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| Study on Filtering Mechanism and Operating Characteristic of the Controllably Inductive Power Filtering System |
| Liu Qianyi1, Li Yong1, Hu Sijia1, 2, Luo Longfu1, Cao Yijia1 |
1. National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China;
2. School of Information Technology and Electrical Engineering The University of Queensland Brisbane 4072 Australia |
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Abstract This paper presents a controllably inductive power filtering (CIPF) system with the novel filtering mechanism. Due to the zero-impedance design of the rectifier transformer, the harmonic magnetic flux between the secondary load winding and the additional filtering winding can be balanced each other. Hence, the flowing paths of the harmonic currents are shortened. The addition of the active filter contributes to the performance improvement with the task of harmonic isolation between the power grid and load. First, the three-phase unified equivalent circuit model and the mathematical model are provided at the harmonic domain. Based on the deduced transferring matrix, the evaluation criteria for the CIPF system are established, and filtering principle is revealed, as well. An advanced virtual impedance control strategy is designed to prevent the potential harmonic amplification. The relationship between the phase/magnitude of the virtual impedance and the filtering performance is discussed. A laboratory platform is established to validate the theoretical analysis.
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Received: 01 June 2017
Published: 27 July 2018
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2018, Vol. 33 
