Power system transient voltage stability evaluation method based on voltage time sequence trajectory

Abstract

The present invention relates to a power system transient voltage stability evaluation method based on voltage time sequence trajectory, belonging to the field of power system stability analysis and evaluation. The method comprises: first simulating various faults of the power system in each operation mode to obtain a simulation sample set; extracting the voltage sub-time-sequence with the highest correlation with the category of the power system state from the voltage sequences of all the simulation samples as the standard voltage time sequence trajectory; calculating the distances from the trajectory to all simulated samples to form a standard distance dataset; using the standard voltage time sequence trajectory and the standard distance data set as input, and the state of the power system as output; training to obtain an SVM classification model; when the power system encounters a temporary state fault, obtaining the voltage time sequence in real time, calculating the distance between the standard voltage time sequence trajectory to the voltage time sequence; and inputting the support vector machine model and outputting the real-time power system state evaluation result by the model. The method of the invention can reliably monitor and evaluate the transient voltage stability of the power system on-line.

Description

technical field [0001] The invention relates to a power system transient voltage stability evaluation method based on a voltage sequence track, belonging to the field of power system stability analysis and evaluation. Background technique [0002] In recent years, voltage stability issues in power systems are receiving more and more attention. In the receiving area, the problem of transient voltage stability of the power system caused by insufficient local reactive power is particularly prominent. If the transient voltage stability in the receiving area cannot be reliably evaluated and timely control measures are taken, it is likely to cause large-scale disasters. Voltage collapse and blackout accidents. [0003] The monitoring and evaluation of transient voltage stability in actual power systems currently mainly use engineering criteria based on fixed voltage thresholds as standards at home and abroad, that is, when the node voltage in the system is lower than the set thre...

AI Technical Summary

Problems solved by technology

This kind of criterion is simple and easy to implement, but the setting of voltage threshold and time window depends more on the subjective experience of the system operator, or even just the past practice, and its accuracy, conservatism or optimism are difficult to estimate. It is extremely difficult to implement appropriate control measures as soon as possible in the follow-up

Images