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Metering error calculation method based on ITD and time sequence analysis

A technology for time series analysis and error measurement, applied in computing, instrumentation, data processing applications, etc., can solve problems such as over/under envelope, difficulty in selecting the optimal smoothing step size, and large amount of calculations that cannot be used for online analysis

Inactive Publication Date: 2016-12-07
STATE GRID CHONGQING ELECTRIC POWER +2
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Problems solved by technology

At present, wavelet transform, Empirical Mode Decomposition (EMD) and local mean decomposition are mainly used. Among them, wavelet transform uses fixed basis functions to decompose time series, which has limited ability to represent local features and cannot perform adaptive decomposition; and The empirical mode decomposition method can adaptively decompose non-stationary time series into multiple eigenmode components, but this method still has deficiencies such as endpoint effects, mode aliasing, and over / under-envelope; in order to solve the over / under-envelope problem and to alleviate the endpoint effect, the local mean decomposition method decomposes the complex time series into multiple product functions multiplied by the amplitude modulation and frequency modulation signals, but the selection of the optimal smoothing step size of this method is difficult, and the large amount of calculation cannot be used for online analysis

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  • Metering error calculation method based on ITD and time sequence analysis
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  • Metering error calculation method based on ITD and time sequence analysis

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Embodiment Construction

[0030] The measurement error calculation method based on ITD and time series analysis of the present invention comprises the following steps:

[0031] A. Decompose the measurement error historical time series x(t) into n rotation components x using ITD method R1 (t),x R2(t),...,x Rn (t) and 1 trend component x T (t);

[0032] B. Establish n rotation components x respectively R1 (t),x R2 (t),...,x Rn (t) ARIMA prediction sub-model M R1 , M R2 ,...,M Rn , x Rn The ARIMA(p,d,q) model of (t) is: Where: (1-z -1 ) d is the d-time difference operator, and the coefficient of the rotation component model is obtained by calculation and θ Rnj , i=1,2,...,p and j=1,2,...,q;

[0033] C. Establish trend component x T ARMA prediction submodel M of (t) T , x T The ARMA(p,q) model of (t) is:

[0034] In the formula: z -i is the unit delay operator, and is the autoregressive function (order p) and coefficient, θ q (z -1 ) and θ j is the moving average function (q ...

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Abstract

The invention discloses a metering error calculation method based on ITD and time sequence analysis. According to the metering error calculation method based on ITD and time sequence analysis, rotational components and trend components of a metering error historical time sequence are separated online through the ITD decomposition method, an ARMA model is adopted to the trend components changing stably for error modeling prediction, an ARIMA model is adopted to the rotational components not changing stably for predicting this part of errors, finally, prediction values of all error component prediction models are superposed, the prediction result of electric power metering errors is calculated in real time, and online analysis and small prediction errors can be achieved. The method is suitable for application and popularization in the technical field of gateway metering equipment condition assessment.

Description

technical field [0001] The invention relates to the technical field of status evaluation of gateway metering equipment, in particular to a method for calculating metering errors based on ITD and time series analysis. Background technique [0002] With the deepening of the market-oriented reform of the power industry, the exchange of power at grid-connected power generation, inter-regional power transmission, inter-provincial power transmission and provincial power supply is increasing, and power companies have begun to pay more attention to the maintenance of their own economic interests. How to ensure the accuracy of electric energy metering devices and maintain the fair and orderly operation of the electricity market is an important topic in the current research of the electricity market. The operation management of electric energy metering devices at the gateway mainly includes on-site inspection and periodic rotation. DL / T 448-2000 "Technical Management Regulations for E...

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/06
CPCG06Q10/04G06Q50/06
Inventor 何蓓肖冀周峰蒋鑫源周全程瑛颖李刚
Owner STATE GRID CHONGQING ELECTRIC POWER
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