Converter for Voltage Source HVDC Links: Current Status and Future Challenges

Abstract

This article discusses the current state of DC HVDC technology. The article describes the history of DC HVDC technology, starting with its early development as a voltage source, and then discusses the introduction of line-cutting into current designs. The article discusses control and co-ordination of transformers, as well as the need for a DC breaker to facilitate control of multiple plants. Recent developments in the design of DC circuit breakers are discussed. The importance of reliability is recognized, especially in relation to cables, and the issues surrounding cable design are explained. Ongoing and planned installations of VHF-VHF DC installations are described.