Improved Reactive Current Detection Method of SVG

Xueliang Wei, Guorong Zhu, Jianghua Lu, Wenjing Li and And Erjie Qi
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Xueliang Wei: College of Geophysics and Information Engineering, China University of Petroleum-Beijing, Beijing 100000, China
Guorong Zhu: School of Automation, Wuhan University of Technology, Wuhan 430000, China
Jianghua Lu: School of Automation, Wuhan University of Technology, Wuhan 430000, China
Wenjing Li: School of Automation, Wuhan University of Technology, Wuhan 430000, China
And Erjie Qi: School of Automation, Wuhan University of Technology, Wuhan 430000, China

Energies, 2017, vol. 10, issue 9, 1-11

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 i p –i q 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.

Keywords: static VAR generator; instantaneous reactive current detection; phase locked loop; moving average filter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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