CN115684717A - A high-voltage line harmonic detection device and method based on electric field coupling - Google Patents
A high-voltage line harmonic detection device and method based on electric field coupling Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及高压检测领域，特别是涉及一种基于电场耦合的高压线路谐波检测装置及方法。The invention relates to the field of high-voltage detection, in particular to a high-voltage line harmonic detection device and method based on electric field coupling.
背景技术Background technique
随着现代工业技术的发展，电力系统中非线性负荷大量增加，各种非线性和时变性电子装置大规模应用不可避免地将产生的谐波电流大量注入电网，造成了诸如电网电压波形畸变、电压闪变、干扰等现象，导致电能质量日趋恶化。世界各国十分重视供电可靠性和供电质量的管理，要求能够对电网质量以及保证电网可靠运行的辅助设备进行检测。电能质量谐波检测，成为了如今运检工作中不可或缺的一环。谐波指在电流中频率是基波频率的整数倍的电量，当电网中非线性负载较多时容易产生大量谐波，对电网造成危害，主要表现为：增加变压器的损耗、 缩短电动机的使用年限、造成配网中的导线耗损和中性线电流较大、造成电容器老化和损坏、引起继电保护误动作及造成测量仪表计量不准确等。因此为保证电网的正常运行，需要对电网中谐波进行监测，以便采取相应措施控制谐波。传统的谐波监测设备通过对电网的线路进行采样分析，从而实现对电网中谐波的监测。传统的高压输电线路谐波检測方法采用有线方式，在变电站中将谐波检测仪接入PT二次侧，通过检测PT二次端的小电压信号来检测母线上的电压，间接获得线路中谐波含量。然而该检测过程需要人工的进入，同时需要主动分析电网中谐波异常的状况，不利于电网状态的实时分析和监测。With the development of modern industrial technology, the nonlinear load in the power system has increased a lot, and the large-scale application of various nonlinear and time-varying electronic devices will inevitably inject a large amount of harmonic current into the grid, resulting in distortion of the grid voltage waveform, Voltage flicker, interference and other phenomena lead to deteriorating power quality. Countries all over the world attach great importance to the management of power supply reliability and power supply quality, and require the ability to detect the quality of the power grid and the auxiliary equipment that ensures the reliable operation of the power grid. Power quality harmonic detection has become an indispensable part of today's inspection work. Harmonic refers to the electricity whose frequency is an integer multiple of the fundamental frequency in the current. When there are many nonlinear loads in the power grid, a large number of harmonics are likely to be generated, which will cause harm to the power grid. The main manifestations are: increasing the loss of the transformer and shortening the service life of the motor. , causing loss of wires in the distribution network and large neutral wire current, aging and damage of capacitors, misoperation of relay protection, and inaccurate measurement of measuring instruments. Therefore, in order to ensure the normal operation of the power grid, it is necessary to monitor the harmonics in the power grid in order to take corresponding measures to control the harmonics. Traditional harmonic monitoring equipment realizes the monitoring of harmonics in the power grid by sampling and analyzing the lines of the power grid. The traditional harmonic detection method of high-voltage transmission lines adopts the wired method. The harmonic detector is connected to the secondary side of the PT in the substation, and the voltage on the bus is detected by detecting the small voltage signal of the secondary terminal of the PT, and the harmonics in the line are obtained indirectly. content. However, this detection process requires manual entry and active analysis of the abnormal harmonic conditions in the power grid, which is not conducive to real-time analysis and monitoring of the power grid status.
例如，一种在中国专利文献上公开的“一种配网谐波监测设备”，其公告号CN205176134U，涉及变频器故障检测技术领域，包括电压电流互感器、谐波检测装置、通信装置和监控装置，电压电流互感器接入配电变压器输送至用户负载的三相线路，谐波检测装置分别连接电压电流互感器和通信装置，通信装置连接监控装置；电压电流互感器将对应三相线路的电压电流信号输出至谐波检测装置，谐波检测装置接收电压电流信号后输出谐波数据，并通过通信装置将谐波数据输出至监控装置。因此，工作人员通过通信设备即可远程接收检测得到的谐波数据，实现在线监测，提高了谐波监测的便利性。然而该装置无法自动判断电网中存在的谐波异常信号，需要人工对谐波数据进行分析判断，使检测过程更加麻烦，无法自动对其中的异常信号进行预警。For example, a "distribution network harmonic monitoring device" disclosed in Chinese patent literature, its announcement number CN205176134U, relates to the technical field of frequency converter fault detection, including voltage and current transformers, harmonic detection devices, communication devices and monitoring device, the voltage and current transformer is connected to the three-phase line that is delivered to the user load by the distribution transformer, the harmonic detection device is respectively connected to the voltage and current transformer and the communication device, and the communication device is connected to the monitoring device; the voltage and current transformer will correspond to the three-phase line The voltage and current signals are output to the harmonic detection device, and the harmonic detection device outputs harmonic data after receiving the voltage and current signals, and outputs the harmonic data to the monitoring device through the communication device. Therefore, the staff can remotely receive the detected harmonic data through the communication equipment, realize online monitoring, and improve the convenience of harmonic monitoring. However, the device cannot automatically judge the abnormal harmonic signals existing in the power grid, and needs to manually analyze and judge the harmonic data, which makes the detection process more troublesome and cannot automatically give early warning of the abnormal signals.
发明内容Contents of the invention
本发明主要针对现有技术下高压电网谐波的人工检测麻烦、在线监测无法自动对其中的异常信号进行预警问题；提供了一种基于电场耦合的高压线路谐波检测装置及方法；通过电压耦合方式直接连接高压电网，利用高压谐波会在空载两端形成电压的方式获取谐波信号；通过建立谐波信号的历史数据模型，通过所测谐波的特征值分析谐波信号中是否存在异常，若存在异常可直接对异常状态进行后台预警，并直接关联谐波采集点，方便快速判断异常点。The present invention mainly aims at the troublesome manual detection of high-voltage power grid harmonics in the prior art, and the inability of online monitoring to automatically give early warning to abnormal signals therein; it provides a high-voltage line harmonic detection device and method based on electric field coupling; through voltage coupling The method is directly connected to the high-voltage power grid, and the harmonic signal is obtained by using the high-voltage harmonic to form a voltage at both ends of the no-load; by establishing a historical data model of the harmonic signal, and analyzing the presence or absence of the harmonic signal through the characteristic value of the measured harmonic Abnormal, if there is an abnormality, the background warning of the abnormal state can be directly carried out, and the harmonic collection point can be directly related to facilitate the rapid judgment of the abnormal point.
本发明的上述技术问题主要是通过下述技术方案得以解决的：Above-mentioned technical problem of the present invention is mainly solved by following technical scheme:
一种基于电场耦合的高压线路谐波检测装置，包括：电压信号耦合电路，和高压电网连接，用于测量高压电路中的谐波量；采集装置，用于对耦合电网电压信号的采集处理，计算电网各次谐波含量并经无线调制后向接收装置进行发射；接收装置，用于将接收到的谐波信息解调后实现显示各次谐波含量，并对异常信号进行预警。通过电压耦合方式直接连接高压电网，利用高压谐波会在空载两端形成电压的方式获取谐波信号，安全且方便，检测速度较人工PT设备检测较快，并且准确安全。A high-voltage line harmonic detection device based on electric field coupling, comprising: a voltage signal coupling circuit connected to a high-voltage power grid for measuring the amount of harmonics in the high-voltage circuit; an acquisition device for collecting and processing the voltage signal of the coupled power grid, Calculate each harmonic content of the power grid and transmit it to the receiving device after wireless modulation; the receiving device is used to demodulate the received harmonic information to display the harmonic content of each order, and to give early warning to abnormal signals. It is directly connected to the high-voltage power grid through the voltage coupling method, and the harmonic signal is obtained by using the high-voltage harmonic to form a voltage at both ends of the no-load, which is safe and convenient. The detection speed is faster than manual PT equipment, and it is accurate and safe.
作为优选，所述电压信号耦合电路包括电极，电阻R1，电感L1，电容C1，导体GDT，功率放大器U1，电阻R2，电阻R3和电容C2；高压线路通过电极连接电阻R1的端口1，电阻R1的端口2连接电感L1的端口1，电感L1的端口2连接电容C1端口1，电容C1的端口2接地；电阻R1的端口1连接导体GDT的端口1，导体GDT的端口2接地；电感L1端口2连接功率放大器U1的正向输入端，功率放大器U1的负向输入端连接功率放大器U1的输出端，功率放大器U1的输出端连接电阻R2的端口1，电阻R2的端口2连接电阻R3的端口1，电阻R3的端口2接地；电阻R3的端口1连接电容C2的端口1，电容C2的端口2接地；电容C2的端口1连接电压信号耦合电路的输出端。通过电路回路间的连接，使用电容滤除掉电路当中存在的电磁干扰信号，通过导体GDT两端的电压获取高压电网当中的谐波信号。Preferably, the voltage signal coupling circuit includes an electrode, a resistor R1, an inductor L1, a capacitor C1, a conductor GDT, a power amplifier U1, a resistor R2, a resistor R3 and a capacitor C2; the high voltage line is connected to
作为优选，所述装置外部设置防干扰壳体；所述防干扰壳体包括上壳体和下壳体；下壳体顶部设置有凸台，所述装置贴合下壳体设置，所述装置上设置有和凸台相对应的螺孔；所述壳体右侧设置有第一凸块；所述下壳体上设置有与接地线契合的接地孔；第一凸块上包含贯穿第一凸块的第一圆孔，另有一抱箍，抱箍上设置第二凸块；所述第二凸块上设置有适合第一圆孔的第二圆孔。防干扰外壳可以隔绝外部的电磁干扰，避免外界电磁干扰影响谐波的检测和判断；同时凸台支撑装置，而第一圆孔和第二圆孔契合固定，则可以将装置固定在抱箍上，且拆卸方便。As a preference, an anti-interference housing is provided outside the device; the anti-interference housing includes an upper housing and a lower housing; a boss is provided on the top of the lower housing, and the device is set in close contact with the lower housing, and the device A screw hole corresponding to the boss is provided on the top; a first bump is provided on the right side of the housing; a grounding hole that fits with the grounding wire is provided on the lower housing; the first bump includes a penetrating first The first circular hole of the protruding block is further provided with a hoop, and a second protruding block is arranged on the hoop; the second protruding block is provided with a second circular hole suitable for the first circular hole. The anti-interference shell can isolate external electromagnetic interference and avoid external electromagnetic interference from affecting the detection and judgment of harmonics; at the same time, the boss supports the device, and the first round hole and the second round hole fit and fix the device can be fixed on the hoop , and easy to disassemble.
作为优选，所述装置间通过无线网络进行通讯，保证装置内部的设备运行通畅。Preferably, the devices communicate through a wireless network to ensure smooth operation of devices inside the devices.
一种高压线路谐波检测方法，采用上述装置，包括，A high-voltage line harmonic detection method, using the above-mentioned device, comprising:
步骤S1、选取多个待检测点；采集待检测点处任一频次谐波的多个监测数据；Step S1, selecting a plurality of points to be detected; collecting a plurality of monitoring data of harmonics of any frequency at the points to be detected;
步骤S2、将监测数据划分为多段数据；计算每段数据的特征值；获取历史数据模型；根据特征值判断段数据是否存在异常；Step S2, dividing the monitoring data into multiple segments of data; calculating the characteristic value of each segment of data; obtaining a historical data model; judging whether the segment data is abnormal according to the characteristic value;
步骤S3、若段数据存在异常，则采集异常的持续时间；Step S3, if there is an abnormality in the segment data, collect the duration of the abnormality;
步骤S4、根据异常持续时间判断所述频次谐波是否存在异常，若异常持续时间超出预警时间，则后台提示预警，并上报异常状态，关联异常谐波出现的待采集点。Step S4. Determine whether the frequency harmonic is abnormal according to the duration of the abnormality. If the duration of the abnormality exceeds the warning time, the background prompts an early warning, reports the abnormal state, and associates the point to be collected where the abnormal harmonic occurs.
通过建立谐波信号的历史数据模型，通过所测谐波的特征值分析谐波信号中是否存在异常，若存在异常可直接对异常状态进行后台预警，并直接关联谐波采集点，方便快速判断异常点。By establishing the historical data model of the harmonic signal, analyze whether there is anomaly in the harmonic signal through the characteristic value of the measured harmonic, if there is an abnormality, it can directly give background warning to the abnormal state, and directly associate with the harmonic collection point, which is convenient and quick to judge Outlier.
作为优选，所述步骤S2中历史数据模型的获取方法如下：As a preference, the method for obtaining the historical data model in the step S2 is as follows:
步骤S21、设定特殊周期，采集历史监测点各频次谐波数据；Step S21, setting a special period, and collecting harmonic data of each frequency of historical monitoring points;
步骤S22、设置偏差范围，将所有样本聚类拟合在同一坐标系中，取中位值，最大值和最小值；若样本谐波数据偏离该频次中位曲线，且偏离范围超出所设置的偏差范围，则筛除该样本；若偏离范围未超出所设置的偏差范围，则该样本为有效样本数据；分别计算各样本数据组的样本特征值；Step S22, set the deviation range, cluster and fit all samples in the same coordinate system, take the median value, maximum value and minimum value; if the sample harmonic data deviates from the frequency median curve, and the deviation range exceeds the set If the deviation range does not exceed the set deviation range, then the sample is valid sample data; respectively calculate the sample eigenvalues of each sample data group;
步骤S23、该频次的样本特征值即为该频次的历史数据模型。Step S23, the sample feature value of the frequency is the historical data model of the frequency.
特征值作为谐波的一个重要评判数据，可以作为判断谐波正常与否的标准。而标准的设立需要通过采集同样频次的多个数据进行数据库的建立和筛选。采集不同待采集点的多个频次的历史数据能够使样本数据当中存在足够多的点方便后续的判断，并且作为后续检测的异常判断的依据。As an important judging data of harmonics, eigenvalues can be used as a criterion for judging whether the harmonics are normal or not. The establishment of standards requires the establishment and screening of databases by collecting multiple data with the same frequency. Collecting historical data of multiple frequencies at different points to be collected can make there are enough points in the sample data to facilitate subsequent judgments, and serve as a basis for abnormal judgments in subsequent detections.
作为优选，所述步骤S2中根据特征值判断段数据是否存在异常的判断方法如下：其特征值是否超出步骤S22所述偏差范围，若超出则视为异常值。偏差范围可以通过个人需要设定，一般则需要根据待检测点关联的用户节点数，若该用户节点数所安装的产生谐波的数量多，则可能产生异常较大的情况，但是该异常值则为一个稳定的数值，并不是具备波动性的异常，因此不同的情况需要根据不同的节点连接状态进行判断。Preferably, the method of judging whether there is abnormality in the segment data according to the characteristic value in the step S2 is as follows: whether the characteristic value exceeds the deviation range described in the step S22, and if it exceeds, it is regarded as an abnormal value. The deviation range can be set according to individual needs. Generally, it needs to be based on the number of user nodes associated with the points to be detected. If the number of harmonics generated by the installation of the number of user nodes is large, an abnormally large situation may occur, but the abnormal value It is a stable value, not an abnormality with volatility, so different situations need to be judged according to different node connection states.
作为优选，所述待采集点的选取优先选择有关联关系的电路节点，即用户设备连接节点；在与多个节点有关联关系的电路节点中，选取关联节点多的节点。关联节点多，接入的设备越多，产生的谐波信号便越多，因此多关联节点处的数据更具备参考价值，优先选取此处的数据能够使谐波数据能够更好的反应电路中存在的谐波信号。Preferably, the selection of the points to be collected gives priority to selecting circuit nodes with associated relationships, that is, user equipment connection nodes; among circuit nodes associated with multiple nodes, select nodes with more associated nodes. There are many associated nodes, and the more devices connected, the more harmonic signals will be generated. Therefore, the data at multi-associated nodes has more reference value. Prioritizing the data here can make the harmonic data better reflect the circuit. the presence of harmonic signals.
本发明的有益效果是：The beneficial effects of the present invention are:
通过电压耦合方式直接连接高压电网，利用高压谐波会在空载两端形成电压的方式获取谐波信号；通过建立谐波信号的历史数据模型，通过所测谐波的特征值分析谐波信号中是否存在异常，若存在异常可直接对异常状态进行后台预警，并直接关联谐波采集点，方便快速判断异常点。Directly connect to the high-voltage power grid through voltage coupling, and use high-voltage harmonics to form voltages at both ends of the no-load to obtain harmonic signals; establish a historical data model of harmonic signals, and analyze harmonic signals through the characteristic values of the measured harmonics Whether there is an abnormality in the system, if there is an abnormality, the background warning of the abnormal state can be directly carried out, and the harmonic collection point can be directly related to facilitate the rapid judgment of the abnormal point.
附图说明Description of drawings
图1为本发明流程图；Fig. 1 is a flowchart of the present invention;
图2为电压信号耦合电路图；Fig. 2 is a voltage signal coupling circuit diagram;
图3为防干扰外壳结构图。Figure 3 is a structural diagram of the anti-interference shell.
具体实施方式Detailed ways
应理解，实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解，在阅读了本发明讲授的内容之后，本领域技术人员可以对本发明作各种改动或修改，这些等价形式同样落于本申请所附权利要求书所限定的范围。It should be understood that the examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.
下面通过实施例，对本发明的技术方案作进一步具体的说明。The technical solutions of the present invention will be further specifically described below through examples.
一种基于电场耦合的高压线路谐波检测装置，包括：电压信号耦合电路，和高压电网连接，用于测量高压电路中的谐波量；采集装置，用于对耦合电网电压信号的采集处理，计算电网各次谐波含量并经无线调制后向接收装置进行发射；接收装置，用于将接收到的谐波信息解调后实现显示各次谐波含量，并对异常信号进行预警。通过电压耦合方式直接连接高压电网，利用高压谐波会在空载两端形成电压的方式获取谐波信号，安全且方便，检测速度较人工PT设备检测较快，并且准确安全。内部装置通过无线网络进行通讯，能够快速传递信息，并且可以通过无线网络将采集到的装置信息传递至后台。A high-voltage line harmonic detection device based on electric field coupling, comprising: a voltage signal coupling circuit connected to a high-voltage power grid for measuring the amount of harmonics in the high-voltage circuit; an acquisition device for collecting and processing the voltage signal of the coupled power grid, Calculate each harmonic content of the power grid and transmit it to the receiving device after wireless modulation; the receiving device is used to demodulate the received harmonic information to display the harmonic content of each order, and to give early warning to abnormal signals. It is directly connected to the high-voltage power grid through the voltage coupling method, and the harmonic signal is obtained by using the high-voltage harmonic to form a voltage at both ends of the no-load, which is safe and convenient. The detection speed is faster than manual PT equipment, and it is accurate and safe. The internal device communicates through the wireless network, which can quickly transmit information, and the collected device information can be transmitted to the background through the wireless network.
该装置外部设置防干扰壳体，防干扰外壳可以隔绝外部的电磁干扰，避免外界电磁干扰影响谐波的检测和判断；同时凸台支撑装置，而第一圆孔和第二圆孔契合固定，则可以将装置固定在抱箍上，且拆卸方便。凸台可以直接抵在装置底部，通过螺孔固定，保证装置稳固，同时上壳体和下壳体的组合能够保证拆卸方便，壳体外的抱箍上的第二凸块可以贯穿防干扰壳体的第一凸块内部，通过螺孔将两者连接，不仅可以排除外部的电磁干扰对内部电路的影响，同时可以方便安装和拆卸。The device is equipped with an anti-interference shell, which can isolate external electromagnetic interference and prevent external electromagnetic interference from affecting the detection and judgment of harmonics; at the same time, the boss supports the device, and the first round hole and the second round hole fit and fix, Then the device can be fixed on the hoop, and it is easy to disassemble. The boss can directly touch the bottom of the device and be fixed through the screw hole to ensure the stability of the device. At the same time, the combination of the upper shell and the lower shell can ensure easy disassembly. The second protrusion on the hoop outside the shell can penetrate the anti-interference shell Inside the first bump, the two are connected through screw holes, which can not only eliminate the influence of external electromagnetic interference on the internal circuit, but also facilitate installation and disassembly.
一种高压线路谐波检测方法，采用上述装置，包括，A high-voltage line harmonic detection method, using the above-mentioned device, comprising:
步骤S1、选取多个待检测点；采集待检测点处任一频次谐波的多个监测数据；Step S1, selecting a plurality of points to be detected; collecting a plurality of monitoring data of harmonics of any frequency at the points to be detected;
步骤S2、将监测数据划分为多段数据；计算每段数据的特征值；获取历史数据模型；根据特征值判断段数据是否存在异常；Step S2, dividing the monitoring data into multiple segments of data; calculating the characteristic value of each segment of data; obtaining a historical data model; judging whether the segment data is abnormal according to the characteristic value;
步骤S3、若段数据存在异常，则采集异常的持续时间；Step S3, if there is an abnormality in the segment data, collect the duration of the abnormality;
步骤S4、根据异常持续时间判断所述频次谐波是否存在异常，若异常持续时间超出预警时间，则后台提示预警，并上报异常状态，关联异常谐波出现的待采集点。Step S4. Determine whether the frequency harmonic is abnormal according to the duration of the abnormality. If the duration of the abnormality exceeds the warning time, the background prompts an early warning, reports the abnormal state, and associates the point to be collected where the abnormal harmonic occurs.
通过建立谐波信号的历史数据模型，通过所测谐波的特征值分析谐波信号中是否存在异常，若存在异常可直接对异常状态进行后台预警，并直接关联谐波采集点，方便快速判断异常点。By establishing the historical data model of the harmonic signal, analyze whether there is anomaly in the harmonic signal through the characteristic value of the measured harmonic, if there is an abnormality, it can directly give background warning to the abnormal state, and directly associate with the harmonic collection point, which is convenient and quick to judge Outlier.
所述步骤S2中历史数据模型的获取方法如下：The acquisition method of the historical data model in the step S2 is as follows:
步骤S21、设定特殊周期，采集历史监测点各频次谐波数据；Step S21, setting a special period, and collecting harmonic data of each frequency of historical monitoring points;
步骤S22、设置偏差范围，将所有样本聚类拟合在同一坐标系中，取中位值，最大值和最小值；若样本谐波数据偏离该频次中位曲线，且偏离范围超出所设置的偏差范围，则筛除该样本；若偏离范围未超出所设置的偏差范围，则该样本为有效样本数据；分别计算各样本数据组的样本特征值；其特征值是否超出步骤S22所述偏差范围，若超出则视为异常值。偏差范围可以通过个人需要设定，一般则需要根据待检测点关联的用户节点数，若该用户节点数所安装的产生谐波的数量多，则可能产生异常较大的情况，但是该异常值则为一个稳定的数值，并不是具备波动性的异常，因此不同的情况需要根据不同的节点连接状态进行判断。Step S22, set the deviation range, cluster and fit all samples in the same coordinate system, take the median value, maximum value and minimum value; if the sample harmonic data deviates from the frequency median curve, and the deviation range exceeds the set deviation range, then screen out the sample; if the deviation range does not exceed the set deviation range, then the sample is valid sample data; respectively calculate the sample eigenvalues of each sample data group; whether the eigenvalues exceed the deviation range described in step S22 , if it exceeds, it will be regarded as an outlier. The deviation range can be set according to individual needs. Generally, it needs to be based on the number of user nodes associated with the points to be detected. If the number of harmonics generated by the installation of the number of user nodes is large, an abnormally large situation may occur, but the abnormal value It is a stable value, not an abnormality with volatility, so different situations need to be judged according to different node connection states.
步骤S23、该频次的样本特征值即为该频次的历史数据模型。特征值作为谐波的一个重要评判数据，可以作为判断谐波正常与否的标准。而标准的设立需要通过采集同样频次的多个数据进行数据库的建立和筛选。采集不同待采集点的多个频次的历史数据能够使样本数据当中存在足够多的点方便后续的判断，并且作为后续检测的异常判断的依据。Step S23, the sample feature value of the frequency is the historical data model of the frequency. As an important judging data of harmonics, eigenvalues can be used as a criterion for judging whether the harmonics are normal or not. The establishment of standards requires the establishment and screening of databases by collecting multiple data with the same frequency. Collecting historical data of multiple frequencies at different points to be collected can make there are enough points in the sample data to facilitate subsequent judgments, and serve as a basis for abnormal judgments in subsequent detections.
待采集点的选取优先选择有关联关系的电路节点，即用户设备连接节点；在与多个节点有关联关系的电路节点中，选取关联节点多的节点。关联节点多，接入的设备越多，产生的谐波信号便越多，因此多关联节点处的数据更具备参考价值，优先选取此处的数据能够使谐波数据能够更好的反应电路中存在的谐波信号。The selection of the points to be collected gives priority to selecting circuit nodes with associated relationships, that is, user equipment connection nodes; among circuit nodes associated with multiple nodes, select nodes with more associated nodes. There are many associated nodes, and the more devices connected, the more harmonic signals will be generated. Therefore, the data at multi-associated nodes has more reference value. Prioritizing the data here can make the harmonic data better reflect the circuit. the presence of harmonic signals.
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