CN205562705U - Monitoring system for power quality - Google Patents
Monitoring system for power quality Download PDFInfo
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- CN205562705U CN205562705U CN201620305762.7U CN201620305762U CN205562705U CN 205562705 U CN205562705 U CN 205562705U CN 201620305762 U CN201620305762 U CN 201620305762U CN 205562705 U CN205562705 U CN 205562705U
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Abstract
The utility model provides a monitoring system for power quality, this system includes singlechip, data acquisition module, external memory, serial interface and voltage source, the singlechip is connected with data acquisition module, external memory, serial interface and voltage source respectively, data acquisition module includes sampling retaining module, voltage transformer, current transformer, filter module and phase -locked loop module, sampling retaining module connects filter module, filter module respectively with voltage transformer and current transformer, sampling retaining module is connected to the phase -locked loop module, the phase -locked loop module is connected between filter module and sampling retaining module through the comparator again. The utility model discloses not only having data acquisition, solution, memory function, still having the information technology of complete system's report and sharing, utilize distributed system, disperse to merge into an unified whole at the on -the -spot analytic system of collection and the information network of every transformer substation, the cooperation finishes the electric energy quality operation of whole process and studies.
Description
Technical field
This utility model relates to a kind of mass monitoring system, is specifically related to a kind of electric energy quality monitoring system.
Background technology
Currently, market economic system gradual perfection, national economy high speed development, people start more attention to be placed on electric energy.We, when the quality of power supply being carried out monitoring, sampling and study, formulate part and improve quality of power supply method, so can improve the quality of power supply.
Summary of the invention
According to the deficiencies in the prior art, it is provided that when quality of power supply implementation is monitored, sampled and study by one, improve the electric energy quality monitoring system of the quality of power supply.
This utility model is realized by techniques below scheme:
A kind of electric energy quality monitoring system, this system includes that single-chip microcomputer, data acquisition module, external memory storage, serial line interface and voltage source, described single-chip microcomputer are connected with data acquisition module, external memory storage, serial line interface and voltage source respectively；Described data acquisition module includes that sampling keeps module, voltage transformer, current transformer, filtration module and phase-locked loop module；Described sampling keeps module to connect filtration module, described filtration module respectively with voltage transformer summation current transformer, described phase-locked loop module connects sampling and keeps module, and described phase-locked loop module is connected to filtration module further through comparator and sampling keeps between module.
Preferably, described single-chip microcomputer includes internal processor, a/d converter, dma controller, power interface and I/O port controller, described internal processor is connected with a/d converter, power interface, I/O port controller, dma controller respectively, and described dma controller is connected with a/d converter, I/O port controller the most respectively.
Preferably, described single-chip microcomputer uses C8051F064 single-chip microcomputer.
Preferably, described serial line interface uses RS485 serial line interface.
Preferably, the a/d converter that described a/d converter uses resolution to be more than 14.
Preferably, described voltage transformer uses the voltage transformer of SPT204 current type.
Preferably, described current transformer uses SCT254FK current transformer.
This utility model beneficial effect:
This utility model not only has data collection, solves, stores function, also there is complete System Reports and the Information technology shared, utilize distributed system, the on-site collection analysis system and the information network that are dispersed in each transformer station are merged into a unified entirety, and cooperation terminates quality of power supply computing and the research of whole process.
Accompanying drawing explanation
Fig. 1 is this utility model unit construction system block diagram；
Fig. 2 is data acquisition module system block diagram；
Fig. 3 is that voltage signal obtains circuit diagram；
Fig. 4 is that current signal obtains circuit diagram；
Fig. 5 is filter circuit schematic diagram；
Fig. 6 is sampling hold circuit schematic diagram；
Fig. 7 is principle of phase lock loop block diagram；
Fig. 8 is Zero-cross comparator circuit theory diagrams；
Fig. 9 is phase-locking frequency multiplication circuit schematic diagram；
1 single-chip microcomputer, 1-1 internal processor, 1-2 a/d converter, 1-3 dma controller, 1-4 power interface, 1-5 I/O port controller, 2 data acquisition modules, 2-1 sampling keeps module, 2-2 voltage transformer, 2-3 current transformer, 2-4 filtration module, 2-5 phase-locked loop module, 2-6 comparator, 3 external memory storages, 4 serial line interfaces, 5 voltage sources.
Detailed description of the invention
Below in conjunction with accompanying drawing, by specific embodiment, this utility model is further described.
As shown in Figure 1 and Figure 2, a kind of electric energy quality monitoring system, this system includes single-chip microcomputer 1, data acquisition module 2, external memory storage 3, serial line interface 4 and voltage source 5, and single-chip microcomputer 1 is connected with data acquisition module 2, external memory storage 3, serial line interface 4 and voltage source 5 respectively；Data acquisition module 2 includes that sampling keeps module 2-1, voltage transformer 2-2, current transformer 2-3, filtration module 2-4 and phase-locked loop module 2-5；Sampling keeps module 2-1 to connect filtration module 2-4, filtration module 2-4 respectively with voltage transformer 2-2 summation current transformer 2-3, phase-locked loop module 2-5 connects sampling and keeps module 2-1, and phase-locked loop module 2-5 is connected to filtration module 2-4 further through comparator 2-6 and sampling keeps between module 2-1.Single-chip microcomputer 1 includes internal processor 1-1, a/d converter 1-2, dma controller 1-3, power interface 1-4 and I/O port controller 1-5, internal processor 1-1 is connected with a/d converter 1-2, power interface 1-4, I/O port controller 1-5, dma controller 1-3 respectively, and dma controller 1-3 is connected with a/d converter 1-2, I/O port controller 1-5 the most respectively.Single-chip microcomputer 1 uses C8051F064 single-chip microcomputer.Serial line interface 4 uses RS485 serial line interface.
The a/d converter that a/d converter 1-2 uses resolution to be more than 14, because the figure place that A/D converts both can embody the size of quantitative differences, can represent again precision and the resolution of conversion.And overtone order is the highest in electric power networks, its fundametal compoment is the lowest.Voltage transformer 2-2 uses the voltage transformer of SPT204 current type.Current transformer 2-3 uses SCT254FK current transformer.
Wherein a/d converter 1-2 and the collection of the complete paired data of dma controller 1-3 and storage.Voltage is collected in 0-3.3 V, within the protection circuit of collection port guarantees that flowing into AINO voltage ratio flows into big 3.3 V of AINOG voltage.A/d converter 1-2 is after having collected a numerical value, dma controller 1-3 carries out fast storage to it, after numerical value storage is saturated, it is input to computer through serial communication interface dissect, when voltage is 3.3V, single-chip microcomputer 1 just action, but the operation voltage of computer collection port is 5V, and at this moment we need a RS485 serial interface chip.After system power-on reset, perform logarithm value by the order of computer and be collected, transmit and storage etc..In order to the reference voltage preventing the AD conversion of single-chip microcomputer 1 is unstable, also for the various impacts reduced within device, use two living 3.3V reference power supplies, it is ensured that numeral and simulation power transmission respectively.
As it is shown on figure 3, gather voltage signal to use the voltage transformer of SPT204 current type, the voltage flow to carries out current limliting by resistance R1, and the rated current on so former limit of this type voltage transformer is 2mA, and secondary current is the same.Operational amplifier function, the value changing feedback resistance R2 obtains the output voltage of requirement at outfan.In figure, the supply voltage of operational amplifier should take ± 12V.In figure, the precision of feedback resistance R2 and current-limiting resistance R1 should be more than one of percentage.
As shown in Figure 4, gathering current signal and use SCT254FK current transformer, the rated current entered is 5A, and the electric current that secondary obtains is 2.5mA.Operational amplifier function, the value changing feedback resistance R3 obtains the output voltage of requirement at outfan.
Collect on ac bus and in the information obtained, do not only have large energy fundamental frequency, also there is higher hamonic wave signal.Before flowing into ADC sampling, need low pass filter to filter in information and contain higher hamonic wave.Need under the smart that should perform in view of native system and actual conditions to monitor a lot of virtual informations, comprise A, B, C three-phase voltage and electric current, each numerical value can obtain through sampled operational, for the purpose of improving precision, each periodic sampling 128 point, utilizes 6.4KHZ sample frequency, and analysis can obtain 31 subharmonic, by Anti-aliasing Filter Circuits, the desirable harmonic wave that must be more than 32 times.As it is shown in figure 5, be the preposition subfilter of input voltage, crucial performance filters out the effect of multiple harmonic.Use 6 rank wave filter can increase single order low pass subfilter and reduce speed.
According to above it is understood that the harmonic wave of more than 31 times should be filtered out, but the harmonic wave within fact we should measure 21 times, then can be taken as 1050Hz.
As shown in Figure 6, virtual switch, memory device and buffer amplifier collectively form sampling hold circuit.When extracting sample, low level is the digital information on virtual switch.At this moment virtual switch energising, two polygonal voltages UB of capacitor are and then collected UA and change.When the sampling interval stops, D becomes high level, and virtual switch is not turned on, and UB then rests on shutoff instant numerically.The function of buffer amplifier is to be enlarged the signal gathered, and it has two basic connected modes on circuit: one is first to expand signal to store again, and another is first to store to expand again.Sampling hold circuit under normal circumstances, we require that switch is fixing and control information can be followed at any time to start working, the impedance turned off should be infinitely great, the voltage of analogue signal can be tracked rapidly by we with greater need for the voltage of memory device, ensures data not variation in infinite duration simultaneously.
Converted A/D just can be flowed to after sampling holder by the signal of filtering, the signal intensity lasting time is become the pulse signal that a series of time is the most lasting.In addition, sample frequency f needs to meet the half not less than highest frequency fmax, and sample information just can uniquely reappear prime information.LF398 constitutes the sampling hold circuit of this device.LF398 is a kind of feedback-type sampling/hold amplifier, constitutes and is divided into input buffer stage, out drive stage and control circuit.
LF398 uses as a simple amplifier, and DC current gain precision is 0.002%, and sampling t is 0.01% less than precision during 6 microsecond;The change flowing into offset voltage to be carried out at 2 feet, and in the condition not reducing deviation I, bandwidth allows 1MHz, and its technical conditions are: running voltage :+5v+18v；Sampling time: < 10us；Can be compatible with TTL, PMOS, CMOS；When holding capacitor is 0.01uF, holding step-length is 0.5mV；
Under sample states, high power supply controls.
As it is shown in fig. 7, the non-manual domination that phase-locked control i.e. phase angle is carried out simultaneously, it is achieved the non-manual domination device that double signal of telecommunication phase angles are carried out simultaneously is exactly phaselocked loop.Phaselocked loop is a kind of non-open loop feedback domination device, it is ensured that the output of phaselocked loop and contrast signal therein maintain corresponding phase angle responsibility.
As shown in Figure 8, be can be used as the input information of PLL by the information by the change of sine order after low pass filter, filtered information second time flows into low pass filter, then flows into zero-crossing comparator, can increase the quality of information measured.By before and after the regular waveform of the dutycycle that zero-crossing comparator is 1/2 along embody sinusoidal shape information+,-cross zero position.Owing in place's circuits, front filter circuit can disturb, its dutycycle of the shape information of outflow not 1/2nd.Via CD4046 and CD4040 phase-locked after, the information being sent to observation circuit is the waveform of dutycycle 1/2, adds the accuracy of signal further work.
As it is shown in figure 9, in order to each power frequency period waveform can gather 128 points, simultaneously need to these 128 o'clock inside a process, it may be assumed that the 1st of requirement sampling is the startup of a cyclic process, and rearmost point is completing of a cyclic process.In figure, information is input to AIN by after sensor collection and processing, voltage controlled oscillator flows out information VCOUT by feeding back to comparative information input side BIN after 4040 frequency dividings, information after phase demodulation flows out from PC2 via phase angle contrast device, low-pass filtering flows into voltage controlled oscillator VCIN again after having analyzed this information, voltage controlled oscillator flows into the electric capacity between information and CB, CA and the R on resistance 1 pin has ensured outflow frequency of information.In order to the outflow frequency of information after ensureing by 128 frequencys multiplication is 6.4KHZ, it is necessary to choose suitable R and C.Foregoing circuit by rights completes the collection frequency non-manual real-time supervise and examine to power frequency information, it is ensured that each process sampling 128 point, makes collection frequency reach 128f0(wherein f0It is power frequency).This not only ensure that Sampling Theorem, has also ensured the needs of synchronized sampling, it is achieved that sampling time and retention time asynchronous needs, converts to ADC and leaves the abundant moment.
Claims (7)
1. an electric energy quality monitoring system, it is characterized in that: this system includes single-chip microcomputer (1), data acquisition module (2), external memory storage (3), serial line interface (4) and voltage source (5), described single-chip microcomputer (1) is connected with data acquisition module (2), external memory storage (3), serial line interface (4) and voltage source (5) respectively；
Described data acquisition module (2) includes that sampling keeps module (2-1), voltage transformer (2-2), current transformer (2-3), filtration module (2-4) and phase-locked loop module (2-5)；Described sampling keeps module (2-1) to connect filtration module (2-4), described filtration module (2-4) respectively with voltage transformer (2-2) summation current transformer (2-3), described phase-locked loop module (2-5) connects sampling and keeps module (2-1), and described phase-locked loop module (2-5) is connected to filtration module (2-4) further through comparator (2-6) and sampling keeps between module (2-1).
A kind of electric energy quality monitoring system the most according to claim 1, it is characterized in that: described single-chip microcomputer (1) includes internal processor (1-1), a/d converter (1-2), dma controller (1-3), power interface (1-4) and I/O port controller (1-5), described internal processor (1-1) is connected with a/d converter (1-2), power interface (1-4), I/O port controller (1-5), dma controller (1-3) respectively, and described dma controller (1-3) is connected with a/d converter (1-2), I/O port controller (1-5) the most respectively.
A kind of electric energy quality monitoring system the most according to claim 1, it is characterised in that: described single-chip microcomputer (1) uses C8051F064 single-chip microcomputer.
A kind of electric energy quality monitoring system the most according to claim 1, it is characterised in that: described serial line interface (4) uses RS485 serial line interface.
A kind of electric energy quality monitoring system the most according to claim 2, it is characterised in that: the a/d converter that described a/d converter (1-2) uses resolution to be more than 14.
A kind of electric energy quality monitoring system the most according to claim 1, it is characterised in that: described voltage transformer (2-2) uses the voltage transformer of SPT204 current type.
A kind of electric energy quality monitoring system the most according to claim 1, it is characterised in that: described current transformer (2-3) uses SCT254FK current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620305762.7U CN205562705U (en) | 2016-04-13 | 2016-04-13 | Monitoring system for power quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620305762.7U CN205562705U (en) | 2016-04-13 | 2016-04-13 | Monitoring system for power quality |
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| CN205562705U true CN205562705U (en) | 2016-09-07 |
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| CN201620305762.7U Expired - Fee Related CN205562705U (en) | 2016-04-13 | 2016-04-13 | Monitoring system for power quality |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106933148A (en) * | 2017-03-22 | 2017-07-07 | 武汉理工大学 | Electrical Propulsion Ship real-time monitoring system based on PIC single chip microcomputer and DSP |
| CN110579667A (en) * | 2019-10-22 | 2019-12-17 | 李玉玲 | Power system analysis method |
| CN111521863A (en) * | 2020-04-07 | 2020-08-11 | 上海帆声图像科技有限公司 | Signal output and detection precision optimizing system |
-
2016
- 2016-04-13 CN CN201620305762.7U patent/CN205562705U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106933148A (en) * | 2017-03-22 | 2017-07-07 | 武汉理工大学 | Electrical Propulsion Ship real-time monitoring system based on PIC single chip microcomputer and DSP |
| CN110579667A (en) * | 2019-10-22 | 2019-12-17 | 李玉玲 | Power system analysis method |
| CN111521863A (en) * | 2020-04-07 | 2020-08-11 | 上海帆声图像科技有限公司 | Signal output and detection precision optimizing system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160907 Termination date: 20170413 |