西北与华北联网 ,西北与四川联网 ,两个联网工程作用和效益不同。黄河上游水电帮助华北调峰 ,低谷时华北向西北倒送 ,帮助华北填谷 ;黄河上游水电类似起华北抽水蓄能的作用。特枯水年 ,华北向西北倒送火电 ,增加西北保证电量 ,以补水电出力不足。西北与四川联网 ,大量吸收四川 Northwest and North China networking, Northwest and Sichuan networking, the role of the two networking projects and benefits are different. The upper reaches of the Yellow River hydropower to help North China peak, the trough North China sent back to the northwest, to help North China valley; the upper reaches of the Yellow River hydropower similar to the role of North China pumped storage. In the dry year, North China sent fire power to the northwest, increasing the power in the northwest to make up for water and electricity. Northwest and Sichuan networking, a large number of absorption of Sichuan