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Rapid harmonic wave analyzing method and device of power system

A fast analysis and power system technology, applied in the fields of current harmonic analysis and automatic monitoring, current signal harmonic analysis, three-phase voltage of power system, and grid voltage, which can solve the limitation of power quality analysis applications and the inability to perform radix-2FFT operation. , low computational efficiency, etc.

Active Publication Date: 2014-07-16
SOUTHEAST UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The sampling interval of the ADE7878 is 125us, and each cycle samples 160 points, which is not an integer power of 2, so it cannot perform conventional radix-2FFT operations, which also limits its application in power quality analysis
[0004] When performing FFT transformation, it is usually required that the number of sampling points N is an integer power of 2. If this condition is not met, DFT operation can be performed directly, but the calculation efficiency is low; it is also possible to simply add a finite length of zero sampling sequence to make N 2 Integer power of , but for the application of ADE7878, N=160, 2 8 =256,2 7 =128, 96 points need to be filled with zeros, the frequency spectrum will change greatly, and it is not economical in terms of calculation efficiency

Method used

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  • Rapid harmonic wave analyzing method and device of power system
  • Rapid harmonic wave analyzing method and device of power system
  • Rapid harmonic wave analyzing method and device of power system

Examples

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Embodiment 1

[0054] A method for quickly analyzing harmonics in a power system, comprising the following steps:

[0055] Step 1: Start the SPI communication mode of ADE7878, set the registers of ADE7878, enable the microprocessor as the master mode, and ADE7878 as the slave mode:

[0056] Step 1.1: Initialize the SPI register of the microprocessor and set it to host mode;

[0057] Step 1.2: Set the PM0 pin in ADE7878 to high level and the PM1 pin to low level to start the normal power consumption mode;

[0058] Step 1.3: Switch the chip select signal pin SS of ADE7878 from high level to low level three times to enable its SPI communication mode, write arbitrary data to the CONFIG2 register, and lock the SPI serial port mode.

[0059] Step 2: The data update interval of ADE7878 is 125us, and 160 signals are collected every 20ms of power frequency cycle. Use the microprocessor to set the timer interrupt, read the ADE7878 registers VAWV, VBWV, VCWV, IAWV, IBWV and ICWV every 500us, and cont...

Embodiment 2

[0093] An operating device for a power system harmonic analysis method, the device mainly comprising: a power signal acquisition and conditioning circuit 101, an electric energy metering ADE7878102, a power supply 103, a central processing unit 104, a real-time clock 105, NORFlash106, RAM107, SPIFlash memory (108), RS485 communication interface 109, programming switch 110, electric energy pulse output interface 111, described power signal acquisition conditioning circuit 101 adopts voltage, current transformer, the current signal sent into ADE7878 is a differential signal form, and the voltage signal is a single-ended mode; Electric energy metering ADE7878102 is designed with overvoltage protection circuit as the slave of SPI communication mode; Described central processing unit 104 adopts floating-point type DSP; Described NorFlash (106) is used for the final executable program of storage module; Described SPIFlash memory (108) be used for storing the electric energy data of A...

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Abstract

The invention provides a rapid harmonic wave analyzing method and device of a power system. The method includes a hanning window windowing processing, a combinatorial number FFT algorithm and an interpolation correction algorithm. The method includes the steps that firstly, hanning window weighting processing is conducted on a collected three-phase voltage signal and a collected three-phase current signal of the power system, then combinatorial number FFT conversion is conducted, and fundamental wave components and sub-harmonic components of the three-phase voltage signal and the three-phase current signal are obtained through interpolation correction. The device comprises a power signal acquisition conditioning circuit, an electric energy measuring ADE7878, a power supply, a central processor, a real-time clock, a NORFlash memory, an RAM memory and an SPIFlash memory, an RS485 communication interface, a programming switch and an electric energy pulse output interface. The ADE7878 is widely used in the aspects of electric energy data real-time collection and electric energy quality real-time monitoring, however, the data updating interval of the ADE7878 is 125 us, 160 signals are acquired in each period, and therefore a conventional base-2FFT cannot be conducted.

Description

technical field [0001] The present invention relates to three-phase voltage and current harmonic analysis and automatic monitoring technology of power system, in particular to an algorithm and device for grid voltage and current signal harmonic analysis, which can be applied to the instrument device for real-time monitoring and analysis of grid electric energy, belonging to Power measurement and automation technology field. Background technique [0002] In recent years, with the use of a large number of power electronic components and other nonlinear equipment, the harmonic pollution of the power grid has seriously deteriorated, which has affected electrical equipment. Big public nuisance. Timely and accurate grasp of the harmonic component parameters in the power grid can provide a good basis for harmonic control and maintain the safe operation of the power grid. [0003] As a three-phase electric energy measurement IC, ADE7878 is widely used in power grid signal analysis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
Inventor 章国宝张露虞金花鲁小雨黄永明
Owner SOUTHEAST UNIV
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