Assessment of DC/DC converters for use in DC nodes for offshore grids

Abstract

With increasing offshore wind generation, there is a strong argument for implementing a multi-terminal DC grid offshore by the interconnection of individual HVDC links. The point of intersection of three or more lines can be used to interconnect projects with different voltage levels and to control power distribution. It is being proposed that these points, or nodes, be implemented using DC devices. A highvoltage, high-power DC/DC converter will therefore be an important component of a DC node. This paper reviews possible DC/DC converter topologies, looking at device requirement, different voltage conversion ratio and fault management. The suitability of the converters considered, for use in a node in a HVDC offshore grid, is discussed. A resonant DC/DC converter topology is considered in detail and is modelled at a conversion ratio of two, and demonstrates high power efficiency.

High-Frequency Operation of a DC/AC/DC System for HVDC Applications

“…These circuits however do not offer the galvanic isolation offered by a transformer which can be useful in some abnormal operating conditions and for separating grounding arrangements for different parts of a dc network. Furthermore, the well-established switch-mode dc/dc converters, typically employed for low-power applications, do not tend to scale very well for high-power applications [12], [13].…”