多端直流输电与直流电网技术

Multi-terminal HVDC and DC-grid Technology

基于常规直流及柔性直流的多端直流输电和直流电网技术是解决中国新能源并网和消纳问题的有效技术手段之一。从对直流输电发展的背景分析入手,概述了两端直流输电技术,深入探讨了多端直流输电和直流电网的基本概念,结合多端直流和直流电网的区别与联系及其各自的技术特点,指出了构建未来直流电网需要解决的关键技术问题、产生原因和国内外的研究进展,为中国直流电网技术的研究方向提出了思考和建议。

The multi-terminal high voltage direct current （HVDC） and DC grid technology based on the traditional HVDC and voltage sourced converter HVDC （VSC-HVDC） is one of the valid approaches which can resolve the problems of renewable energy integration in China. The background of the development of the DC transmission was analyzed and the two-terminal HVDC technology was overviewed in this paper. The basic concepts of the multi-terminal HVDC and DC grid were discussed. Combined the differences and relations between them, and their respective characteristics, the key technical issues to be resolved, cause of these problems and the research progress of building the DC grid in future were indicated, from which the thoughts and suggestions for the DC grid technology direction were put forward.