A Method for Unsolvable Evaluation of Power Flow under Anticipated Faults for Static Safety Analysis

Abstract

The invention discloses a method for using static security analysis to assess flow insolubility of anticipated faults. The method for using the static security analysis to assess the flow insolubility of the anticipated faults includes: simulating a fault parameterization calculation model when flow of N-k anticipated faults which include faults of a single device or breaking faults of device groups are unsolvable by establishing the static security analysis, and solving unsolvable fracture surfaces of the fault flow based on an optimal multiple factor Newton method base principle, and finally obtaining a fault parameter result which represents the severity level of the flow insolubility and can be an assessment basis of the static security analysis for the severity level of the flow insolubility of the anticipated faults . The method for using the static security analysis to assess the flow insolubility of the anticipated faults calculates characteristic vector according to critical point jacobian matrix information, can provide sensitivity information to prevention and control, and remedies the defect that the flow insolubility of the severe anticipated faults can not be thoroughly analyzed and calculated, caused by the static security analysis.

Description

technical field [0001] The invention belongs to the field of power system power flow calculation, in particular to a power flow unsolvable evaluation method for static safety analysis under expected faults. Background technique [0002] With the further expansion of the grid scale, dispatchers cannot fully and accurately grasp the actual grid operation status through manual experience, and cannot directly adjust the grid operation. More effective advanced application software is needed to provide auxiliary information as an important reference for dispatchers. Through the study of major blackouts at home and abroad in recent years, it can be seen that most of them have gradually evolved from the destruction of static security constraints, especially for the sudden failure of equipment in the power grid, which leads to a large-scale shift of the system power flow, resulting in overloading of other components of the power grid. Continuous faults occur, eventually leading to ac...

AI Technical Summary

Problems solved by technology

However, all methods are implemented based on power flow calculation methods or improved power flow methods, so the results of power flow calculations become the key to static security analysis

At present, the power flow calculation technology can basically solve the problem of static safety analysis and predictive fault analysis and calculation, but in some extreme operation modes, equipment disconnection may cause power flow non-convergence. Such problems are only reminded by serious alarms in actual operation. , the deeper reasons for non-convergence have not been investigated, and the severity of the impact of such faults on grid stability has not been considered.

For the non-convergence of the power flow, which may be caused by numerical reasons or the power flow itself has no solution due to equipment disconnection, an effective method is needed to identify it. Therefore, there is a lack of analysis methods for serious faults in static security analysis.

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