CN111123099A - Partial field loss fault identification method for pulse loss - Google Patents

Partial field loss fault identification method for pulse loss Download PDF

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Publication number
CN111123099A
CN111123099A CN201911256344.8A CN201911256344A CN111123099A CN 111123099 A CN111123099 A CN 111123099A CN 201911256344 A CN201911256344 A CN 201911256344A CN 111123099 A CN111123099 A CN 111123099A
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loss
partial
array
fault
excitation
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CN111123099B (en
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郑作伟
揭萍
郝后堂
谭凌
潘书燕
曾炳文
毛俊喜
王焕凤
沈莹
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Nari Technology Co Ltd
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Nari Technology Co Ltd
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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
    • G01R31/34—Testing dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
    • H02H7/065—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors against excitation faults

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a method for identifying a partial loss of excitation fault of pulse loss, which identifies the partial loss of excitation fault of pulse loss by analyzing and comparing the difference between 6 pulse waves in a cycle of excitation voltage, and removes the maximum 10% of data of each pulse wave when performing comparison, thereby reducing the influence of excitation voltage spike on calculation when rectifying and commutation; the minimum 50% of data is removed, so that the sampling data of normal pulse waves without loss pulses are basically large positive values, the average value is not reduced or even close to 0 due to the negative value part of the excitation voltage, the average value of the pulse waves of the loss pulses is generally close to 0 or less than 0, and the pulse waves without the loss pulses have large difference, and the difference is used for identifying the loss-of-excitation fault of the lost part of the pulses.

Description

Partial field loss fault identification method for pulse loss
Technical Field
The invention relates to a method for identifying partial field loss faults of pulse loss, and belongs to the technical field of relay protection of power systems.
Background
As protection against a full loss-of-excitation fault or a partial loss-of-excitation fault with reduced excitation, loss-of-excitation protection is one of the necessary protections for a synchronous motor with an excitation system, such as a generator and a phase modulator.
The pulse loss is one of fault types causing partial magnetic loss faults, and after the pulse loss, the average value of the excitation voltage is reduced to a certain extent due to the reduction of the number of output pulses of the excitation system rectifying circuit. Since the average value of the excitation current is proportional to the average value of the excitation voltage, the average value of the excitation current will also decrease, resulting in a partial demagnetization fault.
The criterion of the excitation loss protection rotor side configured for generator protection or phase modulator protection at present is an excitation low-voltage criterion, the excitation voltage of the excitation loss protection rotor side is accessed in an average value mode, and details of the excitation voltage cannot be collected, so that the current excitation low-voltage criterion can only simply judge the size of the excitation voltage, and cannot judge whether the excitation voltage has a pulse loss fault.
Disclosure of Invention
The invention aims to provide a method for identifying a pulse-loss partial field loss fault, which identifies the pulse-loss partial field loss fault by analyzing and comparing the difference between 6 pulse waves in one cycle of an excitation voltage.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the embodiment of the invention provides a method for identifying a pulse loss partial field loss fault, which comprises the following steps:
sampling the analog quantity of the loss-of-magnetization protection device;
taking the data of N/6 points before the sampling point N to form an array E1(ii) a Wherein N is the number of sampling points;
handle array E1The middle data is sorted from big to small, and the sorted array is recorded as E2；
Handle array E2Removing several data from head and tail to form a new array E3；
Compute array E3Average value of all the data as the average value E of the sampling points nf(N) and calculating the average value of the sampling points N pushing k × N/6 sampling points forward, wherein k is 0,1,2,3,4, 5;
calculating a partial loss of field determination value from the calculated average value:
and comparing the partial loss of magnetism judgment value with a partial loss of magnetism threshold fixed value, and identifying partial loss of magnetism faults.
Further, the sampling an analog quantity of the loss-of-magnetization protection device includes:
sampling the analog quantity of the loss-of-magnetization protection device at equal intervals, and collecting N points for each analog quantity at each cycle, wherein N is an integral multiple of 60.
Further, the analog quantity is an excitation voltage, and the excitation voltage is accessed in an instantaneous value mode.
Further, the handle array E2Removing several data from head and tail to form a new array E3The method comprises the following steps:
handle array E2The data in (1) is removed from the data in the array from the maximum value to 10% of the total data number in the array from the back, and then removed from the data in the array from the minimum value to 50% of the total data number in the array from the front, and the rest data form a new array E3。
Further, the calculating a partial demagnetization determination value based on the calculated average value includes:
Efd(n)＝[Efmax(n)-Efmin(n)]/Efmax(n)
wherein E isfd(n) is a moietyDetermination of value by loss of magnetism, Efmax(n) and Efmin(n) are each Ef(N-k × N/6), k is 0, maximum and minimum values among the average values of 6 points of 1,2,3,4,5, Ef(N-k N/6) represents the average of the sampled points N-k N/6.
Further, the comparing the partial demagnetization judgment value with the partial demagnetization threshold fixed value to identify the partial demagnetization fault includes:
judgment Efd(n) is greater than EsetWhether or not duration of (a) is greater than tsetIf so, judging the fault as a partial loss of excitation fault of the lost pulse, otherwise, not judging the fault as the partial loss of excitation fault of the lost pulse, wherein EsetFor partial demagnetization threshold setting, tsetIs time-fixed.
The invention has the beneficial effects that:
according to the embodiment of the invention, the excitation voltage is connected into the device in an instantaneous value mode, so that the protection device can acquire the waveform data of the whole excitation voltage.
In the embodiment of the invention, partial loss-of-field faults of pulse loss are identified by analyzing and comparing the difference between 6 pulse waves in a cycle of excitation voltage, and for the data of each pulse wave, the maximum 10% of data is removed, so that the influence of the excitation voltage spike on calculation during commutation and commutation can be reduced; the minimum 50% of data is removed, so that the sampling data of normal pulse waves without lost pulses are basically large positive values, the average value is not reduced or even close to 0 due to the negative value part of the excitation voltage, the average value of the pulse waves of the lost pulses is generally close to 0 or less than 0, and the pulse waves without the lost pulses have large difference, and the partial loss-of-magnetization fault of the pulse loss can be identified by using the difference.
Drawings
Fig. 1 is a flow chart of partial loss of field fault identification of pulse loss according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The embodiment of the invention provides a method for identifying a pulse loss partial field loss fault, which comprises the following steps:
partial demagnetization threshold fixed value E is set in protection device where demagnetization protection is positionedsetAnd a time constant tsetSampling the analog quantity at equal intervals, collecting N points for each analog quantity at each cycle, wherein N is an integral multiple of 60, and executing the following steps at each sampling point N:
in the embodiment of the invention, the excitation voltage is sampled as an example, the excitation voltage is accessed in an instantaneous value mode, the excitation voltage is sampled, and the sampling value is marked as E (n).
Using E (N) data of N/6 points before the current point, and recording the array formed by the data of the N/6 points as E1。
Handle array E1The middle data is sorted from big to small, and the sorted array is recorded as E2。
Handle array E2Removing the data of 10% of total data from maximum value, removing the data of 50% of total data from minimum value, and forming a new array E3Calculated, known as data E3There are N/15 data.
Compute array E3The average value of all the data is recorded as the average value E of the sampling points nf(N) and calculating the average of the samples N pushed k × N/6 samples, k being 0,1,2,3,4, 5.
Calculating a partial loss of field determination value from the calculated average value:
Efd(n)＝[Efmax(n)-Efmin(n)]/Efmax(n)
wherein E isfmax(n) and Efmin(n) are each Ef(N-k × N/6), k is 0,1,2,3,4,5, the maximum and minimum values among the average values of the 6 points.
Judgment Efd(n) is greater than EsetWhether or not duration of (a) is greater than tsetIf so, judging the fault as a partial loss of excitation fault of the lost pulse, otherwise, not judging the fault as the partial loss of excitation fault of the lost pulse.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.

Claims (6)

1. A partial loss of field fault identification method of pulse loss is characterized by comprising the following steps:
sampling the analog quantity of the loss-of-magnetization protection device;
taking the data of N/6 points before the sampling point N to form an array E1(ii) a Wherein N is the number of sampling points;
handle array E1The middle data is sorted from big to small, and the sorted array is recorded as E2；
Handle array E2Removing several data from head and tail to form a new array E3；
Compute array E3Average value of all the data as the average value E of the sampling points nf(N) and calculating the average value of the sampling points N pushing k × N/6 sampling points forward, wherein k is 0,1,2,3,4, 5;
calculating a partial loss of field determination value from the calculated average value:
and comparing the partial loss of magnetism judgment value with a partial loss of magnetism threshold fixed value, and identifying partial loss of magnetism faults.
2. The method for identifying the partial loss of excitation fault of pulse loss according to claim 1, wherein the sampling of the analog quantity of the loss of excitation protection device comprises:
sampling the analog quantity of the loss-of-magnetization protection device at equal intervals, and collecting N points for each analog quantity at each cycle, wherein N is an integral multiple of 60.
3. The method for identifying the partial field loss fault of the pulse loss according to claim 2, wherein the analog quantity is an excitation voltage, and the excitation voltage is connected in an instantaneous value mode.
4. A method for identifying a partial loss of field fault with pulse loss according to claim 1, wherein said array E is defined as2Removing several data from head and tail to form a new array E3The method comprises the following steps:
handle array E2The data in (1) is removed from the data in the array from the maximum value to 10% of the total data number in the array from the back, and then removed from the data in the array from the minimum value to 50% of the total data number in the array from the front, and the rest data form a new array E3。
5. The method for identifying the pulse loss partial demagnetization fault according to claim 1, wherein the step of calculating the partial demagnetization judgment value according to the calculated average value comprises the following steps:
Efd(n)＝[Efmax(n)-Efmin(n)]/Efmax(n)
wherein E isfd(n) is a partial demagnetization judgment value, Efmax(n) and Efmin(n) are each Ef(N-k × N/6), k is 0, maximum and minimum values among the average values of 6 points of 1,2,3,4,5, Ef(N-k N/6) represents the average of the sampled points N-k N/6.
6. The method for identifying a partial loss of excitation fault of pulse loss according to claim 5, wherein the step of comparing the partial loss of excitation determination value with the partial loss of excitation threshold determination value to identify the partial loss of excitation fault comprises:
judgment Efd(n) is greater than EsetWhether or not duration of (a) is greater than tsetIf so, judging the fault as a partial loss of excitation fault of the lost pulse, otherwise, not judging the fault as the partial loss of excitation fault of the lost pulse, wherein EsetFor partial demagnetization threshold setting, tsetIs time-fixed.
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CN113964964A (en) * 2021-11-15 2022-01-21 西安热工研究院有限公司 Permanent magnet demagnetization fault simulation device of permanent magnet wind driven generator based on electric signals

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CN113964964B (en) * 2021-11-15 2023-03-21 西安热工研究院有限公司 Permanent magnet demagnetization fault simulation device of permanent magnet wind driven generator based on electric signals

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