N-2 combined fault quick sequencing method for transient stability analysis of electric power system

A technology of transient stability analysis and combined faults, applied in information technology support systems, electrical components, circuit devices, etc., can solve problems such as heavy workload and large number of N-2 faults, and achieve the effect of improving efficiency

Inactive Publication Date: 2010-03-17
STATE GRID ELECTRIC POWER RES INST +1
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Problems solved by technology

There are many components in the power system, and the number of N-2 faults in any combination is very large. If a detailed transient stability calculation and analysis is performed for each N-2 combined fault, the workload is huge

Method used

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  • N-2 combined fault quick sequencing method for transient stability analysis of electric power system

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Embodiment Construction

[0017] Attached below figure 1 , the method of the present invention is described in detail.

[0018] figure 1 Step 1 in the above describes the quantitative analysis of the transient stability of N-1 faults, that is, according to the operation mode of the power system and the corresponding models and parameters, the transient stability of the kth N-1 fault is calculated by using the EEAC method based on the time domain simulation trajectory. The state stability margin and the participation factor of each generator in the critical group, where k represents the sequence number of N-1 faults;

[0019] figure 1 Step 2 in the above describes the generation of the operation mode after the N-1 fault is cleared, that is, the N-1 fault element analyzed in step 1 is removed in the initial operation mode, and the operation mode after the N-1 fault is directly generated;

[0020] figure 1 In step 3, the calculation of the active power sensitivity of each generator in the transient st...

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Abstract

The invention belongs to the field of operation and control of electric power systems and provides an N-2 combined fault quick sequencing method for transient stability analysis of an electric power system, which is used for sequencing arbitrarily combined N-2 fault of an electric power system according to the severity of the transient stability. Based on the quantized evaluation information of the transient stability of the N-1 fault, the method calculates the severity index of the transient stability of the N-2 combined fault by combining the information of the power sensitivity of the powerchange of a second switching element on the transient stability critical generator group of the first fault element, thereby sequencing the N-2 combined fault set of the transient stability analysisof the electric power system. The method can be used for sequencing a large quantity of N-2 combine faults according to the severity of the transient stability when the operation mode, the model and the parameters of the power network are determined, so as to only calculate and analyze the transient stability of a small quantity of N-2 combined faults ranking at the front in detail and greatly enhance the efficiency of detailed calculation and analysis on transient stability of any N-2 combined fault.

Description

technical field [0001] The invention belongs to the field of power system operation and control. More specifically, the invention relates to a power system transient stability fault set sorting technology, which is suitable for sorting any combination of N-2 faults in the power system according to the severity of transient stability. Background technique [0002] An N-2 fault generally refers to a fault in which two elements are lost in the grid. There are many components in the power system, and the number of N-2 faults in any combination is very large. If a detailed transient stability calculation and analysis is performed for each N-2 combined fault, the workload is huge. For this reason, it is necessary to screen out the fault sets with relatively serious transient stability from any combination of N-2 fault sets, and then perform detailed transient stability calculation and analysis on the screened N-2 fault sets, which requires the N -2 combined failure sets for quick...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06F17/50
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 徐泰山薛禹胜李碧君鲍颜红方勇杰杨卫东许剑冰许立雄崔晓丹
Owner STATE GRID ELECTRIC POWER RES INST
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