Method for detecting three-phase electric parameter
A technology of parameter detection and detection method, which is applied in the direction of using digital measurement technology for measurement and electric power measurement by applying digital technology, so as to achieve the effect of reducing the operation speed
Inactive Publication Date: 2015-04-08
HANGZHOU WEIHENG TECH
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Problems solved by technology
[0005] The present invention aims to solve the problems existing in the existing three-phase electrical parameter detection methods, and provides a method for reducing the cost of the system while taking into account the system operation speed without affecting the measurement accuracy. Three-phase electrical parameter detection method for output compensation, scientific collection and processing parameters
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[0013] The present invention will be further described below in conjunction with the accompanying drawings.
[0014] A three-phase electrical parameter detection method, the principle is as follows figure 1 As shown, a single-chip microcomputer is used, and the single-chip microcomputer is equipped with a voltage and current signal collector and an electric energy metering chip. When the detection method is processing the voltage and current signals, under the premise that the active power remains unchanged, the harmonics in the detected system The reactive power is compensated, and the detection method also uses Laplace transform to analyze the A / D signal of the three-phase electrical parameters, and combines the zero point and pole analysis of the time domain and the complex frequency domain to analyze the voltage and current signals. For accurate calculation and collection, the single-chip microcomputer uses the STM32F103VET6 chip based on the Cortex-M3 core as the main chi...
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The invention discloses a method for detecting a three-phase electric parameter. A single chip microcomputer is adopted and is provided with a voltage and current signal acquirer and an electric energy metering chip. When the detection method is used for processing a voltage signal and a current signal, on the premise that active power is not changed, compensation can be made for reactive power of harmonic waves in a detected system; an A / D (analog / digital) signal of the three-phase electric parameter can be analyzed by laplace transformation, and the voltage signal and the current signal are precisely calculated and acquired by combining zero point and pole point analysis of a time domain and a complex frequency domain; the single chip microcomputer adopts an STM32F103VET6 chip based on a Cortex-M3 kernel as a main chip. On the premise that the measurement precision is not affected, the computing speed of a system is considered, and the cost of the system is reduced; the reactive power of the harmonic waves in the system can be compensated, and the obtained three-phase electric parameter is scientifically acquired and processed.
Description
technical field [0001] The invention relates to the technical field of electric power detection, in particular to a three-phase electric parameter detection method. Background technique [0002] The detection methods of the three-phase electrical parameters in the prior art mainly include the following types: one is to use voltage transformers and current transformers to collect the voltage and current signals of the three-phase electrical parameters, and then pass the obtained small signals through a dedicated electric energy metering chip , the metering chip calculates and transmits the data to the single-chip microcomputer, and the single-chip microcomputer integrates the calculated data and displays it; the second is to directly divide the voltage signal into the A / D chip (analog-to-digital conversion chip) to obtain the real-time voltage value, and the current passes through The current transformer passes the obtained data through the current-voltage conversion circuit,...
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Login to View More IPC IPC(8): G01R19/25G01R21/133
Inventor 路国卫朱庆王江峰郎向荣
Owner HANGZHOU WEIHENG TECH