水电送端特高压直流换流站无功配置优化研究

Study on Reactive Power Compensation and Optimal Configuration of UHVDC Converter Station at Hydropower Sending-end

中国地域广阔且一次能源分布不均衡,水电通过特高压直流远距离送电至负荷中心是解决西南地区水电富余和减少弃水的重要途径。所述工程为建设在水电富集地区的±800kV特高压直流换流站,额定送电容量高达10 GW,初期换流站短路容量和短路比较小,随着配套大型水电投产,远期又存在短路电流超标等问题。换流站的无功配置需保证在初期和远期均满足相关规程和安全运行需要,同时要考虑站址场地限制问题。针对上述问题,采用远近结合、统筹考虑的方法,对换流站无功配置优化等方面进行了深入研究,总结出了具有一定参考价值的成果。

China is vast in areas and has unbalanced distribution of primary energy. The hydroelectric power should be sent to load center through long - distance UHVDC transmission, and it is the important way to solve the rich hydroelectric power and reduce water discharge. The described project is a ± 800 kV UHVDC converter station at hydropower sending - end in South-west China. The rated transmission capacity is up to 10 GW. In the initial stage the short - circuit capacity at AC side is inad-equate and after the large - scale hydropower station being put into operation ？ the short - circuit current will exceed the stand-ard. It must be ensured that the relevant procedures and safe operation in the short term and long term are both fulfilled. The site restriction should also be considered. Aiming at the above issues, intensive studies are carried out in areas of reactive power compensation and optimal configuration by using the method of combination of far and near ？ overall considerations. The results of a certain reference value are summarized.