CN104991221A - Device and detection method for calibrating metering device in distributed substation - Google Patents
Device and detection method for calibrating metering device in distributed substation Download PDFInfo
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- CN104991221A CN104991221A CN201510393922.8A CN201510393922A CN104991221A CN 104991221 A CN104991221 A CN 104991221A CN 201510393922 A CN201510393922 A CN 201510393922A CN 104991221 A CN104991221 A CN 104991221A
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Abstract
The invention provides a device and a detection method for calibrating a metering device in a distributed substation. A time standard current source is connected with a current signal sending module. A time standard voltage source is connected with a voltage signal sending module. The time standard current source and the time standard voltage source are connected with a merging unit. The merging unit is connected with a digital watt-hour meter. The digital watt-hour meter is connected with a power pulse capture device. The electric pulse capture device is connected with a wireless communication module. A standard power signal receiving module is in communication connection with the current signal sending module and the voltage signal sending module. The wireless communication module and the standard power signal receiving module are connected with a PC. Time synchronization is realized by adopting a GPS/Beidou timing mode and using 1PPS second pulse. Data transmission is carried out by the wireless communication technology, and the defect that data cannot be transmitted in a wired mode due to long distance between voltage and current transformers is overcome. A time scale standard source technology is adopted to ensure data synchronization.
Description
Technical field
The present invention relates to electric-power metering calibrating field, be specifically related to a kind of device that measuring apparatus in distributed transformer substation is calibrated and detection method.
Background technology
Along with the develop rapidly of the automation of transformation substations and the network communications technology, the promulgation of IEC61850 standards system and implementation, traditional transformer station is progressively to digital transformer substation transition.Digital transformer substation electric flux technology achieves analog quantity after total digitalization in collection, by the transformation that fibre circuit transmits, digital electric energy meter is transferred to by point-to-point or Ethernet mode, for in digital transformer substation, electric energy metered system provides Data Source, form digital transformer substation electric energy metered system.
But, in digital transformer substation electric energy metered system, because the error of voltage transformer (VT), current transformer, the transformed error of merge cells, the error code of transmitting procedure cause the existence being afraid of error and the digital electric energy meter error of calculation etc. link, in digital transformer substation, electric energy metered system can produce certain systematic error, therefore needs to calibrate the power/energy error of digital transformer substation.
Summary of the invention
The present invention provides a kind of device of calibrating the measuring apparatus in distributed transformer substation and detection method according to the deficiencies in the prior art, and structure is simple, easy to operate, accurately and reliably.
Technical scheme of the present invention: a kind of device that measuring apparatus in distributed transformer substation is calibrated, it is characterized in that: normalized current source be connected with current data collector and with GPS/ Big Dipper time service antenna makeup time normalized current source, standard voltage source be connected with voltage data collector and with GPS/ Big Dipper time service antenna makeup time standard voltage source, time standard current source is connected with current signal sending module, time standard voltage source is connected with voltage signal sending module, time standard current source is connected merge cells with time standard voltage source, merge cells connects digital electricity meter, digital electricity meter connects electrical energy pulse acquisition equipment, electrical energy pulse acquisition equipment connects wireless communication module, reference power supply signal receiving module is connected with current signal sending module and the communication of voltage signal sending module, wireless communication module is connected with PC with reference power supply signal receiving module.
Described electrical energy pulse acquisition equipment is also connected with GPS/ Big Dipper time service antenna.
Described merge cells and digital electricity meter pass through Fiber connection.
Time service precision≤100 nanosecond of described GPS/ Big Dipper time service antenna.
The detection method utilizing described device to calibrate the measuring apparatus in distributed transformer substation, is characterized in that: comprise the following steps,
1) digital frequency synthesis technology is adopted, take GPS-1PPS as synchronizing signal, frequency synthesis phase reference signal, adopt the DC digital frequency synthesis technique based on DSP, synthesize the standard signal source synchronous with GPS pulse per second (PPS), export with time target time standard current source and time standard voltage source;
2) electric current of current signal collector and voltage signal collector collection and voltage analog signal are input to merge cells, and simulating signal is converted to digital signal and is transported to digital electricity meter by optical fiber by merge cells;
3) digital electricity meter calculates electric flux by the digital signal received and is electrical energy pulse by electric energy conversion, and electrical energy pulse acquisition equipment is caught electrical energy pulse and is sent to PC by wireless communication module;
4) PC is by reference power supply signal receiving module receiving step 1) in time target time standard current source and time standard voltage source signal calculate electric flux, the electric flux sent with electrical energy pulse acquisition equipment is compared, the error of calculation, thus realize the object of the measuring apparatus in distributed transformer substation being carried out to power/energy calibration.
Described step 1) in the frequency adjustment method step of digital frequency synthesis technology be:
A. F (I)=A is pressed
1* cos (360 ° of * I/N+ θ
1)+A
2* cos (2*360 ° of * I/N+ θ
2)+... + A
ncos (n*360 ° of * I/N+ θ
n) to signal N equal portions, calculate the amplitude of all discrete points of signal, and these amplitudes are arranged according to this stored in data field, as basic wave function;
B. give four-quadrant 16 multiplication DAC wave function by DSP, reduction obtains required simulating signal;
C. the benchmark input by changing DAC carrys out adjusting signal amplitude, changes the phase angle at the beginning of the starting point conditioning signal of waveform;
D. because signal frequency f=fs/N, fs are sample frequency, 1/ Δ fs is sampling time interval, and changing Δ fs can conditioning signal frequency.
Technique effect of the present invention: adopt GPS/ Big Dipper time service mode, utilize 1PPs pulse per second (PPS) to realize time synchronized; Adopt wireless communication technique to carry out data transmission, overcome due to voltage, current transformer spacing distance length cannot by the defect of Data Over Cable; Adopt markers standard source technology, ensure that the synchronism of data; Structure is simple, easy to operate, accurately and reliably.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is detection method process flow diagram.
Number in the figure represents respectively: 1-normalized current source, 2-current data collector, 3-time standard current source, 4-standard voltage source, 5-voltage data collector, 6-time standard voltage source, 7-current signal sending module, 8-voltage signal sending module, 9-merge cells, 10-digital electricity meter, 11-electrical energy pulse acquisition equipment, 12-wireless communication module, 13-reference power supply signal receiving module, 14-PC.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described:
As shown in Figure 1, a kind of device that measuring apparatus in distributed transformer substation is calibrated, it is characterized in that: normalized current source 1 be connected with current data collector 2 and with GPS/ Big Dipper time service antenna makeup time normalized current source 3, standard voltage source 4 be connected with voltage data collector 5 and with GPS/ Big Dipper time service antenna makeup time standard voltage source 6, time standard current source 3 is connected with current signal sending module 7, time standard voltage source 6 is connected with voltage signal sending module 8, time standard current source 3 is connected merge cells 9 with time standard voltage source 6, merge cells 9 connects digital electricity meter 10, digital electricity meter 10 connects electrical energy pulse acquisition equipment 11, electrical energy pulse acquisition equipment 11 connects wireless communication module 12, reference power supply signal receiving module 13 is connected with current signal sending module 7 and voltage signal sending module 8 communication, wireless communication module 12 is connected with PC 14 with reference power supply signal receiving module 13.
Electrical energy pulse acquisition equipment 11 is also connected with GPS/ Big Dipper time service antenna.
Merge cells 9 and digital electricity meter 10 pass through Fiber connection.
Time service precision≤100 nanosecond of GPS/ Big Dipper time service antenna.
As shown in Figure 2, a kind of detection method utilizing described device to calibrate the measuring apparatus in distributed transformer substation, is characterized in that: comprise the following steps,
1) digital frequency synthesis technology is adopted, take GPS-1PPS as synchronizing signal, frequency synthesis phase reference signal, adopt the DC digital frequency synthesis technique based on DSP, synthesize the standard signal source synchronous with GPS pulse per second (PPS), export with time target time standard current source and time standard voltage source;
2) electric current of current signal collector and voltage signal collector collection and voltage analog signal are input to merge cells, and simulating signal is converted to digital signal and is transported to digital electricity meter by optical fiber by merge cells;
3) digital electricity meter calculates electric flux by the digital signal received and is electrical energy pulse by electric energy conversion, and electrical energy pulse acquisition equipment is caught electrical energy pulse and is sent to PC by wireless communication module;
4) PC is by reference power supply signal receiving module receiving step 1) in time target time standard current source and time standard voltage source signal calculate electric flux, the electric flux sent with electrical energy pulse acquisition equipment is compared, the error of calculation, thus realize the object of the measuring apparatus in distributed transformer substation being carried out to power/energy calibration.
Described step 1) in the frequency adjustment method step of digital frequency synthesis technology be:
A. F (I)=A is pressed
1* cos (360 ° of * I/N+ θ
1)+A
2* cos (2*360 ° of * I/N+ θ
2)+... + A
ncos (n*360 ° of * I/N+ θ
n) to signal N equal portions, calculate the amplitude of all discrete points of signal, and these amplitudes are arranged according to this stored in data field, as basic wave function;
B. give four-quadrant 16 multiplication DAC wave function by DSP, reduction obtains required simulating signal;
C. the benchmark input by changing DAC carrys out adjusting signal amplitude, changes the phase angle at the beginning of the starting point conditioning signal of waveform;
D. because signal frequency f=fs/N, fs are sample frequency, 1/ Δ fs is sampling time interval, and changing Δ fs can conditioning signal frequency.
A kind of device calibrated the measuring apparatus in distributed transformer substation of the present invention, adopts GPS/ Big Dipper time service mode, utilizes 1PPs pulse per second (PPS) to realize time synchronized; Adopt wireless communication technique to carry out data transmission, overcome due to voltage, current transformer spacing distance length cannot by the defect of Data Over Cable; Adopt markers standard source technology, ensure that the synchronism of data; Structure is simple, easy to operate, accurately and reliably.
Claims (6)
1. the device that the measuring apparatus in distributed transformer substation is calibrated, it is characterized in that: normalized current source (1) be connected with current data collector (2) and with GPS/ Big Dipper time service antenna makeup time normalized current source (3), standard voltage source (4) be connected with voltage data collector (5) and with GPS/ Big Dipper time service antenna makeup time standard voltage source (6), time standard current source (3) is connected with current signal sending module (7), time standard voltage source (6) is connected with voltage signal sending module (8), time standard current source (3) is connected merge cells (9) with time standard voltage source (6), merge cells (9) connects digital electricity meter (10), digital electricity meter (10) connects electrical energy pulse acquisition equipment (11), electrical energy pulse acquisition equipment (11) connects wireless communication module (12), reference power supply signal receiving module (13) is connected with current signal sending module (7) and voltage signal sending module (8) communication, wireless communication module (12) is connected with PC (14) with reference power supply signal receiving module (13).
2. the device calibrated the measuring apparatus in distributed transformer substation according to claim 1, is characterized in that: described electrical energy pulse acquisition equipment (11) is also connected with GPS/ Big Dipper time service antenna.
3. the device calibrated the measuring apparatus in distributed transformer substation according to claim 1, is characterized in that: described merge cells (9) and digital electricity meter (10) pass through Fiber connection.
4. the device calibrated the measuring apparatus in distributed transformer substation according to claim 1, is characterized in that: time service precision≤100 nanosecond of described GPS/ Big Dipper time service antenna.
5. utilize the detection method that in claim 1-4, arbitrary described device is calibrated the measuring apparatus in distributed transformer substation, it is characterized in that: comprise the following steps,
1) digital frequency synthesis technology is adopted, take GPS-1PPS as synchronizing signal, frequency synthesis phase reference signal, adopt the DC digital frequency synthesis technique based on DSP, synthesize the standard signal source synchronous with GPS pulse per second (PPS), export with time target time standard current source and time standard voltage source;
2) electric current of current signal collector and voltage signal collector collection and voltage analog signal are input to merge cells, and simulating signal is converted to digital signal and is transported to digital electricity meter by optical fiber by merge cells;
3) digital electricity meter calculates electric flux by the digital signal received and is electrical energy pulse by electric energy conversion, and electrical energy pulse acquisition equipment is caught electrical energy pulse and is sent to PC by wireless communication module;
4) PC is by reference power supply signal receiving module receiving step 1) in time target time standard current source and time standard voltage source signal calculate electric flux, the electric flux sent with electrical energy pulse acquisition equipment is compared, the error of calculation, thus realize the object of the measuring apparatus in distributed transformer substation being carried out to power/energy calibration.
6. detection method of calibrating the measuring apparatus in distributed transformer substation according to claim 5, is characterized in that: described step 1) in the frequency adjustment method step of digital frequency synthesis technology be:
A. F (I)=A is pressed
1* cos (360 ° of * I/N+ θ
1)+A
2* cos (2*360 ° of * I/N+ θ
2)+... + A
ncos (n*360 ° of * I/N+ θ
n) to signal N equal portions, calculate the amplitude of all discrete points of signal, and these amplitudes are arranged according to this stored in data field, as basic wave function;
B. give four-quadrant 16 multiplication DAC wave function by DSP, reduction obtains required simulating signal;
C. the benchmark input by changing DAC carrys out adjusting signal amplitude, changes the phase angle at the beginning of the starting point conditioning signal of waveform;
D. because signal frequency f=fs/N, fs are sample frequency, 1/ Δ fs is sampling time interval, and changing Δ fs can conditioning signal frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510393922.8A CN104991221B (en) | 2015-07-07 | 2015-07-07 | The device and detection method calibrated to the metering device in distributed transformer substation |
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|---|---|---|---|
| CN201510393922.8A CN104991221B (en) | 2015-07-07 | 2015-07-07 | The device and detection method calibrated to the metering device in distributed transformer substation |
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| CN104991221A true CN104991221A (en) | 2015-10-21 |
| CN104991221B CN104991221B (en) | 2018-01-30 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842649A (en) * | 2016-03-25 | 2016-08-10 | 国家电网公司 | On-line detection system for secondary side power metering system of smart substation and detection method thereof |
| CN105954705A (en) * | 2016-07-06 | 2016-09-21 | 国网上海市电力公司 | Digital electric energy measuring equipment remote calibration system and method |
| CN106199489A (en) * | 2016-07-06 | 2016-12-07 | 国网上海市电力公司 | Laboratory reproduction type digitalized electric energy measuring equipment remote calibration system and method |
| CN110146762A (en) * | 2019-06-05 | 2019-08-20 | 国网江苏省电力有限公司苏州供电分公司 | A kind of detachable loading tests device suitable for intelligent substation |
| CN110736957A (en) * | 2019-12-12 | 2020-01-31 | 国网江西省电力有限公司电力科学研究院 | Online detection system and method for electric energy metering device based on clock synchronization |
| CN110940854A (en) * | 2019-11-14 | 2020-03-31 | 国网江西省电力有限公司电力科学研究院 | Alternating current synchronous electric energy metering system based on Beidou/GPS clock |
| CN111665377A (en) * | 2020-06-05 | 2020-09-15 | 国网福建省电力有限公司 | Remote phase-locking synchronous standard source |
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| CN102035261A (en) * | 2010-12-17 | 2011-04-27 | 清华大学 | Monitoring system for smart grid |
| US20140340236A1 (en) * | 2013-02-12 | 2014-11-20 | Digimarc Corporation | Synchronized metrology in power generation and distribution networks |
| CN104198980A (en) * | 2014-08-29 | 2014-12-10 | 国家电网公司 | Accuracy evaluation system for digital electric energy meter |
| CN104330765A (en) * | 2014-11-12 | 2015-02-04 | 成都天兴电气有限公司 | Satellite navigation system based electric-energy-meter field calibration device |
| CN204705708U (en) * | 2015-07-07 | 2015-10-14 | 国家电网公司 | To the device that the measuring apparatus in distributed transformer substation is calibrated |
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| CN102035261A (en) * | 2010-12-17 | 2011-04-27 | 清华大学 | Monitoring system for smart grid |
| US20140340236A1 (en) * | 2013-02-12 | 2014-11-20 | Digimarc Corporation | Synchronized metrology in power generation and distribution networks |
| CN104198980A (en) * | 2014-08-29 | 2014-12-10 | 国家电网公司 | Accuracy evaluation system for digital electric energy meter |
| CN104330765A (en) * | 2014-11-12 | 2015-02-04 | 成都天兴电气有限公司 | Satellite navigation system based electric-energy-meter field calibration device |
| CN204705708U (en) * | 2015-07-07 | 2015-10-14 | 国家电网公司 | To the device that the measuring apparatus in distributed transformer substation is calibrated |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842649A (en) * | 2016-03-25 | 2016-08-10 | 国家电网公司 | On-line detection system for secondary side power metering system of smart substation and detection method thereof |
| CN105954705A (en) * | 2016-07-06 | 2016-09-21 | 国网上海市电力公司 | Digital electric energy measuring equipment remote calibration system and method |
| CN106199489A (en) * | 2016-07-06 | 2016-12-07 | 国网上海市电力公司 | Laboratory reproduction type digitalized electric energy measuring equipment remote calibration system and method |
| CN110146762A (en) * | 2019-06-05 | 2019-08-20 | 国网江苏省电力有限公司苏州供电分公司 | A kind of detachable loading tests device suitable for intelligent substation |
| CN110940854A (en) * | 2019-11-14 | 2020-03-31 | 国网江西省电力有限公司电力科学研究院 | Alternating current synchronous electric energy metering system based on Beidou/GPS clock |
| CN110736957A (en) * | 2019-12-12 | 2020-01-31 | 国网江西省电力有限公司电力科学研究院 | Online detection system and method for electric energy metering device based on clock synchronization |
| CN111665377A (en) * | 2020-06-05 | 2020-09-15 | 国网福建省电力有限公司 | Remote phase-locking synchronous standard source |
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| CN104991221B (en) | 2018-01-30 |
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Inventor after: Bi Wei Inventor after: Guo Yu Inventor after: Wang Xueqiong Inventor after: Guo Zichun Inventor after: Shen Li Inventor after: Gan Yiyi Inventor after: Shu Kaiqi Inventor after: Liu Jianhua Inventor after: Li Fan Inventor after: Li Jun Inventor after: Shi Hong Inventor after: Fu Wei Inventor before: Shen Li Inventor before: Wang Sike Inventor before: Bi Wei Inventor before: Gan Yiyi Inventor before: Shu Kaiqi Inventor before: Li Jun Inventor before: Li Fan Inventor before: Guo Yu Inventor before: Liu Heng Inventor before: Zheng Xin |
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