Household change relationship identification device, method, terminal and topology structure identification system

Abstract

The present invention discloses a device, method, terminal, and topology identification system for identifying household-to-transformer relationships. The device comprises: a current acquisition module for converting a current signal on the secondary side of a transformer into an analog voltage signal, the current signal comprising a characteristic current signal carrying characteristic information output by an electric energy meter upon receiving a household-to-transformer relationship identification instruction; a first communication module for receiving the household-to-transformer relationship identification instruction; and a control module for, upon receiving the household-to-transformer relationship identification instruction, performing analog-to-digital conversion on the analog voltage signal to obtain a digital voltage signal, obtaining a noise floor power value at a frequency corresponding to the characteristic current signal based on the digital voltage signal, obtaining a valid signal determination threshold based on the noise floor power value, and obtaining characteristic information based on the digital voltage signal and the valid signal determination threshold. The device can achieve real-time and accurate identification of household-to-transformer relationships without affecting user electricity consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution networks, and in particular to a household-to-transformer relationship identification device, method, terminal, and topology structure identification system. Background Art

[0002] In the power user electricity consumption information collection system, due to issues left over from early construction, the relationship between the user's electricity meter and the transformer area or phase recorded in the concentrator's collection file may be inconsistent with the actual relationship. Since the terminal communication of the current low-voltage centralized metering system is mainly achieved through high-speed power line carrier technology, cross-transformer area communication has a significant impact on power line carrier communication, which will reduce the quality of power line carrier communication across transformer areas, affecting indicators such as the primary reading rate of the electricity consumption information collection system, and affecting the real-time collection of electricity consumption information. Therefore, it is necessary to use technical means to identify the correspondence between the user's electricity meter and the actual transformer area and the phase in which it is located in order to correct the collection file. At the same time, the correct transformer area user-transformer relationship file is the basis for transformer area line loss analysis, topology identification, and fault diagnosis.

[0003] Traditional methods for identifying household-to-substation relationships include the instantaneous power outage method and the electricity consumption data statistics method, but both methods have some inherent defects: the instantaneous power outage method has high requirements on the quality of meters due to the existence of instantaneous power outage and restoration, which has a greater impact on the power supply quality, is prone to damage user equipment, and cannot be used frequently; the electricity consumption data statistics method requires the collection of a large amount of electricity consumption data from various environments in the early stage, the establishment of a user identification model, the recording of user electricity consumption characteristics, and the implementation of household-to-substation relationship identification by applying different identification models. Its advantage is that it does not require additional identification devices and does not need to interfere with the user's normal electricity use, but the recognition rate is not high, and the recognition accuracy is related to the amount of data collected and the model matching algorithm, and cannot achieve real-time and accurate identification. Summary of the Invention

[0004] The present invention aims to at least partially address one of the technical problems in the related art. To this end, the present invention proposes a household change relationship identification device, method, terminal, and topology structure identification system, which can achieve real-time and accurate household change relationship identification without affecting user electricity consumption.

[0005] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention proposes a household-transformer relationship identification device, which includes: a current acquisition module, used to convert the current signal on the secondary side of the transformer into an analog voltage signal, the current signal including a characteristic current signal carrying characteristic information output by the electric energy meter when receiving a household-transformer relationship identification instruction; a first communication module, used to receive the household-transformer relationship identification instruction; a control module, the current acquisition module and the first communication module are respectively connected to the control module, and the control module is used to perform analog-to-digital conversion on the analog voltage signal to obtain a digital voltage signal when receiving the household-transformer relationship identification instruction, obtain the background noise power value of the frequency point corresponding to the characteristic current signal according to the digital voltage signal, obtain the effective signal judgment threshold according to the background noise power value, and obtain characteristic information according to the digital voltage signal and the effective signal judgment threshold to perform household-transformer relationship identification.

[0006] According to the household-transformer relationship identification device of an embodiment of the present invention, the current signal on the secondary side of the transformer is converted into an analog voltage signal through the current acquisition module. The current signal includes a characteristic current signal carrying characteristic information output by the electric energy meter when receiving the household-transformer relationship identification instruction. When receiving the household-transformer relationship identification instruction, the control module performs analog-to-digital conversion on the analog voltage signal to obtain a digital voltage signal, obtains the background noise power value of the frequency point corresponding to the characteristic current signal based on the digital voltage signal, obtains the effective signal judgment threshold based on the background noise power value, and obtains the characteristic information based on the digital voltage signal and the effective signal judgment threshold to perform household-transformer relationship identification, thereby realizing real-time and accurate identification of household-transformer relationship without affecting the user's electricity consumption.

[0007] According to one embodiment of the present invention, the current acquisition module includes: a current transformer interface circuit, which is connected to the current transformer on the secondary side of the transformer and is used to convert the current signal into a differential voltage signal and perform low-frequency filtering processing; an analog signal processing circuit, which is connected to the current transformer interface circuit and is used to perform differential amplification processing, bandpass filtering processing, harmonic filtering processing and analog amplification processing on the differential voltage signal after low-frequency filtering processing in sequence to obtain an analog voltage signal.

[0008] According to one embodiment of the present invention, a current transformer interface circuit includes: a sampling circuit, which is connected to the current transformer and is used to convert the current signal into a differential voltage signal; and a high-pass filter circuit, which is connected to the sampling circuit and is used to perform low-frequency filtering on the differential voltage signal through a dynamic tracking filter network.

[0009] According to one embodiment of the present invention, the analog signal processing circuit includes: a differential amplifier single-ended conversion circuit, the differential amplifier single-ended conversion circuit is connected to the current transformer interface circuit, and is used to perform differential amplification on the differential voltage signal after low-frequency filtering processing and convert it into a single-ended voltage signal; an active band-pass filter circuit, the active band-pass filter circuit is connected to the differential amplifier single-ended conversion circuit, and is used to perform band-pass filtering processing on the single-ended voltage signal; a hardware notch filter circuit, the hardware notch filter circuit is connected to the active band-pass filter circuit, and is used to perform harmonic filtering processing on the single-ended voltage signal after band-pass filtering processing; and a PGA amplifier circuit, the PGA amplifier circuit is connected to the hardware notch filter circuit, and is used to perform analog amplification processing on the single-ended voltage signal after harmonic filtering processing to obtain an analog voltage signal.

[0010] According to one embodiment of the present invention, the device also includes: a zero-crossing detection circuit for detecting the actual power frequency current frequency; a control module, further used to obtain the corresponding frequency point of the harmonic current signal according to the actual power frequency current frequency, and set the notch point parameters of the hardware notch filter circuit according to the corresponding frequency point of the harmonic current signal.

[0011] According to one embodiment of the present invention, when the analog signal processing circuit does not perform harmonic filtering on the single-ended voltage signal after bandpass filtering, the control module is also used to set the notch point parameters of the digital notch filter according to the corresponding frequency point of the harmonic current signal, so as to perform harmonic filtering on the digital voltage signal through the digital notch filter.

[0012] According to one embodiment of the present invention, the control module is further configured to adjust the amplification factor of the PGA amplifying circuit according to the background noise power value.

[0013] According to one embodiment of the present invention, the control module is specifically used to start obtaining the starting byte of the characteristic information based on the digital voltage signal when the power value of a preset number of digital voltage signals obtained continuously is greater than the valid signal judgment threshold, and to obtain the remaining bytes of the characteristic information based on the digital voltage signal when it is determined that the starting byte is correct.

[0014] According to one embodiment of the present invention, the control module is further configured to update the noise floor power value according to the digital voltage signal when the power values of the preset number of digital voltage signals are not continuously obtained to be greater than the valid signal judgment threshold, or when the starting byte is determined to be erroneous.

[0015] According to one embodiment of the present invention, the control module is also used to generate a receiving log after obtaining the characteristic information, and receive the sending log of the electric energy meter, and determine the household change relationship of the electric energy meter based on the sending log and the receiving log, wherein the receiving log includes the receiving time of the characteristic current signal, the corresponding power value and phase, the background noise power value, the receiving code value, the receiving bit error rate and at least one of the historical household change relationship identification results.

[0016] According to one embodiment of the present invention, the control module is also used to determine the household change relationship of the electric energy meter based on the household change relationship identification results of the adjacent electric energy meters of the electric energy meter when it is determined based on the received log that the signal quality of the characteristic current signal is lower than the preset quality threshold.

[0017] According to one embodiment of the present invention, the control module is further configured to redetermine the household change relationship of the electricity meter when the confidence probability of the household change relationship identification result of the electricity meter determined based on the received log and the sent log is lower than a preset confidence probability threshold.

[0018] To achieve the above-mentioned purpose, the second embodiment of the present invention proposes a method for identifying household-transformer relationship, which includes: when receiving a household-transformer relationship identification instruction, performing analog-to-digital conversion on an analog voltage signal to obtain a digital voltage signal, wherein the analog voltage signal is obtained by converting the current signal on the secondary side of the transformer, and the current signal includes a characteristic current signal carrying characteristic information output by the electric energy meter when receiving the household-transformer relationship identification instruction; obtaining the background noise power value of the frequency point corresponding to the characteristic current signal according to the digital voltage signal; obtaining the effective signal judgment threshold according to the background noise power value; and obtaining the characteristic information according to the digital voltage signal and the effective signal judgment threshold to perform household-transformer relationship identification.

[0019] According to the household-transformer relationship identification method of an embodiment of the present invention, when a household-transformer relationship identification instruction is received, an analog-to-digital conversion is performed on an analog voltage signal to obtain a digital voltage signal. The analog voltage signal is obtained by converting a current signal on the secondary side of the transformer. The current signal includes a characteristic current signal carrying characteristic information output by the electric energy meter when the household-transformer relationship identification instruction is received. Then, a background noise power value of a frequency point corresponding to the characteristic current signal is obtained based on the digital voltage signal, and a valid signal judgment threshold is obtained based on the background noise power value. In addition, characteristic information is obtained based on the digital voltage signal and the valid signal judgment threshold to perform household-transformer relationship identification, thereby realizing real-time and accurate identification of household-transformer relationships without affecting the user's electricity consumption.

[0020] According to one embodiment of the present invention, characteristic information is obtained based on a digital voltage signal and a valid signal decision threshold, including: when a preset number of digital voltage signals whose power values are continuously obtained to be greater than the valid signal decision threshold, starting to obtain the starting byte of the characteristic information based on the digital voltage signal, and obtaining the remaining bytes of the characteristic information based on the digital voltage signal when it is determined that the starting byte is correct.

[0021] According to one embodiment of the present invention, the method further includes: updating the noise floor power value according to the digital voltage signal when the power values of the preset number of digital voltage signals are not continuously obtained to be greater than the valid signal judgment threshold, or when the starting byte is determined to be erroneous.

[0022] According to one embodiment of the present invention, after obtaining the characteristic information, the method also includes: generating a receiving log, the receiving log including the receiving time of the characteristic current signal, the corresponding power value and phase, the background noise power value, the receiving code value, the receiving bit error rate and at least one of the historical household change relationship identification results; receiving the sending log of the electric energy meter; determining the household change relationship of the electric energy meter based on the sending log and the receiving log.

[0023] According to one embodiment of the present invention, the method also includes: when it is determined based on the received log that the signal quality of the characteristic current signal is lower than a preset quality threshold, determining the household change relationship of the electric energy meter based on the household change relationship identification results of the adjacent electric energy meters of the electric energy meter; when it is determined based on the received log and the sent log that the confidence probability of the household change relationship identification result of the electric energy meter is lower than the preset confidence probability threshold, re-determining the household change relationship of the electric energy meter.

[0024] To achieve the above-mentioned purpose, a third embodiment of the present invention proposes a computer-readable storage medium on which a household change relationship identification program is stored. When the household change relationship identification program is executed by a processor, the household change relationship identification method mentioned above is implemented.

[0025] According to the computer-readable storage medium of the embodiment of the present invention, based on the aforementioned household change relationship identification method, it is possible to achieve real-time and accurate identification of household change relationships without affecting the user's electricity consumption.

[0026] To achieve the above-mentioned purpose, the fourth embodiment of the present invention proposes a household change relationship identification terminal, including: a memory, a processor, and a household change relationship identification program stored in the memory and runnable on the processor. When the processor executes the program, the aforementioned household change relationship identification method is implemented.

[0027] The household change relationship identification terminal according to the embodiment of the present invention, based on the aforementioned household change relationship identification method, can realize real-time and accurate identification of household change relationships without affecting the user's electricity consumption.

[0028] To achieve the above-mentioned purpose, the fifth embodiment of the present invention proposes a transformer substation topology structure identification system, which includes: the aforementioned multiple household-transformer relationship identification devices, which are respectively arranged at each power line branch in the transformer substation, and the multiple household-transformer relationship identification devices are used to determine the electric energy meter on each power line branch, and the topology structure of the transformer substation is determined based on the electric energy meter on each power line branch.

[0029] According to the transformer substation topology structure identification system of an embodiment of the present invention, the aforementioned multiple household-to-transformer relationship identification devices are respectively set at each power line branch in the transformer substation, the multiple household-to-transformer relationship identification devices are used to determine the electric energy meter on each power line branch, and the topology structure of the transformer substation is determined based on the electric energy meter on each power line branch. This can achieve real-time and accurate identification of household-to-transformer relationships without affecting user electricity consumption, thereby achieving accurate acquisition of the topology structure.

[0030] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 2. It is a structural diagram of a household change relationship identification device according to an embodiment of the present invention;

[0032] Figure 2 2. It is a schematic diagram of an application of a household change relationship identification device according to an embodiment of the present invention;

[0033] Figure 3 is a waveform diagram of a characteristic current signal according to an embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of an application of a household change relationship identification device according to another embodiment of the present invention;

[0035] Figure 5 is a frequency domain diagram of a characteristic current signal according to an embodiment of the present invention;

[0036] Figure 6 2. It is a structural diagram of a household change relationship identification device according to another embodiment of the present invention;

[0037] Figure 7 2 is a schematic structural diagram of a current transformer interface circuit according to an embodiment of the present invention;

[0038] Figure 8 is a structural diagram of an analog signal processing circuit according to an embodiment of the present invention;

[0039] Figure 9 is a frequency domain diagram of a single-ended voltage signal after bandpass filtering according to one embodiment of the present invention;

[0040] Figure 10 is a frequency domain diagram of a single-ended voltage signal after harmonic filtering according to an embodiment of the present invention;

[0041] Figure 11 is a schematic diagram of decoded data under an ideal state according to one embodiment of the present invention;

[0042] Figure 12 This is a flow chart of analyzing a characteristic current signal to obtain characteristic information according to one embodiment of the present invention;

[0043] Figure 13 2. A flowchart of a household change relationship identification method according to an embodiment of the present invention;

[0044] Figure 14 1 is a schematic diagram of a transformer substation topology identification system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following describes embodiments of the present invention in detail, 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 are not to be construed as limiting the present invention.

[0046] Figure 1 FIG. 1 is a schematic diagram of a household change relationship identification device according to an embodiment of the present invention, referring to FIG. Figure 1 As shown, the household change relationship identification device 100 may include: a current acquisition module 110 , a first communication module 120 and a control module 130 .

[0047] Among them, the current acquisition module 110 is used to convert the current signal on the secondary side of the transformer into an analog voltage signal, and the current signal includes a characteristic current signal carrying characteristic information output by the electric energy meter when it receives the household transformer relationship identification instruction; the first communication module 120 is used to receive the household transformer relationship identification instruction; the current acquisition module 110 and the first communication module 120 are respectively connected to the control module 130, and the control module 130 is used to perform analog-to-digital conversion on the analog voltage signal to obtain a digital voltage signal when receiving the household transformer relationship identification instruction, obtain the background noise power value of the frequency point corresponding to the characteristic current signal according to the digital voltage signal, and obtain the effective signal judgment threshold according to the background noise power value, and obtain characteristic information according to the digital voltage signal and the effective signal judgment threshold to perform household transformer relationship identification.

[0048] Specifically, refer to Figure 2As shown, a current transformer can be set on the secondary side of the transformer (i.e., the outgoing line side) of the transformer station area that needs to be identified, and the current signal on the secondary side of the transformer is obtained through the current transformer. Optionally, the current transformer is an external current transformer, so that the current signal on the power line on the secondary side of the transformer can be obtained without breaking the line for installation, which is convenient for construction. The current acquisition module 110 is connected to the current transformer, and the current signal on the secondary side of the transformer is converted into an analog voltage signal by the current acquisition module 110 and output to the control module 130, wherein the current signal includes a characteristic current signal output by the electric energy meter when receiving the household-to-transformer relationship identification instruction, and the characteristic current signal carries characteristic information of the electric energy meter, and the characteristic information is custom information, which is not specifically limited here.

[0049] The first communication module 120 can be a standard electric energy meter communication module, such as an HPLC high-speed power carrier communication module or a micro-power wireless communication module, etc., which is used to realize uplink communication of the local communication network, such as communicating with the concentrator in the transformer substation to receive the household-transformer relationship identification instruction sent by the concentrator, and send the received household-transformer relationship identification instruction to the control module 130, and report the household-transformer relationship identification result obtained by the control module 130 to the concentrator, etc.

[0050] The control module 130 can use a microprocessor MCU with a built-in multi-channel ADC analog-to-digital conversion interface. The analog-to-digital conversion of each channel can be performed single, continuous, scanning or intermittently. It is used to collect and process the analog voltage signal output by the current acquisition module 110 to parse the characteristic information carried by the characteristic current signal sent by the electric energy meter in the current signal to realize the identification of the household-to-electricity relationship. It should be noted that under ideal circumstances, the characteristic current signal sent by the electric energy meter is as follows: Figure 3 As shown, the electric energy meter can specifically control the MOS load to perform constant resistance or constant current load modulation to obtain the desired characteristic information by superimposing a characteristic current signal with a frequency of 833.3 Hz on the basis of the industrial frequency current signal, and modulating the characteristic current signal to transmit the required characteristic information to the household transformer relationship identification device 100. Among them, after the characteristic current signal of 833.3 Hz is cross-modulated with the industrial frequency current signal of 50 Hz, the frequency domain peak value of its effective signal is 783.3 Hz and 883.3 Hz, so the corresponding frequency points of the characteristic current signal include two frequency points of 783.3 Hz and 883.3 Hz. Due to the complex field environment, the background noise signals corresponding to the two frequency points of 783.3 Hz and 883.3 Hz will be greatly different in different environments. Therefore, before receiving the characteristic current signal, the control module 130 continuously collects the background noise signal to set the effective signal judgment threshold for determining whether the signal is valid, and then determines the characteristic information carried by the characteristic current signal according to the set effective signal judgment threshold to achieve accurate identification of household transformer relationships.

[0051] Specifically, when the electric energy meter does not send a characteristic current signal, the control module 130 can sample the analog voltage signal to obtain a digital voltage signal, and calculate the background noise power value of the frequency point corresponding to the characteristic current signal based on the power value of the digital voltage signal, and add a preset threshold value on the basis of the background noise power value to obtain the effective signal judgment threshold, and then obtain the characteristic information carried by the characteristic current signal based on the effective signal judgment threshold. For example, assuming that five digital voltage signals have been received, the noise floor power value PN(i) of the frequency point corresponding to the characteristic current signal is calculated by performing statistical integration or averaging on the power values of the five digital voltage signals. Then, a preset threshold is added to the noise floor power value PN(i) to obtain the valid signal judgment threshold PT(i). Then, the sixth digital voltage signal is received. When the sixth digital voltage signal is received, it is determined whether the power value of the sixth digital voltage signal is greater than the valid signal judgment threshold PT(i). If so, it means that the digital voltage signal is valid, and the digital voltage signal is retained. The noise floor power value PN(i) of the frequency point corresponding to the characteristic current signal is updated according to the power value of the digital voltage signal, and the valid signal judgment threshold PT(i) is updated. Then, the seventh digital voltage signal is received. If the power values of multiple consecutive digital voltage signals are greater than the corresponding valid signal judgment threshold PT(i), it means that the electric energy meter has sent the characteristic current signal. At this time, the characteristic information carried by the characteristic current signal is obtained based on the digital voltage signal. Among them, when the characteristic information carried by the characteristic current signal is obtained, it can be determined that the electric energy meter is in the current transformer area. At the same time, the phase of the electric energy meter can be determined according to the phase of the characteristic current signal corresponding to the characteristic information. When the characteristic information is not obtained, it can be determined that the electric energy meter is not in the current transformer area, thereby realizing real-time and accurate identification of the household-transformer relationship without interrupting power supply or affecting the user's electricity consumption.

[0052] Further, as a specific application example, refer to Figure 4As shown, since the transformer outputs a three-phase voltage and the electric energy meter uses a single-phase voltage, each electric energy meter will be in one of the three phases of the transformer, that is, the phase where the electric energy meter is located is phase A, phase B or phase C. When using the household transformer relationship identification device 100 of the present invention to perform household transformer relationship identification, a three-channel current transformer can be set on the secondary side of the transformer to obtain the current signal of each phase on the secondary side of the transformer through the three-channel current transformer. When household transformer relationship identification is required, for example, when a new substation file is added or a substation file is changed, household transformer relationship identification is performed. At this time, the management master station can send a start instruction to the concentrator in the transformer substation. After receiving the start instruction, the concentrator can send an instruction to start household transformer relationship identification to the electric energy meter that needs to perform household transformer relationship identification through the local communication network, and at the same time notify the household transformer relationship identification device 100 of the relevant information of the electric energy meter currently starting household transformer relationship identification through the local communication network.

[0053] After receiving the household-to-transformer relationship identification instruction, the electric energy meter sends a modulated characteristic current signal carrying specific data information (i.e., characteristic information) to the power line between the electric energy meter and the secondary side of the transformer through the built-in characteristic current sending circuit. Due to the transmission characteristics of the current, only the power supply side corresponding to the load end can receive the characteristic current signal sent by the load end. If the transformer substation to which the electric energy meter belongs is correct at this time, the household-to-transformer relationship identification device 100 installed on the secondary side of the transformer will receive the characteristic current signal sent by the electric energy meter, demodulate the characteristic information it carries, and be able to confirm the phase of the characteristic current signal, thereby determining the phase of the electric energy meter. Furthermore, the household-to-transformer relationship identification device 100 can also store the obtained characteristic information, the phase of the characteristic current signal, and the relevant information of the electric energy meter sent by the concentrator in an internal database. At the same time, the time, phase, and characteristic information of the received characteristic current signal can be sent to the concentrator. At this point, a correct household-to-transformer relationship identification is completed, and the transformer substation and phase relationship to which the electric energy meter belongs are determined. If the household-to-transformer relationship identification device 100 fails to receive the characteristic current signal sent by the electric energy meter within the preset time, the concentrator is notified to retry and restart the household-to-transformer relationship identification of the electric energy meter. If the characteristic current signal sent by the electric energy meter is still not successfully received after the preset number of times, it is determined that the electric energy meter does not belong to the current transformer area and the identification is terminated.

[0054] The concentrator starts the household-transformer relationship identification of all the electric energy meters in the substation file in turn to determine whether the transformer substation to which each electric energy meter belongs in the current substation file is consistent with the actual household-transformer relationship, and whether the phases of each electric energy meter are consistent.

[0055] In the above embodiment, household change relationships are identified based on characteristic current signals, and when identifying household change relationships, an effective signal decision threshold is obtained based on the background noise power value, thereby enabling real-time and accurate identification of household change relationships without interrupting power supply or affecting user electricity consumption.

[0056] It should be noted that after cross-modulating the 833.3 Hz characteristic current signal with the 50 Hz power frequency current signal, the corresponding frequency domain characteristics are as follows: Figure 5 As shown, from Figure 5 It can be seen that the intensity of the 50Hz power frequency current signal and its harmonic current signal is strong, while the intensity of the characteristic current signal is weak. In the case of 100A power frequency current, the spectrum after the normal 100A power frequency current and the 0.6A characteristic current are superimposed is as follows Figure 5 As shown in the upper curve, the characteristic current spectrum is as follows Figure 5 As shown in the curve below, the energy difference between the 50Hz power frequency current signal and the characteristic current signal is 50dB. Therefore, the weaker characteristic current signal needs to be separated and processed from the original current signal to demodulate the characteristic information carried by the characteristic current signal.

[0057] In some embodiments, reference Figure 6 As shown, the current acquisition module 110 includes: a current transformer interface circuit 111 and an analog signal processing circuit 112, wherein the current transformer interface circuit 111 is connected to the current transformer on the secondary side of the transformer, and is used to convert the current signal into a differential voltage signal and perform low-frequency filtering processing; the analog signal processing circuit 112 is connected to the current transformer interface circuit 111, and is used to perform differential amplification processing, bandpass filtering processing, harmonic filtering processing and analog amplification processing on the differential voltage signal after low-frequency filtering processing in sequence to obtain an analog voltage signal.

[0058] For further reference, Figure 7 As shown, the current transformer interface circuit 111 includes: a sampling circuit 1111 and a high-pass filter circuit 1112, wherein the sampling circuit 1111 is connected to the current transformer and is used to convert the current signal into a differential voltage signal; the high-pass filter circuit 1112 is connected to the sampling circuit 1111 and is used to perform low-frequency filtering on the differential voltage signal through a dynamic tracking filter network to filter out strong low-frequency signals.

[0059] For further reference, Figure 8As shown, the analog signal processing circuit 112 includes: a differential amplifier single-ended conversion circuit 1121, an active bandpass filter circuit 1122, a hardware notch filter circuit 1123, and a PGA (Programmable Gain Amplifier) amplifier circuit 1124. The differential amplifier single-ended conversion circuit 1121 is connected to the current transformer interface circuit 111, and is used to perform differential amplification on the differential voltage signal after low-frequency filtering and convert it into a single-ended voltage signal; the active bandpass filter circuit 1122 is connected to the differential amplifier single-ended conversion circuit 1121, and is used to perform bandpass filtering on the single-ended voltage signal. For example, the passband of the active bandpass filter circuit 1122 is 750Hz to 900Hz, so that the single-ended voltage signal after bandpass filtering retains the effective signal spectrum components of 783.3Hz and 883.3Hz. Its waveform diagram is shown as follows: Figure 9 As shown, from Figure 9 It can be seen that the signal outside the passband is weakened, and the frequency band containing the frequency point corresponding to the characteristic current signal, that is, the frequency band of the effective signal frequency point, is retained, thereby effectively improving the reliability and success rate of household-to-substation relationship identification; the hardware notch filter circuit 1123 is connected to the active bandpass filter circuit 1122, and is used to perform harmonic filtering on the single-ended voltage signal after bandpass filtering to filter out the integer multiple high-order harmonics of the power frequency current, for example, filtering out the 15th, 16th, 17th and 18th high-order harmonics of the power frequency current. The signal waveform after filtering is as follows: Figure 10 As shown; the PGA amplifier circuit 1124 is connected to the hardware trap circuit 1123, and is used to perform analog amplification processing on the single-ended voltage signal after harmonic filtering to obtain an analog voltage signal.

[0060] In some embodiments, the control module 130 is further configured to adjust the amplification factor of the PGA amplifier circuit 1124 according to the background noise power value to improve the dynamic range of signal reception and prevent saturation distortion of the analog voltage signal, thereby causing sampling distortion.

[0061] Specifically, the control module 130 adjusts the amplification factor of the PGA amplifier circuit 1124 based on the digital voltage signal after noise floor quantization, ensuring that the amplification factor of the PGA amplifier circuit 1124 is set to an appropriate parameter. This is achieved by statistically averaging the raw digital output values of the ADC in the noise floor acquisition state. The control module 130 dynamically adjusts the PGA parameters based on the raw digital output values of the ADC in the current noise floor acquisition state, ensuring that the raw digital output values of the ADC in this state remain at approximately one-quarter of the ADC's full-scale output, thereby preventing saturation distortion in the sampled signal.

[0062] In some embodiments, reference Figure 6As shown, the household transformer relationship identification device 100 further includes: a zero-crossing detection circuit 140 for detecting the actual power frequency current frequency; the control module 130 is further used to obtain the corresponding frequency point of the harmonic current signal according to the actual power frequency current frequency, and set the notch point parameters of the hardware notch filter circuit 1123 according to the corresponding frequency point of the harmonic current signal.

[0063] Specifically, since the frequency of the industrial frequency current is not necessarily exactly 50Hz in actual circumstances, its higher harmonic frequencies will also change accordingly. Therefore, the actual industrial frequency current frequency can be obtained through the zero-crossing detection circuit 140, and the higher harmonic frequencies can be dynamically calculated based on the industrial frequency current frequency. The notch point parameters of the hardware notch filter circuit 1123 can be configured in real time based on the higher harmonic frequencies to achieve accurate analog notching, so as to weaken the harmonic current signal within the passband. The specific frequencies are the 15th, 16th, 17th and 18th higher harmonic signals of the industrial frequency current signal between 750Hz and 900Hz, thereby improving the signal-to-noise ratio of the characteristic current signal and facilitating subsequent processing. As a specific example, the hardware notch filter circuit 1123 can be implemented using the principle of switched capacitor filtering, for example, using a MAX262 chip. The MAX262 is a universal switched capacitor filter programmable by a microprocessor. Its filter parameters f0 (center or inflection frequency), Q value, and MODE (mode) can all be programmed by the microprocessor. The hardware notch filter circuit 1123 can be constructed without external components. The control module 130 can set the MAX262 chip to operate in notch mode using MODE. The filter parameters f0 and Q value are then set based on the acquired high-order harmonic signal, thereby filtering out the high-order harmonic signal through the MAX262 chip. In this embodiment, because the notch point of the hardware notch filter circuit 1123 is obtained based on the actual power current frequency, it can achieve a better notch effect.

[0064] In other embodiments, when the analog signal processing circuit 112 does not perform harmonic filtering on the single-ended voltage signal after bandpass filtering, the control module 130 is also used to set the notch point parameters of the digital notch filter according to the corresponding frequency point of the harmonic current signal, so as to perform harmonic filtering on the digital voltage signal through the digital notch filter.

[0065] That is to say, the high-order harmonic signals within the passband can also be filtered out by digital filtering. In this case, the analog signal processing circuit 112 may not include the hardware notch filter circuit 1123. Specifically, after the control module 130 performs analog-to-digital conversion on the analog voltage signal to obtain a digital voltage signal, it can obtain the actual power frequency current frequency through the zero-crossing detection circuit 140, dynamically calculate the high-order harmonic frequency point based on the power frequency current frequency, and set the notch point of the digital notch filter based on the high-order harmonic frequency point, so as to filter out the high-order harmonic signals in the digital voltage signal through the digital notch filter. For example, the actual power frequency current frequency obtained is F AC, the secondary frequency is the basic frequency of the power frequency, and then the frequency point that needs digital notching is calculated as: 15×F AC 、16×F AC 、17×F AC 、18×F AC The transfer function of the digital notch filter is configured according to these frequency points to weaken the high-order harmonic signals contained in the sampled digital voltage signal sequence. In this embodiment, since the notch points of the digital notch filter are obtained based on the actual power frequency current frequency, a better notch effect can be achieved.

[0066] In the above embodiment, by dynamically adjusting the notch point of the hardware notch filter circuit or the digital notch filter according to the actual power frequency current frequency, the high-order harmonic signals of the power frequency current in the passband can be effectively filtered out, the signal-to-noise ratio of the characteristic current signal is improved, and the characteristic current signal is separated from the original current signal; at the same time, the amplification factor of the PGA amplifier circuit is dynamically adjusted according to the background noise power value, and dynamic control is used to prevent the saturation distortion of the analog current signal, which is beneficial to improving the accuracy of household transformer relationship identification; at the same time, the passband after harmonic filtering includes two frequency points of 873.3Hz and 883.3Hz corresponding to the characteristic current signal. When identifying the household transformer relationship, these two frequency points can be simultaneously detected and comprehensively judged to further improve the accuracy of identification. When an interference signal appears at any frequency point, it does not affect the overall reception of the signal, which can improve the decoding accuracy, that is, it has multi-frequency point reception and processing capabilities to prevent interference at a single frequency point and cause identification failure.

[0067] After the current acquisition module 110 processes the current signal to obtain an analog voltage signal, the control module 130 samples the analog voltage signal to obtain a digital voltage signal, and performs household change relationship recognition based on the digital voltage signal.

[0068] In some embodiments, the control module 130 is specifically configured to begin acquiring the starting byte of the characteristic information based on the digital voltage signal when the power values of the digital voltage signal obtained continuously for a preset number of times are greater than the valid signal determination threshold, and to acquire the remaining bytes of the characteristic information based on the digital voltage signal when the starting byte is determined to be correct. Furthermore, the control module 130 is further configured to update the noise floor power value based on the digital voltage signal when the power values of the digital voltage signal obtained continuously for a preset number of times are greater than the valid signal determination threshold, or when the starting byte is determined to be incorrect.

[0069] For example, the control module 130 can sample the analog voltage signal output by the current acquisition module 110 through the built-in multi-channel ADC analog-to-digital conversion interface to obtain a digital voltage signal. To balance data processing speed and sampling waveform accuracy, the sampling frequency can be set to 6kHz. Using DMA (Direct Memory Access), the three channel ADC analog-to-digital conversion interfaces are controlled in turn to store the sampled data stream into a specified memory area. Each channel collects 720 points of a single sample with a length of 120ms, which is decoded as a data symbol (i.e., a digital voltage signal). Each bit of data takes 600ms, i.e., 5 data symbols. Next, the control module 130 performs an FFT (Fast Fourier Transform) operation on the collected data symbols, obtains the discrete Fourier transform result to extract the frequency domain information of the signal, obtains the power value of the corresponding frequency point of the characteristic current signal, combines the background noise signal data of the corresponding frequency point of the characteristic current signal for comprehensive judgment, and uses a certain demodulation algorithm to analyze the characteristic information carried by the characteristic current signal.

[0070] For example, assume that the effective data transmitted by an energy meter at a time consists of 16 binary bits plus redundant bits for error correction. Each bit occupies 600ms. OOK modulation is used, with the presence or absence of the characteristic current signal representing a "1" or "0" bit, and the starting byte is a fixed synchronization byte. For the effective data of 0xAA and 0xE9, the corresponding binary encoding is: 1-0-1-0-1-0-1-0-1-1-1-0-1-0-0-1. The redundant bits for error correction are generated using RS encoding (Reeds-Solomon code), which can correct a single error bit. Due to the complex field environment, the background noise signal of the frequency point corresponding to the characteristic current signal will vary greatly in different environments. Therefore, before receiving the characteristic current signal, the control module 130 continuously collects the background noise signal to set the valid signal judgment threshold for determining whether the signal is valid. The control module 130 maintains a decoding sequence with a capacity of 5 in each channel. After each data symbol is received, a new data symbol is inserted to the end of the decoding sequence, and the earliest data symbol is removed. When the power value of the data symbol is greater than the valid signal judgment threshold, the data symbol is considered valid, and a "1" is written to the end of the decoding sequence. When the power value of the data symbol is less than or equal to the valid signal judgment threshold, the data symbol is considered invalid, and a "0" is written to the end of the decoding sequence. When the five consecutively detected data symbols are all "1", it is considered that a valid bit "1" has been received. At this time, the bit synchronization is valid, and it is ready to start receiving valid data, and the updating of the background noise power value is suspended. After the bit synchronization is effective, the control module 130 can decode the remaining bits according to the bit time of 600ms, and determine the bits represented by each group of 5 data symbols. First, the first byte is received. Since the first starting byte is fixed to 0xAA, if the received byte is consistent with the starting byte, it is considered that the reception is valid, and the byte synchronization flag is set. The remaining bits are decoded until the decoding of 16 bits and redundant bits is completed, and the reception completion flag is set. Subsequent data processing is performed, and the bit synchronization flag is cleared at the same time, and the background noise power value is restored. If there is an error bit after verification, the redundant bit is used for error correction to obtain the correct 16-bit bit data. Under ideal conditions, the decoded data received is as follows: Figure 11 As shown (the error correction bits are not shown in the figure).

[0071] For further reference, Figure 12 As shown, when the control module 130 obtains the characteristic information carried by the characteristic current signal according to the digital voltage signal, the following steps may be included:

[0072] In step S101 , an analog voltage signal is collected to obtain a digital voltage signal, and an FFT operation is performed on the digital voltage signal to obtain a power value of the digital voltage signal.

[0073] Step S102: Determine whether a valid bit is received based on the power value of the digital voltage signal and the valid signal determination threshold. If a valid bit is received, execute step S103; otherwise, execute step S108.

[0074] Step S103: bit synchronization is valid, and the start byte is received according to the time stamp.

[0075] Step S104: Determine whether the starting byte is correct. If the starting byte is correct, proceed to step S105; otherwise, proceed to step S107.

[0076] Step S105: Byte synchronization is valid, and the remaining bytes are received.

[0077] Step S106: Valid data reception is completed, that is, feature information reception is completed.

[0078] Step S107: The received data is invalid.

[0079] Step S108, entering the background noise monitoring state, calculating and updating the background noise data, and then updating the effective signal decision threshold, and at the same time, updating the amplification factor of the PGA amplifier circuit.

[0080] In the above embodiment, by adopting the FFT method to extract the signal frequency domain information, and parsing the effective data, i.e., characteristic information, through the OOK demodulation algorithm, and dynamically determining the effective signal judgment threshold required by the OOK demodulation algorithm based on the background noise signal, the characteristic information carried by the characteristic current signal can be accurately parsed from the original current signal, effectively coping with the influence of time-varying noise on the power line; at the same time, the effective data adopts RS encoding, carries redundant information, and has automatic error correction capability. The error correction algorithm can correct sudden bit errors, further increasing the accuracy of recognition.

[0081] In some embodiments, the control module 130 is also used to generate a receiving log after obtaining the characteristic information, and receive the sending log of the electric energy meter, and determine the household change relationship of the electric energy meter based on the sending log and the receiving log, wherein the receiving log includes the receiving time of the characteristic current signal, the corresponding power value and phase, the background noise power value, the receiving code value, the receiving bit error rate and at least one of the historical household change relationship identification results.

[0082] Specifically, after the control module 130 parses the characteristic information carried by the characteristic current signal sent by the electric energy meter from the original current signal, it can determine that the electric energy meter is in the current transformer station area. At the same time, the phase of the electric energy meter can be determined based on the phase of the characteristic current signal. In addition, the reception time of the characteristic current signal and other information can be determined, thereby forming a reception log and storing it. For example, the reception log is shown in Table 1:

[0083] Table 1

[0084]

[0085] Among them, the data items affect the confidence probability of the household-to-transformer relationship recognition results as follows: Receiving time: the greater the time difference between the receiving time of the characteristic current signal and the sending time of the characteristic current signal by the electric energy meter, the lower the confidence probability of the recognition result; Phase: the phase where the characteristic current signal is received is consistent with the phase obtained by active recognition of the electric energy meter, and the confidence probability of the recognition result increases; Background noise signal strength, that is, background noise power value: the higher the background noise signal strength, the lower the confidence probability of the recognition result; Characteristic current signal strength, that is, the power value of the characteristic current signal: the higher the characteristic current signal strength, the higher the confidence probability of the recognition result; Bit error rate: the higher the bit error rate, the lower the confidence probability of the recognition result; Historical recognition results: the more times the historical recognition results are the same, the higher the confidence probability of the recognition result.

[0086] The foregoing analysis indicates that the confidence probability of the identification result is not only related to some of the data items in Table 1, but also to some information about the electric energy meter. Therefore, after obtaining the receiving log, the control module 130 can also synchronously obtain the electric energy meter's sending log via the local communication network, including the time and content of the characteristic current signal. By comparing the sending log with the receiving log, further identification of the household-to-household relationship can be completed, thereby further improving the accuracy of household-to-household relationship identification. For example, although the control module 130 has parsed and obtained characteristic information from the characteristic current signal, if the difference in reception time is too large based on the sending log and the receiving log, the confidence probability of the identification result is determined to be low, and household-to-household relationship identification is then repeated. For another example, if the phase of the received characteristic current signal is inconsistent with the result of the electric energy meter's automatic identification in the sending log, household-to-household relationship identification is repeated. For another example, if the reception bit error rate is high, household-to-household relationship identification is repeated.

[0087] In some embodiments, the control module 130 is further configured to redetermine the household change relationship of the electric energy meter when the confidence probability of the household change relationship identification result of the electric energy meter determined according to the receiving log and the sending log is lower than a preset confidence probability threshold.

[0088] Specifically, the data items in Table 1 can be comprehensively considered to determine the final recognition result to ensure the reliability of the recognition. For example, the control module 130 can obtain the receiving time, phase, background noise signal strength, characteristic current signal strength, receiving bit error rate and historical recognition result weights in Table 1, and calculate the confidence probability of the recognition result based on the weight. Based on the calculated confidence probability, it is determined whether it is necessary to re-perform household change relationship recognition to ensure the reliability of the recognition.

[0089] In some embodiments, the control module 130 is further configured to determine the household change relationship of the electric energy meter based on household change relationship identification results of adjacent electric energy meters when it is determined based on the received log that the signal quality of the characteristic current signal is lower than a preset quality threshold.

[0090] Specifically, the control module 130 may also include a fuzzy statistical recognition function, enabling statistical recognition even when signal quality is poor, thereby improving the final recognition success rate. For example, the control module 130 first compares the sending log and the receiving log, and updates the electricity meters whose household-to-household relationship can be clearly identified to the household-to-household relationship recognition result record. Simultaneously, the control module 130 calculates the confidence probability of the identification result for each electricity meter based on the aforementioned method. Then, for received logs with poor signal quality, if the household-to-household relationship recognition result alone cannot complete the household-to-household relationship recognition, the household-to-household relationship of the electricity meter with poor signal quality can be statistically determined by combining the household-to-household relationship and confidence probability of the surrounding identified electricity meters. For example, if the characteristic current signal of the current electricity meter is poor, the household-to-household relationship of adjacent electricity meters at the same communication level under the same proxy node in the communication network can be determined based on the current electricity collection communication network meter database data and the confirmed household-to-household relationship recognition results. At this time, the current electricity meter recognition result can be weighted based on the household-to-household relationship results of adjacent electricity meters at the same communication level under the proxy node. For example, for a certain electric energy meter A, its characteristic current identification results show that it has a 50% confidence probability of belonging to transformer E substation or transformer F substation, and its adjacent electric energy meters B, C, and D all have a confidence probability of more than 90% and the confidence probability results show that B, C, and D are all electric energy meters under transformer E substation. Then, based on the data of the adjacent electric energy meters, the weight of the result of the single identification result of electric energy meter A being transformer E substation is increased, and the weight of the result of the single identification result of electric energy meter A being transformer F substation is reduced. Multiple identification statistics are performed to obtain the final household-transformer relationship identification result of electric energy meter A.

[0091] As a specific example, the control module 130 can first calculate the confidence probability of each electric energy meter based on the received and sent logs, and determine whether the confidence probability is greater than a preset confidence probability threshold (e.g., 90%). If so, the current identification result is determined to be the household-to-transformer relationship identification result for the corresponding electric energy meter and recorded in the household-to-transformer relationship identification result record. If the confidence probability is less than or equal to the preset confidence probability threshold, the household-to-transformer relationship identification is repeated. During this process, if the signal quality of the electric energy meter is poor, that is, the signal quality of the characteristic current signal is lower than the preset quality threshold, the household-to-transformer relationship of the electric energy meter is statistically obtained based on the household-to-transformer relationship identification results of the already identified electric energy meters. The signal quality of the characteristic current signal can be determined by the characteristic current signal strength and the received bit error rate. It should be noted that when the preset confidence probability threshold is set to 90%, the confidence probability of the identification result of each electric energy meter ultimately obtained based on this method will reach above 90%. At this point, the identification of the entire transformer substation is completed, and a reliable identification result is output, ensuring the reliability of the identification result.

[0092] In the above embodiment, the reliability of the overall recognition result can be improved by using the fuzzy recognition function.

[0093] It should be noted that the household change relationship identification device 100 may also have other modules or circuits.

[0094] In some embodiments, reference Figure 6 As shown, the household change relationship identification device 100 further includes a second communication module 150 for communicating with an external device to manage and configure the household change relationship identification device 100 and to transmit household change relationship identification results to the external device. Optionally, the second communication module 150 may be an RS485 communication interface, etc.

[0095] Continue to refer Figure 6 As shown, the household change relationship identification device 100 further includes: a display module 160 for displaying the household change relationship identification result for the convenience of operation and maintenance personnel. Optionally, the display module 160 can be an LCD liquid crystal display screen or the like.

[0096] Continue to refer Figure 6 As shown, the household change relationship identification device 100 further includes: a power management circuit 170 for providing working power to various circuit parts inside the household change relationship identification device 100.

[0097] In summary, according to the household-transformer relationship identification device of an embodiment of the present invention, the current acquisition module converts the current signal on the secondary side of the transformer into an analog voltage signal, and the current signal includes a characteristic current signal carrying characteristic information output by the electric energy meter when receiving the household-transformer relationship identification instruction. When the control module receives the household-transformer relationship identification instruction, the analog voltage signal is converted into a digital signal to obtain a digital voltage signal, and the background noise power value of the frequency point corresponding to the characteristic current signal is obtained according to the digital voltage signal, and the effective signal judgment threshold is obtained according to the background noise power value, and the characteristic information is obtained according to the digital voltage signal and the effective signal judgment threshold to perform household-transformer relationship identification, thereby realizing real-time and accurate identification of household-transformer relationships without affecting the user's electricity consumption.

[0098] Figure 13 This is a flowchart of a household change relationship identification method according to an embodiment of the present invention, referring to Figure 13 As shown, the household change relationship identification method may include the following steps:

[0099] Step S201: After receiving the household-transformer relationship identification instruction, perform analog-to-digital conversion on the analog voltage signal to obtain a digital voltage signal, wherein the analog voltage signal is obtained by converting the current signal on the secondary side of the transformer, and the current signal includes a characteristic current signal carrying characteristic information output by the electric energy meter when receiving the household-transformer relationship identification instruction.

[0100] Step S202 : obtaining a noise floor power value of a frequency point corresponding to the characteristic current signal according to the digital voltage signal.

[0101] Step S203: Obtain a valid signal decision threshold according to the background noise power value.

[0102] Step S204 : acquiring characteristic information according to the digital voltage signal and the effective signal determination threshold to identify household change relationships.

[0103] In some embodiments, characteristic information is obtained based on a digital voltage signal and a valid signal judgment threshold, including: when the power values of a preset number of digital voltage signals obtained continuously are greater than the valid signal judgment threshold, starting to obtain the starting byte of the characteristic information based on the digital voltage signal, and obtaining the remaining bytes of the characteristic information based on the digital voltage signal when it is determined that the starting byte is correct.

[0104] In some embodiments, the method further includes: updating the noise floor power value according to the digital voltage signal when a preset number of digital voltage signals whose power values are not continuously obtained to be greater than the valid signal decision threshold, or when a start byte error is determined.

[0105] In some embodiments, after obtaining the characteristic information, the method also includes: generating a receiving log, the receiving log including the receiving time of the characteristic current signal, the corresponding power value and phase, the background noise power value, the receiving code value, the receiving bit error rate and at least one of the historical household change relationship identification results; receiving the sending log of the electric energy meter; determining the household change relationship of the electric energy meter based on the sending log and the receiving log.

[0106] In some embodiments, the method also includes: when it is determined based on the received log that the signal quality of the characteristic current signal is lower than a preset quality threshold, determining the household change relationship of the electric energy meter based on the household change relationship identification results of the adjacent electric energy meters of the electric energy meter; when it is determined based on the received log and the sent log that the confidence probability of the household change relationship identification result of the electric energy meter is lower than a preset confidence probability threshold, re-determining the household change relationship of the electric energy meter.

[0107] It should be noted that, for the description of the household change relationship identification method, please refer to the description of the household change relationship identification device, and the details will not be repeated here.

[0108] According to the household-transformer relationship identification method of an embodiment of the present invention, when a household-transformer relationship identification instruction is received, an analog-to-digital conversion is performed on an analog voltage signal to obtain a digital voltage signal. The analog voltage signal is obtained by converting a current signal on the secondary side of the transformer. The current signal includes a characteristic current signal carrying characteristic information output by the electric energy meter when the household-transformer relationship identification instruction is received. Then, a background noise power value of a frequency point corresponding to the characteristic current signal is obtained based on the digital voltage signal, and a valid signal judgment threshold is obtained based on the background noise power value. In addition, characteristic information is obtained based on the digital voltage signal and the valid signal judgment threshold to perform household-transformer relationship identification, thereby realizing real-time and accurate identification of household-transformer relationships without affecting the user's electricity consumption.

[0109] In some embodiments, a computer-readable storage medium is further provided, on which a household change relationship identification program is stored. When the household change relationship identification program is executed by a processor, the household change relationship identification method described above is implemented.

[0110] According to the computer-readable storage medium of the embodiment of the present invention, based on the aforementioned household change relationship identification method, it is possible to achieve real-time and accurate identification of household change relationships without affecting the user's electricity consumption.

[0111] In some embodiments, a household change relationship identification terminal is also provided, including: a memory, a processor, and a household change relationship identification program stored in the memory and runnable on the processor. When the processor executes the program, the aforementioned household change relationship identification method is implemented.

[0112] The household change relationship identification terminal according to the embodiment of the present invention, based on the aforementioned household change relationship identification method, can realize real-time and accurate identification of household change relationships without affecting the user's electricity consumption.

[0113] In some embodiments, a transformer area topology identification system is also provided, referring to Figure 14 As shown, the system includes: the aforementioned multiple household-to-transformer relationship identification devices 100, which are respectively arranged at each power line branch in the transformer substation, and the multiple household-to-transformer relationship identification devices 100 are used to determine the electric energy meter on each power line branch, and the topology of the transformer substation is determined according to the electric energy meter on each power line branch.

[0114] Specifically, refer to Figure 14 As shown, the household transformer relationship identification device 100 can be installed at the branch box of each power line branch, and the number of current transformer interface circuits in the household transformer relationship identification device 100, that is, the number of access paths of the current transformer, can be adjusted according to the actual number of branches. After the management master station initiates the identification, the electric energy meter (represented by the black dot in the figure) sends a characteristic current signal to the power line. The household transformer relationship identification device 100 installed at the branch box can confirm the actual branch where the electric energy meter is located through the characteristic current signal identification and send the identification result to the management master station. The master station summarizes all the identification results to obtain the physical path of the characteristic current signal, and then determines the actual physical branch where the electric energy meter is located, realizes the physical topology identification of the transformer substation, and obtains the topological structure of the transformer substation.

[0115] According to the transformer substation topology structure identification system of an embodiment of the present invention, the aforementioned multiple household-to-transformer relationship identification devices are respectively set at each power line branch in the transformer substation, the multiple household-to-transformer relationship identification devices are used to determine the electric energy meter on each power line branch, and the topology structure of the transformer substation is determined based on the electric energy meter on each power line branch. This can achieve real-time and accurate identification of household-to-transformer relationships without affecting user electricity consumption, thereby achieving accurate acquisition of the topology structure.

[0116] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, 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 it in another suitable manner if necessary, and then storing it in a computer memory.

[0117] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0118] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0119] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0120] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0121] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A household change relationship identification device, characterized in that: The device comprises: a current acquisition module, configured to convert a current signal on the secondary side of the transformer into an analog voltage signal, wherein the current signal includes a characteristic current signal carrying characteristic information output by the electric energy meter upon receiving a user-transformer relationship identification instruction; wherein the current signal is acquired by a current transformer provided on the secondary side of the transformer; A first communication module is configured to receive the household change relationship identification instruction; a control module, the current acquisition module and the first communication module are respectively connected to the control module, the control module being configured to, upon receiving the household change relationship identification instruction, perform analog-to-digital conversion on the analog voltage signal to obtain a digital voltage signal, obtain a noise floor power value at a frequency point corresponding to the characteristic current signal based on the digital voltage signal, obtain a valid signal determination threshold based on the noise floor power value, and obtain the characteristic information based on the digital voltage signal and the valid signal determination threshold to perform household change relationship identification; Wherein, obtaining the noise floor power value of the frequency point corresponding to the characteristic current signal according to the digital voltage signal, and obtaining the valid signal judgment threshold according to the noise floor power value, includes: calculating the noise floor power value of the frequency point corresponding to the characteristic current signal according to the power value of the digital voltage signal, and adding a preset threshold value to the noise floor power value to obtain the valid signal judgment threshold; and further includes: before the characteristic current signal is received, continuously collecting the noise floor signal to set the valid signal judgment threshold for determining whether the signal is valid, and updating the noise floor power value according to the digital voltage signal when the power value of the preset number of digital voltage signals is not continuously obtained to be greater than the valid signal judgment threshold, or when it is determined that the starting byte is wrong; When the analog signal processing circuit does not perform harmonic filtering on the single-ended voltage signal after bandpass filtering, the control module is further configured to dynamically calculate a higher harmonic frequency point based on the power frequency current frequency, and set a notch point parameter of the digital notch filter based on the higher harmonic frequency point, so as to perform harmonic filtering on the higher harmonic signal contained in the digital voltage signal through the digital notch filter; the characteristic current signal after harmonic filtering corresponds to two frequency points, and the two frequency points are simultaneously detected and comprehensively judged to perform household change identification; The control module is further configured to generate a receiving log after obtaining the characteristic information, receive a sending log of the electric energy meter, and determine the household change relationship of the electric energy meter based on the sending log and the receiving log, wherein the receiving log includes at least one of the receiving time of the characteristic current signal, the corresponding power value and phase, the noise floor power value, the received code value, the received bit error rate, and a historical household change relationship identification result; The control module is further configured to redetermine the household change relationship of the electric energy meter when the confidence probability of the household change relationship identification result of the electric energy meter is determined to be lower than a preset confidence probability threshold according to the receiving log and the sending log.

2. The household change relationship identification device according to claim 1, characterized in that: The current acquisition module includes: a current transformer interface circuit, connected to the current transformer on the secondary side of the transformer, for converting the current signal into a differential voltage signal and performing low-frequency filtering; An analog signal processing circuit is connected to the current transformer interface circuit and is used to sequentially perform differential amplification processing, bandpass filtering processing, harmonic filtering processing and analog amplification processing on the differential voltage signal after low-frequency filtering processing to obtain the analog voltage signal.

3. The household change relationship identification device according to claim 2, characterized in that: The current transformer interface circuit includes: a sampling circuit, the sampling circuit being connected to the current transformer and configured to convert the current signal into the differential voltage signal; A high-pass filter circuit is connected to the sampling circuit and is used to perform low-frequency filtering on the differential voltage signal through a dynamic tracking filter network.

4. The household change relationship identification device according to claim 2, characterized in that: The analog signal processing circuit includes: A differential amplification single-ended conversion circuit, connected to the current transformer interface circuit, configured to perform differential amplification on the differential voltage signal after low-frequency filtering and convert the differential voltage signal into a single-ended voltage signal; an active bandpass filter circuit, the active bandpass filter circuit being connected to the differential amplification single-ended conversion circuit and configured to perform bandpass filtering on the single-ended voltage signal; a hardware trap circuit, the hardware trap circuit being connected to the active bandpass filter circuit and configured to perform harmonic filtering on the single-ended voltage signal after the bandpass filtering process; The PGA amplifier circuit is connected to the hardware notch filter circuit and is used to perform analog amplification processing on the single-ended voltage signal after harmonic filtering to obtain the analog voltage signal.

5. The household change relationship identification device according to claim 4, characterized in that: The device further comprises: Zero-crossing detection circuit, used to detect the actual power current frequency; The control module is further configured to obtain a frequency point corresponding to a harmonic current signal according to the actual power frequency current frequency, and to set a notch point parameter of the hardware notch filter circuit according to the frequency point corresponding to the harmonic current signal.

6. The household change relationship identification device according to claim 4, characterized in that: The control module is further configured to adjust the amplification factor of the PGA amplifier circuit according to the background noise power value.

7. The household change relationship identification device according to claim 1, characterized in that: The control module is specifically used to start obtaining the starting byte of the characteristic information according to the digital voltage signal when the power value of a preset number of digital voltage signals obtained continuously is greater than the valid signal judgment threshold, and to obtain the remaining bytes of the characteristic information according to the digital voltage signal when it is determined that the starting byte is correct.

8. The household change relationship identification device according to any one of claims 1 to 7, characterized in that: The control module is further configured to determine the household change relationship of the electric energy meter based on household change relationship identification results of adjacent electric energy meters of the electric energy meter when it is determined according to the reception log that the signal quality of the characteristic current signal is lower than a preset quality threshold.

9. A household change relationship identification method, characterized in that: The method comprises: Upon receiving the household-to-transformer relationship identification instruction, performing analog-to-digital conversion on the analog voltage signal to obtain a digital voltage signal, wherein the analog voltage signal is obtained by converting a current signal on the secondary side of the transformer, the current signal including a characteristic current signal carrying characteristic information output by the electric energy meter upon receiving the household-to-transformer relationship identification instruction; wherein the current signal is obtained by a current transformer disposed on the secondary side of the transformer; Acquire a noise floor power value of a frequency point corresponding to the characteristic current signal according to the digital voltage signal; Obtaining a valid signal decision threshold according to the background noise power value; Acquiring the characteristic information according to the digital voltage signal and the effective signal judgment threshold to perform household change relationship identification; Wherein, the obtaining of the noise floor power value of the frequency point corresponding to the characteristic current signal according to the digital voltage signal and the obtaining of the valid signal judgment threshold according to the noise floor power value include: calculating the noise floor power value of the frequency point corresponding to the characteristic current signal according to the power value of the digital voltage signal, and adding a preset threshold value to the noise floor power value to obtain the valid signal judgment threshold; and further include: before the characteristic current signal is received, continuously collecting the noise floor signal to set the valid signal judgment threshold for determining whether the signal is valid, and updating the noise floor power value according to the digital voltage signal when the power value of the preset number of digital voltage signals is not continuously obtained to be greater than the valid signal judgment threshold, or when it is determined that the starting byte is wrong; After obtaining the characteristic information, the method further includes: Generate a receiving log, the receiving log including at least one of the receiving time of the characteristic current signal, the corresponding power value and phase, the noise floor power value, the received code value, the received bit error rate, and the historical user change relationship identification result; receiving a sending log of the electric energy meter; Determining the household change relationship of the electric energy meter according to the sending log and the receiving log; When it is determined according to the receiving log and the sending log that the confidence probability of the household change relationship identification result of the electric energy meter is lower than a preset confidence probability threshold, re-determining the household change relationship of the electric energy meter; When the analog signal processing circuit does not perform harmonic filtering on the single-ended voltage signal after band-pass filtering, the higher harmonic frequency is dynamically calculated according to the power frequency current frequency, and the notch point parameters of the digital notch filter are set according to the higher harmonic frequency, so that the higher harmonic signal contained in the digital voltage signal is harmonically filtered by the digital notch filter; the characteristic current signal after harmonic filtering corresponds to two frequency points, and the two frequency points are simultaneously detected and comprehensively judged to identify the household change.

10. The household change relationship identification method according to claim 9, characterized in that: The acquiring the characteristic information according to the digital voltage signal and the valid signal determination threshold comprises: When the power values of a preset number of digital voltage signals obtained continuously are greater than the valid signal judgment threshold, the starting byte of the characteristic information is obtained according to the digital voltage signal, and when it is determined that the starting byte is correct, the remaining bytes of the characteristic information are obtained according to the digital voltage signal.

11. The household change relationship identification method according to claim 9 or 10, characterized in that: The method further comprises: When it is determined according to the reception log that the signal quality of the characteristic current signal is lower than a preset quality threshold, the household change relationship of the electric energy meter is determined according to the household change relationship identification result of the adjacent electric energy meters of the electric energy meter.

12. A computer-readable storage medium, characterized in that A household change relationship identification program is stored thereon, and when the household change relationship identification program is executed by the processor, the household change relationship identification method according to any one of claims 9 to 11 is implemented.

13. A household change relationship identification terminal, characterized in that: include: A memory, a processor, and a household change relationship identification program stored in the memory and capable of running on the processor. When the processor executes the program, the household change relationship identification method according to any one of claims 9 to 11 is implemented.

14. A transformer area topology identification system, characterized in that: The system includes: multiple household-to-transformer relationship identification devices according to any one of claims 1 to 8, wherein the multiple household-to-transformer relationship identification devices are respectively arranged at each power line branch in the transformer substation, and the electric energy meter on each power line branch is determined by the multiple household-to-transformer relationship identification devices, and the topology of the transformer substation is determined based on the electric energy meter on each power line branch.

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