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 aggregation to solve the problem, and does not substantially solve the problem of automatic screening and setting of multiple faults, but only single fault setting and analysis; it does not meet the requirements of the current scale development of the power grid, and the analysis of multiple faults is becoming more and more important. more attention

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