CN103837855B - Based on the digital standard source that precise time controls - Google Patents
Based on the digital standard source that precise time controls Download PDFInfo
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- CN103837855B CN103837855B CN201410057298.XA CN201410057298A CN103837855B CN 103837855 B CN103837855 B CN 103837855B CN 201410057298 A CN201410057298 A CN 201410057298A CN 103837855 B CN103837855 B CN 103837855B
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Abstract
The invention discloses a kind of digital standard source controlled based on precise time, controlling and protocol conversion module, output interface module including human-machine interface module, signal processing and system control module, digital waveform sequence memory module, precise time, described human-machine interface module, signal processing and system control module, precise time control and protocol conversion module, output interface module are sequentially connected with；Described digital waveform sequence memory module is connected with signal processing and system control module.The digital standard source controlled based on precise time provided by the invention, the output of unit can be merged by simulated field really, output meets the digitized message of IEC61850-9-1/2/2LE rule schemata, can the messaging parameter such as flexible configuration ASDU number, sampling number, can eliminate ambient temperature or long-term work causes the impact of precision drift, and the message sent has time controllability, time control accuracy is better than 100ns, and message dispersion is better than 500ns.
Description
Technical field
The present invention relates to a kind of digital standard source controlled based on precise time, can be used for calibrating digitalized electrical energy meter.
Background technology
Digital electric energy meter in Intelligent transformer station generally uses optical fiber receive electronic mutual inductor and merge the digital quantity signal of the voltage x current that unit sends, 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..
Standard GB/T/T17215.303 " electrical measuring device digitalized electrical energy meter particular/special requirement " provides a kind of method adopting standard digital power source that digitalized electrical energy meter is calibrated for error.But, in existing digitized power source, because what mostly adopt is the framework of DSP+ARM, the transmission frame sequence sequential of IEC61850-9-1, IEC61850-9-2 digitized message of output cannot accurately be controlled, a desirable standard digital power source cannot be simulated, do not meet the message centrifugal pump requirement merging unit, cannot truly simulate the electronic type mutual inductance of intelligent substation scene yet and merge the output of unit.
Summary of the invention
Purpose: in order to overcome the deficiencies in the prior art, the present invention provides a kind of digital standard source controlled based on precise time.
Technical scheme: for solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of digital standard source controlled based on precise time, it is characterized in that: include human-machine interface module, signal processing and system control module, digital waveform sequence memory module, precise time and 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 sequentially connected with；Described digital waveform sequence memory module is connected with signal processing and system control module.
The described digital standard source controlled based on precise time, it is characterized in that: described human-machine interface module finishing man-machine interaction function, by serial ports and signal processing and system control module two-way communication, the parameter of output voltage current signal it is set and the sample rate of hypothetical mergers unit is set, exporting control command and display digit amount shape information.
The described digital standard source controlled based on precise time, it is characterised in that: described signal processing and system control module complete digital water transfer and the system control function of output signal, accurately calculate electric energy according to the standardized digital signal of output, export electrical energy pulse.
The described digital standard source controlled based on precise time, it is characterised 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 described digital waveform sequence memory module.
The described digital standard source controlled based on precise time, it is characterized in that: described signal processing is connected with the control of described precise time and protocol conversion module with system control module, controlling for described precise time and protocol conversion module provides time reference signal and Transfer Parameters, parameter includes the count value of timing, configuration ASDU number, sampling number.Described digital waveform sequence memory module storage digital waveform data.
The described digital standard source controlled based on precise time, it is characterized in that: described precise time controls and protocol conversion module calls the Wave data being stored in digital waveform sequence memory module and completes the digital waveform data conversion to IEC61850-9-1/2/2LE message, and the time that produces controls message output.
The described digital standard source controlled based on precise time, it is characterised in that: described output interface module controls with precise time and protocol conversion module is connected, and completes the physical connection of Ethernet interface.
Beneficial effect: the digital standard source controlled based on precise time provided by the invention, stored program control system is adopted to achieve simulated field electronic mutual inductor and merge the output of unit, the digitized message of output meets IEC61850-9-1/2/2LE rule schemata, can the messaging parameter such as flexible configuration ASDU number, sampling number, the impact being caused precision drift by ambient temperature or long-term work can be eliminated, and the message sent has time controllability, time control accuracy can realize being better than 100ns, and message dispersion is better than 500ns.
Accompanying drawing explanation
Fig. 1 is the system architecture diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
As it is shown in figure 1, a kind of digital standard source controlled based on precise time, control and protocol conversion module, output interface module including human-machine interface module, signal processing and system control module, digital waveform sequence memory module, precise time.
The functions such as described human-machine interface module adopts the LX-801A industrial computer of Seatech, uses the capacitance touch screen of 800*600, finishing man-machine interaction, arranges the sample rate of the output amplitude of signal, frequency, phase place and hypothetical mergers unit, display waveform.
Described digital waveform sequence memory module uses the SDRAM chip MT48LC32M16A2TG of 64MB, for storing the digital waveform data of the three-phase voltage current of signal processing and system control module generation.
Described signal processing and system control module adopt the High Performance DSP processor BF533 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 simultaneously need to an independent dsp processor and an independent microcontroller, simplify 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, it is achieved the digital water transfer of analog voltage current signal, and accurately calculates electric energy according to climate digital amount data, exports electrical energy pulse.
Digital waveform fit procedure is:
The waveform generating functon of one 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 continuously transmit, controlled by precise time and protocol conversion module interval Ts chronologically controls output, then formula (1) discretization and digitized formula are rewritten as formula (2)
Formula (2)
N is the quantization digit of DSP, and Ts is discrete interval, and Di is the output valve of DSP.
The cycle making sinusoidal signal in order to simplify formula isInitial phase φ=0, formula (2) can be further rewritten as formula (3)
If the waveform fitting point in each cycle of sinusoidal signal be N namelyThen formula (3) is finally reduced to
The sample value of the discrete series will determined by formula (4) and Wave data Di, be stored in digital waveform sequence memory module, complete the waveform fitting of signal.
The control of described precise time and protocol conversion module adopt the fpga chip A3P250 of ACTEL company, FPGA is according to the DSP pulse per second (PPS) sent, complete the calibration of base during FPGA itself, read the data being stored in digital waveform sequence memory module, then the parameter according to DSP transmission completes the digital waveform data conversion to IEC61850-9-1/2/2LE message, and agreement is defaulted as IEC61850-9-2 message；The message sent has time controllability, if FPGA adopts internal counter to carry out the sample rate of completion timing T(4kHz, T is 250us), T time of being often separated by sends a message, and message exports through output interface module.
Owing to intervalometer uses system clock timing, system clock is obtained after crystal oscillator frequency frequency multiplication by PLL, so, impact sends the factor of message dispersion mainly to be had: the delay time of crystal oscillator degree of stability, the time accuracy of timing T and 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, the requirement of precision 100ns and transmission message dispersion 500ns when satisfied pair.
Described output interface module adopts two panels PHY chip RTL8201, and a piece of RTL8201 and RJ45 interface completes the physical connection of the Ethernet of electricity, and another sheet RTL8201 then 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; it is noted that, for those skilled in the art; under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (2)
1. the digital standard source controlled based on precise time, it is characterized in that: include human-machine interface module, signal processing and system control module, digital waveform sequence memory module, precise time and 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 sequentially connected with；Described digital waveform sequence memory module is connected with signal processing and system control module；
Described human-machine interface module finishing man-machine interaction function, by serial ports and signal processing and system control module two-way communication, arranges the parameter of output voltage current signal and arranges the sample rate of hypothetical mergers unit, exporting control command and display digit amount shape information；
Described signal processing and system control module complete digital water transfer and the system control function of output signal, accurately calculate electric energy according to the standardized digital signal of output, export electrical energy pulse；
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 described digital waveform sequence memory module；
Described signal processing is connected with the control of described precise time and protocol conversion module with system control module, controlling for described precise time and protocol conversion module provides time reference signal and Transfer Parameters, parameter includes the count value of timing, configuration ASDU number, sampling number；
Described precise time controls and protocol conversion module calls the Wave data being stored in digital waveform sequence memory module and completes the digital waveform data conversion to IEC61850-9-1/2/2LE message, and the time that produces controls message output.
2. the digital standard source controlled based on precise time according to claim 1, it is characterised in that: described output interface module controls with precise time and protocol conversion module is connected, and completes the physical connection of Ethernet interface.
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| CN104698422A (en) * | 2015-03-25 | 2015-06-10 | 国家电网公司 | Digital micro-differential vector source |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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