高压直流输电技术的发展及其在电网中的应用

Development of HV DC Transmission Technique and Its Application in Power Networks

直流输电技术自１８８２年问世以来，经历了汞弧阀、可控硅阀和微处理器２个高速发展时期，现已广泛应用在长距离架空输电和电缆输电。直流输电具有损耗小、纹波小、灵活性好、可靠性高，可实现不同频率网互联等特点。就南方电网而言，为有效防止全网大停电，建议将云南与贵州两电网建成一个同步电网，广东、广西建成另一个同步电网，云贵电网与两广电网再用３回或２回直流联网。

Since DC transmission technique came out in 1882, it has went through 2 high speed developing stages, i. e. mer- cury arc valve, controlled sillcon valve and microprocessor, which have been widely used in long distance overhead transmission and cable transmission. The DC transmission technique is characterized by little loss, small wave, good flexibility, high reliability and realization of inter-connection of networks at different frequencies. In the view of the southern power network it is recom- mended to construct Yunnan and Guizhou two networks into a synchronized power network to effectively prevent the whole net- work from the large power outage. And Guangdong and Guangxi two networks will be constructed into another synchronized net- work, while Yunnan-Guizhou network and Guangdong-Guangxi network will be inter-connected with 3-circuit or 2-cir- cuit DC lines.