现役交流配网XLPE电缆系统改直流运行的基础性方案设计研究

Basic Scheme Design of Existing XLPE Cables fromAC Distribution System to DC Operation

随着柔性直流输电技术的发展,将现役交流XLPE电缆线路改为直流运行以提升传输能力已成为全球关注的热点。以交流配网中典型的单/三芯XLPE电缆(110kV及以下)为例,从主接线形式选择、线芯回路配置、接地方式设计3个方面开展了单/双回路配电线路的直流改造方案设计研究,综合考虑投资成本、供电可靠性、传输容量、工程实用性等方面,系统分析了直流改造的可行性。研究结果可为现役交流配网改直流运行的实际工程应用提供重要参考。

Along with the development of VSC HVDC technology, it has become the focus of global attention to transform an existing XLPE cable line from AC operation into DC operation for uprating the transmission eapaeily. In this paper, the typical single and three core XLPE cables of 110 kV and below from AC distribution network are taken as the study object, and the DC transformation schemes for the single and double circuit distribution lines are discussed from three aspects, including the main wiring-connection form, loop-circuit configuration and grounding design. By combining the investment cost, system reliabilily, transmission eapaeily, engineering praetieabilily and etc. , the fea- sibilily of DC transformation is systematically analyzed. This research can be an important reference for the practical projects of DC transforming the existing AC cable distribution networks.