CN209784432U

CN209784432U - Electric energy quality disturbance signal acquisition device

Info

Publication number: CN209784432U
Application number: CN201920294355.4U
Authority: CN
Inventors: 张斌; 曾渝; 张奕沛; 曾文入
Original assignee: Xihua University
Current assignee: Xihua University
Priority date: 2019-03-08
Filing date: 2019-03-08
Publication date: 2019-12-13
Anticipated expiration: 2029-03-08

Abstract

The utility model discloses a power quality disturbance signal acquisition device, which is applied to the field of power disturbance and aims at the problem that the current power quality detection is inconvenient, the utility model respectively acquires three-phase voltage and three-phase current signals from a power grid through a voltage transformer and a current transformer; respectively converting the voltage analog signal of weak current and the current analog signal of weak current; a low-pass filter circuit is adopted to remove the high-frequency component of the analog signal and then input the analog signal into an A/D converter; the A/D converter realizes synchronous sampling of voltage and current signals under the control of a phase-locked loop, and digital signals converted by the A/D converter are sent to a DSP + ARM dual-core processor to obtain detection signals; the utility model discloses a device is small, and convenient to carry can realize the continuous collection of electric energy quality disturbing signal.

Description

Electric energy quality disturbance signal acquisition device

Technical Field

The utility model belongs to electric power disturbance field, in particular to power quality disturbance signal acquisition device.

Background

With the rapid development of economy, the proportion of nonlinear load users in the power grid is higher and higher, and therefore the problem of power quality is caused. Because of the gradual improvement of the automation degree of industrial production and the electrification degree of people's life, along with the rapid development of scientific technology and industrial intelligence, the influence of the quality problem of electric energy on important fields such as aerospace, automobiles, electronic manufacturing and the like is increasingly remarkable, more and more precise equipment is put into use, the equipment is sensitive to the change of voltage and current, the working state is easily influenced by the quality of the electric energy, and the requirement of the equipment on the quality of the electric energy is higher than that of the traditional equipment. Therefore, the treatment of the power quality problem is widely concerned and researched. The key step of the management of the power quality problem is the identification of power quality disturbance, namely power quality disturbance detection and classification identification.

The fluctuating loads such as an electric arc furnace, a large-scale rolling mill, an electric locomotive and the like are increased, and a large amount of higher harmonics are generated when the electric arc furnace, the large-scale rolling mill, the electric locomotive and the like run, so that the voltage and current waveforms of a power grid are distorted, and the problems of voltage fluctuation, flicker, voltage sag and other electric energy quality are caused, and the problems not only influence the safe and stable running of the power grid, but also have great influence on national economy.

In order to improve the power quality and make relevant treatment measures, the power department needs to continuously measure the power quality and provide conditions for identification and classification of disturbance signals.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve above-mentioned technical problem, provide an electric energy quality disturbing signal collection system, can realize portablely and continuous gathering electric energy quality disturbing signal.

The utility model adopts the technical proposal that: an electrical energy quality disturbance signal acquisition device, comprising: the device comprises a voltage transformer, a current transformer, a first low-pass filter circuit, a second low-pass filter circuit, an A/D converter and a main processor; the input end of the voltage transformer is connected with the three-phase voltage in the power grid, the output end of the voltage transformer is connected with the input end of the first low-pass filter circuit, and the output end of the first low-pass filter circuit is connected with the first input end of the A/D converter; the input end of the current transformer is connected with three-phase current in the power grid, the output end of the current transformer is connected with the input end of the second low-pass filter circuit, and the output end of the second low-pass filter circuit is connected with the second input end of the A/D converter; the output end of the A/D converter is connected with the input end of the main processor; the main processor is internally provided with a power supply module which supplies power to the main processor.

The input end of the phase-locked loop module is connected with the output end of the voltage transformer, and the output end of the phase-locked loop module is connected with the third input end of the A/D converter.

Further, the main processor is a DSP + ARM dual-core processor.

Furthermore, the DSP and the ARM dual core communicate with each other through a heterogeneous multi-core communication component Sys Link provided by the TI.

Further, the host processor model is OMAP-L138.

Further, the model of the power supply module is XRP6658 ISTR-F.

Further, the system also comprises an LCD which is connected with the main processor and is used for displaying the output result of the main processor.

Further, the SD card is connected with the main processor.

The utility model has the advantages that: the utility model discloses a communicate through the heterogeneous many internuclear communication subassembly Sys Link that TI provided between the main processor DSP and the ARM binuclear, ARM core is responsible for system control and data storage etc. in the binuclear, and the DSP core is responsible for AD's control, signal acquisition and carries out electric energy quality disturbance identification operation to the signal of gathering; compared with the ARM acquisition mode in the prior art, the utility model uses the DSP to acquire data, thereby avoiding the transmission of a large amount of acquired data between two cores, and the data acquisition efficiency is higher; the device of the utility model has small volume and convenient carrying, and is more convenient for the continuous collection of the electric energy quality disturbance signal; and convenience is provided for automatic identification of subsequent power quality disturbance signals.

Drawings

Fig. 1 is a block diagram of the apparatus of the present invention.

Detailed Description

To facilitate understanding of the technical contents of the present invention by those skilled in the art, the present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, the invention relates to an automatic identification device for power quality disturbance signals; the method comprises the following steps: the device comprises a voltage transformer, a current transformer, a first low-pass filter circuit, a second low-pass filter circuit, a phase-locked loop, an AD760 conversion module, an OMAP-L138 main processor module, an external communication module, and a man-machine interaction module (an LCD, a keyboard, a liquid crystal display, a keyboard) connected with the processor, a storage module and the like.

The voltage transformer is a precise voltage transformer, and the type is as follows: SPT 204A; the current transformer is a precise current transformer, and the type is as follows: SCT254 AK; the voltage transformer and the current transformer respectively collect three-phase voltage and three-phase current signals from a power grid; the voltage analog signal converted into weak current by the voltage transformer is sent to the first low-pass filter circuit, and the voltage analog signal with high-frequency components removed by the first low-pass filter circuit is input to the A/D converter; the current analog signal converted into weak current by the current transformer is sent into a second low-pass filter circuit, the current analog signal after the high-frequency component is removed by the second low-pass filter circuit is input into an A/D converter, the A/D converter realizes the synchronous sampling of voltage and current signals under the control of a phase-locked loop, and the digital signal converted by the A/D converter is sent into a main processor, the model of the main processor of the utility model is OMAP-L138, the OMAP-L138 main processor is a DSP + ARM dual-core processor, after the DSP obtains the digital signal of the voltage and current sampling data of the power network, the data is calculated to obtain the corresponding basic parameters of three-phase voltage, current, power and the like, then the classification of disturbance signals is completed by executing a one-dimensional convolutional neural network in combination with a long-time memory network classification algorithm, and the specific classification algorithm is the prior art, reference may be made to: deep Power: deep Learning architecture for Power quality issues Classification; the ARM is responsible for system control and data storage, is responsible for displaying information such as detection parameters and identification results and realizing related human-computer interaction functions through a 7-inch LCD touch screen of an LCD, and is stored in the SD card storage module; and two communication modes of Ethernet and UART are adopted to realize data transmission with an upper computer.

The utility model discloses a OMAP-L138 chip that electric energy quality disturbing signal collection system adopted supports floating point operation based on DSP + ARM dual-core processor, not only has superstrong digital signal processing ability, still has powerful ARM kernel.

The utility model provides a first low pass filter circuit and second low pass filter circuit can adopt the general type active filter MAX275 realization of American MAXIM company production.

The utility model provides a phase-locked loop is CMOS integrated circuit CD4046 chip.

The utility model discloses DSP + ARM dual core processor embeds power module, and the power module model that provides the power for the host processor is XRP6658 ISTR-F.

It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention, and it is to be understood that the scope of the invention is not limited to such specific statements and embodiments. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An electric energy quality disturbance signal acquisition device, comprising: the device comprises a voltage transformer, a current transformer, a first filter circuit, a second filter circuit, an A/D converter and a main processor; the input end of the voltage transformer is connected with the three-phase voltage in the power grid, the output end of the voltage transformer is connected with the input end of the first filter circuit, and the output end of the first filter circuit is connected with the first input end of the A/D converter; the input end of the current transformer is connected with three-phase current in the power grid, the output end of the current transformer is connected with the input end of the second filter circuit, and the output end of the second filter circuit is connected with the second input end of the A/D converter; the output end of the A/D converter is connected with the input end of the main processor; the main processor is internally provided with a power supply module which supplies power to the main processor.

2. The electric energy quality disturbance signal acquisition device according to claim 1, further comprising a phase-locked loop module, wherein an input end of the phase-locked loop module is connected with an output end of the voltage transformer, and an output end of the phase-locked loop module is connected with a third input end of the A/D converter.

3. The power quality disturbing signal collecting device of claim 1, wherein said main processor is a DSP + ARM dual-core processor.

4. The device for acquiring the electric energy quality disturbing signal according to claim 3, wherein the DSP and the ARM dual core communicate with each other through a heterogeneous multi-core communication component Sys Link provided by TI.

5. The power quality disturbance signal acquisition device according to claim 4, wherein the main processor model is OMAP-L138.

6. The power quality disturbing signal collecting device as claimed in claim 1, wherein the power module is model XRP6658 ISTR-F.

7. The power quality disturbance signal acquisition device according to claim 1, further comprising an LCD liquid crystal display, connected to the main processor, for displaying the output of the main processor.

8. A power quality disturbance signal acquisition device according to claim 1, further comprising an SD memory card, wherein the SD memory card is connected to the main processor.