远距离高压输电及其在三峡工程应用的探讨

Long-Distance HV Transmission and Its Application in TGP

我国能源和负荷分布不均，远距离高压输电是解决这一矛盾的最优越的方法。远距离输电有高压直流和交流两种方式。从经济上分析，二者间有一个“等价距离”，超过此距离，直流输电较为经济。三峡电站向华中及川东输电距离在600km以内，采用交流500kV输电较为经济，向华东送电采用500kV直流和1050kV交流混合方式是可行的。采用1015kV线路交流输电能力可代替4～5回500kV交流输电线路，减少铁塔用材1／3，节约导线1／2，节省造价10％～15％，线路损耗减少50％。

The long-distance high voltage (HV) transmission will be the best way to solve non -uniform distribution in energy resource and power load. in view of economy, there exists ' an equivalent distancen between HV DC transmission and HV AC transmission. It may be more economic for the electricity transmission in 500 kv from the Three Gorges Project to Center China and the east part of Sichun province within 600 km. But 5oo kv and 1, 050 kv HV DC transmission lines may be practicable for electricity transmission to East China. The 1, 150 kv lines may be substituted for the 4 -5 -circuit 500 kv lines, reducing steel material for the steel towers by 1/3, wires by 1/2, cost saving by 10%- 15% and line loss by 50%.