Measurement method of electric energy meter based on s-transformation under non-ideal conditions
A measurement method and non-ideal technology, applied in the field of measurement, can solve problems such as complex realization, aliasing measurement error, and reduction of complexity, and achieve the effect of solving frequency aliasing and high-precision measurement
Active Publication Date: 2022-07-29
STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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Problems solved by technology
However, when the wavelet transform method deals with distorted signal data, there will be frequency aliasing phenomenon, which will increase the measurement error, and the application of intelligent algorithms such as neural networks will have problems such as complex implementation.
The S transform separates the different frequency components in the signal data without multiple divisions like the wavelet transform, which reduces the complexity of the implementation and can eliminate the frequency aliasing phenomenon, but it is difficult to obtain a good time by the conventional S transform. frequency resolution
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[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0039] The embodiment of the electric energy meter measurement method based on S transform under non-ideal conditions uses S transform to measure the voltage signal with an amplitude of 220V, a frequency of 50Hz, and simultaneous sag and distortion, as well as a voltage signal with an amplitude of 10A, a frequency of 50Hz, and a temporary The current signal of drop and distortion is comprehensively analyzed, and the harmonic of 80Hz is considered for the voltage, and the harmonic of 90Hz is considered for the residual. The corresponding voltage and current signal models are:
[0040]
[0041] Its waveform is as figure 2 and image 3 As shown, the voltage and current signal data have obvious harmonic distortion and so on.
[0042] 1) First, determine the scale factor type in the S-transform by selecting the values of υ and γ. When υ=1 and...
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The invention discloses an electric energy meter measurement method based on S-transformation under non-ideal conditions, establishes a data model under non-ideal environment, uses the time-frequency transform analysis method of S-transformation, and forms a two-dimensional complex number of signal data according to the result of the S-transformation The data of each row of the matrix R represents the amplitude and phase information of each frequency component after S-transformation at different sampling time points, and then the fundamental frequency component under S-transformation and the harmonic component under S-transformation are extracted according to the two-dimensional complex matrix R. The invention can effectively perform comprehensive analysis and evaluation on the measurement data of the electric energy meter in the non-ideal environment such as harmonics, sags, and sudden changes, solve the phenomenon of frequency aliasing existing in the existing wavelet transform and other technologies, and accurately separate and measure the fundamental wave and Various harmonic components, so as to achieve high-precision measurement of electric energy in non-ideal environments such as harmonics.
Description
technical field [0001] The invention relates to an electric energy meter measurement method based on S-transformation under non-ideal conditions, and belongs to the technical field of measurement. Background technique [0002] The accuracy of metering results of electric energy meters in modern smart grids is crucial to realizing the economical and efficient operation of smart grids. At the same time, as the basis for electricity cost accounting among power generation enterprises, transmission and distribution enterprises and power users, the accuracy of smart energy meters is directly related to the economic interests of the three. The electricity metering result data is related to the reliability of the operation of the electric energy meter, so it is necessary to comprehensively analyze and evaluate the metering data of the electric energy meter. In the development process of the comprehensive evaluation of electric energy meters, many relevant standards and specificatio...
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IPC IPC(8): G06K9/00G06F30/20
CPCG06F30/20G06F2113/04G06F2218/06G06F2218/08
Inventor 张月赵罡顾文彬陈永明李静侯超任秋业周军刘璐邱娟
Owner STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO