Critical evaluation of power system stability enhancement in the future GB transmission using an embedded HVDC link

Following the renewable obligation certification and carbon emissions reduction legislation as enforced by both the EU and UK governments, large volumes of wind generation will have a major impact on the future operation of the GB transmission system. As a result, there is a growing need for additional transmission capacity to accommodate future renewable generation and to ensure that transmission system security is maintained. This paper initially investigates the embedded HVDC link technology capability in stability enhancement using a range of control schemes. Next, a comparative study with regard to the effectiveness of a selection of supportive control actions to ensure system stability during the immediate post-fault period will be presented. These control actions consist of the set-point adoption of the embedded HVDC links that involve the fast ramp-up capability of the HVDC link, supplementary power oscillation damping control for the HVDC links, smart demand side control and conventional generation inter-trip schemes.