CN110045252A - A kind of series direct current arc method for measuring integrated using spectrum energy - Google Patents

A kind of series direct current arc method for measuring integrated using spectrum energy Download PDF

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Publication number
CN110045252A
CN110045252A CN201910371739.6A CN201910371739A CN110045252A CN 110045252 A CN110045252 A CN 110045252A CN 201910371739 A CN201910371739 A CN 201910371739A CN 110045252 A CN110045252 A CN 110045252A
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direct current
series
energy
frequency band
loop current
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CN110045252B (en
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祝令瑜
刘小军
庄哲
汲胜昌
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Xian Jiaotong University
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Xian Jiaotong University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing

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  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

The invention discloses a kind of series direct current arc method for measuring integrated using spectrum energy, in direct current system, measure loop current, are subject to bandpass filtering, free transmission range 1-100kHz to the loop current measured.And Fast Fourier Transform (FFT) (FFT) is done in certain time window to loop current after bandpass filtering, obtain the frequency spectrum of loop current.The quadratic sum that loop current frequency domain amplitude is carried out in series arc faults special frequency band (1-100kHz) range calculates, as calculating failure special frequency band range self-energy integrated value.When series arc faults occur in direct current system, the special frequency band range self-energy integrated value will appear increase before and after failure.If increasing and more than threshold value occurs in failure special frequency band range self-energy integrated value, then it is assumed that series direct current arc fault occurs.

Description

A kind of series direct current arc method for measuring integrated using spectrum energy
Technical field
The invention belongs to electrical engineering fields, are related to a kind of series direct current method for detecting arc.
Background technique
With the further development of modern industry, direct current system is widely used in such as aerospace, electric car neck Domain.In direct current system, because of the reasons such as joint looseness and cable aging, it may appear that series direct current arc fault.Due to direct current Flow no zero crossing, it, will not natural blow-out after series direct current arc fault generates, it is easier to cause the danger such as fire.
When series direct current arc fault generates in direct current system, it is equivalent to one nonlinear resistance of series connection in systems, Meeting is so that DC current amplitude reduces in system, and has high fdrequency component generation with series direct current arc fault.Series direct current The mode that predominantly detects of arc fault is to change indirect detection mode by the time domain variation of measure loop electric current and frequency domain amplitude. Loop current, and then the frequency domain in analysis circuit electric current are measured using current probe, extracts fault characteristic band, with feature frequency The variation of specific frequency amplitude carrys out the generation of characterization failure in band.T.Taufik et al. is to 80V and following voltage levels direct current system The detection method of the series, parallel type arc fault generated in system is studied, and is proposed a kind of based on 24.4- in electric current The direct-current arc detection method that frequency domain amplitude changes in 100kHz frequency range, and direct current arc fault has been made according to this method Detection device.
But since electromagnetic interference is more serious in actual environment, and normal switch movement and load switching in electrical system Equal normal operatings can also to generate high-frequency signal in electric loop, therefore be based only upon series direct current arc fault feature band Frequency domain amplitude is smaller come the method discrimination for detecting series direct current arc fault, needs to propose a kind of new to have bigger discrimination Detection method.
Summary of the invention
In view of this, the present invention is directed to invent a kind of series direct current arc method for measuring integrated using spectrum energy.Benefit It is integrated with spectrum energy, the characteristic signal discrimination of series direct current arc fault and normal operating in electrical system can be improved, The effectively generation of detection series direct current arc fault.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of series direct current arc method for measuring integrated using spectrum energy, comprising the following steps:
1) in direct current system, DC output side loop current is measured, the loop current measured is subject to bandpass filtering；
2) Fast Fourier Transform (FFT) FFT is done in 1-20ms time window to loop current after bandpass filtering, obtains circuit electricity The frequency spectrum of stream；
3) the quadratic sum meter of loop current frequency domain amplitude is carried out within the scope of series arc faults special frequency band 1-100kHz It calculates, as calculating failure special frequency band range self-energy integrated value, when series arc faults occur in direct current system, before failure The special frequency band range self-energy integrated value will appear increase afterwards, if failure special frequency band range self-energy integrated value increases It and is more than threshold value, then it is assumed that series direct current arc fault occurs.
The loop current that measures needs to carry out bandpass filtering, free transmission range 1-100kHz.
The detection energy product score value is the quadratic sum of 1-100kHz frequency range inner looping current frequency domain amplitude.
The detection criteria is, when increasing occurs in 1-100kHz frequency range self-energy integrated value and is more than threshold value, then Think that series direct current arc fault occurs.
The beneficial effects of the present invention are:
1. the principle detection series direct current arc fault using spectrum energy integral generates, principle is simple and easy, by right Fault characteristic band carries out energy integral in current spectrum, then is compared with preset threshold value；
2. detection discrimination can be improved using spectrum energy integral, the dry of normal operating and environmental factor in system is avoided It disturbs, prevents from causing to judge by accident, fail to judge.
Detailed description of the invention
Fig. 1 is the flow chart of the invention using spectrum energy integrated detected direct current arc fault；
Fig. 2 is that series direct current arc fault generates front and back spectrogram；
Fig. 3 is that series direct current arc fault generates front and back spectrum energy integral with frequency variation diagram in the present invention；
Fig. 4 is that series direct current arc fault generation front and back spectrum energy integral changes over time figure in the present invention.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in detail.
The series direct current arc method for measuring of the present invention integrated using spectrum energy, in direct current system, measurement Loop current is subject to bandpass filtering, free transmission range 1-100kHz to the loop current measured.And to circuit electricity after bandpass filtering Stream does Fast Fourier Transform (FFT) (FFT) in certain time window, obtains the frequency spectrum of loop current.In the specific frequency of series arc faults The quadratic sum that loop current frequency domain amplitude is carried out in band (1-100kHz) range calculates, as within the scope of calculating failure special frequency band Energy product score value.When series arc faults occur in direct current system, the special frequency band range self-energy integrated value before and after failure It will appear increase.If increasing and more than threshold value occurs in failure special frequency band range self-energy integrated value, then it is assumed that series direct current electricity Arc failure occurs.
Frequency-domain spectrum analysis is carried out to arc current according to early period, it can be found that the feature band of arc current is mainly 1- 100kHz, therefore select 1-100kHz frequency range for detection range；
As shown in Figure 1, using the series direct current arc fault detection process that spectrum energy integrates the following steps can be divided into:
1) DC output side loop current is detected using current probe；
2) it is subject to bandpass filtering, free transmission range 1-100kHz to measuring loop current；
3) to time window tNLoop current carries out FFT after interior filtering；
As shown in Fig. 2, loop current amplitude in 1-100kHz frequency range increases after series direct current arc fault generates Add.
4) t is calculatedNThe interior frequency domain amplitude quadratic sum S of inner looping current characteristic frequency band (1-100kHz)N(as energy integral)；
As shown in figure 3, frequency domain amplitude quadratic sum is long-range in loop current feature band after series direct current arc fault generates The frequency domain amplitude quadratic sum before arc fault generates, differentiation interval range is larger, can effectively avoid the influence of disturbing factor.
If 5) SNGreater than SN-1And SNGreater than threshold value St, then show that series arc faults have occurred in circuit.Wherein threshold value StIt is selected according to the data detected in practical electric loop, and related with specific electric loop.
In the present embodiment, select DC power supply for 48V lithium battery, DC load is 12.5 Ω resistance, is generated using electric arc Device generates series direct current electric arc；
In the present embodiment, data acquisition uses the TCPA300 model current probe of Imtech, and current probe bandwidth is DC-100MHz, oscillograph sample frequency f=200MHz, sampling time 100ms, sampling number 20M；
In the present embodiment, lithium battery anode outlet side electric current is detected using current probe；
In the present embodiment, the manual operation voltaic arc generating device in 10ms makes to generate series direct current electric arc in DC loop Failure；
In the present embodiment, bandpass filtering free transmission range is 1-100kHz；
In the present embodiment, time window is selected as 5ms, and 1-100kHz frequency range inner looping electric current frequency is calculated since 0ms Domain squared magnitude and；
As shown in figure 4, value of the loop current 1-100kHz energy integral at 15ms occurs compared to the value at 10ms It significantly increases, then it is assumed that series direct current arc fault occurs during 10-15ms.

Claims (4)

1. a kind of series direct current arc method for measuring integrated using spectrum energy, which comprises the following steps:
1) in direct current system, DC output side loop current is measured, the loop current measured is subject to bandpass filtering；
2) Fast Fourier Transform (FFT) FFT is done in 1-20ms time window to loop current after bandpass filtering, obtains loop current Frequency spectrum；
3) quadratic sum that loop current frequency domain amplitude is carried out within the scope of series arc faults special frequency band 1-100kHz calculates, i.e., It, should before and after failure when series arc faults occur in direct current system to calculate failure special frequency band range self-energy integrated value Special frequency band range self-energy integrated value will appear increase, if failure special frequency band range self-energy integrated value occurs increasing and surpass Cross threshold value, then it is assumed that series direct current arc fault occurs.
2. a kind of series direct current arc method for measuring integrated using spectrum energy according to claim 1, feature are existed In the loop current that measures needs to carry out bandpass filtering, free transmission range 1-100kHz.
3. a kind of series direct current arc method for measuring integrated using spectrum energy according to claim 1, feature are existed In the detection energy product score value is the quadratic sum of 1-100kHz frequency range inner looping current frequency domain amplitude.
4. a kind of series direct current arc method for measuring integrated using spectrum energy according to claim 1, feature are existed In the detection criteria is, when increasing and more than threshold value occurs in 1-100kHz frequency range self-energy integrated value, then it is assumed that string Join direct current arc fault.
CN201910371739.6A 2019-05-06 2019-05-06 Series direct current arc detection method utilizing frequency spectrum energy integration Active CN110045252B (en)

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CN111983402A (en) * 2020-08-20 2020-11-24 阳光电源股份有限公司 Direct-current arc fault detection method and photovoltaic inversion system
CN112067961A (en) * 2020-10-13 2020-12-11 哈尔滨工业大学（深圳） Arc fault detection method, system and storage medium
CN112363021A (en) * 2020-11-13 2021-02-12 重庆大学 Distributed line fault detection and positioning system and method
CN114252669A (en) * 2021-12-22 2022-03-29 江苏格澜得智能电气有限公司 Device for generating series arc harmonic signals

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CN112363021A (en) * 2020-11-13 2021-02-12 重庆大学 Distributed line fault detection and positioning system and method
CN114252669A (en) * 2021-12-22 2022-03-29 江苏格澜得智能电气有限公司 Device for generating series arc harmonic signals
CN114252669B (en) * 2021-12-22 2024-04-26 江苏格澜得智能电气有限公司 Device for generating series arc harmonic signals

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