Close is the correlation between frequency regulation

peak load and tieline regulation in the interconnected power system. In the process of peak climbing

how to prevent the impact of the interconnected power system support on the tieline and solve the problem of AGC units lacking capacity is the key problem in the peak active dispatch. This paper builds a model for coordinating optimal dispatching of peak climbing for the interconnected power system. The units relating to tieline can be procured by an electrical dissection algorithm in the sending and receiving network at the first peak climbing stage. Then the regulating capacities of NONAGC units in the sending and receiving network are checked and NONAGC units are divided into two unit groups

the regulating capacity short and regulating capacity abundant group. In the process of peak climbing

firstly

the units relating to tieline is dispatched so as to maintain the scheduled power of tieline. Then various units in the sending and receiving network are coordinated at the same time

including the NONAGC units and AGC units

as well as the regulating capacity short and regulating capacity abundant unit groups. The case analysis demonstrates the feasibility of the model proposed.