With the development of economy and society

the problem of uneven interface power flow of partial provincial power grid in our country is becoming more prominent.The Jiangsu Power Grid is taken an example

the transmission trend from north to south is shown in general in the province due to reverse distribution of the power and the load in the territory.With the continuous access of new energy on a large scale and increase of scale of power from other territory

the existing power transmission ability from north to south in Jiangsu Province will not meet the need of further access of subsequent new energy.In this paper

the principle of Interline Power Flow Controller（IPFC）is described firstly.Then

the distribution feature of interface power flow of power transmission from north to south in Jiangsu Power Grid is analyzed.In view of the such problems as uneven distribution of power transmission channel from north to south and power transmission bottle neck

three kinds of interface power flow optimization schemes based on inter-line power flow controller are proposed and the verification result of interface power flow optimization is given by simulation.Finally

the idea of the project scheme on the application of inter-line power flow controller in Jiangsu Power Grid is given.It is concluded through analysis that installation of interline controller can improve the power transmission ability of interface from north to south

increase significantly renewable energy accommodation capacity of north and middle of Jiangsu and remarkable economic and social benefits.