CN203965545U - Multiloop electric energy quality on-line monitoring device based on ARM and DSP - Google Patents

Multiloop electric energy quality on-line monitoring device based on ARM and DSP Download PDF

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Publication number
CN203965545U
CN203965545U CN201420403056.7U CN201420403056U CN203965545U CN 203965545 U CN203965545 U CN 203965545U CN 201420403056 U CN201420403056 U CN 201420403056U CN 203965545 U CN203965545 U CN 203965545U
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module
dsp
arm
electric energy
energy quality
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Inventor
李珉
潘勇
宣伟锡
陈铭
吴强
董震威
顾江
王璟
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Wuxi Power Supply Co of Jiangsu Electric Power Co
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Wuxi Power Supply Co of Jiangsu Electric Power Co
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Abstract

The utility model provides a kind of multiloop electric energy quality on-line monitoring device based on ARM and DSP, comprising: one or more measurement modules, for the power network signal of sampling, and carry out the data computing that the quality of power supply is relevant; An ARM module, is connected with measurement module, is the control core of this on-line measuring device, the data interaction of control survey module and ARM intermodule, and external communication interface is provided; A power module, for supplying measurement module and ARM module.Described measurement module comprises three pairs of voltage transformer (VT) summation current transformers, for monitor three-phase voltage and three-phase current simultaneously.The output termination AD modular converter of voltage transformer (VT) summation current transformer, AD modular converter is connected with DSP module.The output terminal of voltage transformer (VT) also connects DSP module by a phaselocked loop.DSP module is connected with ARM module.The utility model can carry out continuous monitoring and analysis to a plurality of monitoring points simultaneously, and has realized remote data transmission function.

Description

Multiloop electric energy quality on-line monitoring device based on ARM and DSP
Technical field
The utility model relates to multiloop electric energy quality on-line monitoring device, especially a kind of multiloop electric energy quality on-line monitoring device based on ARM and DSP.
Background technology
The spotlight that the < < of State Grid Corporation of China builds strong intelligent grid > > research report is: outstanding intelligent grid must be take " infotech " as guide, and the important embodiment of " infotech " is exactly " electric power operation persistent surveillance ", this just to electric system in real time, high precision, comprehensive monitoring mentioned a height never having.
Along with developing rapidly of national economy, impact, wavy load in electric system are increasing, as electric arc furnaces, heavy (merchant) mill, electric locomotive etc., they are in operation and not only produce a large amount of higher hamonic waves, and cause voltage fluctuation, flickering, three-phase imbalance, rise temporarily, fall temporarily, even interrupt.
In addition, along with Power Electronic Technique widespread use, in electric system, nonlinear load is increasing, as static converter, and industrial ac-dc conversion device etc.Nonlinear load can cause that power network current, voltage waveform distort, and causes the harmonic pollution of electrical network serious.
These not only can cause the security of electricity supply and use equipment itself to reduce to the adverse effect of electrical network, and the economical operation of meeting severe jamming electrical network.
The main task of electric energy quality monitoring is exactly voltage fluctuation, flickering, the three-phase imbalance of monitoring on each monitoring point of electric system, rises, falls temporarily, interrupts temporarily, and harmonic wave, a harmonic wave.
Electric energy quality monitoring is mainly the quality of power supply and controls service, the control that modern power electronics technology is the quality of power supply, even " customization " provide possible.
Summary of the invention
The purpose of this utility model is to provide a kind of multiloop electric energy quality on-line monitoring device based on ARM and DSP, be applicable to be installed on the quality of power supply of simultaneously monitoring 1~6 monitoring point (or loop) in transformer station, and can to a plurality of monitoring points, carry out continuous monitoring and analysis simultaneously, and possess remote ethernet communication function, realized remote data transmission.The technical solution adopted in the utility model is:
A multiloop electric energy quality on-line monitoring device based on ARM and DSP, comprising: one or more measurement modules, for the power network signal of sampling, and carry out the data computing that the quality of power supply is relevant; An ARM module, is connected with measurement module, is the control core of this on-line measuring device, the data interaction of control survey module and ARM intermodule, and external communication interface is provided; A power module, for to measurement module and ARM module for power supply.
Further, described measurement module comprises one or more pairs of voltage transformer (VT) summation current transformers; The output termination AD modular converter of voltage transformer (VT) summation current transformer, AD modular converter is connected with DSP module.The output terminal of voltage transformer (VT) also connects DSP module by a phaselocked loop, and phaselocked loop, for Tracking Frequency of Power Grids, makes the sampling rate of AD modular converter adapt to mains frequency.DSP module is connected with ARM module.
Further, measurement module specifically comprises three pairs of voltage transformer (VT) summation current transformers, for monitor three-phase voltage and three-phase current simultaneously.
Further, AD modular converter mainly consists of AD conversion chip AD73360L.
Further, the front end of AD modular converter is provided with single order RC low-pass filter, the input termination voltage transformer (VT) of RC low-pass filter or the output terminal of current transformer.
Further, DSP module mainly consists of dsp processor TMS320F2812.
Further, the interface of AD conversion chip AD73360L and dsp processor TMS320F2812 is specially: the MCLKXA end of the SCLK termination TMS320F2812 of AD73360L and MCLKRA end; The SDIFS end of AD73360L and the MFSXA end of SDOFS termination TMS320F2812 and MFSRA end; The MDXA end of the SDI termination TMS320F2812 of AD73360L; The MDRA end of the SDO termination TMS320F2812 of AD73360L; The RESET end of AD73360L and the GPIO14 end of SE termination TMS320F2812.
Further, ARM module comprises an ARM9 micro controller AT91SAM9261S and an ethernet controller; Between the dsp processor TMS320F2812 of ARM9 micro controller AT91SAM9261S and each measurement module, adopt SPI interface communication; Ethernet controller provides Ethernet interface.
Further, ARM9 micro controller AT91SAM9261S is used the slave of serial time clock line SPICLK, main frame input/slave output data line SPIMISO, main frame output/slave input data line SPIMOSI, Low level effective to select line SPISTE to connect each measurement module, and AT91SAM9261S only allows to enable a measurement module at any one time.
Further, the SPI clock module of ARM9 micro controller AT91SAM9261S is configured to the rising edge pattern without phase delay, and the SPI clock module of measurement module is configured to the negative edge pattern without phase delay.
The utility model has the advantage of:
1) on-Line Monitor Device can be monitored the quality of power supply of 1~6 monitoring point simultaneously, and it is also more succinct that it has significantly reduced monitoring device cost, the device space of greatly having saved transformer station, external cabling.
2) adopt embedded design---embedded microprocessor, embedded OS.
3) possess Ethernet interface, networking capability easily can be provided.
Accompanying drawing explanation
Fig. 1 is that structure of the present utility model forms schematic diagram.
Fig. 2 is measurement module structural drawing of the present utility model.
Fig. 3 is the preposition RC filtering circuit figure of Σ-Δ type ADC of the present utility model.
Fig. 4 is AD73360L of the present utility model and TMS320F2812 interface principle figure.
Fig. 5 is total software block diagram of measurement module of the present utility model.
Fig. 6 is sampling interruption subroutine block diagram of the present utility model.
Fig. 7 is SPI interface connection layout of the present utility model.
Fig. 8 is SPI clock module figure of the present utility model.
Embodiment
Below in conjunction with concrete drawings and Examples, the utility model is described in further detail.
A kind of multiloop electric energy quality on-line monitoring device based on ARM and DSP the utility model proposes, its implementation as shown in Figure 1.This on-Line Monitor Device also can be called monitoring terminal.
Monitoring terminal is arranged on monitoring field, simultaneously the quality of power supply of 6 monitoring points of monitoring substation (or transmission line circuit).3 phase voltages and 3 phase currents can be monitored in each monitoring point simultaneously, and corresponding, the sampling in the same time one by one of 3 phase currents and 3 phase voltages---and this is that accurately to measure power necessary.
Mainly by 6, independently measurement module, 1 ARM module form monitoring terminal; Also comprise a power module, for to measurement module and ARM module for power supply.
Measurement module is used for the power network signal of sampling, and carries out the data computing that the quality of power supply is relevant.Corresponding 1 measurement point of each measurement module, the three-phase U(voltage of 1 measurement point of each measurement module independent measurement), I(electric current), P(active power), Q(reactive power), PF(power factor (PF)), harmonic wave, flickering.Every monitoring terminal can be joined at most 6 measurement modules.
ARM module is connected with measurement module, is the control core of this on-line measuring device, the data interaction of control survey module and ARM intermodule, and external communication interface is provided.ARM module mainly consists of parts such as the color LCD touch-screen of 1 ARM9 micro controller AT91SAM9261S, 17 inch 800 * 480 resolution, 1 real-time clock, 1 ethernet controller, Flash storeies.Monitoring terminal externally provides 1 Ethernet interface, 1 RS485 interface, 1 RS232 interface, and they can use simultaneously.
Each measurement module comprises 1 32 bit DSP (dominant frequency 150MHz), 1 16 sigma-delta type ADC, 3 pairs of high-precision micro PT(voltage transformer (VT)), CT(current transformer) etc. parts---referring to Fig. 2.The hardware of each measurement module, software are identical.
AD(modulus) modular converter adopts AD conversion chip AD73360L to form, and dsp processor TMS320F2812 and peripheral cell thereof form DSP module.Concrete annexation is: the output termination AD modular converter of voltage transformer pt summation current transformer CT, and AD modular converter is connected with DSP module; The output terminal of PT also connects DSP module by a phaselocked loop, and phaselocked loop, for Tracking Frequency of Power Grids, makes the sampling rate of AD modular converter adapt to mains frequency; DSP module is connected with ARM module.
The ADC of the utility model measurement module selects 16 sigma-delta type ADC---the AD73360L of U.S. ADI company, and it is the state-of-the-art ADC chip gathering for electric power signal at present.The principal feature of AD73360L:
(1) adopt synchronous serial port transmission, and the front-end sampling frequency of ADC and all control able to programme (the highest sampling can be supported 64kHz) of rear end transfer rate, and though make its with quick DSP or at a slow speed MCU be connected all very convenient; Especially its serial port (SPORT) is completely compatible with the McBSP module of TMS320F28 series, communicates by letter easy.
Isolation mutually between (2) 6 sampling channels, and each road all contains input gain amplifier on complete signal modulate circuit and sheet, and control able to programme is selected, and allows the input of low level amplitude simulating signal; Each passage is all taked synchronized sampling, to guarantee not life period delay between passage.At power system measuring, can carry out the sampling of three-phase voltage and three-phase current, needn't consider phase delay, make to measure more accurate.
(3) due to utilization principle, AD73360L has well built-in anti-aliasing performance.Therefore the analog signal processing of ADC can be very simple, conventionally only needs a single order RC low-pass filter, referring to Fig. 3, and the input termination voltage transformer (VT) of RC low-pass filter or the output terminal of current transformer.
(4) mode of operation can be selected in data pattern, program schema and program/data mixing pattern, is suitable for various measurement occasions.。
After AD73360L sampling power network signal, send into DSP and process.AD73360L and dsp interface circuit are as shown in Figure 4.The interface of AD conversion chip AD73360L and dsp processor TMS320F2812 is specially: the MCLKXA end of the SCLK termination TMS320F2812 of AD73360L and MCLKRA end; The SDIFS end of AD73360L and the MFSXA end of SDOFS termination TMS320F2812 and MFSRA end; The MDXA end of the SDI termination TMS320F2812 of AD73360L; The MDRA end of the SDO termination TMS320F2812 of AD73360L; The RESET end of AD73360L and the GPIO14 end of SE termination TMS320F2812.
Due to the communication mode of AD73360L and the McBSP interface compatibility of TMS320F2812, therefore directly use both to communicate.The frame synchronizing signal that signal post is set to be needed is provided by AD73360L; After powering on, AD73360L is in program state, by DSP, by the single transmission of control word, and detects the tagged word that returns to judge whether correct reception.Set the completion confirmation after errorless AD73360L is revised as to data mode, it is that FIFO interrupts receiving that McBSP is set.Considering three-phase voltage current 6 tunnels altogether, receive FIFO buffering and interrupt being set to 6 grades, i.e. there is receive interruption one time in full 6 data of every reception.McBSP has 16 grades of FIFO bufferings, and the delay of short period can't cause loss of data, has therefore increased the dirigibility of Software for Design.
Total software function block diagram of measurement module as shown in Figure 5.After powering at every turn, the link such as initialize communications, demonstration first.Each major cycle of system all completes U, an I, P, Q, kWh(charge value), calculating, the storage of the variable such as kvarh (capacity of idle power), PF, degree of unbalancedness, harmonic wave, flickering.
The dsp software scheme of measurement module is interrupted the FIFO receive interruption called after sampling of McBSP, and software block diagram as shown in Figure 6.
For guaranteeing that ARM module, with carrying out reliably at a high speed message exchange between measurement module, adopts SPI interface communication between the AT91SAM9261S of multiloop electric energy quality on-line monitoring device of the utility model design and the dsp processor TMS320F2812 of each measurement module.
SPI is a kind of high speed, full duplex, synchronous communication bus.SPI interface is with master-slave mode work, and this mode conventionally has a main equipment and one or more is from equipment.4 lines of general use: the slave of serial time clock line SPICLK, main frame input/slave output data line SPIMISO, main frame output/slave input data line SPIMOSI, Low level effective is selected line SPISTE.Whether wherein SPISTE controls slave SPI selected, while only having chip selection signal to enable, just effective to the operation of slave.This just allows to connect a plurality of SPI equipment on same bus becomes possibility.Having a plurality ofly during from equipment, each needs independently enable signal from equipment.In SPI communication in this terminal, AT91SAM9261S is as SPI main equipment, each measurement module as SPI from equipment---referring to Fig. 7.AT91SAM9261S respectively by 6 independently select lines enable 6 measurement modules, AT91SAM9261S only allows to enable a measurement module at any one time.
In SPI transmission data procedures, by SPICLK, provide time clock, SPIMISO, SPIMOSI completes data transmission based on this pulse.SPI has four kinds of different clock modules---referring to Fig. 8.Clock polarity determines that clock is effectively along being rising edge or negative edge, and clock phase determines whether clock has 1/2 cycle delay.Negative edge without phase delay: SPICLK is effectively high, at SPICLK negative edge, sends data, at SPICLK rising edge, receives data.The negative edge that has phase delay: SPICLK is for effectively high, and the half period before SPICLK negative edge sends data, at SPICLK signal negative edge, receives data.Rising edge without phase delay: SPICLK is low effectively, in the rising edge transmission data of SPICLK signal, in the negative edge reception data of SPICLK signal.The rising edge that has phase delay: SPICLK is low effectively, and the half period before the negative edge of SPICLK signal sends data, and receives data at the rising edge of SPICLK signal.
SPICLK signal wire can only be controlled by AT91SAM9261S, and measurement module can not be controlled SPICLK signal wire.The sequential of whole transmitting procedure is controlled by AT91SAM9261S completely, and when there is no clock saltus step, the SPI of measurement module cannot transmit data.Again because the DOL Data Output Line of AT91SAM9261S and the Data In-Line of measurement module are connected, the Data In-Line of AT91SAM9261S is connected with the DOL Data Output Line of measurement module, measurement module input data while being also AT91SAM9261S output data, measurement module output data during AT91SAM9261S input data.For make AT91SAM9261S and measurement module with consistent effective edge along communication, polarity between the two should be configured to contrary polarity.So the SPI clock module of AT91SAM9261S is configured to the rising edge without phase delay, the SPI clock module of measurement module is configured to the negative edge pattern without phase delay.
Sum up, the multiloop electric energy quality on-line monitoring device based on ARM and DSP the utility model proposes has the following advantages:
1) on-Line Monitor Device can be monitored the quality of power supply of 1~6 monitoring point simultaneously, and it is also more succinct that it has significantly reduced monitoring device cost, the device space of greatly having saved transformer station, external cabling.
2) adopt embedded design---embedded microprocessor, embedded OS.
3) possess Ethernet interface, networking capability easily can be provided.

Claims (9)

1. the multiloop electric energy quality on-line monitoring device based on ARM and DSP, is characterized in that, comprising:
One or more measurement modules, for the power network signal of sampling, and carry out the data computing that the quality of power supply is relevant;
An ARM module, is connected with measurement module, is the control core of this on-line measuring device, the data interaction of control survey module and ARM intermodule, and external communication interface is provided;
A power module, for to measurement module and ARM module for power supply.
2. the multiloop electric energy quality on-line monitoring device based on ARM and DSP as claimed in claim 1, is characterized in that:
Described measurement module comprises one or more pairs of voltage transformer (VT) summation current transformers; The output termination AD modular converter of voltage transformer (VT) summation current transformer, AD modular converter is connected with DSP module;
The output terminal of voltage transformer (VT) also connects DSP module by a phaselocked loop, and phaselocked loop, for Tracking Frequency of Power Grids, makes the sampling rate of AD modular converter adapt to mains frequency;
DSP module is connected with ARM module.
3. the multiloop electric energy quality on-line monitoring device based on ARM and DSP as claimed in claim 2, is characterized in that:
Measurement module specifically comprises three pairs of voltage transformer (VT) summation current transformers, for monitor three-phase voltage and three-phase current simultaneously.
4. the multiloop electric energy quality on-line monitoring device based on ARM and DSP as claimed in claim 2 or claim 3, is characterized in that:
AD modular converter mainly consists of AD conversion chip AD73360L.
5. the multiloop electric energy quality on-line monitoring device based on ARM and DSP as claimed in claim 4, is characterized in that:
The front end of AD modular converter is provided with single order RC low-pass filter, the input termination voltage transformer (VT) of RC low-pass filter or the output terminal of current transformer.
6. the multiloop electric energy quality on-line monitoring device based on ARM and DSP as claimed in claim 5, is characterized in that:
DSP module mainly consists of dsp processor TMS320F2812.
7. the multiloop electric energy quality on-line monitoring device based on ARM and DSP as claimed in claim 6, is characterized in that:
The interface of AD conversion chip AD73360L and dsp processor TMS320F2812 is specially:
The MCLKXA end of the SCLK termination TMS320F2812 of AD73360L and MCLKRA end; The SDIFS end of AD73360L and the MFSXA end of SDOFS termination TMS320F2812 and MFSRA end; The MDXA end of the SDI termination TMS320F2812 of AD73360L; The MDRA end of the SDO termination TMS320F2812 of AD73360L; The RESET end of AD73360L and the GPIO14 end of SE termination TMS320F2812.
8. the multiloop electric energy quality on-line monitoring device based on ARM and DSP as claimed in claim 6, is characterized in that:
ARM module comprises an ARM9 micro controller AT91SAM9261S and an ethernet controller; Between the dsp processor TMS320F2812 of ARM9 micro controller AT91SAM9261S and each measurement module, adopt SPI interface communication; Ethernet controller provides Ethernet interface.
9. the multiloop electric energy quality on-line monitoring device based on ARM and DSP as claimed in claim 8, is characterized in that:
ARM9 micro controller AT91SAM9261S is used the slave of serial time clock line SPICLK, main frame input/slave output data line SPIMISO, main frame output/slave input data line SPIMOSI, Low level effective to select line SPISTE to connect each measurement module, and AT91SAM9261S only allows to enable a measurement module at any one time.
CN201420403056.7U 2014-07-21 2014-07-21 Multiloop electric energy quality on-line monitoring device based on ARM and DSP Active CN203965545U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104101806A (en) * 2014-07-21 2014-10-15 国家电网公司 ARM and DSP based multi-circuit power quality online monitoring device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104101806A (en) * 2014-07-21 2014-10-15 国家电网公司 ARM and DSP based multi-circuit power quality online monitoring device

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