CN117970041A - Transmission line traveling wave monitoring method based on trigger threshold self-adaption - Google Patents
Transmission line traveling wave monitoring method based on trigger threshold self-adaption Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to the technical field of power transmission line monitoring, in particular to a power transmission line traveling wave monitoring method based on trigger threshold self-adaption. The fault locating device circularly collects high-frequency characteristics of the power transmission line in real time, and when the absolute value of the collected high-frequency characteristics is larger than the trigger threshold value of the fault locating device, traveling wave recording is triggered; judging whether the traveling wave triggering times exceeds the set times in the first time range, and if so, increasing the triggering threshold; judging whether the traveling wave triggering times in the second time range are less than the set times, and if so, reducing the triggering threshold. The fault locating device and the fault locating method can greatly reduce the false triggering probability of the fault locating device, avoid unreasonable setting of the traveling wave triggering threshold, ensure that the device can reliably collect real fault current traveling waves, and further effectively improve the reliability and the application value of the fault locating device.
Description
Technical Field
The invention relates to the technical field of power transmission line monitoring, in particular to a power transmission line traveling wave monitoring method.
Background
The high-voltage transmission line is a large artery of a power system, is usually erected in the field and is often subjected to lightning stroke, forest fire, tree barrier, external damage, icing, windage yaw and the like, so that the line trips, regional heavy power failure is caused, and serious economic loss and bad social influence are caused. When the fault occurs, the accurate position of the fault point is quickly and timely determined, and the power supply is recovered in the shortest time, so that the method has important significance. The power transmission line fault locating device is mounted on a power transmission line, can record high-frequency traveling wave current generated in the moment of power transmission line faults, then calculates the accurate position of a fault point according to the time difference of the traveling wave reaching the locating devices on two sides of the fault point, greatly saves line inspection time of power operation and maintenance personnel after the faults, guides accurate defect elimination, greatly shortens power failure recovery time, and has great application value.
The accurate calculation of the fault position of the power transmission line depends on the fact that the power transmission line fault positioning device can accurately record traveling wave current waveforms at fault moments. The existing fault positioning devices on the market at present all use the preset trigger threshold value as the criterion for recording the traveling wave current waveform according to the real-time current signal on the transmission line, namely, only when the high-frequency current larger than the trigger threshold value is detected, the traveling wave current is recorded. A large number of application cases also show that the power transmission line fault positioning device can normally collect traveling wave current higher than a set trigger threshold.
However, due to the complex operation environment of the transmission line, the background interference level of the transmission line is greatly different. Therefore, when the interference above the trigger threshold exists on the line, the device can be caused to frequently record a plurality of interference waveforms, namely, the device is caused to frequently trigger by mistake, which in turn can cause the device to frequently store and send data, consume the electric quantity and the communication flow of the device, and influence the acquisition of the real fault traveling wave current, thereby influencing the accurate positioning of faults. When the trigger threshold is set too high, the real fault traveling wave current may not reach the trigger threshold when the real fault traveling wave current is smaller, and then the device is caused to miss the traveling wave current, which also causes failure in fault location. In fact, the probability of transmission line faults is very low, and in most cases there is no real fault traveling wave current. Since the background interference levels in different places are different, the background interference level in the same place can also change greatly with time, so the trigger threshold should not be set to a constant value, but should be adaptively adjusted according to the interference level.
Disclosure of Invention
The invention aims to provide a transmission line traveling wave monitoring method based on trigger threshold self-adaption, which solves the technical problems; the technical problems solved by the invention can be realized by adopting the following technical scheme: the transmission line traveling wave monitoring method based on the self-adaption of the trigger threshold comprises the following steps that S1, a fault positioning device circularly collects high-frequency characteristics of a transmission line in real time, when the absolute value of the collected high-frequency characteristics is larger than the trigger threshold of the fault positioning device, traveling wave recording is triggered, and traveling wave waveforms of set time lengths before and after the trigger time are recorded; step S2, judging whether traveling wave triggering times in a first time range exceed set times, and if so, increasing the triggering threshold; if not, maintaining the current trigger threshold; judging whether the traveling wave triggering times are less than set times in a second time range, and if so, reducing the triggering threshold; if not, maintaining the current trigger threshold; and executing step S1 based on the adjusted trigger threshold.
Preferably, in step S1, the fault locating device is a traveling wave current type fault locating device or a traveling wave voltage type fault locating device, and the high frequency characteristic is a high frequency current value or a high frequency voltage value corresponding to the fault locating device.
Preferably, in step S1, when the fault locating device is a traveling wave current fault locating device, the initial trigger threshold is 10 a-30 a, the acquisition frequency is greater than 1MHz, the traveling wave recording is triggered when the absolute value of the high-frequency current value is greater than the trigger threshold, the duration Δt1 before the trigger time is recorded, the current waveform of the duration Δt2 after the trigger time is recorded, wherein Δt1 is greater than or equal to 300 μs, and Δt2 is greater than or equal to 900 μs.
Preferably, in step S1, when the fault locating device is a traveling wave voltage type fault locating device, the initial trigger threshold is 3000 v-9000 v, the acquisition frequency is greater than 1MHz, the traveling wave recording is triggered when the absolute value of the high-frequency voltage value is greater than the trigger threshold, the duration Δt1 before the trigger time is recorded, the voltage waveform of the duration Δt2 after the trigger time is greater than or equal to 300 μs, and Δt2 is greater than or equal to 900 μs.
Preferably, in step S2, the calculation formula for increasing the trigger threshold is that,
th2=th1×(1+A%)
Wherein th2 is the trigger threshold after adjustment, th1 is the trigger threshold before adjustment, and a is a threshold increase coefficient.
Preferably, in step S2, if satisfied,
At the position ofIn the time, the triggering quantity of the traveling waves is more than M1;
At the position of In the time, the triggering quantity of the traveling waves is more than M2;
At the position of In the time, the triggering quantity of the traveling waves is more than M3;
At the position of In the time, the triggering quantity of the traveling waves is more than M4;
And determining that the traveling wave triggering times exceeds the set times in the first time range, wherein a is a time coefficient, and T is a time interval for adjusting the triggering threshold.
Preferably, in step S2, the calculation formula for reducing the trigger threshold is that,
th2=th1×(1-B%)
Where th2 is the trigger threshold after adjustment, th1 is the trigger threshold before adjustment, and B is a threshold reduction coefficient.
Preferably, in step S2, if satisfied,
At the position ofIn the time, the triggering quantity of the traveling waves is smaller than N1;
At the position of In the time, the triggering quantity of the traveling waves is smaller than N2;
At the position of In the time, the triggering quantity of the traveling waves is less than N3;
At the position of In the time, the triggering quantity of the traveling waves is smaller than N4;
if any one of the traveling wave triggering times is less than the set times in the second time range, determining that the traveling wave triggering times are less than the set times in the second time range; where b is a time coefficient and T is a time interval for adjusting the trigger threshold.
Preferably, in step S2, the trigger threshold has an upper limit valueAnd lower limit/>The trigger threshold after adjustment is located at the upper limit value/>And the lower limit value/>Within the interval of (2), wherein the upper limit value/>Greater than the lower limit value/>。
Preferably, in step S2, the time interval for adjusting the trigger threshold is greater than 30min.
The invention has the beneficial effects that: by adopting the technical scheme, the traveling wave triggering threshold value is adaptively set according to the false triggering times (namely triggering caused by field interference) of the fault positioning device in a period of time, so that the false triggering probability of the fault positioning device is greatly reduced, the possible waveform missing problem is simultaneously reduced, the unreasonable setting of the traveling wave triggering threshold value is avoided, the device is ensured to reliably acquire real fault current traveling waves, and the reliability and the application value of the fault positioning device are further effectively improved.
Drawings
Fig. 1 is a schematic diagram of steps of a method for monitoring a traveling wave of a power transmission line according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
The transmission line traveling wave monitoring method based on the self-adaption of the trigger threshold is shown in fig. 1, and comprises the following steps that step S1, a fault positioning device circularly collects high-frequency characteristics of a transmission line in real time, when the absolute value of the collected high-frequency characteristics is larger than the trigger threshold of the fault positioning device, traveling wave recording is triggered, and traveling wave waveforms of set time lengths before and after the trigger time are recorded; step S2, judging whether traveling wave triggering times in a first time range exceed set times, and if so, increasing a triggering threshold; if not, maintaining the current trigger threshold; judging whether the traveling wave triggering times in the second time range are less than the set times, and if so, reducing the triggering threshold; if not, maintaining the current trigger threshold; step S1 is performed based on the adjusted trigger threshold.
Specifically, the invention adopts the technical thought that the traveling wave trigger threshold value is variable, namely, the traveling wave trigger threshold value is adaptively set according to the trigger times of the fault locating device in a period of time, so that the false trigger probability of the fault locating device is greatly reduced, unreasonable setting of the traveling wave trigger threshold value is avoided, the device is ensured to reliably collect real fault current traveling waves, and the reliability and the application value of the fault locating device are further effectively improved.
In a preferred embodiment, in step S1, the fault locating device is a traveling wave current type fault locating device or a traveling wave voltage type fault locating device, and the high frequency is characterized by a high frequency current value or a high frequency voltage value corresponding to the fault locating device.
Specifically, for example, when the fault locating device leaves the factory, the initial default trigger threshold of the device is set as th (initial); after the device is on line, the high-frequency current value of the power transmission line is circularly and rapidly acquired in real time, if the absolute value of the acquired high-frequency current is larger than the current trigger threshold value, a storage function is triggered to record the traveling wave current, the time when the high-frequency current passes through the trigger threshold value is called the trigger time, and the high-frequency current waveform with the duration delta t1 before the trigger time and the duration delta t2 after the trigger time is recorded, namely the traveling wave current.
In a preferred embodiment, in step S1, when the fault locating device is a traveling wave current type fault locating device, the initial trigger threshold is 10 a-30 a, the acquisition frequency is greater than 1MHz, the traveling wave recording is triggered when the absolute value of the acquired high-frequency current value is greater than the trigger threshold, the current waveform of the duration deltat 1 before the trigger time and the duration deltat 2 after the trigger time is recorded, wherein deltat 1 is greater than or equal to 300 μs, and deltat 2 is greater than or equal to 900 μs.
In particular, the method comprises the steps of,The high-speed acquisition frequency can be set to be a fixed value in the range of 10A-30A, the high-speed acquisition frequency is greater than 1MHz, the delta t1 is greater than or equal to 300 mu s, the delta t2 is greater than or equal to 900 mu s, namely the total time length of a single traveling wave current is greater than 1200 mu s.
Further specifically, it is preferable thatThe high-speed acquisition frequency may be taken as 2MHz, Δt1 may be taken as 300 μs, and Δt2 may be taken as 900 μs, i.e. the total duration of a single travelling wave current is 1200 μs.
In a preferred embodiment, in step S1, when the fault locating device is a traveling wave voltage type fault locating device, the initial trigger threshold is 3000 v-9000 v, the acquisition frequency is greater than 1MHz, the traveling wave recording is triggered when the absolute value of the acquired high-frequency voltage value is greater than the trigger threshold, the duration Δt1 before the trigger time is recorded, the duration Δt2 after the trigger time is recorded, wherein Δt1 is greater than or equal to 300 μs, and Δt2 is greater than or equal to 900 μs.
Specifically, the current value and the voltage value are both characteristic quantities reflecting line faults, so that based on the thought of the invention, besides the traveling wave current type fault positioning device, traveling wave voltage can be acquired for fault positioning, and the triggering principle and the positioning method of the traveling wave voltage type fault positioning device are completely consistent with those of the current type fault positioning device, so that the invention can also be used for self-adaptive setting of the triggering threshold value of the traveling wave voltage type fault positioning device.
In a preferred embodiment, in step S2, the calculation formula for increasing the trigger threshold is,
th2=th1×(1+A%)
Where th2 is the trigger threshold after adjustment, th1 is the trigger threshold before adjustment, and a is the threshold increase coefficient.
In a preferred embodiment, in step S2, if satisfied,
At the position ofIn the time, the triggering quantity of the traveling waves is more than M1;
At the position of In the time, the triggering quantity of the traveling waves is more than M2;
At the position of In the time, the triggering quantity of the traveling waves is more than M3;
At the position of In the time, the triggering quantity of the traveling waves is more than M4;
If the number of the triggering times of the traveling waves exceeds the set number of times in the first time range; where a is a time coefficient and T is a time interval for adjusting the trigger threshold.
Specifically, if the number of traveling wave triggers exceeds a given number of times in the first time range, it indicates that traveling wave triggers are too frequent, that is, the trigger threshold is set too low, and the adaptive adjustment method at this time is as follows: increasing the trigger threshold by A ", i.e
th2=th1×(1+A%)
In the invention, a plurality of criteria can be set simultaneously in a first time range and a given time, wherein any criterion is met, and the trigger threshold value is self-adaptively adjusted.
Typically, the invention sets four criteria, and if any of the following four conditions is met, the trigger threshold is adaptively adjusted.
1. At the position ofIn the time, the triggering quantity of the traveling waves is more than M1;
2. At the position of In the time, the triggering quantity of the traveling waves is more than M2;
3. At the position of In the time, the triggering quantity of the traveling waves is more than M3;
4. At the position of In the time, the triggering quantity of the traveling waves is more than M4;
Specifically, M1 is more than or equal to 5, M2 is more than or equal to 8, M3 is more than or equal to 11, M4 is more than or equal to 20, A is between 20 and 100, and coefficient a is between 1 and 24. Typically, m1=5, m2=8, m3=11, m4=20, a=50, a=1 are preferable.
In a preferred embodiment, in step S2, the calculation formula for decreasing the trigger threshold is,
th2=th1×(1-B%)
Where th2 is the trigger threshold after adjustment, th1 is the trigger threshold before adjustment, and B is the threshold reduction coefficient.
In a preferred embodiment, in step S2, if satisfied,
At the position ofIn the time, the triggering quantity of the traveling waves is smaller than N1;
At the position of In the time, the triggering quantity of the traveling waves is smaller than N2;
At the position of In the time, the triggering quantity of the traveling waves is less than N3;
At the position of In the time, the triggering quantity of the traveling waves is smaller than N4;
And determining that the traveling wave triggering times are less than the set times in the second time range, wherein b is a time coefficient, and T is an adjustment time interval.
Specifically, if the number of traveling wave triggers is less than a given number of times in the second time range, it indicates that traveling wave triggers are too rare, that is, the trigger threshold is set too high, and the adaptive adjustment method at this time is as follows: reducing the trigger threshold by B ", i.e
th2=th1×(1-B%)
In the invention, a plurality of criteria can be set simultaneously in the second time range and the given times, wherein any criterion is met, and the trigger threshold value is adaptively adjusted.
Typically, if four criteria are set, any of the following four conditions is satisfied, the trigger threshold is adaptively adjusted.
1. At the position ofIn the time, the triggering quantity of the traveling waves is smaller than N1;
2. At the position of In the time, the triggering quantity of the traveling waves is smaller than N2;
3. At the position of In the time, the triggering quantity of the traveling waves is less than N3;
4. At the position of In the time, the triggering quantity of the traveling waves is smaller than N4;
Preferably, N1 is less than or equal to 1, N2 is less than or equal to 3, N3 is less than or equal to 6, N4 is less than or equal to 20, B is between 20 and 50, and the coefficient b is between 12 and 360. Typically, n1=1, n2=2, n3=3, n4=6, b=33, b=120 are preferable.
In a preferred embodiment, in step S2, the trigger threshold has an upper limit valueAnd lower limit/>The adjusted trigger threshold is at the upper limit/>And lower limit/>In the interval of (2), wherein the upper limit value/>Greater than the lower limit value。
Specifically, in the above, the trigger threshold is adaptively adjustable, and its adjustment range is specified: the upper limit of the trigger threshold is limited toThat is, the trigger threshold is maximally assumed to be/>Even if the triggering is more frequent at this time, the triggering threshold value is not increased any more; the lower limit of the trigger threshold is limited to/>; That is, the trigger threshold minimum is taken as/>Even when the trigger is rare, the trigger threshold does not continue to decrease. Note/>Must be greater than/>。
In a preferred embodiment, in step S2, the time interval for adjusting the trigger threshold is greater than 30min.
Specifically, the trigger threshold is adaptively adjusted according to the trigger times of the fault locating device in a period of time, the trigger threshold updating and adjusting time interval is T, the T value is greater than 30min, frequent adjustment is avoided, typically, t=60 min is taken, that is, the trigger threshold is updated once every 60min according to the background interference level of the site.
In summary, the transmission line fault traveling wave monitoring method based on the self-adaption of the trigger threshold provided by the invention adopts the technical idea that the traveling wave trigger threshold is variable, and the trigger threshold is self-adaption adjusted according to the trigger times of the fault positioning device in a period of time: when the trigger threshold is set too low to cause frequent false triggering of the device, the trigger threshold is correspondingly improved; and when the trigger threshold is set too high to possibly cause missed acquisition of the device, the trigger threshold is correspondingly lowered. The method effectively solves the problems of frequent false triggering and missed mining risk of the device caused by setting the triggering threshold value to a fixed value, greatly improves the reliability of the fault positioning device and fully improves the application value of the fault positioning device, and has important significance for accurate operation and lean management of the high-voltage transmission line.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The transmission line traveling wave monitoring method based on the self-adaption of the trigger threshold is characterized by comprising the following steps that S1, a fault positioning device circularly collects high-frequency characteristics of a transmission line in real time, and when the absolute value of the collected high-frequency characteristics is larger than the trigger threshold of the fault positioning device, traveling wave recording is triggered, and traveling wave waveforms of set time lengths before and after the trigger moment are recorded; step S2, judging whether traveling wave triggering times in a first time range exceed set times, and if so, increasing the triggering threshold; if not, maintaining the current trigger threshold; judging whether the traveling wave triggering times are less than set times in a second time range, and if so, reducing the triggering threshold; if not, maintaining the current trigger threshold; and executing step S1 based on the adjusted trigger threshold.
2. The transmission line traveling wave monitoring method based on trigger threshold adaptation according to claim 1, wherein in step S1, the fault locating device is a traveling wave current type fault locating device or a traveling wave voltage type fault locating device, and the high frequency characteristic is a high frequency current value or a high frequency voltage value corresponding to the fault locating device.
3. The transmission line traveling wave monitoring method based on trigger threshold adaptation according to claim 2, wherein in step S1, when the fault locating device is a traveling wave current type fault locating device, the initial trigger threshold is 10 a-30 a, the acquisition frequency is greater than 1MHz, traveling wave recording is triggered when the absolute value of the high-frequency current value is greater than the trigger threshold, the duration Δt1 before the trigger moment is recorded, the current waveform of the duration Δt2 after the trigger moment is greater than or equal to 300 μs, and Δt2 is greater than or equal to 900 μs.
4. The transmission line traveling wave monitoring method based on trigger threshold adaptation according to claim 2, wherein in step S1, when the fault locating device is a traveling wave voltage type fault locating device, the initial trigger threshold is 3000 v-9000 v, the acquisition frequency is greater than 1MHz, traveling wave recording is triggered when the absolute value of the high-frequency voltage value is greater than the trigger threshold, the duration Δt1 before the trigger moment is recorded, the voltage waveform of the duration Δt2 after the trigger moment is greater than or equal to 300 μs, and Δt2 is greater than or equal to 900 μs.
5. The method for monitoring traveling wave of power transmission line based on adaptive trigger threshold according to claim 1, wherein in step S2, the calculation formula for adding the trigger threshold is as follows,
th2=th1×(1+A%)
Wherein th2 is the trigger threshold after adjustment, th1 is the trigger threshold before adjustment, and a is a threshold increase coefficient.
6. The method for monitoring traveling wave of power transmission line based on adaptive trigger threshold according to claim 1, wherein, in step S2, if satisfied,
At the position ofIn the time, the triggering quantity of the traveling waves is more than M1;
At the position of In the time, the triggering quantity of the traveling waves is more than M2;
At the position of In the time, the triggering quantity of the traveling waves is more than M3;
At the position of In the time, the triggering quantity of the traveling waves is more than M4;
And determining that the traveling wave triggering times exceeds the set times in the first time range, wherein a is a time coefficient, and T is a time interval for adjusting the triggering threshold.
7. The method for monitoring traveling wave of power transmission line based on adaptive trigger threshold according to claim 1, wherein in step S2, the calculation formula for reducing the trigger threshold is as follows,
th2=th1×(1-B%)
Where th2 is the trigger threshold after adjustment, th1 is the trigger threshold before adjustment, and B is a threshold reduction coefficient.
8. The method for monitoring traveling wave of power transmission line based on adaptive trigger threshold according to claim 1, wherein, in step S2, if satisfied,
At the position ofIn the time, the triggering quantity of the traveling waves is smaller than N1;
At the position of In the time, the triggering quantity of the traveling waves is smaller than N2;
At the position of In the time, the triggering quantity of the traveling waves is less than N3;
At the position of In the time, the triggering quantity of the traveling waves is smaller than N4;
if any one of the traveling wave triggering times is less than the set times in the second time range, determining that the traveling wave triggering times are less than the set times in the second time range; where b is a time coefficient and T is a time interval for adjusting the trigger threshold.
9. The transmission line traveling wave monitoring method based on trigger threshold adaptation according to claim 1, wherein in step S2, the trigger threshold has an upper limit valueAnd lower limit/>The trigger threshold after adjustment is located at the upper limit value/>And the lower limit value/>Within the interval of (2), wherein the upper limit value/>Greater than the lower limit value/>。
10. The transmission line traveling wave monitoring method based on trigger threshold adaptation according to claim 1, wherein in step S2, a time interval for adjusting the trigger threshold is greater than 30min.
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