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Energies 2018, 11(9), 2407; https://doi.org/10.3390/en11092407

A Simplified Minimum DC-Link Voltage Control Strategy for Shunt Active Power Filters

1
School of Automation, Guangdong University of Technology, Guangzhou 510006, China
2
School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Received: 11 August 2018 / Revised: 3 September 2018 / Accepted: 5 September 2018 / Published: 12 September 2018
(This article belongs to the Special Issue Power Electronics 2018)
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Abstract

The active power filter (APF) is a popular electrical device to eliminate harmonics in power systems. The rational design and effective control of DC-link capacitor voltage are important for implementing APF functions. In this study, the influences from the DC-link voltage on the APF compensating current characteristic and compensation performance are analyzed, and the reason to maintain DC-link voltage at a minimum value is investigated. On this basis, a simplified minimum DC-link voltage control strategy for APF is proposed. Compared with the existing DC-link voltage control strategies, the minimum DC-link voltage value in proposed strategy is only determined by the grid voltage and modulation ratio, reducing the calculation burden and the implementation difficulty in application, avoiding the interference from external parameters on the compensation effect. Additionally, the reference DC-link voltage varies at different values according to the grid voltage and modulation ratio. A shunt APF prototype is established and the experimental results verify the correctness and effectiveness of the analysis and proposed strategy. View Full-Text
Keywords: active power filter; minimum DC-link voltage; compensating current characteristic; compensation performance; simplified DC-link voltage control strategy active power filter; minimum DC-link voltage; compensating current characteristic; compensation performance; simplified DC-link voltage control strategy
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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.; Wang, Y.; Chen, S.-Z.; Zhang, G.; Zhang, Y. A Simplified Minimum DC-Link Voltage Control Strategy for Shunt Active Power Filters. Energies 2018, 11, 2407.

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