Abstract
This study describes the initial development work and first-year challenges for the ANGLE-DC project; an innovative proposal to convert two existing AC circuits, from the island of Anglesey to the Welsh mainland, to operate as DC circuits. This project was proposed under the 2015 Network Innovation Competition organised by Ofgem. At present, there is a double-circuit 33 kV AC connection between the Llanfair-PG and Bangor substations. Each 3 km circuit consists of a short section of overhead line, with the majority of the circuit length being underground cable. The project will demonstrate the use of existing circuit assets operating under DC stress in a coastal location. The DC voltage will be ±27 kV, with a DC current rating of 556 A; providing a 23% increase in transmitted power capacity, from the existing operational limit of 24.8 MW to 30.5 MVA.
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