CN109683030A - A kind of terminal phase sequence automatic identifying method - Google Patents
A kind of terminal phase sequence automatic identifying method Download PDFInfo
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- CN109683030A CN109683030A CN201910018241.1A CN201910018241A CN109683030A CN 109683030 A CN109683030 A CN 109683030A CN 201910018241 A CN201910018241 A CN 201910018241A CN 109683030 A CN109683030 A CN 109683030A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
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- Measuring Frequencies, Analyzing Spectra (AREA)
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Abstract
The invention discloses a kind of terminal phase sequence automatic identifying methods, comprising the following steps: basic electric parameter voltage value u and current value i when acquisition terminal steady operation；Step 2: frequency domain decomposition being carried out to the voltage and current signals of acquisition, obtains the fundamental wave amplitude-frequency characteristic of voltage and current；Step 3: voltage and current waveform corresponds to the phase angle at moment in analysis fundamental wave, judges whether voltage and current is the same phase sequence.The present invention need to can only judge the three-phase of Current Voltage by phase angle difference, have many advantages, such as simple, economic, application easy to spread.
Description
Technical field
The invention belongs to electrical engineering field, specially a kind of terminal phase sequence automatic identifying method.
Background technique
The electrical equipments such as Electric Actuator, excavator, threephase motor need and power supply because of maintenance or job site transfer
It is inevitably that phase sequence is reversed when re-connecting, make its cisco unity malfunction；It, can for the equipment for only allowing single direction rotation
It can cause the damage of its rotary device；Man lift makes traffic direction and predetermined direction on the contrary, may jeopardize because of the change of phase sequence
Life safety.And the circuit of testing the phase sequence of early stage is made of capacitor, resistance, although structure is simple, capacitance is larger, needs to refer to
Show the instruction of lamp, power consumption is big, and volume is also big, it is also necessary to it manually goes to differentiate the brightness of lamp, and can not achieve automatic detection, it is existing
Phase sequence detecting method some uses Digital Logical Circuits or single-chip microcontroller, and circuit is complex.In life and work, need using three
Mutually there are many equipment of electricity, and resident is populous at present, and power load also becomes larger increasingly, for being used in detection resident's electric appliance
The quantity of the terminal of identification also gradually increases, however terminal is being installed, power-off restarting, requires to carry out phase sequence when short circuit
Judgement, therefore, establishing terminal three-phase electricity automatic identification becomes a kind of urgent demand.
Non- formula intelligent terminal of registering one's residence is a kind of identification terminal for recognizing resident's electric appliance, has intelligence, minimizes, is low
The technical characterstics such as power consumption, one-to-many, self study, online upgrading can serve the fine granularity power information acquisition of Utilities Electric Co.,
Carry out the advanced supply and demand interactive services such as the energy visible diagnosis to resident, demand side management on this basis.This terminal
It is small in size, it is low in energy consumption, it is mounted on forceful electric power well, near internal Utilities Electric Co.'s ammeter box, without entering the room construction, is not necessarily to user
Electric appliance nameplate parameter is provided；Separate unit terminal maximum supports the fine granularity electricity consumption behavior identification of 12 family residents, timing to upload 15 minutes
Granularity<appliance type, the start-stop time, power consumption>identification result sequence；Match 2G/3G/4G syntype wireless communication mode
Or narrowband/broadband power line carrier communication mode；It is high to recognize electric appliance A wide selection of colours and designs, identification precision, identification electric appliance type includes fixed
Frequency air-conditioning, convertible frequency air-conditioner, micro-wave oven, electric cooker, kitchen appliance, electric heating, other electric heating etc. mainly interact electric appliance, supported feature
The online upgrading in library and identification algorithm.
It there is no document to propose a kind of accurate and effective, fast terminal phase sequence automatic identification method at present, more adopted without basis
The voltage and current signals of collection carry out frequency domain decomposition, obtain the fundamental wave amplitude-frequency characteristic of voltage and current, analyze in fundamental wave voltage and
Current waveform corresponds to the phase angle at moment, if voltage and current corresponds to the fundamental wave phase angle difference absolute value at moment less than 0.05 (radian)
It is judged as same phase sequence, it is on the contrary then be not same phase sequence.The present invention provides a kind of effective for the phase sequence automatic identification of terminal
Judgment method, the method do not need the phase sequence that three-phase electricity can be quickly recognized using any phase sequence identifier, have simple, warp
The advantages that Ji, application easy to spread.This method facilitates identification terminal and judges whether three-phase electricity certain open circuit, the feelings such as phase shortage occurs
Condition, and corresponding auxiliary judgment can be made to its fault diagnosis.
Summary of the invention
To solve the deficiencies in the prior art, the present invention proposes a kind of terminal phase sequence automatic identifying method, thus accurate and effective
Rapidly A, B, C three-phase electricity of automatic identification voltage and current.
To reach above-mentioned purpose, the technical solution adopted in the present invention is as follows:
A kind of terminal phase sequence automatic identifying method, comprising the following steps:
Step 1: basic electric parameter voltage value u and current value i when acquisition terminal steady operation；
Step 2: frequency domain decomposition being carried out to the voltage and current signals of acquisition, the fundamental wave amplitude-frequency for obtaining voltage and current is special
Property；
Step 3: voltage and current waveform corresponds to the phase angle at moment in analysis fundamental wave, judges whether voltage and current is same
A phase sequence.
Further, the basic electric parameter voltage value u and current value i when the step 1 acquisition terminal steady operation,
Specifically:
The voltage and current value under acquisition terminal steady-working state is distinguished with potential and current transformers, wherein voltage u
With electric current i be through filtering and denoising after voltage signal sample sequence, setting sample frequency be 500Hz~2kHz it
Between.
Further, the step 2: frequency domain decomposition is carried out to the voltage and current signals of acquisition, obtains voltage and electricity
The fundamental wave amplitude-frequency characteristic of stream, specifically:
The frequency-domain analysis method for selecting discrete fourier transform fast algorithm, by discrete fourier transform fast algorithm to voltage
Frequency domain decomposition is carried out with current signal, obtains the fundamental wave amplitude-frequency characteristic of voltage and current；
Formula are as follows:
(V,θV)=FFT (U (i)) (i=1,2 ..., N)
(I,θI)=FFT (I (i)) (i=1,2 ..., N)
In above formula, (V, θV) it is that quick Fourier transformation is carried out to voltage using discrete fourier transform fast algorithm function
The voltage magnitude under different frequency afterwards, sequence of phase angles, U (i) are the contact potential series of acquisition, and N is that discrete fourier transform is calculated quickly fastly
Sampling number used in method；
(I,θI)=FFT (I (i)) (i=1,2 ..., N)
In above formula, (I, θI) it is that quick Fourier transformation is carried out to electric current using discrete fourier transform fast algorithm function
The current amplitude under different frequency afterwards, sequence of phase angles, I (i) are the current sequence of acquisition, and N is that discrete fourier transform is calculated quickly fastly
Sampling number used in method；
Show that voltage, the amplitude-frequency of electric current are special by the discrete Fourier transform of amplitude, sequence of phase angles to voltage and current
Property, complete frequency-domain analysis.
Further, voltage and current waveform correspond to the phase angle at moment in the step 3 analysis fundamental wave, judge voltage with
Whether electric current is the same phase sequence, specifically: if voltage and current corresponds to the fundamental wave phase angle difference absolute value at moment less than 0.05 arc
On the contrary degree, then be judged as same phase sequence, then be not same phase sequence；
θV base=θV(f=50Hz)
θ I base=θ I (f=50Hz)
if(|θV base-θI base|<0.05)
Judge: voltage and current belongs to the same phase sequence；
In above formula, θV baseVoltage fundamental phase angle under being 50Hz for frequency, θI baseElectric current base under being 50Hz for frequency
Wave phase angle.
Compared with prior art, the invention has the benefit that
A kind of terminal phase sequence automatic identifying method of the invention need to can only judge the A of Current Voltage by phase angle difference,
B, C three-phase have many advantages, such as simple, economic, application easy to spread.This method facilitates identification terminal and judges whether three-phase electricity goes out
Situations such as certain existing open circuit, phase shortage, and corresponding auxiliary judgment can be made to its fault diagnosis.
Detailed description of the invention
Fig. 1 is overview flow chart of the invention；
Fig. 2 is the waveform diagram of three-phase voltage and electric current that the present invention acquires.
In figure: Fig. 2 (a) is the three-phase voltage waveform diagram of acquisition；Fig. 2 (b) is the three-phase electricity waveform diagram of acquisition.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
A kind of terminal phase sequence automatic identifying method, comprising the following steps:
Step 1: basic electric parameter voltage value u and current value i when acquisition terminal steady operation；It is mutual with voltage and current
Sensor distinguishes the voltage and current value under acquisition terminal steady-working state, and wherein voltage u and electric current i is by filtering and denoising
Sample frequency is arranged between 500Hz~2kHz in the sample sequence of treated voltage signal
Step 2: frequency domain decomposition being carried out to the voltage and current signals of acquisition, the fundamental wave amplitude-frequency for obtaining voltage and current is special
Property；
The frequency-domain analysis method for selecting discrete fourier transform fast algorithm, by discrete fourier transform fast algorithm to voltage
Frequency domain decomposition is carried out with current signal, obtains the fundamental wave amplitude-frequency characteristic of voltage and current；
Formula are as follows:
(V,θV)=FFT (U (i)) (i=1,2 ..., N)
(I,θI)=FFT (I (i)) (i=1,2 ..., N)
In above formula, (V, θV) it is that quick Fourier transformation is carried out to voltage using discrete fourier transform fast algorithm function
The voltage magnitude under different frequency afterwards, sequence of phase angles, U (i) are the contact potential series of acquisition, and N is that discrete fourier transform is calculated quickly fastly
Sampling number used in method；
(I,θI)=FFT (I (i)) (i=1,2 ..., N)
In above formula, (I, θI) it is that quick Fourier transformation is carried out to electric current using discrete fourier transform fast algorithm function
The current amplitude under different frequency afterwards, sequence of phase angles, I (i) are the current sequence of acquisition, and N is that discrete fourier transform is calculated quickly fastly
Sampling number used in method；
Show that voltage, the amplitude-frequency of electric current are special by the discrete Fourier transform of amplitude, sequence of phase angles to voltage and current
Property, complete frequency-domain analysis
Step 3: voltage and current waveform corresponds to the phase angle at moment in analysis fundamental wave, judges whether voltage and current is same
A phase sequence；If voltage and current corresponds to the fundamental wave phase angle difference absolute value at moment less than 0.05 radian, it is judged as same phase sequence, instead
Then not be same phase sequence；
θV base=θV(f=50Hz)
θ I base=θ I (f=50Hz)
if(|θV base-θI base|<0.05)
Judge: voltage and current belongs to the same phase sequence；
In above formula, θV baseVoltage fundamental phase angle under being 50Hz for frequency, θI baseElectric current base under being 50Hz for frequency
Wave phase angle.
According to the spoke frequency characteristic under different frequency obtained in step 2, UA, IA, IB, IC under 50Hz fundamental wave are calculated
Corresponding phase angle is as follows:
θ V base (UA1)=2.1989 (radian)=126.0516 °
θ I base (IA1)=2.2113 (radian)=126.7624 °
θ I base (IB1)=0.1203 (radian)=6.8962 °
θ I base (IC1)=- 1.982 (radian)=- 113.6178 °
According to formula if (| θ V base- θ I base | < 0.05), the poor absolute value of each fundamental wave phase angle is calculated, can be obtained:
By UA, IA fundamental wave phase angle makes the difference absolute value, available | 2.2113-2.1989 |=0.0124 < 0.05 can determine whether
For same phase；
By UA, IB fundamental wave phase angle makes the difference absolute value, available | 2.1989-0.1203 |=2.0786 > 0.05 can determine whether
It is not same phase；
By UA, IC fundamental wave phase angle makes the difference absolute value, available | 2.1989-0.1203 |=2.0786 > 0.05 can determine whether
It is not same phase.
Although the present invention has been disclosed as a preferred embodiment, however, it is not to limit the invention.Skill belonging to the present invention
Has usually intellectual in art field, without departing from the spirit and scope of the present invention, when can be used for a variety of modifications and variations.Cause
This, the scope of protection of the present invention is defined by those of the claims.
Claims (4)
1. a kind of terminal phase sequence automatic identifying method, which comprises the following steps:
Step 1: basic electric parameter voltage value u and current value i when acquisition terminal steady operation；
Step 2: frequency domain decomposition being carried out to the voltage and current signals of acquisition, obtains the fundamental wave amplitude-frequency characteristic of voltage and current；
Step 3: voltage and current waveform corresponds to the phase angle at moment in analysis fundamental wave, judges whether voltage and current is the same phase
Sequence.
2. a kind of terminal phase sequence automatic identifying method according to claim 1, which is characterized in that the step 1 acquires end
The basic electric parameter voltage value u and current value i when steady operation are held, specifically:
The voltage and current value under acquisition terminal steady-working state is distinguished with potential and current transformers, wherein voltage u and electricity
Flowing i is that sample frequency is arranged between 500Hz~2kHz by filtering the sample sequence with the voltage signal after denoising.
3. a kind of terminal phase sequence automatic identifying method according to claim 1, which is characterized in that the step 2: to acquisition
Voltage and current signals carry out frequency domain decomposition, obtain the fundamental wave amplitude-frequency characteristic of voltage and current, specifically:
The frequency-domain analysis method for selecting discrete fourier transform fast algorithm, by discrete fourier transform fast algorithm to voltage and electricity
It flows signal and carries out frequency domain decomposition, obtain the fundamental wave amplitude-frequency characteristic of voltage and current；
Formula are as follows:
(V,θV)=FFT (U (i)) (i=1,2 ..., N)
(I,θI)=FFT (I (i)) (i=1,2 ..., N)
In above formula, (V, θV) be using discrete fourier transform fast algorithm function to voltage carry out quick Fourier transformation after not
Voltage magnitude, sequence of phase angles under same frequency, U (i) are the contact potential series of acquisition, and N is used in discrete fourier transform fast algorithm
Sampling number；
(I,θI)=FFT (I (i)) (i=1,2 ..., N)
In above formula, (I, θI) be using discrete fourier transform fast algorithm function to electric current carry out quick Fourier transformation after not
Current amplitude, sequence of phase angles under same frequency, I (i) are the current sequence of acquisition, and N is used in discrete fourier transform fast algorithm
Sampling number；
The amplitude-frequency characteristic of voltage, electric current is obtained by the discrete Fourier transform of amplitude, sequence of phase angles to voltage and current, it is complete
At frequency-domain analysis.
4. a kind of terminal phase sequence automatic identifying method according to claim 1, which is characterized in that the step 3 analyzes base
Voltage and current waveform corresponds to the phase angle at moment in wave, judges whether voltage and current is the same phase sequence, specifically: if voltage
The fundamental wave phase angle difference absolute value at moment is corresponded to electric current less than 0.05 radian, then is judged as same phase sequence, it is on the contrary then be not same
Phase sequence；
θVbase=θV(f=50Hz)
θ I base=θ I (f=50Hz)
if(|θV base-θI base|<0.05)
Judge: voltage and current belongs to the same phase sequence；
In above formula, θVbaseVoltage fundamental phase angle under being 50Hz for frequency, θIbaseCurrent first harmonics phase angle under being 50Hz for frequency.
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|---|---|---|---|
| CN201910018241.1A CN109683030A (en) | 2019-01-09 | 2019-01-09 | A kind of terminal phase sequence automatic identifying method |
| PCT/CN2019/129710 WO2020143492A1 (en) | 2019-01-09 | 2019-12-30 | Terminal phase sequence automatic identification method |
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|---|---|---|---|
| CN201910018241.1A CN109683030A (en) | 2019-01-09 | 2019-01-09 | A kind of terminal phase sequence automatic identifying method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609165A (en) * | 2019-09-19 | 2019-12-24 | 国网天津市电力公司电力科学研究院 | Method for automatically detecting wiring errors and correcting data of online power quality monitoring device |
| CN110798174A (en) * | 2019-11-15 | 2020-02-14 | 北京普源精电科技有限公司 | Signal triggering method and system |
| WO2020143492A1 (en) * | 2019-01-09 | 2020-07-16 | 江苏智臻能源科技有限公司 | Terminal phase sequence automatic identification method |
| CN111707881A (en) * | 2020-07-10 | 2020-09-25 | 陕西航空电气有限责任公司 | Three-phase alternating current power supply sequence identification method and device |
| CN112798878A (en) * | 2021-02-25 | 2021-05-14 | 山东科汇电力自动化股份有限公司 | Line transposition automatic phase sequence identification method based on voltage synchronous comparison |
| CN113866628A (en) * | 2021-11-19 | 2021-12-31 | 国网辽宁省电力有限公司鞍山供电公司 | Switch state analysis method based on current and voltage two-phase sequence comparison |
| CN117200333A (en) * | 2023-11-08 | 2023-12-08 | 深圳鹏城新能科技有限公司 | Phase sequence processing method and device based on single-phase inverter and electronic equipment |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020143492A1 (en) * | 2019-01-09 | 2020-07-16 | 江苏智臻能源科技有限公司 | Terminal phase sequence automatic identification method |
| CN110609165A (en) * | 2019-09-19 | 2019-12-24 | 国网天津市电力公司电力科学研究院 | Method for automatically detecting wiring errors and correcting data of online power quality monitoring device |
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| CN110798174A (en) * | 2019-11-15 | 2020-02-14 | 北京普源精电科技有限公司 | Signal triggering method and system |
| CN110798174B (en) * | 2019-11-15 | 2023-08-22 | 北京普源精电科技有限公司 | Signal triggering method and system |
| CN111707881A (en) * | 2020-07-10 | 2020-09-25 | 陕西航空电气有限责任公司 | Three-phase alternating current power supply sequence identification method and device |
| CN111707881B (en) * | 2020-07-10 | 2022-08-19 | 陕西航空电气有限责任公司 | Three-phase alternating current power supply sequence identification method and device |
| CN112798878A (en) * | 2021-02-25 | 2021-05-14 | 山东科汇电力自动化股份有限公司 | Line transposition automatic phase sequence identification method based on voltage synchronous comparison |
| CN113866628A (en) * | 2021-11-19 | 2021-12-31 | 国网辽宁省电力有限公司鞍山供电公司 | Switch state analysis method based on current and voltage two-phase sequence comparison |
| CN113866628B (en) * | 2021-11-19 | 2023-12-19 | 国网辽宁省电力有限公司鞍山供电公司 | Switch state analysis method based on current and voltage double-phase sequence comparison |
| CN117200333A (en) * | 2023-11-08 | 2023-12-08 | 深圳鹏城新能科技有限公司 | Phase sequence processing method and device based on single-phase inverter and electronic equipment |
| CN117200333B (en) * | 2023-11-08 | 2024-03-08 | 深圳鹏城新能科技有限公司 | Phase sequence processing method and device based on single-phase inverter and electronic equipment |
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| WO2020143492A1 (en) | 2020-07-16 |
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Application publication date: 20190426 |