CN107493120B - An integrated device that integrates power line carrier communication and fault detection and location functions - Google Patents
An integrated device that integrates power line carrier communication and fault detection and location functionsDownload PDFInfo
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- CN107493120B CN107493120BCN201710780342.3ACN201710780342ACN107493120BCN 107493120 BCN107493120 BCN 107493120BCN 201710780342 ACN201710780342 ACN 201710780342ACN 107493120 BCN107493120 BCN 107493120B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
- H—ELECTRICITY
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- H04B3/00—Line transmission systems
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
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- H04L41/0677—Localisation of faults
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Abstract
Translated fromChinese
Description
Technical Field
The invention relates to an integrated device and method integrating power line carrier communication and fault detection and positioning functions, and belongs to the technical field of carrier communication.
Background
In aerospace and vehicle systems, multiple parts of the overall system need to be monitored and detected in order to ensure high reliability of operation of the system. Because the measurement parameters are hundreds of thousands, the number of required sensors and actuators is large, and a large number of data transmission lines are correspondingly required; meanwhile, the dependence degree on an engine control and carrying management system is continuously increased, the use of various passenger service and entertainment systems is increased, the problems of large quantity of cables, heavy weight and complex distribution in an aerospace and vehicle carrying system are inevitably caused, and the carrying efficiency is reduced. The method can greatly reduce the communication cost and avoid the construction difficulty of secondary wiring. Therefore, the method has been widely studied and applied in the fields of automobiles, airplanes, spacecraft and the like.
However, the application of the power carrier communication technology may reduce the reliability of the carrier system itself because it requires the coupling device, the carrier information transmitting end and the receiving end to be connected to the power line. And the working environment of aerospace and vehicle systems is complex, the power line is increasingly affected by humid air, chemical corrosion, high temperature, vibration, friction, overvoltage, overcurrent and other factors, the problems of easy aging and reduced insulating property occur along with the lengthening of the service cycle, the conductor layer of the power line is slowly endangered, the power line is subjected to faults of disconnection, grounding, short circuit and the like, and great hidden danger is buried for the normal work of the system. In case of a fault of a power line connected with an important component, not only data transmission of normal communication is affected, but also power transmission interruption is caused, chain reaction and fatal influence are caused to the whole power supply system, and further, serious life and property loss and even life threatening are caused. In addition, the movable space around the power line is narrow, so that the repair is difficult, the repair time is long, and the loss is easy to aggravate. There is an increasing demand for reliability and maintainability of wiring in carrier communication and aerospace and vehicle systems.
Among various methods related to fault detection and accurate positioning, the Spread Spectrum Time Domain Reflectometry (SSTDR) has high positioning accuracy and strong anti-interference capability, so that on-line detection can be realized, and the detection rate of the system can be greatly improved.
A method is described in U.S. pat NO 7,868,621B 2, Liu et al, of Honeywell corporation, where a power line carrier based aircraft power distribution system employs PLC technology and SSTDR fault diagnosis methods to provide critical maintenance functions. The method mainly contributes to the detection and positioning of the feeder line part before power-on unlike the traditional aircraft power distribution system, and the method can realize real-time online fault detection and positioning. The SSTDR fault detection device is added to a PLC modem, and SSTDR detection signals are injected into a power distribution system through a PLC tap point so as to realize online detection and positioning of power line faults of the airplane power distribution system.
However, the patent still has the following problems:
(1) when the SSTDR fault detection module is added to the PLC system, the size, the weight and the cost of the power distribution system fault detection device are increased;
(2) the SSTDR fault detection system injects detection signals into a power line through a PLC tap point, carrier communication signals and fault detection signals coexist in a channel, and two carrier signals have partial frequency spectrum overlapping, so that the respective signal-to-noise ratio is reduced, mutual interference is realized, and the carrier communication function and the fault detection function are synchronously influenced;
(3) when a power line between the PLC transmitting node and the PLC receiving node breaks down, the information transmission medium is damaged, and the fault information cannot be transmitted to the monitoring terminal through the PLC technology for timely fault analysis and processing.
Disclosure of Invention
According to the description in the background art, the SSTDDR fault detection module is added to the PLC system, and meanwhile, the size, the weight and the cost of the power distribution system fault detection device are increased; the injection of the SSTDR detection signal easily causes crosstalk between signals in a power line; when a power line between the PLC transmitting node and the PLC receiving node breaks down, the fault information cannot be transmitted to the monitoring terminal through the PLC technology. The invention aims to provide an integrated device integrating power line carrier communication and fault detection and positioning functions, aiming at the defects and shortcomings in the prior art. The device fuses power line carrier spread spectrum communication signals and fault detection signals under the condition that the size and the weight of a traditional power line carrier device and a fault detection device are not additionally increased, the functions of power line carrier communication and fault detection and positioning are realized by utilizing the fused signals, detected fault information is transmitted to a monitoring terminal by utilizing a wireless communication technology, and measures are conveniently taken to timely recover normal power transmission and communication signal transmission. The device reduces external hardware detection equipment, reduces the volume and the cost of the hardware device, and realizes the miniaturization, low cost and low power consumption design of the hardware device.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an integrate device fusing power line carrier communication and fault detection positioning function, the device comprising: the integrated device transmitting end and the integrated device receiving end;
the integrated device transmitting terminal comprises:
the transmitting terminal fault detection carrier signal generation and separation subsystem comprises: the method comprises the steps that an information source signal acquired by a transmitting end UART is input into a fault detection carrier signal generation module to generate an m sequence and a sine wave with special frequencies, the m sequence and the sine wave are respectively used as a fusion spread spectrum code and a fusion modulation code, the information source signal is subjected to periodic spread spectrum and modulation, a fusion signal of the information source signal and a fault detection signal is generated, the fusion signal can be used as a carrier signal to transmit information source information and can also be used as a fault detection signal, and the double functions of information transmission and power line fault detection positioning are achieved; the method comprises the steps that synchronous caching of data is achieved through an FIFO memory module, a fault detection signal is separated from a reflection signal returned by a fault point through a detection signal separation module, fault information is extracted through a fault information extraction module, and communication transmission is conducted through a transmitting terminal UART; after the fault information is obtained, the fault detection carrier signal generation module is used for coding the detected power line fault information to generate a fusion signal of an information source signal, a fault detection signal and the fault information, namely the fault detection carrier signal is used for carrying out power line carrier communication transmission;
transmitting end wireless communication module: when the power line fault occurs between the transmitting end and the receiving end, the fault information is transmitted to the transmitting end wireless communication module through the transmitting end UART, so that the wireless transmission of the power line fault information is realized, and the receiving end can find and process the fault in time;
integrate the device receiving terminal and include:
receiving end fault detection carrier signal receiving and separating subsystem: filtering a received fault detection carrier signal by using a filtering module, despreading the filtered signal by using a PN code generated by a fault carrier signal despreading module and a PN code generating module, realizing synchronization by using a synchronization module, demodulating and recovering by using a fault carrier signal demodulation module to obtain an information source and fault information fusion signal, further separating the information source signal from fault information by using different sampling frequencies through a frequency division sampling separation module, and performing binary decoding on the fault information through a decoding module to obtain power line fault information; the fault information and the information source information are communicated with the upper computer through a receiving end UART (universal asynchronous receiver/transmitter), or are communicated with the upper computer through a receiving end wireless communication module;
a receiving end wireless communication module: and communication between the wireless communication module and the upper computer and the transmitting terminal is realized.
Preferably, the integrated device transmitting terminal further comprises:
a transmitting end DA module: D/A conversion is carried out on the fault detection carrier signal;
transmitting end AD module: carrying out analog-to-digital conversion on the carrier signal containing the fault information reflected by the power line;
transmitting end conditioning circuit: one is connected to the output end of the DA module of the transmitting end, and the other is connected to the input end of the AD module of the transmitting end, so as to realize the conditioning of the signal;
transmitting end isolation coupler: the power line circuit is connected with the power line and used for realizing the electrical isolation of the integrated device and the power line circuit, coupling the carrier signal with the fault detection capability to the power line to be detected and coupling the reflected carrier signal with the fault information to the transmitting end;
a sensor sampling module: collecting an information source signal;
the transmitting end power supply management module: the required voltage is provided for the whole transmitting end system.
Preferably, the integrated device receiving end further includes:
a receiving end AD module: collecting fault detection carrier signals to perform analog-to-digital conversion;
a receiving end conditioning circuit: the signal conditioning module is connected to the input end of the receiving end AD module to realize the conditioning of the signal;
receiving end isolation coupler: the integrated device is connected with the power line, is used for realizing the electrical isolation of the integrated device and the power line loop, and couples the acquired carrier signal to a receiving end;
a receiving end power supply management module: the required voltage is provided for the whole receiving end.
In the fusion method of the power line carrier spread spectrum communication signal and the SSTDR fault detection signal, fusion is firstly embodied as generation of a detection carrier fusion signal, and an information source signal and the detection signal are fused, so that the power line fault detection function is realized, and simultaneously, carrier information transmission is carried out. And secondly, generating a fault detection carrier signal, extracting fault information from the detection carrier fusion signal, transmitting the fault information to an integrated receiving end, and taking processing measures in time, so that the fault information, the information source information and the fault detection signal are fused into the fault detection carrier signal, and the signal can further integrate the function of power line fault information transmission on the basis of the fusion of the two functions.
A method for fusing a power line carrier communication signal and an SSTDR fault detection signal comprises the following specific steps:
step 1: firstly, a binary sequence S of fault detection signals is carried out2And source signal binary sequence S1Fusing: binary sequence S of source signal1Has a frequency of f1Performing periodic spread spectrum processing on the binary sequence S of the fault detection signal by using a spread spectrum code2Said fault detection signal binary sequence S2Is an n-th order m sequence, n is more than or equal to 5, and the frequency is f2The number of m-sequence bits is 2n-1, fullThe symbol bit length of the sufficient source signal is a times the length of the m-sequence period, i.e.
Step 2: modulating the periodic spread spectrum signal obtained in thestep 1, wherein the BPSK is selected as a modulation mode, and the frequency of the modulated sine wave is f2Obtaining a detection carrier modulation signal with the same frequency as the m-sequence code chip in thestep 1; the detection carrier modulation signal has the power line carrier communication function and the power line fault detection and positioning capacity, is used as a fusion signal of an information source signal and a fault detection signal, is subjected to digital-to-analog conversion and signal conditioning, and is coupled into a power line for information transmission and fault diagnosis;
and step 3: fusing the fault information obtained by diagnosis with the information source signal so as to transmit the fault information to the processing terminal, and carrying out binary coding on the fault information to form a binary sequence S3Sequence length of l3Frequency of f3；
And 4, step 4: binary sequence S of fault information3And source signal binary sequence S1Performing a multiplication operation S3And S1The chip bit length of (1) being kept integer times, i.e.
Obtaining a fusion signal of the fault information and the information source signal with the frequency f3；
And 5: carrying out periodic spread spectrum processing on the fusion signal of the fault information and the information source signal obtained in the step (4) to meet the condition that the code element bit length of the fusion signal of the fault information and the information source signal is equal to the m sequence, namely
Step 6: modulating the periodic spread spectrum signal obtained in thestep 5, wherein the BPSK is selected as a modulation mode, and the frequency of the modulated sine wave is f2The frequency of the m-sequence chip is the same as that of the m-sequence chip in thestep 5, and a fault detection carrier signal is obtainedNumber; the signal further improves the integration level on the basis of detecting the carrier modulation signal, is fused with fault information, and has the capabilities of fault detection and positioning, information source information transmission and fault information transmission.
The binary source signal has a frequency lower than that of the spread spectrum code, that is, within the bit length time of the source signal, the spread spectrum code corresponds to an integral multiple of the sequence period, after the periodic spread spectrum operation, the spread spectrum signal does not change the arrangement of the spread spectrum code within the sequence period, that is, the spread spectrum signal still has autocorrelation and cross correlation within the spread spectrum code period, that is, a detection carrier modulation signal with carrier communication characteristics and fault detection positioning characteristics is generated. The detection carrier modulation signal is used as an incident signal, when the signal is transmitted to a fault point, the signal is reflected due to impedance mismatch, and the corresponding reflection detection carrier modulation signal obtained from the power line also has the characteristics of carrying carrier information and fault detection positioning. Because the m-sequence has excellent autocorrelation and cross-correlation, the m-sequence is selected as a fusion spread spectrum code, fault information is extracted by separating a detected carrier modulation signal and sampling correlation operation waveforms of an incident detected carrier modulation signal and a reflected detected carrier modulation signal, and the type (short circuit, open circuit, intermittent fault and the like) and the position of a power line fault are determined.
And after the fault information is extracted, multiplying the information source signal by the fault information obtained by detection to generate a fault information and information source signal fusion signal. And then, in the same way, carrying out periodic spread spectrum processing and carrier modulation on the fusion signal of the fault information and the information source signal to finally obtain a fault detection carrier signal, and realizing the fusion of the fault information, the information source information and the fault detection signal.
The integrated device integrating the power line carrier communication and fault detection positioning functions can encode the processed power line fault information to generate an information source signal, a detection signal and a fusion signal of the fault information. When the power line trouble takes place outside integrating device transmitting terminal and receiving terminal, can carry out the transmission of fault detection carrier signal through integrating the device through the power line to in time with information source signal and fault information transmission to integrating the device receiving terminal, in time handle the power line trouble.
The integrated device integrating the power line carrier communication and the fault detection positioning function has the advantages that the transmitting end fault detection carrier signal generation and separation subsystem can communicate with the wireless communication module, and the transmitting end fault detection carrier signal generation and the fault information inside the separation subsystem can be transmitted to the receiving end through the wireless communication module when the power line fault occurs between the transmitting end of the integrated device and the receiving end of the integrated device, so that the normal work of the communication function and the timely processing of the fault information are guaranteed.
Fuse power line carrier communication and fault detection locate function's device that integrates, its receiving terminal wireless communication module can communicate with the host computer between, when the power line trouble takes place integrating the device transmitting terminal and integrating between the device receiving terminal, the host computer can not acquire information source signal and fault information through the wire communication transmission, then through receiving terminal wireless communication module, give transmitting terminal wireless communication module in order to instruct, guide its transmission power line fault information, receiving terminal wireless communication module received information and upload to the host computer, so that in time handle.
The invention has the beneficial effects that:
1. the signal fusion method is utilized to realize the organic fusion of the carrier communication signal and the fault detection signal, so that the power carrier communication signal has the characteristics of the fault detection signal, and the information source signal, the detection signal and the fault information are fused into one fault detection carrier signal. The method avoids the problem that in the traditional method, in order to realize the fault diagnosis function of the carrier communication power line, the fault detection signal and the carrier communication signal are simultaneously injected into the power line to be detected, and the interference caused by the frequency spectrum overlapping between the two signals is eliminated.
2. The device organically combines the power line carrier communication function with the power line fault detection positioning function, and compared with the traditional fault diagnosis device and the power line carrier communication device, the device realizes the carrier communication function and the fault detection positioning function of the power line simultaneously by utilizing the fusion signal under the condition of not increasing the volume, the weight and the cost of the device, and performs self-diagnosis on the carrier communication device. The design of miniaturization, low cost and low power consumption of the hardware device is realized, the reliability and maintainability of the power transmission and communication system can be effectively improved, and the market popularization is facilitated.
3. The occurrence position of the fault on the carrier power line is comprehensively considered, and when the fault occurs on the power line between the transmitting end and the receiving end of the integrated device, the wired transmission function of the integrated system cannot work normally. The wireless communication module in the integrated device is used for transmitting fault information, good communication between the fault information and an upper computer is guaranteed, the fault is timely analyzed and processed at the information receiving terminal, targeted measures are convenient to take timely, guarantee is provided for power transmission, and organic integration of power transmission, information transmission and fault diagnosis is achieved.
The technical scheme of the invention can be widely applied to low-voltage and high-voltage power systems of airplanes, ships and electric vehicles.
Drawings
FIG. 1 is a schematic diagram of the overall architecture of the integrated device of the present invention;
FIG. 2 is a block diagram of a fault detection carrier signal generation module;
fig. 3 is a schematic diagram of a signal fusion method of a power line carrier spread spectrum communication signal and an SSTDR fault detection signal;
fig. 4 is a power line fault information curve obtained by detecting a signal separation result;
FIG. 5 is a signal source data transmission waveform of the transmitting end and the receiving end of the integrated device;
Detailed Description
Some of the key technologies related to the present invention will be described in detail below with reference to the accompanying drawings to support the claims.
Fig. 1 is a schematic view of an integrated device overall architecture integrating power line carrier communication and fault detection and location functions. In the integrateddevice transmitting terminal 1, the information source signal acquired by the signal collector 9 is input into the transmitting terminal fault detection carrier signal generation andseparation subsystem 3 through the transmitting terminal UART23, and the fault detection carriersignal generation module 19 generates a pseudo-random sequence and a sine wave with periodic characteristics, which are respectively used as a fusion spread spectrum code and a fusion modulation code. The signal source signal is subjected to periodic spread spectrum and modulation to generate a detection carrier modulation signal which can be used as a carrier signal for transmitting information and a power line fault detection signal and has double functions of information transmission and power line fault detection and positioning; the transmitting end DA module 4 is connected between the transmitting end fault detection carrier signal generating and separating subsystem 3 and the transmitting end conditioning circuit 6 and is used for carrying out digital-to-analog conversion on the carrier communication and fault detection fusion signal generated by the fault detection carrier signal generating and separating subsystem; a transmitting end conditioning circuit 6 is respectively connected between the transmitting end DA module 4 and the transmitting end isolating coupler 7, and between the transmitting end AD module 5 and the transmitting end isolating coupler 7, and is used for conditioning the signal amplitude; the transmitting terminal isolation coupler 7 is connected with a power line and used for realizing strong and weak current isolation of the integrated device and a power line loop, coupling a carrier communication and fault detection fusion signal to the power line to be detected and coupling a reflected carrier signal with fault information to a transmitting terminal; the transmitting end AD module 5 is connected between the transmitting end conditioning circuit 6 and the transmitting end fault detection carrier signal generating and separating subsystem 3 and is used for carrying out analog-to-digital conversion on the carrier signal containing fault information reflected by the power line; the synchronous buffer of data (by using the FIFO module 20), the fusion signal separation processing (by using the detection signal separation module 21), and the fault information extraction (by using the fault information extraction module 22) are realized in the transmitting end fault detection carrier signal generation and separation subsystem 3, and communication is performed between the transmitting end serial port communication UART23 and the transmitting end wireless communication module 8. At this time, the fault information needs to be transmitted to the fault monitoring terminal, i.e. the integrateddevice receiving end 2, so as to analyze and process the fault. When a power line fault occurs outside the transmitting end and the receiving end of the integrated device, the integrated device can be used for carrying out wired transmission of fault information, so that the fault information is input into the fault detection carriersignal generation module 19, the fault information, information source information and detection signal fusion signals are further fused, a fault detection carrier signal is generated, and data transmission is realized.
In the integrateddevice receiving terminal 2, the failure detection carrier signal is transmitted to the device integrated receivingterminal 2 through the power line. The receiving end isolation coupler 14 is connected between the power line and the receiving end conditioning circuit 13, is connected with the power line, and is used for realizing the electrical isolation between the integrated device and the power line loop and coupling the collected fusion carrier signal to the receiving end; the receiving end conditioning circuit 13 is connected between the receiving end isolation coupler 14 and the receiving end AD module 12, and is configured to condition the amplitude of the signal; the receiving end AD module 12 is connected between the receiving end conditioning circuit 13 and the receiving end fault detection carrier signal receiving and separating subsystem 11, and is configured to perform analog-to-digital conversion on the fault detection carrier signal; the receiving-end failure detection carrier signal receiving and separating subsystem 11 is configured to filter (using the filtering module 24) the received failure detection carrier signal, despread (using the failure carrier signal despreading module 26) the failure carrier signal, synchronize (using the synchronizing module 25), generate a PN code (using the PN code generating module 32), demodulate the failure carrier signal (using the failure carrier signal demodulating module 27), perform frequency division sampling separation (using the frequency division sampling separating module 33), decode (using the decoding module 28), recover the source signal, and obtain power line failure information. Through receiving terminal serial port communication UART29 with the host computer communicates, or through carrying out communication between receiving terminal wireless communication module 15 and the host computer, realize the transmission of fault information, be convenient for in time take measures.
At integratingdevice transmitting terminal 1 and integratingdevice receiving terminal 2, have transmitting terminalwireless communication chip 8 and receiving terminal wireless communication chip 15 respectively and link to each other with the host computer, its effect is when the fault point is integratingdevice transmitting terminal 1 and integrating betweendevice receiving terminal 2, and transmission medium is destroyed, integrates the wired communication transmission that the device can't realize fault information. At this moment, the upper computer cannot acquire the information source signal and the fault information, the receiving end wireless communication chip 15 gives an indication to the transmitting endwireless communication chip 8 to guide the transmitting end wireless communication chip to transmit the power line fault information, and the receiving end wireless communication chip 15 receives the information and uploads the information to the upper computer so as to be processed in time.
In the figure, the transmitterpower management module 10 provides the required voltage for the whole transmitter system, and the receiverpower management module 17 provides the required voltage for the whole receiver system.
Fig. 2 is a schematic structural diagram of a fault detection carriersignal generation module 19, which includes anencoding module 18, a periodicspectrum spreading module 30, a detectionsignal generation module 32, and a fusioncarrier modulation module 31, and adopts a signal fusion method of a power line carrier spread spectrum communication signal and an SSTDR fault detection signal to fuse the acquired information source signal, detection signal, and fault information, so that the power line carrier communication signal can be used as a fault detection signal while transmitting information, to detect and locate a fault on a power line, and to transmit the obtained fault information to an integrated receiving end.
In the fusion method of the power line carrier spread spectrum communication signal and the SSTDR fault detection signal, fusion is firstly embodied as generation of a detection carrier fusion signal, so that the power line fault detection function is realized, and simultaneously, carrier information is transmitted. Secondly, generating a fault detection carrier signal, extracting fault information from the detection carrier fusion signal, transmitting the fault information to an integrated receiving end, taking processing measures in time, and fusing the fault information, information source information and a detection signal into a fault detection carrier signal, wherein the signal can further fuse the function of power line fault information transmission on the basis of the fusion of the two functions.
Fig. 3 is a schematic diagram of a signal fusion method of a power line carrier spread spectrum communication signal and an SSTDR fault detection signal, which includes the following specific implementation steps:
step 1: firstly, a binary sequence S of the detection signal is carried out2And source signal binary sequence S1The fusion of (1). Binary sequence S of source signal1Has a frequency of f1Performing periodic spread spectrum processing on the received signal, wherein the fused spread spectrum code selects an n-order m sequence n not less than 5 and has a frequency f2The number of m-sequence bits is 2n-1, satisfying that the source signal symbol bit length is a times the m-sequence period long, i.e.
a≥5；
Step 2: modulating the periodic spread spectrum signal obtained in thestep 1, wherein the BPSK is selected as a modulation mode, and the frequency of the modulated sine wave is f2Obtaining a detection carrier modulation signal with the same frequency as the m-sequence code chip in thestep 2; the detection carrier modulation signal has the power line carrier communication function and the power line fault detection and positioning capacity, is used as an information source and detection fusion signal, and is subjected to digital-to-analog conversion and signal conditioning and coupled into a power line to perform information transmission and fault diagnosis;
and step 3: fusing the fault information obtained by diagnosis with the information source signal so as to transmit the fault information to the processing terminal, and carrying out binary coding on the fault information to form a binary sequence S3Sequence length of l3Frequency of f3；
And 4, step 4: binary sequence S of fault information3And source signal binary sequence S1Performing a multiplication operation S3And S1The chip bit length of (1) being kept integer times, i.e.
Obtaining a fusion signal of fault information and information source information with the frequency of f3；
And 5: carrying out periodic spread spectrum processing on the fault information and information source information fusion signal obtained in the step (4) to meet the condition that the code element bit length of the fault information and information source information fusion signal is equal to the m sequence, namely
Step 6: modulating the periodic spread spectrum signal obtained in thestep 5, wherein the BPSK is selected as a modulation mode, and the frequency of the modulated sine wave is f2Obtaining a fault detection carrier signal with the same frequency as the m-sequence code chip in thestep 5; the signal further improves the integration level on the basis of detecting the carrier modulation signal, is fused with fault information, and has the capabilities of fault detection and positioning, information source information transmission and fault information transmission.
The binary source signal has a lower frequency than the fused spreading code, that is, within the bit length time of the source signal, the fused spreading code corresponds to an integral multiple of the sequence period, after the periodic spreading operation, the spread signal does not change the arrangement of the fused spreading code within the sequence period, that is, the spread signal still has autocorrelation and cross-correlation within the spread code sequence period, that is, a detected carrier modulation signal with carrier communication characteristics and fault detection positioning characteristics is generated. The detection carrier modulation signal is used as an incident signal, when the signal is transmitted to a fault point, the signal is reflected due to impedance mismatch, and the corresponding reflection detection carrier signal obtained from the power line also has the characteristics of carrying carrier information and fault detection positioning. Because the m-sequence has excellent autocorrelation and cross-correlation, the m-sequence is selected as a fusion spread spectrum code, the detection carrier signal is separated, and the correlation operation waveform of the incident detection carrier signal and the reflection detection carrier signal is sampled to extract fault information, so that the type (short circuit, open circuit, intermittent fault and the like) and the position of the power line fault are determined.
And after the fault information is extracted, multiplying the information source signal by the fault information obtained by detection to generate a fault information and information source information fusion signal. And then, in the same way, carrying out periodic spread spectrum processing and carrier modulation on the fusion signal of the fault information and the information source information to finally obtain a fault detection carrier signal, and realizing the fusion of the fault information, the information source information and the fault detection signal.
The device organically fuses the fault detection signal and the carrier communication spread spectrum modulation signal, utilizes the fault detection carrier signal to detect and position the power line fault while transmitting carrier information, reduces external hardware detection equipment, reduces the cost of a hardware device, selects an FPGA series chip, a DAC (digital-to-analog converter) chip and an ADC (analog-to-digital converter) chip with low power consumption, low cost and high performance, and realizes the miniaturization, low cost and low power consumption design of the hardware device.
Fig. 4 shows a power line fault information curve obtained by integrating the functions of power line carrier communication and fault detection and location, wherein an open-circuit fault is set at 4.1m of an AF250 teflon power line, the center frequency of an incident signal of an SSTDR is set to 10MHz, and the results of signal separation and fault information extraction are detected in the integrated device. As can be seen from the figure, the distance between the two wave head peaks along the x-axis direction can accurately reflect the fault distance, and the polarity of the primary reflection wave head can accurately reflect the fault type (open circuit or short circuit).
Fig. 5 is a schematic diagram of transmission waveforms of a transmitting end and a receiving end of an integrated device integrating power line carrier communication and fault detection and location functions when a carrier communication system is in normal operation. As can be seen from the figure, the signals can be accurately transmitted.
In summary, although the basic structure, principle and method of the present invention have been specifically described by the above embodiments, it will be apparent to those skilled in the art that modifications/substitutions and combinations can be made without inventive effort without departing from the spirit of the present invention.
Claims (7)
Translated fromChinese
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| US10601213B2 (en)* | 2018-05-22 | 2020-03-24 | Schneider Electric USA, Inc. | Arc fault detection using frequency hopping techniques |
| CN111555776B (en)* | 2020-04-28 | 2022-06-03 | 国电南瑞科技股份有限公司 | A transmission line fusion perception and joint diagnosis method, system and device |
| CN112367098B (en)* | 2020-11-10 | 2021-10-26 | 南京航空航天大学 | Method for realizing fault diagnosis through spread spectrum carrier |
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