Analysis on Phase Arrangement and Transposition Modes for UHV DC and Double-circuit EHV AC Transmission Line Built on the Same Tower

作     者：SIMA Wenxia ZHOU Yuan YUAN Tao YANG Qing SUN Shujie Gilles Tremouille 

作者机构：State Key Laboratory of Power Transmission Equipment &System Security and New Technology Chongqing University Chongqing 400030China ALSTOM Grid Technology Center Shanghai 201114 China 

出 版 物：《高电压技术》 (High Voltage Engineering)

年 卷 期：2012年第38卷第12期

页      面：3133-3139页

核心收录：

学科分类：080802[工学-电力系统及其自动化] 0808[工学-电气工程] 08[工学] 

基　　金：Project supported by Funds for Innovative Research Groups of China (51021005)  National Basic Research Program of China (973 Program) (2009CB724504)  National Natural Science Foundation of China(50707036) 

主　　题：500千伏输电线路 特高压直流 换位方式 同塔双回 交流 直流换流变压器 双回路 交直流混合 

摘      要：For AC and DC hybrid transmission lines, the arrangement and transposition modes of AC conductors not only affect the unbalance factor of AC lines, but also influence the bias current of DC converter transformers by AC and DC coupling. Excessive bias current will influence the normal operation of converter transformers, thus the optimal AC phase arrangement and transposition mode of hybrid lines was studied to minimize the coupling effect between AC and DC lines to fit the requirements on both aspects. Based on the parameters of the Ximeng-Shanghai project in China, a detailed simulation model of the DC converter station and the hybrid transmission line with double-circuit AC 500 kV transmission lines and DC ± 800 kV transmission lines were presented in the software PSCAD-EMTDC, and the coupling effects of the hybrid transmission lines were elucidated. The fundamental frequency components of DC poles with different operation conditions, arrangements of conductors and operation modes were analyzed,and the effective arrangement and transposition limiting the fundamental frequency current component of the DC line were compared. Simulation results show that AC operating conditions can affect DC induced components while the DC system operation mode has no apparent effect. With compact arrangement and inconsistent transposition of AC lines, the fundamental frequency component on DC lines can be reduced effectively; the three-transposed mode within the hybrid line is the optimal layout scheme, considering both the requirements of DC bias current and AC unbalance degree.