CN114002555B - Edge calculation method based on distributed fault wave recording unit - Google Patents
Edge calculation method based on distributed fault wave recording unit Download PDFInfo
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- CN114002555B CN114002555B CN202111286246.6A CN202111286246A CN114002555B CN 114002555 B CN114002555 B CN 114002555B CN 202111286246 A CN202111286246 A CN 202111286246A CN 114002555 B CN114002555 B CN 114002555B
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- 230000002194 synthesizing effect Effects 0.000 claims abstract description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
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- 230000001052 transient effect Effects 0.000 claims description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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Abstract
The invention relates to an edge calculation method based on a distributed fault wave recording unit, which comprises the following sequential steps: performing differential compensation on the amplitude and polarity of the instantaneous sampling value of the voltage and current signals of the monitored feeder line; synthesizing a zero sequence signal; filtering the signals; performing fault starting; determining a fault starting point; calculating a fault phase; ending the fault; all data are recorded in a standard comtwade data format and named by time. The invention is internally arranged in the distributed fault wave recording units distributed on different feeder lines or at different positions of the feeder lines, can effectively process the original data and avoid uploading redundant data to the cloud. And the data is analyzed and the threshold value is judged, so that the abnormal information is effectively identified, the terminal equipment is converted into a terminal system combined with active analysis and early warning from passive monitoring, the data of the terminal application can be processed in real time at a high speed at the first time, and the timeliness is enhanced.
Description
Technical Field
The invention relates to the technical field of fault wave recording of power systems, in particular to an edge computing method based on a distributed fault wave recording unit.
Background
The dynamic fault recording device for the power system is widely applied to 110kV and above substations and is used for recording the whole process of various faults, various parameters, the derived quantity and related non-electric quantity changes in the power system. However, no fault dynamic recording device is currently provided for 35kV or 10kV lines.
The patent application number is 2015113369. X, the patent name is a fault monitoring device based on distributed wave recording, and the fault monitoring device based on distributed wave recording is provided. But no specific algorithm is proposed.
The patent application number is 201610168937.9, the patent name is a patent of a wide area fault wave recording system and a synchronization method, and the wide area cross-station synchronous wave recording is carried out by utilizing a general network with longer communication delay so as to meet the wide area synchronous wave recording requirement of a strong correlation system such as railway traction power supply and the like, mainly solves the problem of synchronous starting, and does not explain fault starting and the like.
The patent application number is 202010240114.9, the patent name is a single-phase earth fault positioning device and method of a power distribution network based on edge calculation, the problem that a wave head of a fault waveform is quickly found is solved, and meanwhile, a converging module of each measuring point measuring device sends the wave head of each measuring point to a positioning calculation module of an automatic main station of the power distribution network for fault positioning by utilizing a high-precision time synchronization mechanism. But it is not described with respect to specific criteria and algorithms of the station measuring device.
Disclosure of Invention
The invention aims to provide the distributed fault wave recording unit-based edge computing method which is used for respectively recording waves through a plurality of distributed fault wave recording units distributed on different feeder lines or at different positions of the feeder lines, analyzing, processing and comprehensively judging data according to a configured edge computing method, and storing or uploading according to a result, so that bandwidth pressure is reduced, and the real-time processing performance of a terminal is enhanced.
In order to achieve the above purpose, the present invention adopts the following technical scheme: an edge calculation method based on a distributed fault wave recording unit, which comprises the following sequential steps:
(1) Performing differential compensation on the amplitude and polarity of the instantaneous sampling value of the voltage and current signals of the monitored feeder line;
(2) Synthesizing a zero sequence signal;
(3) Filtering the signals;
(4) Performing fault starting;
(5) Determining a fault starting point;
(6) Calculating a fault phase;
(7) Determining that the fault is ended;
(8) Recording fault data: all data are recorded in a standard comtwade data format and named by time.
The step (1) specifically refers to:
Performing amplitude compensation on the instantaneous sampling values of the voltage and current signals; when the amplitude difference between the three-phase and zero-sequence voltage channels/the three-phase and zero-sequence current channels is less than 5%, amplitude compensation is not performed;
performing polarity compensation on the instantaneous sampling values of the voltage and current signals; when the polarities between the three-phase voltages, the three-phase currents and the voltages and the currents are the same, no polarity compensation is performed.
The step (2) specifically refers to:
the synthesis of the zero sequence current instantaneous value i 0 (k) is carried out, and the synthesis value is i 0 (k) which is 3 times:
i0(k)＝iA(k)+iB(k)+iC(k)
Wherein i A(k)、iB(k)、iC (k) is a sampling value of the phase A, phase B and phase C currents after amplitude and polarity compensation; k=1, 2,3 … …, k is the sampling point;
Synthesizing the zero sequence voltage u 0 (k) with the synthesized value of U 0 (k) times:
wherein u A(k)、uB(k)、uC (k) is the sampling value of the A phase, B phase and C phase voltages after amplitude and polarity compensation.
The step (3) specifically refers to: the method comprises the following steps of:
(3a) Filtering the direct current component of the original data x [ k ] to obtain x d [ k ]:
where k=1, 2,) where K, K refers to the kth sample point, K is 256 or 200, 256 or 200 is the number of discrete sample points per cycle;
(3b) Then, carrying out band-pass filtering on x d [ k):
Adopting an IIR digital band-pass filter, wherein the passband frequency is 100Hz < omega <1000Hz, the maximum ripple wave in the passband is 3dB, the minimum attenuation is 30dB when the ripple wave is 50Hz, and the maximum attenuation of the filter is 9 points;
The filtering formula is:
Wherein, k=1, 2,) the.i., K, b, a are filter coefficients, y is filtered data, exceeding k=1, 2,) the.i., x d (K) of the K range, y (K) is replaced by 0 when used for the first time.
The step (4) specifically refers to:
In a power frequency period, the calculation formula of the zero sequence voltage true effective value U T is as follows:
Or alternatively
Taking the frequency as a unit, comparing the zero sequence voltage amplitude U T of each frequency with a voltage starting threshold, and entering a fault processing program if the zero sequence voltage amplitude U T is larger than the voltage starting threshold;
After the fault is started, determining a fault starting point k F: sequentially comparing zero sequence voltage instantaneous values from the previous cycle of fault starting, and determining a point that the amplitude of the first instantaneous value is 1.4 times greater than the voltage starting threshold as a starting point of the fault starting;
When the zero sequence voltage of 2 or more continuous cycles exceeds a threshold, confirming the zero sequence voltage as a ground fault, otherwise, considering transient disturbance; the threshold is an effective value of the set voltage;
the end of the transient disturbance is the second cycle after the fault is started, namely, if the zero sequence voltage exceeds the threshold again from the third cycle, a new fault is considered.
The step (5) specifically refers to:
The fault starting time is based on the time of the fault starting point k F;
After determining the occurrence of the ground fault and the fault starting point k F, firstly determining the fault starting time;
the fault start time is equal to the time from the current moment minus the fault start point k F to the end of the acquisition cycle, and minus the time from the end of the sampling to the current moment.
The step (6) specifically refers to:
Judging a fault phase according to the amplitude and the phase of the power frequency component of each phase voltage of the next cycle after the fault is started; when one phase voltage is smaller than the rated voltage and the other two phases voltage is larger than the rated voltage, the phase with reduced voltage is a fault phase;
when the two-phase voltage is smaller than the rated voltage and the other phase voltage is larger than the rated voltage, the phase with the advanced phase in the two-phase voltage with the reduced amplitude is a fault phase;
wherein the rated voltage corresponds to an input voltage of 57.5V, and the phase lead is in a range of 0 to 180 degrees.
The step (7) specifically refers to:
For the confirmed ground fault, determining that the fault is ended when the duration of the zero sequence voltage amplitude calculated according to the cycle is lower than the starting threshold for more than 1 minute;
if the zero sequence voltage is again greater than the starting threshold within 1 minute, the same fault is considered; after 1 minute, the zero sequence voltage is larger than the starting threshold again, and then a new start is considered;
Determination of a fault end point: and the time corresponding to the cycle of which the last zero sequence voltage is higher than a threshold, namely the time corresponding to the cycle of which the fault is judged to be ended, is retreated forwards for 1 minute, wherein the threshold is an effective value of the set voltage.
According to the technical scheme, the beneficial effects of the invention are as follows: the invention is internally arranged in the distributed fault wave recording units distributed on different feeder lines or at different positions of the feeder lines, can effectively process the original data and avoid uploading redundant data to the cloud. And the data is analyzed and the threshold value is judged, so that the abnormal information is effectively identified, the terminal equipment is converted into a terminal system combined with active analysis and early warning from passive monitoring, the data of the terminal application can be processed in real time at a high speed at the first time, and the timeliness is enhanced.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
As shown in fig. 1, an edge calculation method based on a distributed fault recording unit includes the following sequential steps:
(1) Performing differential compensation on the amplitude and polarity of the instantaneous sampling value of the voltage and current signals of the monitored feeder line;
(2) Synthesizing a zero sequence signal;
(3) Filtering the signals;
(4) Performing fault starting;
(5) Determining a fault starting point;
(6) Calculating a fault phase;
(7) Determining that the fault is ended;
(8) Recording fault data: all data are recorded in a standard comtwade data format and named by time.
The step (1) specifically refers to:
Performing amplitude compensation on the instantaneous sampling values of the voltage and current signals; when the amplitude difference between the three-phase and zero-sequence voltage channels/the three-phase and zero-sequence current channels is less than 5%, amplitude compensation is not performed;
performing polarity compensation on the instantaneous sampling values of the voltage and current signals; when the polarities between the three-phase voltages, the three-phase currents and the voltages and the currents are the same, no polarity compensation is performed.
The step (2) specifically refers to:
the synthesis of the zero sequence current instantaneous value i 0 (k) is carried out, and the synthesis value is i 0 (k) which is 3 times:
i0(k)＝iA(k)+iB(k)+iC(k)
Wherein i A(k)、iB(k)、iC (k) is a sampling value of the phase A, phase B and phase C currents after amplitude and polarity compensation; k=1, 2,3 … …, k is the sampling point;
Synthesizing the zero sequence voltage u 0 (k) with the synthesized value of U 0 (k) times:
wherein u A(k)、uB(k)、uC (k) is the sampling value of the A phase, B phase and C phase voltages after amplitude and polarity compensation.
The step (3) specifically refers to: the method comprises the following steps of:
(3a) Filtering the direct current component of the original data x [ k ] to obtain x d [ k ]:
where k=1, 2,) where K, K refers to the kth sample point, K is 256 or 200, 256 or 200 is the number of discrete sample points per cycle;
(3b) Then, carrying out band-pass filtering on x d [ k):
Adopting an IIR digital band-pass filter, wherein the passband frequency is 100Hz < omega <1000Hz, the maximum ripple wave in the passband is 3dB, the minimum attenuation is 30dB when the ripple wave is 50Hz, and the maximum attenuation of the filter is 9 points;
The filtering formula is:
Wherein, k=1, 2,) the.i., K, b, a are filter coefficients, y is filtered data, exceeding k=1, 2,) the.i., x d (K) of the K range, y (K) is replaced by 0 when used for the first time.
The step (4) specifically refers to:
In a power frequency period, the calculation formula of the zero sequence voltage true effective value U T is as follows:
Or alternatively
Taking the frequency as a unit, comparing the zero sequence voltage amplitude U T of each frequency with a voltage starting threshold, and entering a fault processing program if the zero sequence voltage amplitude U T is larger than the voltage starting threshold;
After the fault is started, determining a fault starting point k F: sequentially comparing zero sequence voltage instantaneous values from the previous cycle of fault starting, and determining a point that the amplitude of the first instantaneous value is 1.4 times greater than the voltage starting threshold as a starting point of the fault starting;
When the zero sequence voltage of 2 or more continuous cycles exceeds a threshold, confirming the zero sequence voltage as a ground fault, otherwise, considering transient disturbance; the threshold is an effective value of the set voltage;
the end of the transient disturbance is the second cycle after the fault is started, namely, if the zero sequence voltage exceeds the threshold again from the third cycle, a new fault is considered.
The step (5) specifically refers to:
The fault starting time is based on the time of the fault starting point k F;
After determining the occurrence of the ground fault and the fault starting point k F, firstly determining the fault starting time;
the fault start time is equal to the time from the current moment minus the fault start point k F to the end of the acquisition cycle, and minus the time from the end of the sampling to the current moment.
The step (6) specifically refers to:
Judging a fault phase according to the amplitude and the phase of the power frequency component of each phase voltage of the next cycle after the fault is started; when one phase voltage is smaller than the rated voltage and the other two phases voltage is larger than the rated voltage, the phase with reduced voltage is a fault phase;
when the two-phase voltage is smaller than the rated voltage and the other phase voltage is larger than the rated voltage, the phase with the advanced phase in the two-phase voltage with the reduced amplitude is a fault phase;
wherein the rated voltage corresponds to an input voltage of 57.5V, and the phase lead is in a range of 0 to 180 degrees.
The step (7) specifically refers to:
For the confirmed ground fault, determining that the fault is ended when the duration of the zero sequence voltage amplitude calculated according to the cycle is lower than the starting threshold for more than 1 minute;
if the zero sequence voltage is again greater than the starting threshold within 1 minute, the same fault is considered; after 1 minute, the zero sequence voltage is larger than the starting threshold again, and then a new start is considered;
Determination of a fault end point: and the time corresponding to the cycle of which the last zero sequence voltage is higher than a threshold, namely the time corresponding to the cycle of which the fault is judged to be ended, is retreated forwards for 1 minute, wherein the threshold is an effective value of the set voltage.
In summary, the distributed fault wave recording units distributed on different feeders or at different positions of the feeders are built in the cloud terminal, so that the original data can be effectively processed, and the redundant data is prevented from being uploaded to the cloud terminal. And the data is analyzed and the threshold value is judged, so that the abnormal information is effectively identified, the terminal equipment is converted into a terminal system combined with active analysis and early warning from passive monitoring, the data of the terminal application can be processed in real time at a high speed at the first time, and the timeliness is enhanced.
Claims (1)
1. An edge calculation method based on a distributed fault wave recording unit is characterized by comprising the following steps of: the method comprises the following steps in sequence:
(1) Performing differential compensation on the amplitude and polarity of the instantaneous sampling value of the voltage and current signals of the monitored feeder line;
(2) Synthesizing a zero sequence signal;
(3) Filtering the signals;
(4) Performing fault starting;
(5) Determining a fault starting point;
(6) Calculating a fault phase;
(7) Determining that the fault is ended;
(8) Recording fault data: all data are recorded according to a standard comtgrade data format and named by time;
The step (1) specifically refers to:
Performing amplitude compensation on the instantaneous sampling values of the voltage and current signals; when the amplitude difference between the three-phase and zero-sequence voltage channels/the three-phase and zero-sequence current channels is less than 5%, amplitude compensation is not performed;
Performing polarity compensation on the instantaneous sampling values of the voltage and current signals; when the polarities among the three-phase voltages, the three-phase currents and the voltages and the currents are the same, polarity compensation is not performed;
The step (2) specifically refers to:
the synthesis of the zero sequence current instantaneous value i 0 (k) is carried out, and the synthesis value is i 0 (k) which is 3 times:
i0(k)＝iA(k)+iB(k)+iC(k)
Wherein i A(k)、iB(k)、iC (k) is a sampling value of the phase A, phase B and phase C currents after amplitude and polarity compensation; k=1, 2,3 … …, k is the sampling point;
Synthesizing the zero sequence voltage u 0 (k) with the synthesized value of U 0 (k) times:
wherein u A(k)、uB(k)、uC (k) is the sampling value of the A phase voltage, the B phase voltage and the C phase voltage after amplitude and polarity compensation;
the step (3) specifically refers to: the method comprises the following steps of:
(3a) Filtering the direct current component of the original data x [ k ] to obtain x d [ k ]:
where k=1, 2,) where K, K refers to the kth sample point, K is 256 or 200, 256 or 200 is the number of discrete sample points per cycle;
(3b) Then, carrying out band-pass filtering on x d [ k):
Adopting an IIR digital band-pass filter, wherein the passband frequency is 100Hz < omega <1000Hz, the maximum ripple wave in the passband is 3dB, the minimum attenuation is 30dB when the ripple wave is 50Hz, and the maximum attenuation of the filter is 9 points;
The filtering formula is:
Wherein, k=1, 2,) wherein, K, b, a are filter coefficients, y is filtered data, exceeding k=1, 2,) wherein, x d (K) of the K range, y (K) is replaced by 0 when used for the first time;
the step (4) specifically refers to:
In a power frequency period, the calculation formula of the zero sequence voltage true effective value U T is as follows:
Or alternatively
Taking the frequency as a unit, comparing the zero sequence voltage amplitude U T of each frequency with a voltage starting threshold, and entering a fault processing program if the zero sequence voltage amplitude U T is larger than the voltage starting threshold;
After the fault is started, determining a fault starting point k F: sequentially comparing zero sequence voltage instantaneous values from the previous cycle of fault starting, and determining a point that the amplitude of the first instantaneous value is 1.4 times greater than the voltage starting threshold as a starting point of the fault starting;
When the zero sequence voltage of 2 or more continuous cycles exceeds a threshold, confirming the zero sequence voltage as a ground fault, otherwise, considering transient disturbance; the threshold is an effective value of the set voltage;
the end of the transient disturbance is the second cycle after the fault is started, namely, if the zero sequence voltage exceeds a threshold again from the third cycle, a new fault is considered;
the step (5) specifically refers to:
The fault starting time is based on the time of the fault starting point k F;
After determining the occurrence of the ground fault and the fault starting point k F, firstly determining the fault starting time;
The fault starting time is equal to the time from the current moment minus the fault starting point k F to the time of the cycle end of the collection, and the time from the sampling end to the current moment is subtracted;
the step (6) specifically refers to:
judging a fault phase according to the amplitude and the phase of the power frequency component of each phase voltage of the next cycle after the fault is started;
When one phase voltage is smaller than the rated voltage and the other two phases voltage is larger than the rated voltage, the phase with reduced voltage is a fault phase;
when the two-phase voltage is smaller than the rated voltage and the other phase voltage is larger than the rated voltage, the phase with the advanced phase in the two-phase voltage with the reduced amplitude is a fault phase;
Wherein the rated voltage corresponds to an input voltage of 57.5V, and the phase lead is in a range of 0 to 180 degrees;
The step (7) specifically refers to:
For the confirmed ground fault, determining that the fault is ended when the duration of the zero sequence voltage amplitude calculated according to the cycle is lower than the starting threshold for more than 1 minute;
if the zero sequence voltage is again greater than the starting threshold within 1 minute, the same fault is considered; after 1 minute, the zero sequence voltage is larger than the starting threshold again, and then a new start is considered;
Determination of a fault end point: and the time corresponding to the cycle of which the last zero sequence voltage is higher than a threshold, namely the time corresponding to the cycle of which the fault is judged to be ended, is retreated forwards for 1 minute, wherein the threshold is an effective value of the set voltage.
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| JP2011229316A (en) * | 2010-04-21 | 2011-11-10 | Mitsubishi Electric Corp | Harmonic current compensation apparatus and harmonic current compensation method |
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