CN114115033A - Pulse emission control method and control system - Google Patents
Pulse emission control method and control system Download PDFInfo
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- CN114115033A CN114115033A CN202111411374.9A CN202111411374A CN114115033A CN 114115033 A CN114115033 A CN 114115033A CN 202111411374 A CN202111411374 A CN 202111411374A CN 114115033 A CN114115033 A CN 114115033A
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
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- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract
The invention discloses a pulse emission control method and a control system, wherein the control system comprises: the controller is used for sending an incident wave sending instruction command to the signal generator and receiving a feedback instruction, sending an acquisition instruction command to the collector and receiving the feedback instruction, and analyzing data of the received feedback instruction; and the signal generator is used for receiving the incident wave sending instruction command, configuring a hardware module of the signal generator according to the configuration content in the incident wave sending instruction command, and sending the incident wave according to the configuration content. The method can accurately measure the time difference between the incident wave and the reflected wave by controlling the time width and the amplitude of the incident wave, thereby obtaining an accurate cable length value, further determining the position of a power cable fault point, reducing the power failure time, improving the power supply reliability, and reducing the fault repair cost and the loss caused by power failure.
Description
Technical Field
The invention relates to the field of automatic control, in particular to a pulse emission control method and a pulse emission control system.
Background
With the rapid development of national economy in China, power cables are more and more widely applied to urban power distribution networks. Compared with an overhead line, the power cable has the advantages of high power supply reliability, no influence of ground and space buildings, no damage by severe weather and birds, safety, concealment, durability, small maintenance workload, moisture resistance, corrosion resistance, damage resistance and the like. In dense population areas, large factories, power plants, traffic congestion areas, power grid intersection areas and other places in urban districts, the occupied area of power supply is small, and generally cables are mostly adopted for power supply.
With the increasing number of cable applications and the increasing running time and load, the failure of power cables is more and more frequent. Because most of cable lines are laid in cable trenches or buried underground, once a fault occurs, finding the fault position of the cable is very difficult, hours or even days are often spent, and even the whole cable is scrapped. Not only wastes a large amount of manpower and material resources, but also causes the power failure loss which is difficult to measure. Therefore, the fault point of the power cable is determined quickly and accurately, the power failure time can be reduced, the power supply reliability is improved, and the fault repair cost and the loss caused by power failure are reduced. After a cable breaks down, a fault point can not be directly found through an intuitive method, and the fault property and the specific fault distance can be judged only by adopting a special instrument for testing. At present, various practical distance measurement methods have appeared, wherein the traveling wave method theory is used most widely, and the traveling wave method theory can be used for more accurately measuring the distance of the cable fault, thereby reducing the workload of fault accurate positioning, being beneficial to quickly finding fault points and removing faults, recovering the operation of a power system in time and reducing the economic loss caused by the cable fault.
The traveling wave method can not only play a role in the distance measurement of cable faults, but also be applied to occasions where the actual length of the cable needs to be accurately measured, particularly occasions where the cable is long and cannot be unfolded for measurement. For example: cable distance measurement in the delivery quality detection of cable manufacturing plant products, cable distance measurement in the delivery detection of cable products by building supervision units, and the like.
In a travelling wave methodIn theoretical practice, the time difference between the incident wave and the reflected wave is measured (unit: mus microsecond, 1 mus 10)-6Seconds) is a key technology in cable ranging technology, as shown in fig. 1. In order to accurately measure the time difference between the incident wave and the reflected wave, the time width (unit: mus microsecond) and the amplitude (unit: V volt) of the incident wave need to be accurately controlled.
On the premise that the amplitude of the incident wave is constant, the larger the time width of the incident wave is, the larger the waveform envelope of the caused reflected wave (i.e. the time width of the reflected wave and the amplitude of the reflected wave) is, and the easier the reflected wave is to be measured and observed; however, the larger the time width of the incident wave, the waveform aliasing between the incident wave and the reflected wave will be caused, that is, the waveforms of the incident wave and the reflected wave are overlapped together, which results in that the time difference between the incident wave and the reflected wave cannot be measured, and the cable ranging fails. On the premise that the amplitude of the incident wave is constant, the smaller the time width of the incident wave is, the smaller the waveform envelope of the caused reflected wave is, the more difficult the measurement and observation of the reflected wave are, and even the cable fails to measure the distance due to the fact that the cable has inherent attenuation to the incident wave and no reflected wave is actually formed.
The meaning of the waveform aliasing is that an incident wave has a certain width in a time domain, the incident wave forms a reflected wave after being transmitted by a cable, and the reflected wave also has a certain width in the time domain; with both of the respective widths, aliasing is produced if temporal overlap occurs in the time domain. This aliasing directly results in a failure to measure the time difference between the incident and reflected waves and is therefore to be avoided.
Therefore, in the cable ranging system, the precise control of the time width and amplitude of the incident wave becomes a technical problem to be solved.
Disclosure of Invention
The invention aims to provide a pulse emission control method and a pulse emission control system for controlling the time width and the amplitude of incident waves, so that the time difference between the incident waves and the reflected waves can be accurately measured, an accurate cable length value can be obtained, the position of a fault point of a power cable can be further determined, the power failure time can be reduced, the power supply reliability can be improved, and the fault repair cost and the loss caused by power failure can be reduced.
In order to achieve the purpose, the invention provides the following technical scheme:
a pulse transmission control method comprising the steps of:
step 1, a controller sends an incident wave sending instruction command to a signal generator;
step 2, after receiving the 'incident wave sending indication' instruction, the signal generator configures a hardware module of the signal generator according to the configuration content in the 'incident wave sending indication' instruction, and sends the incident wave according to the configuration content;
step 3, the signal generator sends an 'answer' instruction to the controller, and if the 'answer' instruction comprises a 'success' instruction, the controller continues to carry out the step 4; if the 'answer' instruction contains 'failure' indication, the controller repeats the operation of the step 1 or finishes the whole process;
step 4, the controller sends an acquisition instruction command to the acquisition device;
step 5, the collector feeds back and sends an 'answer' instruction to the controller, and if the instruction comprises a 'success' instruction which indicates that the acquisition instruction configuration of the collector by the controller is realized, the controller continues to carry out step 6; if the instruction contains a 'failure' indication, the controller repeats the operation of the step 4 or finishes the whole process;
step 6, the collector configures a hardware module of the collector according to the configuration content in the instruction of collecting indication in the step 4, and performs signal collection and signal processing according to the configuration content;
step 7, the collector sends a waveform data transmission instruction to the controller module; the instructions include: acquiring the waveform data of the incident wave and the reflected wave and/or the serial number of the acquisition unit according to the instruction of acquiring indication in the step 4;
step 8, the controller sends a 'response' instruction to the collector; the instructions contain one or more of the following parameters: collector number, success or failure indication;
after the controller receives the waveform data transmission command, if the command contains the collector number, the controller checks whether the number is consistent with the number of the collector sent in the collection instruction in the step 4, if so, the controller stores the waveform data and continues to perform the step 9;
the collector receives the 'answer' instruction, if the 'answer' instruction contains the collector number, the collector checks whether the number is consistent with the self number, and if so, the step 9 is continued;
if the command comprises a success indication, the controller is indicated to correctly process the waveform data transmission command in the step 7, and the acquisition step of the acquisition device is finished; if the instruction contains a 'failure' instruction, the collector repeats the operation of the step 7 or finishes the whole process;
step 9, the controller judges whether the incident wave sending parameters need to be adjusted according to the data of the incident waves and the reflected waves acquired in the step 7; if the controller judges that the incident wave sending parameters need to be adjusted, the controller returns to the step 1 to carry out control and command sending; and if the incident wave sending parameters do not need to be adjusted, ending the whole process.
As a further aspect of the present invention, the "incident wave sending instruction" instruction at least includes one or more of the following parameters: the method comprises the steps of incident wave time width, incident wave amplitude, incident wave sending frequency, incident wave polarity and signal generator number.
As a further aspect of the present invention, the configuration content of the hardware module of the signal generator in step 2 includes one or more of the following parameters: the method comprises the steps of incident wave time width, incident wave amplitude, incident wave sending frequency, incident wave duty ratio and incident wave polarity.
As a further aspect of the present invention, the "acquisition indication" instruction at least comprises one or more of the following parameters: the sampling device comprises a collector number, a sampling frequency, a sampling amplitude range, a sampling time length, a quantization bit number of each sampling point and a filtering mode.
As a further scheme of the present invention, the configuration content of the hardware module of the collector in step 6 includes one or more of the following parameters: sampling frequency, sampling amplitude range, sampling time length, quantization digit of each sampling point, total sampling point number and filtering mode.
As a further scheme of the present invention, the specific method for determining whether the incident wave transmission parameter needs to be adjusted by the controller in step 9 includes the following steps:
d. the controller judges whether the incident wave and the reflected wave are subjected to aliasing or not according to the data of the incident wave and the reflected wave acquired in the step 7, if the waveform aliasing phenomenon occurs, the controller reduces the sending time width of the incident wave, and the control flow is ended; if the waveform aliasing phenomenon does not occur, the controller performs the next control judgment;
e. the controller calculates the maximum value of the reflected wave amplitude according to the data of the incident wave and the reflected wave acquired in the step 7, and judges whether the maximum value is larger than a preset threshold value or not, if the maximum value of the reflected wave amplitude is smaller than the threshold value, the controller increases the amplitude of the incident wave or increases the time width of the incident wave, the control flow is finished, and if the maximum value of the reflected wave amplitude is larger than the preset threshold value, the controller performs the next control judgment;
f. the controller calculates the area of the envelope of the reflected wave and the time axis according to the data of the incident wave and the reflected wave acquired in the step 7, and judges whether the area is larger than a preset threshold value or not; if the area is smaller than the threshold value, the controller increases the amplitude of the incident wave or increases the time width of the incident wave, the control flow is ended, otherwise, the control flow is directly ended.
As a further aspect of the present invention, the reduction of the incident wave transmission time width is determined by aliasing, and the more aliasing, the larger the reduction amount is, and vice versa.
As a further aspect of the present invention, the calculation of the maximum value of the reflected wave amplitude means obtaining the maximum value of the reflected wave amplitude by a size comparison method.
As a further aspect of the present invention, the preset threshold is a fixed value or a fixed value multiplied by a maximum value of an incident wave amplitude or a fixed value multiplied by an average value of the incident wave amplitude or a fixed value multiplied by a range of a sampling amplitude in the "acquisition instruction" command of step 4.
Furthermore, the present invention provides a pulse emission control system using the above method, wherein the control system specifically includes:
the controller is used for sending an incident wave sending instruction command to the signal generator and receiving a feedback instruction, sending an acquisition instruction command to the collector and receiving the feedback instruction, and analyzing data of the received feedback instruction;
the signal generator is used for receiving the incident wave sending indication command, configuring a hardware module of the signal generator according to the configuration content in the incident wave sending indication command, sending the incident wave according to the configuration content, and feeding back the sending result to the controller through the response command;
and the collector is used for receiving the acquisition instruction, configuring a hardware module of the collector, carrying out signal acquisition and signal processing according to the configuration content and sending a feedback instruction to the controller.
Compared with the prior art, the invention has the beneficial effects that: the system and the control method thereof can accurately measure the time difference between the incident wave and the reflected wave by controlling the time width and the amplitude of the incident wave, thereby obtaining an accurate cable length value, further determining the position of a power cable fault point, reducing the power failure time, improving the power supply reliability, and reducing the fault repair cost and the loss caused by power failure.
Drawings
FIG. 1 is a graph of the time difference between an incident wave and a reflected wave in the prior art;
FIG. 2 is a flow chart of a control method of the present invention;
FIG. 3 is a flow chart illustrating the specific analysis and control of the controller according to the present invention.
Detailed Description
The technical scheme of the patent is further described in detail by combining the following specific embodiments:
the invention relates to a pulse emission control system, which comprises the following control modules:
the controller is used as a core control device and has the functions of independently calculating according to a preset algorithm and carrying out real-time communication according to a calculation result and the preset algorithm.
Specifically, in the present invention, the controller can be implemented by an industrial controller or a single chip microcomputer in the prior art.
A signal generator, which is used as an incident wave generation and transmission module and comprises: 1. generating and transmitting a transmission wave; 2. a communication function; 3. and adjusting the functions of generating and transmitting the incident wave according to the parameters given by the communication signaling.
Specifically, in the invention, the module adopts an incident wave generating and sending function based on a CPLD (Complex Programmable Logic Device) as a kernel, has IIC (Inter-integrated circuit bus) and SPI (Serial Peripheral Interface) communication functions, and realizes that the time width of the incident wave is continuously adjustable in 0-10 microseconds and the amplitude of the incident wave is adjustable in 0-1500 volts.
The module is used as a signal acquisition and filtering module and is provided with: 1. an analog/digital (analog signal to digital signal) conversion function of a voltage signal or a current signal; 2. digital signal filtering functions including, but not limited to, high pass filtering, band pass filtering, low pass filtering; 3. a storage function for storing the analog/digital converted digital signal; 4. and a communication function of transmitting the converted digital signal through a communication interface.
Specifically, in the present invention, the module adopts a collector based on a DSP (Digital Signal Processor) as a core for collecting analog signals. The module realizes the analog-to-digital conversion function of 1000Mhz, the storage function of 1000Kbit and the communication function of USB (Universal Serial Bus).
Further, fig. 2 is a flowchart of a control method corresponding to the above hardware of the present invention, which specifically includes the following steps:
step 1, a controller sends an incident wave sending instruction command to a signal generator; the instructions contain at least one or more of the following parameters: incident wave time width, incident wave amplitude, incident wave transmitting frequency, incident wave polarity (positive polarity pulse or negative polarity pulse) and signal generator number; the indication information is transmitted by any one of the following communication methods: USB, IIC, SPI, GPIO module.
And 2, after receiving the incident wave sending indication command, the signal generator configures a hardware module of the signal generator according to the configuration content in the incident wave sending indication command, and sends the incident wave according to the configuration content.
Specifically, if the "incident wave sending instruction" command received by the signal generator includes a signal generator number, the signal generator checks whether the number is consistent with its own number, and if so, continues the following steps, and if not, the signal generator does not continue the following steps.
Specifically, the signal generator configures a hardware module of the signal generator according to configuration content in the "incident wave sending indication" instruction, and the specific hardware configuration content includes one or more of the following parameters: incident wave time width, incident wave amplitude, incident wave transmission frequency, incident wave duty ratio, and incident wave polarity (positive polarity pulse or negative polarity pulse).
And 3, the signal generator sends a response command to the controller. The instructions contain one or more of the following parameters: signal generator number, success or failure indication.
Further, the controller receives the 'answer' instruction, and if the instruction comprises a 'success' instruction, the controller continues to perform the following steps; if the command includes a "fail" indication, the controller repeats the operation of step 1, or the whole process is finished.
Step 4, the controller sends a 'collecting instruction' instruction to the collector, and the instruction at least comprises one or more of the following parameters: the method comprises the following steps of sampling number, sampling frequency, sampling amplitude range, sampling time length, quantization digit of each sampling point and filtering mode of a collector; the instruction is sent by any one of the following communication methods: USB, IIC, SPI, GPIO module.
Specifically, if the "acquisition instruction" instruction received by the acquirer includes an acquirer number, the acquirer checks whether the number is consistent with its own number, if so, continues to perform the following steps, and if not, does not continue to perform the following steps.
And 5, the collector sends a response instruction to the controller. The instructions contain one or more of the following parameters: collector number, success or failure indication.
Further, the controller receives the 'response' instruction, if the instruction comprises a 'success' instruction, the acquisition instruction configuration of the collector by the controller is realized, and the controller continues to perform the following steps; if the command includes a "fail" indication, the controller repeats the operation of step 4, or the whole process is finished.
And 6, configuring a hardware module of the collector according to the configuration content in the acquisition instruction command in the step 4 by the collector, and performing signal acquisition and signal processing according to the configuration content.
Specifically, the collector configures the hardware module of the collector according to the configuration content in the "collection instruction" instruction in step 4, and the specific hardware configuration content includes one or more of the following parameters: sampling frequency, sampling amplitude range, sampling time length, quantization digit of each sampling point, total sampling point number and filtering mode.
And 7, the collector sends a waveform data transmission instruction to the controller module. The instructions include: and (4) acquiring the incident wave and reflected wave waveform data and/or the serial number of the acquisition unit according to the 'acquisition instruction' instruction requirement in the step 4.
And 8, the controller sends a response instruction to the collector. The instructions contain one or more of the following parameters: collector number, success or failure indication.
Further, after the controller receives the "waveform data transmission" instruction, if the instruction includes the collector number, the controller checks whether the number is consistent with the collector number sent in the "collection instruction" in step 4, if so, the controller stores the waveform data and continues to perform the following steps, and if not, the controller does not continue to perform the following steps.
Further, the collector receives the 'answer' instruction, if the number of the collector is included, the collector checks whether the number is consistent with the number of the collector, and if the number is consistent with the number of the collector, the following steps are continued; if not, the collector does not continue the following steps.
Further, if the command includes a success indication, which indicates that the controller has correctly processed the waveform data transmission command in the step 7, the acquisition step of the collector is completed; if the instruction includes a "failure" indication, the collector repeats the operation of step 7, or the whole process is finished.
Step 9, analyzing data; the data analysis process is realized by a controller, and the controller analyzes and controls according to the data of the incident wave and the reflected wave acquired in the step 7.
Fig. 3 is a specific analysis and control flow of the controller in step 9, which is expressed as follows:
and a, judging whether the incident wave and the reflected wave are mixed or not by the controller according to the data of the incident wave and the reflected wave acquired in the step 7. If the waveform aliasing phenomenon occurs, the controller reduces the transmission time width of the incident wave, and the control flow is ended. Further, narrowing the incident wave transmission time width is determined in the case of aliasing, and the amount of narrowing needs to be larger as the aliasing is larger, and is smaller as the aliasing is larger. And if the waveform aliasing phenomenon does not occur, the controller performs the next control judgment.
b, the controller calculates the maximum value of the amplitude of the reflected wave according to the data of the incident wave and the reflected wave acquired in the step 7, and judges whether the maximum value is greater than a preset threshold value; further, calculating the maximum value of the reflected wave amplitude means obtaining the maximum value of the reflected wave amplitude by a size comparison method. Further, the preset threshold is a fixed value or a fixed value multiplied by the maximum value of the incident wave amplitude or a fixed value multiplied by the average value of the incident wave amplitude or a fixed value multiplied by the range of the sampling amplitude in the "acquisition instruction" command of step 4. If the maximum value of the reflected wave amplitude is smaller than the threshold value, the controller increases the amplitude of the incident wave or increases the time width of the incident wave, and the control flow is ended. If the maximum value of the reflected wave amplitude is larger than the preset threshold value, the controller carries out the next control judgment;
c, the controller calculates the area enveloped by the reflected wave and the time axis according to the data of the incident wave and the reflected wave acquired in the step 7, and judges whether the area is larger than a preset threshold value or not; further, calculating the area enclosed by the reflected wave and the time axis means calculating by an integral mathematical method; further, the preset threshold is a fixed value or an area enveloped by the incident wave and the time axis multiplied by a fixed value. If the area size is smaller than the threshold value, the controller increases the amplitude size of the incident wave or increases the time width of the incident wave, and the control flow is ended. Otherwise, the control flow is directly ended.
Step 10, according to the result obtained by analyzing the data in the step 9, if the incident wave sending parameter needs to be adjusted, the controller returns to the step 1 to carry out control and command sending; if the incident wave parameters do not need to be adjusted, the whole process is finished.
The invention is further illustrated by the following specific examples.
In the specific embodiment 1, a method and a system for controlling the time width and the amplitude of incident waves are realized by three modules. Wherein, the controller is realized by adopting an industrial controller in the prior art; the signal generator is realized by adopting an incident wave generating device of a CPLD kernel; the collector is realized by adopting an analog signal collecting device of a DSP core. The controller communicates with the signal generator through an SPI interface, and the controller communicates with the collector through a USB interface.
Step 1: the controller sends an incident wave sending instruction command to the signal generator through the SPI; the specific format of the instruction is as follows:
1F 1A FF FF 1B FF FF 1C FF 1D FF 1E FF 00
wherein the instruction content is represented in hexadecimal;
further, in the specific embodiment 1, the specific content of the "incident wave sending instruction" instruction is as follows:
1F 1A 00 02 1B 01 90 1C 64 1D FF 1E 01 00
it represents the specific meanings of: the time width of an incident wave is 0.2 microsecond, the amplitude of the incident wave is 400V, the sending frequency of the incident wave is 100 Hz, the polarity of the incident wave is negative, and the number of a signal generator is 1;
step 2: after receiving the 'incident wave sending instruction' instruction through the SPI interface, the signal generator (number 1) checks that the number 1 of the signal generator in the instruction is consistent with the number of the signal generator, and further configures a hardware module of the signal generator according to the configuration content in the 'incident wave sending instruction' instruction, and sends the incident wave according to the configuration content.
And step 3: the signal generator sends a 'response' command to the controller through the SPI interface. The specific format of the instruction is as follows:
3F 3A FF 3B FF 00
wherein the instruction content is represented in hexadecimal;
further, the specific content of the "answer" instruction in step 3 in embodiment 1 is:
3F 3A 01 3B 00 00
it represents the specific meanings of: number 1 of signal generator, incident wave sending success;
step 4, the controller sends an acquisition instruction command to the acquisition device through the USB interface; the specific format of the instruction is as follows:
4F 4A FF 4B FF FF 4C FF 4D FF FF 4E FF 40FF 00
wherein, the instruction content is expressed in hexadecimal, and the meaning of each field is as follows;
further, in step 4 of embodiment 1, the specific content of the "acquisition instruction" instruction is as follows:
4F 4A 02 4B 00 64 4C 1E 4D 03E8 4E 0C 40 01 00
it represents the specific meanings of: the number of the collector is 2, the sampling frequency is 100 MHz, the sampling amplitude range is 30V, the sampling time length is 100 ms, the quantization digit of each sampling point is 12 bits, and the filtering mode is non-filtering.
And 5: after receiving the acquisition instruction, the acquisition device (number 2) checks that the acquisition device number 2 in the instruction is consistent with the self number 2, and the acquisition device sends an answer instruction to the controller through the USB interface. The specific format of the instruction is as follows:
5F 5A FF 5B FF 00
wherein the instruction content is represented in hexadecimal; the meaning of the specific fields is as follows.
Further, the specific content of the "answer" instruction in step 5 in embodiment 1 is:
5F 5A 02 5B 00 00
it represents the specific meanings of: collector number 2, collector configuration "success";
and 6, the collector configures a hardware module of the collector according to the configuration content in the instruction of 'acquisition instruction' in the step 4, wherein the sampling frequency is 100 MHz, the sampling amplitude range is 30V, the sampling time length is 100 milliseconds, the quantization bit number of each sampling point is 12 bits, and the filtering mode is non-filtering, and performs signal acquisition and signal processing according to the configuration content.
And 7, the collector sends a waveform data transmission instruction to the controller through the USB interface. The specific format of the instruction is as follows:
7F 7A FF 7B FF FF FF FF 7C FF……FF 00
wherein the instruction content is represented in hexadecimal; the meaning of the specific fields is as follows.
Further, the specific content of the "waveform data transmission" instruction in step 7 in embodiment 1 is:
7F 7A 02 7B 00 00 00 09 7C 11 22 33 44 55 66 77 88 99 00
it represents the specific meanings of: the collector number 2, the length of the waveform data is 9 bytes, and the specific content of the waveform data is as follows:
11 22 33 44 55 66 77 88 99；
and 8: after receiving the 'waveform data transmission' instruction in the step 7, the controller checks that the number of the collector in the 'waveform data transmission' is consistent with the number of the collector sent in the 'collection instruction' in the step 4; next, the controller sends an "answer" instruction to the collector (number 2) through the USB interface. The specific format of the instruction is as follows:
8F 8A FF 8B FF 00
wherein the instruction content is represented in hexadecimal; the meaning of the specific fields is as follows.
Further, the specific content of the "answer" instruction in step 8 in embodiment 1 is:
8F 8A 02 8B 00 00
it represents the specific meanings of: collector number 2, controller receiving step 7 "waveform data transmission" instruction "success";
step 9, the controller judges that the incident wave and the reflected wave are not subjected to aliasing according to the data of the incident wave and the reflected wave acquired in the step 7; the maximum value of the reflected wave amplitude obtained by comparing the magnitudes is 7 volts, the preset threshold value is 1/6 of the sampling amplitude range in the acquisition instruction command in the step 4, in this embodiment, 5 volts, so that the maximum value of the reflected wave amplitude is greater than the preset threshold value; the area enveloped by the reflected wave and the time axis is calculated to be 5 through an integration method, the preset threshold value is that the area 10 enveloped by the incident wave and the time axis is multiplied by a fixed value 1/3 to be equal to 3, and the area enveloped by the reflected wave and the time axis is larger than the preset threshold value.
Step 10, according to the data analysis of the controller in step 9, the incident wave sending parameter does not need to be adjusted in embodiment 1, and the whole control flow is ended.
In summary, the present invention provides a pulse emission control method and a pulse emission control system for controlling the time width and amplitude of an incident wave, so as to accurately measure the time difference between the incident wave and the reflected wave, thereby obtaining an accurate cable length value, further determining the location of a fault point of a power cable, reducing the power failure time, improving the power supply reliability, and reducing the fault repair cost and the loss caused by power failure.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A pulse transmission control method, characterized by comprising the steps of:
step 1, a controller sends an incident wave sending instruction command to a signal generator;
step 2, the signal generator receives an incident wave sending indication command, configures a hardware module of the signal generator according to configuration content in the incident wave sending indication command, and sends incident waves according to the configuration content;
step 3, the signal generator sends an 'answer' instruction to the controller, and if the 'answer' instruction comprises a 'success' instruction, the controller continues to carry out the step 4; if the 'answer' instruction contains 'failure' indication, the controller repeats the operation of the step 1 or finishes the whole process;
step 4, the controller sends an acquisition instruction command to the acquisition device;
step 5, the collector feeds back and sends an 'answer' instruction to the controller, and if the instruction comprises a 'success' instruction which indicates that the acquisition instruction configuration of the collector by the controller is realized, the controller continues to carry out step 6; if the instruction contains a 'failure' indication, the controller repeats the operation of the step 4 or finishes the whole process;
step 6, the collector configures a hardware module of the collector according to the configuration content in the instruction of collecting indication in the step 4, and performs signal collection and signal processing according to the configuration content;
step 7, the collector sends a waveform data transmission instruction to the controller module; the instructions include: acquiring the waveform data of the incident wave and the reflected wave and/or the serial number of the acquisition unit according to the instruction of acquiring indication in the step 4;
step 8, the controller sends a 'response' instruction to the collector; the instructions contain one or more of the following parameters: collector number, success or failure indication;
after the controller receives the waveform data transmission command, if the command contains the collector number, the controller checks whether the number is consistent with the number of the collector sent in the acquisition instruction command in the step 4, if so, the controller stores the waveform data and continues to perform the step 9;
the collector receives the 'answer' instruction, if the 'answer' instruction contains the collector number, the collector checks whether the number is consistent with the self number, and if so, the step 9 is continued;
if the command comprises a success indication, the controller is indicated to correctly process the waveform data transmission command in the step 7, and the acquisition step of the acquisition device is finished; if the instruction contains a 'failure' instruction, the collector repeats the operation of the step 7 or finishes the whole process;
step 9, the controller judges whether the incident wave sending parameters need to be adjusted according to the data of the incident waves and the reflected waves acquired in the step 7; if the controller judges that the incident wave sending parameters need to be adjusted, the controller returns to the step 1 to carry out control and command sending; and if the incident wave sending parameters do not need to be adjusted, ending the whole process.
2. The pulse transmission control method according to claim 1, wherein the "incident wave transmission instruction" instruction in step 1 includes at least one or more of the following parameters: the method comprises the steps of incident wave time width, incident wave amplitude, incident wave sending frequency, incident wave polarity and signal generator number.
3. The pulse emission control method according to claim 1, wherein the configuration content of the hardware module of the signal generator in step 2 comprises one or more of the following parameters: the method comprises the steps of incident wave time width, incident wave amplitude, incident wave sending frequency, incident wave duty ratio and incident wave polarity.
4. The pulse emission control method according to claim 1, wherein the "acquisition instruction" command includes at least one or more of the following parameters: the sampling device comprises a collector number, a sampling frequency, a sampling amplitude range, a sampling time length, a quantization bit number of each sampling point and a filtering mode.
5. The pulse emission control method according to claim 1, wherein the configuration content of the hardware module of the collector in step 6 includes one or more of the following parameters: sampling frequency, sampling amplitude range, sampling time length, quantization digit of each sampling point, total sampling point number and filtering mode.
6. The method according to any one of claims 1 to 5, wherein the specific method for the controller to determine whether the incident wave transmission parameter needs to be adjusted in step 9 includes the following steps:
a. the controller judges whether the incident wave and the reflected wave are subjected to aliasing or not according to the data of the incident wave and the reflected wave acquired in the step 7, if the waveform aliasing phenomenon occurs, the controller reduces the sending time width of the incident wave, and the control flow is ended; if the waveform aliasing phenomenon does not occur, the controller performs the next control judgment;
b. the controller calculates the maximum value of the amplitude of the reflected wave according to the data of the incident wave and the reflected wave acquired in the step 7, and judges whether the maximum value is greater than a preset threshold value; if the maximum value of the amplitude of the reflected wave is smaller than the threshold value, the controller increases the amplitude of the incident wave or increases the time width of the incident wave, and the control flow is ended; if the maximum value of the reflected wave amplitude is larger than the preset threshold value, the controller carries out the next control judgment;
c. the controller calculates the area of the envelope of the reflected wave and the time axis according to the data of the incident wave and the reflected wave acquired in the step 7, and judges whether the area is larger than a preset threshold value or not; if the area is smaller than the threshold value, the controller increases the amplitude of the incident wave or increases the time width of the incident wave, the control flow is ended, otherwise, the control flow is directly ended.
7. The pulse transmission control method according to claim 6, wherein the reduction of the incident wave transmission time width is determined in the case of aliasing, and the amount of reduction needs to be larger as the aliasing is larger, and smaller as the aliasing is smaller.
8. The pulse emission control method according to claim 7, wherein the calculation of the maximum value of the reflected wave amplitude is to obtain the maximum value of the reflected wave amplitude by a magnitude comparison method.
9. The method according to claim 8, wherein the predetermined threshold is a fixed value or a fixed value multiplied by a maximum value of the incident wave amplitude or a fixed value multiplied by an average value of the incident wave amplitude or a fixed value multiplied by a range of the sampling amplitude in the "acquisition instruction" command of step 4.
10. A pulse transmission control system, comprising:
the controller is used for sending an incident wave sending instruction command to the signal generator and receiving a feedback instruction, sending an acquisition instruction command to the collector and receiving the feedback instruction, and analyzing data of the received feedback instruction;
the signal generator is used for receiving the incident wave sending indication command, configuring a hardware module of the signal generator according to the configuration content in the incident wave sending indication command, sending the incident wave according to the configuration content, and feeding back the sending result to the controller through the response command;
and the collector is used for receiving the acquisition instruction, configuring a hardware module of the collector, carrying out signal acquisition and signal processing according to the configuration content and sending a feedback instruction to the controller.
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