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Open AccessArticle

Improved Reactive Current Detection Method of SVG

College of Geophysics and Information Engineering, China University of Petroleum-Beijing, Beijing 100000, China
School of Automation, Wuhan University of Technology, Wuhan 430000, China
Author to whom correspondence should be addressed.
Energies 2017, 10(9), 1374;
Received: 18 July 2017 / Revised: 26 August 2017 / Accepted: 5 September 2017 / Published: 10 September 2017
PDF [3917 KB, uploaded 13 September 2017]


The static VAR generator (SVG) is an important device in flexible AC transmission systems (FACTS) for the development of smart grids. Based on the basis principle of SVG and instantaneous reactive power theory, the conventional ip–iq and dq methods have a certain error when the three phase voltages are unbalanced. In this paper, the current detection algorithm is improved in cases of three-phase power asymmetry by using the fundamental positive-sequence reactive current instead of the voltage as the input of phase locked loop (PLL). So the problems caused by unbalanced three-phase voltages could be avoided. In addition, a moving average filter is designed to improve the performance of the detection accuracy and dynamic response. Experiments verify the correctness and effectiveness of the proposed scheme. View Full-Text
Keywords: static VAR generator; instantaneous reactive current detection; phase locked loop; moving average filter static VAR generator; instantaneous reactive current detection; phase locked loop; moving average filter

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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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Wei, X.; Zhu, G.; Lu, J.; Li, W.; Qi, A.E. Improved Reactive Current Detection Method of SVG. Energies 2017, 10, 1374.

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