CN114002555A - Edge calculation method based on distributed fault recording unit - Google Patents
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Abstract
The invention relates to an edge calculation method based on a distributed fault recording unit, which comprises the following steps in sequence: carrying out difference compensation on the amplitude and the polarity of the voltage and current signal instantaneous sampling values of the monitored feeder line; synthesizing a zero sequence signal; carrying out signal filtering; carrying out fault starting; determining a fault starting point; calculating a fault phase; finishing the fault; all data is recorded in the standard Comtrade data format and named in time. The invention is internally provided with the distributed fault recording units distributed on different feeder lines or 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 applied by the terminal can be processed at the first time in real time at a high speed, and the timeliness is enhanced.
Description
Technical Field
The invention relates to the technical field of power system fault recording, in particular to an edge calculation method based on a distributed fault recording unit.
Background
The dynamic recording device for the faults of the power system is widely applied to substations of 110kV and above and used for recording the whole process of various faults, various parameters and derived quantities thereof and related non-electric quantity changes in the power system. However, for 35kV or 10kV lines, a fault dynamic recording device is not equipped at present.
Patent application No. 201510413369.X, patent name is based on the fault monitoring device of distributed record wave, provides a fault monitoring device based on distributed record wave, and the main use lies in can carrying out real-time supervision to electric current and voltage on the line to record the wave, can carry out steady state and transient state data analysis simultaneously. No specific algorithm is proposed.
The patent with the patent application number of 201610168937.9 and the patent name of a wide-area fault wave recording system and a synchronization method proposes that a general network with longer communication delay is used for wide-area cross-station synchronous wave recording so as to meet the wide-area synchronous wave recording requirements required by strong association systems 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 power distribution network single-phase earth fault positioning device and method based on edge calculation, the problem to be solved is to quickly find the wave head of a fault waveform, and simultaneously, a high-precision time synchronization mechanism is utilized to send the wave head of each measuring point to a positioning calculation module of a power distribution network automation main station for fault positioning by a convergence module of each measuring point measuring device. However, no specific criteria and algorithms for measuring point measuring devices are described.
Disclosure of Invention
The invention aims to provide an edge calculation method based on distributed fault recording units, which is used for respectively recording waves by a plurality of distributed fault recording units distributed on different feeder lines or different positions of the feeder lines, analyzing, processing and comprehensively judging data according to a configured edge calculation method, and then storing or uploading the data according to the result, thereby reducing bandwidth pressure and enhancing the real-time performance of terminal processing.
In order to achieve the purpose, the invention adopts the following technical scheme: an edge calculation method based on a distributed fault recording unit comprises the following steps:
(1) carrying out difference compensation on the amplitude and the polarity of the voltage and current signal instantaneous sampling values of the monitored feeder line;
(2) synthesizing a zero sequence signal;
(3) carrying out signal filtering;
(4) carrying out fault starting;
(5) determining a fault starting point;
(6) calculating a fault phase;
(7) determining that the fault is over;
(8) recording fault data: all data is recorded in the standard Comtrade data format and named in time.
The step (1) specifically comprises the following steps:
carrying out amplitude compensation on 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;
carrying out polarity compensation on the instantaneous sampling values of the voltage and current signals; when the polarities between three-phase voltages, three-phase currents, and between voltages and currents are the same, polarity compensation is not performed.
The step (2) specifically comprises the following steps:
carrying out zero sequence current instantaneous value i0(k) Synthesis of i with a 3-fold synthesis value0(k)：
i0(k)＝iA(k)+iB(k)+iC(k)
Wherein iA(k)、iB(k)、iC(k) Respectively sampling values of A-phase current, B-phase current and C-phase current after amplitude and polarity compensation; k is 1,2,3 … …, k is the sample point;
carrying out zero sequence voltage u0(k) Having a composition value of
Multiple of u0(k)：
Wherein u isA(k)、uB(k)、uC(k) The sampling values of A phase voltage, B phase voltage and C phase voltage after amplitude and polarity compensation are respectively obtained.
The step (3) specifically comprises the following steps: the method comprises the following steps of performing digital filtering on the determined voltage and current recording data, and filtering low-frequency quantity and high-frequency quantity including power frequency quantity, wherein the method specifically comprises the following steps:
(3a) the original data x [ k ]]Firstly filtering out DC component to obtain xd[k]：
Wherein K1, 2, the.. K, K refers to the kth sampling point, and K is 256 or 200, and 256 or 200 is the number of discrete sampling points per cycle;
(3b) then x is putd[k]Performing band-pass filtering:
an IIR digital band-pass filter is adopted, the pass-band frequency is 100Hz < omega <1000Hz, the maximum ripple wave in the pass-band is 3dB, the minimum attenuation is 30dB at 50Hz, and the longest filter is 9 points;
the filter formula is:
wherein, K1, 2, thed(k) And y (k) are each replaced by 0 when used for the first time.
The step (4) specifically comprises the following steps:
within a power frequency period, the zero sequence voltage true effective value UTThe calculation formula of (a) is as follows:
or
Comparing the zero sequence voltage amplitude U of each cycle by taking the cycle as a unitTAnd a voltage starting threshold, and if the voltage starting threshold is larger than the voltage starting threshold, entering a fault processing program;
after the fault is started, the fault starting point kFDetermination of (1): comparing the zero sequence voltage instantaneous values in sequence from the previous cycle of the fault starting, and the amplitude value of the first instantaneous value>Determining a point of 1.4 times of 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, determining the zero sequence voltage as a ground fault, otherwise, considering transient disturbance; the threshold is an effective value of a 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 comprises the following steps:
the failure starting time is the failure starting point kFThe time of (2) is standard;
in determining the occurrence of a ground fault and the starting point k of the faultFFirstly, determining the starting time of the fault;
the failure starting time is equal to the current moment minus the failure starting point kFThe time to the end of the acquisition cycle is subtracted by the current time to the end of the sampling.
The step (6) specifically comprises the following steps:
judging a fault phase according to the amplitude and the phase of each phase voltage power frequency component of the next cycle after the fault is started; when one phase voltage is less than the rated voltage and the other two phases are more than the rated voltage, the phase with the 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 phase advance 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 advance ranges from 0 to 180 degrees.
The step (7) specifically comprises the following steps:
for the confirmed ground fault, if the duration time that the zero sequence voltage amplitude calculated according to the cycle is lower than the starting threshold exceeds 1 minute, the fault is determined to be ended;
if the zero sequence voltage is larger than the starting threshold again within 1 minute, the same fault is considered; after 1 minute, the zero sequence voltage is larger than the starting threshold again, and a new start is considered;
determination of the fault end point: and the time corresponding to the cycle with the last zero-sequence voltage higher than the threshold, namely the time corresponding to the cycle with the fault end is judged to move back for 1 minute, wherein the threshold is the effective value of the set voltage.
According to the technical scheme, the beneficial effects of the invention are as follows: the invention is internally provided with the distributed fault recording units distributed on different feeder lines or 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 applied by the terminal can be processed at the first time in real time at a high speed, 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 steps:
(1) carrying out difference compensation on the amplitude and the polarity of the voltage and current signal instantaneous sampling values of the monitored feeder line;
(2) synthesizing a zero sequence signal;
(3) carrying out signal filtering;
(4) carrying out fault starting;
(5) determining a fault starting point;
(6) calculating a fault phase;
(7) determining that the fault is over;
(8) recording fault data: all data is recorded in the standard Comtrade data format and named in time.
The step (1) specifically comprises the following steps:
carrying out amplitude compensation on 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;
carrying out polarity compensation on the instantaneous sampling values of the voltage and current signals; when the polarities between three-phase voltages, three-phase currents, and between voltages and currents are the same, polarity compensation is not performed.
The step (2) specifically comprises the following steps:
carrying out zero sequence current instantaneous value i0(k) Synthesis of i with a 3-fold synthesis value0(k)：
i0(k)＝iA(k)+iB(k)+iC(k)
Wherein iA(k)、iB(k)、iC(k) Respectively sampling values of A-phase current, B-phase current and C-phase current after amplitude and polarity compensation; k is 1,2,3 … …, k is the sample point;
carrying out zero sequence voltage u0(k) Having a composition value of
Multiple of u0(k)：
Wherein u isA(k)、uB(k)、uC(k) Respectively an A phase voltage, a B phase voltage and a C phase voltageAnd sampling values after amplitude and polarity compensation.
The step (3) specifically comprises the following steps: the method comprises the following steps of performing digital filtering on the determined voltage and current recording data, and filtering low-frequency quantity and high-frequency quantity including power frequency quantity, wherein the method specifically comprises the following steps:
(3a) the original data x [ k ]]Firstly filtering out DC component to obtain xd[k]：
Wherein K1, 2, the.. K, K refers to the kth sampling point, and K is 256 or 200, and 256 or 200 is the number of discrete sampling points per cycle;
(3b) then x is putd[k]Performing band-pass filtering:
an IIR digital band-pass filter is adopted, the pass-band frequency is 100Hz < omega <1000Hz, the maximum ripple wave in the pass-band is 3dB, the minimum attenuation is 30dB at 50Hz, and the longest filter is 9 points;
the filter formula is:
wherein, K1, 2, thed(k) And y (k) are each replaced by 0 when used for the first time.
The step (4) specifically comprises the following steps:
within a power frequency period, the zero sequence voltage true effective value UTThe calculation formula of (a) is as follows:
or
Comparing the zero sequence voltage amplitude U of each cycle by taking the cycle as a unitTAnd electricityPressing a starting threshold, and entering a fault processing program if the starting threshold is larger than the threshold;
after the fault is started, the fault starting point kFDetermination of (1): comparing the zero sequence voltage instantaneous values in sequence from the previous cycle of the fault starting, and the amplitude value of the first instantaneous value>Determining a point of 1.4 times of 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, determining the zero sequence voltage as a ground fault, otherwise, considering transient disturbance; the threshold is an effective value of a 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 comprises the following steps:
the failure starting time is the failure starting point kFThe time of (2) is standard;
in determining the occurrence of a ground fault and the starting point k of the faultFFirstly, determining the starting time of the fault;
the failure starting time is equal to the current moment minus the failure starting point kFThe time to the end of the acquisition cycle is subtracted by the current time to the end of the sampling.
The step (6) specifically comprises the following steps:
judging a fault phase according to the amplitude and the phase of each phase voltage power frequency component of the next cycle after the fault is started; when one phase voltage is less than the rated voltage and the other two phases are more than the rated voltage, the phase with the 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 phase advance 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 advance ranges from 0 to 180 degrees.
The step (7) specifically comprises the following steps:
for the confirmed ground fault, if the duration time that the zero sequence voltage amplitude calculated according to the cycle is lower than the starting threshold exceeds 1 minute, the fault is determined to be ended;
if the zero sequence voltage is larger than the starting threshold again within 1 minute, the same fault is considered; after 1 minute, the zero sequence voltage is larger than the starting threshold again, and a new start is considered;
determination of the fault end point: and the time corresponding to the cycle with the last zero-sequence voltage higher than the threshold, namely the time corresponding to the cycle with the fault end is judged to move back for 1 minute, wherein the threshold is the effective value of the set voltage.
In summary, the distributed fault recording units distributed on different feeder lines or different positions of the feeder lines are built in the system, so that the original data can be effectively processed, and redundant data are prevented from being uploaded 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 applied by the terminal can be processed at the first time in real time at a high speed, and the timeliness is enhanced.
Claims (8)
1. An edge calculation method based on a distributed fault recording unit is characterized in that: the method comprises the following steps in sequence:
(1) carrying out difference compensation on the amplitude and the polarity of the voltage and current signal instantaneous sampling values of the monitored feeder line;
(2) synthesizing a zero sequence signal;
(3) carrying out signal filtering;
(4) carrying out fault starting;
(5) determining a fault starting point;
(6) calculating a fault phase;
(7) determining that the fault is over;
(8) recording fault data: all data is recorded in the standard Comtrade data format and named in time.
2. The edge calculation method based on the distributed fault recording unit according to claim 1, wherein: the step (1) specifically comprises the following steps:
carrying out amplitude compensation on 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;
carrying out polarity compensation on the instantaneous sampling values of the voltage and current signals; when the polarities between three-phase voltages, three-phase currents, and between voltages and currents are the same, polarity compensation is not performed.
3. The edge calculation method based on the distributed fault recording unit according to claim 1, wherein: the step (2) specifically comprises the following steps:
carrying out zero sequence current instantaneous value i0(k) Synthesis of i with a 3-fold synthesis value0(k)：
i0(k)＝iA(k)+iB(k)+iC(k)
Wherein iA(k)、iB(k)、iC(k) Respectively sampling values of A-phase current, B-phase current and C-phase current after amplitude and polarity compensation; k is 1,2,3 … …, k is the sample point;
carrying out zero sequence voltage u0(k) Having a composition value of
Multiple of u0(k)：
Wherein u isA(k)、uB(k)、uC(k) The sampling values of A phase voltage, B phase voltage and C phase voltage after amplitude and polarity compensation are respectively obtained.
4. The edge calculation method based on the distributed fault recording unit according to claim 1, wherein: the step (3) specifically comprises the following steps: the method comprises the following steps of performing digital filtering on the determined voltage and current recording data, and filtering low-frequency quantity and high-frequency quantity including power frequency quantity, wherein the method specifically comprises the following steps:
(3a) the original data x [ k ]]Firstly filtering out DC component to obtain xd[k]：
Wherein K1, 2, the.. K, K refers to the kth sampling point, and K is 256 or 200, and 256 or 200 is the number of discrete sampling points per cycle;
(3b) then x is putd[k]Performing band-pass filtering:
an IIR digital band-pass filter is adopted, the pass-band frequency is 100Hz < omega <1000Hz, the maximum ripple wave in the pass-band is 3dB, the minimum attenuation is 30dB at 50Hz, and the longest filter is 9 points;
the filter formula is:
wherein, K1, 2, thed(k) And y (k) are each replaced by 0 when used for the first time.
5. The edge calculation method based on the distributed fault recording unit according to claim 1, wherein: the step (4) specifically comprises the following steps:
within a power frequency period, the zero sequence voltage true effective value UTThe calculation formula of (a) is as follows:
or
Comparing the zero sequence voltage amplitude U of each cycle by taking the cycle as a unitTAnd a voltage starting threshold, if the voltage starting threshold is larger than the threshold, entering a fault positionProcessing the program;
after the fault is started, the fault starting point kFDetermination of (1): comparing the zero sequence voltage instantaneous values in sequence from the previous cycle of the fault starting, and the amplitude value of the first instantaneous value>Determining a point of 1.4 times of 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, determining the zero sequence voltage as a ground fault, otherwise, considering transient disturbance; the threshold is an effective value of a 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.
6. The edge calculation method based on the distributed fault recording unit according to claim 1, wherein: the step (5) specifically comprises the following steps:
the failure starting time is the failure starting point kFThe time of (2) is standard;
in determining the occurrence of a ground fault and the starting point k of the faultFFirstly, determining the starting time of the fault;
the failure starting time is equal to the current moment minus the failure starting point kFThe time to the end of the acquisition cycle is subtracted by the current time to the end of the sampling.
7. The edge calculation method based on the distributed fault recording unit according to claim 1, wherein: the step (6) specifically comprises the following steps:
judging a fault phase according to the amplitude and the phase of each phase voltage power frequency component of the next cycle after the fault is started;
when one phase voltage is less than the rated voltage and the other two phases are more than the rated voltage, the phase with the 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 phase advance 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 advance ranges from 0 to 180 degrees.
8. The edge calculation method based on the distributed fault recording unit according to claim 1, wherein: the step (7) specifically comprises the following steps:
for the confirmed ground fault, if the duration time that the zero sequence voltage amplitude calculated according to the cycle is lower than the starting threshold exceeds 1 minute, the fault is determined to be ended;
if the zero sequence voltage is larger than the starting threshold again within 1 minute, the same fault is considered; after 1 minute, the zero sequence voltage is larger than the starting threshold again, and a new start is considered;
determination of the fault end point: and the time corresponding to the cycle with the last zero-sequence voltage higher than the threshold, namely the time corresponding to the cycle with the fault end is judged to move back for 1 minute, wherein the threshold is the effective value of the set voltage.
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| CN114518536A (en) * | 2022-04-21 | 2022-05-20 | 成都工百利自动化设备有限公司 | Method for monitoring state of high-voltage motor |
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