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Energies 2017, 10(9), 1374; doi:10.3390/en10091374

Improved Reactive Current Detection Method of SVG

1
College of Geophysics and Information Engineering, China University of Petroleum-Beijing, Beijing 100000, China
2
School of Automation, Wuhan University of Technology, Wuhan 430000, China
*
Author to whom correspondence should be addressed.
Received: 18 July 2017 / Revised: 26 August 2017 / Accepted: 5 September 2017 / Published: 10 September 2017
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Abstract

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

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