CN102116798A - Power grid frequency measurement method and device - Google Patents
Power grid frequency measurement method and device Download PDFInfo
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- CN102116798A CN102116798A CN2011100538631A CN201110053863A CN102116798A CN 102116798 A CN102116798 A CN 102116798A CN 2011100538631 A CN2011100538631 A CN 2011100538631A CN 201110053863 A CN201110053863 A CN 201110053863A CN 102116798 A CN102116798 A CN 102116798A
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Abstract
The invention is applicable to the power field and provides a power grid frequency measurement method and a device. The method comprises the following steps: sampling inputted signals at equal intervals and obtaining sampled signals with equal sampling intervals; carrying out filtering treatment on the sampled signals; determining a zero crossing point of a sampled waveform according to the sampling value after the filtering treatment and storing the sampling values of front and rear sampling points of the zero crossing point; determining the number of sampling points between the adjacent zero crossing points and measuring the frequency value according to the sampling intervals, the sampling values and the sampling points. As the high-frequency filtering treatment is carried out before the base wave frequency measurement, the embodiment of the invention can effectively eliminate the interference of harmonic waves in the practical power network operation, thereby improving the detection accuracy of the zero crossing point and further improving the reliability and the accuracy of the base wave frequency measurement.
Description
Technical field
The invention belongs to power domain, relate in particular to a kind of grid frequency measurement method and device.
Background technology
In power quality analysis, often need to measure the frequency and the deviation thereof of electric system.
In the existing fundamental frequency measuring method, often adopt integer-period sampled some counting method.This method is at first determined the cycle of first-harmonic, after determining the primitive period, determines the frequency of first-harmonic again according to the time interval between the sampled point in the primitive period.This method the sampling period more after a little while, measured frequency accuracy is very poor, and when longer, can not satisfy the requirement of real-time in the sampling period again.In addition, this method does not have filtering high-frequency harmonic signal when survey frequency, and when harmonic interference was serious, can there be distortion in zero crossing, thereby influences determining of whole primitive period, finally causes measured frequency inaccurate.
Summary of the invention
The embodiment of the invention provides a kind of grid frequency measurement method, is intended to solve the existing frequency measurement method problem that precision is relatively poor and Measuring Time is long when measuring mains frequency.
The embodiment of the invention is achieved in that a kind of grid frequency measurement method, and described method comprises the steps:
The signal of equal interval sampling input obtains the sampled signal that sampling interval equates;
Described sampled signal is carried out Filtering Processing;
Determine the zero crossing of sample waveform according to the sampled value after the Filtering Processing, and store the sampled value of former and later two sampled points of described zero crossing;
Determine sampling number between adjacent two zero crossings according to described zero crossing, and according to described sampling interval, sampled value and described sampling number frequency values.
Another purpose of the embodiment of the invention is to provide a kind of grid frequency measurement device, and described device comprises:
Sample circuit is used for the signal that equal interval sampling is imported, and obtains the sampled signal that sampling interval equates;
The sampled signal filter unit is used for described sampled signal is carried out Filtering Processing;
The zero crossing judging unit is used for determining according to the sampled value after the Filtering Processing zero crossing of sample waveform, and stores the sampled value of former and later two sampled points of described zero crossing;
Frequency measurement unit is used for determining sampling number between adjacent two zero crossings according to described zero crossing, and according to described sampling interval, sampled value and described sampling number frequency values.
In the embodiment of the invention, signal to input carries out carrying out corresponding Filtering Processing again behind the periodic sampling, and determine the zero crossing of sample waveform and the sampled value of storing former and later two sampled points of this zero crossing according to the sampled value after the Filtering Processing, determine the sampling number between adjacent two zero crossings at last again, and measure the frequency values of first-harmonic according to sampling interval, sampled value and sampling number.Owing to before measuring fundamental frequency, carried out the High frequency filter processing, therefore can effectively eliminate the interference of actual electric network harmonic wave in service, improved the accuracy that zero crossing detects, and then the reliability and the accuracy of fundamental frequency are measured in raising, and, only need judge two zero crossings just can calculate fundamental frequency in the embodiment of the invention, is guaranteeing that frequency computation part is accurate
Under the prerequisite of property, shortened the whole frequency measurement time.
Description of drawings
Fig. 1 is the grid frequency measurement method flow that first embodiment of the invention provides;
Fig. 2 is the filtering high-frequency harmonic frequency oscillogram before that first embodiment of the invention provides;
Fig. 3 is the filtering high-frequency harmonic frequency oscillogram afterwards that first embodiment of the invention provides;
Fig. 4 is the XOR gate synoptic diagram that judgement zero crossing that first embodiment of the invention provides is adopted;
Fig. 5 is the measurement fundamental frequency value desired parameters synoptic diagram that first embodiment of the invention provides;
Fig. 6 is the flow process of the calculating fundamental frequency that provides of first embodiment of the invention;
Fig. 7 is the grid frequency measurement apparatus structure that second embodiment of the invention provides.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention carries out carrying out corresponding Filtering Processing again behind the periodic sampling to the signal of input, and determine the zero crossing of sample waveform and the sampled value of storing former and later two sampled points of this zero crossing according to the sampled value after the Filtering Processing, determine the sampling number between adjacent two zero crossings at last again, and measure the frequency values of first-harmonic according to sampling interval, sampled value and sampling number.
It is a kind of that the embodiment of the invention provides: grid frequency measurement method and device.
Described method comprises: the signal of equal interval sampling input obtains the sampled signal that sampling interval equates;
Described sampled signal is carried out Filtering Processing;
Determine the zero crossing of sample waveform according to the sampled value after the Filtering Processing, and store the sampled value of former and later two sampled points of described zero crossing;
Determine sampling number between adjacent two zero crossings according to described zero crossing, and according to described sampling interval, sampled value and described sampling number frequency values.
Described device comprises: sample circuit, be used for the signal that equal interval sampling is imported, and obtain the sampling interval phase
Deng sampled signal;
The sampled signal filter unit is used for described sampled signal is carried out Filtering Processing;
The zero crossing judging unit is used for determining according to the sampled value after the Filtering Processing zero crossing of sample waveform, and stores the sampled value of former and later two sampled points of described zero crossing;
Frequency measurement unit is used for determining sampling number between adjacent two zero crossings according to described zero crossing, and according to described sampling interval, sampled value and described sampling number frequency values.
In the embodiment of the invention, signal to input carries out carrying out corresponding Filtering Processing again behind the periodic sampling, and determine the zero crossing of sample waveform and the sampled value of storing former and later two sampled points of this zero crossing according to the sampled value after the Filtering Processing, determine the sampling number between adjacent two zero crossings at last again, and measure the frequency values of first-harmonic according to sampling interval, sampled value and sampling number.Owing to before measuring fundamental frequency, carried out the High frequency filter processing, therefore can effectively eliminate the interference of actual electric network harmonic wave in service, improved the accuracy that zero crossing detects, and then the reliability and the accuracy of fundamental frequency are measured in raising, and, only need judge two zero crossings just can calculate fundamental frequency in the embodiment of the invention, under the prerequisite that guarantees the frequency computation part accuracy, has shortened the whole frequency measurement time.
For technical solutions according to the invention are described, describe below by specific embodiment.
Embodiment one:
Fig. 1 shows the grid frequency measurement method flow that first embodiment of the invention provides, and wherein, the embodiment of the invention is an example to measure fundamental frequency mainly, and details are as follows:
In step S11, the signal of equal interval sampling input obtains sampled signal.
In embodiments of the present invention, the signal of importing is carried out equal interval sampling, the interval of two adjacent arbitrarily sampled points is equated, assurance signals sampling frequency is fixed.
In step S12, this sampled signal is carried out Filtering Processing.
In embodiments of the present invention, before survey frequency, the pairing signal of the frequency that needs filtering need not measure.If measure the frequency of 50Hz or 60Hz fundamental signal, then can use wave digital lowpass filter with the harmonic signal filtering outside 50Hz or the 60Hz, this is because the high-frequency harmonic signal that is present in the electrical network can make the zero crossing of fundamental signal produce serious distortion, influence the measuring accuracy of frequency the most at last, and filtering can eliminate high-frequency signal after the high-frequency harmonic to detecting the interference of zero crossing.Wherein, high-frequency harmonic can be found out that to the influence of zero crossing Fig. 2 shows the oscillogram before the filtering high-frequency harmonic frequency by Fig. 2 and Fig. 3, and Fig. 3 shows filtering high-frequency harmonic frequency oscillogram afterwards.
In step S13, determine the zero crossing of sample waveform according to the sampled value after the Filtering Processing, and store the sampled value of former and later two sampled points of this zero crossing.
In embodiments of the present invention, be on the coordinate axis of horizontal ordinate with the x axle, with in the oscillogram from the bottom up waveform and the intersection point of x axle be called the positive going zeror crossing point, and the waveform that will be from top to bottom and the intersection point of x axle are called the negative sense zero crossing.
As an alternative embodiment of the invention, determine that according to the sampled value after the Filtering Processing step of the zero crossing of sample waveform is specially:
Judge the symbol of adjacent two sampled values,, then between these two sampled values, have the zero crossing of sample waveform as if the symbol difference of these adjacent two sampled values; If the symbol of these adjacent two sampled values is identical, then between these two sampled values, there is not the zero crossing of sample waveform.Wherein, when having the zero crossing of sample waveform between adjacent two sampled values, if the symbol of first sampled value is a positive sign, and second sampled value be negative sign, and then this zero crossing is the negative sense zero crossing; If the symbol of first sampled value is a negative sign, and second sampled value be positive sign, and then this zero crossing is the positive going zeror crossing point.Wherein, the sampled value of more adjacent two sampled points can use XOR gate shown in Figure 4 to realize.The sign bit of the sampled point amplitude of the sign bit of sampled point amplitude and input in the register is as the input of XOR gate, and the if symbol position is identical, and XOR gate 41 is output as 0, if symbol position difference, and XOR gate 41 is output as 1.
In embodiments of the present invention, after the zero crossing of determining sample waveform, the sampled value of storing a previous and back sampled point of this zero crossing.
In step S14, determine sampling number between adjacent two zero crossings according to zero crossing, and determine frequency values according to the sampled value and the sampling number of this sampling interval, storage.
In embodiments of the present invention, determined after first zero crossing of sample waveform, added up this zero crossing, measured the frequency of first-harmonic at last to the sampling number that exists between the next zero crossing.
Referring to Fig. 5, this Fig. 5 shows and calculates the parameter that this fundamental frequency value may use, and adopts the formula of the calculation of parameter fundamental frequency of Fig. 5 to be:
(1) if calculating first zero crossing is the negative sense zero crossing, second the frequency values that zero crossing be positive going zeror crossing point adjacent with this first zero crossing then uses formula
Calculate, wherein, f
1Be frequency values, N is the sampling number between this negative sense zero crossing and the positive going zeror crossing point, t
sBe the sampling interval between adjacent two sampled points, described Δ t
1Be the interval between the back sampled point of first zero crossing and described first zero crossing, described Δ t
2It is the interval between the previous sampled point of second zero crossing and described second zero crossing.Δ t
1With Δ t
2Can calculate according to the sampled value of linear interpolation method with former and later two sampled points of zero crossing, the sampled value of supposing the previous sampled point of negative sense zero crossing is y
1, the sampled value of a back sampled point is y
2, then
Suppose that it is y that positive going zeror crossing is put the sampled value of previous sampled point
3, the sampled value of a back sampled point is y
4, then
Wherein, use formula
The idiographic flow that calculates fundamental frequency sees also Fig. 6.
(2) if calculating first zero crossing is the positive going zeror crossing point, second the frequency values that zero crossing be negative sense zero crossing adjacent with this first zero crossing then uses formula
Calculate, wherein, f
2Be frequency values, M is the sampling number between this positive going zeror crossing point and the negative sense zero crossing, t
sBe the interval of adjacent two sampled points, described Δ t
3Be the interval between the previous sampled point of first zero crossing and described first zero crossing, described Δ t
4It is the interval between the previous sampled point of second zero crossing and described second zero crossing.Referring to Fig. 5, the Δ t in this formula
3Be equivalent to the Δ t among Fig. 5
2, this Δ t
3Computing formula and above-mentioned (1) in calculate Δ t
2Identical, repeat no more herein.And Δ t
4Can calculate according to the sampled value of linear interpolation method with former and later two sampled points of zero crossing, the sampled value of supposing the previous sampled point of negative sense zero crossing is y
5, the sampled value of a back sampled point is y
6, then
In first embodiment of the invention, signal to input carries out carrying out corresponding Filtering Processing again behind the periodic sampling, and determine the zero crossing of sample waveform and the sampled value of storing former and later two sampled points of this zero crossing according to the sampled value after the Filtering Processing, determine the sampling number between adjacent two zero crossings at last again, and measure the frequency values of first-harmonic according to sampling interval, sampled value and sampling number.Owing to before measuring fundamental frequency, carried out the High frequency filter processing, therefore can effectively eliminate the interference of actual electric network harmonic wave in service, improved the accuracy that zero crossing detects, and then the reliability and the accuracy of fundamental frequency are measured in raising, and, only need judge two zero crossings just can calculate fundamental frequency in the embodiment of the invention, under the prerequisite that guarantees the frequency computation part accuracy, has shortened the whole frequency measurement time.
Embodiment two:
Fig. 7 shows the grid frequency measurement apparatus structure that second embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
This grid frequency measurement device can be to run on the unit that software unit, hardware cell or software and hardware in the terminal combine, and also can be used as independently, suspension member is integrated in these terminals or runs in the application system of these terminals, wherein:
In embodiments of the present invention, the signal of equal interval sampling input equates the interval of two adjacent arbitrarily sampled points, and assurance signals sampling frequency is fixed.
Sampled signal filter unit 72 is used for this sampled signal is carried out Filtering Processing.
In embodiments of the present invention, if measure the frequency of 50Hz or 60Hz fundamental signal, then can use the harmonic signal outside wave digital lowpass filter filtering 50Hz or the 60Hz, this is because the high-frequency harmonic signal that is present in the electrical network can make the zero crossing of fundamental signal produce serious distortion, influence the measuring accuracy of frequency the most at last, and filtering can eliminate high-frequency signal after the high-frequency harmonic to detecting the interference of zero crossing.
Zero crossing judging unit 73 is used for determining according to the sampled value after the Filtering Processing zero crossing of sample waveform, and stores the sampled value of former and later two sampled points of this zero crossing.
As an alternative embodiment of the invention, this zero crossing judging unit 73 comprises: sampled value symbol decision module 731, zero crossing exist determination module 732 and zero crossing not to have determination module 733
Sampled value symbol decision module 731 is used to judge the symbol of adjacent two sampled values.
There is determination module 732 in zero crossing, is used for determining to exist between these two sampled values the zero crossing of sample waveform at the symbol of these adjacent two sampled values not simultaneously.
There is not determination module 733 in zero crossing, is used for symbol in these adjacent two sampled values when identical, determines not exist between these two sampled values the zero crossing of sample waveform.
In embodiments of the present invention, if there is the zero crossing of sample waveform between adjacent two sampled values, and the symbol of first sampled value is positive sign, and second sampled value be negative sign, and then this zero crossing is the negative sense zero crossing; If there is the zero crossing of sample waveform between adjacent two sampled values, and the symbol of first sampled value is negative sign, and second sampled value be positive sign, and then this zero crossing is the positive going zeror crossing point.
In embodiments of the present invention, determined after first zero crossing of sample waveform, added up the sampling number that this zero crossing exists between the next zero crossing, and according to the parameter measurement fundamental frequency of this sampling number and acquisition.
As an alternative embodiment of the invention, this frequency measurement unit 74 comprises first frequency measurement module 741 and second frequency measurement module 742,
This first frequency measurement module 741, the sampled value symbol that is used at the previous sampled point of first zero crossing is timing, uses formula
Determine the fundamental frequency value, this N for this first zero crossing to the sampling number between second zero crossing that is adjacent, this t
sBe the sampling interval between adjacent two sampled points, this Δ t
1Be the interval between the back sampled point of first zero crossing and this first zero crossing, this Δ t
2It is the interval between the previous sampled point of second zero crossing and this second zero crossing.Wherein,
Concrete parameter as shown in Figure 5.
This second frequency measurement module 742 is used at the sampled value symbol of the previous sampled point of first zero crossing using formula when negative
Determine the fundamental frequency value, this M for this first zero crossing to the sampling number between second zero crossing that is adjacent, this t
sBe the sampling interval between adjacent two sampled points, this Δ t
3Be the interval between the previous sampled point of first zero crossing and this first zero crossing, this Δ t
4It is the interval between the previous sampled point of second zero crossing and this second zero crossing.As shown in Figure 5, the Δ t in this formula
3Be equivalent to the Δ t among Fig. 5
2, this Δ t
3Computing formula and above-mentioned (1) in calculate Δ t
2Identical, repeat no more herein.And Δ t
4Can calculate according to the sampled value of linear interpolation method with former and later two sampled points of zero crossing, the sampled value of supposing the previous sampled point of negative sense zero crossing is y
5, the sampled value of a back sampled point is y
6, then
In second embodiment of the invention, the signal of 71 pairs of inputs of sample circuit carries out re-using sampled signal filter unit 72 behind the periodic sampling and carries out corresponding Filtering Processing, zero crossing judging unit 73 is determined the zero crossing of sample waveform and the sampled value of storing former and later two sampled points of this zero crossing according to the sampled value after the Filtering Processing, last frequency measuring unit 74 is determined the sampling number between adjacent two zero crossings again, and measures the frequency values of first-harmonic according to sampling interval, sampled value and sampling number.Owing to before measuring fundamental frequency, carried out the High frequency filter processing, therefore can effectively eliminate the interference of actual electric network harmonic wave in service, improved the accuracy that zero crossing detects, and then the reliability and the accuracy of fundamental frequency are measured in raising, and, only need judge two zero crossings just can calculate fundamental frequency in the embodiment of the invention, under the prerequisite that guarantees the frequency computation part accuracy, has shortened the whole frequency measurement time.
In the embodiment of the invention, signal to input carries out carrying out corresponding Filtering Processing again behind the periodic sampling, and determine the zero crossing of sample waveform and the sampled value of storing former and later two sampled points of this zero crossing according to the sampled value after the Filtering Processing, determine the sampling number between adjacent two zero crossings at last again, and measure the frequency values of first-harmonic according to sampling interval, sampled value and sampling number.Owing to before measuring fundamental frequency, carried out the High frequency filter processing, therefore can effectively eliminate the interference of actual electric network harmonic wave in service, improved the accuracy that zero crossing detects, and then the reliability and the accuracy of fundamental frequency are measured in raising, and, only need judge two zero crossings just can calculate fundamental frequency in the embodiment of the invention, under the prerequisite that guarantees the frequency computation part accuracy, has shortened the whole frequency measurement time.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a grid frequency measurement method is characterized in that, described method comprises the steps:
The signal of equal interval sampling input obtains the sampled signal that sampling interval equates;
Described sampled signal is carried out Filtering Processing;
Determine the zero crossing of sample waveform according to the sampled value after the Filtering Processing, and store the sampled value of former and later two sampled points of described zero crossing;
Determine sampling number between adjacent two zero crossings according to described zero crossing, and according to described sampling interval, sampled value and described sampling number frequency values.
2. the method for claim 1 is characterized in that, the described step that described sampled signal is carried out Filtering Processing is specially:
Use wave digital lowpass filter sampled signal to be carried out low-pass filtering treatment, the high-frequency signal of the described sampled signal of filtering.
3. the method for claim 1 is characterized in that, describedly determines that according to the sampled value after the Filtering Processing step of the zero crossing of sample waveform is specially:
Judge the symbol of adjacent two sampled values;
At the symbol of described adjacent two sampled values not simultaneously, do not determine to exist between described two sampled values the zero crossing of sample waveform;
When the symbol of described adjacent two sampled values is identical, determine not exist between described two sampled values the zero crossing of sample waveform.
4. the method for claim 1 is characterized in that, describedly determines sampling number between adjacent two zero crossings according to described zero crossing, and is specially according to the step of described sampling interval, sampled value and described sampling number frequency values:
Sampled value symbol at the previous sampled point of first zero crossing is timing, uses formula
Determine the fundamental frequency value, described N is that described first zero crossing is to the sampling number between second zero crossing that is adjacent, described t
sBe the sampling interval between adjacent two sampled points, described Δ t
1Be the interval between the back sampled point of first zero crossing and described first zero crossing, described Δ t
2It is the interval between the previous sampled point of second zero crossing and described second zero crossing;
When negative, use formula at the sampled value symbol of the previous sampled point of first zero crossing
Determine the fundamental frequency value, described M is that described first zero crossing is to the sampling number between second zero crossing that is adjacent, described t
sBe the sampling interval between adjacent two sampled points, described Δ t
3Be the interval between the previous sampled point of first zero crossing and described first zero crossing, described Δ t
4It is the interval between the previous sampled point of second zero crossing and described second zero crossing.
5. a grid frequency measurement device is characterized in that, described device comprises:
Sample circuit is used for the signal that equal interval sampling is imported, and obtains the sampled signal that sampling interval equates;
The sampled signal filter unit is used for described sampled signal is carried out Filtering Processing;
The zero crossing judging unit is used for determining according to the sampled value after the Filtering Processing zero crossing of sample waveform, and stores the sampled value of former and later two sampled points of described zero crossing;
Frequency measurement unit is used for determining sampling number between adjacent two zero crossings according to described zero crossing, and according to described sampling interval, sampled value and described sampling number frequency values.
6. device as claimed in claim 5 is characterized in that, described sampled signal filter unit uses wave digital lowpass filter sampled signal to be carried out low-pass filtering treatment, the high-frequency signal of the described sampled signal of filtering.
7. device as claimed in claim 5 is characterized in that, described zero crossing judging unit comprises:
Sampled value symbol decision module is used to judge the symbol of adjacent two sampled values;
There is determination module in zero crossing, is used for determining to exist between described two sampled values the zero crossing of sample waveform at the symbol of described adjacent two sampled values not simultaneously;
There is not determination module in zero crossing, is used for symbol in described adjacent two sampled values when identical, determines not exist between described two sampled values the zero crossing of sample waveform.
8. device as claimed in claim 5 is characterized in that, described frequency measurement unit comprises first frequency measurement module and second frequency measurement module,
Described first frequency measurement module, the sampled value symbol that is used at the previous sampled point of first zero crossing is timing, uses formula
Determine the fundamental frequency value, described N is that described first zero crossing is to the sampling number between second zero crossing that is adjacent, described t
sBe the sampling interval between adjacent two sampled points, described Δ t
1Be the interval between the back sampled point of first zero crossing and described first zero crossing, described Δ t
2It is the interval between the previous sampled point of second zero crossing and described second zero crossing;
Described second frequency measurement module is used at the sampled value symbol of the previous sampled point of first zero crossing using formula when negative
Determine the fundamental frequency value, described M is that described first zero crossing is to the sampling number between second zero crossing that is adjacent, described t
sBe the sampling interval between adjacent two sampled points, described Δ t
3Be the interval between the previous sampled point of first zero crossing and described first zero crossing, described Δ t
4It is the interval between the previous sampled point of second zero crossing and described second zero crossing.
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