Cascading trip-considered power grid operation state recognition method
A technology of chain tripping and power grid operation, which is applied in the field of power system to achieve high efficiency
Active Publication Date: 2016-11-02
FUJIAN UNIV OF TECH
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[0013] The main disadvantage of the existing technology is that for any initial fault, the current operating data of the power grid is not used to quickly identify whether the initial fault can trigger chain trips
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[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.
[0031] like figure 1 As shown, a power grid operation state recognition method considering chain tripping is used to use the operation data of the power grid to evaluate whether continuous tripping occurs in the power grid. The identification method, the goal of the identification method is, for an initial fault, after inputting the characteristic quantity representing the current operation level of the power grid, it can be judged whether the power grid will have a chain trip in this state, and it has high accuracy. The specific steps of the method are as follows:
[0032] Step 1, select the node injection power of the power grid as the characteristic input representing the operating state of the power grid;
[0033] Step 2, select the marked parameter of whether chain trip occurs in the power grid as the ...
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The invention discloses a cascading trip-considered power grid operation state recognition method. The node injection power of a power grid is adopted as the characteristic inputs of the operation state of the power grid. A variable for judging whether the cascading trip of the selected power grid occurs or not is adopted as an output. Based on the characteristic inputs and the output, the sample data format of the operation state of the power grid can be determined. Meanwhile, a cascading trip judgment model is formed according to the relay protection action behaviors of the power grid during the cascading trip process. After that, based on a sample data model and a cascading trip judgment model, the electrical capacity of a remaining system branch is calculated and sample data are constructed to form a classifier. By means of the classifier, whether the cascading trip of the power grid occurs or not is judged for a certain initial fault. According to the technical scheme of the invention, based on the mode recognition technology, after the qualified classifier is formed, no special load flow transfer calculation is carried out. Meanwhile, only the node injection power of a power grid, which represents the operation state of the power grid, is required to be input for judging whether the initial fault of the power grid occurs to cause the cascading trip of the power grid or not. Therefore, the method is higher in efficiency.
Description
technical field [0001] The invention relates to the field of power systems, in particular to a method for identifying the operating state of a power grid considering chain tripping. Background technique [0002] In today's world, large-scale grid interconnection is a major trend in the development of power systems. In the large power grid, on the one hand, energy can be used more efficiently and reasonably, but on the other hand, it also makes it more complicated to maintain the safe operation of the power system, because faults that occur in the large power grid often have a chain effect on each other, components Once the chain effect is amplified, causing a large-scale power outage, the loss is often very serious. In recent years, some major power outages around the world have demonstrated this point profoundly. Therefore, in recent years, the cascading tripping and cascading failures of the power grid have attracted the attention of many power workers. [0003] At prese...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 邓慧琼
Owner FUJIAN UNIV OF TECH