CN110361596A - A kind of Resonance detector strategy based on zero-crossing examination - Google Patents
A kind of Resonance detector strategy based on zero-crossing examination Download PDFInfo
- Publication number
- CN110361596A CN110361596A CN201910528159.3A CN201910528159A CN110361596A CN 110361596 A CN110361596 A CN 110361596A CN 201910528159 A CN201910528159 A CN 201910528159A CN 110361596 A CN110361596 A CN 110361596A
- Authority
- CN
- China
- Prior art keywords
- resonance
- zero
- point
- crossing examination
- amplitude
- 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.)
- Pending
Links
Classifications
-
- 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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
-
- 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
- G01R23/06—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into an amplitude of current or voltage
-
- 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
Abstract
The invention discloses a kind of Resonance detector strategy based on zero-crossing examination, comprising the following steps: step S1: acquisition NsizeA current data point；Step S2: by the N of acquisitionsizeA current data point carries out fitting of a polynomial and obtains Iq_t(x)；Step S3: adjacent two sampled points I is successively takenq(i) and Iq(i+1)；Step S4: judge Iq_tWhether ((2i+1)/2) be in sampled point Iq(i) and Iq(i+1) between；Step S5: by calculating sampled point Iq(i) and Iq(i+1) average value with the absolute value of the difference of respective point in matched curve obtains resonance amplitude；Step S6: according to respective threshold judge system whether resonance；Step S7: output judges signal.Resonance detector strategy disclosed by the invention based on zero-crossing examination, which can be realized, continuously detects system resonance frequencies, amplitude, avoids detection process by the interference of unknown frequency harmonic wave.
Description
Technical field
The invention belongs to electric electronic current change technology fields, and in particular to a kind of Resonance detector plan based on zero-crossing examination
Slightly.
Background technique
In existing resonance oscillation detection technique, Modified Discrete fourier transform method, based on adaptive notch filter frequency locking it is around-France
(Adaptive notch filter-based frequency locked loop, ANF-Based-FLL) can only detect detection
Single resonance frequency out, and Modified Discrete fourier transform method have the shortcomings that it is computationally intensive, when detecting multiple resonance frequencies
In parallel or cascade ANF-FLL method can only be used, but can only detect integral frequency harmonizing wave and vulnerable to the humorous of unknown frequency
Wave interference, therefore be further improved.
Summary of the invention
The main purpose of the present invention is to provide a kind of Resonance detector strategy based on zero-crossing examination, can be realized pair
System resonance frequencies, amplitude continuously detect, and avoid detection process by the interference of unknown frequency harmonic wave.
Another object of the present invention is to provide a kind of Resonance detector strategy based on zero-crossing examination mainly passes through
The I that detection inverter output current obtains after Park Transformationd、IqVariation to realize the detection to system resonance.
To achieve the above objectives, the present invention provides a kind of Resonance detector strategy based on zero-crossing examination, including following step
It is rapid:
Step S1: acquisition NsizeA current data point；
Step S2: by the N of acquisitionsizeA current data point carries out fitting of a polynomial and obtains Iq_t(x)；
Step S3: adjacent two sampled points I is successively takenq(i) and Iq(i+1)；
Step S4: judge Iq_tWhether ((2i+1)/2) be in sampled point Iq(i) and Iq(i+1) between；
Step S5: by calculating sampled point Iq(i) and Iq(i+1) in matched curve the absolute value of the difference of respective point it is flat
Mean value obtains resonance amplitude；
Step S6: according to respective threshold judge system whether resonance；
Step S7: output judges signal.
Further preferred technical solution as above-mentioned technical proposal, step S2 the following steps are included:
Step S2.1: it enablesThen g0(x)=a0,
Then g1(x)=g0(x)+a1p1(x)；
Step S2.2:
Step S2.3: the multinomial of fitting is g2(x)=g1(x)+a2p2(x), i.e. Iq_t(x)=g2(x)。
Further preferred technical solution as above-mentioned technical proposal, step S4 the following steps are included:
Step S4.1: according to formulaJudge two neighbouring sample points
Iq(i) and Iq(i+1) line whether and Iq_t(x) there is intersection point；
Step S4.2: according to formula N=2NsizefwfsCalculate the frequency of resonance；
Step S4.3: sampled point and I are calculatedq_t(x) average value of the absolute value of the difference of respective point on；
Step S4.4: according to formulaCalculate the amplitude of resonance, wherein N was mean point
Number, NsizeFor sampling number, fw is resonance frequency, and Uw is resonance amplitude, and fs is sample frequency.
Further preferred technical solution as above-mentioned technical proposal, step S6 are further comprising the steps of:
Step S6.1: step S7 is carried out if judging that system is resonance according to respective threshold；
Step S6.2: S1 is re-execute the steps if judging that system is not resonance according to respective threshold.
Further preferred technical solution as above-mentioned technical proposal, the Resonance detector plan based on zero-crossing examination
Slightly by the consecutive variations of zero crossing number to detect multiple resonance frequencies and amplitude.
Further preferred technical solution as above-mentioned technical proposal, the sampled point are that system output current carries out 3/
2 variations obtain.
Detailed description of the invention
Fig. 1 is the algorithm flow chart of the Resonance detector strategy based on zero-crossing examination of the preferred embodiment of the present invention.
Specific embodiment
It is described below for disclosing the present invention so that those skilled in the art can be realized the present invention.It is excellent in being described below
Embodiment is selected to be only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.It defines in the following description
Basic principle of the invention can be applied to other embodiments, deformation scheme, improvement project, equivalent program and do not carry on the back
Other technologies scheme from the spirit and scope of the present invention.
The invention discloses the Resonance detector strategies based on zero-crossing examination, below with reference to preferred embodiment, to invention
Specific embodiment is further described.
Referring to Figure 1 of the drawings, Fig. 1 shows the Resonance detector plan based on zero-crossing examination of the preferred embodiment of the present invention
Algorithm flow chart slightly.
Preferred embodiment.
In this preferred embodiment of the invention, those skilled in the art note that it is according to the present invention 3/2 variation,
Fitting of a polynomial etc. can be considered as the prior art.
The invention discloses the Resonance detector strategies based on zero-crossing examination, comprising the following steps:
Step S1: acquisition NsizeA current data point；
Step S2: by the N of acquisitionsizeA current data point carries out fitting of a polynomial and obtains Iq_t(x)；
Step S3: adjacent two sampled points I is successively takenq(i) and Iq(i+1)；
Step S4: judge Iq_tWhether ((2i+1)/2) be in sampled point Iq(i) and Iq(i+1) between；
Step S5: by calculating sampled point Iq(i) and Iq(i+1) in matched curve the absolute value of the difference of respective point it is flat
Mean value obtains resonance amplitude；
Step S6: according to respective threshold judge system whether resonance；
Step S7: output judges signal.
Further, step S2 the following steps are included:
Step S2.1: it enablesThen g0(x)=a0,
Then g1(x)=g0(x)+a1p1(x)；
Step S2.2:
Step S2.3: the multinomial of fitting is g2(x)=g1(x)+a2p2(x), i.e. Iq_t(x)=g2(x)。
Moreover, step S4 the following steps are included:
Step S4.1: according to formulaJudge two neighbouring sample points
Iq(i) and Iq(i+1) line whether and Iq_t(x) there is intersection point；
Step S4.2: according to formula N=2NsizefwfsCalculate the frequency of resonance；
Step S4.3: sampled point and I are calculatedq_t(x) average value of the absolute value of the difference of respective point on；
Step S4.4: according to formulaCalculating the amplitude of resonance, wherein N was average value points,
NsizeFor sampling number, fw is resonance frequency, and Uw is resonance amplitude, and fs is sample frequency.
Preferably, step S6 is further comprising the steps of:
Step S6.1: step S7 is carried out if judging that system is resonance according to respective threshold；
Step S6.2: S1 is re-execute the steps if judging that system is not resonance according to respective threshold.
Particularly, the Resonance detector strategy based on zero-crossing examination by the consecutive variations of zero crossing number to
Detect multiple resonance frequencies and amplitude.
More particularly, the sampled point is that 3/2 variation of system output current progress obtains.
First embodiment.
The invention discloses the Resonance detector strategies based on zero-crossing examination, comprising the following steps:
Step S1: acquisition NsizeA current data point；
Step S2: by the N of acquisitionsizeA current data point carries out fitting of a polynomial and obtains Iq_t(x)；
Step S3: adjacent two sampled points I is successively takenq(i) and Iq(i+1)；
Step S4: judge Iq_tWhether ((2i+1)/2) be in sampled point Iq(i) and Iq(i+1) between；
Step S5: by calculating sampled point Iq(i) and Iq(i+1) in matched curve the absolute value of the difference of respective point it is flat
Mean value obtains resonance amplitude；
Step S6: according to respective threshold judge system whether resonance；
Step S7: output judges signal.
Further, step S2 the following steps are included:
Step S2.1: it enablesThen g0(x)=a0,
Then g1(x)=g0(x)+a1p1(x)；
Step S2.2:
Step S2.3: the multinomial of fitting is g2(x)=g1(x)+a2p2(x), i.e. Iq_t(x)=g2(x)。
Moreover, step S4 the following steps are included:
Step S4.1: according to formulaJudge two neighbouring sample points
Iq(i) and Iq(i+1) line whether and Iq_t(x) there is intersection point；
Step S4.2: according to formula N=2NsizefwfsCalculate the frequency of resonance；
Step S4.3: sampled point and I are calculatedq_t(x) average value of the absolute value of the difference of respective point on；
Step S4.4: according to formulaCalculate the amplitude of resonance, wherein N was mean point
Number, NsizeFor sampling number, fw is resonance frequency, and Uw is resonance amplitude, and fs is sample frequency.
Preferably, step S6 is further comprising the steps of:
Step S6.1: step S7 is carried out if judging that system is resonance according to respective threshold；
Step S6.2: step S1 is re-started if judging that system is not resonance according to respective threshold.
Particularly, the Resonance detector strategy based on zero-crossing examination by the consecutive variations of zero crossing number to
Detect multiple resonance frequencies and amplitude.
More particularly, the sampled point is that 3/2 variation of system output current progress obtains.
Preferably, the Resonance detector strategy disclosed by the invention based on zero-crossing examination applies the method in gird-connected inverter
Are as follows:
1. acquisition three-phase, which exports electric current and carries out Park Transformation, obtains Id、Iq；
2. the I that will be obtainedd、IqIt is sent into Resonance detector program；
3. obtaining the frequency f of system resonance by Resonance detectorwWith amplitude Uw。
It is noted that the technical characteristics such as 3/2 variation, fitting of a polynomial that present patent application is related to should be considered as
The prior art, specific structure, working principle and the control mode that may relate to, the space layout mode of these technical characteristics
It using the conventional selection of this field, is not construed as where the inventive point of the invention patent, the invention patent is not done into one
The specific expansion of step is described in detail.
For a person skilled in the art, technical solution documented by foregoing embodiments can still be repaired
Change or equivalent replacement of some of the technical features, it is all within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should be included in protection scope of the present invention.
Claims (6)
1. a kind of Resonance detector strategy based on zero-crossing examination, which comprises the following steps:
Step S1: acquisition NsizeA current data point；
Step S2: by the N of acquisitionsizeA current data point carries out fitting of a polynomial and obtains Iq_t(x)；
Step S3: adjacent two sampled points I is successively takenq(i) and Iq(i+1)；
Step S4: judge Iq_tWhether ((2i+1)/2) be in sampled point Iq(i) and Iq(i+1) between；
Step S5: by calculating sampled point Iq(i) and Iq(i+1) with matched curve on respective point absolute value of the difference average value
Obtain resonance amplitude；
Step S6: according to respective threshold judge system whether resonance；
Step S7: output judges signal.
2. a kind of Resonance detector strategy based on zero-crossing examination according to claim 1, which is characterized in that step S2 packet
Include following steps:
Step S2.1: it enablesThen g0(x)=a0,
p1(x)=x- α0,
Then g1(x)=g0(x)+a1p1(x)；
Step S2.2:
Step S2.3: the multinomial of fitting is g2(x)=g1(x)+a2p2(x), i.e. Iq_t(x)=g2(x)。
3. a kind of based on the humorous of zero-crossing examination according to claim 1 or described in any one of claim 2 claim
Shake inspection policies, which is characterized in that step S4 the following steps are included:
Step S4.1: according to formulaJudge two neighbouring sample point Iq(i)
And Iq(i+1) line whether and Iq_t(x) there is intersection point；
Step S4.2: according to formula N=2NsizefwfsCalculate the frequency of resonance；
Step S4.3: sampled point and I are calculatedq_t(x) average value of the absolute value of the difference of respective point on；
Step S4.4: according to formulaCalculate the amplitude of resonance, wherein N was average value points, Nsize
For sampling number, fw is resonance frequency, and Uw is resonance amplitude, and fs is sample frequency.
4. a kind of Resonance detector strategy based on zero-crossing examination according to claim 1, which is characterized in that step S6 is also
The following steps are included:
Step S6.1: step S7 is carried out if judging that system is resonance according to respective threshold；
Step S6.2: S1 is re-execute the steps if judging that system is not resonance according to respective threshold.
5. a kind of Resonance detector strategy based on zero-crossing examination according to claim 1, which is characterized in that described to be based on
The Resonance detector strategy of zero-crossing examination detects multiple resonance frequencies and amplitude by the consecutive variations of zero crossing number.
6. a kind of Resonance detector strategy based on zero-crossing examination according to claim 1, which is characterized in that the sampling
Point is that 3/2 variation of system output current progress obtains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910528159.3A CN110361596A (en) | 2019-06-18 | 2019-06-18 | A kind of Resonance detector strategy based on zero-crossing examination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910528159.3A CN110361596A (en) | 2019-06-18 | 2019-06-18 | A kind of Resonance detector strategy based on zero-crossing examination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110361596A true CN110361596A (en) | 2019-10-22 |
Family
ID=68216337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910528159.3A Pending CN110361596A (en) | 2019-06-18 | 2019-06-18 | A kind of Resonance detector strategy based on zero-crossing examination |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110361596A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600487A (en) * | 2020-03-14 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Control strategy for improving DCDC efficiency of charging station energy router system |
Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1139711A (en) * | 1966-11-30 | 1969-01-15 | Standard Telephones Cables Ltd | Apparatus for analysing complex waveforms |
| US4441368A (en) * | 1982-04-19 | 1984-04-10 | General Electric Company | Method and means for determining ultrasonic wave attenuation in tissue |
| CN1571613A (en) * | 2003-03-07 | 2005-01-26 | 电灯专利信托有限公司 | Method and apparatus for determining the resonant frequency of a resonant circuit |
| CN1573107A (en) * | 2003-05-26 | 2005-02-02 | Lg电子株式会社 | Apparatus and method for controlling operation of a reciprocating compressor |
| CN101025155A (en) * | 2006-02-07 | 2007-08-29 | 通用电气公司 | Systems and methods for detecting suction valve closure |
| US20100064809A1 (en) * | 2008-09-13 | 2010-03-18 | Kenji Toga | System and Method to Determine Mechanical Resonance of an Accelerometer |
| CN101806832A (en) * | 2010-04-15 | 2010-08-18 | 南京邮电大学 | Measuring method for frequencies of low-frequency signals |
| US20100250169A1 (en) * | 2009-03-24 | 2010-09-30 | Boeing Company, A Corporation Of The State Of Delaware | Method and apparatus for evaluating data representing a plurality of excitations of a plurality of sensors |
| CN102243272A (en) * | 2011-04-01 | 2011-11-16 | 重庆大学 | High-precision harmonic analysis method of sampling data synchronization |
| CN103197129A (en) * | 2013-04-10 | 2013-07-10 | 安徽节源节能科技有限公司 | Electric power signal zero crossing point detection method |
| JP2014055797A (en) * | 2012-09-11 | 2014-03-27 | Kansai Electric Power Co Inc:The | Measuring device and method, as well as analyzing device and method |
| GB201418975D0 (en) * | 2014-10-24 | 2014-12-10 | Hydronix Ltd | Determining a resonant frequency of a sensing element |
| CN104201720A (en) * | 2014-09-12 | 2014-12-10 | 阳光电源股份有限公司 | Control method and control device for suppression of resonance of grid-connected power generation system |
| WO2015062950A1 (en) * | 2013-10-30 | 2015-05-07 | Koninklijke Philips N.V. | Prediction of zero-crossing for a load current of a resonant converter |
| CN106018958A (en) * | 2016-05-11 | 2016-10-12 | 西安西热节能技术有限公司 | Current voltage frequency tracking method of secondary side in isolated grid frequency conversion system |
| CN107632187A (en) * | 2016-07-19 | 2018-01-26 | 英飞凌科技奥地利有限公司 | Current sense and zero passage detection in Semi-resonance electric pressure converter |
| CN108183654A (en) * | 2018-01-15 | 2018-06-19 | 上海艾为电子技术股份有限公司 | The calibration method and device of linear vibrator resonant frequency |
| CN108427031A (en) * | 2018-05-02 | 2018-08-21 | 三峡大学 | Harmonic detection method based on fitting of a polynomial and non-interference region division |
| CN109683063A (en) * | 2019-02-22 | 2019-04-26 | 中国石油大学(华东) | A kind of single-phase grounded malfunction in grounded system of low current direction detection method using zero-sequence current and voltage derivative linearity relationship |
-
2019
- 2019-06-18 CN CN201910528159.3A patent/CN110361596A/en active Pending
Patent Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1139711A (en) * | 1966-11-30 | 1969-01-15 | Standard Telephones Cables Ltd | Apparatus for analysing complex waveforms |
| US4441368A (en) * | 1982-04-19 | 1984-04-10 | General Electric Company | Method and means for determining ultrasonic wave attenuation in tissue |
| CN1571613A (en) * | 2003-03-07 | 2005-01-26 | 电灯专利信托有限公司 | Method and apparatus for determining the resonant frequency of a resonant circuit |
| CN1573107A (en) * | 2003-05-26 | 2005-02-02 | Lg电子株式会社 | Apparatus and method for controlling operation of a reciprocating compressor |
| CN101025155A (en) * | 2006-02-07 | 2007-08-29 | 通用电气公司 | Systems and methods for detecting suction valve closure |
| US20100064809A1 (en) * | 2008-09-13 | 2010-03-18 | Kenji Toga | System and Method to Determine Mechanical Resonance of an Accelerometer |
| US20100250169A1 (en) * | 2009-03-24 | 2010-09-30 | Boeing Company, A Corporation Of The State Of Delaware | Method and apparatus for evaluating data representing a plurality of excitations of a plurality of sensors |
| CN101806832A (en) * | 2010-04-15 | 2010-08-18 | 南京邮电大学 | Measuring method for frequencies of low-frequency signals |
| CN102243272A (en) * | 2011-04-01 | 2011-11-16 | 重庆大学 | High-precision harmonic analysis method of sampling data synchronization |
| JP2014055797A (en) * | 2012-09-11 | 2014-03-27 | Kansai Electric Power Co Inc:The | Measuring device and method, as well as analyzing device and method |
| CN103197129A (en) * | 2013-04-10 | 2013-07-10 | 安徽节源节能科技有限公司 | Electric power signal zero crossing point detection method |
| WO2015062950A1 (en) * | 2013-10-30 | 2015-05-07 | Koninklijke Philips N.V. | Prediction of zero-crossing for a load current of a resonant converter |
| CN104201720A (en) * | 2014-09-12 | 2014-12-10 | 阳光电源股份有限公司 | Control method and control device for suppression of resonance of grid-connected power generation system |
| GB201418975D0 (en) * | 2014-10-24 | 2014-12-10 | Hydronix Ltd | Determining a resonant frequency of a sensing element |
| CN106018958A (en) * | 2016-05-11 | 2016-10-12 | 西安西热节能技术有限公司 | Current voltage frequency tracking method of secondary side in isolated grid frequency conversion system |
| CN107632187A (en) * | 2016-07-19 | 2018-01-26 | 英飞凌科技奥地利有限公司 | Current sense and zero passage detection in Semi-resonance electric pressure converter |
| CN108183654A (en) * | 2018-01-15 | 2018-06-19 | 上海艾为电子技术股份有限公司 | The calibration method and device of linear vibrator resonant frequency |
| CN108427031A (en) * | 2018-05-02 | 2018-08-21 | 三峡大学 | Harmonic detection method based on fitting of a polynomial and non-interference region division |
| CN109683063A (en) * | 2019-02-22 | 2019-04-26 | 中国石油大学(华东) | A kind of single-phase grounded malfunction in grounded system of low current direction detection method using zero-sequence current and voltage derivative linearity relationship |
Non-Patent Citations (3)
| Title |
|---|
| C. J. G. BAKKER等: "Calculation of Zero-Crossing and Spin-Lattice Relaxation Time Pictures in Inversion Recovery NMR Imaging", 《IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING》, vol. 32, no. 7 * |
| 杨志远等: "一种纵向共振光声池谐振频率测量方法", 《激光技术》, vol. 43, no. 3 * |
| 陈颖: "电除尘高频电源谐振电流过零信号的检测设计", 《电气自动化》, vol. 33, no. 5 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600487A (en) * | 2020-03-14 | 2020-08-28 | 青岛鼎信通讯股份有限公司 | Control strategy for improving DCDC efficiency of charging station energy router system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Vainio et al. | Noise reduction in zero crossing detection by predictive digital filtering | |
| Elrayyah et al. | Robust phase locked‐loop algorithm for single‐phase utility‐interactive inverters | |
| Moschitta et al. | Performance comparison of advanced techniques for voltage dip detection | |
| Drayer et al. | Detection of false data injection attacks in power systems with graph fourier transform | |
| Dash et al. | Dynamic phasor and frequency estimation of time-varying power system signals | |
| CN105790568B (en) | High frequency resonant soft-switching circuit failure prediction method and device based on compressed sensing | |
| CN108020721A (en) | A kind of frequency estimating methods of the non-equilibrium electric system based on IpDFT | |
| CN110361596A (en) | A kind of Resonance detector strategy based on zero-crossing examination | |
| CN111458640B (en) | Three-phase current-based alternating current asynchronous motor rotor broken bar fault diagnosis method | |
| Fujisawa et al. | Intermittent characteristics in coupling between turbulence and zonal flows | |
| KR101648068B1 (en) | Apparatus and method for detecting phase and harmonic using fast fourier transform | |
| Yang et al. | Oscillation mode analysis for power grids using adaptive local iterative filter decomposition | |
| Rahmati et al. | Real-time electrical variables estimation based on recursive wavelet transform | |
| CN108809272A (en) | Multinomial kalman filter method and filter | |
| Djurovic | Estimation of the sinusoidal signal frequency based on the marginal median DFT | |
| CN105610408B (en) | A kind of Nonlinear Volterra filtering optimization method based on contribution factor | |
| CN105510653B (en) | A kind of orthogonal signal generator system based on adaptive least mean square algorithm | |
| CN107576842B (en) | Broadband synchronous sampling method | |
| Akbaryan et al. | Smooth representation of trends by a wavelet-based technique | |
| Benitez et al. | A state estimation strategy for a nonlinear switched system with unknown switching signals | |
| Liu et al. | An enhanced adaptive notch filtering method for online multi-frequency estimation from contaminated signals of a mechanical control system | |
| Zhongqun et al. | A modified Cao method with delay embedded | |
| Wang et al. | Incipient fault feature extraction of rolling element bearings based on SOSO boosting technique and improved energy operator | |
| CN109782074B (en) | Low-frequency sine wave fast response full-parameter estimation method and device | |
| CN108880505A (en) | Grounded screen potential difference filtering method based on starting decision element and wavelet transformation |
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 |