This month’s Featured Technical Paper is from the Proceedings of the 2018 International Conference of Doble Clients. The paper is titled: New Advancements in Power Flow Regulating Tap-Changer Control Systems for Phase-Shifting Transformer
This paper describes new developments in power flow regulating tap-changer control systems for phase- shifting transformers (PSTs). These transformers are also called phase angle regulating (PAR) transformers because they control the phase angle across a networked transmission system branch circuit to control the power flowing through it. PSTs regulate the phase angle by inserting a quadrature voltage into each phase by action of a tap-changer mechanism.
This paper discusses advancements in the control technology for use with two 400 MVA PSTs recently installed in parallel in the San Diego Gas & Electric (SDG&E) 230 kV transmission system. It summarizes the further development of the control technology over many projects executed over more than ten years and the further development of the control capabilities to meet the requirements specified by the California Independent System Operator (CAISO) and SDG&E for automatically controlling these parallel PSTs.
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