CN110535091A - A kind of Microcomputer Protection method and apparatus adapting to electrical equipment frequency property - Google Patents
A kind of Microcomputer Protection method and apparatus adapting to electrical equipment frequency property Download PDFInfo
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- CN110535091A CN110535091A CN201910734556.6A CN201910734556A CN110535091A CN 110535091 A CN110535091 A CN 110535091A CN 201910734556 A CN201910734556 A CN 201910734556A CN 110535091 A CN110535091 A CN 110535091A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Artificial Intelligence (AREA)
- Evolutionary Computation (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention discloses a kind of Microcomputer Protection method and apparatus for adapting to electrical equipment frequency property, and method includes: to obtain equipment operation sampled data；The currently practical frequency of equipment is calculated according to sampled data；According to fixed frequency and equipment actual frequency, sampled data is corrected, obtains power frequency correction data；According to preset protection calculating and sampled data selection rule, multinomial protection calculating is carried out based on power frequency correction data or original sampling data, and according to protection calculating as a result, controlling protection act executing agency executes protection act.Frequency shift (FS) bring can be reduced using the present invention and calculate error, so that equipment, during variable frequency starting, Microcomputer Protection can obtain reliable unit electrical quantity delta data, and then ensure that protection calculates the reliability with logic judgment.
Description
Technical field
The present invention relates to the Microcomputer Protection technical fields of the electrical equipments such as gas turbine group, pump-storage generator, especially
A kind of Microcomputer Protection method and apparatus adapting to electrical equipment frequency property.
Background technique
During startup, Current Voltage frequency is variation, and conventional electric power generation for gas turbine group and pump-storage generator
Machine protection algorism is designed based on power frequency, when electrical quantity frequency shift (FS) power frequency, will be generated biggish calculating error, and be worked as offset
When bigger, it is bigger to calculate error.
The generator protection algorithm for adapting to the variation of electrical quantity frequency at present mainly has:
(1) frequency tracking algorithm
Protective device adjusts hardware sample frequency according to the variation of system electrical amount frequency, so that phase between two sampled points
Potential difference and electrical quantity frequency are essentially identical when being power frequency, so can be calculated using traditional protection algorism.This algorithm
It can effectively improve computational accuracy when electrical quantity frequency shift (FS), but also bring along some problems, comprising:
A, the frequency protection and over-excitation protection calculated value calculated using sampled point is unable to the variation of response frequency；
B, protective device recording does not react the variation of frequency.
(2) integral algorithm
This algorithm is unrelated with the calculating of electrical quantity frequency, directlys adopt zero passage integral algorithm and calculates electrical quantity virtual value, separately
Differential protection difference current and stalling current can be calculated outside, but cannot calculate the positive-sequence component and negative sequence component of electrical quantity.
(3) changing data window algorithm
This algorithm calculates frequency first, and the length of data window is then calculated according to frequency meter.As protective device sample frequency is
1200Hz, current electrical quantity frequency are 40Hz, then the length of data window is that sampling number is 1200/40=30 in a cycle
It is a, electrical quantity virtual value is then calculated using full wave Fourier algorithm.But since electrical quantity frequency is there are drift condition, cause to change
Data window cannot precisely be corresponded to electrical quantity actual cycle, that is, in a cycle, the points of data window are not necessarily whole
Number, such as current electrical quantity frequency are 47Hz, then points are 1200/47=25.53, then cause to calculate error, electrical quantity frequency
Rate offset is bigger, and it is bigger to calculate error.
Summary of the invention
It is an object of the present invention to provide a kind of Microcomputer Protection method and apparatus for adapting to electrical equipment frequency property, reduce
Frequency shift (FS) bring calculates error, so that equipment, during variable frequency starting, Microcomputer Protection can obtain reliable unit electricity
Tolerance delta data, and then ensure that protection calculates the reliability with logic judgment.
The technical scheme adopted by the invention is as follows: a kind of Microcomputer Protection method adapting to electrical equipment frequency property, comprising:
It obtains equipment and runs sampled data；
The currently practical frequency of equipment is calculated according to sampled data；
According to equipment rated frequency and equipment actual frequency, sampled data is corrected, obtains power frequency correction data；
Calculated according to preset protection and sampled data selection rule, based on power frequency correction data or original sampling data into
The multinomial protection of row calculates, and according to protection calculating as a result, control protection act executing agency executes protection act.
Calculating the currently practical frequency of equipment according to sampled data can be used existing frequency measurement algorithm.The present invention is applying
When, a data window is obtained respectively to the sampling of every wheel of equipment operating data, to the correction of sampled data also according to obtained
Data window successively persistently carries out, so as to the variation of tracking equipment actual frequency.
Preferably, the equipment operation sampled data is to acquire according to default fixed frequency, and equipment is during startup
System voltage and current data；
Sampled data is corrected according to preset data points, obtains the power frequency correction data of corresponding data points.
Equipment can be, but not limited to, gas turbine or pump-storage generator etc..
It is pre- that the fixed sampling frequency setting of equipment operating data should make the sampled data window length an of cycle be greater than
If data points, preset data points set according to needed for protection algorism.Since the present invention does not use changing data window algorithm,
And the power frequency correction data that the data by obtaining to sampling are corrected to obtain specified data point is calculated for protection algorism, is come
It avoids calculating deviation caused by electrical quantity frequency shift (FS), therefore sample frequency can not also do the limitation whether fixed, need to only obtain
Greater than the sampled data window of preset data points.
Further, the invention also includes store original sampling data and power frequency correction data to different memory areas respectively
Domain.Difference protection is calculated execution module and is corrected using the original sampling data or power frequency of data source pointer reading respective memory regions
Data.
Preferably, sampled data is corrected and includes:
It determines correction reference data point, is denoted as X0, with X0Sampled data window for correction reference data point is [X0,
X1......XN-1]；
Assuming that the currently practical frequency of equipment is F1, required power frequency correction data is M, then power frequency correction data Xj' are as follows:
In formula,Counting period Δ f=j*F between target correction sampled point and actual samples point0-i*
F1, F0For system power voltagerating frequency, F1For system power voltage actual frequency, INT () is indicated to the parameter in bracket
It is rounded；p(F1) it is predetermined correction data frequency compensation coefficient.
Above-mentioned correction reference data point can be any point in a sampling period corresponding original sampling data, institute
The number of the power frequency correction data M needed is determined according to algorithm needs in protection calculating, i.e., aforementioned preset data points, school
The selection of positive benchmark data point should meet so that corresponding sampled data window length is greater than M.
Preferably, the correction data frequency compensation coefficient are as follows:
p(F1)=m1*F1+m2
In formula, the proportionality coefficient m of frequency compensation coefficient1With intercept m2Determination method include:
Apply current or voltage, frequency 50Hz, amplitude A0 in AC sampling channel with relay-protection tester；
Maintain application current or voltage amplitude A0 constant, change frequency is F11, protective device display amplitude is A1, then has frequency
Rate F11Under correction data frequency compensation coefficient are as follows:
Maintain application current or voltage amplitude A0 constant, changing frequency again is F12, protective device display amplitude is A2, then
There is F12Under little Zheng data frequency penalty coefficient are as follows:
Based on known A0, A1 and A2, following equation group is solved:
Obtain parameter m1With m2Value.
Preferably, preset protection of the present invention calculates and sampled data selection rule includes:
When the currently practical frequency of equipment is less than first frequency setting value, it is latched other guarantors in addition to startup over-current protection
Protect computing function；
When the currently practical frequency of equipment be greater than first frequency setting value and be less than second frequency setting value, or be greater than third frequency
When rate setting value, protection calculating is carried out using power frequency correction data；
When the currently practical frequency of equipment, which is greater than or equal to second frequency setting value, is less than third frequency setting value, using original
Beginning sampled data carries out protection calculating；
The first frequency setting value, second frequency setting value, third frequency setting value are sequentially increased；
Including injected type stator ground protection module, triple-frequency harmonics protective module, rotor earth fault protection module, frequency anomaly
The special protection of protective module and over-excitation protection module calculates and startup over-current protection calculates, only with crude sampling number
According to progress；
Recording is protected to use original sampling data.
Preferably, the first/bis-/tri- frequency setting value is 10Hz/49.5Hz/50.5Hz.Specific value can be corresponding
It slightly floats value two sides.
Invention additionally discloses a kind of microcomputer protecting devices for adapting to electrical equipment frequency property, comprising:
Equipment operating data obtains module, for obtaining equipment operation sampled data；
Equipment actual frequency computing module, for calculating the currently practical frequency of equipment according to sampled data；
Sampled data correction module, for being corrected, obtaining to sampled data according to fixed frequency and equipment actual frequency
To power frequency correction data；
And protection calculates and control output module, is used for according to preset protection calculating and sampled data selection rule,
Multinomial protection calculating is carried out based on power frequency correction data or original sampling data, and is protected according to what protection calculated as a result, controlling
Action actuating mechanism executes protection act.
Preferably, microcomputer protecting device further includes data memory module, and data memory module includes original sampling data area
With correction data area；The equipment operating data is deposited in original sampling data area, and the power frequency correction data deposits in school
Correction data area.On this basis, modularized design, original sampling data area and correction data area can be used in all types of protection calculating
Data pass through data source pointer respectively and pass to each protection computing module, then each protection computing module is further according to frequency
Size and preset sampled data selection rule carry out calculate data source switching, then carry out protection calculate and logic sentence
It is disconnected.
Beneficial effect
The present invention carries out algorithm correction to original sample point by calculating measurement frequency first, further according to the size of frequency,
Each protective module can voluntarily select protection to calculate data source, energy according to the specific demand of electrical quantity frequency and protective module itself
It effectively solves frequency shift (FS) bring and calculates error, the positive-sequence component and negative sequence component of electrical quantity are computed correctly, using the present invention
Frequency protection and over-excitation protection calculated value energy response frequency variation, protective device electrical quantity recording can correctly reflect frequency
Variation.
Detailed description of the invention
Fig. 1 show the method for the present invention schematic diagram；
Fig. 2 show a kind of specific embodiment flow diagram of the method for the present invention；
Generator terminal three-phase current recording schematic diagram when Fig. 3 is hydroenergy storage station pumped storage unit SFC starting；
Generator terminal three-phase voltage recording schematic diagram when Fig. 4 is certain hydroenergy storage station pumped storage unit SFC starting.
Specific embodiment
It is further described below in conjunction with the drawings and specific embodiments.
Embodiment 1
The present embodiment is a kind of Microcomputer Protection method for adapting to electrical equipment frequency property, includes: with reference to shown in Fig. 1
It obtains equipment and runs sampled data；
The currently practical frequency of equipment is calculated according to sampled data；
According to equipment rated frequency and equipment actual frequency, sampled data is corrected, obtains power frequency correction data；
Calculated according to preset protection and sampled data selection rule, based on power frequency correction data or original sampling data into
The multinomial protection of row calculates, and according to protection calculating as a result, control protection act executing agency executes protection act.
The equipment operation sampled data is the data sampled based on fixed sampling frequency, which can
It needs to set according to protection algorism, so that the sampled data number in the single sampling period, and the power frequency correction after correction
The points of data needed for data amount check can satisfy protection algorism.Calculating the currently practical frequency of equipment according to sampled data can be used
Existing frequency measurement algorithm.
In use, every wheel sampling to equipment operating data obtains a data window respectively, the correction to sampled data
Also it is successively persistently carried out according to obtained data window, so that the variation of equipment actual frequency can be obtained.
Refering to what is shown in Fig. 2, the present embodiment is specifically related to following steps:
Step 1, setting internal storage data divide into original sampling data area and correction data area；
Step 2 acquires Fig. 3 and device systems Current Voltage shown in Fig. 4 using fixed frequency, will each collected number
It is deposited in original sampling data area according to the sampled data in window；
Step 3, each data window data for obtaining, are utilized respectively existing Frequency Measurement Algorithm calculation system Current Voltage
Actual frequency；
Step 4, according to system nominal frequency and actual frequency, the sampled data of current data window is turned using correcting algorithm
It is changed to power frequency correction data, and is deposited in correction data area；
When carrying out Data correction, it is assumed that N number of sampled data points of current data window are as follows: X0,X1......XN-1, use is soft
Part Frequency Measurement Algorithm calculates current electrical quantity frequency F1, the data point number for needing to correct is M, then:
(1) with sampled point X0As base value strong point, without correction；
(2) corrected data are as follows:
In formula: j≤M < N, j ≠ 0；Δ f=j*F0-i*F1, F0For system power voltagerating frequency
Rate, F1For system power voltage actual frequency, INT indicates to be rounded；
p(F1) it is correction data frequency compensation coefficient, p (F1)=m1*F1+m2；
p(F1) with system actual frequency F1Variation and change；m1、m2It is obtained by actual measurement.
Above-mentioned parameter m1、m2Steps are as follows for survey calculation:
Apply current or voltage, frequency 50Hz, amplitude A0 in AC sampling channel with relay-protection tester；
Maintain application current or voltage amplitude A0 constant, change frequency is F11, protective device display amplitude is A1, then has frequency
Rate F11Under correction data frequency compensation coefficient are as follows:
Maintain application current or voltage amplitude A0 constant, changing frequency again is F12, protective device display amplitude is A2, then
There is F12Under little Zheng data frequency penalty coefficient are as follows:
Based on known A0, A1 and A2, following equation group is solved:
Obtain parameter m1With m2Value.
The data source pointer of counted system actual frequency and sampled data is passed to each relay protective scheme meter by step 5
Calculate software module；
Step 6, each protection software for calculation module switch according to the selection that the size of actual frequency calculate data source,
Protection calculating and logic judgment are carried out again, specific:
(1) each to protect the locking of computing module function when frequency is less than 10Hz；
(2), when frequency is greater than 10Hz and is less than 49.5Hz or frequency greater than 50.5Hz, using correction data area data
Carry out protection calculating；
(3), when frequency, which is more than or equal to 49.5Hz, is less than 50.5Hz, protection meter is carried out using original sampling data area data
It calculates；
(4), some special protection modules, as injected type stator ground protection module, triple-frequency harmonics protective module, rotor connect
Ground protective module, frequency anomaly protective module, over-excitation protection module directly adopt original sampling data area data and are protected
It calculates；
(5) startup over-current protection module directlys adopt original sampling data area data and carries out protection calculating, and system frequency
When less than 10Hz, protective module is not latched；
(6), protection recording uses the data in original sampling data area.
Step 7, it is calculated according to protection and the result output protection of logic judgment controls signal, so that corresponding protection executes
Mechanism action, to complete to protect.
Embodiment 2
The present embodiment is a kind of microcomputer protecting device for adapting to electrical equipment frequency property, comprising:
Equipment operating data obtains module, for obtaining equipment operating data based on the sampling of preset fixed frequency；
Equipment actual frequency computing module, for calculating the currently practical frequency of equipment according to sampled data；
Sampled data correction module, for being corrected, obtaining to sampled data according to fixed frequency and equipment actual frequency
To power frequency correction data；
And protection calculates and control output module, is used for according to preset protection calculating and sampled data selection rule,
Multinomial protection calculating is carried out based on power frequency correction data or original sampling data, and is protected according to what protection calculated as a result, controlling
Action actuating mechanism executes protection act.
Microcomputer protecting device further includes data memory module, and data memory module includes original sampling data area and correction number
According to area；The equipment operating data is deposited in original sampling data area, and the power frequency correction data deposits in correction data area.
On this basis, modularized design, the data point in original sampling data area and correction data area can be used in all types of protection calculating
Each protection computing module is not passed to by data source pointer, then it is each protection computing module further according to frequency size with
And preset sampled data selection rule calculate the switching of data source, then carries out protection calculating and logic judgment.
To sum up by calculating measurement frequency first, algorithm correction, benefit are carried out to original sample point further according to the size of frequency
It can voluntarily select to protect according to the specific demand of electrical quantity frequency and protective module itself with each protection computing module of the invention
Data source is calculated, frequency shift (FS) bring is can effectively solve and calculates error, is computed correctly the positive-sequence component and negative phase-sequence point of electrical quantity
Amount, using the variation of frequency protection of the invention and over-excitation protection calculated value energy response frequency, protective device electrical quantity recording
It can correctly reflect the variation of frequency.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The embodiment of the present invention is described in conjunction with attached drawing above, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (9)
1. a kind of Microcomputer Protection method for adapting to electrical equipment frequency property, characterized in that include:
It obtains equipment and runs sampled data；
The currently practical frequency of equipment is calculated according to sampled data；
According to equipment rated frequency and equipment actual frequency, sampled data is corrected, obtains power frequency correction data；
According to preset protection calculating and sampled data selection rule, carried out based on power frequency correction data or original sampling data more
Item protection calculates, and according to protection calculating as a result, controlling protection act executing agency executes protection act.
2. according to the method described in claim 1, it is characterized in that, the equipment operating data be equipment during startup be
System voltage and current data.
3. according to the method described in claim 1, it is characterized in that, further include distinguishing original sampling data and power frequency correction data
It stores to different storage zone.
4. according to the method described in claim 1, it is characterized in that, sampled data be corrected include:
It determines correction reference data point, is denoted as X0, with X0Sampled data window for correction reference data point is [X0,
X1......XN-1]；
Assuming that the currently practical frequency of equipment is F1, required power frequency correction data is M, then power frequency correction data Xj' are as follows:
In formula,Counting period Δ f=j*F between target correction sampled point and actual samples point0-i*F1, F0
For system power voltagerating frequency, F1For system power voltage actual frequency, INT () indicates to be rounded the parameter in bracket；p
(F1) it is predetermined correction data frequency compensation coefficient.
5. according to the method described in claim 4, it is characterized in that, the correction data frequency compensation coefficient are as follows:
p(F1)=m1*F1+m2
In formula, the proportionality coefficient m of frequency compensation coefficient1With intercept m2Determination method include:
Apply current or voltage, frequency 50Hz, amplitude A0 in AC sampling channel with relay-protection tester；
Maintain application current or voltage amplitude A0 constant, change frequency is F11, protective device display amplitude is A1, then has frequency F11
Under correction data frequency compensation coefficient are as follows:
Maintain application current or voltage amplitude A0 constant, changing frequency again is F12, protective device display amplitude is A2, then has F12
Under little Zheng data frequency penalty coefficient are as follows:
Based on known A0, A1 and A2, following equation group is solved:
Obtain parameter m1With m2Value.
6. according to the method described in claim 1, it is characterized in that, the preset protection calculates and sampled data selection rule packet
It includes:
When the currently practical frequency of equipment is less than first frequency setting value, it is latched other protection meters in addition to startup over-current protection
Calculate function；
When the currently practical frequency of equipment is greater than first frequency setting value and sets less than second frequency setting value, or greater than third frequency
When definite value, protection calculating is carried out using power frequency correction data；
When the currently practical frequency of equipment, which is greater than or equal to second frequency setting value, is less than third frequency setting value, adopted using original
Sample data carry out protection calculating；
The first frequency setting value, second frequency setting value, third frequency setting value are sequentially increased；
Including injected type stator ground protection module, triple-frequency harmonics protective module, rotor earth fault protection module, frequency anomaly protection
The special protection of module and over-excitation protection module calculates and startup over-current protection calculates, only with original sampling data into
Row；
Recording is protected to use original sampling data.
7. according to the method described in claim 6, it is characterized in that, the first/bis-/tri- frequency setting value be 10Hz/49.5Hz/
50.5Hz。
8. a kind of microcomputer protecting device for adapting to electrical equipment frequency property, characterized in that include:
Equipment operating data obtains module, for obtaining equipment operation sampled data；
Equipment actual frequency computing module, for calculating the currently practical frequency of equipment according to sampled data；
Sampled data correction module, for being corrected to sampled data, obtaining work according to fixed frequency and equipment actual frequency
Frequency correction data；
And protection calculates and control output module, for being based on according to preset protection calculating and sampled data selection rule
Power frequency correction data or original sampling data carry out multinomial protection calculating, and according to protection calculating as a result, control protection act
Executing agency executes protection act.
9. the microcomputer protecting device according to claim 8 for adapting to electrical equipment frequency property, characterized in that Microcomputer Protection
Device further includes data memory module, and data memory module includes original sampling data area and correction data area；The equipment fortune
Row data are deposited in original sampling data area, and the power frequency correction data deposits in correction data area.
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| CN111355218A (en) * | 2020-04-07 | 2020-06-30 | 南京南瑞继保电气有限公司 | Protection method and device for low-frequency starting process of generator |
| CN113672863A (en) * | 2021-07-08 | 2021-11-19 | 南京国电南自电网自动化有限公司 | Simplified phasor calculation method and system for generator startup protection |
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| CN113672863A (en) * | 2021-07-08 | 2021-11-19 | 南京国电南自电网自动化有限公司 | Simplified phasor calculation method and system for generator startup protection |
| CN113672863B (en) * | 2021-07-08 | 2024-05-28 | 南京国电南自电网自动化有限公司 | Simplified phasor calculation method and system for generator start-up protection |
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| CN110535091B (en) | 2021-09-03 |
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