级联多端特高压直流作为多端高压直流输的典型串联接线形式，将具有良好的发展前景。基于级联多端特高压直流输电的典型接线方式及配置考虑，依据全寿命周期成本理论，通过级联多端双起点特高压直流与两端特高压直流技术经济性对比研究思路及算法分析，量化研究级联多端双起点与两端特高压直流方案经济性比选中的主要影响因素，为级联多端双起点方案拟定及选择提供参考。

As the typical series from of multiterminal DC(MTDC) transmission technology, cascade multiterminal UHVDC (CMTUHVDC) power transmission technology has good prospects for development. Base on the typical connection mode and configuration consideration of CMTUHVDC and according to the life cycle theory, the economic influence factors of CMTUHVDC and Twoterminal UHVDC selection are quantitatively analyzed, providing reference for CMTUHVDC selection.