CN103837855A - Digital standard source based on precise time control - Google Patents
Digital standard source based on precise time control Download PDFInfo
- Publication number
- CN103837855A CN103837855A CN201410057298.XA CN201410057298A CN103837855A CN 103837855 A CN103837855 A CN 103837855A CN 201410057298 A CN201410057298 A CN 201410057298A CN 103837855 A CN103837855 A CN 103837855A
- Authority
- CN
- China
- Prior art keywords
- module
- time control
- precise time
- digital
- source based
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Electric Clocks (AREA)
- Communication Control (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a digital standard source based on precise time control. The digital standard source based on precise time control comprises a man-machine interface module, a signal processing and system control module, a digital waveform sequence storage module, a precise time control and protocol conversion module and an output interface module, wherein the man-machine interface module, the signal processing and system control module, the precise time control and protocol conversion module and the output interface module are connected in sequence; the digital waveform sequence storage module is connected with the signal processing and system control module. The digital standard source based on precise time control can simulate output of an on-site merging unit really and output digital messages according with the IEC 61850-9-1/2/2LE statute format, the number of ASDUs, the number of sampling points, and other communication parameters can be configured flexibly, influence on precision drift caused by ambient temperature or long-time working can be eliminated, the sent messages have time controllability, time control precision is superior to 100 ns, and the disperse degree of the messages is superior to 500 ns.
Description
Technical field
The present invention relates to a kind of digital standard source based on precise time control, can be used for calibrating digitalized electrical energy meter.
Background technology
Digital electric energy meter in Intelligent transformer station uses optical fiber to receive the digital quantity signal of the electric current and voltage of electronic mutual inductor and merge cells transmission conventionally, therefore, digitalized electric energy Watch Error is mainly caused by Algorithm Error, the communication protocol standard bit error rate and data transmission period time delay etc.
In standard GB/T/T17215.303 " electrical measuring device digitalized electrical energy meter particular/special requirement ", provide a kind of method that adopts standard digital power source to calibrate for error to digitalized electrical energy meter.But, in existing digitizing power source, because what mostly adopt is the framework of DSP+ARM, IEC61850-9-1 to output, the transmission frame sequence sequential of IEC61850-9-2 digitizing message cannot accurately be controlled, cannot simulate a desirable standard digital power source, do not meet the message discrete value requirement of merge cells, the output of yet cannot real simulation intelligent substation on-the-spot electronic type mutual inductance and merge cells.
Summary of the invention
Object: in order to overcome the deficiencies in the prior art, the invention provides a kind of digital standard source based on precise time control.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of digital standard source based on precise time control, it is characterized in that: comprise human-machine interface module, signal processing and system control module, digital waveform sequence memory module, precise time control and protocol conversion module, output interface module, described human-machine interface module, signal processing and system control module, precise time control and protocol conversion module, output interface module are connected successively; Described digital waveform sequence memory module is processed and is connected with system control module with signal.
The described digital standard source based on precise time control, it is characterized in that: described human-machine interface module finishing man-machine interaction function, process and system control module two-way communication by serial ports and signal, the parameter of output voltage current signal is set and the sampling rate of simulating merge cells is set, output control command and demonstration digital quantity shape information.
The described digital standard source based on precise time control, is characterized in that: described signal processing and system control module complete digital matching and the system control function of output signal, according to the standardized digital signal accurate Calculation electric energy of output, and output electrical energy pulse.
The described digital standard source based on precise time control, is characterized in that: described signal processing is connected with described digital waveform sequence memory module with system control module, and three-phase voltage current Wave data is stored in to described digital waveform sequence memory module.
The described digital standard source based on precise time control, it is characterized in that: described signal processing is connected with protocol conversion module with described precise time control with system control module, for described precise time control and protocol conversion module provide time reference signal and Transfer Parameters, parameter comprises count value, configuration ASDU number, the sampling number of timing.Described digital waveform sequence memory module storage digital waveform data.
The described digital standard source based on precise time control, it is characterized in that: described precise time control and protocol conversion module call the Wave data being stored in digital waveform sequence memory module and complete the conversion of digital waveform data to IEC61850-9-1/2/2LE message, and the output of generation time control message.
The described digital standard source based on precise time control, is characterized in that: described output interface module is connected with protocol conversion module with precise time control, completes the physical connection of Ethernet interface.
Beneficial effect: the digital standard source based on precise time control provided by the invention, adopt stored program control system to realize the output of simulated field electronic mutual inductor and merge cells, the digitizing message of output meets IEC61850-9-1/2/2LE rule schemata, can flexible configuration ASDU number, the messaging parameter such as sampling number, can eliminate the impact that is subject to environment temperature or long-term work to cause precision drift, and the message sending has time controllability, time control accuracy can realize and be better than 100ns, and message dispersion is better than 500ns.
Brief description of the drawings
Fig. 1 is system architecture diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, a kind of digital standard source based on precise time control, comprises human-machine interface module, signal processing and system control module, digital waveform sequence memory module, precise time control and protocol conversion module, output interface module.
Described human-machine interface module adopts the LX-801A industrial computer of Seatech, uses the capacitance touch screen of 800*600, and finishing man-machine interaction arranges the sampling rate of amplitude, frequency, phase place and the simulation merge cells of output signal, the functions such as display waveform.
Described digital waveform sequence memory module is used the SDRAM chip MT48LC32M16A2TG of 64MB, processes and the digital waveform data of the three-phase voltage current of system control module generation for storage signal.
Described signal processing and system control module adopt the High Performance DSP processor B F533 of ADI company, BF533 adopts the kernel of micro-signal structure that digital signal processing and microcontroller function are integrated into single product kernel, avoid needing an independently independently microcontroller of dsp processor and simultaneously, simplified design and the realization of software and hardware.BF533 uses double precision algorithm to produce the Wave data of three-phase voltage current on software, realizes the digital matching of analog voltage current signal, and according to waveform digital data accurate Calculation electric energy, output electrical energy pulse.
Digital waveform fit procedure is:
The waveform generation function of an ideal sinusoidal signal is
Y (t)=Asin (2 π ft+ φ) formula (1)
The amplitude A of formula (1) is produced by double precision algorithm, and there is quantization error value, the time t of output also cannot send continuously, by precise time control and protocol conversion module interval T s control chronologically output, formula (1) discretize and digitized formula are rewritten as formula (2)
N is the quantization digit of DSP, and Ts is discrete interval, the output valve that Di is DSP.
For formula of reduction makes the cycle of sinusoidal signal be
initial phase φ=0, formula (2) can further be rewritten as formula (3)
If the waveform fitting point in each cycle of sinusoidal signal for N namely
formula (3) is finally reduced to
By being Wave data Di by the sample value of the definite discrete series of formula (4), be stored in digital waveform sequence memory module, complete the waveform fitting of signal.
Described precise time control and protocol conversion module adopt the fpga chip A3P250 of ACTEL company, the pulse per second (PPS) that FPGA sends according to DSP, the calibration of base while completing FPGA itself, read the data that are stored in digital waveform sequence memory module, then the parameter of transmitting according to DSP completes the conversion of digital waveform data to IEC61850-9-1/2/2LE message, and agreement is defaulted as IEC61850-9-2 message; The message sending has time controllability, if FPGA adopts internal counter to complete the sampling rate of timing T(4kHz, T is 250us), the T time of being often separated by sends a message, and message is exported through output interface module.
Because timer uses system clock timing, system clock will obtain after crystal oscillator frequency frequency multiplication by PLL, so the factor that impact sends message dispersion mainly contains: crystal oscillator degree of stability, the time accuracy of timing T and the delay time of output interface module.The dominant frequency of FPGA is 100M, and the time accuracy of timing T is 10ns; Output interface module adopts RTL8201PHY chip, and the representative value of its transmission delay is 70ns; So, meet to time precision 100ns and send the requirement of message dispersion 500ns.
Described output interface module adopts two PHY chip RTL8201, and a slice RTL8201 and RJ45 interface complete the physical connection of electric Ethernet, and another sheet RTL8201 completes the physical connection of the Ethernet of light with photoelectric conversion module AFBR5803.
The above is only the preferred embodiment of the present invention; be noted 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 (7)
1. the digital standard source based on precise time control, it is characterized in that: comprise human-machine interface module, signal processing and system control module, digital waveform sequence memory module, precise time control and protocol conversion module, output interface module, described human-machine interface module, signal processing and system control module, precise time control and protocol conversion module, output interface module are connected successively; Described digital waveform sequence memory module is processed and is connected with system control module with signal.
2. the digital standard source based on precise time control according to claim 1, it is characterized in that: described human-machine interface module finishing man-machine interaction function, process and system control module two-way communication by serial ports and signal, the parameter of output voltage current signal is set and the sampling rate of simulating merge cells is set, output control command and demonstration digital quantity shape information.
3. the digital standard source based on precise time control according to claim 1, it is characterized in that: described signal processing and system control module complete digital matching and the system control function of output signal, according to the standardized digital signal accurate Calculation electric energy of output, output electrical energy pulse.
4. the digital standard source based on precise time control according to claim 1, it is characterized in that: described signal processing is connected with described digital waveform sequence memory module with system control module, and three-phase voltage current Wave data is stored in to described digital waveform sequence memory module.
5. the digital standard source based on precise time control according to claim 1, it is characterized in that: described signal processing is connected with protocol conversion module with described precise time control with system control module, for described precise time control and protocol conversion module provide time reference signal and Transfer Parameters, parameter comprises count value, configuration ASDU number, the sampling number of timing.
6. the digital standard source based on precise time control according to claim 1, it is characterized in that: described precise time control and protocol conversion module call the Wave data being stored in digital waveform sequence memory module and complete the conversion of digital waveform data to IEC61850-9-1/2/2LE message, and the output of generation time control message.
7. according to the digital standard source based on precise time control described in claim 1 to 6 any one, it is characterized in that: described output interface module is connected with protocol conversion module with precise time control, completes the physical connection of Ethernet interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410057298.XA CN103837855B (en) | 2014-02-20 | 2014-02-20 | Based on the digital standard source that precise time controls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410057298.XA CN103837855B (en) | 2014-02-20 | 2014-02-20 | Based on the digital standard source that precise time controls |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103837855A true CN103837855A (en) | 2014-06-04 |
| CN103837855B CN103837855B (en) | 2016-07-06 |
Family
ID=50801558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410057298.XA Active CN103837855B (en) | 2014-02-20 | 2014-02-20 | Based on the digital standard source that precise time controls |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103837855B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698422A (en) * | 2015-03-25 | 2015-06-10 | 国家电网公司 | Digital micro-differential vector source |
| CN105099656A (en) * | 2015-08-20 | 2015-11-25 | 中国电力科学研究院 | Encrypted merging unit for metering |
| CN108445440A (en) * | 2018-06-19 | 2018-08-24 | 国网山西省电力公司计量中心 | Dynamic distortion load power source with analog quantity and digital quantity doubleway output |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336264A (en) * | 2013-06-07 | 2013-10-02 | 国家电网公司 | Digital electric energy meter quantity value tracing system based on analog quantity detection and digital electric energy meter quantity value tracing method based analog quantity detection |
| CN103439900A (en) * | 2013-08-06 | 2013-12-11 | 国家电网公司 | SMV message controller for achieving precise time control based on FPGA and method thereof |
| CN103543430A (en) * | 2013-09-27 | 2014-01-29 | 广东电网公司电力科学研究院 | Standard modulus synchronous signal source |
-
2014
- 2014-02-20 CN CN201410057298.XA patent/CN103837855B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336264A (en) * | 2013-06-07 | 2013-10-02 | 国家电网公司 | Digital electric energy meter quantity value tracing system based on analog quantity detection and digital electric energy meter quantity value tracing method based analog quantity detection |
| CN103439900A (en) * | 2013-08-06 | 2013-12-11 | 国家电网公司 | SMV message controller for achieving precise time control based on FPGA and method thereof |
| CN103543430A (en) * | 2013-09-27 | 2014-01-29 | 广东电网公司电力科学研究院 | Standard modulus synchronous signal source |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698422A (en) * | 2015-03-25 | 2015-06-10 | 国家电网公司 | Digital micro-differential vector source |
| CN105099656A (en) * | 2015-08-20 | 2015-11-25 | 中国电力科学研究院 | Encrypted merging unit for metering |
| CN105099656B (en) * | 2015-08-20 | 2020-01-03 | 中国电力科学研究院 | Encrypted merging unit for metering |
| CN108445440A (en) * | 2018-06-19 | 2018-08-24 | 国网山西省电力公司计量中心 | Dynamic distortion load power source with analog quantity and digital quantity doubleway output |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103837855B (en) | 2016-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103543430B (en) | Standard modulus synchronous signal source | |
| CN202421768U (en) | Multifunctional time synchronization calibrator for electric power systems | |
| CN103837738B (en) | Electric parameters transducer | |
| CN101795019A (en) | Soft core based merging unit of photoelectric current transformers | |
| CN202217149U (en) | High-precision electric time synchronizer | |
| CN103837855A (en) | Digital standard source based on precise time control | |
| CN102902879A (en) | Synchronous phasor calculation method based on discrete Fourier transform (DFT) recursion of field programmable gate array (FPGA) hardware | |
| CN105911495A (en) | Analog standard source with IEC61850 digital interface and testing method thereof | |
| CN103901384A (en) | Device and method for detecting analog quantity output standard power source and digital quantity output standard power source | |
| CN102928805B (en) | Multi-epitope digitalized electrical energy meter tester | |
| CN104062617A (en) | Merging-unit metrological-characteristic on-site detecting system and method thereof | |
| CN103983930B (en) | Electronic mutual inductor harmonic wave tester calibration equipment and method of calibration | |
| CN108490251A (en) | A kind of digital electric energy metering device meeting 3/2 wiring | |
| CN103983878A (en) | Relay protection synchronization performance testing system and method based on random discrete time domain | |
| CN204116594U (en) | Based on the electric energy meter remote calibration device of satellite navigation system | |
| CN103383443A (en) | Modularized three-phase instrument calibrating device for smart grid | |
| CN210109209U (en) | Synchronous phasor measuring device for power distribution network | |
| CN204129207U (en) | Electric energy measuring equipment on-site calibrator | |
| CN203811797U (en) | Analog electrician/electronic signal and digital signal electric energy meter verification apparatus | |
| CN105785085A (en) | Merging unit detection analog source based on synchronous clock signal, and output method thereof | |
| CN103954924A (en) | Measuring device and method for measurement errors of electric measurement meter in frequency fluctuation process | |
| CN202305789U (en) | Sampling system of electric energy meter calibrating device for performing dual-track system error calculation | |
| CN104348468A (en) | Pulse width self-adaptive single-bus receiver | |
| CN203368439U (en) | Pulse-width self-adaptive single bus receiver | |
| CN203811793U (en) | Analog quantity and IEC61850 digital quantity output standard power source detection apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |