CN100511311C - Power frequency electric power data transfer system - Google Patents
Power frequency electric power data transfer system Download PDFInfo
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- CN100511311C CN100511311C CNB2006100633616A CN200610063361A CN100511311C CN 100511311 C CN100511311 C CN 100511311C CN B2006100633616 A CNB2006100633616 A CN B2006100633616A CN 200610063361 A CN200610063361 A CN 200610063361A CN 100511311 C CN100511311 C CN 100511311C
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- electric power
- power data
- concentrator
- acquisition module
- transfer system
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Abstract
The invention discloses a power-frequency power data transmission system, which comprises a collection module and a power data center. The system also includes a concentrator in the vicinity of a transformer, wherein, the power data center is communicated with the collection module through the concentrator, and the concentrator and the collection module are connected with the same distribution transformer. By adopting the concentrator, the power-frequency power data transmission system obviates the need of the main station entering the power-frequency data transmission system across the transformer without reconstructing secondary substation, thereby reducing the project difficulty and reducing the investment. By obviating long-distance signal transmission across the transformer, the system has greatly reduced signal attenuation, thereby improving the communication signal-to-noise ratio and ensuring the stable and reliable system communication.
Description
[technical field]
The present invention relates to electric power data transfer system, relate in particular to a kind of power frequency electric power data transfer system of not striding transformer.
[background technology]
At present, can utilize line of electric force to be the media transmission data.Can realize by power frequency electric power data transfer system when being the media transmission data with the line of electric force, described power frequency electric power data transfer system is represented information by making electric power 50Hz waveform that faint distortion take place near its voltage over zero, this information can stride across substation transformer and carry out data transmission.
Consult Fig. 1 below, the existing transformer power frequency electric power data transfer system of striding is described.The described transformer power frequency electric power data transfer system of striding comprises main website 101,10kV/0.4kV modulation transformer 102, current transformer 103, acquisition module 104 and electric power data center 105.Described main website 101 is given in 105 issue an orders of described electric power data center, and described main website 101 couples a signal to the 10kV bus by the 10kV/0.4kV modulation transformer, and modulation signal utilizes the inside equivalent reactance effect of main-transformer to produce descending voltage signal.Described descending voltage signal strides across substation transformer and arrives acquisition module 104; Described acquisition module 104 sends the ascending current signal after receiving signal as required, and this signal strides across substation transformer 106 arrival current transformers 103 and gets back to main website 101, returns electric power data center 105 at last.Described ascending current signal is produced by acquisition module 104.In native system, communicating by letter between main website 101 and the acquisition module 104 belongs to point-to-point sequenced communications.
See also Fig. 2, described from main website 101 to acquisition module 104 descending voltage signal, adopt the voltage magnitude modulation to realize, by continuous two voltage cycles definition 1bit data, if represent " bit1 " at the 1st cycle near zero-crossing point overlapped information of continuous two voltage cycles, on the contrary, then represent " bit0 " at the 2nd periodic voltage near zero-crossing point overlapped information; See also Fig. 3,101 information is the ascending current signal from acquisition module 104 to main website, adopt current-modulation, consider that the harmonic wave in the current signal is serious, current signal definition 1bit information by continuous 4 voltage cycle correspondences, 4 voltage cycles have 8 zero crossings, use near wherein 4 superimposed current signal indication bit1 of voltage over zero, remain near the superimposed current signal of 4 voltage over zero and then represent bit0.Stride descending voltage signal of transformer power frequency electric power data transfer system and ascending current signal and form by 64bit, descending voltage signal takies the time of 128 voltage cycles, and the ascending current signal occupies the time of 256 voltage cycles.It is 7.68 second time altogether that a communication cycle of power frequency electric power data transfer system main website 101 and acquisition module 104 needs 384 50Hz voltage cycles approximately.In order to modulate the descending voltage signal that main website 101 sends, need transform electric substation, add modulation transformer 102, main website 101 receives the 10KV branch line current transformer 103 extraction upward signals that pass through secondary substation from the ascending current signal of acquisition module 104,10KV branch line current transformer 103 need be serially connected with in the main website 101 built-in current mutual inductors.Described acquisition module 104 receives from the downlink information of main website and realizes by near the Microsoft's distortion the detection voltage over zero.As shown in Figure 4, striding the transformer power frequency electric power data transfer system is the half-duplex transmission mode, the information transmission in proper order respectively A send mutually, the A Phase Receiver, send mutually for B afterwards, the B Phase Receiver.Send mutually for C at last, the C Phase Receiver.Need and master station communication if having 10000 acquisition modules, need about 76800 seconds of time spent.
But, existing stride the transformer power frequency electric power data transfer system and have following problem:
(1) main website is positioned at secondary substation, and acquisition module is positioned at the resident, and distance is often far away between the two, and modulation signal is owing to need stride across transformer and carry out long-distance transmissions, and signal attenuation is very big, causes in the practical communication process input unreliable;
(2) main website is positioned at secondary substation, need add modulation transformer to the secondary substation transformation that has a power failure, the serial connection current transformer, and quantities is big;
(3) power frequency electric power data transfer system is in order to evade the influence of current harmonics, upward signal adopts two voltage cycle definition 1bit information, main website and acquisition module adopt A, B, C three phase sequences to send signal simultaneously, main website and acquisition module belong to point-to-point communication, and this Several Factors causes call duration time very long.
[summary of the invention]
Technical matters to be solved by this invention is, a kind of power frequency electric power data transfer system is provided, and solves big, the transformation problem that secondary substation is great in constructing amount, call duration time is long of signal attenuation in the existing power frequency electric power data transfer system.
The technical solution adopted in the present invention is: a kind of power frequency electric power data transfer system is provided, comprise acquisition module and electric power data center, described power frequency electric power data transfer system also comprises near the concentrator that is positioned at the substation transformer, described electric power data center and described acquisition module carry out data communication by described concentrator, the signal that described acquisition module is transferred to concentrator is up voltage signal, described acquisition module is transferred to the up voltage signal of described concentrator and realizes by the voltage modulated mode, with continuous two voltage cycles definition 1bit information.
More specifically, described concentrator and described acquisition module are connected in same substation transformer.
More specifically, described concentrator by GPRS, dial up on the telephone or GSM and described electric power data center communicate.
More specifically, described concentrator is modulated descending voltage signal and is transferred to described acquisition module after receiving the order of electric power data center transmission.
Adopt A, B, the parallel mode that receives that sends of C three-phase to communicate when more specifically, described concentrator and acquisition module communicate.
More specifically, the mode of described concentrator employing voltage detecting receives the up voltage signal from described acquisition module.
More specifically, described acquisition module can be for having the intelligent electric meter of collection, measurement, communication function, or have the ammeter of collection, communication function.
The present invention compared with prior art, beneficial effect is: power frequency electric power data transfer system of the present invention increases concentrator near transformer, cancelled the main website of striding the transformer power frequency electric power data transfer system, do not need secondary substation is transformed, reduce the engineering difficulty, reduced investment.The signal of described acquisition module only need be transferred to and be positioned near the concentrator of substation transformer, and signal does not need to stride the long Distance Transmission of transformer, and the decay of signal significantly reduces, and the communication signal to noise ratio (S/N ratio) of system is improved, and has guaranteed the stable, reliable of system communication.Upward signal from the acquisition module to the concentrator adopts voltage modulated rather than current-modulation, and concentrator detects upward signal and adopts voltage detecting, does not need the current sensor of frequency communication system, makes the installation of concentrator become simple; Upward signal adopts two continuous voltage period definition 1bit information, for striding the transformer power frequency electric power data transfer system, the uplink signal transmissions time decreased half; The present invention adopts A, B, the parallel sent-received message of C three-phase, call duration time shortens 2/3 on the basis in the above again, simultaneously, near the concentrator each substation transformer can be communicated by letter with the acquisition module below the concentrator simultaneously, has improved communication efficiency, has shortened call duration time.
[description of drawings]
Fig. 1 is the existing transformer power frequency electric power data transfer system figure that strides.
Fig. 2 is the existing definition figure that strides transformer power frequency electric power data transfer system downgoing signal.
Fig. 3 is the existing transformer power frequency electric power data transfer system upward signal definition figure that strides.
Fig. 4 is the existing transformer power frequency electric power data transfer system communication sequence figure that strides.
Fig. 5 is a power frequency electric power data transfer system synoptic diagram of the present invention.
Fig. 6 is power frequency electric power data transfer system downgoing signal definition figure of the present invention.
Fig. 7 is frequency electric power data transfer system upward signal definition figure of the present invention.
Fig. 8 is power frequency electric power data transfer system communication sequence figure of the present invention.
[embodiment]
See also Fig. 5, Fig. 5 is a kind of power frequency electric power data transfer system synoptic diagram of the present invention.
Power frequency electric power data transfer system of the present invention comprises electric power data center 201, is positioned at transformer neighbouring concentrator 202 and acquisition module 203.Described electric power data center and described acquisition module carry out data communication by described concentrator.
Described electric power data center 201 and described acquisition module 203 carry out data communication by described concentrator 20.Described concentrator 202 and described acquisition module 203 are powered by same substation transformer.Described electric power data center 201 by GPRS, dial up on the telephone, GSM or alternate manner send order to described concentrator 202, concentrator 202 produces signal according to order and gives described acquisition module 203, described acquisition module 203 receives to send behind the signal of described concentrator 202 and feeds back signal to described concentrator 202, described concentrator 202 by GPRS, dial up on the telephone, GSM or alternate manner feed back to described electric power data center 201.
Described electric power data center 201 is positioned at power supply administration, comprises that the application program of communicating by letter with described concentrator reaches and the interface routine of other system of power supply administration.
After described concentrator 202 is received the order of electric power data center 201 transmissions, modulate descending voltage signal again and be transferred to acquisition module 203, described acquisition module 203 returns up voltage modulation signal to described concentrator 202 according to the order at electric power data center 201 after receiving descending voltage modulation signal, and described concentrator 202 is given the electric power data center with decoded data transmission again.In each substation transformer service area, the communication between concentrator 202 and the acquisition module 203 can walk abreast and finish in the power frequency electric power data transfer system of the present invention.
Described acquisition module 206 can be for having the intelligent electric meter of collection, measurement, communication function, or have the ordinary electric meter of collection, communication function.
See also the upward signal definition of striding the transformer power frequency electric power data transfer system among Fig. 3, with 8 near zero-crossing point superposition modulated signal 3 expression information of 4 current cycles 2 of continuous 4 voltage cycle 1 correspondences.If at a, c, f, h position superposition modulated signal indication " bit1 ", correspondence is then represented " bit0 " at j, l, m, o position superposition modulated signal.
Fig. 6, Fig. 7 are the definition of descending voltage signal of the present invention and up voltage signal, as can be seen, in the present invention, descending voltage signal and up voltage signal all adopt 1 information of continuous two voltage cycles definition, and all adopt voltage modulated to realize, near superposition modulated signal indication " bit1 " preceding 1 voltage over zero of continuous two voltage cycles, near correspondence superposition modulated signal indication " bit0 " back 1 voltage over zero of continuous two voltage cycles.Certainly, also can define conversely, i.e. near superposition modulated signal indication " bit1 " back 1 voltage over zero at continuous two voltage cycles, corresponding near preceding 1 voltage over zero of continuous two voltage cycles superposition modulated signal indication " bit0 ".
Fig. 8 is data transmission system communication sequence figure of the present invention, adopts A, B, the parallel transmitting-receiving of C three-phase to communicate in proper order, the alternate time delay that the 13.3ms time-delay that marks among the figure brings for A, B, C three-phase 120 degree phase differential.
From concentrator 202 to acquisition module 203 descending voltage signal and from acquisition module 203 to concentrator 202 up voltage signal all adopts two continuous voltage cycles definition 1bit, 128 voltage cycles of downlink information add 128 voltage cycles of up voltage signal like this, message length amounts to 256 voltage cycles, and concentrator 202 detects the up voltage signal of acquisition module 203 and also realizes by detecting near the voltage distortion of voltage over zero; When communicating by letter with acquisition module 203, adopt by concentrator 202 A, B, the parallel mode that sends, receives of C three-phase to communicate.After being A phase voltage near zero-crossing point modulation signal, modulate the B phase information at B phase voltage near zero-crossing point after crossing 13.3ms approximately, modulate the C phase information after 13.3ms at C phase voltage near zero-crossing point afterwards, here the mistiming of 13.3ms is because of differing 120 degree projections in time between electric power 50Hz waveform A, B, the C three-phase voltage, also 3 phase parallel receives during reception information, cross 13.3ms reception B phase information after promptly receiving A phase uplink information, receive the C phase information after 13.3ms.
Claims (7)
1, a kind of power frequency electric power data transfer system, comprise acquisition module and electric power data center, it is characterized in that, described power frequency electric power data transfer system also comprises near the concentrator that is positioned at the substation transformer, described electric power data center and described acquisition module carry out data communication by described concentrator, the signal that described acquisition module is transferred to concentrator is up voltage signal, described acquisition module is transferred to the up voltage signal of described concentrator and realizes by the voltage modulated mode, with continuous two voltage cycles definition 1bit information.
2, power frequency electric power data transfer system as claimed in claim 1 is characterized in that, described concentrator and described acquisition module are connected in same substation transformer.
3, power frequency electric power data transfer system as claimed in claim 1 is characterized in that, described concentrator by GPRS, dial up on the telephone or GSM mode and described electric power data center communicate.
4, power frequency electric power data transfer system as claimed in claim 1 is characterized in that, described concentrator is modulated descending voltage signal and is transferred to described acquisition module after receiving the order of described electric power data center transmission.
5, power frequency electric power data transfer system as claimed in claim 1 is characterized in that, adopts A, B, the parallel mode that receives that sends of C three-phase to communicate when described concentrator and acquisition module communicate.
6, power frequency electric power data transfer system as claimed in claim 1 is characterized in that, the mode of described concentrator employing voltage detecting receives the up voltage signal from described acquisition module.
7, power frequency electric power data transfer system as claimed in claim 1 is characterized in that, described acquisition module can be for having the intelligent electric meter of collection, measurement, communication function, or have the ammeter of collection, communication function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100633616A CN100511311C (en) | 2006-10-27 | 2006-10-27 | Power frequency electric power data transfer system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100633616A CN100511311C (en) | 2006-10-27 | 2006-10-27 | Power frequency electric power data transfer system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101169895A CN101169895A (en) | 2008-04-30 |
| CN100511311C true CN100511311C (en) | 2009-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100633616A Expired - Fee Related CN100511311C (en) | 2006-10-27 | 2006-10-27 | Power frequency electric power data transfer system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101980415B (en) * | 2010-10-09 | 2012-10-10 | 华北电力大学 | Method and system for implementing active uplink power line power-frequency communication |
| CN105319422A (en) * | 2014-06-25 | 2016-02-10 | 国家电网公司 | Load controllable electricity information acquisition system |
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