特高压直流换流站接入系统设计

Connecting system design for ultra high voltage direct current converter station

根据目前的规划,高压直流输电系统的电压等级已从±600 kV提高到特高压等级的±800 kV,输送容量也已从3600 MW提高达到5000 MW或6400 MW,这些对换流站的接入系统设计带来了前所未有的挑战。特高压直流的接入系统设计在电源的组织、换流站与交流系统的联系方式、电气主接线、换流站无功配置、稳定仿真及分析等方面都存在与常规±500 kV、±600 kV所不同的特点及困难。通过总结中国目前5回规划中的特高压直流接入系统设计,归纳了解决上述难题的创新技巧及方法,并对特高压直流的孤岛运行方式存在的问题及可能的解决措施进行了探讨。最后,指出了特高压直流换流站接入系统设计一些必须遵循的思路、原则及方法。相关研究结果可为同类工程参考。

Abstract： According to the present planning, the highest voltage level of high voltage direct current system has been reached to ±800 kV, and the maximum transmission capacity has been increased to 5000 or 6400MW, which is a great increase from the 3600MW of ±600 kV HVDC. All these bring unprecedented challenges to the connecting system design of the converter station. In many fields, such as the generation source arrangement, the connecting type between converter stations and AC system, main electrical diagram, reactive power arrangements , stability simulation and analysis ,the connecting design of UHVDC Converter Station, compared with that of the traditional ±500 kV or ±600 kV converter stations, has bear much difference and difficulty. By summering the connecting system designs of the 5 circuits of UHVDC systems which are being planned, the problems and the creative ideas and solution are presented. In addition, the islanded operation of UHVDC converter stations and its problems and solutions are also discussed in this paper, At last, the principles, methodologies and research results of the UHVDC converter station design are pointed out. Main results of this research can be applied to similiar UHVDC project.