Power grid parameter error and bad data coordinated identification and estimation method

Abstract

The invention discloses a power grid parameter error and bad data coordinated identification and estimation method relating to a calculating method of power grid parameter accuracy. The conventional parameter error identification and estimation technology is low in efficiency and accuracy. The method provided by the invention comprises the following steps: 1) read-in of a power grid model and a plurality of measurement sections; 2) one-by-one state estimation of the measurement sections; 3) suspicious parameter and measurement detection; when the related measurement total error is smaller than the threshold value, the parameters or the measurement can be trusted; when the related measurement total error is greater than the threshold value, the parameters or the measurement can be suspicious, and can be filed in the suspicious parameter / measurement set; 4)parameter / measurement error coordinated identification based on multi-section and total error reduction index; when the suspicious parameter / measurement total error reduction index is greater than 9, the data are the error parameters or the bad data; 5) multi-section combined parameter estimation. The power grid parameter error and bad data coordinated identification and estimation method is advantageous in that the measurement redundancy, the value stability, and the calculating efficiency can be improved, and the parameter error identification and estimation accuracy can be improved.

Description

technical field [0001] The invention relates to a calculation method for the accuracy of grid parameters, in particular to a collaborative identification and estimation method for grid parameter errors and bad data. Background technique [0002] Large power grid operating state perception (state estimation) is the technical basis for power grid risk assessment, fault diagnosis and dispatching decision-making. In recent years, the basic automation level of my country's power grid has been significantly improved, and the accuracy and reliability of measurement have been significantly improved. From the perspective of engineering application experience, the accuracy of grid parameters is one of the important factors that affect the credibility of grid state perception results. [0003] Grid parameters mainly refer to the static parameters of lines and transformers. With the implementation of west-to-east power transmission and national networking strategies, a wide-area power ...

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Problems solved by technology

[0009] 1) It is sensitive to measurement errors, manually set thresholds, numerical conditions and suspicious parameter settings, and may have numerical stability problems;

[0010] 2) The real source of the measurement residual cannot be identified, or the source can be identified, but in the case of multiple measurement errors and parameter errors, repeated iterations are required, which is inefficient;

[0011] 3) A single operating section is mostly used for parameter estimation, and after the power grid parameters are augmented into state variables, the measurement redundancy becomes lower;

[0012] The above disadvantages cause the existing parameter error identification and estimation techniques to be inefficient and inaccurate

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