A Screening Method for Serious Faults in Power System Transient Voltage Stability

Abstract

The invention relates to a power system transient voltage stability serious fault screening method, and belongs to the field of power system transient safety assessment and control. The method comprises: firstly, constructing an anticipated fault set, carrying out transient simulation on all faults in the anticipated fault set to obtain a voltage time sequence track under each fault in the anticipated fault set, and calculating to obtain a bus node transient voltage stability index of each 220kV and above voltage level under each fault; according to an index calculation result, obtaining severe faults to form a severe fault set, and establishing a cosine distance matrix of the severe fault set; and clustering the serious faults to obtain representative faults in each cluster, and finally obtaining a representative fault set. According to the invention, evaluation of the safety condition of the power system can be completed rapidly, effective fault prevention is carried out, and large-scale problems of the power system are prevented.

Description

technical field [0001] The invention belongs to the field of power system transient voltage safety evaluation and control, in particular to the field of serious fault screening of power system transient voltage stability. Background technique [0002] In recent years, with the development of high-voltage DC transmission, new energy power generation and other technologies, the dynamic reactive power reserve of the power system has become increasingly insufficient, and the problem of transient voltage stability caused by faults is particularly prominent. However, due to the large number of expected faults, if the reactive power optimization is directly aimed at all faults, the scale of the optimization problem will be too large, making it difficult to solve. Therefore, there is a need for an efficient way to reduce the number of failures that need to be considered. [0003] The existing fault screening methods mainly include time domain simulation method, transient energy fun...

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Problems solved by technology

Among them, the time domain simulation method has higher calculation accuracy, but it has defects such as long calculation time and cannot provide stability margin; the energy function method can provide stability margin and other information, and the calculation speed is faster, but it is difficult to obtain the critical energy The advantage of the artificial intelligence method is that the online calculation time of the trained neural network is very short, but this method has some common shortcomings, such as incomplete selection of feature variables, insufficient samples to cover the entire sample space, etc., resulting in poor screening accuracy. to guarantee

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