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Power grid line parameter on-line identification method considering state estimation large error points

A technology of state estimation and large error points, which is applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, measuring devices, etc., to achieve the effect of improving the pass rate and accuracy

Inactive Publication Date: 2014-10-08
STATE GRID CORP OF CHINA +2
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Problems solved by technology

How to effectively identify equipment with inaccurate parameters from massive power grid data, and improve the basic data quality and state estimation pass rate of dispatching automation has become a bottleneck problem that restricts the further improvement of the application level of dispatching technical support systems

Method used

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  • Power grid line parameter on-line identification method considering state estimation large error points
  • Power grid line parameter on-line identification method considering state estimation large error points
  • Power grid line parameter on-line identification method considering state estimation large error points

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Embodiment Construction

[0010] The online identification method of grid line parameters proposed by the present invention considering the large error point of state estimation is described in detail as follows in conjunction with the accompanying drawings and embodiments:

[0011] The online identification method of power grid line parameters considering the large error point of state estimation proposed by the present invention, its flow is as follows figure 1 As shown, the following steps are included: 1) Utilize the state estimation to calculate the state estimation value of the line measurement point, and obtain the deviation between the measurement data of the line measurement point and the state estimation value; measure the deviation greater than the set threshold A point is defined as a large measurement error point, and the line corresponding to the measurement point is set as a suspicious line; the specific implementation steps are as follows:

[0012] 11) Define the deviation Se between th...

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Abstract

The invention relates to a power grid line parameter on-line identification method considering state estimation large error points and belongs to the technical field of electric power system control. The method includes the steps that state estimation values of line measuring points are calculated through state estimation and deviation between measured values of the line measuring points and the state estimation values is obtained; the measuring points with the deviation larger than a set threshold value are defined as the large measuring error points and lines corresponding to the measuring points are set to be suspicious lines; whether data measured at the two ends of each line and data accumulated values measured through all devices of a bus connected with the line are balanced or not serves as a judgment basis, so that whether measuring data errors exist in each suspicious line or not is judged. In terms of the lines with the normal measuring data, according to the deviation between the measured values and the state estimation values, line parameters are gradually changed through a variable step size integral method, and the estimation values with the changed parameters are utilized; the parameters with the smallest deviation between the measured values and the estimation values are set to be estimation parameters of the lines. According to the method, line parameter estimation accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system control, and in particular relates to an online identification method of power grid line parameters considering large error points of state estimation. Background technique [0002] The online operation of the advanced application of "integrated regulation and control" of the smart grid dispatching technology support system has put forward higher and higher requirements for the basic data quality of the power grid operation. In order to further strengthen the management of basic data and improve the quality of basic data, each power grid company has incorporated the status estimation pass rate indicator into the peer-to-peer benchmarking assessment of the person in charge of the company in each province. In actual operation, there are many measurement data of the power grid, and the correctness of the power grid model, parameters and measurement jointly determine the operation index ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
CPCY02E60/00
Inventor 金学成王鹏汤磊邹根华郭玉金潘冬罗琦应忠德房金彦孙玥
Owner STATE GRID CORP OF CHINA
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