| The precise time-integration method is an absolutely stable display integration method, with the very good adaptation for stiff equation. Based on the alternating solution method, the method is applied to the power system transient stability calculation, and the analytical expression of the inverse matrix is derived by partitioning the inverse matrix. Thereby the danger of calculating stiff equations and the numerical instability that are brought by the solution of the inverse matrix is avoided. At the same time, the object-oriented and dynamic allocation of memory technology are used to respectively build classification to modularization for generator model, excitation model, the original motivation and governor. In the calculation process, generating matrix and inverse matrix dynamically has brought great convenience for modifying model parameters and replacing the types of the model. Take a provincial grid for calculation example, the simulation results show that this method has advantages of good numerical stability, programming simplicity and fast calculation, compared with that of the PSASP programs of the Electric Power Research Institute. And the method is also applied to the medium-term and long-term power system dynamics simulation .
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