CN108037357A - A kind of frequency tracking method of Automation of Electric Systems device - Google Patents
A kind of frequency tracking method of Automation of Electric Systems device Download PDFInfo
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- CN108037357A CN108037357A CN201711230794.0A CN201711230794A CN108037357A CN 108037357 A CN108037357 A CN 108037357A CN 201711230794 A CN201711230794 A CN 201711230794A CN 108037357 A CN108037357 A CN 108037357A
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- frequency
- analog quantity
- virtual source
- tracking
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention shows a kind of frequency tracking method of Automation of Electric Systems device, include the following steps, step 1, all input analog amount passages in Automation of Electric Systems device are abstracted into virtual source, the quantity, type and order for the analog quantity channel that each virtual source includes are obtained by user's static configuration；Step 2, the virtual source that each protection and observing and controlling element use in Automation of Electric Systems device is determined in the form of definite value by user's dynamic configuration；Step 3, when each frequency-tracking element carries out frequency-tracking, the analog quantity channel of reference first is found according to the order of user configuration from the X of default Virtual source, examining and determine algorithm according to analog quantity channel validity judges whether analog quantity channel is effective；The present invention realizes the automatic switchover of reference source, effectively increases the reliability of relay equipment frequency measurement and following function.Can ensure the sample frequency of Automation of Electric Systems device when system frequency changes can follow in real time.
Description
Technical field
The present invention relates to power system automation technology field, be specially a kind of frequency of Automation of Electric Systems device with
Track method.
Background technology
Application of the frequency-tracking in Automation of Electric Systems device is more universal so that sample frequency integer times power grid
Frequency, when system frequency changes, the sample frequency of device can follow in real time, so that analog quantity computational accuracy has been effectively ensured,
So that the accuracy higher of Automation of Electric Systems unit protection action and observing and controlling.
Existing Automation of Electric Systems device is when measuring mains frequency and tracking, typically using hardware
Frequency measurement or the method for fixed channel measurement, user can not adjust, and when selecting routing to fail, grid frequency measurement and tracking
Also fail therewith.
The content of the invention
For problems of the prior art, the present invention provides a kind of frequency-tracking side of Automation of Electric Systems device
Method, frequency-tracking reference source can be adjusted, while when selecting cover half analog quantity channel failure, grid frequency measurement and tracking can
Automatically switch therewith, it is reliable and stable, it is safe and efficient.
The present invention is to be achieved through the following technical solutions：
A kind of frequency tracking method of Automation of Electric Systems device, includes the following steps,
Step 1, all input analog amount passages in Automation of Electric Systems device are abstracted into virtual source, it is quiet by user
State configures to obtain the quantity, type and order of the analog quantity channel that each virtual source includes；
Step 2, the virtual source used with observing and controlling element is protected with the shape of definite value by each in Automation of Electric Systems device
Formula is determined by user's dynamic configuration；Wherein, each protection and observing and controlling element, i.e., the initial default of each frequency-tracking element are virtual
Source X is determined by user configuration；
Step 3, when each frequency-tracking element carries out frequency-tracking, first according to user configuration from the X of default Virtual source
Order finds the analog quantity channel of reference, and examining and determine algorithm according to analog quantity channel validity judges whether analog quantity channel is effective；
If analog quantity channel effectively if frequency test and tracking carried out with this analog quantity channel；
Switch to next analog quantity channel in order if analog quantity channel is invalid, the simulation in the X of default Virtual source
When measuring passage whole failure, automatically switch to next virtual source and re-start frequency-tracking, until frequency-tracking success.
Preferably, the type of analog quantity channel includes three-phase simulation amount and individual event analog quantity, a void in a virtual source
4 groups of analog quantity channels are at most configured in plan source.
Further, three-phase simulation amount includes three-phase alternating voltage and three-phase alternating current, and single-phase analog quantity includes single-phase
Alternating voltage and single-phase alternating current.
Preferably, in step 3, in frequency-tracking element, frequency measurement measurement frequency Fs and tracking frequency Ft
Two are measured to indicate；The analog quantity frequency that measurement frequency Fs is used for real-time representation input carries out frequency protection calculating；Tracking frequency
Ft is used for the sampling interval for adjusting Automation of Electric Systems unit simulation amount.
Further, when the measurement frequency Fs analog quantity channels being changed into 0Hz and default Virtual source X all fail, from
It is dynamic to be switched to next virtual source progress frequency-tracking, until finding effective virtual source.
Further, when corresponding analog quantity channel carries out frequency-tracking as frequency reference source in choosing, detect
When the amplitude of corresponding analog quantity channel is more than 0.06pu and maintains at least five system cycle, Automation of Electric Systems device is opened
Begin to calculate and refresh output frequency in real time, otherwise handled by the default value of Fs=0Hz and Ft=50Hz；
When the amplitude for detecting corresponding analog quantity channel is less than or equal to 0.06pu, then last output frequency 40 is maintained
After cycle, handled according to the default value of Fs=0Hz and Ft=50Hz, while start the switching of virtual source internal mode analog quantity passage.
Preferably, in step 1, the priority configured inside virtual source according to analog quantity channel divides frequency measurement order.
Compared with prior art, the present invention has technique effect beneficial below：
A kind of frequency tracking method of Automation of Electric Systems device of the present invention, by the way that analog quantity is abstracted, and by
Virtual source is formed after user configuration, so as to design to obtain virtual analog amount source, so as in frequency-tracking element into line frequency
According to the configuration to virtual source and validation checking during tracking, the automatic switchover of reference source is realized, it is reliable to carry out frequency stabilization
Tracking；For frequency-tracking element, the setting of virtual source is only used as frequency-tracking initial default reference source, can be with after device operation
Track actual condition carries out the switching of reference source, effectively increases the reliability of relay equipment frequency measurement and following function.
Further, can not only be real-time by indicating frequency measurement with two amounts in frequency-tracking element
Reflect that the analog quantity frequency of input electric power system automation device carries out frequency dependence protection and calculates, and can ensure system frequency
The sample frequency of Automation of Electric Systems device can follow in real time when rate changes.
Brief description of the drawings
Fig. 1 is virtual source definition and application schematic diagram in the present invention.
Fig. 2 is virtual source frequency-tracking channel selecting flow chart in the present invention.
Fig. 3 is virtual source frequency-tracking and source switching flow figure in the present invention.
Embodiment
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
Each group of input analog amount passage is abstracted into virtual source by the present invention, and each virtual source is led to comprising which analog quantity
Road can be by user's static configuration, and the virtual source that each protection is used with observing and controlling element is in the form of definite value by user's dynamic configuration.
Wherein, each protection and observing and controlling element, i.e., the initial default virtual source X of each frequency-tracking element can be by user configuration.
The virtual source X of acquiescence is referred to as default sources X below；The analog quantity channel of reference is referred to as reference channel, that is, joins
Examine source.
As shown in Figure 1, virtual source is that multiple analog quantity channels are abstracted, in order to be protected and controlled calculating.One
It at most can configure 4 groups of analog quantity channels in a virtual source, be respectively 2 groups of three-phase simulation amounts (three-phase alternating voltage or three-phase alternating currents
Electric current) and 2 groups of single-phase analog quantitys (single-phase AC voltage or single-phase alternating current), specifically can be by user configuration.Virtual source and guarantor
Association between shield or observing and controlling element can also be configured by user in the form of definite value, to set a certain protection element or observing and controlling element
Using the value of which virtual source.
In frequency-tracking element, frequency measurement is indicated with two amounts：Measurement frequency Fs and tracking frequency Ft.Its
In, measurement frequency Fs protects to the analog quantity frequency of reflection input electric power system automation device in real time for frequency dependence
Calculate, and tracking frequency Ft is then to adjust the sampling interval of Automation of Electric Systems unit simulation amount, to ensure system frequency
The sample frequency of Automation of Electric Systems device can follow in real time during change.For frequency-tracking element, the setting of virtual source
Frequency-tracking initial default reference source is only used as, the switching that actual condition carries out reference source can be tracked after device operation.Tie below
Closing the drawings and specific embodiments, the present invention is described in detail.
The virtual source of the acquiescence input of frequency-tracking element is adjusted in the form of definite value for user, is set to virtual source X.
Inside the virtual source that one includes analog quantity channel, frequency measurement priority, virtual source X have been divided according to passage
Illustration is shown in Table 1.
The analog quantity channel and priority list of 1 virtual source X of table.
| Sequence number | Passage | Priority |
| 1 | Three-phase alternating voltage | 1 |
| 2 | Single-phase AC voltage | 2 |
| 3 | Three-phase alternating current | 3 |
| 4 | Single-phase alternating current | 4 |
As shown in Fig. 2, when frequency-tracking element carries out frequency-tracking, first match somebody with somebody from the virtual source X of acquiescence according to user
The order put finds the analog quantity channel of reference, examines and determine whether algorithm judges the analog quantity channel according to analog quantity channel validity
Effectively, as the analog quantity channel effectively if frequency test and tracking carried out with the analog quantity channel, as the analog quantity channel is invalid
Then switch to next analog quantity channel.
Assuming that virtual source is configured with three-phase alternating voltage, single-phase AC voltage, three-phase alternating current and single phase ac by table 1
Four analog quantity channels of electric current.Frequency-tracking element first selects three-phase alternating current pressure passageway as source is referred to, if three-phase alternating current
Pressure passageway fails, then selects single-phase alternating current pressure passageway to be used as and refer to source, and so on.All passages configured such as this virtual source
Failure, then the frequency F of frequency-tracking element uses default value, and the default value of frequency F is expressed as：Fs=0Hz, Ft=50Hz.
Analog quantity channel validity calibrating algorithm is, when corresponding analog quantity channel is as frequency reference source in choosing, inspection
When surveying the amplitude of corresponding analog quantity channel more than 0.06pu and maintaining at least five system cycle, then it is determined as that the passage is effective,
Automation of Electric Systems device starts to calculate and refreshes Fs, Ft output frequency in real time, and otherwise Fs, Ft are by above default value
Reason.Conversely, when the amplitude of frequency measurement passage is deteriorated to less than equal to 0.06pu, then it is determined as the channel failure, in Fs, Ft maintenance
After 40 cycles of output frequency, handled according to above default value, while start the switching of virtual source internal mode analog quantity passage.
The virtual source handoff procedure of frequency-tracking is as shown in Figure 3.When the analog quantity channel in the virtual source X of acquiescence all loses
During effect, virtual source X fails as the frequency-tracking with reference to source, then is switched under virtual source thereafter and carries out frequency-tracking, if cutting
Still frequency-tracking fails virtual source after changing, then continues switching downwards, until the effective virtual source of analog quantity channel is found, from
And frequency-tracking success.
Claims (7)
- A kind of 1. frequency tracking method of Automation of Electric Systems device, it is characterised in that include the following steps,Step 1, all input analog amount passages in Automation of Electric Systems device are abstracted into virtual source, are matched somebody with somebody by user's static state Put to obtain the quantity, type and order for the analog quantity channel that each virtual source includes；Step 2, will each protection and observing and controlling element use in Automation of Electric Systems device virtual source in the form of definite value by User's dynamic configuration determines；Wherein, each protection and observing and controlling element, i.e., the initial default virtual source X of each frequency-tracking element Determined by user configuration；Step 3, when each frequency-tracking element carries out frequency-tracking, first according to the order of user configuration from the X of default Virtual source The analog quantity channel of reference is found, examining and determine algorithm according to analog quantity channel validity judges whether analog quantity channel is effective；If analog quantity channel effectively if frequency test and tracking carried out with this analog quantity channel；Next analog quantity channel is switched in order if analog quantity channel is invalid, when the analog quantity in the X of default Virtual source is led to When road all fails, automatically switch to next virtual source and re-start frequency-tracking, until frequency-tracking success.
- 2. the frequency tracking method of a kind of Automation of Electric Systems device according to claim 1, it is characterised in that one The type of analog quantity channel includes three-phase simulation amount and individual event analog quantity in virtual source, and 4 groups of moulds are at most configured in a virtual source Analog quantity passage.
- A kind of 3. frequency tracking method of Automation of Electric Systems device according to claim 2, it is characterised in that three-phase Analog quantity includes three-phase alternating voltage and three-phase alternating current, and single-phase analog quantity includes single-phase AC voltage and single-phase alternating current Stream.
- A kind of 4. frequency tracking method of Automation of Electric Systems device according to claim 1, it is characterised in that step In 3, in frequency-tracking element, frequency measurement is indicated with two amounts of measurement frequency Fs and tracking frequency Ft；Measurement frequency The analog quantity frequency that rate Fs is used for real-time representation input carries out frequency protection calculating；Tracking frequency Ft is used to adjust electric system certainly It is dynamic to disguise the sampling interval for putting analog quantity.
- 5. the frequency tracking method of a kind of Automation of Electric Systems device according to claim 4, it is characterised in that work as survey When amount frequency Fs is changed into analog quantity channel in 0Hz and default Virtual source X and all fails, automatically switch to next virtual source into Line frequency tracks, until finding effective virtual source.
- 6. the frequency tracking method of a kind of Automation of Electric Systems device according to claim 4, it is characterised in that elected In corresponding analog quantity channel as frequency reference source carry out frequency-tracking when, detect that the amplitude of corresponding analog quantity channel is more than 0.06pu and when maintaining at least five system cycle, Automation of Electric Systems device starts to calculate and in real time refresh output frequency, Otherwise handled by the default value of Fs=0Hz and Ft=50Hz；When the amplitude for detecting corresponding analog quantity channel is less than or equal to 0.06pu, then 40 cycles of last output frequency are maintained Afterwards, handled according to the default value of Fs=0Hz and Ft=50Hz, while start the switching of virtual source internal mode analog quantity passage.
- A kind of 7. frequency tracking method of Automation of Electric Systems device according to claim 1, it is characterised in that step In 1, the priority configured inside virtual source according to analog quantity channel divides frequency measurement order.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109725197A (en) * | 2018-12-25 | 2019-05-07 | 西电通用电气自动化有限公司 | A kind of multiplied unit relay protection system frequency tracking method and system |
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| CN102135567A (en) * | 2011-02-25 | 2011-07-27 | 深圳市业通达实业有限公司 | Real-time frequency tracking and harmonic measuring method for AC sampling of power system |
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