Small-signal stability prediction and decision support method

Abstract

The invention relates to prediction and decision support method, in particular to a small-signal stability prediction and decision support method. In the invention, the case-based reasoning theory and the OAPID (Oscillatory Active Power Increment Distribution) calculation are creatively adopted, data is measured in real time based on a WAMS (Wide Area Measurement System), and small-signal stability prediction is realized according to the level of similarity between the existing case (especially the operating manner prior to oscillation corresponding to a frequent low-frequency oscillation event recorded by the WAMS) and the current operating manner. On the other hand, if the prediction results show that the weak damping mode exists in the current operating manner or low-frequency oscillation has been occurred, the small signal stability of the system is improved by scheduling according to the operating manner indicated by the case with higher level of matching similarity and the damping ratio meeting conditions by targeting at increasing the damping ratio of the corresponding mode (corresponding weak damping mode or low-frequency oscillation corresponding mode).

Description

technical field [0001] The invention relates to a prediction and auxiliary decision-making method, in particular to a small disturbance stability prediction and auxiliary decision-making method. Background technique [0002] With the continuous expansion of the scale of the power grid and the increasingly complex structure, the stability of the power grid has become increasingly prominent. Furthermore, with the continuous increase of load demand and the pursuit of operating efficiency and efficiency by power companies, the continuous increase of line transmission capacity is likely to cause small disturbance stability problems in the power system. The small disturbance stability problem of power system has become one of the main factors restricting the transmission capacity of transmission lines. [0003] As we all know, there are usually two forms of instability that may occur after a disturbance: ① due to insufficient synchronous torque, the generator rotor angle graduall...

AI Technical Summary

Problems solved by technology

[0006] The present invention mainly solves the problem in the prior art that each region in the whole network only has its own local online data and power grid model and parameters, and the data in each region is not completely transparent to each other, and the centralized management of online data in each region of the whole network exists. There are also technical problems such as technical difficulties; it provides a way to quickly evaluate the small disturbance stability of the system in the current operating mode by matching with the examples in the database, avoiding the online calculation of eigenvalues, and without knowing the accuracy of the system A Small Disturbance Stability Prediction and Auxiliary Decision-making Method Based on the Model and Parameters of

Images