A novel STATCOM control scheme for the coordination with OLTC on voltage regulation

Author(s): San-Yi Leea*, Yung-Sung Chuangb, Jun-Wei Laia
a Department of Electrical Engineering, Taipei Chengshih University of Science and Technology, Beitou, Taipei 11202, Taiwan
b Department of Electrical Engineering, Minghsin University of Science and Technology, Xinfeng, Hsinchu 30401, Taiwan
International Journal of Smart Grid and Clean Energy, vol. 3, no. 2, April 2014: pp. 161-167
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.3.2.161-167

Abstract: When an static synchronous compensator (STATCOM) is installed with an on-load tap-changer (OLTC), in general, a coordinated voltage control scheme, where the STATCOM responses for transient voltage variation and the OLTC for long-term voltage variation, is required to reserve the operating margin of STATCOM for emergency conditions, and reduce the operating losses. In this paper, an independent control scheme for the voltage regulation of STATCOM is proposed. The proposed control scheme is based on the feedback of processed line voltages to the reference voltage input of STATCOM to reduce the compensation output when the terminal voltage is in its steady state, but still can provide high compensation output when there is an abnormal low voltage contingency in the upstream. It’s shown that the proposed STATCOM control scheme can coordinate well with OLTC in all simulated scenarios.

Keywords: Voltage regulation, static synchronous compensator, on-load tap-changer

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