CN110208593A - A method of the detection electric current for electric fireproof current-limiting type protector - Google Patents
A method of the detection electric current for electric fireproof current-limiting type protector Download PDFInfo
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- CN110208593A CN110208593A CN201910496895.5A CN201910496895A CN110208593A CN 110208593 A CN110208593 A CN 110208593A CN 201910496895 A CN201910496895 A CN 201910496895A CN 110208593 A CN110208593 A CN 110208593A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/06—Measuring real component; Measuring reactive component
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Abstract
The present invention relates to a kind of methods of detection electric current for electric fireproof current-limiting type protector, the corresponding transient current signal of the instantaneous value inductive output of alternating current including will test, by transient current signal after the Fourier expansion under rest frame, pass through orthogonal signal generator, obtain quadrature current signal, quadrature current signal is passed through into synchronous rotating angle, after low-pass filter and synchronously rotating reference frame inverse transformation, obtained fundametal compoment signal, a large amount of higher harmonic components signal is filtered out, the accuracy of tested current signal can be improved, avoid the unstable of control system caused by subsequent processing, cause the malfunction of electric fireproof current-limiting type protector.
Description
Technical field
The present invention relates to electric and electronic class emergency protective circuit fields, more particularly to a kind of electric fireproof current-limiting type that is used for protect
The method for protecting the detection electric current of device.
Background technique
Currently in many commercial measurements such as automated detection system, computer data acquisition system, industrial control system,
Often the various types of signal of measure field is collected in DSP unit.During acquisition, various interference signals can be with
Measured current signal enters DSP control system, these signal superpositions can make measurement on useful tested current signal
Accuracy avoids subsequent processing from causing the unstable of control system, and the mistake for causing electric fireproof current-limiting type protector is dynamic
Make.
Summary of the invention
It is a kind of for electric fireproof current-limiting the technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide
The method of the detection electric current of formula protector.
The technical scheme to solve the above technical problems is that a kind of inspection for electric fireproof current-limiting type protector
The method for surveying electric current, comprising:
S1, the wink by the alternating current of the current sensor real-time detection major loop in electric fireproof current-limiting type protector
Duration I, and the corresponding transient current signal I of inductive outputsignal；
By the transient current signal IsignalAfter carrying out Fourier expansion, the I is obtainedsignalFourier expansion formula,
Based on the IsignalFourier expansion formula quadrature current signal I is obtained by orthogonal signal generatorsignal_αWith
Isignal_β, wherein the Isignal_αAnd Isignal_βThe respectively described transient current signal IsignalThe α in vertical coordinate system (α, β)
The current signal of axis and β axis；
S2, by the Isignal_αWith the Isignal_βAfter synchronized rotating coordinate transformation, instantaneous active electric current point is isolated
Measure signal Isignal_pWith instantaneous reactive current component signal Isignal_q；
S3, by the Isignal_pWith the Isignal_qLow-pass filtered device filtering, obtains fundamental active current component signalWith fundamental reactive current component signal
S4, will be describedWith it is describedAfter synchronized rotational coordinates inverse transformation, α axis fundamental active is obtained
Current signalWith α axis fundamental reactive current signalAnd then obtain fundametal compoment signal If, and by the IfIt is sent to place
Manage judgement and processing that device carries out fault signature.
The beneficial effects of the present invention are: the corresponding transient current of instantaneous value I inductive output for the alternating current that will test
Signal Isignal, by transient current signal IsignalAfter the Fourier expansion under rest frame, by orthogonal signal generator,
Obtain quadrature current signal Isignal_αAnd Isignal_β, quadrature current signal is passed through into synchronous rotating angle, low-pass filter
And after synchronously rotating reference frame inverse transformation, acquired fundametal compoment signal If, a large amount of higher harmonic components signal has been filtered out, it can
The accuracy for improving tested current signal, avoids the unstable of control system caused by subsequent processing, causes electric fireproof current-limiting
The malfunction of formula protector.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the specific steps of the S1 include:
By the transient current signal IsignalAfter the Fourier expansion under rest frame, obtain:
Wherein, ω be input supply voltage angular frequency,Initial phase angle, I for input supply voltage2n-1It is the 2n-1 times
The amplitude of Harmonics of Input component signal andFor the initial phase angle of the 2n-1 times Harmonics of Input component signal, n is
Integer greater than 1；
By the IsignalFourier expansion formula by orthogonal signal generator,
Obtain quadrature current signal Isignal_αAnd Isignal_β。
Further, the specific steps of the S2 include:
By the Isignal_αWith the Isignal_βSynchronized rotating coordinate transformation,
Isolate the Isignal_pWith the Isignal_q。
Further, the specific steps of the S3 include:
The Isignal_pWith the Isignal_qAfter the filtering of low-pass first order filter, obtain:
Wherein, describedIt is described for the fundamental active current component signal of the α axisFor the β axis
Fundamental reactive current component signal.
Further, the specific steps of the S4 include:
It is describedWith it is describedα axis fundamental active current signal is obtained through the rotational coordinates inverse transformationWith α axis fundamental reactive current signal
The fundametal compoment signal IfIt is describedWith it is describedThe sum of,
The fundametal compoment signal I that will be obtainedfIt is sent to judgement and processing that processor carries out fault signature.
Beneficial effect using above-mentioned further scheme is: by using the SIN function expansion of Fourier space, obtaining
Instantaneous active electric current is obtained by the way that quadrature current signal is synchronized rotating coordinate transformation to convergent quadrature current signal
Component signal and instantaneous reactive current component signal, by obtained instantaneous active current component signal and instantaneous reactive current component
The low-pass filtered device filtering of signal, obtains fundamental active current component signal and fundamental reactive current component signal, fundamental wave is had
Function current component signal and the synchronized rotational coordinates anti-change of fundamental reactive current component signal, obtain α axis fundamental active current
Signal and α axis fundamental reactive current signal are obtained by the sum of α axis fundamental active current signal and α axis fundamental reactive current signal
To fundametal compoment signal, obtained fundametal component signal filters out a large amount of higher harmonic components letter from transient current signal
Number, the accuracy of tested current signal is improved, the unstable of control system caused by subsequent processing is avoided, causes electric fireproof
The malfunction of current-limiting type protector.
The advantages of additional aspect of the invention, will be set forth in part in the description, and will partially become from the following description
It obtains obviously, or practice is recognized through the invention.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to the embodiment of the present invention or the prior art
Attached drawing needed in description is briefly described, it should be apparent that, drawings described below is only of the invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is a kind of process of the method for the detection electric current for electric fireproof current-limiting type protector of the embodiment of the present invention
Schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is a part of the embodiments of the present invention, rather than whole embodiments.Based on this hair
Embodiment in bright, those of ordinary skill in the art's every other reality obtained without making creative work
Example is applied, all should belong to the scope of protection of the invention.
A kind of flow diagram of the method for the detection electric current for electric fireproof current-limiting type protector as shown in Figure 1, packet
It includes:
S1: pass through the wink of the alternating current of the current sensor real-time detection major loop in electric fireproof current-limiting type protector
Duration I, and the corresponding transient current signal I of inductive outputsignal；
By transient current signal IsignalAfter carrying out Fourier expansion, I is obtainedsignalFourier expansion formula, be based on Isignal
Fourier expansion formula quadrature current signal I is obtained by orthogonal signal generatorsignal_αAnd Isignal_β, wherein Isignal_α
And Isignal_βRespectively transient current signal IsignalThe current signal of α axis and β axis in vertical coordinate system (α, β).
S2, by Isignal_αAnd Isignal_βAfter synchronized rotating coordinate transformation, instantaneous active current component signal is isolated
Isignal_pWith instantaneous reactive current component signal Isignal_q。
S3, by Isignal_pAnd Isignal_qLow-pass filtered device filtering, obtains fundamental active current component signal
With fundamental reactive current component signal
S4, generalWithAfter synchronized rotational coordinates inverse transformation, α axis fundamental active current signal is obtainedWith α axis fundamental reactive current signalAnd then obtain fundametal compoment signal If, and by IfIt is sent to processor and carries out failure
The judgement and processing of feature.
It should be understood that the concrete model of electric fireproof current-limiting type protector is not limited, not to current sense in the present embodiment yet
The concrete model of device is limited.
In addition, the effect of the orthogonal signal generator in the present embodiment is to be obtained by orthogonal signal generator based on wink
When current signal quadrature current signal, can be the form of hardware or software, when being example, in hardware, do not limit specific
Hardware configuration.Low-pass filter in the present embodiment completes the filtering to current signal, does not limit specific hardware configuration.
Through this embodiment, the corresponding transient current signal of instantaneous value I inductive output for the alternating current that will test
Isignal, by transient current signal IsignalAfter the Fourier expansion under rest frame, by orthogonal signal generator, obtain
Quadrature current signal Isignal_αAnd Isignal_β, quadrature current signal is passed through into synchronous rotating angle, low-pass filter and same
After walking rotational coordinates inverse transformation, acquired fundametal compoment signal If, a large amount of higher harmonic components signal has been filtered out, can be improved
The accuracy of tested current signal, avoids the unstable of control system caused by subsequent processing, causes electric fireproof current-limiting type and protects
Protect the malfunction of device.
Further, the specific steps of S1 include:
By transient current signal IsignalAfter the Fourier expansion under rest frame, obtain:
Wherein, ω be input supply voltage angular frequency,Initial phase angle, I for input supply voltage2n-1It is the 2n-1 times
The amplitude of Harmonics of Input component signal andFor the initial phase angle of the 2n-1 times Harmonics of Input component signal, n is
Integer greater than 1；
By IsignalFourier expansion formula by orthogonal signal generator,
Obtain quadrature current signal Isignal_αAnd Isignal_β。
Further, the specific steps of S2 include:
By Isignal_αAnd Isignal_βSynchronized rotating coordinate transformation,
Isolate Isignal_pAnd Isignal_q。
Further, the specific steps of S3 include:
Isignal_pAnd Isignal_qAfter the filtering of low-pass first order filter, obtain:
Wherein,For the fundamental active current component signal of α axis,For the fundamental reactive current point of β axis
Measure signal.
Further, the specific steps of S4 include:
Withα axis fundamental active current signal is obtained through rotational coordinates inverse transformationWith α axis fundamental wave
Reactive current signal
Fundametal compoment signal IfIt isWithThe sum of,
The fundametal compoment signal I that will be obtainedfIt is sent to judgement and processing that processor carries out fault signature.
Beneficial effect using above-mentioned further scheme is the SIN function expansion by using Fourier space, is obtained
Convergent quadrature current signal obtains instantaneous active electric current point by the way that quadrature current signal is synchronized rotating coordinate transformation
Signal and instantaneous reactive current component signal are measured, obtained instantaneous active current component signal and instantaneous reactive current component are believed
Number low-pass filtered device filtering, obtains fundamental active current component signal and fundamental reactive current component signal, by fundamental active
Current component signal and the synchronized rotational coordinates anti-change of fundamental reactive current component signal obtain α axis fundamental active current letter
Number and α axis fundamental reactive current signal obtained by the sum of α axis fundamental active current signal and α axis fundamental reactive current signal
Fundametal compoment signal, obtained fundametal component signal filter out a large amount of higher harmonic components signal from transient current signal,
The accuracy for improving tested current signal avoids the unstable of control system caused by subsequent processing, causes electric fireproof limit
The malfunction of streaming protector.
More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be wanted with right
Subject to the protection scope asked.
Claims (5)
1. a kind of method of the detection electric current for electric fireproof current-limiting type protector characterized by comprising
S1, the instantaneous value by the alternating current of the current sensor real-time detection major loop in electric fireproof current-limiting type protector
I, and the corresponding transient current signal I of inductive outputsignal；
By the transient current signal IsignalAfter carrying out Fourier expansion, quadrature current signal is obtained through orthogonal signal generator
Isignal_αAnd Isignal_β, wherein the Isignal_αAnd Isignal_βThe respectively described transient current signal IsignalIn vertical coordinate
It is the current signal of α axis and β axis in (α, β)；
S2, by the Isignal_αWith the Isignal_βAfter synchronized rotating coordinate transformation, instantaneous active current component letter is isolated
Number Isignal_pWith instantaneous reactive current component signal Isignal_q；
S3, by the Isignal_pWith the Isignal_qLow-pass filtered device filtering, obtains fundamental active current component signalWith fundamental reactive current component signal
S4, will be describedWith it is describedAfter synchronized rotational coordinates inverse transformation, α axis fundamental active current is obtained
SignalWith α axis fundamental reactive current signalAnd then obtain fundametal compoment signal If, and by the IfIt is sent to processor
Carry out the judgement and processing of fault signature.
2. the method according to claim 1, wherein the specific steps of the S1 include:
By the transient current signal IsignalAfter the Fourier expansion under rest frame, obtain:
Wherein, ω be input supply voltage angular frequency,Initial phase angle, I for input supply voltage2n-1It is inputted for the 2n-1 times
The amplitude of current harmonics component signal andFor the initial phase angle of the 2n-1 times Harmonics of Input component signal, n be greater than
1 integer；
By the IsignalFourier expansion formula through orthogonal signal generator, obtain quadrature current signal Isignal_αAnd Isignal_β
Are as follows:
3. according to the method described in claim 2, it is characterized in that, the specific steps of the S2 include:
By the Isignal_αWith the Isignal_βSynchronized rotating coordinate transformation,
Isolate the Isignal_pWith the Isignal_q。
4. according to the method described in claim 3, it is characterized in that, the specific steps of the S3 include:
The Isignal_pWith the Isignal_qAfter the filtering of low-pass first order filter, obtain:
Wherein, describedIt is described for the fundamental active current component signal of the α axisFor the base of the β axis
Wave reactive current component signal.
5. according to the method described in claim 4, it is characterized in that, the specific steps of the S4 include:
It is describedWith it is describedα axis fundamental active current signal is obtained through the rotational coordinates inverse transformationWith
α axis fundamental reactive current signal
The fundametal compoment signal IfIt is describedWith it is describedThe sum of,
The fundametal compoment signal I that will be obtainedfIt is sent to judgement and processing that processor carries out fault signature.
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Cited By (1)
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