阅读说明：本技术 一种输电线路行波监测终端的数据上传方法及系统 (Data uploading method and system for power transmission line traveling wave monitoring terminals ) 是由 莫刚 李克明 侯永洪 陈友坤 聂刚 聂晶 何阳健 刘峰海 庄红军 李义 吴瑀 于 2019-09-06 设计创作，主要内容包括：本发明公开的一种输电线路行波监测终端的数据上传系统,包括：数据采集单元：用于通过传感器采集电路采集输电线路上的行波电流波形；第一处理单元：用于通过检波电路对采集到的行波电流波形进行有效还原,得到一组新的电流波形；包络线绘制单元：根据新的电流波形绘制包络线；判断单元：用于对包络线中的采样点通过3σ准则进行有效性判断,剔除无效数据,保留有效数据；本发明通过对采集到的波形进行检波处理及有效性判断,可以实现无效波形的剔除以及有效波形部分无用点的剔除,保留了行波诊断所需的关键因素,减少下位机数据上传量,降低传感器采样率和数据上传流量费用,还降低了下位机功耗及监测终端对输电线路的负荷要求,增加其适用范围。(The invention discloses a data uploading system of power transmission line traveling wave monitoring terminals, which comprises a data acquisition unit, a processing unit, an envelope drawing unit, a judging unit and a lower computer, wherein the data acquisition unit is used for acquiring traveling wave current waveforms on a power transmission line through a sensor acquisition circuit, the processing unit is used for effectively restoring the acquired traveling wave current waveforms through a detection circuit to obtain groups of new current waveforms, the envelope drawing unit is used for drawing an envelope according to the new current waveforms, and the judging unit is used for judging the effectiveness of sampling points in the envelope through a 3 sigma criterion, eliminating invalid data and reserving effective data.)

The data uploading system of power transmission line traveling wave monitoring terminals is characterized by comprising the following components:

data acquisition unit (101): the sensor acquisition circuit is used for acquiring a traveling wave current waveform on the power transmission line;

the processing unit (102) is used for effectively restoring the collected traveling wave current waveforms through the detection circuit to obtain groups of new current waveforms;

envelope drawing unit (103): drawing an envelope line according to the new current waveform;

, a judgment unit (104) for judging the validity of the sampling points in the envelope curve through a 3 sigma criterion, eliminating invalid data and keeping valid data;

data upload unit (105): and the data processing device is used for uploading the effective data to an upper computer.

2. The data uploading system of the power transmission line traveling wave monitoring terminal, according to claim 1, is characterized in that the detector circuit includes a diode VD1, a resistor R1 and a capacitor C1, the anode of the diode VD1 is connected to the positive output terminal of the sensor acquisition circuit, the cathode of the diode VD1 is connected to the terminal of the resistor R1, the terminal of the capacitor C1 and the positive output terminal of the detector circuit, and the other terminal of the resistor R1 is connected to the negative output terminal of the sensor acquisition circuit, the other terminal of the capacitor C1 and the negative output terminal of the detector circuit.

3. The data uploading system of the traveling wave monitoring terminals of the power transmission line according to claim 2, wherein the parameter settings of the resistor R1 and the capacitor C1 satisfy

4. The data uploading system of power transmission line traveling wave monitoring terminals according to claim 1, wherein the th determining unit (104) specifically comprises:

a second processing unit (1041) for equally dividing the sampling points in the envelope, each comprising sets of data;

an calculation unit (1042) for calculating the mean μ and standard deviation σ of each set of data;

second calculation unit (1043): for calculating a confidence interval [ mu-3 sigma, mu +3 sigma ] for each set of data according to a 3 sigma criterion;

second determination unit (1044): and judging whether each group of data is in the corresponding confidence interval [ mu-3 sigma, mu +3 sigma ], if so, rejecting, and otherwise, retaining.

5. The data uploading system of the power transmission line traveling wave monitoring terminals according to claim 1, further comprising:

conversion unit (106): for converting the new current waveform into a digital signal through the A/D collector.

6, transmission line traveling wave monitoring terminal data uploading method, which is characterized in that the method comprises:

s101, collecting a traveling wave current waveform on the power transmission line through a sensor collecting circuit;

s102, converting the collected traveling wave current waveform into a digital signal through an A/D collector;

s103, performing Hilbert transform on the converted digital signals to obtain new ordered arrays;

s104, carrying out validity judgment on the ordered array through a 3 sigma criterion, eliminating invalid data and retaining valid data;

and S105, uploading the effective data to an upper computer.

7. The data uploading method of the power transmission line traveling wave monitoring terminals according to claim 6, wherein the judging of validity of the ordered array according to a 3 sigma criterion, eliminating invalid data and retaining valid data specifically comprises:

dividing the converted digital signals into equal parts, wherein each part comprises groups of data;

calculating the average value mu and the standard deviation sigma of each group of data;

calculating a confidence interval [ mu-3 sigma, mu +3 sigma ] of each group of data according to a 3 sigma criterion;

and judging whether each group of data is in the corresponding confidence interval [ mu-3 sigma, mu +3 sigma ], if so, rejecting, and otherwise, retaining.

8. The data uploading method of the power transmission line traveling wave monitoring terminals according to claim 7, wherein the calculation of the average value μ is calculated by the following formula:

in the formula (1), x₁+x₂+…+x_nFor each set of data values.

9. The data uploading method for the traveling wave monitoring terminal of the power transmission line according to claim 7, wherein the standard deviation σ is calculated by the following formula:

in the formula (2), σ²Is the variance of the group of data.

Technical Field

The invention belongs to the technical field of transmission line data uploading, and particularly relates to a data uploading method and system for transmission line traveling wave monitoring terminals.

Background

The traveling wave method is used as new transmission line fault location technologies, and compared with the traditional impedance location method, the traveling wave method has the advantages of being less affected by system parameters, transition resistance, a system operation mode and line loads and the like, so that -wide application is obtained in an electric power system.

In the data acquisition process of the power transmission line, besides fault and hidden danger discharge data, a large amount of discharge waveform data generated by interference of corona, spark discharge and the like can be acquired, the existence of the interference waveform can influence the analysis result, particularly the influence on high-frequency components, and in addition, can increase the power consumption and uploading flow of a lower computer, so that the lower computer is required to be removed.

The existing fault location adopts a timing wave recording method, namely, all data waveforms collected in specific time are uploaded, if the sampling rate of a monitoring terminal is 4MHz and the timing wave recording time is 15min, the uploaded data volume is hundreds of millions of points, the longer the wave recording time is, the larger the uploaded data volume is, the is overlarge, a large amount of flow is consumed to increase communication cost, the power consumption of the monitoring terminal is increased, the requirement of the monitoring terminal needing coupling energy acquisition on the load current of a power transmission line is high, the use range of the power transmission line is further influenced, and the large amount of noise waveforms are collected and uploaded, so that a large amount of storage space of an upper computer is occupied, and resource waste is caused.

Disclosure of Invention

The invention overcomes the defects in the prior art, and aims to provide data uploading methods and systems of the transmission line traveling wave monitoring terminal, which can reduce the data uploading amount of a lower computer and the sampling rate of a sensor.

In order to solve the technical problems, the technical scheme adopted by the invention is that the data uploading system of power transmission line traveling wave monitoring terminals comprises:

a data acquisition unit: the sensor acquisition circuit is used for acquiring a traveling wave current waveform on the power transmission line;

the processing unit is used for effectively restoring the collected traveling wave current waveforms through the detection circuit to obtain groups of new current waveforms;

an envelope drawing unit: drawing an envelope line according to the new current waveform;

an judging unit, which is used for judging the validity of the sampling points in the envelope curve through a 3 sigma criterion, eliminating invalid data and keeping valid data;

a data uploading unit: and the data processing device is used for uploading the effective data to an upper computer.

Preferably, the detector circuit comprises a diode VD1, a resistor R1 and a capacitor C1, wherein the anode of the diode VD1 is connected with the positive output end of the sensor acquisition circuit, the cathode of the diode VD1 is respectively connected with the end of the resistor R1, the end of the capacitor C1 and the positive output end of the detector circuit, and the other end of the resistor R1 is respectively connected with the negative output end of the sensor acquisition circuit, the other end of the capacitor C1 and the negative output end of the detector circuit.

, setting the parameters of the resistor R1 and the capacitor C1 to meet the requirements

Wherein f is_LFor the frequency of the detected signal, f_HThe highest frequency of the original traveling wave signal.

Preferably, the th judging unit specifically includes:

the second processing unit is used for equally dividing sampling points in the envelope, and each sampling point comprises groups of data;

an calculation unit for calculating the mean value mu and the standard deviation sigma of each group of data;

a second calculation unit: for calculating a confidence interval [ mu-3 sigma, mu +3 sigma ] for each set of data according to a 3 sigma criterion;

a second judgment unit: and judging whether each group of data is in the corresponding confidence interval [ mu-3 sigma, mu +3 sigma ], if so, rejecting, and otherwise, retaining.

Preferably, the method further comprises the following steps: a conversion unit: for converting the new current waveform into a digital signal through the A/D collector.

data uploading method of power transmission line traveling wave monitoring terminal includes:

s101, collecting a traveling wave current waveform on the power transmission line through a sensor collecting circuit;

s102, converting the collected traveling wave current waveform into a digital signal through an A/D collector;

s103, performing Hilbert transform on the converted digital signals to obtain new ordered arrays;

s104, carrying out validity judgment on the ordered array through a 3 sigma criterion, eliminating invalid data and retaining valid data;

and S105, uploading the effective data to an upper computer.

Preferably, the effectiveness judgment of the ordered array through a 3 sigma criterion, the elimination of invalid data and the reservation of valid data are carried out, specifically, the method comprises the steps of equally dividing converted digital signals, wherein each digital signal comprises groups of data, calculating the average value mu and the standard deviation sigma of each group of data, calculating the confidence interval [ mu-3 sigma, mu +3 sigma ] of each group of data according to the 3 sigma criterion, and judging whether each group of data is in the corresponding confidence interval [ mu-3 sigma, mu +3 sigma ], if so, eliminating and otherwise, reserving.

Preferably, the calculation of said mean value μ is calculated by the following formula:

in the formula (1), x₁+x₂+…+x_nFor each set of data values.

Preferably, the calculation of the standard deviation σ is calculated by the following formula:

in the formula (2), σ²Is the variance of the group of data.

Compared with the prior art, the invention has the following beneficial effects:

the invention relates to a data uploading method and a data uploading system of power transmission line traveling wave monitoring terminals, wherein a sensor acquisition circuit acquires traveling wave current waveforms on a power transmission line, a detection circuit effectively restores the acquired traveling wave current waveforms to obtain groups of new current waveforms, an envelope curve is drawn according to the new current waveforms, sampling points in the envelope curve are subjected to validity judgment according to a 3 sigma criterion, invalid data are removed, valid data are retained and uploaded to an upper computer, the invention can realize the removal of the invalid waveforms and the removal of useless points of the valid waveform parts by carrying out detection processing and validity judgment on the acquired waveforms on a lower computer, retains key factors required by traveling wave diagnosis, reduces the data uploading amount of the lower computer, can reduce the sampling rate of the sensor and reduce the data uploading flow cost on the aspect of , and reduces the power consumption of a lower computer on the aspect of , reduces the load requirement of the power transmission line by the monitoring terminals, and increases the application range of.

Drawings

The present invention is further described in detail below with reference to the attached drawing figures;

fig. 1 is a schematic structural diagram of a data uploading system of transmission line traveling wave monitoring terminals according to embodiment of the present invention;

fig. 2 is a schematic structural diagram of a data uploading system of power transmission line traveling wave monitoring terminals according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of a data uploading system of power transmission line traveling wave monitoring terminals according to a third embodiment of the present invention;

fig. 4 is a schematic flow chart of a data uploading method for power transmission line traveling wave monitoring terminals according to a fourth embodiment of the present invention;

FIG. 5 is a schematic drawing of a envelope curve in example of the present invention;

FIG. 6 is a schematic diagram showing a comparison between before and after waveform processing in example of the present invention;

fig. 7 is a schematic structural diagram of a monitoring terminal according to an embodiment of the present invention;

in the figure, 101 is a data acquisition unit, 102 is an th processing unit, 103 is an envelope drawing unit, 104 is a th judging unit, 1041 is a second processing unit, 1042 is a th calculating unit, 1043 is a second calculating unit, 1044 is a second judging unit, 105 is a data uploading unit, and 106 is a converting unit.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, it is obvious that the described embodiments are some, but not all embodiments of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

Fig. 1 is a schematic structural diagram of a data upload system of transmission line traveling wave monitoring terminals provided in embodiment of the present invention, and as shown in fig. 1, a data upload system of transmission line traveling wave monitoring terminals includes:

the data acquisition unit 101: the sensor acquisition circuit is used for acquiring a traveling wave current waveform on the power transmission line;

the processing unit 102 is used for effectively restoring the collected traveling wave current waveforms through the detection circuit to obtain groups of new current waveforms;

envelope drawing unit 103: drawing an envelope line according to the new current waveform;

, a judgment unit 104, for judging validity of the sampling points in the envelope curve by 3 sigma criterion, eliminating invalid data and keeping valid data;

the data upload unit 105: and the data processing device is used for uploading the effective data to an upper computer.

Specifically, an online monitoring terminal collects a traveling wave current waveform on a power transmission line through a sensor collecting circuit, the waveform is composed of a large number of sampling points, sampling points correspond to numerical values, collected data are fixed time periods (such as multiple power frequency periods), a detection circuit effectively restores the traveling wave current waveform to obtain new current waveforms, an envelope curve is drawn according to the new current waveform, validity judgment is conducted on the sampling points in the envelope curve, invalid data are removed, and the valid data are uploaded to an upper computer, as shown in fig. 5, a curve 1 is the traveling wave current waveform on the power transmission line and is processed by the detection circuit to obtain a curve 2 in a box, a curve 3 is the envelope curve drawn according to the new current waveform, as shown in fig. 6, a curve 4 is an original traveling wave current waveform, a curve 5 is a waveform graph obtained after the processing of the detection circuit, horizontal coordinate axes in fig. 5 and fig. 6 all represent time, vertical coordinates in fig. 5 and fig. 6 all represent , amplitude values can be obtained by comparing the waveforms after the detection processing, the traveling wave waveforms retain the waveform and the peak value-discharge time control data which can be further set on the premise that the parameters are not reduced.

When the wave-detection circuit is used for effectively reducing the traveling wave current waveform, if the frequency of the original traveling wave current waveform is 1MHz, the original traveling wave current waveform can be collected and effectively reduced only by the sampling rate of 2MHz, the detection circuit can be used for collecting high-frequency signals (for example, collecting 1MHz signals by the sampling rate of 100 kHz), and collecting data with the same time duration of , the data volume collected after the detection circuit is used is lower than that of the data volume without the detection circuit by tens of times, the detection circuit cannot really reduce traveling wave analog signal data, but the wave head identification of the original traveling wave current waveform has no influence, namely the accurate positioning is not influenced, and the service requirement can be met.

After the envelope curve is drawn according to the new current waveform, the peak point of the waveform can be extracted, sampling points of the rising edge and the falling edge of the waveform are abandoned, the natural frequency of the waveform is greatly reduced compared with the original waveform, the sampling rate of a subsequent A/D collector is fully reduced, the number of the sampling points can be greatly reduced aiming at the waveform with the same duration of , and the purpose of reducing the uploaded data volume is achieved.

, as shown in fig. 7, the detection circuit includes a diode VD1, a resistor R1 and a capacitor C1, the positive electrode of the diode VD1 is connected to the positive output terminal of the sensor acquisition circuit, the negative electrode of the diode VD1 is connected to the terminal of the resistor R1, the terminal of the capacitor C1 and the positive output terminal of the detection circuit, the other terminal of the resistor R1 is connected to the negative output terminal of the sensor acquisition circuit, the other terminal of the capacitor C1 and the negative output terminal of the detection circuit, the input terminal of the detection circuit is electrically connected to the output terminal of the sensor acquisition circuit, the output terminal of the detection circuit is electrically connected to the input terminal of the a/D collector, the a/D collector sends a signal to the host computer through a wireless sending circuit, and the detection circuit is added, which does not affect the post-positioning service, but greatly reduces the data uploading amount.

Specifically, the setting is set according to different conditions (such as the frequency of the original traveling wave current waveform, the required frequency of the processed new current waveform, and the like)And setting parameters of loop components. Preferably, in order to ensure that the charging and discharging speed of the capacitor is extremely high, the parameters of the resistor R1 and the capacitor C1 meet the requirements

Wherein f is_LFor the frequency of the detected signal, f_HSpecifically, signals at two ends of a capacitor C1 are measured, when a traveling wave current waveform on a power transmission line is at a rising edge (namely an amplitude rising section), a capacitor C1 is charged until the peak position, signals at two ends of a capacitor C1 can reach the peak value in a very short time because a diode VD1 is in a conducting state at the rising edge, when the traveling wave current waveform on the power transmission line is at a falling edge, the amplitude of the signals at two ends of a diode VD1 is higher than that of the original signals, the diode VD1 is discharged at the time, signals at two ends of the diode VD are maintained at the peak position until the discharging is finished or the rising edge of the original signals reappears, and simultaneously the voltage rises to a value higher than a peak point, the voltage at two ends of the capacitor C1 maintains the peak value of a rising edge, when the rising edge of the traveling wave current waveform on the power transmission line appears for the second time, whether the diode VD1 depends on whether the signal conducted at the rising edge of the th rising edge reaches the peak value at the th rising edge, if the peak value of the rising edge of the is exceeded, the diode VD 85 is conducted, the capacitor C1 is conducted, and the waveform of the traveling wave current waveform is collected at the peak value of a high frequency, and the peak value of the traveling wave current waveform of the capacitor C1, and the waveform is collected by a high frequency, and the sampling method is collected by a high.

According to the embodiment, the lower computer performs detection processing and effectiveness judgment on the acquired waveform, so that invalid waveforms can be removed and useless points of the effective waveform part can be removed, key factors required by traveling wave diagnosis are reserved, the data uploading amount of the lower computer is reduced, the sampling rate of the sensor can be reduced in the aspect of , the data uploading flow cost is reduced, the power consumption of the lower computer is reduced in the aspect of , the load requirement of the monitoring terminal on the power transmission line is reduced, and the application range of the monitoring terminal is enlarged.

Fig. 2 is a schematic structural diagram of a data uploading system of power transmission line traveling wave monitoring terminals according to a second embodiment of the present invention, and as shown in fig. 2, on the basis of the second embodiment , the -th judging unit 104 specifically includes:

the second processing unit 1041, which is used for equally dividing the sampling points in the envelope, wherein each sampling point comprises groups of data;

an calculation unit 1042 for calculating the mean μ and standard deviation σ of each set of data;

the second calculation unit 1043: for calculating a confidence interval [ mu-3 sigma, mu +3 sigma ] for each set of data according to a 3 sigma criterion;

second determination unit 1044: and judging whether each group of data is in the corresponding confidence interval [ mu-3 sigma, mu +3 sigma ], if so, rejecting, and otherwise, retaining.

Specifically, an online detection terminal collects traveling wave current waveforms with fixed time duration, after the traveling wave current waveforms are subjected to detection, envelope drawing and A/D collector processing, sampling points in the envelope are equally divided, each group of data comprises groups of data, the average value mu and the standard deviation sigma of each group of data and the confidence interval [ mu-3 sigma, mu +3 sigma ] of each group of data are calculated, the probability that the sampling points have data larger than mu +3 sigma or smaller than mu-3 sigma is small and is only below 0.26 percent according to a 3 sigma criterion, therefore, the data larger than mu +3 sigma or smaller than mu-3 sigma can be considered as effective points, the collected traveling wave current waveforms mostly are noises such as corona inherent to circuits, when the effective data exist, is effective, therefore, when effectiveness judgment is carried out through the 3 sigma criterion, the obtained average value mu, the standard deviation sigma and the collected noises are not much, the collected traveling wave current waveforms need to be removed, only points with larger values need to be reserved, and the probability that points with larger values are small segments, therefore, points with larger values are effective data points.

In the embodiment, the effectiveness of the sampling points is judged by the method, the sampling points judged to be invalid are set to zero and are not returned, and the sampling points judged to be valid are returned, so that the number of the sampling points required to be returned can be greatly reduced, and the reduction of data volume can reach more than 80%.

Fig. 3 is a schematic structural diagram of a data uploading system of power transmission line traveling wave monitoring terminals according to a third embodiment of the present invention, and as shown in fig. 3, on the basis of the second embodiment, the system further includes:

the conversion unit 106: and the device is used for converting the new traveling wave signal into a digital signal through the A/D collector.

Fig. 4 is a schematic flow chart of a data uploading method for transmission line traveling wave monitoring terminals according to a fourth embodiment of the present invention, and as shown in fig. 4, a data uploading method for transmission line traveling wave monitoring terminals includes:

s101, collecting a traveling wave current waveform on the power transmission line through a sensor collecting circuit;

s102, converting the collected traveling wave current waveform into a digital signal through an A/D collector;

s103, performing Hilbert transform on the converted digital signals to obtain new ordered arrays;

s104, carrying out validity judgment on the ordered array through a 3 sigma criterion, eliminating invalid data and retaining valid data;

and S105, uploading the effective data to an upper computer.

, the judging the validity of the ordered array by 3 σ criterion, eliminating invalid data, and retaining valid data specifically includes:

dividing the new ordered array into equal parts, wherein each part comprises groups of data;

calculating the average value mu and the standard deviation sigma of each group of data;

calculating a confidence interval [ mu-3 sigma, mu +3 sigma ] of each group of data according to a 3 sigma criterion;

and judging whether each group of data is in the corresponding confidence interval [ mu-3 sigma, mu +3 sigma ], if so, rejecting, and otherwise, retaining.

Preferably, the calculation of said mean value μ is calculated by the following formula:

in the formula (1), x₁+x₂+…+x_nFor each set of data values.

Preferably, the calculation of the standard deviation σ is calculated by the following formula:

in the formula (2), σ²Is the variance of the group of data.

Specifically, the sensor acquisition circuit acquires a traveling wave current waveform on the power transmission line, the traveling wave current waveform is converted into a digital signal through the A/D collector, the converted digital signal is subjected to Hilbert transform to obtain groups of new ordered arrays, the new ordered arrays are equally divided, each group comprises groups of data, and whether each group of data is in a corresponding confidence interval is judged according to a 3 sigma criterion, so that the purpose of uploading data quantity is greatly reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.