Adaptive evaluation method and system for transient voltage stability of power system

Abstract

The invention provides an adaptive evaluation method and system for transient voltage stability of a power system. The method comprises the steps: obtaining a time sequence track of each time step after a fault in real time when the power system breaks down; calculating the distance between the time sequence track of each time step and the multi-dimensional shaplet corresponding to the time step; and outputting a transient voltage stability evaluation result of the power system corresponding to the time step based on a comparison result of the distance and the splitting point corresponding to the time step, wherein the multi-dimensional shaplet and the split point are obtained after training is carried out based on time sequence track sample data and a predetermined stable state label. Through the embodiment of the invention, transient voltage stability evaluation can be adaptively carried out, the method adapts to the actual acquisition condition of time sequence track data after the fault, an evaluation result can be given in real time, the state of the current power system can be accurately and timely judged, and the method has interpretability.

Description

Technical field [0001] The present invention relates to the field of stabilization analysis assessment of power systems, and more particularly to a power system transient voltage stable adaptive assessment method and system. Background technique [0002] With the rapid growth of the load in the electricity system, the proportion of dynamic loads such as the power market, the proportion of dynamic loads such as induction motors is constantly increasing, and transient voltage installment has become a serious threat in heavy-duty receiving regions. Transient voltage instability or crash may lead to large power failure accidents, resulting in a large amount of economic losses and serious social impacts. Therefore, it is important to determine that the transient voltage stability of the power system is of great significance to prevention of voltage distortion and even a large power outage. At present, the engineering judgment based on fixed thresholds is widely used in the project, an...

AI Technical Summary

Problems solved by technology

The first method is time-consuming and cannot meet the early and rapid requirements of transient voltage stability assessment, and this method requires accurate modeling of the actual power grid, but it is actually difficult to obtain accurate power system load parameters

The second theoretical method can only be applied to small systems, and it is difficult to apply to actual complex large systems. Therefore, more research focuses on the third method

However, current methods for transient voltage stability assessment using machine learning / data mining lack interpretability, do not consider the spatial correlation among variables, and do not balance the accuracy and rapidity of transient voltage stability assessment

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