Branch coefficient calculation method based on real-time data of power grid

A technology of branching coefficient and real-time data, which is applied to electrical components, circuit devices, emergency protection circuit devices, etc., can solve problems that do not involve the calculation method of branching coefficient based on real-time data of the power grid, and achieve easy programming and simple mathematical calculation process , the effect of clear principle

Inactive Publication Date: 2013-03-13
STATE GRID SICHUAN ELECTRIC POWER +2
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However, none of the current published literature involves the calculation...

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  • Branch coefficient calculation method based on real-time data of power grid

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[0027] The implementation process of the present invention will be described in detail below in conjunction with the accompanying drawings,

[0028] Such as figure 1 As shown, the present invention provides a branch coefficient calculation method based on grid real-time data, comprising the following steps:

[0029] (1) Obtain real-time data of power grid

[0030] Obtain the grid online model and real-time measurement data from the EMS, obtain the real-time operation mode of the grid through state estimation, or directly obtain the data after state estimation from the EMS. EMS exports grid model data by outputting CIM (Common Information Model, Common Information Model) / XML (Extensible Markup Language, Extensible Markup Language) files that comply with the IEC 61970 standard, and outputs measurement data and state estimation result data in accordance with the Easy Language specification.

[0031] (2) Obtain the zero-sequence parameters of the grid components

[0032] Obtain...

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Abstract

The invention discloses a branch coefficient calculation method based on a real-time data of a power grid. The method comprises the steps of: obtaining an online mode and real-time measurement data of the power grid from an EMS (energy management system); obtaining a real-time operation mode of the power grid by state estimation, or directly obtaining state estimation data from the EMS; obtaining a zero-sequence parameter of each power grid element from relay protection setting value setting software, and associating the zero-sequence parameter of the power grid into the online model data of the power grid through a name matching table; setting a fault position and a fault type; obtaining current vectors of a lower-level branch and an upper-level branch by short-circuit current calculation; and taking a mode value of the ratio of the current vector of the lower-level branch and the current vector of the upper-level branch, or taking the ratio of an amplitude of the current vector of the lower-level branch and the amplitude of the current vector of the upper-level branch, so as to obtain the branch coefficient based on the real-time data of the power grid. By adopting the method, the branch coefficient calculation method is simple in calculation process, and is suitable for setting and checking a protection setting value.

Description

technical field [0001] The invention belongs to the field of electric power system relay protection, and more specifically, the invention relates to a method for calculating branch coefficients required for setting and checking of electric power system relay protection fixed values. Background technique [0002] The selectivity of relay protection means that when the protection device operates, it disconnects the fault from the power system in the smallest possible interval, so as to ensure that the fault-free part of the system can still continue to operate safely. Selectivity includes two meanings: One is that the fault should only be removed by the protection device installed on the faulty component, and the other is that the protection device of the adjacent component should act as a backup protection for the faulty component. Therefore, there is a cooperative relationship between the upper and lower levels of protection. [0003] The introduction of the branch coeffici...

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Application Information

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IPC IPC(8): H02H3/00
Inventor 陈军毕兆东庞晓艳夏彦辉杨向飞俞秋阳郑中王新宝沈其瑜张玉琼杨华
Owner STATE GRID SICHUAN ELECTRIC POWER
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