CN102215100A - Virtual analog-to-digital conversion core device based on IEEE (Institute of Electrical and Electronic Engineers) 1588 Ethernet - Google Patents
Virtual analog-to-digital conversion core device based on IEEE (Institute of Electrical and Electronic Engineers) 1588 Ethernet Download PDFInfo
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Abstract
The invention provides a virtual analog-to-digital conversion core device which is used for acquiring data and providing the data for a primary device for control or protection. The core device comprises a virtual analog-to-digital conversion port. The core device sends target sampling data messages containing data which is sampled synchronously by the master clock of the primary device to the primary device by virtue of the virtual analog-to-digital conversion port. The virtual analog-to-digital conversion port comprises serial ports. According to the core device, the time synchronization is used for replacing straight line connection on hardware, thus reducing the cost of constructing a remote industrial control system greatly.
Description
Technical field
The present invention relates to a kind of core devices, relate in particular to a kind of virtual analog-to-digital conversion core devices that is applied to industry measurement and control system based on the IEEE1588 Ethernet.
Background technology
The TT﹠C system of commercial Application is commonly used to the data of scene operation are gathered, monitored, and by analysis, the statistics to sampled data, thereby takes corresponding strategy to realize control, protection or metering.Realize point-to-point connected in seriesly in traditional TT﹠C system between each equipment by cable, this can cause very high hardware cost undoubtedly, and causes a lot of troubles for long-range protection and control or System Expansion.Develop rapidly along with the computer chip and the network communications technology, traditional TT﹠C system has begun to use the network communications technology to realize the mutual of sampled data and has shared, hardware connects and the cost of maintenance thereby can significantly reduce, and has made things convenient for the dilatation of Long-distance Control and system.
With the transformer substation system is example, International Electrotechnical Commission (IEC) has issued the unified communication protocol IEC61580 agreement of the electric substation automation system of communication Network Based, according to this agreement, all data of transformer substation system and information can be transmitted and share by network.Transformer substation system can be divided into process layer, wall, substation level according to the IEC61580 standard.Wherein the process layer is mainly used in and finishes switching value and analog acquisition, and it comprises various primary equipments, as cable, electric wire, bus, switch, transformer, capacitor, current/voltage instrument transformer etc.; Wall comprises the various second protection measure and control devices that are used for monitoring, control, protecting primary equipment, i.e. intelligent electronic device (IED); Substation level is used for whole transformer station is carried out security monitoring, control, operation and carries out exchanges data with the transformer station outside, and it comprises the operator workstation (OWS) of (HMI) that has man-machine interface and to gateway of the network control center (NCC) etc.Transformer station's bus is used for communicating by letter between substation level and wall; Process bus is used for communicating by letter of wall and process interlayer.Several different message forms are arranged in the IEC61580 standard.Message for non-time-critical, IEC61580-8-1 has stipulated the manufacturing message specification (MMS based on the open system interconnection (OSI) of simplifying (OSI) protocol stack, ISO/IEC9506), wherein the osi protocol stack has transmission control protocol (TCP) and the Internet protocol (IP) that is in respectively in transport layer and the network layer, and IEC61580-8-1 stipulates that Ethernet and/or RS-232C are as physical medium.Message for time-critical based on incident; IEC61580-8-1 has stipulated directly to be in the transformer substation case towards general object (GOOSE) on the ethernet link layer of communication stack, and it is mainly used in the demanding transfer of data of real-time such as protection tripping operation, circuit breaker position, lock file.For at the periodically variable very apace signal of process layer, such as measure analog voltage or electric current, IEC61580-9-2 has stipulated the standard of sampled data (SMV) message, and it is the same as with GOOSE ethernet link layer.
The electronic mutual inductor of IEC61580 protocol requirement process layer can be converted into digital signal with analog quantitys such as the voltage once surveyed, electric currents, and is sent to wall; Substation level finish to the control of wall secondary device, process layer primary equipment in standing and with the communicating by letter of distant place control centre, engineer station and man-machine interface.For example; electronic current, voltage transformer have been gathered the three-phase current of high-voltage fence and the instantaneous signal of voltage; be processed into digital signal through A/D converter spare (ADC); and pass to merge cells by optical fiber; merge cells can be according to the demand of wall second protection control device with corresponding sampled data according to specific frame format group bag; send to the second protection control device by ethernet port, so that it carries out corresponding protection control strategy and Information Statistics according to the data that obtain.
In the Industry Control, need carry out strict clock synchronization to data and the protection measure and control device of gathering.Be connected can be from simulation instrument transformer synchronous acquisition data for second protection control device and A/D converter spare (ADC) the hardware straight line by " point-to-point " in the past; if but each secondary device all adopts this connected mode can significantly improve the construction cost of system undoubtedly; yet secondary device connects by Ethernet, and how to obtain synchronously sampled data by Ethernet from A/D converter spare (ADC) is that those skilled in the art want urgent problem.
Summary of the invention
The object of the present invention is to provide a kind of virtual analog-to-digital conversion core devices, it can provide virtual analog-to-digital conversion port, be used for sending and the synchronous sampled data of main equipment master clock to main equipment, thereby the straight line that exchanges for synchronously on the hardware by the time connects, and greatly reduces the cost that Remote Industrial Control System makes up.
For achieving the above object, a kind of virtual analog-to-digital conversion core devices of the present invention is used for image data, and offers and be used to the main equipment controlling or protect; This core devices comprises virtual analog-to-digital conversion port, core devices sends the target sampled data message comprise with the synchronous sampled data of the master clock of main equipment by this virtual analog-to-digital conversion port to main equipment, and described virtual analog-to-digital conversion port comprises serial port.
As a further improvement on the present invention, described virtual analog-to-digital conversion port also comprises ethernet port.
As a further improvement on the present invention, described ethernet port also is used for obtaining the sampled data message by the Ethernet of supporting the IEEE1588 agreement.
As a further improvement on the present invention, this core devices also comprises controller, and described controller is used to resolve described sampled data message to obtain sampled data, and and the synchronous current sampling time information of local clock of core devices.
As a further improvement on the present invention, this core devices also comprises distant place clock, and described distant place clock is realized the master clock backup of main equipment according to the IEEE1588 agreement.
As a further improvement on the present invention, described controller also is used for the described current sampling time is adjusted to the target sampling time synchronous with the master clock of main equipment.
As a further improvement on the present invention, the operation that described controller is adjusted into the target sampling time with the current sampling time comprises: backup obtains the time clock correction (△ t2) of master clock and local clock according to described master clock, and clock correction will be adjusted to the target sampling time (T2) synchronous with the master clock of main equipment with synchronous current sampling time (T1) of local clock when described.
Compared with prior art, the invention has the beneficial effects as follows: serial port has constituted virtual analog-to-digital conversion port, main equipment can obtain the sampled data synchronous with its master clock by this port, just directly obtains sampled data as the sata hard wiring by " point-to-point " from the analog-to-digital conversion device of reality.Though sampled data has been passed through multilevel device in transmission course, but because each equipment is realized interconnected by the Ethernet of supporting the IEEE1588 agreement, solved the problem of time synchronized, thereby the straight line that exchanges for synchronously on the hardware by the time connects, and greatly reduces the cost that Remote Industrial Control System makes up.。
Description of drawings
Fig. 1 is the operation principle block diagram of first execution mode of using the industry measurement and control system of core devices of the present invention.
Fig. 2 is the operation principle block diagram of second execution mode of using the industry measurement and control system of core devices of the present invention.
Fig. 3 is the operation principle block diagram of the 3rd execution mode of using the industry measurement and control system of core devices of the present invention.
Fig. 4 is the workflow diagram that core devices receives sampled data in the embodiment of the present invention from data acquisition unit.
Fig. 5 is the workflow diagram that core devices receives sampled data in the embodiment of the present invention from other core devices.
Fig. 6 is the workflow diagram that core devices extracted and sent corresponding data in the embodiment of the present invention according to the main equipment data command.
Fig. 7 is first execution mode of the storage of sampled data in the core devices among the present invention.
Fig. 8 is second execution mode of the storage of sampled data in the core devices among the present invention.
Fig. 9 is the operation principle block diagram of the 4th execution mode of using the industry measurement and control system of core devices of the present invention.
Embodiment
To be example with the transformer substation system below, each execution mode shown in describes the present invention in conjunction with the accompanying drawings.But need to prove; the application of core devices of the present invention is not limited in transformer substation system; other is any data acquisition, analysis, statistics that is suitable for commercial Application such as the monitoring of the magnitude of traffic flow and control for example, and control, protection system all are included in the protection range that core devices of the present invention uses.
Shown in Figure 1 is uses the operation principle block diagram of first execution mode of the industry measurement and control system of core devices of the present invention.Wherein, industry measurement and control system comprises data acquisition unit, the core devices of communicating by letter with data acquisition unit and the main equipment of communicating by letter with core devices.In the present embodiment, industry measurement and control system is a transformer substation system. Data acquisition unit 31,32 shown in the figure has two, but what those of ordinary skills can expect easily is, the sample requirement of the quantity viewing system of data acquisition unit and deciding, can have only one, also can be more, the quantity in this scope is limited to 12 on the data acquisition unit that common core devices connects, so all can receive.Data acquisition unit is used for the floor data of the on-the-spot operation of acquisition system, and in the present embodiment, data acquisition unit comprises electronic mutual inductor, can gather the operating data of different types of high-voltage fence, as voltage, electric current, temperature, humidity, pressure etc.; Also can gather the data of the different sample frequencys of same type, for example, corresponding respectively two sampling channel A of two current transformers that two data collectors 31,32 shown in the figure comprise and B, wherein the sampling standard of sampling channel A is: ripple (50Hz) sampling is 20000 times weekly, sample frequency is 50Hz * 20000=1MHz, and the sampling interval is 1/1MHz=1 μ s; The sampling standard of sampling channel B is: ripple (50Hz) sampling is 10000 times weekly, and sample frequency is 50Hz * 10000=0.5MHz, and the sampling interval is 1/0.5MHz=2 μ s.In the present embodiment, the data sampling type of each passage and sampling interval are pre-configured according to the sampling request of system, certainly in other embodiments, the sampling interval of passage also can be adjusted in the highest sampling interval of passage according to the instruction of main equipment.
In the present embodiment, data acquisition unit also comprises mould/number conversion chip (ADC), and the analog signal that is used for instrument transformer is collected is converted to digital signal after the modulate circuit conditioning.Also comprise IEC61580 agreement support package in mould/number conversion chip, can be used for digitized sampled data is carried out the encapsulation of respective frame form and formed the sampled data message according to the IEC61580 agreement, then send to core devices 10.Certainly, in other embodiments, mould/number conversion chip can be independent of the data acquisition unit setting; Perhaps mould/number conversion chip is arranged on core devices 10 sides, is promptly received the analog signal of sampled data and is converted to the data that meet the IEC61580 agreement by core devices 10.Can be the high-speed serial communication (port can be output of numeral electricity or digital light output) of " point-to-point " between data acquisition unit 31,32 and the core devices 10, also can realize communication by local area network (LAN).In the present embodiment, this local area network (LAN) is an Ethernet, comprises Ethernet switch, transmission cable (as optical cable, coaxial cable, twisted-pair feeder) and connection device etc.With regard to data traffic, can be standard ethernet, Fast Ethernet, gigabit Ethernet or even ten thousand mbit ethernets; With regard to topological structure, can be bus-type, also can be star-like.
In the present embodiment, core devices 10 is the combination of each functional module of being used to realize some Core Features in the merge cells, and concrete manifestation can combining for hardware unit, the instruction of carrying out on hardware unit or program or hardware and software program.This core devices is mainly used in reception and storage comes from the sampled data of data acquisition unit 31,32, and shares in transformer substation system, subscribes to for main equipment 21,22 or other core devices.Core devices 10 comprises controller 11, memory 12, sampled data port one 3 and ethernet port 14.Its middle controller 11 comprise various types ofly be used for executing instruction, the processor or the microprocessor of treatment progress or thread.In the present embodiment, controller comprises one or more microprocessors, PCI ethernet controller, high accuracy PHY chip etc., wherein microprocessor can comprise CPU (Central Processing Unit, CPU), the integrated circuit that also can comprise other form, as application-specific IC (Application Specific Integrated Circuits, ASIC) or field programmable gate array (Field-programmable Gate Array, FPGA) etc.Memory 12 can comprise the read-only memory static memories such as (ROM) of storing static information, with the random access storage device dynamic memories such as (RAM) of storage multidate information, and the mass storage that comprises magnetic or optical record medium and respective drive.In the present embodiment, association message 121 all is stored in the random access storage device 12 as MMS message, GOOSE message, SMV message and IEEE1588 message, and sampled data and relevant information 122 also are stored in the random access storage device 12.Certainly, in other embodiments, above-mentioned message, sampled data and relevant information also can be stored in the memory of the satisfied read-write speed of other form and storage capacity requirement.
As shown in Figure 1, in the present embodiment, industry measurement and control system also comprises two main equipments 21,22, and certainly in other embodiments, the quantity of main equipment can be one, also can be a plurality of.Main equipment can be the multiple equipment controlling, protect, measure of being used to realize.For example, in transformer substation system, for procedure division, main equipment can be process side device, intelligent metering instrument, converter of interval controller, protection relay, remote control unit etc.; For the man-machine interaction part, main equipment can be PC, operator workstation, gateway or the intelligent electronic device that has man-machine interface; For distant place communications portion, main equipment can be gateway, communication converter, remote control unit etc.In execution mode, main equipment is preferably process side device, the intelligent metering instrument of interval controller, protection relay, remote control unit.Wherein interval controller is used to control the data communication between the different interval; Protection relay is used to finish various relaying protections, as distance protection, bus differential protecting etc.; The process side device of remote control unit is as controlling reclosing etc.; The intelligent metering instrument is used for showing corresponding measurement data statistics result by the sampled data statistics.Can the high-speed serial communication (serial port can be RS-422, RS485, USB etc.) of " point-to-point " between main equipment and the core devices, as main equipment 22; Also can realize communication, as main equipment 21 by local area network (LAN) 40.In the present embodiment, this local area network (LAN) is an Ethernet, comprises Ethernet switch, transmission cable (as optical cable, coaxial cable, twisted-pair feeder) and connection device etc.With regard to data traffic, can be standard ethernet, Fast Ethernet, gigabit Ethernet or even ten thousand mbit ethernets; With regard to topological structure, can be bus-type, also can be star-like.
Each main equipment 21,22 includes master clock 211,221 separately, master clock 211,221 can by GPS carry out to the time, yet when GPS is unavailable, master clock can be synchronized in the core devices 10 of each slave unit by the IEEE1588 agreement.As shown in Figure 1, in the present embodiment, core devices 10 also comprises distant place clock 151 and local clock 152.Wherein distant place clock 151 can be realized the backed up in synchronization 1511,1512 of each master clock by the IEEE1588 agreement, and local clock 152 is independent operating then, and is uncorrelated mutually with main equipment or other core devices.
Below in conjunction with workflow diagram shown in Figure 4, core devices 10 is received and store the data that come from data acquisition unit 31,32 be elaborated.Core devices 10 receives sampled data message (step 611) by sampled data port one 3, and writes down the time T i(step 612 that the sampled data messages enter sampled data port one 3 by local clock 152).Controller 11 parses sampled data and corresponding sampling channel information (step 613) from the sampled data message.Next, controller 11 also can judge whether and will carry out interpolation operation to sampled data, is about to the data based requirement of low-density and is interpolated to high density data (step 614).In the present embodiment, whether to carry out sampling interval, main equipment that interpolation operation depends on respective channel to from the sampling interval of these channel sample data or the requirement of sampling precision to data.For example, the sample frequency of the sampling channel A of data acquisition unit 31 correspondences is 1MHz, sampling interval to be 1 μ s; The sample frequency of the sampling channel B of data acquisition unit 32 correspondences is 0.5MHz, sampling interval to be 2 μ s.If main equipment 21 requires to obtain simultaneously with the sampling interval of 1 μ s the sampled data of sampling channel A and B, the data that obvious sampling channel A obtains satisfy the main equipment requirement fully, and sampling channel B does not satisfy, so will carry out interpolation operation, to reach the sampled data precision (step 615) that satisfies the main equipment requirement to the sampled data that sampling channel B obtains.If another main equipment 22 requires to obtain simultaneously with the sampling interval of 2 μ s the sampled data of sampling channel A and B, obviously passage A and B have satisfied sampling request, so needn't do interpolation operation.For the sampled data of periodically obtaining, owing to may need to offer main equipment with different sampling required precisions, so when judging whether to do interpolation operation, choose all and connect the sampling interval requires the highest being the benchmark sampling interval whether to need each sampling channel is done corresponding interpolation operation thereby differentiate in the main equipment.If the sampling interval of the corresponding sampling channel of sampled data that promptly obtains does not reach this benchmark sampling interval, then controller is carried out interpolation operation to reach the requirement of benchmark sampling interval to the data that are derived from this sampling channel.
Next, controller 11 can sampled data, corresponding sampling channel information and the current sampling time stab information in mark sampling time after interpolation is judged deposit in the data RAM 122 in the lump, subscribes to for main equipment.Need to prove, the current sampling time stab information mark here be sampled data message and local clock data in synchronization sampling time T1.Because the time delay (△ t1) of sampled data from data acquisition unit to the sampled data port fixed, and can record in advance, so controller 11 just can calculate and local clock data in synchronization sampling time T1 according to the time T i that this fixed delay (△ t1) and sampled data enter sampled data port one 3.Cooperate with reference to the storage mode of data in data RAM 122 shown in Figure 7.Data RAM 122 most important two interfaces are address signal and data-signal.When write operation, deposit data designated the address of appointment in, make things convenient for the user to read; During read operation, the user obtains corresponding data information according to different address informations, so the reasonable mapping of address and data is keys of the correct read-write of data RAM.In the present embodiment, store into respectively in the data RAM of respective channel from the sampled data of different passages, as address information, corresponding sampled data then deposits in the corresponding field with time stab information.Still based on above-mentioned example, each passage can store the information of 20000 sampled points, i.e. the sample information of a cycle; After the sample information of next cycle arrives, will cover the information of previous cycle, promptly the information of previous cycle will not exist.Shown in Figure 8 is the another kind of storage modes of data in data RAM 122, in the present embodiment, simultaneously with time stab information and channel information as address information, corresponding sampled data then deposits in the corresponding field.Compare execution mode shown in Figure 7, storage mode shown in Figure 8 can carry out read-write operation to the multi-channel sampling data simultaneously, thereby has improved the processing speed of sampled data.
Below in conjunction with Fig. 6 core devices extracted and sent corresponding data according to the main equipment data command workflow is elaborated.Core devices 10 receives the sampled data instruction message (step 641) that comes from main equipment 21 by ethernet port 14; Controller 11 is resolved the message of being received (step 642), and judges whether the message that receives is sampled data instruction message (step 643).Because core devices 10 also can receive the message that other supports type by ethernet port 14, as come from the sampled data message (hereinafter will do detailed description) of other core devices, then controller can continue to judge whether to be the type of message (step 645) of other support.If not the type of supporting, then controller 11 sends corresponding error interruption (step 646), and sends the control corresponding main equipment instruction errors of message notifying (step 647); If the type of supporting, then resolution data instruction message (step 648), and the information after will resolving deposits memory 12 in, waits for controller 11 processing (step 649).
Turn back to step 643 again, when judgement is a sampled data instruction message (being the GOOSE message), controller 11 resolution datas instruction message (step 650).Usually, main equipment can be divided into two kinds to the mode that core devices obtains the sampled data message: real-time period obtains and the selectivity that happens suddenly is obtained.Real-time period obtains and is meant that main equipment obtains the GOOSE message of control information by having sampled data, core devices is disposed corresponding sampled data acquisition strategy, for example obtain the information of one or more sampling channel with the sampling interval of 1 μ s, as long as this strategy is not changed, core devices will be according to corresponding rule, to the transmission sampled data message of specifying this tactful main equipment real-time period.The burst selectivity is obtained and is meant that main equipment obtains the GOOSE message of control information by having the particular sample data, obtain corresponding sampled data, each GOOSE message only one or one group of correspondence obtains operation, and the GOOSE message is as triggering prerequisite.What receive when core devices is that real-time period is when obtaining the GOOSE message of sampled data, controller 11 parses target sampling channel information from message, and extracts the data (step 651) of appointed interval from the data RAM 122 of respective channel according to this command information.(situation) in this case, the direct execution in step 653 of controller 11 meetings promptly judges whether to do data combination.What receive when core devices is burst selectivity when obtaining the GOOSE message of sampled data, and controller 11 parses target sampling channel information and target sampling time information from message.In addition, controller 11 can also obtain corresponding master clock backup according to the source address of the main equipment that parses, and time clock correction (△ t2) reckoning between the local clock of the master clock by this main equipment and core devices obtains the corresponding and synchronous sampling time T1 of local clock of target sampling time T2.Subsequently, controller is with sampling time T1 index (storage mode shown in Figure 7) in the address information of corresponding sampling channel, or with sampling time T1 and target sampling channel information index (storage mode shown in Figure 8) in address information, thereby from data RAM 122, extract corresponding sampled data.(situation) in this case may can't find corresponding data owing to reason such as overtime, thereby causes extracting failure (step 652).If extract failure, then enter step 646; If extract successfully, then enter step 653.
No matter be that real-time period obtains and the selectivity that happens suddenly is obtained, wanting the data of the sampling type obtained or sample frequency when main equipment has when a plurality of, be that the target sampling channel is when having two at least, controller 11 will make up the sampled data (step 654) that is extracted, subsequently, controller 11 obtains the synchronous target sampling time stamp (step 655) of the master clock with the target main equipment of sampled data.Obtain for the burst selectivity, owing to itself had the target sampled data time stamp synchronous that main equipment requires in the GOOSE message of target main equipment with its master clock, so only need continue to use this time stamp; And obtain for real-time period, controller 11 needs to calculate acquisition.Because controller 11 can obtain the backup of corresponding master clock according to the source address of the main equipment that parses, thereby time clock correction (△ t2) reckoning between the local clock of the master clock by this main equipment and core devices obtains sampling time the T1 corresponding and master clock synchronous sampling time T2 synchronous with local clock.Next, controller 11 is formed sampled data message (step 656) with sampled data with the synchronous target of target master clock sampling time stamp according to corresponding frame format, and sends to target main equipment (step 657).
Main equipment can be implemented the operation of control corresponding, protection or metering according to the sampled data that parses after receiving the sampling data needed message.For example; equipment has relaying protection function-bus differential protecting; main equipment is by monitoring bus circuit instantaneous flow balance whether; perhaps whether phase place is consistent, differentiates busbar fault, as finding fault; start the protection action element; as circuit breaker, all circuit breakers of tripping bus play the bus protection effect.Have the intelligent metering instrument function as main equipment, main equipment can be according to the sampled data that receives, with current/voltage instantaneous flow be presented on the corresponding instrument, and do the power consumption ASSOCIATE STATISTICS.
Core devices only need be according to local clock mark time stamp and the storage of self for the sampled data that enters, thereby when different main equipments need read this sampled data, core devices can be at the corresponding adjustment of different main equipments and its master clock data in synchronization sampling time stamp, thereby satisfies the high real-time requirement of system; In addition, in this way, the sampled data of passing through once to gather of core devices can be shared to different main equipments, has reduced the consumption of core devices, and has simplified the annexation of each equipment room of system, and then reduced the cost of system constructing and maintenance.
With reference to second execution mode of industry measurement and control system among the present invention shown in Fig. 2, be with the main distinction of first execution mode shown in Figure 1, also comprise another core devices in the present embodiment.For ease of distinguishing, in the present embodiment core devices in first execution mode 10 is called first core devices, and newly-increased core devices 19 is called second core devices (or being called slave).First core devices 10, main equipment 21,22(or be called target device), be referred to as first data acquisition unit in data acquisition unit 31, the 32(present embodiment), network 40 all identical with described in first execution mode is so the applicant is no longer given unnecessary details at this.In the present embodiment, the main distinction of second core devices 19 and first core devices 10 is that second distant place clock 161 of second core devices 19 is realized the backup of first local clock 152 of first core devices 10 according to the IEEE1588 agreement.Realize communication by Ethernet between second core devices 19 and first core devices 10.
In the present embodiment, first core devices 10 can also receive the second sampled data message that comes from second core devices 19 by ethernet port except receiving the first sampled data message that comes from first data acquisition unit 31,32 by the sampled data port.Wherein, second sampled data that comprises in first sampled data that comprises in the first sampled data message and the second sampled data message has different sampling types and/or different sample frequencys.Second core devices 19 is gathered second sampled data by second data acquisition unit 33.Be similar to first core devices, 10, the second core devices 19 enter its sampled data port by its second local clock, 162 records, second sampled data message time T i; And according to the precognition the fixed delay △ t1 of second sampled data from second data acquisition unit 33 to its sampled data port extrapolate and second local clock, 162 data in synchronization sampling time T1.When second core devices 19 will be when first core devices 10 sends sampled data, it can will be adjusted to and first local clock, 162 data in synchronization sampling time T2 with second local clock, 162 data in synchronization sampling time T1 according to the time clock correction △ t2 of first local clock and second local clock, then this time stab information and second sampled data be sent after according to corresponding frame format composition sampled data message.
Cooperate to receive and come from the second core devices 19(slave with reference to first core devices 10 shown in Figure 5) the concrete workflow of sampled data message, first core devices 10 receives the sampled data message (step 621) that comes from second core devices by its ethernet port; Controller 11 is resolved the message of being received (step 623), and judges whether the message that receives is sampled data message (step 624).Because core devices 10 also can receive the message that other supports type by ethernet port 14, as come from the GOOSE message (preceding address) of main equipment, then controller can continue to judge whether to be the type of message (step 627) of other support.If not the type of supporting, then controller 11 sends corresponding error interruption (step 628), writes down and abandon this message (step 629) then; If the type of supporting, then resolution data message (step 630), and the information after will resolving deposits memory 12 in, waits for controller 11 processing (step 631).Get back to step 624, if the sampled data message, then controller 11 is resolved the sampled data messages, obtain sampled data, sampling channel information, and and the synchronous sampling time information (step 625) of first local clock 152; Then these data and information are deposited in the lump in the memory 12 and subscribe to (step 625) for different main equipments.About the process of first core devices to main equipment (target device) transmission target sampled data message, describe in detail in the above-described embodiment, the applicant is no longer given unnecessary details at this.What those skilled in the art can expect easily is that this system can also comprise one the 3rd core devices.The 3rd core devices can be communicated by letter with second core devices and be submitted sampled data to, so the slave of second core devices is the 3rd core devices at this moment, and its target device is first core devices.
Shown in Figure 3 is the 3rd execution mode of industry measurement and control system among the present invention, is that with the main distinction of first execution mode main equipment and core devices pass through group-net communication.Wherein, main equipment 21 is by first Ethernet switch 41 and second Ethernet switch 42 and core devices 10 cascades; Main equipment 22 is connected with core devices 10 by second Ethernet switch 42.By group-net communication, can help syndeton clear, be easy to safeguard.For example, distribute switch with the unit of being spaced apart, no matter how much are the intelligent electronic device that is comprised in interval, protection observing and controlling element, core devices number, all will distribute a complete switch for them, not shared switch between the different intervals; Perhaps will need the hanging equipments such as intelligent electronic device, protection observing and controlling element, core devices of more information interaction to receive on the switch each other, connect again between the different switches.
The 4th execution mode of industry measurement and control system among the present invention as shown in Figure 9, similar with second execution mode shown in Figure 2, this system comprises first core devices 10 and second core devices 19, identical in the realization of the hardware and software of two core devices and second execution mode is so the applicant is no longer given unnecessary details at this.The data that data acquisition unit 31,32 is gathered transform through mould/number and send second core devices 19 to after device (ADC) transforms, and are stored in second core devices 10 with its current sampling time information.This current sampling time and second local clock 162 are synchronous.The current sampling time obtain with aforementioned embodiments in identical, the applicant is no longer given unnecessary details at this.Second core devices 19 sends to main equipment 23 by serial port 17 after the data that collect and target sampling time information can being formed the sampled data message by corresponding frame format, also can send to the main equipment 21 and first core devices 10 by the Ethernet of supporting the IEEE1588 agreement by ethernet port 14.Wherein the target sampling time of the sampled data that collects of second core devices 19 respectively according to first local clock backup of the master clock backup of the main equipment in second distant place clock 161 21,23 and first core devices 10 realizes with main equipment 21, main equipment 23, to reach first core devices 10 clock 211,231,152 separately synchronous.Second distant place clock 161 is realized main equipment 21, main equipment 23, and the backup of first core devices, 10 each self-clock according to the IEEE1588 agreement, and according to the time clock correction of 162 of each clock and second local clocks current sampling time is adjusted into the corresponding target sampling time.
First core devices 10 receives the sampled data message by ethernet port 14, and after its controller (not shown) resolve to obtain sampled data and with the synchronous current sampling time of first local clock, and can be packaged into the sampled data message with sampled data and with the synchronous target sampling time information of its master clock 221 according to the instruction of main equipment 22, then send to the main equipment 22 that straight line connects by serial port 17, certainly, also can send to other main equipment or core devices by ethernet port 14, only the target sampling time need with other main equipment or core devices clock synchronization separately.Wherein, the controller of first core devices 10 obtains the time clock correction of 152 of master clock 221 and first local clocks according to the backup of the master clock 221 in first distant place clock 151, and clock correction will be adjusted to the target sampling time synchronous with master clock 221 with synchronous current sampling time of first local clock 151 during according to this.First distant place clock 151 is realized the backup of the master clock 221 of main equipment 22 according to the IEEE1588 agreement.
As can be seen, serial port 17 or ethernet port 14 have constituted virtual analog-to-digital conversion port one 8, main equipment can obtain the sampled data synchronous with its master clock by this port, just directly obtains sampled data as the sata hard wiring by " point-to-point " from the analog-to-digital conversion device of reality.Though sampled data has been passed through multilevel device in transmission course, but because each equipment is realized interconnected by the Ethernet of supporting the IEEE1588 agreement, solved the problem of time synchronized, thereby the straight line that exchanges for synchronously on the hardware by the time connects, and greatly reduces the cost that Remote Industrial Control System makes up.
Be to be understood that, though this specification is described according to execution mode, but be not that each execution mode only comprises an independently technical scheme, this narrating mode of specification only is for clarity sake, those skilled in the art should make specification as a whole, technical scheme among each embodiment also can form other execution modes that it will be appreciated by those skilled in the art that through appropriate combination.
Above listed a series of detailed description only is specifying at feasibility execution mode of the present invention; they are not in order to restriction protection scope of the present invention, allly do not break away from equivalent execution mode or the change that skill spirit of the present invention done and all should be included within protection scope of the present invention.
Claims (7)
1. a virtual analog-to-digital conversion core devices is used for image data, and offers and be used to the main equipment controlling or protect; It is characterized in that, this core devices comprises virtual analog-to-digital conversion port, core devices sends the target sampled data message comprise with the synchronous sampled data of the master clock of main equipment by this virtual analog-to-digital conversion port to main equipment, and described virtual analog-to-digital conversion port comprises serial port.
2. virtual analog-to-digital conversion core devices according to claim 1 is characterized in that, described virtual analog-to-digital conversion port also comprises ethernet port.
3. virtual analog-to-digital conversion core devices according to claim 2 is characterized in that, described ethernet port also is used for obtaining the sampled data message by the Ethernet of supporting the IEEE1588 agreement.
4. virtual analog-to-digital conversion core devices according to claim 3, it is characterized in that, this core devices also comprises controller, and described controller is used to resolve described sampled data message to obtain sampled data, and and the synchronous current sampling time information of local clock of core devices.
5. virtual analog-to-digital conversion core devices according to claim 4 is characterized in that this core devices also comprises distant place clock, and described distant place clock is realized the master clock backup of main equipment according to the IEEE1588 agreement.
6. virtual analog-to-digital conversion core devices according to claim 5 is characterized in that, described controller also is used for the described current sampling time is adjusted to the target sampling time synchronous with the master clock of main equipment.
7. virtual analog-to-digital conversion core devices according to claim 6, it is characterized in that, the operation that described controller is adjusted into the target sampling time with the current sampling time comprises: backup obtains the time clock correction (△ t2) of master clock and local clock according to described master clock, and clock correction will be adjusted to the target sampling time (T2) synchronous with the master clock of main equipment with synchronous current sampling time (T1) of local clock when described.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101063470A CN102215100A (en) | 2011-04-27 | 2011-04-27 | Virtual analog-to-digital conversion core device based on IEEE (Institute of Electrical and Electronic Engineers) 1588 Ethernet |
| US13/280,319 US20120278421A1 (en) | 2011-04-27 | 2011-10-24 | Providing a data sample in a measurement and control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101063470A CN102215100A (en) | 2011-04-27 | 2011-04-27 | Virtual analog-to-digital conversion core device based on IEEE (Institute of Electrical and Electronic Engineers) 1588 Ethernet |
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| CN102215100A true CN102215100A (en) | 2011-10-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103516454A (en) * | 2012-06-20 | 2014-01-15 | 中兴通讯股份有限公司 | Clock synchronization method, device and communication apparatus |
| WO2014101275A1 (en) * | 2012-12-28 | 2014-07-03 | 辽宁省电力有限公司 | Electronic transformer overall detection and evaluation system |
| US12003087B2 (en) | 2020-01-31 | 2024-06-04 | Hitachi Energy Ltd | Time synchronization between IEDs of different substations |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103516454A (en) * | 2012-06-20 | 2014-01-15 | 中兴通讯股份有限公司 | Clock synchronization method, device and communication apparatus |
| CN103516454B (en) * | 2012-06-20 | 2017-11-03 | 中兴通讯股份有限公司 | Clock synchronizing method, device and communication equipment |
| WO2014101275A1 (en) * | 2012-12-28 | 2014-07-03 | 辽宁省电力有限公司 | Electronic transformer overall detection and evaluation system |
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Application publication date: 20111012 |