Method for sorting transient severe faults of power system

Abstract

The invention relates to a method for sorting transient severe faults of a power system. The method includes a first step of trend data and stable calculating data; a second step of generating a power grid model, a third step of analyzing ground state trend, a fourth step of initially forming predefined faults, a fifth step of determining and sorting at a post-fault balance point, a sixth step of determining and sorting inertia transient, a seventh step of determining and sorting post-inertia transient, an eighth step of determining and sorting an exit point, a ninth step of determining and sorting inertia transient of a minimal gradient point, a tenth step of determining and sorting post-inertia transient of the minimal gradient point, an eleventh step of determining and sorting the minimal gradient point, a twelfth step of determining and sorting faults under an unstable equilibrium point, and a thirteenth step of obtaining a related severe fault list. Content determination standards of different important nodes during a fault trajectory process are fully considered from aspects of the post-fault balance point, the exit point, the minimal gradient point and the related unstable equilibrium point through calculation, and reliability and accuracy of fault scanning are ensured.

Description

technical field [0001] The invention relates to the field of power system transient analysis, in particular to a method for screening serious faults in the transient state of the power system. Background technique [0002] In power system analysis, especially in safety analysis, fault scanning is a very important link. However, it is obviously unrealistic for the actual large-scale power grid to conduct safety and stability analysis on all faults in the pre-selected fault set. One feasible method is to sort and screen the faults after pre-scanning the faults, analyze the faults that are more serious or may cause the instability of the power system, and filter out a large number of non-serious faults. In the power system, with the occurrence of unpredictable accidents, whether the power system can withstand the transient process after the accident, and then transition to a new and stable state; this is the main content of power system safety analysis. It is the category of d...

AI Technical Summary

Problems solved by technology

[0005] The existing predictive fault analysis methods mainly use the direct method for transient fault analysis, without considering the stability of the post-inertia transient stage; and in practice, the multiple fault settings currently applied to the actual power grid are not considered, and the It simply considers the use of fault aggr...

Images