Review on Hybrid HVDC Technology for Integration of Offshore Wind Power Plant

VSC HVDC will be the most important approach for transmitting the power of large-scale offshore wind power plant in the near future. In recent literature, the feasibility of using hybrid type HVDC for offshore wind transmission has been discussed. A hybrid HVDC system has at one line commutated converter (LCC) at mainland and one voltage source converter (VSC) at offshore platform, which may inherit advantages of both LCC and VSC. It is possible to connect more VSCs at offshore platforms or LCC at onshore stations to the HVDC system to form a hybrid multiterminal system (MTDC). The purpose of this paper is to review the hybrid HVDC/MTDC technologies for offshore wind power plant connections reported in recent literature. Three types of hybrid HVDC topologies, i.e. VSC-LCC hybrid HVDC, VSC tapping LCC HVDC and hybrid CSC HVDC are presented. Based on the summary of the literature, the challenges of hybrid HVDC for offshore wind power plant integration are identified and further research works are proposed. KeywordsHVDC; Wind power plant; VSC; CSC