Checking system for cooperative relationship between power plant excitation system and protection fixed value of generation-transformer group

A technology of excitation system and protection setting value, which is applied in the field of verification system for the coordination relationship between the excitation system of the power plant and the protection setting value of the generator-transformer group, which can solve the problems of insufficient data, error-prone, cumbersome calculations, etc., and achieve comprehensive data , ensure accuracy, and reduce calculation difficulty

Inactive Publication Date: 2017-08-04
DATANG BINZHOU POWER GENERATION CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In order to solve the cumbersome calculations, error-prone, few comparison points brought about by the traditional calibration method, and the data comparison brought by random data comparison is not comprehensive enough and not intuitive enough, a power plant excitation system is developed. Group protection fixed value coordination relationship checking system

Method used

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  • Checking system for cooperative relationship between power plant excitation system and protection fixed value of generation-transformer group
  • Checking system for cooperative relationship between power plant excitation system and protection fixed value of generation-transformer group
  • Checking system for cooperative relationship between power plant excitation system and protection fixed value of generation-transformer group

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Experimental program
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Embodiment approach

[0032] Main embodiments of the present invention are as follows:

[0033] a. Collect the internal parameter list of the automatic adjustment device of the excitation system, collect the protection setting calculation book of the generator-transformer group and the protection setting value list, and determine which excitation system limiting links are related to the generator-transformer group according to the parameters of the excitation system device and the contents of the protection setting value of the generator-transformer group The set value of the group protection needs to be calculated in coordination, and the models of the excitation system and the protection equipment of the generator-transformer group are verified according to the needs, and the technical specifications of the excitation system and the protection of the generator-transformer group are collected;

[0034] b. According to the content to be checked, from the technical specification of the excitation sys...

Embodiment 1

[0042] Example 1: Coordination of low excitation limit and loss of excitation protection setting:

[0043] The verification of the coordination relationship needs to verify the coordination relationship between the loss-of-excitation protection impedance circle criterion and the P-Q limit curve of the excitation regulator. Usually, the criterion given for the loss-of-excitation protection of the generator-transformer unit is calculated on the basis of the R-X measurement impedance circle plane at the generator end. , in order to compare the loss-of-magnetism impedance circle with the P-Q limit curve of the excitation regulator, the two must be transformed into a coordinate plane for analysis, and the loss-of-magnetism impedance circle is converted into a P-Q plane curve. For the failure of Datang Binzhou Power Generation Co., Ltd. The magnetic protection is characterized by a static circle, and the formula needs to be used: the coordinates of the center of the circle are , wit...

Embodiment 2

[0048] Example 2: Coordination of V / F limitation and overexcitation protection setting:

[0049] Generation method of V / F limit curve: we use the formula provided in the technical specification of the excitation device (T is the time coordinate of the V / F limit; M is the numerical coordinate of V / F, and the value of M is based on the user's needs. The denser the value is, the smoother the obtained curve will be);

[0050] Enter the above formula into the Excel table. According to the value of M, T will get a series of values, that is, the curve corresponding to the V / F limit can be obtained in Excel.

[0051] Similarly, using the same method, add the overexcitation setting to the chart of the curve drawn by "V / F Limit", generate curves in the same chart, and compare them with each other.

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Abstract

The invention belongs to a checking system for a cooperative relationship between a power plant excitation system and a protection fixed value of a generation-transformer group. The checking system is implemented as follows: an internal parameter list of an automatic adjusting device of an excitation system is collected and a generation-transformer group protection setting calculation sheet and a protection fixed value list are collected; a function computational formula corresponding to a checked content is inputted into an Excel table cell to form a longitudinal column; a right mouse button is clicked in a generated photo, an item of data selection is selected, an item of adding is selected in a window, and naming, X-axis series value selection, and a Y-axis series value selection are carried out; and photo curve generation is carried out. According to the checking system provided by the invention, tedious artificial calculation of an exponential function formula is taken over by Excel office software for calculation, so that data points more than those of the artificial calculation by several times can be compared, the data accuracy can be guaranteed, the compared data can be increased by multiple times, and the data become comprehensive.

Description

technical field [0001] The invention belongs to a power system calculation method in the power system and its automation, and relates to a system for checking the coordination relationship between the excitation system of a power plant and the protection fixed value of a generator-transformer group. Background technique [0002] As the power grid pays more and more attention to the excitation system, in the document "Twenty-five Key Requirements for Preventing Power Production Accidents" and the requirements of various risk assessment inspections, there are clear requirements for the restriction of the excitation system of the power plant and the power generation. In the calculation of relay protection setting, to check the coordination relationship between the excitation system of the power plant and the protection setting of the generator-transformer group, the contents that usually need to be checked are: low excitation of the excitation system Coordination relationship b...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06
Inventor 孙方家孔凡伟周家宇
Owner DATANG BINZHOU POWER GENERATION CO LTD
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