Distribution network distributed traveling wave monitoring simultaneous time service method and system and electronic equipment

Abstract

The invention relates to the technical field of motor design, and particularly discloses a distribution network distributed traveling wave monitoring simultaneous time service method and system and electronic equipment, and the method comprises the steps: installing a traveling wave monitoring terminal at a key node of a distributed distribution network system, initializing an initial value of a counter, a capture channel and a capture register in the traveling wave monitoring terminal; pulse per second capturing and recording and serial port time obtaining are achieved through a GPS module in the traveling wave monitoring terminal; and setting a traveling wave current signal comparison threshold value, and carrying out comparison and pulse capture on the traveling wave current signal to realize synchronous processing of the traveling wave current signal. According to the distribution network distributed traveling wave monitoring simultaneous time service system, the precision requirement of synchronous time service of the traveling wave monitoring simultaneous time service system can be met only by using internal resources of the single chip microcomputer, no external device needs to be added, the operation power consumption and cost of the whole system are reduced, and a powerful guarantee is provided for reliable operation of a power distribution network.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power technology, and in particular to a distribution network distributed traveling wave monitoring and simultaneous timing method, a distribution network distributed traveling wave monitoring and simultaneous timing system and an electronic device. Background Art

[0002] Traveling wave monitoring and simultaneous timing technology is mainly used for fault location of power system distribution lines. By accurately monitoring traveling wave signals and achieving high-precision synchronous timing, the location of the fault can be quickly and accurately determined to ensure the safe and stable operation of the power system.

[0003] The existing distribution network distributed traveling wave ranging technology faces multiple technical challenges in practical applications. First, the terminal positioning accuracy is low. Although it can meet the basic requirements of transmission line operation and maintenance patrol, its positioning accuracy still needs to be improved for distribution network lines with complex network topology, many branches and mixed racks. Secondly, the existing terminals are mainly used in transmission line scenarios with large current grounding systems. In small current grounding systems such as distribution lines, the fault characteristics are not obvious, and it is difficult for traditional devices to ensure sampling accuracy. In addition, there is a problem of uneven load current distribution in the distribution line. Some branches are lightly loaded and the load current is small. Traditional terminal devices are difficult to meet the requirements in terms of power extraction efficiency and timekeeping accuracy. Finally, the cost of traditional devices is high, which is not conducive to large-scale promotion and application. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the purpose of the present invention is to propose a distribution network distributed traveling wave monitoring and simultaneous timing method, system and electronic device to improve the accuracy and efficiency of fault location in the power system.

[0005] To achieve the above object, the first embodiment of the present invention provides a distribution network distributed traveling wave monitoring and timing method, the method comprising the following steps:

[0006] Install the traveling wave monitoring terminal at the key nodes of the distributed distribution network system, and initialize the initial value of the counter, capture channel and capture register in the traveling wave monitoring terminal;

[0007] The GPS module in the traveling wave monitoring terminal is used to capture and record second pulses and obtain serial port time.

[0008] Set the traveling wave current signal comparison threshold value, compare the traveling wave current signal and capture the pulse, and realize the synchronous processing of the traveling wave current signal;

[0009] The time below one second is calculated based on the captured traveling wave current pulse value, and the location of the cable fault is determined by the traveling wave propagation time difference and propagation speed using the topology information of the distributed distribution network system and the serial port time of the fault moment calculated by each terminal;

[0010] Record and store fault data, upload fault information to the distribution network control center through the communication network, make comprehensive judgment and confirmation of the fault location, and issue alarm information;

[0011] Further analyze the fault data and optimize the distribution network operation and maintenance strategies.

[0012] In some embodiments of the present invention, the step of initializing the initial value of the counter, the capture channel and the capture register in the traveling wave monitoring terminal includes:

[0013] Set the initial value of counter N to 0;

[0014] Configuring the capture channels to be in a capture-ready state, the capture channels including capture channel 1, capture channel 2 and capture channel 3;

[0015] Initialize the capture register to 0, the capture register includes capture register 1, capture register 2 and capture register 3.

[0016] In some embodiments of the present invention, the pulse-per-second capture mechanism includes:

[0017] The capture channel 1 of each terminal continuously monitors the pulse-per-second signal output by the GPS module. When the rising edge of the pulse-per-second signal appears, the capture channel 1 immediately captures the rising edge and loads the count value of the counter N at this time into the capture register 1, which is recorded as N1. t At the same time, the terminal records the capture value of the last second as N1 t-1 .

[0018] In some embodiments of the present invention, the step of setting the traveling wave current signal comparison threshold value includes:

[0019] According to the cable characteristics and operating parameters of the distributed distribution network system, the single chip microcomputer in the terminal calculates the corresponding digital signals according to the predetermined threshold value, and sends these digital signals to the digital-to-analog converter 1 and the digital-to-analog converter 2 respectively;

[0020] After receiving the digital signal, the DAC 1 and DAC 2 convert it into analog signal, and use these analog signals as the negative polarity of the input of the comparator, and then set the traveling wave current signal comparison threshold value at the negative pole of the comparator 1 and the comparator 2.

[0021] In some embodiments of the present invention, the step of comparing the traveling wave current signal comprises:

[0022] The traveling wave monitoring terminal continuously monitors the traveling wave current analog signal in the cable. When the traveling wave current analog signal enters the terminal, it is directly input into the positive poles of comparator 1 and comparator 2;

[0023] Comparator 1 and Comparator 2 will compare the traveling wave current analog signal input at the positive pole with the comparison threshold value set at the negative pole in real time. As long as the traveling wave current analog signal is greater than the comparison threshold value set at the negative pole of the comparator, Comparator 1 and Comparator 2 will immediately generate an output signal.

[0024] In some embodiments of the present invention, the pulse capturing step comprises:

[0025] When comparator 1 outputs a signal, its output pulse will be quickly captured by capture channel 2, and capture channel 2 records the count value corresponding to the pulse as N2;

[0026] When comparator 2 outputs a signal, its output pulse will be captured by capture channel 3, and capture channel 3 records the corresponding count value N3.

[0027] In some embodiments of the present invention, the step of calculating the time in seconds based on the captured traveling wave current pulse value includes:

[0028] For the traveling wave current pulse value captured by each terminal, the time below seconds is calculated according to the following formula:

[0029] t 秒 =(Ni-N1 t ) / (N1 t -N1 t-1 ),

[0030] Wherein, i=2,3; t represents the count value related to time.

[0031] In some embodiments of the present invention, the step of using the topology information of the distributed distribution network system and the serial port time at the time of the fault calculated by each terminal to determine the location of the cable fault by the traveling wave propagation time difference and propagation speed includes:

[0032] When multiple terminals capture the traveling wave current pulse and calculate their respective sub-second time t, the cable length, distance between terminals and other topological information known in the distributed distribution network system are used, combined with the serial port time of the fault moment calculated by each terminal, and the cable fault moment calculation formula is finally obtained:

[0033] T = serial port time + t 秒 .

[0034] To achieve the above object, the second embodiment of the present invention proposes a distribution network distributed traveling wave monitoring and timing system, the system comprising: a traveling wave monitoring terminal arranged on the distributed distribution network system, the traveling wave monitoring terminal comprising:

[0035] MCU motherboard and its internal resources: As the core of the system, the MCU motherboard is used to control the operation of the entire system; its internal resources include counter N, which is used to provide an accurate time reference;

[0036] GPS module: The GPS module is used to receive satellite signals and output serial time signals and second pulse signals. The module is connected to the main control chip through the USART interface to provide accurate time information for the system;

[0037] Digital-to-analog converter 1 and digital-to-analog converter 2: The two digital-to-analog converters are used to set the comparison threshold value of the traveling wave current signal. The two digital-to-analog converters are connected to the comparator of the main control chip to form a detection circuit for the traveling wave current signal.

[0038] Main control chip: The main control chip includes comparator 1, comparator 2 and capture channel. The comparator is used to connect to the digital-to-analog converter to detect whether the traveling wave current signal exceeds the threshold value; the capture channel is used to capture the second pulse signal of the GPS module and the pulse signal output by the comparator, and store the captured value in the corresponding capture register.

[0039] Calculation module: The calculation module calculates the fault moment based on the captured values.

[0040] To achieve the above-mentioned purpose, the third aspect of the present invention proposes an electronic device, including a memory, a processor and a computer program stored on the memory. When the computer program is executed by the processor, the above-mentioned distribution network distributed traveling wave monitoring and simultaneous timing method is implemented.

[0041] The distributed traveling wave monitoring and simultaneous timing method, system and electronic device for distribution network of the embodiments of the present invention can meet the accuracy requirements of synchronous timing of the traveling wave monitoring and simultaneous timing system by using only the internal resources of the single-chip microcomputer, without adding any peripheral devices, thereby reducing the power consumption and cost of the entire system operation; secondly, since no peripheral devices are added, the system is more concise and reliable, which improves the power supply efficiency and timing accuracy of the monitoring terminal under low load of the distribution network, and ensures that the device can adapt to working in a light load environment of the distribution network; finally, the traveling wave monitoring and simultaneous timing method and system improve the accuracy and efficiency of fault location, and provide a strong guarantee for the reliable operation of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a flow chart of a method for distributed traveling wave monitoring and simultaneous timing of a distribution network according to an embodiment of the present invention;

[0043] Figure 2 It is a schematic diagram of the internal structure of a traveling wave monitoring terminal in a distribution network distributed traveling wave monitoring and simultaneous timing system according to another embodiment of the present invention;

[0044] Figure 3 It is a schematic structural diagram of an electronic device according to another embodiment of the present invention. DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0046] The following describes a method, system and electronic device for simultaneous timing of distributed traveling wave monitoring in a distribution network according to an embodiment of the present invention with reference to the accompanying drawings.

[0047] Figure 1 It is a flow chart of a method for distributed traveling wave monitoring and simultaneous timing of a distribution network according to an embodiment of the present invention.

[0048] like Figure 1 As shown, the distribution network distributed traveling wave monitoring and timing method includes:

[0049] A method for distributed traveling wave monitoring and simultaneous timing of a distribution network comprises the following steps:

[0050] S1. Install the traveling wave monitoring terminal at the key node of the distributed distribution network system, and initialize the initial value of the counter, capture channel and capture register in the traveling wave monitoring terminal.

[0051] As an example, key nodes include cable branches and substation outlets. When the line structure at the cable branch changes, the probability of a fault is relatively high. The installed terminal can monitor the operating status of the branch line in a timely manner. The substation outlet is also an important location. As the source of power transmission, monitoring its outlet helps to quickly locate the source of the fault and ensure the power supply stability of the entire distribution network system.

[0052] S2. The GPS module in the traveling wave monitoring terminal is used to capture and record the second pulse and obtain the serial port time.

[0053] It should be noted that the terminal receives the serial time signal sent by the GPS module through the USART interface. The serial time signal contains rich and accurate time information, such as year, month, day, hour, minute, second, etc. The terminal's built-in parsing program will carefully parse the received serial time signal and accurately extract the time information, providing a unified time reference for the entire distributed distribution network system, ensuring that each monitoring terminal maintains a high degree of synchronization in time, thereby improving the accuracy of fault location.

[0054] S3. Setting a traveling wave current signal comparison threshold value, comparing the traveling wave current signal and pulse capturing, so as to realize synchronous processing of the traveling wave current signal.

[0055] In some embodiments of the present invention, the step of setting the traveling wave current signal comparison threshold value includes:

[0056] According to the cable characteristics and operating parameters of the distributed distribution network system, the microcontroller in the terminal calculates the corresponding digital signals according to the predetermined threshold value, and sends these digital signals to digital-to-analog converter 1 (DAC1) and digital-to-analog converter 2 (DAC2) respectively;

[0057] After receiving the digital signal, the digital-to-analog converter 1 and the digital-to-analog converter 2 convert it into an analog signal, and use these analog signals as the negative polarity of the input of the comparator, and then set the traveling wave current signal comparison threshold value at the negative pole of the comparator 1 and the comparator 2. In this way, the traveling wave current signal comparison threshold value is accurately set at the negative pole of the comparator 1 and the comparator 2, so as to prepare for the subsequent accurate detection of the traveling wave current signal.

[0058] S4. Calculate the time below the second based on the captured traveling wave current pulse value, and use the topological information of the distributed distribution network system and the serial port time of the fault moment calculated by each terminal to determine the location of the cable fault through the traveling wave propagation time difference and propagation speed. This positioning method combining time and topological information can effectively overcome the challenges brought by the complex structure of the distribution network system and achieve high-precision fault positioning.

[0059] S5. Record and store fault data, upload fault information to the distribution network control center through the communication network, make comprehensive judgment and confirmation of the fault location, and issue an alarm message;

[0060] As an example, the fault data includes the fault time, captured values, and other related data.

[0061] S6. Further analyze the fault data and optimize the distribution network operation and maintenance strategy.

[0062] In some embodiments of the present invention, the steps of initializing the initial value of the counter, the capture channel and the capture register in the traveling wave monitoring terminal include:

[0063] Set the initial value of counter N to 0;

[0064] Configuring the capture channels to be in a capture-ready state, the capture channels including capture channel 1, capture channel 2 and capture channel 3;

[0065] Initialize the capture register to 0, the capture register includes capture register 1, capture register 2 and capture register 3.

[0066] In addition, the GPS module needs to be started and tested. Start the GPS module and perform a series of tests on it to ensure its normal operation, including:

[0067] First, check whether the GPS module can stably receive satellite signals, which is a prerequisite for obtaining accurate time information; secondly, verify whether it can accurately output the pulse per second (pps) signal and serial port time signal to the main control chip through the USART interface. Only when the GPS module performs normally in these two aspects can the entire system rely on the time reference it provides for subsequent synchronization and fault location operations.

[0068] In some embodiments of the present invention, the pulse-per-second capture mechanism includes:

[0069] The capture channel 1 of each terminal continuously monitors the pulse-per-second signal output by the GPS module. When the rising edge of the pulse-per-second signal appears, the capture channel 1 immediately captures the rising edge and loads the count value of the counter N at this time into the capture register 1, which is recorded as N1. t At the same time, the terminal records the capture value of the last second as N1 t-1 ,These captured values ​​will serve as an important basis for the subsequent calculation of the fault moment.

[0070] In some embodiments of the present invention, in addition to using the first digital-to-analog converter and the second digital-to-analog converter to set the threshold value of the traveling wave current, the threshold value may also be determined based on the characteristics of cables in the distribution network system.

[0071] Consider factors such as the cable material, cross-sectional area, and insulation performance, which will affect the transmission characteristics of the traveling wave current in the cable. At the same time, combined with the operating parameters of the distribution network system, such as rated voltage, rated current, load conditions, etc., a comprehensive analysis is performed to determine the appropriate threshold value for the traveling wave current. For example, for cables with good insulation performance and light load, the threshold value can be appropriately lowered to increase the detection sensitivity of weak fault signals; for cables with high load and long-distance transmission, the threshold value needs to be adjusted according to the actual situation to avoid misjudgment.

[0072] In some embodiments of the present invention, the step of comparing the traveling wave current signal comprises:

[0073] The traveling wave monitoring terminal continuously monitors the traveling wave current analog signal in the cable. When the traveling wave current analog signal enters the terminal, it is directly input into the positive pole of comparator 1 and comparator 2. Comparator 1 and comparator 2 will compare the traveling wave current analog signal input into the positive pole with the comparison threshold value set at the negative pole in real time. As long as the traveling wave current analog signal is greater than the comparison threshold value set at the negative pole of the comparator, comparator 1 and comparator 2 will immediately generate an output signal.

[0074] In some embodiments of the present invention, the step of performing pulse capture on the signals output by the comparator 1 and the comparator 2 includes:

[0075] When comparator 1 outputs a signal, its output pulse will be quickly captured by capture channel 2, and capture channel 2 records the count value corresponding to the pulse as N2;

[0076] When comparator 2 outputs a signal, its output pulse will be captured by capture channel 3, which records the corresponding count value N3. These capture values ​​N2 and N3 contain the time information of the traveling wave current signal arriving at different monitoring points, which is of key significance for the subsequent accurate calculation of the fault time and positioning of the fault position.

[0077] In some embodiments of the present invention, the time less than one second is calculated according to the captured traveling wave current pulse value N2 or N3, and the calculation formula is:

[0078] t 秒 =(Ni-N1 t ) / (N1 t -N1 t-1 ),

[0079] In the formula, i=2,3; t is not a time variable, but a mark indicating a count value related to time.

[0080] The principle of this formula is to calculate the exact time of arrival of the traveling wave current pulse based on the count change of counter N between two GPS second pulses. By comparing the capture value Ni with the second pulse capture value N1 t And the pulse capture value N1 of the previous second t-1 The relationship between them can accurately calculate the time interval of the traveling current pulses below seconds.

[0081] It should be noted that during the calculation process, the counting characteristics of counter N need to be fully considered. Counter N will automatically return to zero and start counting again after counting to the maximum value. For example, when N2 <N1 t And N1 t-1When the counter is close to its maximum value, it means that the counter has completed a counting cycle and restarted counting. At this time, it is necessary to add N2 to the maximum count value of the counter and then substitute it into the formula for calculation to ensure the accuracy of the calculation result. This correct handling of the counter counting characteristics is an important part of ensuring the accuracy of the calculation at the time of the fault.

[0082] It should also be noted that i is 2 and 3 because there are two capture channels (capture channel 2 and capture channel 3) and corresponding comparators (comparator 1 and comparator 2) related to the traveling wave current signal processing in this system. When the traveling wave current signal exceeds the threshold value, the two comparators may output pulse signals respectively. Different Ni values ​​are needed to distinguish and record the status of the counter when different comparators output pulses, so that the fault time can be accurately calculated based on these values ​​later. And i is not 1 because capture channel 1 is specifically used to capture the rising edge of the second pulse signal of the GPS module. Its function and the corresponding counter value record (N1 t and N1 t-1 ) is a different operation from the traveling wave current pulse capture. In the formula for calculating the time below seconds and the fault moment, N1 t and N1 t-1 It is used as a reference value in the calculation, while N2 and N3 are variable values ​​related to the traveling wave current pulse.

[0083] In some embodiments of the present invention, the step of using the topology information of the distributed distribution network system and the serial port time at the time of the fault calculated by each terminal to determine the location of the cable fault by the traveling wave propagation time difference and propagation speed includes:

[0084] When multiple terminals capture the traveling wave current pulse and calculate their respective sub-second time t, the cable length, distance between terminals and other topological information known in the distributed distribution network system are used, combined with the serial port time of the fault moment calculated by each terminal, and the cable fault moment calculation formula is finally obtained:

[0085] T = serial port time + t 秒 .

[0086] When using topology information for calculation, please note that:

[0087] When multiple traveling wave monitoring terminals successfully capture the traveling wave current pulse and calculate their respective times t 秒 After that, the system starts to use the known cable length, distance between terminals and other topological information in the distributed distribution network system to perform fault location calculations. According to the traveling wave propagation theory, the propagation speed of the traveling wave in the cable is relatively fixed (usually depending on the dielectric properties of the cable). By measuring the time difference between the traveling wave reaching different monitoring terminals, combined with the known distance between terminals and cable length, a geometric relationship model can be constructed to determine the location of the cable fault.

[0088] When the cable fault position is subsequently located by combining time information, the serial port time is a unified time reference obtained by parsing the GPS serial port data. The fault time of each terminal and the corresponding location information (determined by topology information) are combined, and the relationship between the traveling wave propagation time difference and the propagation speed is used. Through precise mathematical calculations, the exact location of the cable fault in the entire distributed distribution network system is finally determined. This positioning method that combines time and topology information can effectively overcome the challenges brought by the complex structure of the distribution network system and achieve high-precision fault location.

[0089] In some embodiments of the present invention, the practical significance of recording and storing fault data is that these other related data include the current, voltage and other operating parameters of the cable when the fault occurs, which are of great value for in-depth analysis of the cause and characteristics of the fault. For example, by analyzing the current change curve at the time of the fault, the current impact at the moment of the fault can be understood, which helps to determine whether the fault type is short circuit, open circuit or grounding.

[0090] The distributed traveling wave monitoring and timing method of the distribution network can accurately record the time when the traveling wave signal arrives at different monitoring points. For example, the high-precision pulse-per-second signal provided by the GPS module is used as the time reference, combined with the counter and capture mechanism inside the system, to accurately calculate the traveling wave propagation time, thereby achieving high-precision fault location, and the positioning accuracy can reach the meter level or even higher. Therefore, in a complex distribution network topology, whether it is a multi-branch line or a long-distance line, the fault location can be accurately determined, greatly reducing the time and labor cost of troubleshooting.

[0091] To achieve the above object, the present invention also proposes a distribution network distributed traveling wave monitoring and timing system, such as Figure 2 As shown, it includes a traveling wave monitoring terminal arranged on a node of a distributed distribution network system, and the traveling wave monitoring terminal includes:

[0092] MCU mainboard and its internal resources: As the core of the system, the MCU mainboard is used to control the operation of the entire system; its internal resources include counter N, which is used to provide an accurate time reference; counter N works under the drive of the MCU electronic clock TCKL.

[0093] GPS module: The GPS module is used to receive satellite signals and output serial time signals and pulse-per-second signals. On the one hand, the GPS module provides the serial time signal to the main control chip through the USART interface. The signal contains accurate time information such as year, month, day, hour, minute, and second, which can be directly parsed and obtained. On the other hand, the GPS module outputs a pulse-per-second pps signal every full second, which is also connected to the main control chip through the USART interface.

[0094] Digital-to-analog converter 1 (DAC1) and digital-to-analog converter 2 (DAC2): The two digital-to-analog converters are used to set the comparison threshold value of the traveling wave current signal. The two are connected to the comparator of the main control chip and together constitute the detection circuit of the traveling wave current signal. Specifically, they convert the digital signal output by the microcontroller into an analog signal and use it as the negative polarity of the input of the comparator. The line traveling wave current analog signal is directly input to the positive pole of the comparator.

[0095] Main control chip: The main control chip includes comparator 1, comparator 2 and capture channel.

[0096] The comparator is used to connect to the digital-to-analog converter to detect whether the traveling wave current signal exceeds the threshold value; Comparator 1 and Comparator 2 are connected to DAC1 and DAC2. When the digital signal value exceeds the preset current threshold value, the comparator connected to the corresponding DAC will output a high-level pulse.

[0097] The capture channel is used to capture the second pulse signal of the GPS module and the pulse signal output by the comparator, and store the captured value in the corresponding capture register. The capture channel includes capture channel 1, capture channel 2 and capture channel 3. Among them, capture channel 1 is used to capture the rising edge of the second pulse signal of the GPS module, and capture channel 2 and capture channel 3 are connected to the comparator output. Each capture channel is connected to the corresponding capture register, and the captured value is used to accurately calculate the fault time.

[0098] Calculation module: The calculation module calculates the fault moment based on the captured values.

[0099] The system uses the internal resources of the single-chip microcomputer for synchronous timing and traveling wave monitoring processing, avoiding the use of complex and high-power hardware devices, such as FPGA and high-precision temperature-compensated crystal oscillator. This can significantly reduce the operating power consumption of the monitoring terminal, extend the service life of the equipment, and reduce the maintenance frequency of the equipment. At the same time, by simplifying the hardware structure, the cost is reduced. In large-scale distribution network line monitoring, the construction cost can be effectively controlled, the economy and practicality of the technology can be improved, and it is conducive to the widespread application of traveling wave monitoring technology in distribution network systems.

[0100] Corresponding to the above embodiment, the present invention further provides an electronic device.

[0101] like Figure 3 The figure shows a schematic diagram of the structure of an electronic device in the present invention, where the electronic device 200 includes: a processor 201 and a memory 203. The processor 201 and the memory 203 are connected, such as through a bus 202. Optionally, the electronic device 200 may further include a transceiver 204. It should be noted that in actual applications, the transceiver 204 is not limited to one, and the structure of the electronic device 200 does not constitute a limitation on the embodiments of the present invention.

[0102] The processor 201 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of the present invention. The processor 201 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0103] The bus 202 may include a path to transmit information between the above components. The bus 202 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 202 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 2 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0104] The memory 203 is used to store a computer program corresponding to the method for distributed traveling wave monitoring and simultaneous timing of the distribution network in the above embodiment of the present invention, and the computer program is controlled and executed by the processor 201. The processor 201 is used to execute the computer program stored in the memory 203 to implement the contents shown in the above method embodiment.

[0105] The electronic device 200 includes but is not limited to: mobile terminals such as laptop computers, PADs (tablet computers), etc. and fixed terminals such as desktop computers, etc. Figure 2 The electronic device 200 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0106] The electronic device 200 of the embodiment of the present invention can meet the accuracy requirements of the synchronous timing of the traveling wave monitoring and timing system by using only the internal resources of the single-chip microcomputer, without adding any peripheral devices, thereby reducing the power consumption and cost of the entire system operation; secondly, since no peripheral devices are added, the system is more concise and reliable, and the power supply efficiency and timing accuracy of the monitoring terminal under low load of the distribution network are improved, ensuring that the device can adapt to working in a light load environment of the distribution network; finally, the traveling wave monitoring and timing method and system improve the accuracy and efficiency of fault location, and provide a strong guarantee for the reliable operation of the distribution network.

[0107] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0108] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0109] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0110] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0111] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for distributed traveling wave monitoring and timing in a distribution network, characterized in that: The following steps are involved: Install the traveling wave monitoring terminal at the key nodes of the distributed distribution network system, and initialize the initial value of the counter, capture channel and capture register in the traveling wave monitoring terminal; The GPS module in the traveling wave monitoring terminal is used to capture and record second pulses and obtain serial port time. Set the traveling wave current signal comparison threshold value, compare the traveling wave current signal and capture the pulse, and realize the synchronous processing of the traveling wave current signal; The time below one second is calculated based on the captured traveling wave current pulse value, and the location of the cable fault is determined by the traveling wave propagation time difference and propagation speed using the topology information of the distributed distribution network system and the serial port time of the fault moment calculated by each terminal; Record and store fault data, upload fault information to the distribution network control center through the communication network, make comprehensive judgment and confirmation of the fault location, and issue alarm information; Further analyze the fault data and optimize the distribution network operation and maintenance strategies.

2. The method for distributed traveling wave monitoring and simultaneous timing of distribution network according to claim 1, characterized in that: The step of initializing the counter initial value, capture channel and capture register in the traveling wave monitoring terminal comprises: Set the initial value of counter N to 0; Configuring the capture channels to be in a capture-ready state, the capture channels including capture channel 1, capture channel 2 and capture channel 3; Initialize the capture register to 0, the capture register includes capture register 1, capture register 2 and capture register 3.

3. The method for distributed traveling wave monitoring and simultaneous timing of distribution network according to claim 2, characterized in that: The second pulse capture mechanism includes: The capture channel 1 of each terminal continuously monitors the pulse-per-second signal output by the GPS module. When the rising edge of the pulse-per-second signal appears, the capture channel 1 immediately captures the rising edge and loads the count value of the counter N at this time into the capture register 1, which is recorded as N1. t At the same time, the terminal records the capture value of the last second as N1 t-1 .

4. The method for distributed traveling wave monitoring and simultaneous timing of distribution network according to claim 2, characterized in that: The step of setting the traveling wave current signal comparison threshold value comprises: According to the cable characteristics and operating parameters of the distributed distribution network system, the single chip microcomputer in the terminal calculates the corresponding digital signals according to the predetermined threshold value, and sends these digital signals to the digital-to-analog converter 1 and the digital-to-analog converter 2 respectively; After receiving the digital signal, the DAC 1 and DAC 2 convert it into analog signal, and use these analog signals as the negative polarity of the input of the comparator, and then set the traveling wave current signal comparison threshold value at the negative pole of the comparator 1 and the comparator 2.

5. The method for distributed traveling wave monitoring and simultaneous timing of distribution network according to claim 4, characterized in that: The step of comparing the traveling wave current signal comprises: The traveling wave monitoring terminal continuously monitors the traveling wave current analog signal in the cable. When the traveling wave current analog signal enters the terminal, it is directly input into the positive poles of comparator 1 and comparator 2; Comparator 1 and Comparator 2 will compare the traveling wave current analog signal input at the positive pole with the comparison threshold value set at the negative pole in real time. As long as the traveling wave current analog signal is greater than the comparison threshold value set at the negative pole of the comparator, Comparator 1 and Comparator 2 will immediately generate an output signal.

6. The method for distributed traveling wave monitoring and simultaneous timing of distribution network according to claim 4, characterized in that: The pulse capturing step comprises: When comparator 1 outputs a signal, its output pulse will be quickly captured by capture channel 2, and capture channel 2 records the count value corresponding to the pulse as N2; When comparator 2 outputs a signal, its output pulse will be captured by capture channel 3, and capture channel 3 records the corresponding count value N3.

7. The method for distributed traveling wave monitoring and simultaneous timing of distribution network according to claim 1, characterized in that: The step of calculating the time in seconds based on the captured traveling wave current pulse value comprises: For the traveling wave current pulse value captured by each terminal, the time below seconds is calculated according to the following formula: t 秒 =(Ni-N1 t ) / (N1 t -N1 t-1 ), Wherein, i=2,3; t represents the count value related to time.

8. The method for distributed traveling wave monitoring and simultaneous timing of distribution network according to claim 1, characterized in that: The step of using the topology information of the distributed distribution network system and the serial port time at the time of the fault calculated by each terminal to determine the location of the cable fault through the traveling wave propagation time difference and propagation speed includes: When multiple terminals capture the traveling wave current pulse and calculate their respective sub-second time t, the cable length, distance between terminals and other topological information known in the distributed distribution network system are used, combined with the serial port time of the fault moment calculated by each terminal, and the cable fault moment calculation formula is finally obtained: T = serial port time + t 秒 .

9. A distribution network distributed traveling wave monitoring and timing system, characterized in that: It includes a traveling wave monitoring terminal arranged on a distributed distribution network system, and the traveling wave monitoring terminal includes: MCU motherboard and its internal resources: As the core of the system, the MCU motherboard is used to control the operation of the entire system; its internal resources include counter N, which is used to provide an accurate time reference; GPS module: The GPS module is used to receive satellite signals and output serial time signals and second pulse signals. The module is connected to the main control chip through the USART interface to provide accurate time information for the system; Digital-to-analog converter 1 and digital-to-analog converter 2: The two digital-to-analog converters are used to set the comparison threshold value of the traveling wave current signal. The two digital-to-analog converters are connected to the comparator of the main control chip to form a detection circuit for the traveling wave current signal. Main control chip: The main control chip includes comparator 1, comparator 2 and capture channel. The comparator is used to connect to the digital-to-analog converter to detect whether the traveling wave current signal exceeds the threshold value; the capture channel is used to capture the second pulse signal of the GPS module and the pulse signal output by the comparator, and store the captured value in the corresponding capture register. Calculation module: The calculation module calculates the fault moment based on the captured values.

10. An electronic device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory. When the computer program is executed by the processor, the method for distributed traveling wave monitoring and simultaneous timing of a distribution network as described in any one of claims 1 to 8 is implemented.

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