CN110441662A - The detection method and device of DC power-supply system and its arc fault - Google Patents
The detection method and device of DC power-supply system and its arc fault Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention provides the detection method and device of a kind of DC power-supply system and its arc fault, and described detection method includes the following steps: obtaining the line current signal and power supply voltage signal of DC power-supply system；Judged whether that electric current bust occurs according to line current signal；In case of electric current bust, then line current rate of descent is calculated according to line current signal, and judge whether line current rate of descent is within pre-set interval；If line current rate of descent is within pre-set interval, the electric current variance after line current declines and before decline is then calculated according to line current signal, and the mains voltage ripple variance after line current decline and before decline is calculated according to power supply voltage signal, and electric current variance after declining according to line current and before decline and mains voltage ripple variance judge whether that arc event occurs；If the number that arc event persistently occurs is greater than preset times threshold value, determine that arc fault occurs for DC power-supply system.
Description
Technical field
The present invention relates to electric fault detection technique fields, and in particular to the inspection of arc fault in a kind of DC power-supply system
The detection device of arc fault and a kind of DC power-supply system in survey method, a kind of DC power-supply system.
Background technique
With the fast development of the technologies such as power electronics, energy storage, currently, direct current supply is in space flight and aviation, data center, electricity
It is widely used in the fields such as electrical automobile, photovoltaic power generation.The actual load of a large amount of civil electrical equipment is also all straight
Stream power supply, such as LED bulb, TV, printer, frequency control air-conditioning, washing machine, refrigerator.Since direct current supply has route
At low cost, the advantages that transmission losses is small, power supply reliability is high, it is completed multiple direct current adapted electricity demonstration projects both at home and abroad, China
Also standard " GB/T 35727-2017 mesolow DC distribution voltage directive/guide " has been promulgated, to push answering extensively for direct current supply
With.It is therefore contemplated that the application of direct current supply will be more and more.In DC power-supply system, due to aging circuit, connection
Loosen, etc. fault electric arc caused by reasons happen occasionally, and DC Line Fault electric arc is an important factor for inducing electrical fire.Cause
This, the detection of researching DC fault electric arc and protection technique have great importance for the safety for improving direct current supply, and have
Wide application prospect has become one of hot research direction of electrical engineering field at present.
Relative to alternating current arc, people start late to the research of the detection technique of DC Line Fault electric arc.With AC fault
Electric arc is compared, and when occurring arc fault in DC power-supply system, since DC power supply does not have zero crossing, electric arc is difficult to put out
It goes out, endangers bigger.
The detection mode of direct current arc fault is roughly divided into three kinds at present: first is that can be accompanied by when being occurred using arc fault
The physical features such as electromagnetic radiation, arc light and noise construct the inspection that the detection system based on physical features carries out series arc faults
It surveys.However this detection mode is influenced by the detection range of sensor, can only detect the arc fault of specific position generation.Two
It is the no regularity variation and influence of the electric arc to output voltage of line current when being occurred based on electric arc, passes through analysis circuit electric current
The detection to series arc faults is realized with the time domain or frequency domain character of output voltage.There are use occasion lists for this detection mode
One, the not high problem of accuracy.Third is that detect arc fault using the method for artificial intelligence, by wavelet transformation to voltage and
Current signal carry out feature extraction, reuse support vector machines and classify, it is determined whether occur arc fault, or by from
Arc characteristic is extracted in the time domain and frequency domain of line current to be trained hidden Markov model, is based on hidden Markov model
Carry out DC series arc-detection, and confrontation network generated based on domain adaptability and depth convolution, with solve initial data with
The problem of difference of actual conditions causes Detection accuracy to decline.These are obtained higher based on the detection mode of artificial intelligence
Accuracy rate, need a large amount of high quality samples data.
Summary of the invention
The present invention is in order to solve the above technical problems, provide the detection method of a kind of DC power-supply system and its arc fault
And device, it can in time, easily detect the arc fault in DC power-supply system, accuracy is higher, cost is relatively low and energy
Enough it is suitable for a variety of occasions.
The technical solution adopted by the invention is as follows:
The detection method of arc fault in a kind of DC power-supply system, comprising the following steps: obtain the direct current supply system
The line current signal and power supply voltage signal of system；Judged whether that electric current bust occurs according to the line current signal；If
Electric current bust occurs, then line current rate of descent is calculated according to the line current signal, and judges the line current decline
Whether rate is within pre-set interval；If the line current rate of descent is within the pre-set interval, according to
Line current signal calculates the electric current variance after the line current declines and before decline, and according to the power supply voltage signal meter
Calculate the mains voltage ripple variance after line current decline and before decline, and according to after line current decline and under
Electric current variance and mains voltage ripple variance before drop judge whether that arc event occurs；If time that arc event persistently occurs
Number is greater than preset times threshold value, then determines that arc fault occurs for the DC power-supply system.
Judged whether that electric current bust occurs according to the line current signal, specifically included: believed according to the line current
Number calculate line current mutation rate；Judged whether that electric current bust occurs according to the line current mutation rate.
First time window and the second time window are set, is calculated by the current average in the first time window
The line current mutation rate, and the line current decline is calculated by the current average in second time window
Rate, and the electric current variance is calculated by the current sampling data in second time window and passes through second time window
Mains voltage ripple sampled value in mouthful calculates the mains voltage ripple variance, wherein the first time window is less than institute
State the second time window.
Wherein, electricity is obtained in conjunction with the equivalent-circuit model of the DC power-supply system using the C-V characteristic of direct-current arc
Last transition formula is flowed, the pre-set interval is then calculated according to real-time collected supply voltage and line current.
Electric current variance and mains voltage ripple variance after being declined according to the line current and before decline judge whether to send out
Raw arc event, specifically includes: the electricity before electric current variance and line current decline after calculating the line current decline
Flow the ratio of variance；The electricity before mains voltage ripple variance and line current decline after calculating the line current decline
The ratio of source voltage ripple variance；If the electricity before electric current variance and line current decline after the line current decline
Flow variance ratio be greater than the first presupposition multiple threshold value, and the line current decline after mains voltage ripple variance with it is described
The ratio of mains voltage ripple variance before line current decline is greater than the second presupposition multiple threshold value, then determines that electric arc thing occurs
Part.
The detection device of arc fault in a kind of DC power-supply system, comprising: obtain module, the acquisitions module is used to obtain
Take the line current signal and power supply voltage signal of the DC power-supply system；First judgment module, the first judgment module
For being judged whether that electric current bust occurs according to the line current signal；Second judgment module, second judgment module are used
In when electric current bust occurs, line current rate of descent is calculated according to the line current signal, and judge the line current
Whether rate of descent is within pre-set interval；Third judgment module, the third judgment module are used under the line current
When drop rate is within the pre-set interval, calculated after the line current declines and before decline according to the line current signal
Electric current variance, and the mains voltage ripple after line current decline and before decline is calculated according to the power supply voltage signal
Variance, and according to the line current decline after and decline before electric current variance and mains voltage ripple variance judge whether to send out
Raw arc event；4th judgment module, the 4th judgment module are used to be greater than in the number that arc event persistently occurs default
When frequency threshold value, determine that arc fault occurs for the DC power-supply system.
The first judgment module is specifically used for calculating line current mutation rate according to the line current signal, and according to
The line current mutation rate judges whether that electric current bust occurs.
The current average in first time window that the first judgment module passes through setting calculates the line current
Mutation rate, the current average in the second time window that second judgment module passes through setting calculate under the line current
Drop rate, the current sampling data in the second time window that the third judgment module passes through setting calculate the electric current variance, and
The mains voltage ripple variance is calculated by the mains voltage ripple sampled value in the second time window of setting, wherein institute
The first time window of setting is less than the second set time window.
The third judgment module is specifically used for calculating the electric current variance and the line electricity after the line current decline
Flow down drop before electric current variance ratio, the line current decline after mains voltage ripple variance and the line current under
The ratio of mains voltage ripple variance before drop, and under the electric current variance and the line current after line current decline
The ratio of electric current variance before drop is greater than the first presupposition multiple threshold value, and the mains voltage ripple side after line current decline
When the ratio of mains voltage ripple variance before the poor decline with the line current is greater than the second presupposition multiple threshold value, determine to occur
Arc event.
A kind of DC power-supply system, the detection device including arc fault in above-mentioned DC power-supply system.
Beneficial effects of the present invention:
The present invention determines that line current is prominent by the line current signal and power supply voltage signal of acquisition DC power-supply system
Drop, line current rate of descent, line current variance and mains voltage ripple variance, to determine that electric arc event occurs for DC power-supply system
Barrier avoids compared with the detection mode of line current spectrum analysis and carries out Fourier transformation or wavelet transformation to line current,
Reduce calculation amount, compared with the detection mode for using machine learning, does not need a large amount of data and learnt, simpler,
It is easier to be realized using low cost monolithic machine.I.e. the detection method of the embodiment of the present invention in time, can be detected easily
Arc fault in DC power-supply system, accuracy is higher, cost is relatively low and can be suitable for a variety of occasions.
Detailed description of the invention
Fig. 1 is the flow chart of the detection method of arc fault in the DC power-supply system of the embodiment of the present invention；
Fig. 2 is the flow chart of the detection method of arc fault in the DC power-supply system of a specific embodiment of the invention；
Fig. 3 is the block diagram of the detection device of arc fault in the DC power-supply system of the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, detection method includes the following steps for arc fault in the DC power-supply system of the embodiment of the present invention:
S1 obtains the line current signal and power supply voltage signal of DC power-supply system.
The detection method of the embodiment of the present invention is suitable for any DC power-supply system, such as with DC-DC converter, photovoltaic electric
The DC power-supply system as DC power supply such as source.
Wherein, line current signal iLWith power supply voltage signal uSIt can be analyzed to the superposition of DC component and AC compounent:
iL=IL+il
uS=US+us
Wherein, ILFor the DC component of line current, ilFor the AC compounent of line current, USFor the direct current of supply voltage
Component, usFor the AC compounent of supply voltage, i.e. mains voltage ripple.
In one embodiment of the invention, timing acquiring and line current, supply voltage and supply voltage line can be stored
Wave, in case the calculating and judgement of subsequent step use.
S2 judges whether that electric current bust occurs according to line current signal.
Specifically, line current mutation rate can be calculated according to line current signal, and is judged according to line current mutation rate
Whether electric current bust is occurred.
S3 then calculates line current rate of descent according to line current signal, and judge line electricity in case of electric current bust
Whether stream rate of descent is within pre-set interval.
S4 calculates line current according to line current signal if line current rate of descent is within pre-set interval
Electric current variance after decline and before decline, and according to the power supply electricity after power supply voltage signal calculating line current decline and before decline
Wave variance is embossed, and electric current variance after declining according to line current and before decline and mains voltage ripple variance judge whether
Arc event occurs.
In one embodiment of the invention, first time window and the second time window can be set, wherein at the first time
Window is lesser time window less than the second time window, i.e. first time window, and the second time window is the biggish time
Window.Line current mutation rate can be calculated by the current average in first time window, and by the second time window
Current average calculate line current rate of descent, and pass through the current sampling data calculating current variance in the second time window
Mains voltage ripple variance is calculated with by the mains voltage ripple sampled value in the second time window.
In one embodiment of the invention, using the C-V characteristic of direct-current arc, in conjunction with DC power-supply system etc.
Circuit model is imitated, obtains electric current last transition formula, is then calculated according to real-time collected supply voltage and line current
The section of electric current decline, i.e., above-mentioned pre-set interval.
In one embodiment of the invention, before the electric current variance and line current decline after line current decline can be calculated
Electric current variance ratio, line current decline after mains voltage ripple variance and line current decline before supply voltage line
The ratio of wave variance.If the electric current variance and the ratio of the electric current variance before line current decline after line current decline are greater than
First presupposition multiple threshold value, and the supply voltage before the mains voltage ripple variance and line current decline after line current decline
The ratio of ripple variance is greater than the second presupposition multiple threshold value, then determines that arc event occurs.
S5 determines DC power-supply system if the number that arc event persistently occurs is greater than preset times threshold value
Arc fault.
Step S3, S4 is repeated, if continuous several times determine that arc event occurs, and number is greater than preset times threshold value, then
It can determine that arc fault occurs for DC power-supply system.
In one particular embodiment of the present invention, as shown in Fig. 2, line current signal and supply voltage can be acquired first
Signal, i.e. timing acquiring simultaneously store line current iL, electric power output voltage uSWith mains voltage ripple signal us.Meanwhile it initializing
The time window count flag position TW and time window quantity Fa for being currently judged as that arc fault occurs is 0.
Set first time length of window can be 10 points, and the second set time window length can be 10000
A point.
Then formula γ can be used due to being timing sampling by calculating line current mutation rate γj=Ij-Ij-2It calculates
The current break rate γ of actual time windowj.Wherein, IjAnd Ij-2Route respectively in+2 first time windows of jth and jth
Current average.Interference can be reduced by being averaged calculating current mutation rate, calculates+2 windows of jth and j-th of window electricity
Change rate between levelling mean value can cross over error caused by catastrophe point to avoid window.
Next it can further determine whether that electric current bust occurs, i.e. whether current point in time is bust point.Specifically, such as
The current break rate γ for the actual time window that fruit is calculatedjIt is negative, andThen there is bust in line current,
It and may be that can store the bust point corresponding time at this time as caused by arc fault.
After detecting line current bust point, new time window can be set with this as the starting point, and TW is once counted
Number, calculates the average value I of the line current in new time windowk, line current rate of descentWherein,
ImeanLine current average value before bust occurs for line current.
If line current rate of descent ηkCalculated result in pre-set interval [ηmin, ηmmax] within, then to line current and
Mains voltage ripple data are handled, and line current variance and mains voltage ripple variance are calculated.In a tool of the invention
In body embodiment, respective lines electric current IL_arc, the corresponding pre-set interval of supply voltage E it is as shown in table 1.
Table 1
Specifically, the variance I of the line current of actual time window can be calculatedvar_k, and with occur electric current bust before line
The variance I of road electric currentvarIt is compared, if the I of k-th of windowvar_kIt is the side that the line current before line current bust occurs
Poor IvarK2 times or more, i.e. Ivar_k/IvarWhen > K2, then arc fault may occur for current window；Calculate actual time window
The variance u of mains voltage ripplevar_k, and the variance u with the mains voltage ripple before generation electric current bustvarIt is compared, if
The u of k-th of windowvar_kIt is the variance u that the mains voltage ripple before line current bust occursvarK3 times or more, i.e. uvar_k/
uvar> K3, then arc fault may occur for actual time window.Simultaneously or successively judgement meets Ivar_k/Ivar> K2 and uvar_k/
uvarWhen two conditions of > K3, generation arc event can determine that.
When determining to occur arc event, Fa is once counted.In the case where TW is less than K4, if Fa is greater than K5,
It can determine that arc fault occurs for DC power-supply system.
After determining that arc fault occurs for DC power-supply system, arc fault alarm can be carried out, corresponding guarantor can also be taken
Shield movement, such as control direct current supply switch disconnect, and to reduce or avoid fault electric arc bring risk, ensure direct current supply system
The safety and reliability of system, electrical equipment.
In conclusion in DC power-supply system according to an embodiment of the present invention arc fault detection method, pass through acquisition
The line current signal and power supply voltage signal of DC power-supply system determine line current bust, line current rate of descent, route
Electric current variance and mains voltage ripple variance, to determine that arc fault occurs for DC power-supply system, with line current spectrum analysis
Detection mode compare, avoid and Fourier transformation or wavelet transformation carried out to line current, reduce calculation amount, and use machine
The detection mode of device study is compared, and is not needed a large amount of data and is learnt, simpler, be easier to using low cost monolithic machine
It is realized.I.e. the detection method of the embodiment of the present invention can in time, easily detect the event of the electric arc in DC power-supply system
Barrier, accuracy is higher, cost is relatively low and can be suitable for a variety of occasions.
The detection method of arc fault in DC power-supply system to realize above-described embodiment, the present invention also propose a kind of straight
Flow the detection device of arc fault in power supply system.
As shown in figure 3, in the DC power-supply system of the embodiment of the present invention arc fault detection device, including obtain module
10, first judgment module 20, the second judgment module 30, third judgment module 40 and the 4th judgment module 50.Wherein, module is obtained
10 for obtaining the line current signal and power supply voltage signal of DC power-supply system；First judgment module 20 is used for according to route
Current signal judges whether that electric current bust occurs；Second judgment module 30 is used for when electric current bust occurs, according to line current
Signal calculates line current rate of descent, and judges whether line current rate of descent is within pre-set interval；Third judgment module
40 for when route current reduction ratio be within pre-set interval, according to line current signal calculate after line current decline with
Electric current variance before decline, and the mains voltage ripple side after line current declines and before decline is calculated according to power supply voltage signal
Difference, and electric current variance after being declined according to line current and before decline and mains voltage ripple variance judge whether that electric arc occurs
Event；4th judgment module 50 is used to determine that direct current supplies when the number that arc event persistently occurs is greater than preset times threshold value
Arc fault occurs for electric system.
The detection device of the embodiment of the present invention is suitable for any DC power-supply system, such as with DC-DC converter, photovoltaic electric
The DC power-supply system as DC power supply such as source.
Wherein, line current signal iLWith power supply voltage signal uSIt can be analyzed to the superposition of DC component and AC compounent:
iL=IL+il
uS=US+us
Wherein, ILFor the DC component of line current, ilFor the AC compounent of line current, USFor the direct current of supply voltage
Component, usFor the AC compounent of supply voltage, i.e. mains voltage ripple.
In one embodiment of the invention, obtain module 10 can timing acquiring and store line current, supply voltage and
Mains voltage ripple, in case the calculating and judgement of other modules use.
First judgment module 20 specifically can calculate line current mutation rate according to line current signal, and according to line current
Mutation rate judges whether that electric current bust occurs.
In one embodiment of the invention, first judgment module 20 can pass through the electric current in the first time window of setting
Mean value calculation line current mutation rate, the second judgment module 30 can pass through the current average in the second time window of setting
Line current rate of descent is calculated, third judgment module 40 can calculate electricity by the current sampling data in the second time window of setting
Variance is flowed, and mains voltage ripple variance is calculated by the mains voltage ripple sampled value in the second time window of setting.Its
In, set first time window is less than the second set time window, i.e. first time window is lesser time window
Mouthful, the second time window is biggish time window.
In one particular embodiment of the present invention, set first time length of window can be 10 points, set
The second time window length can be 10000 points.
Due to being timing sampling, first judgment module 20 can pass through formula γj=Ij-Ij-2Calculate actual time window
Current break rate γj.Wherein, IjAnd Ij-2Line current average value respectively in+2 first time windows of jth and jth.
Interference can be reduced by being averaged calculating current mutation rate, is calculated between+2 windows of jth and j-th of window current average
Change rate can be to avoid window across error caused by catastrophe point.
If the current break rate γ for the actual time window being calculatedjIt is negative, andThen the first judgement
Module 20 can determine whether that bust occurs in line current, and may be that can store bust point pair at this time as caused by arc fault
The time answered.
After detecting line current bust point, new time window can be set with this as the starting point, judge mould by second
Block 30 calculates the average value I of the line current in new time windowk, line current rate of descentWherein,
ImeanLine current average value before bust occurs for line current.
If line current rate of descent ηkCalculated result within pre-set interval, then third judgment module 40 can be to route
Electric current and mains voltage ripple data are handled, and line current variance and mains voltage ripple variance are calculated.Of the invention
In one embodiment, above-mentioned pre-set interval can determine in the following manner: using the C-V characteristic of direct-current arc, in conjunction with direct current
The equivalent-circuit model of power supply system obtains electric current last transition formula, then according to real-time collected supply voltage and line
Road electric current calculates the section of electric current decline, i.e., above-mentioned pre-set interval.In one particular embodiment of the present invention, corresponding line
Road electric current IL_arc, the corresponding pre-set interval of supply voltage E it is as shown in table 1.
In one embodiment of the invention, third judgment module 40 can specifically calculate the electric current side after line current decline
Difference with line current decline before electric current variance ratio, line current decline after mains voltage ripple variance and line current
The ratio of mains voltage ripple variance before decline, and before the electric current variance and line current decline after line current decline
The ratio of electric current variance is greater than the first presupposition multiple threshold value, and mains voltage ripple variance and line electricity after line current decline
When the ratio of mains voltage ripple variance before flowing down drop is greater than the second presupposition multiple threshold value, determine that arc event occurs.Into one
For step, third judgment module 40 can calculate the variance I of the line current of actual time windowvar_k, and with occur electric current bust
The variance I of preceding line currentvarIt is compared, if the I of k-th of windowvar_kIt is the line electricity occurred before line current bust
The variance I of streamvarK2 times or more, i.e. Ivar_k/IvarWhen > K2, then arc fault may occur for current window；When calculating current
Between window mains voltage ripple variance uvar_k, and the variance u with the mains voltage ripple before generation electric current bustvarCompared
Compared with if the u of k-th of windowvar_kIt is the variance u that the mains voltage ripple before line current bust occursvarK3 times or more,
That is uvar_k/uvar> K3, then arc fault may occur for actual time window.Simultaneously or successively judgement meets Ivar_k/Ivar> K2
And uvar_k/uvarWhen two conditions of > K3, generation arc event can determine that.
If 40 continuous several times of third judgment module determine that arc event occurs, and number is greater than preset times threshold value, then
4th judgment module 50 can determine that arc fault occurs for DC power-supply system.
In conclusion in DC power-supply system according to an embodiment of the present invention arc fault detection device, pass through acquisition
Module obtains the line current signal and power supply voltage signal of DC power-supply system, determines line by first to fourth judgment module
Road electric current bust, line current rate of descent, line current variance and mains voltage ripple variance, to determine that DC power-supply system is sent out
Raw arc fault, compared with the detection mode of line current spectrum analysis, avoid to line current carry out Fourier transformation or
Wavelet transformation reduces calculation amount, compared with the detection mode for using machine learning, does not need a large amount of data and is learnt,
It is simpler, be easier to be realized using low cost monolithic machine.I.e. the detection method of the embodiment of the present invention can in time, conveniently
Ground detects the arc fault in DC power-supply system, and accuracy is higher, cost is relatively low and can be suitable for a variety of occasions.
The detection device of arc fault, the present invention also propose a kind of direct current in the DC power-supply system of corresponding above-described embodiment
Power supply system.
The DC power-supply system of the embodiment of the present invention, electricity in the DC power-supply system including any of the above-described embodiment of the present invention
The detection device of arc failure.
The DC power-supply system of the embodiment of the present invention carries out arc fault inspection by the detection device of any of the above-described embodiment
It surveys, can be improved reliability and safety.
In the description of the present invention, term " first ", " second " are used for description purposes only, and should not be understood as instruction or dark
Show relative importance or implicitly indicates the quantity of indicated technical characteristic.The feature of " first ", " second " is defined as a result,
It can explicitly or implicitly include one or more of the features.The meaning of " plurality " is two or more, unless
Separately there is clearly specific restriction.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. the detection method of arc fault in a kind of DC power-supply system, which comprises the following steps:
Obtain the line current signal and power supply voltage signal of the DC power-supply system；
Judged whether that electric current bust occurs according to the line current signal；
In case of electric current bust, then line current rate of descent is calculated according to the line current signal, and judge the route
Whether current reduction ratio is within pre-set interval；
If the line current rate of descent is within the pre-set interval, according to line current signal calculating
Electric current variance after line current decline and before decline, and after calculating line current decline according to the power supply voltage signal
With the mains voltage ripple variance before decline, and according to the line current decline after and decline before electric current variance and power supply
Voltage ripple variance judges whether that arc event occurs；
If the number that arc event persistently occurs is greater than preset times threshold value, determine that electric arc occurs for the DC power-supply system
Failure.
2. the detection method of arc fault in DC power-supply system according to claim 1, which is characterized in that according to described
Line current signal judges whether that electric current bust occurs, specifically includes:
Line current mutation rate is calculated according to the line current signal；
Judged whether that electric current bust occurs according to the line current mutation rate.
3. the detection method of arc fault in DC power-supply system according to claim 2, which is characterized in that setting first
Time window and the second time window calculate the line current by the current average in the first time window and are mutated
Rate, and the line current rate of descent is calculated by the current average in second time window, and pass through described the
Current sampling data in two time windows calculates the electric current variance and by the supply voltage line in second time window
Wave sampled value calculates the mains voltage ripple variance, wherein the first time window is less than second time window.
4. the detection method of arc fault in DC power-supply system according to claim 1, which is characterized in that wherein, benefit
Current reduction ratio section public affairs are obtained in conjunction with the equivalent-circuit model of the DC power-supply system with the C-V characteristic of direct-current arc
Then formula calculates the pre-set interval according to real-time collected supply voltage and line current.
5. the detection method of arc fault in DC power-supply system according to claim 3, which is characterized in that according to described
Electric current variance and mains voltage ripple variance after line current decline and before decline judge whether that arc event occurs, specific to wrap
It includes:
The ratio of the electric current variance before electric current variance and line current decline after calculating the line current decline；
The supply voltage line before mains voltage ripple variance and line current decline after calculating the line current decline
The ratio of wave variance；
If the electric current variance and the ratio of the electric current variance before line current decline after the line current decline are greater than
First presupposition multiple threshold value, and before the mains voltage ripple variance and line current decline after line current decline
The ratio of mains voltage ripple variance is greater than the second presupposition multiple threshold value, then determines that arc event occurs.
6. the detection device of arc fault in a kind of DC power-supply system characterized by comprising
Obtain module, the line current signal and supply voltage letter for obtaining module and being used to obtain the DC power-supply system
Number；
First judgment module, the first judgment module are used to be judged whether according to the line current signal that electric current to occur prominent
Drop；
Second judgment module, second judgment module is used for when electric current bust occurs, according to the line current signal meter
Line current rate of descent is calculated, and judges whether the line current rate of descent is within pre-set interval；
Third judgment module, the third judgment module in the line current rate of descent for being within the pre-set interval
When, the electric current variance after the line current declines and before decline is calculated according to the line current signal, and according to the electricity
Source voltage signal calculates the mains voltage ripple variance after the line current declines and before decline, and according to the line electricity
Electric current variance and mains voltage ripple variance after dropping and before decline is flowed down to judge whether that arc event occurs；
4th judgment module, the 4th judgment module are used to be greater than preset times threshold value in the number that arc event persistently occurs
When, determine that arc fault occurs for the DC power-supply system.
7. the detection device of arc fault in DC power-supply system according to claim 6, which is characterized in that described first
Judgment module is specifically used for calculating line current mutation rate according to the line current signal, and is mutated according to the line current
Rate judges whether that electric current bust occurs.
8. the detection device of arc fault in DC power-supply system according to claim 7, which is characterized in that described first
The current average in first time window that judgment module passes through setting calculates the line current mutation rate, and described second sentences
The current average in the second time window that disconnected module passes through setting calculates the line current rate of descent, the third judgement
The current sampling data in the second time window that module passes through setting calculates the electric current variance, and passes through the second time of setting
Mains voltage ripple sampled value in window calculates the mains voltage ripple variance, wherein set first time window
Less than the second set time window.
9. the detection device of arc fault in DC power-supply system according to claim 8, which is characterized in that the third
Judgment module is specifically used for calculating the electric current variance after the line current declines and the electric current side before line current decline
Difference ratio, the line current decline after mains voltage ripple variance and the line current decline before supply voltage line
The ratio of wave variance, and the electric current variance before the electric current variance and line current decline after line current decline
Ratio is greater than the first presupposition multiple threshold value, and mains voltage ripple variance and the line current after line current decline
When the ratio of mains voltage ripple variance before decline is greater than the second presupposition multiple threshold value, determine that arc event occurs.
10. a kind of DC power-supply system, which is characterized in that including the direct current supply according to any one of claim 6-9
The detection device of arc fault in system.
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