Introduction of 500 kV Three Corges-Changzou Electric Power Transmission Project

To transmit electric power from ThreeGorges to East China, ±500 kV HVDC willbe adopted. The first transmission Iine will beconstructed from the Longquan (Yichang)Converter Station to the Zhengping(Changzhou) Inverter Station. This projectconnects the East China Power Network withthe Central China Power Network,coordinates the hydro and thermal electricpower, obtains the profit from timedifference and promotes the process of theinterconnection of the power networks of thewhole country.This paper gives the abstract of thesituation of the preliminary design, primaryresult and development tendency of the firstHVDC transmission project which transmitsthe electric power from Three Gorges to EastChina.

基于正序分量的多端输电线路精确故障定位研究

针对目前多端线路故障定位中分支接点附近测距死区较大的问题,提出一种基于正序分量的精确故障定位新方法。该方法不以数值范围作为故障判别依据,而是采用双端方程有解和无解两种对立状态实现故障支路的判别,从而有效减小分支接点附近测距死区的范围。在求解过程中,同时实现故障支路判别与故障测距,无需事先判别故障支路。新方法定位及测距结果不受故障类型、过渡阻抗及系统运行方式等的影响。PSCAD仿真结果,验证了所提算法的正确性、有效性和高精度性。