摘要：综述了在±750~±800 kV 范围的特高压级别直流输电（UHVDC）方案的基本设计要求。作为参考，UHVDC的额定功率选为5 000 MW，输电距离定在2 000 km，并给出了直流线路电阻为18? W、功率为5 000 MW方案的主要标称设计值。只要在大型设备运输能力上不受限制，通常宁可使用每极单12脉动换流单元（方案1），并认为这是最为优化的组合。在要求每极大功率的情形，要考虑每极双12脉动换流单元（方案2），才能使换流变压器的规模重量尺寸减小到易于处置切实可行。对两种方案在基本设计各方面进行了比较。
关键词：特高压直流输电系统；可靠性和可用率；UHVDC基本设计数据；换流变压器
Basic design aspects of UHVDC transmission system
Hartmut Huang, Velpanur Ramaswami
Abstract: Some basic design aspects of an UHVDC scheme at UHV level (±750~±800 kV) are summarized. As reference the power rating of an UHVDC system is selected to be 5 000 MW and the transmission length is assumed to be 2 000 km, and the nominal main data are given for a 5 000 MW scheme assuming the DC line resistance of 18 W. The conventional and the most optimized configuration of using one 12 pulse group per pole（Scheme 1） is preferred as long as there are no constraints from transport capabilities of large equipment. In case of high amount of power per pole, two twelve pulse groups per pole （Scheme 2）is considered as necessary to reduce the size of the converter transformer to a manageable value. The two schemes are compared in the basic design aspects.
Keywords: UHVDC transmission system; reliability and availability; UHVDC basic design data; converter transformer
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