Algorithm Research on Automatic Calculation of Large-Scale Interconnected Power System's Total Transfer Capability

Main problem restricting the automatic calculation of total transfer capability,namely the convergence property of power flow during power system transition process, is researched.In allusion to the network with weak convergence property a time-domain simulation based ill-conditioned power flow algorithm is proposed.From the viewpoint of time-domain simulation,the proposed algorithm turns a series of problems to solve nonlinear power flow equations into the time-domain simulation problem under smaller and slower perturbations to obtain steady-state operation point.Through the simulation computation based on the data of nation-wide interconnected power grid the availability of the proposed method is verified. On this basis,the detailed design of the algorithm for automatic calculation of total transfer capability of large-scale interconnected power grid is performed.Combining with the calculation process of total transfer capability by actual power grid dispatching department,in which the transient stability constraints are taken into account,the implementation of the proposed algorithm in Power System Analysis Software Package(PSASP) is completed.