Vital interconnection commissioned

In July, ABB successfully commissioned an HVDC link for American Electric Power (AEP), which replaces an HVDC back-to-back converter station that was built in 1984. The converter station is an integral part of the Oklaunion HVDC transmission link and connects asynchronous grids in Texas and Oklahoma, both of which operate at 345 kV.
During the 22-month project, ABB’s scope included engineering, supply, installation and commissioning of an HVDC back-to-back transmission system capable of delivering 220 MW of power in either direction. Black-start capability enables fast restoration in the event of a power outage, allowing power to be imported from the other end of the link.

Key components of the turnkey solution include converter valves, converter trans­formers and ABB’s MACH 2 advanced control and protection system, which helps meet stringent system performance requirements.
“In addition to enhancing grid reliability and power stability, our HVDC solution enables efficient transmission of electricity across this important interconnection,” said Hanspeter Faessler, head of ABB’s Grid Systems business. “ABB’s domain expertise and global experience enabled us to deliver this link in 22 months, and to minimise out­age time for users, the converter station that was replaced remained in operation during construction.”

A similar back-to-back substation delivered by ABB

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