Validity Evaluation Of Model And Paramters In Power System Dynamic Simulation

The grid becomes more and more large and complex with the national economy develops quickly.One side the scope of the grid is larger than before as the result of the grids are interconneted, the other side new types of equipments are put into operation continually with technological progress. Only the staff of the grid company must learn about the dynamic character of grid accuratly that the grid can run safely, this must resort to the dynamic simulation. So to guarantee the reliability degree of the dynamic simulation result is critical to the safety and economy of the grid operation..The best way to improve the reliability of simulation result is to improve the validity of the model and its parameters used in dynamic simulation. In the paper the problems of how to set up the system of evaluating the validity of model and its paramters and how to evaluate the reliability of the prior simulation result are analyzed following the order that post simulation validation, validity evaluation of model and its parameters, reliability evaluation of prior simulation. The main creative achievements are shown as following:Accuracy assessment of posterior simulation is the base of all work. The current assessment methods are mainly to assess the curve from the numerical similarity aspects and ignore the dynamic aspects. From the two sides of the curve data values and shape to compare the similarity of the time series, so evalating the result of post dynamic simulation is more reasonable.Based on the criterion and landmark dividing method the shape similarity of the measured data and the simulation results is compared, also the difference of each time intervals is also considered.When evaluating accuracy of the system simulation, the physical data of critical nodes, voltage, angle, active power, reactive power are compared generally.Due to the large number of system components, it is time-consuming to validate the entire components model. Based on the detailed investigation, the model is analysed from the perfect degree of modeling theory and the reliability of the way by which the parameters can be get. So the index value of validity of model and its parameters can be computed. By use of the measured data recorded when the power system is disturbed, the hybrid simulation can be run according to a model or a subnet, then the accuracy degree of post simualtion can be evaluated and the index value of validity of model and its paramters can be modified. According to the index of validity, the engineers can improve the speed of error traceability.All aim is to make a reasonable assessment of the credibility of a priori simulation and enhance credibility. By use of the index of validity of model and its paramters, the reliability degree of prior simulation result can be evaluated. During the disturbance, not all the equipments participate in the dynamic behavior of the system and the impact of each device on the dynamic behavior is different, so two factors, degree of model participation and degree of model importance, are considered during the evaluation. This makes the evaluation result more reasonable.:...