知识与财富的链接
云广±800 kV直流输电工程是世界上第一条特高压直流输电工程。受端交流系统由于短路故障或负荷增加等原因,需要直流系统提供紧急功率支援时,将增加其输送容量,甚至会使直流系统过负荷运行。主要对换流阀的过负荷能力进行了研究,根据阀过负荷的机理,从阀中晶闸管结温和冷却系统冷却容量两个方面得到了阀过负荷能力的计算方法。并根据楚穗直流的具体数据进行了工程计算,计算结果表明该方法可以精确得到楚穗直流输电工程中阀的过负荷能力,可为实际直流输电工程的设计和运行提供参考和指导。
Yunnan-Guangdong ±800 kV DC transmission project is the first UHVDC transmission project in the world. The DC power transmission system must supply emergency power when the load increases or AC system malfunctions at the receiving end. It requires the DC power system to overload operating to increase its transmission capacity. This paper mainly studies the overload capability of the converter valve. It proposes a theory of calculating the overload capability based on the junction temperature and cooling capability of the valve cooling system. Moreover, with the specific data, it calculates and analyzes the overload capability of converter valve in Chuxiong-Suidong DC transmission project. The result indicates that this arithmetic can get the accurate overload capability of converter valve, which can provide reference and guidance to the design and operation of the practical HVDC transmission project.
