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Adaptive Frequency-Based Reference Compensation Current Control Strategy of Shunt Active Power Filter for Unbalanced Nonlinear Loads

1
Department of Electrical Engineering, National Central University, Taoyuan 32001, Taiwan
2
Department of Mechatronics Engineering, National Changhua University of Education, Changhua 50074, Taiwan
3
Department of Computer Science and Information Engineering, Asia University, Taichung 41354, Taiwan
4
Metal Industries Research and Development Centre, Taichung 40768, Taiwan
*
Author to whom correspondence should be addressed.
Energies 2019, 12(16), 3080; https://doi.org/10.3390/en12163080
Received: 30 May 2019 / Revised: 30 July 2019 / Accepted: 5 August 2019 / Published: 9 August 2019
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Abstract

The shunt active power filter (SAPF) is an effective means for the modification of power quality. However, the compensation performance of SAPF would be deteriorated when the unbalanced nonlinear loads are present in the power system. To enhance the compensation performance of SAPF, the adaptive frequency-based reference compensation current control strategy is proposed in this paper. The proposed solution procedure can be divided into three stages including adaptive frequency detection, phase synchronization, and adaptive compensation. With the tracking of power system frequency, the phase synchronization for the SAPF compensation can be effectively modified under the power variation of unbalanced nonlinear loads. Based on the correct synchronization phase angle, the reference compensation current of SAPF can be accurately obtained with the adaptive linear neural network (ALNN) in the stage of adaptive compensation. In addition, the direct current (DC)-link voltage of SAPF can also be effectively regulated to maintain the compensation performance. To verify the effectiveness of the proposed adaptive frequency-based reference compensation current control strategy, the comprehensive case studies implemented with the hardware-in-the-loop (HIL) mechanism are performed to examine the compliance with the specification limits of IEEE Standard 519-2014. The experimental results reveal that the performance of proposed SAPF control strategy is superior to that of the traditional instantaneous reactive power compensation control technique (p-q method) and sliding discrete Fourier transform (DFT). View Full-Text
Keywords: adaptive frequency detection technique; reference compensation current control strategy; shunt active power filter (SAPF); power quality; IEEE Standard 519-2014; DC-link voltage; hardware-in-the-loop (HIL) adaptive frequency detection technique; reference compensation current control strategy; shunt active power filter (SAPF); power quality; IEEE Standard 519-2014; DC-link voltage; hardware-in-the-loop (HIL)
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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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Chen, C.-I.; Lan, C.-K.; Chen, Y.-C.; Chen, C.-H. Adaptive Frequency-Based Reference Compensation Current Control Strategy of Shunt Active Power Filter for Unbalanced Nonlinear Loads. Energies 2019, 12, 3080.

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