| A high-precision, high efficiency precise time-integration method based on multi-step prediction is presented and applied to power system transient stability calculation which has obtained good results. The power system transient stability calculation is one of the basic contents in power system analysis. The power system transient stability analysis method is the basis of the calculation and analysis of power system transient stability calculation, which is the assurance of the stability of the power system and prerequisites of emergency control and prevention control. The development of modern power grid structure and the construction of the power system meet higher requirements for power system transient stability analysis calculation, especially the real-time control and emergency control is more dependent on the constantly improving computational speed and accuracy.First, we establish the network equations of power system and generator model. Then we discuss the precise integration algorithm theory. And in accordance with the characteristics of the power system, the precise integration algorithm has been applied to the power system transient stability calculation. And then the power system differential equations have been separated into the linear part and nonlinear part. On the basis of previous studies, the efficiency and accuracy of transient stability calculation has definitely improved as the single-step linear fitting of the nonlinear part and the multi-step prediction polynomial fitting of the nonlinear part are used respectively. Finally, combined with the two ways of fitting makes a significant decrease in the number of solving the network equations and which way of fitting is used is according to the actual nonlinear term trends in each integration step. The result of the New England numerical examples substantiates the availability adequately. |
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