Journal
IEEE CANADIAN JOURNAL OF ELECTRICAL AND COMPUTER ENGINEERING
Volume 46, Issue 1, Pages 44-55Publisher
IEEE CANADA
DOI: 10.1109/ICJECE.2022.3228337
Keywords
Voltage control; Transformers; High-voltage techniques; HVDC transmission; Switches; Power conversion; Buck converters; Differential-mode transformer (DMT); high-voltage direct current (HVDC); interline dc power flow controller (IDCPFC); interline power flow controller (IPFC)
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The article presents an improved control scheme using an Interline DC Power Flow Controller (IDCPFC) to balance power flow in DC networks. The proposed system is scalable to higher voltages and powers, making it suitable for high-voltage DC transmission systems. A simulation and experimental prototype validate the effectiveness of the proposed method in controlling current flow between lines under unbalanced load conditions.
The power flow control in high-voltage direct current (HVDC) grids can be improved by employing the interline dc power flow controller (IDCPFC). This article presents an improved control scheme using IDCPFC to balance power flow in the dc networks. In this work, a differential-mode transformer (DMT) is used in combination with a bidirectional buck converter to form a variable DMT. In comparison to the existing methods, the proposed system is scalable to higher voltages and powers, which makes it suitable for high-voltage dc transmission systems. Analysis of a small-signal model of the proposed method and design of compensator for improvement of transient behavior is performed. A simulation is performed with independent feed-forward and feedback control to show the effectiveness of the proposed method. The proposed method is also validated through a 600-W experimental prototype. The experimental results show that the current flow between lines is controlled for unbalance load conditions.
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