CN105203986A - Digital power source tracing method and system - Google Patents
Digital power source tracing method and system Download PDFInfo
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Abstract
The invention discloses a digital power source tracing method and system. The method includes the steps that a digital quantity analog waveform fitting device performs analog conversion on digital signals sent by a digital power source so that a current analog signal and a voltage analog signal can be generated; the digital quantity analog waveform fitting device sends the current analog signal and the voltage analog signal to a standard electric energy meter; the stand electric energy meter detects electric energy of the current analog signal and the voltage analog signal, and a tracing result is generated. The method and system solve the technical problem that the tracing precision of a digital power source in the prior art is low.
Description
Technical field
The present invention relates to power domain, in particular to the method and system that a kind of digital power source is traced to the source.
Background technology
In recent years, along with intelligent substation widelys popularize construction, transforming plant primary and secondary device and framework all achieve very large breakthrough and development, and the especially application of electronic mutual inductor, merge cells and digital electric energy meter, brings deep change to transformer station's metering system.Transformer station's metering system is towards digitizing, intelligent direction development, and the digitized measurement device is constantly popularized, and final replacement conventional metered dose device is intelligent substation metering system inevitable development direction from now on.The accuracy of digitalized electric energy metering is to ensureing that power grid security and effective overall accuracy improving measurement loop have major and immediate significance.
It should be noted that, digital quantity power source can be calibrated current most digitalized electric energy measuring apparatus, and due to the domestic digitalized electric energy metering traceability system of value and the standard of working up that there is no at present, the digitalized electric energy metering magnitude tracing of digital quantity power source is still a great problem existed at present.In addition, the work of tracing to the source abroad for digitalized electric energy metering value is also ground zero, and the mode of tracing to the source at present is few, and process lacks authority, and preciseness also needs to be tested, lower to the precision of tracing to the source of digital power source.
For the problem that prior art is lower to the precision of tracing to the source of digital power source, at present effective solution is not yet proposed.
Summary of the invention
Embodiments provide the method and system that a kind of digital power source is traced to the source, at least to solve the prior art technical matters lower to the precision of tracing to the source of digital power source.
According to an aspect of the embodiment of the present invention, provide a kind of method that digital power source is traced to the source, the method comprises: the digital signal that digital power source sends by digital quantity analog waveform matching device carries out analog-converted, generates current analog signal and voltage analog signal; Current analog signal and voltage analog signal are sent to standard electric energy meter by digital quantity analog waveform matching device; Standard electric energy meter carries out electric energy calibrating to current analog signal and voltage analog signal, generates result of tracing to the source.
According to the another aspect of the embodiment of the present invention, additionally provide the system that a kind of digital power source is traced to the source, this system comprises: digital power source, for sending digital signal; Digital quantity analog waveform matching device, for digital signal is carried out analog-converted, generates current analog signal and voltage analog signal; Standard electric energy meter, for carrying out electric energy calibrating to current analog signal and voltage analog signal, generates result of tracing to the source.
In embodiments of the present invention, the digital signal adopting digital quantity analog waveform matching device to be sent by digital power source carries out analog-converted, generates current analog signal and voltage analog signal; Current analog signal and voltage analog signal are sent to standard electric energy meter by digital quantity analog waveform matching device; Standard electric energy meter carries out electric energy calibrating to current analog signal and voltage analog signal, generates result of tracing to the source, solves the technical matters that prior art is lower to the precision of tracing to the source of digital power source.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the process flow diagram of the method for tracing to the source according to a kind of digital power source of the embodiment of the present invention;
Fig. 2 is the schematic diagram of the method for tracing to the source according to a kind of digital power source of the embodiment of the present invention;
Fig. 3 is the schematic diagram of the analog waveform matching device of digital quantity according to inventive embodiments;
Fig. 4 is the schematic diagram of the D/A conversion module according to the embodiment of the present invention;
Fig. 5 is the schematic diagram of the electric current front end power amplifier module according to the embodiment of the present invention;
Fig. 6 is the schematic diagram of the voltage front end power amplifier module according to the embodiment of the present invention; And
Fig. 7 is the schematic diagram of the system of tracing to the source according to the digital power source of the embodiment of the present invention.
Embodiment
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Embodiment one
According to the embodiment of the present invention, provide the embodiment of a kind of method that digital power source is traced to the source, it should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the process flow diagram of accompanying drawing, and, although show logical order in flow charts, in some cases, can be different from the step shown or described by order execution herein.
Fig. 1 is the process flow diagram of the method for tracing to the source according to the digital power source of the embodiment of the present invention, and as shown in Figure 1, the method comprises the steps:
Step S12, the digital signal that digital power source sends by digital quantity analog waveform matching device carries out analog-converted, generates current analog signal and voltage analog signal.
Particularly, composition graphs 2, this programme can adopt digital quantity analog waveform matching device to change the digital signal that digital power source sends, alternatively, above-mentioned digital signal can for meeting the SV message of IEC61850 agreement, and above-mentioned SV message can comprise the information such as voltage, electric current, markers.Digital quantity analog waveform matching device is translated into corresponding current/voltage simulating signal after receiving SV message.
Step S14, current analog signal and voltage analog signal are sent to standard electric energy meter by digital quantity analog waveform matching device.
Particularly, composition graphs 2, in this programme, above-mentioned standard electric energy meter can be standard electric energy meter COM3000.
Step S16, standard electric energy meter carries out electric energy calibrating to current analog signal and voltage analog signal, generates result of tracing to the source.
Particularly, composition graphs 2, above-mentioned standard electric energy meter COM3000, after receiving current analog signal and voltage analog signal, can carry out virtual load calibrating and error analysis to current analog signal and voltage analog signal, to realize the process of tracing to the source of digital quantity standard source.
The digital signal of digital power source is converted to corresponding current analog signal and voltage analog signal by adopting digital quantity analog waveform matching device by the present embodiment respectively, afterwards the standard electric energy meter that current and voltage signals receives simulation by the method that virtual load is examined and determine is examined and determine, realize tracing to the source of digitalized electric energy metering value.Solve the problem that prior art is lower to the precision of tracing to the source of digital power source.The present embodiment utilizes based on perfect analog quantity traceability system, the digital signal that digital power source exports is converted into synchronous simulating signal, carries out analog source tracing afterwards.This way can make the transmission of digitalized electric energy metering value more rigorous.
Alternatively, step S16, standard electric energy meter carries out electric energy calibrating to current analog signal and voltage analog signal, and the step generating result of tracing to the source can comprise:
Step S162, standard electric energy meter generates the performance number of standard electric energy meter according to current analog signal and voltage analog signal.
Step S164, standard electric energy meter receives the performance number of the digital power source that digital power source sends.
Step S166, the performance number of the performance number of standard electric energy meter and digital power source is carried out error analysis by standard electric energy meter, generates result of tracing to the source.
Particularly, in this programme, composition graphs 2, the standard electric energy meter COM3000 of simulation is after receiving current and voltage signals, virtual load calibrating can be carried out to current and voltage signals, finally the standard electric energy meter performance number of simulation and the performance number of digital power source are carried out error analysis, realize process of tracing to the source.
Alternatively, above-mentioned digital quantity analog waveform matching device at least comprises: network communication module, protocol resolution module, processing module, D/A conversion module, voltage front end power amplifier module and electric current front end power amplifier module, wherein, step S12, the digital signal that digital power source sends by digital quantity analog waveform matching device carries out analog-converted, and the step generating current analog signal and voltage analog signal can comprise:
Step S121, network communication module receives digital signal.
Particularly, above-mentioned network communication module can adopt ethernet physical layer chip RTL8201, adopt photoelectric conversion module AFBR5803 to complete the physical connection of the Ethernet of light, the interface of network communication module can provide physical communication link for the digital communication of IEC61850 agreement simultaneously.
Step S122, digital signal is sent to protocol resolution module by network communication module.
Particularly, in this programme, above-mentioned protocol resolution module can be IEC61850 protocol resolution module.
Step S123, the digital signal after resolving also is sent to processing module by protocol resolution module resolution digital signal.
Particularly, in this programme, above-mentioned processing module can be core control treatment module.
Step S124, the digital signal after parsing processes by processing module, generates Wave data.
Step S125, Wave data is sent to D/A conversion module and carries out digital-to-analog conversion by processing module.
Step S126, Wave data after conversion is sent to voltage front end power amplifier module and electric current front end power amplifier module by D/A conversion module, wherein, voltage front end power amplifier module is used for the Wave data formation voltage simulating signal after according to conversion, and electric current front end power amplifier module is used for the Wave data after according to conversion and generates current analog signal.
Particularly, in this programme, the digital quantity that digital quantity standard source produces can be converted to analog quantity by digital quantity analog waveform matching device, utilizes standard electric energy meter to carry out electric energy calibrating afterwards, thus realizes the process of tracing to the source of digital quantity standard source.Wherein, composition graphs 3, digital quantity analog waveform matching device can comprise: the large module of IEC61850 protocol resolution module, network communication module, high precision D/A conversion module, high-precision current front end power amplifier module, high-accuracy voltage front end power amplifier module, core control treatment module and industrial computer seven in real time.Network communication module is delivered to real-time IEC61850 protocol resolution module after receiving outside IEC61850 message and is resolved, the data of having resolved are delivered to core control treatment module by real-time IEC61850 protocol resolution module, the data processed are delivered to high precision D/A conversion module and are carried out DA conversion by core control processor module, there is provided synchronizing signal simultaneously, core control processor module is connected with industrial computer on the other hand, provides human-computer interaction function by industrial computer.The data received coordinate synchronizing signal to be converted to multichannel analog signals and to deliver to high-precision current front end power amplifier module and high-accuracy voltage front end power amplifier module respectively by high precision D/A conversion module, export three-phase current voltage signal after conversion and above-mentioned voltage analog signal and current analog signal by high-precision current front end power amplifier module and high-accuracy voltage front end power amplifier module.
Alternatively, above-mentioned industrial computer can adopt the LX-801A industrial computer of Seatech, uses the electric resistance touch screen of 800*600, is responsible for the man-machine interaction part in the course of work, and it can the information such as display working condition, frame losing situation, signal data and waveform in real time.
Alternatively, above-mentioned D/A conversion module can be the synchronous D/A converter compositions in 6 tunnels, and D/A converter adopts the 16bit high precision digital-to-analog converter of AD5545 of ADI company.Simultaneously in order to improve circuit precision further, D/A converter adopts the mode of " two DA " to design.As shown in Figure 4, in figure, REF provides the reference voltage of high stability for DA1 to the design frame chart of " two DA ", the output of DA1 afterwards by follow circuit for DA2 provides reference voltage.This way can make the equivalency transform precision of the D/A converter of this module reach 32, and meanwhile, this module can reach very high precision by calibration, can carry out control calibration during calibration by control DA1 to the reference voltage of DA2.
Alternatively, above-mentioned electric current front end power amplifier module can be high-precision electric current front end power amplifier module, the schematic diagram of electric current front end power amplifier module as shown in Figure 5, first D/A converter is D/A converter module, first metal-oxide-semiconductor is typical push-pull configuration to pipe, the positive output end of the first D/A converter is connected with R1, the negative output terminal of the first D/A converter is connected with R3, positive input terminal and the R2 of R1 and amplifier are connected, the negative input end of R3 and R4, C1 and amplifier is connected, one MOS is connected with the output of amplifier to pipe one end, and one end is connected with R2 and R5, and R5 and R4 and C1 is connected.What wherein V/I circuit adopted is difference channel, and when R1, R2, R3, R4 are completely equal, the ohmically voltage of R5 is input voltage size, and voltage obtains electric current divided by resistance, completes V/I conversion.From circuit structure, the principal element affecting electric current output accuracy has: the performance of power amplifier, the matching degree of R1, R2, R3, R4 tetra-arm resistances, the precision of resistance R5 and degree of stability.Choose the power amplification driving chip LME49830 that U.S. National Semiconductor is released, it is roomy that LME49830 has low noise, high Power Supply Rejection Ratio, extremely low degree of distortion and power band, there is the drive current of 56MA, the driving voltage of maximum 16V, almost can drive all MOS.LME49830 integrated circuit can support the output power of 1KW, 1kHz frequency typical case's total harmonic distortion plus noise only 7ppm.R1, R2, R3, R4 for all adopting precision to be ten thousand/ precision resistance, reduce arm resistance and do not mate the impact brought.R5 adopts the accurate platinum resistance of import vishay, and the drift of typical case's temperature is 10PPM.In addition, carry out high current by parallel multiplex herein to export.
Alternatively, above-mentioned voltage front end power amplifier module can be high-precision voltage front end power amplifier module, the schematic diagram of voltage front end power amplifier module as shown in Figure 6, second D/A converter is D/A converter module, second metal-oxide-semiconductor is typical metal-oxide-semiconductor push-pull configuration to pipe, the positive output end of the second D/A converter is connected with R6, the other end of R6 is connected with the positive input terminal of amplifier, the negative output terminal of the second D/A converter is connected with R7, the negative input end of R7 and R8, C2 and amplifier is connected, 2nd MOS is connected with the output of amplifier to pipe one end, and the other end is connected with R8, C2.This circuit is typical positive amplifying circuit, and rear end metal-oxide-semiconductor is used for power amplification to pipe.Wherein R6 and R8 is equal, and the resistance of R8 is the resistance of 5 times of R7.This circuit voltage can reach 50V, herein by isolated from power technology, is superposed by the voltage of this module of polylith, obtains higher voltage.
Alternatively, above-mentioned digital signal can for meeting the message of the first electric power data communication protocol, wherein, step S123, the step of protocol resolution module resolution digital signal can comprise:
Step S1231, protocol resolution module is resolved the message meeting the first electric power data communication protocol by fpga chip.
Particularly, in this programme, the above-mentioned message meeting the first electric power data communication protocol can be IEC61850 message.Above-mentioned IEC61850 protocol resolution module can adopt the process core of fpga chip A3P250 as protocol analysis of ACTEL company, the pulse per second (PPS) that FPGA sends according to DSP, complete the calibration of base during FPGA itself, receive the IEC61850 message from network communication module.The message received is resolved by IEC61850 protocol module, extracts the signal such as markers, voltage sample value, current sampling data in message, afterwards these values is delivered to core control treatment module and process.
Alternatively, the digital signal after above-mentioned parsing at least comprises: voltage sample value, current sampling data, wherein, step S124, the digital signal after parsing processes by processing module, and the step generating Wave data can comprise:
Step S1241, processing module carries out interpolation processing to voltage sample value and current sampling data respectively, generates Wave data.
Particularly, core control treatment module and above-mentioned processing module can adopt the double-nuclear DSP processor of ADI company, and expand the DDR2 isochronous memory of 128MB and the asynchronous access Flash of 32M, its highest frequency can reach 500MHz, for device provides powerful signal handling capacity.Wherein, this core control treatment module will process the information such as markers, voltage sample value, current sampling data sent here by real-time IEC61850 protocol resolution module, wherein, the process that core processing module carries out processing comprises the matching of synchronous, the voltage current waveform of electric current and voltage and carries out interpolation processing to sampled value, reduces the Wave data that its digital power source produces.Afterwards the Wave data processed is delivered to high precision D/A conversion module, and simultaneously tranmitting data register synchronizing signal.
Under a kind of scene of practical application, the present invention is described below:
The object of the invention is to the traceability system developing a kind of digital quantity power source.
Above-mentioned purpose of the present invention can be realized by following technical measures: the traceability system of digital quantity power source utilizes synchronous digital quantity analog waveform matching device that the digital message that digital quantity standard source produces is converted to voltage and current signal, utilize standard electric energy meter to carry out electric energy calibrating afterwards, thus realize the process of tracing to the source of digital quantity standard source.For the development of digital quantity analog converter, it is characterized in that: it comprises the large module of real-time IEC61850 protocol resolution module, network communication module, high precision D/A conversion module, high-precision current front end power amplifier module, high-accuracy voltage front end power amplifier module, core control treatment module and industrial computer seven.Described network communication module is connected with IEC61850 protocol resolution module, and IEC61850 protocol resolution module is connected with core control treatment module; High precision D/A conversion module is connected with core control treatment module; High-precision current front end power amplifier module is connected with high precision D/A conversion module; High-accuracy voltage front end power amplifier module is connected with high precision D/A conversion module; Industrial computer is connected with core control treatment module.
The present invention, as the traceability system of digitizing power source, focuses on the development of synchronous digital quantity analog waveform matching device, and the effect of digital quantity analog waveform matching device is that the electric current and voltage sampled signal in IEC61850 is reduced to analog voltage current signal.
Real-time IEC61850 protocol resolution module of the present invention can be resolved IEC61850 agreement, thus obtains signal data, and wherein this module makes in the mode of protocol library, conveniently expands, upgrades and calls.
Network communication module of the present invention provides the physical communication link of IEC61850 agreement.
The digital signal that core control treatment module exports can be carried out high precision by high precision D/A conversion module of the present invention, the simulating signal of high stability transforms.
The voltage signal that high precision D/A conversion module can transform out by high-precision current front end of the present invention power amplifier module carries out electric current and voltage conversion, and smoothing filtering simultaneously, its electric current conversion accuracy is high, and degree of stability is high.
The voltage signal that high precision D/A conversion module can transform out by high-accuracy voltage front end of the present invention power amplifier module carries out voltage conversion, and smoothing filtering simultaneously, its voltage converting accuracy is high, and degree of stability is high.
The analog sampling signal that IEC61850 protocol resolution module can be brought by core control treatment module of the present invention carries out the analog waveform process of fitting treatment of electric current and voltage, comprising the digital process such as waveform interpolation, current and voltage signals be synchronous.Afterwards the current and voltage signals processed is delivered to D/A module and carry out the conversion of digital signal to simulating signal.
Industrial computer of the present invention is used for the various parameter of opertaing device, can show each parameter of current and voltage signals and waveform in real time simultaneously.
Compared with prior art, the present invention has following significant effect:
The present invention utilizes based on perfect analog quantity traceability system, the digital signal that digital power source exports is converted into synchronous simulating signal, carries out analog source tracing afterwards.It is more rigorous that this way can make digitalized electric energy measure the transmission of value, the magnitude tracing of the digital power source that the present invention sets up, and filled up current digital power source and to have traced to the source the blank of instrument.
Embodiment two
This enforcement additionally provides the system that a kind of digital power source is traced to the source, and as shown in Figure 7, this system can comprise:
Digital power source 72, for sending digital signal.
Digital quantity analog waveform matching device 74, for digital signal is carried out analog-converted, generates current analog signal and voltage analog signal.
Particularly, composition graphs 2, this programme can adopt digital quantity analog waveform matching device to change the digital signal that digital power source sends, alternatively, above-mentioned digital signal can for meeting the SV message of IEC61850 agreement, and above-mentioned SV message can comprise the information such as voltage, electric current, markers.Digital quantity analog waveform matching device is translated into corresponding current/voltage simulating signal after receiving SV message.
Standard electric energy meter 76, for carrying out electric energy calibrating to current analog signal and voltage analog signal, generates result of tracing to the source.
Particularly, composition graphs 2, in this programme, above-mentioned standard electric energy meter can be standard electric energy meter COM3000, above-mentioned standard electric energy meter COM3000 is after receiving current analog signal and voltage analog signal, virtual load calibrating and error analysis can be carried out, to realize the process of tracing to the source of digital quantity standard source to current analog signal and voltage analog signal.
The digital signal of digital power source is converted to corresponding current analog signal and voltage analog signal by adopting digital quantity analog waveform matching device by the present embodiment respectively, afterwards the standard electric energy meter that current and voltage signals receives simulation by the method that virtual load is examined and determine is examined and determine, realize tracing to the source of digitalized electric energy metering value.Solve the problem that prior art is lower to the precision of tracing to the source of digital power source.The present embodiment utilizes based on perfect analog quantity traceability system, the digital signal that digital power source exports is converted into synchronous simulating signal, carries out analog source tracing afterwards.This way can make the transmission of digitalized electric energy metering value more rigorous.
Alternatively, above-mentioned digital quantity analog waveform matching device 74 can comprise:
Network communication module, for receiving digital signal.
Particularly, above-mentioned network communication module can adopt ethernet physical layer chip RTL8201, adopt photoelectric conversion module AFBR5803 to complete the physical connection of the Ethernet of light, the interface of network communication module can provide physical communication link for the digital communication of IEC61850 agreement simultaneously.
Protocol resolution module, for resolution digital signal and by resolve after digital signal send.
Particularly, in this programme, above-mentioned protocol resolution module can be IEC61850 protocol resolution module.
Processing module, for the digital signal after parsing being processed, generates Wave data.
Particularly, in this programme, above-mentioned processing module can be core control treatment module.
D/A conversion module, for converted wave data and by conversion after Wave data be sent to voltage front end power amplifier module and electric current front end power amplifier module.
Voltage front end power amplifier module, for according to conversion after Wave data formation voltage simulating signal.
Electric current front end power amplifier module, for generating current analog signal according to the Wave data after conversion.
Particularly, in this programme, the digital quantity that digital quantity standard source produces can be converted to analog quantity by digital quantity analog waveform matching device, utilizes standard electric energy meter to carry out electric energy calibrating afterwards, thus realizes the process of tracing to the source of digital quantity standard source.Wherein, composition graphs 3, digital quantity analog waveform matching device can comprise: the large module of IEC61850 protocol resolution module, network communication module, high precision D/A conversion module, high-precision current front end power amplifier module, high-accuracy voltage front end power amplifier module, core control treatment module and industrial computer seven in real time.Network communication module is delivered to real-time IEC61850 protocol resolution module after receiving outside IEC61850 message and is resolved, the data of having resolved are delivered to core control treatment module by real-time IEC61850 protocol resolution module, the data processed are delivered to high precision D/A conversion module and are carried out DA conversion by core control processor module, there is provided synchronizing signal simultaneously, core control processor module is connected with industrial computer on the other hand, provides human-computer interaction function by industrial computer.The data received coordinate synchronizing signal to be converted to multichannel analog signals and to deliver to high-precision current front end power amplifier module and high-accuracy voltage front end power amplifier module respectively by high precision D/A conversion module, export three-phase current voltage signal after conversion and above-mentioned voltage analog signal and current analog signal by high-precision current front end power amplifier module and high-accuracy voltage front end power amplifier module.
Alternatively, above-mentioned industrial computer can adopt the LX-801A industrial computer of Seatech, uses the electric resistance touch screen of 800*600, is responsible for the man-machine interaction part in the course of work, and it can the information such as display working condition, frame losing situation, signal data and waveform in real time.
Alternatively, above-mentioned D/A conversion module can be the synchronous D/A converter compositions in 6 tunnels, and D/A converter adopts the 16bit high precision digital-to-analog converter of AD5545 of ADI company.Simultaneously in order to improve circuit precision further, this D/A conversion module adopts the mode of " two DA " to design.As shown in Figure 4, in figure, ref provides the reference voltage of high stability for DA1 to the design frame chart of " two DA ", the output of DA1 afterwards by follow circuit for DA2 provides reference voltage.This way can make the equivalency transform precision of the D/A converter of this module reach 32, and meanwhile, this module can reach very high precision by calibration, can carry out control calibration during calibration by control DA1 to the reference voltage of DA2.
Alternatively, above-mentioned electric current front end power amplifier module can be high-precision electric current front end power amplifier module, the schematic diagram of electric current front end power amplifier module as shown in Figure 5, first D/A converter is D/A converter module, first metal-oxide-semiconductor is typical push-pull configuration to pipe, the positive output end of the first D/A converter is connected with R1, the negative output terminal of the first D/A converter is connected with R3, positive input terminal and the R2 of R1 and amplifier are connected, the negative input end of R3 and R4, C1 and amplifier is connected, one MOS is connected with the output of amplifier to pipe one end, and one end is connected with R2 and R5, and R5 and R4 and C1 is connected.What wherein V/I circuit adopted is difference channel, and when R1, R2, R3, R4 are completely equal, the ohmically voltage of R5 is input voltage size, and voltage obtains electric current divided by resistance, completes V/I conversion.From circuit structure, the principal element affecting electric current output accuracy has: the performance of power amplifier, the matching degree of R1, R2, R3, R4 tetra-arm resistances, the precision of resistance R5 and degree of stability.Choose the power amplification driving chip LME49830 that U.S. National Semiconductor is released, it is roomy that LME49830 has low noise, high Power Supply Rejection Ratio, extremely low degree of distortion and power band, there is the drive current of 56MA, the driving voltage of maximum 16V, almost can drive all MOS.LME49830 integrated circuit can support the output power of 1KW, 1kHz frequency typical case's total harmonic distortion plus noise only 7ppm.R1, R2, R3, R4 for all adopting precision to be ten thousand/ precision resistance, reduce arm resistance and do not mate the impact brought.R5 adopts the accurate platinum resistance of import vishay, and the drift of typical case's temperature is 10PPM.In addition, carry out high current by parallel multiplex herein to export.
Alternatively, above-mentioned voltage front end power amplifier module can be high-precision voltage front end power amplifier module, the schematic diagram of voltage front end power amplifier module as shown in Figure 6, second D/A converter is D/A converter module, second metal-oxide-semiconductor is typical metal-oxide-semiconductor push-pull configuration to pipe, the positive output end of the second D/A converter is connected with R6, the other end of R6 is connected with the positive input terminal of amplifier, the negative output terminal of the second D/A converter is connected with R7, the negative input end of R7 and R8, C2 and amplifier is connected, 2nd MOS is connected with the output of amplifier to pipe one end, and the other end is connected with R8, C2.This circuit is typical positive amplifying circuit, and rear end metal-oxide-semiconductor is used for power amplification to pipe.Wherein R6 and R8 is equal, and the resistance of R8 is the resistance of 5 times of R7.This circuit voltage can reach 50V, herein by isolated from power technology, is superposed by the voltage of this module of polylith, obtains higher voltage.
Alternatively, above-mentioned digital signal can for meeting the message of the first electric power data communication protocol, and wherein, above-mentioned protocol resolution module can comprise:
Fpga chip, for resolving the message meeting the first electric power data communication protocol.
Particularly, in this programme, the above-mentioned message meeting the first electric power data communication protocol can be IEC61850 message.Above-mentioned IEC61850 protocol resolution module can adopt the process core of fpga chip A3P250 as protocol analysis of ACTEL company, the pulse per second (PPS) that FPGA sends according to DSP, complete the calibration of base during FPGA itself, receive the IEC61850 message from network communication module.The message received is resolved by IEC61850 protocol module, extracts the signal such as markers, voltage sample value, current sampling data in message, afterwards these values is delivered to core control treatment module and process.
Alternatively, the digital signal after above-mentioned parsing at least comprises: voltage sample value, current sampling data, and wherein, above-mentioned processing module can comprise:
Interpolating module, for carrying out interpolation processing to voltage sample value and current sampling data, generates Wave data.
Particularly, core control treatment module and above-mentioned processing module can adopt the double-nuclear DSP processor of ADI company, and expand the DDR2 isochronous memory of 128MB and the asynchronous access Flash of 32M, its highest frequency can reach 500MHz, for device provides powerful signal handling capacity.Wherein, this core control treatment module will process the information such as markers, voltage sample value, current sampling data sent here by real-time IEC61850 protocol resolution module, wherein, the process that core processing module carries out processing comprises the matching of synchronous, the voltage current waveform of electric current and voltage and carries out interpolation processing to sampled value, reduces the Wave data that its digital power source produces.Afterwards the Wave data processed is delivered to high precision D/A conversion module, and simultaneously tranmitting data register synchronizing signal.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
In several embodiments that the application provides, should be understood that, disclosed technology contents, the mode by other realizes.Wherein, device embodiment described above is only schematic, the such as division of described unit, can be that a kind of logic function divides, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of unit or module or communication connection can be electrical or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple unit.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprises all or part of step of some instructions in order to make a computer equipment (can be personal computer, server or the network equipment etc.) perform method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, ROM (read-only memory) (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), portable hard drive, magnetic disc or CD etc. various can be program code stored medium.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a digital power source method of tracing to the source, is characterized in that, comprising:
The digital signal that digital power source sends by digital quantity analog waveform matching device carries out analog-converted, generates current analog signal and voltage analog signal;
Described current analog signal and described voltage analog signal are sent to standard electric energy meter by described digital quantity analog waveform matching device;
Described standard electric energy meter carries out electric energy calibrating to described current analog signal and described voltage analog signal, generates result of tracing to the source.
2. method according to claim 1, is characterized in that, described standard electric energy meter carries out electric energy calibrating to described current analog signal and voltage analog signal, and the step generating result of tracing to the source comprises:
Described standard electric energy meter generates the performance number of described standard electric energy meter according to described current analog signal and described voltage analog signal;
Described standard electric energy meter receives the performance number of the described digital power source that described digital power source sends;
The performance number of the performance number of described standard electric energy meter and described digital power source is carried out error analysis by described standard electric energy meter, generates result of tracing to the source.
3. method according to claim 1, it is characterized in that, described digital quantity analog waveform matching device at least comprises: network communication module, protocol resolution module, processing module, D/A conversion module, voltage front end power amplifier module and electric current front end power amplifier module, wherein, the digital signal that digital power source sends by described digital quantity analog waveform matching device carries out analog-converted, and the step generating current analog signal and voltage analog signal comprises:
Described network communication module receives described digital signal;
Described digital signal is sent to described protocol resolution module by described network communication module;
Described protocol resolution module is resolved described digital signal and the described digital signal after resolving is sent to described processing module;
Described digital signal after described parsing processes by described processing module, generates Wave data;
Described Wave data is sent to described D/A conversion module and carries out digital-to-analog conversion by described processing module;
Described Wave data after conversion is sent to described voltage front end power amplifier module and described electric current front end power amplifier module by described D/A conversion module, wherein, described voltage front end power amplifier module is used for generating described voltage analog signal according to the described Wave data after described conversion, and described electric current front end power amplifier module is used for generating described current analog signal according to the described Wave data after described conversion.
4. method according to claim 3, is characterized in that, described digital signal is the message meeting the first electric power data communication protocol, and wherein, the step that described protocol resolution module resolves described digital signal comprises:
Described protocol resolution module is resolved the described message meeting the first electric power data communication protocol by fpga chip.
5. method according to claim 3, it is characterized in that, the digital signal after described parsing at least comprises: voltage sample value, current sampling data, wherein, described digital signal after described parsing processes by described processing module, and the step generating Wave data comprises:
Described processing module carries out interpolation processing to described voltage sample value and current sampling data respectively, generates described Wave data.
6. a digital power source system of tracing to the source, is characterized in that, comprising:
Digital power source, for sending digital signal;
Digital quantity analog waveform matching device, for described digital signal is carried out analog-converted, generates current analog signal and voltage analog signal;
Standard electric energy meter, for carrying out electric energy calibrating to described current analog signal and described voltage analog signal, generates result of tracing to the source.
7. system according to claim 6, is characterized in that, described digital quantity analog waveform matching device comprises:
Network communication module, for receiving described digital signal;
Protocol resolution module, for resolving described digital signal and the described digital signal after resolving being sent;
Processing module, for the described digital signal after described parsing being processed, generates Wave data;
D/A conversion module, for changing described Wave data and the described Wave data after conversion being sent to voltage front end power amplifier module and electric current front end power amplifier module;
Described voltage front end power amplifier module, for generating described voltage analog signal according to the described Wave data after described conversion;
Described electric current front end power amplifier module, for generating described current analog signal according to the described Wave data after described conversion.
8. system according to claim 7, is characterized in that, described digital signal is the message meeting the first electric power data communication protocol, and wherein, described protocol resolution module comprises:
Fpga chip, for resolving the described message meeting the first electric power data communication protocol.
9. system according to claim 7, is characterized in that, the digital signal after described parsing at least comprises: voltage sample value, current sampling data, and wherein, described processing module comprises:
Interpolating module, for carrying out interpolation processing to described voltage sample value and current sampling data, generates described Wave data.
10. system according to claim 7, is characterized in that, described D/A conversion module is made up of the D/A converter that 6 tunnels are synchronous.
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