An online setting method for power network backup protection based on incremental factor

Abstract

The invention relates to a method for online setting of power network backup protection according to increment factors. In the prior art, backup protection is poor in adaptability of fixed values, high in overall difficulty, low in overall efficiency and the like. According to the method for online setting of power network backup protection according to the increment factors, through the increment factor coefficient which is calculated in advance before the operation mode is changed, with the combination of operation mode variation information which is obtained in real time, the increment factors are generated, so that fault calculation is not needed by a setting system after the operation mode is changed. Namely, the branch coefficient of backup protection can be rapidly calculated, and therefore new protection fixed values can be calculated. By the adoption of the method for online setting of power network backup protection according to the increment factors, through adjustment, the setting quantity of backup protection can be changed, the contradiction of setting efficiency and the accuracy of the fixed values is eliminated, and the problems of setting insufficiency and setting surplus are solved. Due to the fact that when the operation mode is changed, simple four arithmetic operations are only conducted in the process of real-time setting and repeated and complicated fault calculation is not needed, the calculation speed is rapid, and calculation is stable.

Description

technical field [0001] The invention belongs to the field of electric power system relay protection, and in particular relates to an online setting method for electric power network backup protection. Background technique [0002] For backup protection based on single-ended electrical quantities, the protection range of its fixed value often depends on the structure and operation mode of the power grid. When the mode of operation changes, the scope of protection is reduced or exceeded. At present, the backup protection setting value is calculated off-line, that is, a certain range of operating modes is selected for calculation, and the resulting setting value is often not optimal in a certain specific mode. With the development of new energy technologies such as wind power and photovoltaics, the number and types of power sources have increased. At the same time, the scale of the power grid has also continued to increase, and the complexity of the operation mode has increase...

AI Technical Summary

Problems solved by technology

When the network scale is large, the fault analysis through the elimination and iteration of the admittance matrix will consume too much time and affect the online tuning speed

In addition, when applied to a large-scale complex ring network, due to the large number of primary and backup protection pairs to be determined, it is easy to appear the contradictory situation that some protection settings are insufficient and some protection settings are excessive.

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