共用接地极对直流控制系统的影响研究

Influence of Common Grounding-pole on HVDC Transmission Control System

随着超高压/特高压直流输电工程的大规模建设,为节省工程用地,降低造价,共用接地极技术被普遍采用。然而,共用接地极技术的应用对直流控制系统是否存在影响、影响哪些方面及其影响程度等一系列问题均没有一个全面系统的研究。为此,依托溪洛渡直流工程设计参数,系统分析共用接地极运行对每一条直流输电工程控制系统的影响;并针对溪洛渡直流工程2回直流共建换流站的特点,特别分析共用接地极运行对2回直流协调控制的影响。结果表明,溪洛渡直流工程中共用接地极运行不会影响直流控制系统的正常运行。

With the large scale construction of EHVDC/UHVDC transmission projects, common grounding-pole design of nmlti-circuit systems has become the trend for its land-and cost-saving. However, the common grounding-pole technology has not been studied comprehensively and systematically in terms of its influence on DC control system, such as, whether or not it has influences on the eontrol system, how and in what extent if it has, etc. Therefore, based on the design parameters for Xiluodu HVDC project, the influences of the common grounding-pole on each circuit control system connected with the pole were analyzed systematically. Particularly, considering the situation that two circuits use a common converter substation together, its influences on the coordinative control between two circuits were studied. The results show that the influences of the common grounding-pole on Xiluodu HVDC transmission control system can be ignored.