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As part of a programme of investment in relocatable reactive compensation in the UK, National Grid initiated a project to deliver a static var compensator (SVC) for its East Claydon substation in Buckinghamshire. The SVC includes a ± ± ± ±75Mvar STATCOM and is viewed as an important step towards long-term objectives intended to encourage new technologies with the potential to improve the efficiency and security of its system. This paper outlines the requirements for reactive compensation in the UK and the need for a SVC at East Claydon. The basic design of the SVC is described with particular focus on the STATCOM. The novel chain-circuit topology is used for the GTO-based STATCOM to provide a compact voltage-sourced convertor with low losses and the capability for single-phase operation to match prevailing system conditions. The commissioning of the STATCOM-based SVC is summarized with reference to site records of response tests and harmonic voltage measurements.

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The paper describes the project to refurbish the Konti-Skan HVDC Link between Sweden and Denmark, which included the replacement of the existing Pole 1, and the addition of top level bipole controls for both the refurbished Pole 1 and the existing Pole 2. The complex project included working in 2 different countries with 2 different client utilities, each requiring different scopes and with 2 contracts each with their own currencies. The project scope included up-rating the converters to match the already upgraded DC line and cable conductor circuit. The paper covers the drivers which prompted the need for refurbishment and how it was justified, and then present the details of the project implementation and the in-service performance.The paper also briefly covers previously completed refurbishment and upgrade work on other HVDC projects around the world and known plans to refurbish, replace or even relocate presently operating HVDC projects.