CN102025194B - Power frequency communication synchronous detection method and device for industrial power grid - Google Patents
Power frequency communication synchronous detection method and device for industrial power grid Download PDFInfo
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Abstract
The invention discloses a power frequency communication synchronous detection method and device for an industrial power grid, belonging to the technical field of power system network structure and communication. The power frequency communication synchronous detection device for the industrial power grid is formed by connecting a master station device and a telecommunication terminal of a distribution transformer end to a high voltage transmission line of a substation; down driving equipment in the master station device firstly sends synchronous information based on M sequence coding before sending down data information; when the communication terminal receives a signal, a composite signal is formed according to modulation coding, and the synchronous detection is realized on the composite signal through short-window Morlet complex wavelet transformation; after the synchronous detection is successful, the communication terminal can carry out data demodulation; because the synchronous information can be enhanced and does not need a detection threshold, the invention adapts to the severe channel environment of the industrial power grid and can utilize a house transformer of the substation as a signal modulation transformer, thereby greatly facilitating the application of power frequency communication in the industrial power grid.
Description
Technical field
The invention belongs to power system network structure and communication technical field, particularly a kind of frequency communication synchronization detecting method and device for industrial electrical network.
Background technology
In industrial electrical network, high power motor need to effectively be managed, the characteristics of power-frequency communication of electric mode are to realize striding the long Distance Transmission of transformer platform area, because need not be at the high-tension line optional equipment, the system equipment cost is low, and do not have the communication service expense, if can adapt to the channel circumstance of industrial electrical network, be suitable as very much the data transmission channel of high power motor remote supervision system.
In industrial electrical network, as shown in Figure 1, connect the telecommunication terminal of main website equipment, oil pumping motor D and distribution transformer end at the ultra-high-tension power transmission line of electric substation.Downlink drive equipment in the main website equipment is before sending downlink data information, send first the synchronizing information based on the M sequential coding, communication terminal is when receiving signal, form composite signal according to modulating-coding, by the multiple wavelet transformation of short window Morlet composite signal is carried out energy parameter calculating and realize synchronous detection in conjunction with the characteristic of M sequential coding again, after synchronously detecting successfully, communication terminal just can carry out data demodulates; Because synchronizing information can be enhanced and need not decision threshold, because the restriction of field condition and operational management, it is very difficult in electric substation special frequency communication modulation transformer to be installed, and can only produce by the voltage that electric substation uses descending voltage distortion; Because used transfiguration quantitative limitation, a little less than the voltage distortion signal, the electrical network that the equipment such as while oil pumping motor produce disturbs very strong again, and the frequency communication mode that is applied to the domestic power grid resident is difficult to guarantee communication performance at industrial electrical network; Voltage distortion signal and electrical network that the frequency communication terminal is difficult to distinguish from electric substation disturb, and synchronously detection can't realize that data communication also just can't be carried out.
Summary of the invention
The purpose of this invention is to provide a kind of frequency communication synchronization detecting method and device for industrial electrical network, it is characterized in that the frequency communication sync detection device of described industrial electrical network is connected to by the telecommunication terminal of master station device and distribution transformer (pbyq) end on the ultra-high-tension power transmission line of electric substation and forms;
Described master station device is take industrial computer as core, and industrial computer connects the downstream signal drive unit by the RS485 interface, and the downstream signal drive unit is connected on the ultra-high-tension power transmission line by house transformer in the electric substation (syb); A/D converter in the industrial computer connects signal conditioning circuit, and signal conditioning circuit connects transmission line by voltage transformer pt summation current transformer CT;
Described downstream signal drive unit connects respectively the circuits for triggering of bidirectional triode thyristor (vs), positive and negative comparison circuit and Max485 by microprocessor; Bidirectional triode thyristor is connected with inductance L by protective circuit, and positive and negative comparison circuit connects signal conditioning circuit and consists of; Described downstream signal drive unit is connected to respectively the secondary of house transformer by voltage transformer pt by phase line options, signal conditioning circuit by inductance L;
Described telecommunication terminal is connected on the ultra-high-tension power transmission line by voltage transformer pt, distribution transformer.
Described telecommunication terminal has the 1-10 group to be connected in parallel on the ultra-high-tension power transmission line.
Described telecommunication terminal comprises by dsp processor, 16 A/D converters and signal conditioning circuit and forms central processing module, dsp processor connects the circuits for triggering of bidirectional triode thyristor, the drain electrode of bidirectional triode thyristor is by inductance L ground connection, and source electrode connects distribution transformer 380V end; The signal conditioning circuit of central processing module connects distribution transformer 380V end by the signal transducer module.
The frequency communication synchronization detecting method of described industrial electrical network specifically comprises:
1) master station device comprises uplink demodulation device and downstream signal drive unit take industrial computer as core; Carry out the power frequency communication system management by voltage transformer pt and industrial computer, when master station device need to obtain the data of telecommunication terminal, industrial computer passes through the RS485 interface to descending signal driver device sending controling instruction, the downstream signal drive unit produces modulated current by house transformer, then the leakage inductance by main piezoelectric transformer in the electric substation produces lower line distortion voltage, comprises departures synchronizing information and data; In the modulation of descending voltage distorted signal, adopt and carry out the modulation of synchronizing information based on false noise coding;
2) reception of downstream signal is finished by the frequency communication terminal of distribution transformer low-pressure side, because the frequency communication terminal is in passive accepting state, therefore at first to detect synchronously, judge whether to occur voltage modulation signal, reach synchronously the start cycle of data message, then just can carry out data demodulates, namely judge the start cycle of modulation intelligence, then the coding according to data message carries out data demodulates, the frequency communication terminal is carried out the signal compose operation at each voltage cycle, N voltage differential signal of adjacent periods produced composite signal by the M sequential coding consistent with transmitting terminal, then calculate the frequency domain energy parameter that meets descending voltage distorted signal feature in the composite signal, judge simultaneously the wherein direction of modulation signal; The frequency domain energy parameter is finished by the multiple small echo analysis of short window Morlet, and the direction of modulation signal is finished by cross-correlation method; When current power frequency period is consistent with synchronizing information start cycle, the frequency domain energy parameter maximum of composite signal and modulation direction are for just, because synchronizing information can be enhanced and need not decision threshold, when synchronous detect successfully after, judge that by the cross-correlation mode direction of modulation signal just can realize data demodulates.
Described each data message is by 1 distorted signal representative in 2 voltage cycles, and each synchronizing information is by N distorted signal representative in 2N the voltage cycle; In fact synchronously detection is exactly the start cycle that receiving terminal is judged each synchronizing information; When synchronous detect successfully after, receiving terminal just can be after synchronizing information finishes by judging that the modulation signal direction carry out data demodulates.
Described descending voltage side signal transmission represents command information to being from the electric substation to the terminal, realizes the expression of information with near the faint distortion of the voltage voltage over zero; The output of the low pressure of used change forms square wave behind voltage transformer pt and signal conditioning circuit, positive and negative comparison circuit, microprocessor in the downstream signal drive unit just can judge that by square wave voltage over zero constantly, thereby can modulate front 25 ° to 30 ° of voltage zero-cross, the less required used change power of modulation angle is just less, for convenient engineering installation, the employing driving element is fixed, and adapts to the different capabilities of the used change of industrial electrical network with the method for adjusting the modulation angle.
The invention has the beneficial effects as follows the characteristics according to industrial electrical network supply line, advance the synchronizing information modulation of frequency communication exit signal with the M sequential coding at the downstream signal drive unit of electric substation, the frequency communication terminal is passed through voltage sample, form composite signal according to coding, detect synchronously in conjunction with wavelet analysis and related operation, antijamming capability greatly too improves, even if also can successfully realize the synchronous detection of power frequency component under the weak condition of voltage distortion signal; When synchronous detect successfully after owing to can know the initial power frequency period of modulation signal, the data demodulates of frequency communication just can easily realize; Compare with traditional frequency communication mode, this method need not to arrange decision threshold when detecting synchronously, can adapt to various operating mode, although synchronizing information amount expense is larger than traditional frequency communication mode, but the heavy-duty motor quantity of every transformer-supplied is few in the industrial electrical network, the amount of information of required transmission can be accepted by production unit than the kilowatt meter reading-out system much less of domestic power grid.Power frequency communication system based on this scheme moves in the industrial electrical network field test, is applied to the motor remote monitoring, detects synchronously respond well.
Description of drawings
Fig. 1 is power frequency communication system sync detection device schematic diagram.
Fig. 2 is power frequency communication system device structure schematic diagram.
Fig. 3 is downlink drive device schematic diagram.
Fig. 4 is exit signal coding schematic diagram.
Fig. 5 is the telecommunication terminal structural representation.
Embodiment
The present invention is a kind of frequency communication synchronization detecting method and device for industrial electrical network.As shown in Figure 2, the frequency communication sync detection device is connected to by the telecommunication terminal of master station device and distribution transformer end on the ultra-high-tension power transmission line of electric substation and forms.Master station device is take industrial computer as core, and industrial computer connects the downstream signal drive unit by the RS485 interface, and the downstream signal drive unit is connected on the ultra-high-tension power transmission line by house transformer; A/D converter in the industrial computer connects signal conditioning circuit, and signal conditioning circuit connects transmission line by voltage transformer pt summation current transformer CT.Telecommunication terminal is connected on the ultra-high-tension power transmission line by voltage transformer pt, distribution transformer.There is 1-10 group telecommunication terminal in parallel at ultra-high-tension power transmission line.
The downlink drive device connects respectively the circuits for triggering of bidirectional triode thyristor, positive and negative comparison circuit and Max485 by microprocessor as shown in Figure 3; Controllable silicon is connected with inductance L by protective circuit, and positive and negative comparison circuit connects signal conditioning circuit and consists of; Described downlink drive device is connected to respectively the secondary of house transformer by voltage transformer pt by phase line options, signal conditioning circuit by inductance L.
The signal that transfers to the distribution transformer end from electric substation is exit signal, claims again downstream signal, realizes that by voltage distortion the signal that transfers to electric substation from distribution transformer is check-in signal, deserves to be called again capable signal, realizes by current distortion; Frequency communication adopts polling mode work, data message adopts frequently cycle coded modulation of multiplex (MUX), telecommunication terminal needs the start cycle of specified data information, so just can carry out data demodulates after must detecting successfully synchronously, and upstream data can be determined to detect zero-time synchronously in advance by agreement; The synchronous detection of exit signal is to judge in the electric network noise environment whether modulation signal exists, and its difficulty is much higher than data demodulates, is the key of frequency communication.
In downstream signal driving process, the coded system that microprocessor is fit to industrial electrical network drives downlink command formation control coding.
The frequency communication downstream signal is called again exit signal, and its coded system comprises synchronizing information and data two parts as shown in Figure 4; Data division adopts the Synchronization mode, per two power frequency periods carry a coded message, and the front and back by modulation positions represent, and synchronizing information adopts the modulation of carrying out based on pseudo noise M sequence, if the M sequence is bipolar code p (k), be characterized in: 1) sequence length N=2
r-1,2) periodicity 3) have sharp-pointed autocorrelation performance,
When synchronizing signal was modulated, each synchronizing information represented that by N sequence chip each chip represents with the front and back of two power-frequency voltage distorted signal positions in the cycle, and the modulation signal of each synchronizing information is expressed as:
Wherein, T is power frequency period, and v (t) is the voltage distortion signal, and p (k) is 7 twin-stage M sequence codes 1110100, and it has determined the distorted signal place cycle.
The reception of downstream signal is finished by the frequency communication terminal, at first will detect synchronously, the start cycle that judges whether voltage modulation signal to occur and reach synchronously data message, then just can carry out data demodulates.According to the design of this patent, each data message is by 1 distorted signal representative in 2 voltage cycles, and each synchronizing information is by N distorted signal representative in 2N the voltage cycle; In fact synchronously detection is exactly the start cycle that receiving terminal is judged each synchronizing information; When synchronous detect successfully after, receiving terminal just can be after synchronizing information finishes by judging that the modulation signal direction carry out data demodulates.
In order to realize synchronous detection, receiving terminal carries out the signal compose operation at each voltage cycle, N voltage differential signal of adjacent periods produced composite signal by the M sequential coding consistent with transmitting terminal, then calculate the frequency domain energy parameter that meets the distorted signal feature in the composite signal, judge simultaneously the wherein direction of modulation signal.
The relation that differs between the periodicity p of composite signal and current power frequency period and synchronizing information code element zero-time can be expressed as:
Wherein, β is the attenuation coefficient of distorted signal, and is relevant with load and the line impedance of electrical network, and existing modulation signal also has noise in the composite signal, and when Complete Synchronization, the modulation signal composition can access N enhancing doubly in the composite signal, and modulation direction is for just.
The frequency spectrum of frequency communication downstream signal at 200HZ between the 600HZ, because the odd harmonic interference is stronger in the industrial electrical network, this patent reflects the energy of voltage distortion signal in the composite signal by near the radio-frequency component effective value 208.3HZ, 312.5HZ, these 4 power frequency even-order harmonics of 416.6HZ, 500HZ.Because there is self-supply power plant in a lot of large enterprises, also has a large amount of mini gas power stations, mains frequency is stable not as public electric wire net, electrical network exists non-integer harmonics to disturb simultaneously, and this patent can obtain to specify in the composite signal effective value of radio-frequency component more accurately by the multiple small echo analysis of short window Morlet.
This patent designs every voltage cycle 200 points of sampling, and the multiple small echo real part of the Morlet of discretization and imaginary part are as follows:
Wherein, n is discrete series, k is the periodicity of this frequency in the calculated data window, b is adjustment factor, M is length 48 or 50 sampled points of data window, when k was respectively 1,1.5,2,2.5, corresponding frequency was 208.3HZ, 312.5HZ, 416.6HZ, 500HZ (M that this frequency adopts is 50 sampled points).Adjustment factor b has determined the inhibition situation to high fdrequency component, and the selection of b is relevant with the frequency of calculating, and when to 208.3HZ, 312.5HZ, 416.6HZ, when the 500HZ frequency is calculated, b is taken as respectively: 2.295,1.75,1.31,1.12.
Wavelet analysis belongs to linear transformation, and each frequency is calculated its effective value according to the multiple wavelet analysis of short window Morlet separately, and the effective value that assigned frequency is divided is:
Consider again normalization coefficient
, just can access the energy parameter that meets the distorted signal feature in the composite signal, be expressed as:
Because the roughly waveform of Corticofugal Modulation of Somatosensory signal is known in advance, and appears near the voltage zero-cross, therefore just can judge modulation signal direction in the composite signal by the cross-correlation parameter between reference signal v (t) and the composite signal s (t).
The cross-correlation parameters R
Sv(τ) be expressed as:
The positive and negative direction that reflects modulation signal of this parameter.
The attenuation coefficient β of energy parameter W and modulation signal, electric network noise and with current power frequency period and synchronizing information code initial time to differ periodicity p relevant, and the cross-correlation parameter is only relevant with p, terminal at same judgement transformer place, attenuation coefficient is the same, the composite noise power that a plurality of power frequency periods form is basic identical, the energy coefficient size of composite signal mainly determines by p, so energy maximum that decision threshold just can be by the searching composite signal and cross-correlation parameter need not be set for detecting just synchronously.
When synchronous detect successfully after owing to known the initial power frequency period of data encoding, the difficulty of data demodulates is much lower, judges the just realization of direction of modulation signal by the cross-correlation parameter of front and back periodic voltage differential signal and standard modulation signal.
With used change as frequency communication Corticofugal Modulation of Somatosensory transformer, a little less than the voltage modulation signal, and the industrial electrical network noise is again under the strong environment, the this patent designed system also can guarantee communication quality, owing to need not decision threshold be set such as traditional frequency communication mode when detecting synchronously, can adapt to the various operating modes in the industrial electrical network.
Being illustrated in figure 5 as telecommunication terminal comprises by dsp processor, 16 A/D converters and signal conditioning circuit and forms central processing module, dsp processor connects the circuits for triggering of bidirectional triode thyristor, the drain electrode of bidirectional triode thyristor is by inductance L ground connection, and source electrode connects distribution transformer 380V end; The signal conditioning circuit of central processing module connects distribution transformer 380V end by the signal transducer module.
The function of telecommunication terminal is that the demodulation of descending voltage distorted signal, communication protocol are processed, the ascending current modulation, and these functions all are to finish take the DSP calculation process as core; DSP gathers, processes voltage signal by 16 A/D and realizes the downlink data demodulation, its detect synchronously and data demodulation method as previously mentioned, wherein DSP selects TMS320LF2407,16 A/D selection ADS8364.Owing to need not just can realize detecting synchronously by decision threshold, even the row modulation is given birth in the used sell of one's property, distorted signal is faint and in the environment that the industrial electrical network noise is strong, the present invention also can guarantee communication performance, after data demodulates is finished, the processing of communication protocol is fairly simple, needs to adapt to the communication characteristics of heavy-duty motor remote monitoring.
Claims (3)
1. frequency communication synchronization detecting method that is used for industrial electrical network, the frequency communication sync detection device of industrial electrical network are connected to by the frequency communication terminal of master station device and distribution transformer end on the ultra-high-tension power transmission line of electric substation and form; Wherein, master station device is take industrial computer as core, and industrial computer connects the downstream signal drive unit by the RS485 interface, and the downstream signal drive unit is connected on the ultra-high-tension power transmission line by electric substation's transformer; A/D converter in the industrial computer connects signal conditioning circuit, and signal conditioning circuit is connected to transmission line by voltage transformer pt summation current transformer CT; The frequency communication terminal is connected on the ultra-high-tension power transmission line by voltage transformer pt, distribution transformer; It is characterized in that the frequency communication synchronization detecting method of described industrial electrical network specifically comprises:
1) master station device comprises uplink demodulation device and downstream signal drive unit take industrial computer as core; Carry out the power frequency communication system management by voltage transformer pt and industrial computer, when master station device need to obtain the data of frequency communication terminal, industrial computer passes through the RS485 interface to descending signal driver device sending controling instruction, the downstream signal drive unit produces modulated current by electric substation's transformer, then the leakage inductance by main transformer in substation produces descending voltage distorted signal, comprises departures synchronizing information and data; In the modulation of descending voltage distorted signal, adopt and carry out the modulation of synchronizing information based on false noise coding;
2) reception of downstream signal is finished by the frequency communication terminal of distribution transformer low-pressure side, because the frequency communication terminal is in passive accepting state, therefore at first to detect synchronously, judge whether to occur voltage modulation signal, reach synchronously the start cycle of data message, then just can carry out data demodulates, namely judge the start cycle of modulation intelligence, then the coding according to data message carries out data demodulates, the frequency communication terminal is carried out the signal compose operation at each voltage cycle, N voltage differential signal of adjacent periods produced composite signal by the M sequential coding consistent with transmitting terminal, then calculate the frequency domain energy parameter that meets descending voltage distorted signal feature in the composite signal, judge simultaneously the wherein direction of modulation signal; The frequency domain energy parameter is finished by the multiple small echo analysis of short window Morlet, and the direction of modulation signal is finished by cross-correlation method; When current power frequency period is consistent with synchronizing information start cycle, the frequency domain energy parameter maximum of composite signal and modulation direction are for just, because synchronizing information can be enhanced and need not decision threshold, when synchronous detect successfully after, judge that by the cross-correlation mode direction of modulation signal just can realize data demodulates.
2. described frequency communication synchronization detecting method for industrial electrical network according to claim 1, it is characterized in that, described each data message is by 1 distorted signal representative in 2 voltage cycles, and each synchronizing information is by N distorted signal representative in 2N the voltage cycle; In fact synchronously detection is exactly the start cycle that receiving terminal is judged each synchronizing information; When synchronous detect successfully after, receiving terminal just can be after synchronizing information finishes by judging that the modulation signal direction carry out data demodulates.
3. described frequency communication synchronization detecting method for industrial electrical network according to claim 1, it is characterized in that, the transmission direction of described descending voltage distorted signal is from electric substation to the frequency communication terminal, represents command information, realizes the expression of information with near the faint distortion of the voltage voltage over zero; The output of the low pressure of electric substation's transformer forms square wave behind voltage transformer pt and signal conditioning circuit, positive and negative comparison circuit, microprocessor in the downstream signal drive unit just can judge that by square wave voltage over zero constantly, thereby can modulate front 25 ° to 30 ° of voltage zero-cross, the less required electric substation of modulation angle transformer efficiency is just less, for convenient engineering installation, the employing driving element is fixed, and adapts to the different capabilities of industrial electrical network electric substation transformer with the method for adjusting the modulation angle.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102932294A (en) * | 2011-08-12 | 2013-02-13 | 中国石油天然气股份有限公司 | Power frequency communication system applied to oil field power grid |
| CN102706555B (en) * | 2012-01-05 | 2014-11-12 | 重庆大学 | Complex analytic optimal wavelet demodulation method |
| CN106160211B (en) * | 2015-03-30 | 2019-08-02 | 国家电网公司 | Rural power grids remote detecting system and method based on multichannel frequency communication technology |
| CN105098985B (en) * | 2015-08-21 | 2017-12-01 | 光一科技股份有限公司 | Method for becoming relational system based on power-frequency voltage Distortion recognition low-voltage distribution family |
| CN108768452B (en) * | 2018-05-30 | 2021-08-24 | 国网山东省电力公司经济技术研究院 | Detection method for bidirectional power frequency communication of power line |
| CN111487456B (en) | 2020-03-27 | 2021-11-16 | 威胜信息技术股份有限公司 | Method and system for extracting characteristic signal from power frequency signal and file management method |
| CN112019241B (en) * | 2020-10-22 | 2021-02-05 | 中国电力科学研究院有限公司 | Method and system for identifying equipment association relation in power system |
| CN113891448B (en) * | 2021-09-15 | 2024-02-27 | 国网福建省电力有限公司福州供电公司 | Ad hoc network communication method and terminal |
| CN114826330B (en) * | 2022-04-20 | 2023-09-22 | 青岛鼎信通讯股份有限公司 | Low-voltage station area characteristic current communication synchronization method based on m sequence |
| CN115589237B (en) * | 2022-12-13 | 2023-03-17 | 青岛鼎信通讯股份有限公司 | High-frequency current signal branch attribution judging method suitable for electric power field |
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| CN101251951A (en) * | 2008-04-03 | 2008-08-27 | 中国电力科学研究院 | Power distribution network industrial frequency communicating method and system |
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| CN201557110U (en) * | 2009-11-17 | 2010-08-18 | 中国电力科学研究院 | Industrial frequency communication multi-channel signal parallel transmission system |
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| CA2362103A1 (en) * | 1999-02-04 | 2000-08-10 | Electric Power Research Institute, Inc. | Apparatus and method for implementing digital communications on a power line |
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| CN101251951A (en) * | 2008-04-03 | 2008-08-27 | 中国电力科学研究院 | Power distribution network industrial frequency communicating method and system |
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| CN201557110U (en) * | 2009-11-17 | 2010-08-18 | 中国电力科学研究院 | Industrial frequency communication multi-channel signal parallel transmission system |
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