Analysis of the Dynamic Behavior of a Self-Commutated BTB System During Line Faults

• Published in: IEEE transactions on power electronics Vol. 25; no. 2; pp. 322 - 330
• Main Authors: Pham, P.V., Hagiwara, M., Akagi, H.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-02-2010; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Analog-digital conversion; Analysis; Applied sciences; Back-to-back (BTB) systems; Circuit faults; Circulating; circulating current; Computer simulation; Control systems; Convertors; Deviation; Direct current; Dynamical systems; Dynamics; Electric currents; Electric power; Electrical engineering. Electrical power engineering; Electrical machines; Electricity; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; Equations; Exact sciences and technology; Faults; Magnetic flux; Mathematical analysis; power flow control; Power quality; Regulation and control; Transformers; Transformers and inductors; Voltage control; Voltage fluctuations; voltage sags; Alternating current network; Electric transformer; Magnetic flux; Dynamic characteristic; Computer simulation; Theoretical study; Power system stability; Power electronics; Back-to-back (BTB) systems; Power flow control; voltage sags; Transportation network; Circulating current; Voltage stability; Converter; Voltage dip; Electric fault
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2009.2027325

This paper deals with a 50-MW self-commutated back-to-back (BTB) system intended for power-flow control between two ac transmission networks. It focuses on the dynamic behavior of the BTB system during single-line-to-ground and double-line-to-ground faults. Attention is particularly paid to the dc magnetic flux deviation in the grid and converter transformers, and the circulating current inside the grid transformers, which would produce undesirable effects on the system. Theoretical equations related to the amount of circulating current and the dc magnetic flux deviation are derived. The theoretical results developed in this paper are confirmed by computer simulation.