Online estimation method used for time-varying measurement data variance

A technology for measuring data and variance, applied in complex mathematical operations, etc., can solve problems such as inequality, lack of practicability, and inability to consider the interference of information transmission process, and achieve the effect of widespread application

Active Publication Date: 2017-11-21
NARI TECH CO LTD +1
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Problems solved by technology

If the design accuracy of the meter is directly used to estimate the variance, it is inevitable that the interference in the information transmission process cannot be considered, and the meter accuracy in field operation may not be equal to the theoretical design value.
[0003] Although many methods for recursively estimating the measurement variance have been developed, they mainly estimate the variance step by step by constructing a state estimation model. These methods rely on the accuracy of the model parameters, which will lead to a lack of practicality in many occasions.

Method used

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  • Online estimation method used for time-varying measurement data variance
  • Online estimation method used for time-varying measurement data variance
  • Online estimation method used for time-varying measurement data variance

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings.

[0048] Such as figure 1 As shown, the online estimation method for time-varying measurement data variance of the present invention comprises the following steps,

[0049] Step (A), construct the invariant of the measurement data through the constraints of physical laws, and the linear combination of the physical quantities corresponding to the relevant measurement, if it is a fixed constant, then take the real value of the invariant as the fixed constant, and the measured value of the invariant as the relevant measurement The linear combination of physical quantities;

[0050] Step (B), obtaining the measurement sequence of the invariant online through real-time sampling, and calculating the variance characteristics of the invariant through mathematical statistics, including the following steps,

[0051] (B1), real-time sampling online acquisition of invariant measur...

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Abstract

The invention discloses an online estimation method used for a time-varying measurement data variance. The measurement variance is estimated in real time through online data, so that the estimation is more accurate and reliable; by constructing an invariant, based on measurement data of the invariant, variance information can be obtained through statistics; variance information of single related measurement is further estimated; according to physical law constraints of an actual industrial site, a time-varying measurement data variance estimation model is built; the dependency on parameters is got rid of; and a result is obtained directly according to online sampling data. The method has certain universality, can be applied to different industrial fields, especially the field of a power system, and has wide promotion and application prospects.

Description

technical field [0001] The invention relates to the technical field of industrial measurement and control and instruments, in particular to an online estimation method for variance of time-varying measurement data. Background technique [0002] The standard way to obtain the variance of a measurement is to use multiple sampling data to obtain it based on the true value being constant. In the actual industrial field, the actual value of the measurement is likely to be constantly changing and cannot be known, which makes it difficult to have a general method for obtaining the measurement variance. In the field of power systems, state estimation procedures are very important to correctly obtain the current system state. In order to make state estimation more accurate and identify bad data more effectively, it is very important to obtain measurement variance information. If the design accuracy of the meter is directly used to estimate the variance, it is inevitable that the in...

Claims

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Application Information

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IPC IPC(8): G06F17/18
CPCG06F17/18
Inventor 龚成明邹德虎李雷
Owner NARI TECH CO LTD
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