特高压与超高压交流输电能力及经济比较研究

Study on comparison of transmission capability and economy between UHV AC and EHV AC

自我国交流特高压工程规划和建设以来,国内对特高压交流输电的输电能力、经济性、实施效果等方面存在较大的争议。本文通过建立特高压交流与超高压交流点对网和网对网的输电系统仿真模型,采用理论分析和仿真计算相结合的技术手段,针对不同输电距离和系统强度情况,从热稳极限、暂稳极限角度对比分析了特高压交流与超高压交流输电线路的送电能力,并以送受端同样系统强度下相同输电距离输送同等容量电力为例,对比分析了特高压交流输电与超高压交流输电的经济性,从而研究特高压与超高压交流输电在输电能力和经济性方面的优劣。研究表明,在相同的输电距离情况下,特高压交流的最大输电能力是超高压交流输电的2~4倍;相同输电容量下中短距离输电时,超高压交流输电经济性优于交流特高压输电。

Since the planning and con struction of the UHV AC tran smission project in Chin a , there h a s been con siderable controversyover the tran smission capacity , economy , and implementation effects of UHV AC tran smission. This p aper establishes a tran smission power system simulation model for UHV AC and UHV AC point-to-grid and grid -to-grid tran smisimulation calculations to combine technical mean s , according to the different tran smission distance and supply capacity of UHV AC and UHVAC tran smission lines is analyzed from the therma l stability limit and the temangle ,taking the same tran smission distance under the same system strength for sending end and receiving end as the example , thetran smission capacity of tlie same capacity is tak en as an example , the economy of UHV AC tran smission and UHV AC tran smission is compared and an alyzed , so as to study the advantages and disadvan tages of UHV and UHV AC tran smission in terms of tran smission capacity and economy. Research shows that the maximum tran smission capacity of UHVAC tran smission is 2 ; 4 times of EHVAC tran smission under the same tran smission distance , and EHV AC tran smission is superior to UHV AC tran smission in the same tran smission capacity with medium and short range tran smission.