, Wuhan 430070, China
2
Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
*
Author to whom correspondence should be addressed.
Energies 2019, 12(16), 3068; https://doi.org/10.3390/en12163068
Received: 17 July 2019 / Revised: 8 August 2019 / Accepted: 8 August 2019 / Published: 9 August 2019
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Abstract

Focusing on the starting problems of a high-voltage and high-power motor, such as large starting current, low power factor, waste of resources, and lack of harmonic control, this paper proposes a current-limiting soft starting method for a high-voltage and high-power motor. The method integrates functions like autotransformer voltage reduction–current limiting starting, magnetron voltage regulation–current limiting starting, and reactive power compensation during starting, and then the power filtering subsystem is turned on to filter out harmonics in power system as the starting process terminates. According to the current-limiting starting characteristic curve, the topological structure of the integrated device is established and then the functional logic switching strategy is put forward. Afterwards, the mechanisms of current-limiting starting, reactive compensation and dynamic harmonic filtering are analyzed, and the simulation and experimental evaluation are completed. In particular, the direct starting and the current-limiting are performed by developing a simulation system. In addition, a 10 kV/19,000 kW fan-loaded motor of a steel plant is chosen as the subject to verify the performance of the current-limiting soft starting method. As shown by the experimental results, the motor’s starting current is about 2 times that of its rated current, the power factor is raised to over 0.9 after the reactive power compensation, and the harmonic filter can effectively eliminate current harmonics and reduce the total harmonic distortion (THD) of supply currents. View Full-Text
Keywords: high-voltage and high-power motor; soft starting; reactive power compensation; harmonic filtering high-voltage and high-power motor; soft starting; reactive power compensation; harmonic filtering
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, Y.; Yin, K.; Yuan, Y.; Chen, J. Current-Limiting Soft Starting Method for a High-Voltage and High-Power Motor. Energies 2019, 12, 3068.

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