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Electric energy metering method

A technology of electric energy measurement and electric energy measurement system, applied in the field of electric energy measurement, can solve problems such as poor electric energy accuracy, and achieve the effects of strong measurement accuracy, simple structure and less hardware resources

Inactive Publication Date: 2016-09-21
国网黑龙江省电力有限公司佳木斯供电公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The present invention is to solve the problem that there is an unsteady-state distortion signal in the existing power grid signal, which leads to the poor accuracy of the measured electric energy

Method used

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specific Embodiment approach 1

[0038] Specific implementation mode one: refer to picture 1 Describe this embodiment in detail, the A method of measuring electric energy , which is realized based on an electric energy metering system. An electric energy metering system includes a housing, a control panel, input terminals, output terminals, a power supply, a touch screen controller, an analog signal generator 1, a data acquisition module 2 and a main control Unit 3,

[0039] The power supply, touch screen controller, analog signal generator 1, data acquisition module 2 and main control unit 3 are all installed in the housing, and the control panel, input terminals and output terminals are all on the upper surface of the housing.

[0040] The analog signal generator 1 comprises a shaping circuit 1-1, a phase-locked loop circuit 1-2, a frequency divider circuit 1-3, a ROM memory 1-4 and a multiplication type D / A converter 1-5,

[0041] Main control unit 3 comprises ARM controller 3-1, DSP3-2 and communicat...

specific Embodiment approach 2

[0063] Specific implementation mode two: refer to picture 2 This implementation mode is described in detail, and this implementation mode is described in the first specific implementation mode A method of measuring electric energy For further explanation, in this embodiment, the phase-locked loop circuit 1-2 includes a CMOS phase-locked loop integrated chip A1 whose model is CD4046, a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a capacitor C2,

[0064] The frequency divider circuit 1-3 includes the synchronous reversible counter A2 of No. 1 model 74HC193, the synchronous reversible counter A3 of No. 2 model 74HC193 and the synchronous reversible counter A4 of No. 3 model 74HC193,

[0065] The No. 14 pin of the CMOS phase-locked loop integrated chip A1 whose model is CD4046 is connected to the shaping signal output terminal of the shaping circuit 1-1,

[0066] The No. 6 pin of the CMOS phase-locked loop integrated chip A1 whose model is CD4046 is connected...

specific Embodiment approach 3

[0074] Specific implementation mode three: refer to picture 4 This implementation mode is described in detail, and this implementation mode is described in the first specific implementation mode A method of measuring electric energy For further explanation, in the present embodiment, the multiplying D / A converter 1-5 comprises the multiplying digital-to-analog conversion chip that the model is AD7845, resistor R4, resistor R5 and operational amplifier OP,

[0075] The No. 2 to No. 14 pins of the AD7845 multiplication digital-to-analog conversion chip are connected to the buffer signal output terminals of the ROM memory 1-4,

[0076] The 12th and 18th pins of the AD7845 multiplying digital-to-analog conversion chip are connected to the power ground,

[0077] The No. 1 pin and the No. 23 pin of the multiplication digital-to-analog conversion chip whose model is AD7845 are connected to the conversion signal input end of the data acquisition module 2,

[0078] The No. 22 pin ...

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Abstract

The invention provides an electric energy metering method which relates to the field of electric energy metering. The invention solves the problem that unstable distortion signals among power grid signals make the measurement of electric energy inaccurate. Two standard sinusoidal signals are inputted to the shaping signal input end of a shaping circuit and the input end of a multiplication type D / A converter respectively; the shaping circuit outputs a square wave signal, and the square wave signal is added to the input end of a phase locked loop (PLL) circuit; and through the PLL circuit, the signal is transmitted to a frequency divider circuit, and then to an ROM memory, so as to realize that the phase locked loop circuit controls the ROM memory to send a digital signal. Another standard sinusoidal signal and the digital signal undergo mixed analog and digital multiplication in the multiplication-type D / A converter to form a distortion signal; and an ARM controller controls a DSP to carry out wavelet analysis, reconstruction and calculation on the distorted signal. According to specific situations, the distorted power grid signal is decomposed into different frequency bands for electric energy measurement. The method is used for electric energy metering.

Description

technical field [0001] The invention relates to an instrument capable of measuring electric energy reasonably and accurately, in particular to a high-precision instrument capable of measuring electric energy reasonably and accurately under the conditions of harmonic, interharmonic, continuous spectrum and impact interference distortion. Background technique [0002] With the continuous improvement of the level of industrial automation and the continuous increase of nonlinear loads, the grid signal contains more and more steady-state distortion signals such as harmonics and inter-harmonics and unsteady-state distortion signals with strong impact and time-varying. The distorted grid signal will inevitably lead to complex power flow between the grid and the load, so how to measure the electric energy reasonably and accurately under the condition of distorted signal is an urgent problem to be solved. Contents of the invention [0003] The invention aims to solve the problem of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R22/06
CPCG01R22/06
Inventor 张晓冰姜世超王保军姜军李军
Owner 国网黑龙江省电力有限公司佳木斯供电公司
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