CN106771597B - A kind of no phase-locked loop formula SAI harmonic current detecting method omitting Park transformation - Google Patents
A kind of no phase-locked loop formula SAI harmonic current detecting method omitting Park transformation Download PDFInfo
- Publication number
- CN106771597B CN106771597B CN201710124714.7A CN201710124714A CN106771597B CN 106771597 B CN106771597 B CN 106771597B CN 201710124714 A CN201710124714 A CN 201710124714A CN 106771597 B CN106771597 B CN 106771597B
- Authority
- CN
- China
- Prior art keywords
- phase
- sai
- positive sequence
- locked loop
- harmonic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of no phase-locked loop formula SAI harmonic current detecting methods of omission Park transformation, in traditional ip‑iqPark transformation and phase-locked loop are omitted on the basis of method and the low-pass filter in original system is substituted for sinusoidal magnitude value integrator, to enormously simplify the structure of system.Link is extracted with the fundamental positive sequence of SAI and substitutes LPF, under conditions of only extracting fundamental positive sequence, is carried out total current compensation, is improved the accuracy of harmonic current compensation.Whole system is because LPF link by SAI substitution, omission phase-locked loop and Park transform part, so that the rapidity of system response increases, forms a kind of accurate, quick and extremely easy Harmonic detection.This method has excellent performance in numerous Harmonic detections, there is boundless application prospect in active power filtering field.
Description
Technical field
The present invention relates to power inverter modulation control field, especially a kind of no phase-locked loop formula omitted under Park transformation
Harmonic currents detection method.
Background technique
The generally use of power electronic equipment and nonlinear load, makes harmonic current largely inject power grid, seriously affects electricity
The safe operation of net, therefore introduce Active Power Filter-APF (Active Power Filter-APF) and carry out harmonics restraint.Its
Basic principle is that harmonic wave is detected from target compensation, by compensation device generate one with the harmonic current is equal in magnitude and polarity
Opposite compensation electric current, so that the harmonic current in power grid be made to be filtered out.So the key link that APF carries out harmonics restraint is
The detection of harmonic current.
Current main Harmonic detection has: the detection method based on Fourier transformation is based on instantaneous reactive power theory
Detection method, detection method neural network based, be based on wavelet analysis detection method, the detection method based on filter
Deng, and the i on the basis of instantaneous reactive power theory is built upon using more extensive harmonic current detecting methodp-iqMethod, should
Method converts on the basis of application phaselocked loop by Clark and Park, fundamental current is obtained using low-pass filter, to mention
Take harmonic current.
Summary of the invention
Nothing that is simple, tracking accurate, fast response time omission Park transformation that it is an object of that present invention to provide a kind of structures
PLL SAI harmonic current detecting method.
To achieve the above object, use following technical scheme: steps are as follows for the method for the invention:
Step 1, simplifying ip-iqIn the case where method system structure, load-side three-phase current is extracted, is converted by Clark
Operation obtains the electric current under two-phase stationary coordinate system;
Step 2, the extraction of SAI link fundamental positive sequence is carried out to the electric current under two-phase stationary coordinate system;
Step 3, the operation of Clark inverse transformation is carried out to the fundamental positive sequence electric current extracted, obtains the fundamental positive sequence electricity of three-phase
Stream;
Step 4, harmonic current is extracted on the basis of three-phase fundamental positive sequence electric current.
Compared with prior art, the method for the present invention has the advantages that
1, Park transform part is eliminated, the structure of system is simplified and increases the accurate of system to a certain extent
Property.
2, the present invention is the detection method of no phase-locked loop, has simplified the structure of system, has increased the rapidity of system.
3, harmonic current is extracted and obtained to fundamental positive sequence electric current using SAI link, so that the extraction of harmonic current
More accurately and quickly.
Detailed description of the invention
Fig. 1 is overall structure block diagram of the present invention.
Fig. 2 is traditional ip-iqMethod structural block diagram.
Fig. 3 is the SAI schematic diagram of positive sequence.
Fig. 4 is the amplitude-frequency characteristic figure of fundamental positive sequence.
Fig. 5 is the SAI schematic diagram of negative phase-sequence.
Fig. 6 is the amplitude-frequency characteristic figure of fundamental wave negative sequence.
Fig. 7 is the SAI filter structure block diagram of fundamental frequency of the invention.
Fig. 8 is the acquisition figure of harmonic current of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
Steps are as follows for the method for the invention:
Step 1, simplifying ip-iqIn the case where method system structure, load-side three-phase current is extracted, is converted by Clark
Operation obtains the electric current under two-phase stationary coordinate system;
Step 2, the extraction of SAI link fundamental positive sequence is carried out to the electric current under two-phase stationary coordinate system;
Step 3, the operation of Clark inverse transformation is carried out to the fundamental positive sequence electric current extracted, obtains the fundamental positive sequence electricity of three-phase
Stream;
Step 4, harmonic current is extracted on the basis of three-phase fundamental positive sequence electric current.
As shown in Figure 1, being the entire block diagram of system, threephase load electric current ia、ib、icUnder Clark transformation, two-phase is formed
Electric current i under rest frameα、iβ, fundamental positive sequence electric current i is extracted by SAI link+ α1、i+ β1, then pass through Clark contravariant
Get three-phase fundamental positive sequence electric current i in return+ α1、i+ b1、i+ c1, finally harmonic current i is obtained by operationaf、ibf、icf, to realize
Total current compensation.
Fig. 2 is traditional ip-iqThe structural block diagram of method, threephase load electric current ia、ib、icUnder Clark transformation, two-phase is formed
Electric current i under rest frameα、iβ, converted via the phase angle of phaselocked loop output voltage for Park, by low-pass filter pair
The transformed electric current i of Parkp、iqIt is filtered, obtains the DC component of the electric current under two-phase rotating coordinate systemThen
By Park, Clark inverse transformation, the fundamental current i of three-phase is formedaf、ibf、icf, finally obtain harmonic current i* ca、i* cb、i* cc.With
Fig. 1 is compared, and systematic comparison is complicated, is increased phaselocked loop and Park transform part, is made the accuracy of system to a certain extent
It reduces, and the use of low-pass filter plays time-lag action to system.For disadvantage mentioned above, the invention proposes a kind of provinces
The slightly no phase-locked loop formula SAI Harmonic currents detection method of Park transformation, enormously simplifies the structure of system, increases the quick of system
Property etc..
Fig. 3 is the SAI schematic diagram of positive sequence.Using the SAI extraction method of positive sequence, fundamental positive sequence is extracted, it can be with
The fundamental positive sequence electric current under the no phase-locked loop formula SAI Harmonic currents detection method for omitting Park transformation is obtained, is mentioned for harmonic current
It takes and lays a good foundation.
Fig. 4 is the amplitude-frequency characteristic figure of fundamental positive sequence.It can be seen that by the amplitude-frequency characteristic figure of fundamental positive sequence in center angular frequency
Place has resonance peak, all has attenuation for the signal of other frequencies, and the positive-sequence component of 50Hz is selected with polarity
Select effect.
Fig. 5 is the SAI schematic diagram of negative phase-sequence.Similarly, fundamental wave negative sequence component can be mentioned using the SAI schematic diagram of negative phase-sequence
It takes.
Fig. 6 is the amplitude-frequency characteristic figure of fundamental wave negative sequence.As the π of ω=- 100, since SAI is -50Hz's for input signal
Negative-sequence signals have the ability of polarity selection, have filter action to the signal of other frequencies.Therefore SAI structure is that one kind has
Polarity selects the bandpass filter of characteristic, can be applied to the Harmonic currents detection of active filter.
Fig. 7 is the SAI filter structure block diagram of fundamental frequency of the invention.The fundamental positive sequence electric current i extracted with SAI+ α1、i+ β1By total current iα、iβAfter making the difference, using SAI fundamental extraction link, while the fundamental positive sequence electric current i extracted+ α1、i+ β1
Output.In this way, turning again to while output by total current iα、iβLink is made the difference, so recycles, extracts more accurate fundamental wave
Forward-order current i+ α1、i+ β1。
Fig. 8 is that harmonic current of the invention obtains figure.By to fundamental positive sequence electric current i+ α1、i+ β1Extraction repeatedly, carry out
Operation makes threephase load electric current iabcSubtract three-phase fundamental positive sequence electric current i+ abc1Obtain more accurately harmonic current i* abc。
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (1)
1. a kind of no phase-locked loop formula SAI harmonic current detecting method for omitting Park transformation, which is characterized in that the method step
It is as follows:
Step 1, simplifying ip-iqIn the case where method system structure, load-side three-phase current is extracted, converts and transports by Clark
It calculates, obtains the electric current under two-phase stationary coordinate system;
Step 2, the extraction of SAI link fundamental positive sequence is carried out to the electric current under two-phase stationary coordinate system;
Step 3, the operation of Clark inverse transformation is carried out to the fundamental positive sequence electric current extracted, obtains the fundamental positive sequence electric current of three-phase;
Step 4, harmonic current is extracted on the basis of three-phase fundamental positive sequence electric current.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710124714.7A CN106771597B (en) | 2017-03-03 | 2017-03-03 | A kind of no phase-locked loop formula SAI harmonic current detecting method omitting Park transformation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201710124714.7A CN106771597B (en) | 2017-03-03 | 2017-03-03 | A kind of no phase-locked loop formula SAI harmonic current detecting method omitting Park transformation |
Publications (2)
Publication Number | Publication Date |
---|---|
CN106771597A CN106771597A (en) | 2017-05-31 |
CN106771597B true CN106771597B (en) | 2019-04-09 |
Family
ID=58960895
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201710124714.7A Active CN106771597B (en) | 2017-03-03 | 2017-03-03 | A kind of no phase-locked loop formula SAI harmonic current detecting method omitting Park transformation |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN106771597B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108957130B (en) * | 2018-07-27 | 2021-01-08 | 中国南方电网有限责任公司 | Electric power system harmonic detection method based on instantaneous reactive power theory |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102522751A (en) * | 2011-12-27 | 2012-06-27 | 沈阳工业大学 | Control method for actively suppressing power grid harmonics |
CN103929109B (en) * | 2014-05-12 | 2016-06-29 | 哈尔滨工业大学 | A kind of high-power internal permanent magnet synchronous motor control system without position sensor and control method |
CN105158592B (en) * | 2015-07-09 | 2018-01-12 | 中国矿业大学 | Three phase network impedance real-time detection method under power network asymmetrical |
CN105182072B (en) * | 2015-10-09 | 2018-06-01 | 国家电网公司 | A kind of harmonic detecting method and system based on the virtual filtered factor |
-
2017
- 2017-03-03 CN CN201710124714.7A patent/CN106771597B/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN106771597A (en) | 2017-05-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN102305886B (en) | Fundamental voltage synchronous signal detection method during harmonic distortion and unbalance of network voltage | |
CN105449718B (en) | The grid-connected genlock method of algorithm is offseted based on the delay of modified series signals | |
CN102401858A (en) | Method for detecting fundamental component and harmonic component of voltage of power grid | |
CN103487652B (en) | Frequency self-adaptive real-time fractional harmonic wave detection method | |
CN106027038B (en) | A kind of improved three-phase phase-lock-loop algorithm based on time delayed signal null method | |
CN107632200B (en) | Harmonic detection method based on discrete Fourier transform | |
CN105790758B (en) | A kind of improvement phase-lock-loop algorithm based on the filter that is delayed under mixed proportion | |
CN109245103B (en) | Software phase-locked loop implementation method and device based on improved sliding mean filter | |
CN102590646A (en) | Method for detecting positive sequence, negative sequence and harmonic current based on phase sequence filter | |
CN110557118B (en) | Phase locking device and phase locking method | |
CN107423261B (en) | Separation method of positive and negative sequence components based on OVPR under non-ideal microgrid condition | |
CN109412191A (en) | Phase locking method, device and equipment for high-voltage direct-current power transmission system | |
CN110165706A (en) | A kind of adaptive three-phase grid converter phaselocked loop and its locking phase control method | |
CN107591809A (en) | Multicycle parallel connection Repetitive controller harmonic wave and m-Acetyl chlorophosphonazo specify time compensation method | |
CN109510619A (en) | Enhanced phaselocked loop for the detection of single-phase mains voltage synchronizing information | |
CN104833853B (en) | A kind of adaptive sliding window DFT harmonic detecting methods of frequency | |
CN104698254A (en) | Grid fundamental positive sequence voltage extracting method and phase-locking method | |
CN112595891B (en) | Method for detecting higher harmonic of power system | |
CN103472302A (en) | Method for using one-phase photovoltaic grid-connected inverter to detect network voltage phase | |
CN106959385A (en) | The Harmonic currents detection method of phase is locked during unbalanced source voltage based on two frequencys multiplication | |
CN108809301B (en) | Three-phase software phase locking method based on sliding DFT filtering principle | |
CN106771597B (en) | A kind of no phase-locked loop formula SAI harmonic current detecting method omitting Park transformation | |
CN117439179A (en) | Grid-connected converter grid synchronous control method based on biquad generalized integrator | |
CN112269052A (en) | Harmonic and reactive current detection method | |
CN107703358A (en) | A kind of phase locked algorithm based on improvement Second Order Generalized Integrator |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |