CN109302165A - A method of the rapidly extracting DC component amplitude from the signal that frequency AC ripple is determined in superposition - Google Patents
A method of the rapidly extracting DC component amplitude from the signal that frequency AC ripple is determined in superposition Download PDFInfo
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- CN109302165A CN109302165A CN201811017340.XA CN201811017340A CN109302165A CN 109302165 A CN109302165 A CN 109302165A CN 201811017340 A CN201811017340 A CN 201811017340A CN 109302165 A CN109302165 A CN 109302165A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0211—Frequency selective networks using specific transformation algorithms, e.g. WALSH functions, Fermat transforms, Mersenne transforms, polynomial transforms, Hilbert transforms
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H2017/0072—Theoretical filter design
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Abstract
The invention belongs to electrical engineering technical fields, and in particular to a method of the rapidly extracting DC component amplitude from the signal that frequency AC ripple is determined in superposition.Include the following steps: that obtained S will be sampled1ASignal is sent into the filter of 90 ° of phase shift of lag, obtains S1B；By S1AAnd S1BColumn vector is constituted, using principle of coordinate transformation, the static coordinate transform to two-phase rotation of two-phase is carried out, obtains new signal S2AAnd S2B；By S2BAgain by 90 ° of phase shift of filter of lag, signal S is obtained3B；By S2BAnd S3BSignal constitutes column vector, utilizes the static coordinate transform C to two-phase rotation of two-phase again2S/2R, obtain new signal S4AAnd S4B, then S obtained4AFor direct current signal, represent in original signal S1AContained in DC component amplitude.The present invention extracts DC component using the principle of phase shift and coordinate transform, relative to the mode that tradition is filtered based on low-pass filter, can more quickly extract DC component amplitude information from being mixed in the signal for determining frequency AC compounent.
Description
Technical field
The invention belongs to electrical engineering technical fields, and in particular to a kind of quick from the signal that frequency AC ripple is determined in superposition
The method for extracting DC component amplitude.
Background technique
In the occasion for carrying out single-phase grid-connected inversion or single-phase rectifier using converters, converter DC side is logical
Often with the ripple component i.e. 100Hz for having two frequency multiplication of network voltage, this ripple component is to DC power supply itself such as fuel cell or control
Performance processed is such as needing the occasion for carrying out MPPT control to may cause the different degrees of oscillation of MPPT algorithm with centainly negative
It influences, it is therefore desirable to remove it by control method.In these control algolithms, need to extract AC ripple component mostly
Amplitude, conventional method are realized using the method based on low-pass filter.Since 100Hz AC signal frequency is relatively low, filter
Wave device needs to be arranged lower, and the performance of time delay effect is obvious, and AC compounent obtained in this way is compared with the AC compounent in original signal
With certain phase deviation, the control effect of practical Ripple Suppression is influenced whether.
Summary of the invention
The purpose of the present invention is to provide a kind of rapidly extracting DC component width from the signal that frequency AC ripple is determined in superposition
The method of value.
A method of the rapidly extracting DC component amplitude from the signal that frequency AC ripple is determined in superposition, including walk as follows
It is rapid:
1, superposition is determined to the signal S of frequency AC ripple1AIt is sent into the filter for lagging 90 ° of phase shift, obtains S1B。
2, by S1AAnd S1BColumn vector is constituted, using principle of coordinate transformation, carries out the static coordinate change to two-phase rotation of two-phase
It changes, obtains two new signals, be denoted as: S2AAnd S2B。
3, by S2BAgain by 90 ° of phase shift of filter of lag, signal S is obtained3B。
4, by S2BAnd S3BSignal constitutes column vector, utilizes the static coordinate transform C to two-phase rotation of two-phase again2S/2R, obtain
The signal S new to two4AAnd S4B, it may be assumed that [S4A S4B]T=C2S/2R[S2B S3B]T；Then S obtained4AFor direct current signal, generation
Table is in original signal S1AContained in DC component amplitude.
It is described a kind of from the method for being superimposed rapidly extracting DC component amplitude in the signal for determining frequency AC ripple, step 1
The filter formula of 90 ° of phase shift of lag are as follows:
Wherein ω0For the angular frequency of AC signal.
It is described a kind of from the method for being superimposed rapidly extracting DC component amplitude in the signal for determining frequency AC ripple, step 2
Carrying out the static specific formula of coordinate transform rotated to two-phase of two-phase is
[S2A S2B]T=C2S/2R[S1A S1B]T
C2S/2RFor transformation matrix.
The beneficial effects of the present invention are:
The present invention extracts DC component using the principle of phase shift and coordinate transform, is based on low-pass filter relative to tradition
The mode of filtering, this method can more quickly mention DC component amplitude information from being mixed in the signal for determining frequency AC compounent
The DC component taken out, and obtained is compared with the DC component in original signal without phase deviation.This method is simple and easy, accuracy
Height, it is practical.
Detailed description of the invention
Attached drawing 1 is the schematic diagram of patent the method；
Attached drawing 2 is the comparison diagram that DC component is obtained using patent the method and conventional lowpass filter method.
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
It as shown in Fig. 1, is the schematic diagram of patent the method, the signal such as attached drawing of frequency AC ripple is determined in the superposition
In 1 dotted line frame shown in part.
Superposition is determined to the signal S of frequency AC ripple1AIt is sent into the filter (1) for carrying out 90 ° of phase shift of lag
Obtain signal S1B, wherein ω0For the angular frequency of AC signal.Later by S1AAnd S1BColumn vector is constituted, coordinate is utilized
Shift theory carries out the static coordinate transform to two-phase rotation of two-phase, obtains two new signals, be denoted as: S2AAnd S2B.That is:
[S2A S2B]T=C2S/2R[S1A S1B]T, C2S/2RFor transformation matrix.
By S2BAgain by 90 ° of phase shift of lag of filters (1), signal S is obtained3B, by S2BAnd S3BSignal constitute column to
Amount utilizes the static coordinate transform C to two-phase rotation of two-phase again2S/2R, obtain two new signal S4AAnd S4B.That is: [S4A
S4B]T=C2S/2R[S2B S3B]T.Then S obtained4AFor direct current signal, represent in original signal S1AContained in direct current point
The amplitude of amount.
As shown in Fig. 2, comparison diagram direct current signal extracted for patent the method and conventional lowpass filter method.It is former
Beginning signal communication component amplitude is 100 units, and DC component is 200 constituent parts.By processing result as it can be seen that using 50Hz bandwidth
Second-order low-pass filter can not reject AC compounent completely；Although the second-order low-pass filter using 10Hz bandwidth can obtain
To the direct current signal of ripple very little, but stationary filtering output signal time-consuming needs about 100ms；Using patent the method,
Under shown display scale, direct current signal obtained almost ripple-free, and the time for obtaining stable DC component significantly reduces
To about 8ms.
Claims (3)
1. a kind of method of the rapidly extracting DC component amplitude from the signal that frequency AC ripple is determined in superposition, which is characterized in that packet
Include following steps:
Step 1, the signal S that superposition is determined to frequency AC ripple1AIt is sent into the filter for lagging 90 ° of phase shift, obtains S1B；
Step 2, by S1AAnd S1BColumn vector is constituted, using principle of coordinate transformation, carries out the static coordinate change to two-phase rotation of two-phase
It changes, obtains two new signals, be denoted as: S2AAnd S2B；
Step 3, by S2BAgain by 90 ° of phase shift of filter of lag, signal S is obtained3B；
Step 4, by S2BAnd S3BSignal constitutes column vector, utilizes the static coordinate transform C to two-phase rotation of two-phase again2S/2R, obtain
The signal S new to two4AAnd S4B, it may be assumed that [S4A S4B]T=C2S/2R[S2B S3B]T；Then S obtained4AFor direct current signal, generation
Table is in original signal S1AContained in DC component amplitude.
2. a kind of side of the rapidly extracting DC component amplitude from the signal that frequency AC ripple is determined in superposition according to claim 1
Method, it is characterised in that: the filter formula of 90 ° of phase shift of lag described in step 1 are as follows:
Wherein ω0For the angular frequency of AC signal.
3. a kind of rapidly extracting DC component amplitude from the signal that frequency AC ripple is determined in superposition according to claim 1
Method, it is characterised in that: the static specific formula of coordinate transform rotated to two-phase of two-phase is carried out described in step 2 is
[S2A S2B]T=C2S/2R[S1A S1B]T
C2S/2RFor transformation matrix.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811017340.XA CN109302165A (en) | 2018-09-01 | 2018-09-01 | A method of the rapidly extracting DC component amplitude from the signal that frequency AC ripple is determined in superposition |
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| CN201811017340.XA CN109302165A (en) | 2018-09-01 | 2018-09-01 | A method of the rapidly extracting DC component amplitude from the signal that frequency AC ripple is determined in superposition |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472302A (en) * | 2013-09-16 | 2013-12-25 | 宁夏隆基宁光仪表有限公司 | Method for using one-phase photovoltaic grid-connected inverter to detect network voltage phase |
| CN103490772A (en) * | 2013-09-30 | 2014-01-01 | 中船重工鹏力（南京）新能源科技有限公司 | Sliding weighting single-phase soft phase locking method based on reactive compensation |
| CN108400596A (en) * | 2018-05-15 | 2018-08-14 | 扬州大学 | A kind of fractional harmonic wave detection method in single-phase active power filter system and the active filter control method based on the detection method |
-
2018
- 2018-09-01 CN CN201811017340.XA patent/CN109302165A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472302A (en) * | 2013-09-16 | 2013-12-25 | 宁夏隆基宁光仪表有限公司 | Method for using one-phase photovoltaic grid-connected inverter to detect network voltage phase |
| CN103490772A (en) * | 2013-09-30 | 2014-01-01 | 中船重工鹏力（南京）新能源科技有限公司 | Sliding weighting single-phase soft phase locking method based on reactive compensation |
| CN108400596A (en) * | 2018-05-15 | 2018-08-14 | 扬州大学 | A kind of fractional harmonic wave detection method in single-phase active power filter system and the active filter control method based on the detection method |
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Application publication date: 20190201 |