CN105471102A - Method for monitoring electric energy quality of power supply network, electric energy quality field device and electric energy quality system - Google Patents

Method for monitoring electric energy quality of power supply network, electric energy quality field device and electric energy quality system Download PDF

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Publication number
CN105471102A
CN105471102A CN201510931010.1A CN201510931010A CN105471102A CN 105471102 A CN105471102 A CN 105471102A CN 201510931010 A CN201510931010 A CN 201510931010A CN 105471102 A CN105471102 A CN 105471102A
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China
Prior art keywords
field device
power quality
measured value
power supply
quality field
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CN201510931010.1A
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Chinese (zh)
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房国志
顾星志
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Harbin University of Science and Technology
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Harbin University of Science and Technology
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Priority to CN201510931010.1A priority Critical patent/CN105471102A/en
Publication of CN105471102A publication Critical patent/CN105471102A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
    • H02J13/00009—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission using pulsed signals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission

Abstract

In order to monitor electric energy quality of a power supply network with relatively low overhead by using an electric energy quality field device, the invention proposes a method for monitoring the electric energy quality in the power supply network. The method comprises the following steps of: acquiring a first measurement value of a first electric energy quality feature parameter by a measurement apparatus (11) of the electric energy quality field device (10, 50) arranged in a measurement position of the power supply network at a first measurement moment; acquiring a second measurement value of the first electric energy quality feature parameter by the measurement apparatus (11) at a second measurement moment after the first measurement moment; comparing the first and second measurement values with at least one pre-given threshold; and when one of the two measurement values is higher than the at least one threshold and one of the two measurement values is lower than the at least one threshold, generating an event signal indicating that the at least one threshold is destroyed. The invention furthermore relates to the electric energy quality field device for implementing such method, and an electric energy quality system.

Description

Monitor the method for the power supply network quality of power supply, power quality field device and power quality system
Technical field
The present invention relates to electric energy quality monitoring method, power quality field device and the power quality system in a kind of power supply network.
Background technology
Current power supply network is the network of the high complexity for distributing electric energy, usually has a large amount of energy feed-ins and energy ezpenditure.Except Supply Security, that is, ensureing that each moment to provide each energy user outside the electric energy of q.s, the quality (hereinafter referred to as " quality of power supply ") of the electric energy provided also plays critical effect.The quality of power supply in power supply network such as by so-called quality of power supply characteristic parameter as frequency, voltage and voltage harmonic or current harmonics, distortion factor, flicker, asymmetrical voltage and power are determined.Highly sensitive electric equipment requires the electric power supply of the form of the pure sine wave as far as possible with consistent frequency and amplitude at present.In standard network is as EN50160 or IEC61000, define higher limit and lower limit thus, the quality of power supply characteristic parameter of power supply network must be within these values.
In order to the quality of power supply can be represented, be provided with the power quality field device of the measured value recording each quality of power supply characteristic parameter in the different measuring position of power supply network.Usually recorded measured value can be stored for file in power quality field device.In order to whether analysis to measure value has exceeded boundary value in the specific moment, by stored measured value with regular be transferred at intervals to other data processing equipment such as central analysis computer to analyze.Therefore the change depending on the time of quality of power supply characteristic parameter and the maintenance of inspection or proof boundary value can be produced in central analysis computer.
Because the data memory module be configured in power quality field device can not be chosen as large arbitrarily due to cost reason, so the measured value stored must carry out to the transmission of central analysis computer related frequency.If stored measured value can not be transmitted in time, then because data storage is full of completely, no longer can store new measured value or old measured value and be covered (so-called " annular storage operation ") by new measured value.Therefore in this case expand the time interval between twice transmitting procedure, corresponding larger data storage must be set in power quality field device.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of method, power quality equipment and power quality system for monitoring the power supply network quality of power supply, thus can with the monitoring of relatively little expense realization to the quality of power supply.
With regard to method, above-mentioned technical problem is solved for monitoring the method for the quality of power supply in power supply network by a kind of, wherein carries out following steps:
-measure first the moment to gather the first quality of power supply characteristic parameter the first measured value by the measurement mechanism of the power quality field device arranged on the measuring position of power supply network;
-and then first measuring second of the moment and measuring the moment to gather this first quality of power supply characteristic parameter the second measured value by the measurement mechanism of power quality field device;
-threshold value given in advance to the first and second measured values and at least one is compared, and
-when in two measured values is arranged on this at least one threshold value and when one of two measured values is positioned under this at least one threshold value, produce and show the event signal destroying this at least one threshold value.
The major advantage of the inventive method is, carried out the quality of power supply state of power supply network by power quality field device first analyzes, thus will the measured value of all collections all not be stored in the data storage of power quality field device in order to analysis subsequently, but only produce event signal to when being known threshold value power quality field device destroying at least one.Required memory capacity and cost related to this obviously can be reduced thus with regard to power quality field device.
According to the advantageous extension of the inventive method, event signal is used for the optical signalling device controlling power quality field device.By this way can directly on power quality field device display threshold destroy (Schwellenwertverletzung).Carry out the light-emitting diode shown when this display unit can be such as only generation threshold value destruction, or give the display (such as LCD) of the additional information about destroyed threshold value.
According to another preferred implementation of the inventive method, event signal impels the control device of power quality field device to produce electronic message, and this electronic message comprises the data group of the threshold value that at least one shows to be destroyed.Produce the warning of electronic message form thus, this warning is supplied to the operating personnel of power supply network with the information about destroyed threshold value.Out of Memory can also be comprised in this external electronic message, the mark (such as production number) of such as power quality field device, operating personnel can by corresponding uniquely with specific power quality field device and corresponding uniquely with the particular measurement position in power supply network thus for threshold value destruction thus.
In addition, related to thisly, electronic message also preferably comprises and shows that the first measurement moment and/or second measures the data group in moment.Can threshold value be destroyed corresponding uniquely with a moment thus.
There is advantage for this reason, electronic message also comprise about destroyed threshold value be due to exceed or due to lower than and destroyed information.The direction that threshold value is destroyed can be provided thus.
In addition electronic message can also comprise the first and/or second measured value.The more detailed analysis that threshold value is destroyed can also be carried out thus, because can also determine to exceed threshold value or the degree lower than threshold value by measured value.
For this reason preferably electronic message to be stored in the fixed data memory of power quality field device, and/or to be transferred to the data processing equipment of the higher level being arranged on power quality field device.Therefore operating personnel can when transmitting electronic message directly by the data processing equipment being arranged on higher level, or pass through when electronic message is stored in power quality field device to read and visit data text from fixed data memory.In power quality field device, store electronic message compared with all measured values of storage, required memory capacity obviously reduces.
According to another preferred implementation of the inventive method, event signal impels the control device of power quality field device the first measured value and/or the second measured value to be stored in the fixed data memory of power quality field device.Only store such two measured values at this, threshold value occurs between these two measured values and destroys.Therefore compared with storing with continuous print data, in fixed data memory, store obviously few measured value, thus make memory span enough for obviously longer Measuring Time.
According to the preferred development of the inventive method, except measured value, also the first and/or second measurement moment was stored in fixed data memory.Can determine uniquely when analyzing the measured value that store thus, which moment there occurs threshold value in and to destroy.
According to another preferred implementation of the inventive method, the clock of the clock generator of power quality field device (50) collecting device inside, and the measurement moment determining each measured value according to this clock.Therefore can distribute a so-called timestamp to each measured value by simple mode.
As particularly preferred execution mode, power quality field device can also gather external clock, and determines the measurement moment of each measured value according to this external clock.By arranging external clock, the namely clock (such as gps time signal) of device external generation at the scene, the measured value of multiple power quality field device can be compared mutually better, because each power quality field device is synchronous with other power quality field device in time.Measurement moment of only being determined by external clock with one of each measured value is corresponding thus, and it is also definitely effective for being engraved in during this measurement in other power quality field device.
In addition according to another preferred implementation of the inventive method, except the measured value of the first quality of power supply characteristic parameter, also gather the measured value of at least another quality of power supply characteristic parameter, and when the measured value of this at least two times upper next-door neighbour of another quality of power supply characteristic parameter is positioned at the not homonymy of at least another threshold value, produce another event signal.Power quality field device can be utilized by this way to carry out complete analysis to relevant quality of power supply characteristic parameter.
Finally, according to the preferred implementation of the inventive method, event signal also impels control device to implement other quality of power supply function of power quality field device.The time period that this such as can impel power quality field device to define by event signal records additional measured value, namely produce so-called failure logging (Stoerschriebe), according to this record can accurately be illustrated in threshold value destroy before and after the measurement variation of quality of power supply characteristic parameter.Such failure logging can be stored in the fixed data memory of power quality field device or be transferred to the data processing equipment being arranged on higher level.Except setting up failure logging, such as can also by the sample rate of event signal raising for recording measured value.
With regard to power quality field device, above-mentioned technical problem is solved by a kind of power quality field device according to the present invention, this power quality field device has measurement mechanism for gathering measured value and control device, this control device is configured to, threshold value given in advance to gathered measured value and at least one is compared, and when two next-door neighbour measured value in one exceed and one lower than this at least one threshold value time, produce event signal.The state of the quality of power supply of power supply network is analyzed thus.The data volume for this reason stored in fixed data memory can reduce compared with storing with continuous print data significantly, because only produce event signal.
Power quality field device preferably can arrange the display unit (light-emitting diode, display) that can be activated by event signal.
According to the preferred development of power quality field device of the present invention, have communicator, it will represent that the electronic message of destroyed threshold value is sent to the data processing equipment being arranged on power quality field device higher level when there is event signal.The memory location in power quality field device can be saved by sending immediately of electronic message.
Power quality field device preferably has fixed data memory for this reason, and the data group at least one being provided destroyed threshold value by control device when there is event signal is stored in this memory.The memory capacity of power quality field device is also saved compared with storing with continuous data in this expansion.
Control device is also preferably configured to the function of the assembly performing protection power supply network.The combination of power quality field device and proterctive equipment in this case.Therefore can arrange on the whole than the power quality field device used separately and the less field apparatus for power supply network of proterctive equipment quantity.The quality of power supply function of the field apparatus combined in this case in addition and defencive function can be sampled same measurement input, thus only need a small amount of measurement instrument transformer.
According to another preferred implementation of field apparatus of the present invention, it has the clock generator being configured to the device interior producing clock, and control device is configured to the measurement moment determining the measured value of each collection according to this clock.Therefore can distribute a timestamp to each measured value by simple mode.
According to the particularly preferred execution mode of power quality field device of the present invention, power quality field device has the receiving system for receiving external clock, and control device is configured to the measurement moment determining the measured value of each collection according to received external clock.By this way power quality field device can by measured value with only depend on external clock and in the miscellaneous equipment receiving same clock, also also have measurement moment of validity thus corresponding.Receiving system is preferably gps receiver.
Multiple such power quality field device can form power quality system with central data processing unit (these power quality field devices are connected with this central data processing unit through data communication network).
Accompanying drawing explanation
Below in conjunction with embodiment, the present invention is described.For this reason in the accompanying drawings:
Fig. 1 shows the first embodiment of power quality field device with schematic block diagram,
Fig. 2 shows the method flow diagram of the method for the quality of power supply explained for monitoring power supply network,
Fig. 3 shows the first figure of the exemplary variations of measured value,
Fig. 4 shows the second figure of the second exemplary variations of measured value,
Fig. 5 shows the second embodiment of power quality field device, and
Fig. 6 shows the power quality system comprising multiple power quality field device.
Embodiment
Fig. 1 illustrates power quality field device 10 with high-level schematic.Power quality field device 10 has measurement mechanism 11, and it has measurement input 12a, 12b and 12c for recording measured value.The measurement mechanism 11 of power quality field device 10 is connected with control device 13 at outlet side, and control device 13 is connected with fixed data memory 14 in outlet side.Fixed data memory is interpreted as such data storage at this, and it is such as contrary with volatile data memory, is suitable for continuing to store data.At this, can be so-called permanent data storage, such as, without the need to ensureing that the data continued store, flash memory or hard disk from outside supply energy.But fixed data memory also can be understood as volatile data memory in the present invention, it is through exterior source of energy supply of electrical energy, thus the duration data till can realizing calling at least in the volatile data memory of energy buffer stores.
The control device 13 of power quality field device 10 is also connected with communicator 15 for this reason, and this communicator sets up data cube computation through communication output 17 between power quality field device 10 and miscellaneous equipment.Although communication output is in FIG expressed as the data cube computation section that cable connects, instead also can be wireless data cube computation such as through radio or infrared ray, data can be sent to the receiving system of relative configurations through these connections.In addition, communicator 15 also can be such device, the data storage of outside (such as USB interface or the driver for optics or magnetic data storage medium) can be connected with power quality field device 10 by this device.
Control device 13 is connected with clock generator 18 in addition, the internal unit clock that such as quartz controls, and is supplied to control device with time pulse, can determines the measurement moment of each measured value recorded by measurement mechanism 11 by this time pulse.
Power quality field device 10 represents the field apparatus of the quality of power supply for monitoring power supply network assembly, one section of such as delivery of electrical energy wire, bus or transformer.
The power quality field device of usual routine records the measured value of quality of power supply characteristic parameter on each assembly, and these values is stored into continuously in conventional power quality field device.Because fixed data memory is for storing the measured value of limitation, so before the memory capacity exceeding fixed data memory, measured value stored therein must be read.Such readout directly can be carried out by such as floppy disk or USB rod in transmission measurement value to the movable data memory be connected with power quality field device temporarily on power quality field device.Also another data processing equipment can be transferred to by power quality field device through wired or wireless data transmission segment, such as central analysis computer as this measured value of replacement.
Because concerning interested especially the characteristic analyzing quality of power supply characteristic parameter be that those destroy the measured value of threshold value given in advance, so shown in Figure 1 power quality field device 10 when perform the method for the quality of power supply for monitoring power supply network described by the following Fig. 2 of quoting.
Shown in figure 2 in first step 21 at the measurement input of power quality field device 10, such as, at measurement input 12a, gather the first measured value M of the first quality of power supply characteristic parameter by measurement mechanism 11 1.First quality of power supply characteristic parameter can be such as the voltage gathered on the line segment of power supply network.Measurement input 12a again by measurement mechanism 11 in second step 22 subsequently gathers the and then first measured value M in time of the first quality of power supply characteristic parameter 1the second measured value M 2.These two the measured value M gathered 1and M 2be transferred to the control device 13 of power quality field device 10.
Control device 13 checks the first measured value M of record in step 21 according to step 23 subsequently 1whether be positioned at (M below threshold value S given in advance 1< S).If so, then in another step 24, check the second measured value M recorded in step 22 2whether be positioned at (M above threshold value S given in advance 2> S).If the control device 13 also, then by power quality field device 10 in last step 25 produces event signal ES.
If determined during inspection in step 23, the first measured value M 1not be positioned at below threshold value S given in advance, i.e. the first measured value M 1be positioned at above threshold value given in advance, then check in step 26 subsequently from now on, the second measured value M 2whether be positioned at (M below threshold value S given in advance 2< S).If so, then event signal ES is produced according to step 27 by the control device 13 of power quality field device 10.
If determined in step 24, the second measured value M 2not be positioned at (i.e. two measured value M above threshold value S given in advance 1and M 2all be positioned at below threshold value S given in advance), then do not produce event signal according to step 28.Same to the second measured value M determined according to step 26 2not be positioned at (i.e. two measured value M below threshold value S given in advance 1and M 2above the threshold value S being all positioned at regulation) situation, do not produce event signal according to step 29.
Step 21 is started again, at this by the second measured value M so far after each run of the method 2from now on as the first measured value M 1and gather new measured value M 2.
In order to prevent in measured value one or even two be just in time positioned at few situation of threshold value S, can not be with being greater than/less-than condition (such as M in step 23,24 and 26 1< S) but with being more than or equal to/being less than or equal to condition (such as M 1≤ S) check.
Such as can use by control device by measured value M 1and M 2the situation causing threshold value to destroy and the event signal ES that produces exports optical signalling to impel the optical display 19 of power quality field device 10, destroys the operating personnel being shown to power supply network by threshold value.Can be lamp or light-emitting diode as optical display in the simplest situations, but also can use display (such as LCD), display out of Memory (moment that such as threshold value is destroyed, the mark of threshold value) can also be destroyed to threshold value by display.
Event signal ES also may be used for impelling control device to produce the electronic message comprising the mark of the threshold value that at least one exceedes.The information also comprising other in addition in electronic message such as (gathers measured value M about the mark (such as unique production number) of power quality field device 10, the moment of threshold value destruction 1and M 2one or two measure moment), the direction destroyed of threshold value, that is, to be above or lower than threshold value or each measured value M 1and/or M 2itself.The part that can also comprise mentioned information in the electronic message produced by control device 13 is selected.
Electronic message such as can be transferred in the data processing equipment being arranged on higher level or the fixed data memory 14 being stored in power quality field device through communicator 15, so that the moment below reads therefrom.
Finally, event signal ES can also be used for impelling the first measured value M 1and/or the second measured value M 2be stored in the fixed data memory of power quality field device.
Event signal ES can also impel the combination of multiple above-mentioned action, namely such as generation electronic message and directly display optical signal on power quality field device.
Comprehensive, when using the method according to Fig. 2, always only having when in fact threshold value occurring and destroying, just producing event signal by the control device 13 of power quality field device 10.The control device 13 of power quality field device 10 is arranged in below threshold value according in two measured values and two measured values threshold value of understanding above being positioned at threshold value is destroyed.Therefore the change of store measurement values discontinuously in power quality field device.Exactly when event signal ES is used for impelling measured value M 1and M 2during storage in the fixed data memory 14 of power quality field device, compare with the storage of continuous print measured value and also save considerable memory space, because the data of only carrying out the event that depends on store.A small amount of measured value is effectively stored by this way in the fixed data memory 14 of power quality field device 10.Therefore the measured value stored in fixed data memory 14 is also only called from power quality field device 10 rarely comparatively speaking.
Except the first quality of power supply characteristic parameter, such as voltage, other quality of power supply characteristic parameter, such as electrical power and frequency can also be gathered on other measurement input 12b and 12c of the measurement mechanism 11 of power quality field device 10, these quality of power supply characteristic parameters are monitored those threshold values corresponding respectively to other threshold value of other each quality of power supply characteristic parameter according to the method shown in Fig. 2 and are destroyed, and only cause the generation of event signal ES when exceeding threshold value.Measuring transducer for measuring each measurement parameter can be set for this reason before each measurement input 12a to 12c.But it is also passable, measured value preliminary treatment is carried out in quality of power supply characteristic parameter 10, such as determine other quality of power supply characteristic parameter according to measured curent change and change in voltage, such as power and frequency, and be transferred to the measured value harvester 11 of power quality field device 10.
Power quality field device 10 also can be power quality field device and the proterctive equipment of combination.Such as electric protective equipment by measuring curent change and change in voltage and checking according to so-called protection algorism on each assembly; assembly is in the range of operation that whether allows or whether there is fault such as short circuit, and whether the assembly monitoring power supply network keeps running status given in advance.The assembly of power supply network is separated by disconnecting power switch from electrical network by electric protective equipment in case of a fault, and fault can not be proceeded on the remainder of power supply network.By by power quality field device with the function i ntegration of proterctive equipment to a single field apparatus in can avoid the setting of the costliness of proterctive equipment and the power quality field device usually separated.
The method described in fig. 2 is illustrated further below by the measurement variation shown in Fig. 3 and 4.
The voltage measuring value V of staircase curve form is illustrated in figure 3 in voltage-time graph 1to V 12change in time.
Why select staircase curve to describe, be because usually in power quality field device be not analyze quality of power supply characteristic parameter instantaneous value but analyze the mean value of this quality of power supply characteristic parameter, because instantaneous value may suffer fluctuation once in a while and occur spike in short-term or limiting value thus.That average duration normally can be arranged and such as from several milliseconds to one minute or even a few minutes or several hours.For Fig. 3 and 4, measured value is construed as the result through formation of corresponding average duration (such as 10 minutes) mean value.As the replacement to this, also can not form mean value, but the method that describes in fig. 2 implemented with these instantaneous measure to the instantaneous measure of the measurement moment record quality of power supply characteristic parameter continued.
In figure 3, first threshold S in addition 1with Second Threshold S 2the dotted line extended by being parallel to time shaft represents.Namely usual in the standard network to quality of power supply characteristic parameter specify a scope, quality of power supply characteristic parameter must be positioned at this scope, to ensure enough power supply qualitys.When leaving this scope, namely lower than lower threshold value S 1or exceed upper threshold value S 2when, power supply quality is considered as defective.
Consider measurement variation shown in Figure 3, can find out, the first voltage measuring value V 1with the second voltage measuring value V 2all be positioned at lower threshold value S 2above and be positioned at upper threshold value S 1below.The method that control device 13 (see Fig. 1) is implemented to describe in Fig. 2 with regard to this two voltage measuring values, and understand, at measured value V 1and V 2between to moment t 1not there is threshold value S 1or S 2go beyond.Therefore in the method process, event signal ES is not produced.
In this case can by voltage measuring value V 1abandon completely, and voltage measuring value V 2also must be retained the next process for the method described in Fig. 2.The control device 13 of power quality field device 10 is from now on regard to voltage measuring value V 2and V 3implement the method described in Fig. 2.Understand at this control device 13, voltage measuring value V 2be positioned at upper threshold value S 2below and voltage measuring value V 3be positioned at upper threshold value S 2above.In other words, at voltage measuring value V 2with voltage measuring value V 3between there is upper threshold value S 2go beyond.This causes, and the control device 13 of power quality field device 10 produces event signal ES.The existence of event signal ES such as can impel control device generation to show the electronic message that threshold value is destroyed, and this electronic message is transferred to the data processing equipment being arranged on higher level.In addition can by the second voltage measuring value V 2and/or tertiary voltage measured value V 3(if desired with corresponding measurement moment together) is stored in the fixed data memory 14 of power quality field device 10.
Fig. 2 describe method with regard to voltage measuring value V 3to V 7other process in the control device 13 of power quality field device 10 do not recognize threshold value and go beyond, because all voltage measuring value V 3to V 7all be positioned at upper threshold value S 2above.Therefore, in these processes of the method, event signal ES is not produced.
Until observe voltage measuring value V 7and V 8when control device 13 just recognize another threshold value and go beyond, and be the scope that change in voltage enters permission again.Produce event signal again in this case, this event signal is as explained above can trigger different actions.
Correspondingly the control device 13 of power quality field device 10 is at voltage measuring value V 9and V 10between and at voltage measuring value V 10and V 11between recognize lower threshold value S 1destruction, thus this produce event signal.
When considering the measurement variation shown in Fig. 3, can find out, 12 single voltage measuring values (measuring together with the moment with its each if desired) will be stored when Coutinuous store measured value for analysis subsequently.When the method using Fig. 2 to describe, only produce 4 event signals, these event signals such as impel the generation of 4 electronic messages.Consider so true time, namely, in the measurement variation of reality, seldom there will be threshold value than the measurement variation of hypothesis shown in Figure 3 destroy, therefore when event signal ES impel each voltage measuring value is stored in fixed data memory 14 time, the data volume stored itself obviously reduces.
The voltage measuring value V with such as Fig. 3 is illustrated in Fig. 4 1to V 12change similar in principle.Also be provided with another threshold value S in the diagram 3, checked the position of each measured value with regard to this threshold value by the control device 13 of power quality field device 10.Can by the analysis of gathered quality of power supply characteristic parameter (wherein specifying more than two threshold values) by the quantity improving threshold value like this, with matches criteria given in advance, or the resolving power of produced event signal ES can be improved, because produce thus (but also more specifically) event signal frequently.Therefore by introducing another threshold value in the diagram, not now generation 4 event signal ES (situation of Fig. 3) but producing 6 event signal ES.As threshold value S 1to S 3in at least one when being exceeded between two measured values in succession, always produce event signal.
Fig. 5 illustrates another embodiment of power quality field device.Have and the structure similar according to the power quality field device of Fig. 1 according to the power quality field device 50 of Fig. 5, thus the identical Reference numeral of consistent assembly represents.According to the power quality field device 50 of Fig. 5 and the type of clock generator being only the measurement moment for determining each measured value according to the difference of the power quality field device 10 of Fig. 1.The clock generator 52 of the power quality field device 50 shown in Fig. 5 has the receiving system 51 that can receive external clock.According to the external clock received through receiving system 51, the clock generator 52 of the control device 13 of power quality field device 50 provides time pulse, accurately can determine the measurement moment of each measured value according to this time pulse about external clock.
Can be such as gps receiver (global positioning system) according to the receiving system 51 of Fig. 5 clock generator 52, this gps receiver receives the clock sent by the gps satellite 53 installed in orbit.The clock sent by gps satellite 53 is the high-precision clock of the frequency with a pulse per second.Each measured value can be measured the moment with the precision of such as microsecond range and each according to the control device 13 of this precision clock power quality field device 50 corresponding.Replace the gps receiver from gps satellite Received signal strength, other receiver being suitable for receiving the signal with the clock produced in power quality field device 50 outside can also be set.
Last Fig. 6 illustrates the system be made up of the power quality field device 61a to 61g on multiple line segment being arranged on the power supply network 62 only schematically shown.Power quality field device 61a to 61g correspondingly has the receiving system for receiving the external clock such as gps signal of gps satellite 53 with the expression of Fig. 5.Can reach by this way, all clock generators accurately synchronous operation in power quality field device 61a to 61g, and thus can be corresponding with the absolute measurement moment by the measured value gathered by power quality field device 61a to 61g, be engraved in remaining power quality field device 61a to 61g when these are measured and be also effective and can compare mutually thus.In other words, ensure by this way, (this measured value is matched by the control device of power quality field device 61b and measures moment t the measured value recorded in power quality field device 61b 1) be recorded with the measured value that another gathers in power quality field device 61f that (this measured value measures moment t by same the matching of the control device of power quality field device 61f simultaneously 1).If do not use external clock to all power quality field device 61a to 61g, then can not provide accurate explanation, the measurement moment t of field apparatus 61b owing to lacking synchronous between the clock generator of each power quality field device 61a to 61g 1with the t of field apparatus 61f 1whether in fact consistent.But in some cases, when the measured value to each power quality field device synchronous not have so high requirement, arrange as according to the high precision clock generator in the example of Fig. 1, be also enough.There is no outside clock so power quality system also can be configured to and there is no corresponding receiving system.
To be connected to each other through the communication conductor that dotted line represents according to Fig. 6 each power quality field device 61a to 61f and to be connected with anacom 64.Can by the content delivery of the data storage of each power quality field device 61a to 61g to anacom 64 through this communication conductor.Communication network can be such as Ethernet, wherein communicates according to industrial standard IEC61850.
Can judge all power quality field device 61a to 61g related in system scope with anacom 64 when there occurs the frequency that threshold value is destroyed and occurred.

Claims (10)

1. for monitoring a method for the power supply network quality of power supply, wherein, implement following steps:
-measure first the moment to gather the first quality of power supply characteristic parameter the first measured value by the measurement mechanism (11) of the power quality field device arranged on the measuring position of power supply network (10,50);
-and then this first is measured second of the moment and measures the moment to gather the first quality of power supply characteristic parameter the second measured value by the measurement mechanism (11) of power quality field device;
-threshold value given in advance with at least one for this first and second measured value is compared, and
-when in these two measured values higher than in this at least one threshold value and this two measured values lower than this at least one threshold value time, produce show the event signal destroying this at least one threshold value.
2. method according to claim 1, is characterized in that,
-described event signal is used for the optical signalling device controlling power quality field device.
3. method according to claim 1 and 2, is characterized in that,
-described event signal impels the control device of described power quality field device to produce electronic message, and wherein this electronic message comprises the data group that at least one provides destroyed threshold value.
4. method according to claim 3, is characterized in that,
-described electronic message also comprises and shows that the first measurement moment and/or second measures the data group in moment.
5. the method according to claim 3 or 4, is characterized in that,
-described electronic message also comprise about described destroyed threshold value be due to exceed or due to lower than and destroyed information.
6. the method according to any one of claim 3 to 5, is characterized in that,
-described electronic message also comprises the first measured value and/or the second measured value.
7. the method according to any one of claim 3 to 6, is characterized in that,
-described electronic message is stored in the fixed data memory of described power quality field device, and/or be transferred to the data processing equipment of the higher level being arranged on described power quality field device.
8. the method according to any one of the claims, is characterized in that,
-described event signal impels the control device of described power quality field device described first measured value and/or the second measured value to be stored in the fixed data memory (14) of described power quality field device.
9. method according to claim 8, is characterized in that,
-except described measured value, also described first measurement moment and/or the second measurement moment are stored in described fixed data memory (14).
10. the method according to any one of the claims, is characterized in that,
The clock of the clock generator of-described power quality field device (50) collecting device inside, and the measurement moment determining each measured value according to this clock.
CN201510931010.1A 2015-12-16 2015-12-16 Method for monitoring electric energy quality of power supply network, electric energy quality field device and electric energy quality system Pending CN105471102A (en)

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Application publication date: 20160406