CN110460305A - Fault detection method, device, readable medium and the electronic equipment of photovoltaic array - Google Patents
Fault detection method, device, readable medium and the electronic equipment of photovoltaic array Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention discloses a kind of fault detection method of photovoltaic array, device, readable medium and electronic equipments, this method comprises: the current value of each group of string of acquisition photovoltaic array；It determines the intermediate value and median absolute deviation estimator of each current value, and upper limit current, lower current is determined according to the intermediate value and the median absolute deviation estimator；Dispersion ratio is determined according to each current value；According to the upper limit current, the lower current and the dispersion ratio, determine whether each described current value is exceptional value；When there are exceptional value described at least one, determine that corresponding group of string of each exceptional value breaks down.According to the technical solution of the present invention, the group string to break down in photovoltaic array more can be easily and rapidly determined.
Description
Technical field
The present invention relates to the fault detection method of energy technology field more particularly to photovoltaic array, device, readable medium and
Electronic equipment.
Background technique
Photovoltaic array includes multiple groups of strings, each group of string be exposed under complicated outdoor environment for a long time be easy to cause it is various
The failure of various kinds, these failures easily lead to the decrease of power generation of photovoltaic array, while may cause fire, therefore be frequently necessary to
Fault detection is carried out to position the group string to break down to photovoltaic array, and then improves the safety and service life of component.
Currently, mainly determining the group string to break down in photovoltaic array by machine learning algorithm.
But when determining the group string to break down in photovoltaic array using machine learning algorithm, computational complexity is high, needs
The corresponding model of a large amount of time training is consumed, and this method is only applicable to specific photovoltaic array.Therefore, how to realize more
Easily and rapidly determine that the group string to break down in photovoltaic array then becomes urgent problem to be solved.
Summary of the invention
The present invention provides a kind of fault detection method of photovoltaic array, device, readable medium and electronic equipments, can be more
Easily and rapidly determine the group string to break down in photovoltaic array.
In a first aspect, the present invention provides a kind of fault detection methods of photovoltaic array, comprising:
Acquire the current value of each group of string of photovoltaic array；
Determine the intermediate value and median absolute deviation estimator of each current value, and according to the intermediate value and the intermediate value
Absolute deviation estimator determines upper limit current, lower current；
Dispersion ratio is determined according to each current value；
According to the upper limit current, the lower current and the dispersion ratio, determine each described current value whether be
Exceptional value；
When there are exceptional value described at least one, determine that corresponding group of string of each exceptional value breaks down.
Preferably,
The intermediate value and median absolute deviation estimator of each current value of determination, and according to the intermediate value and described
Median absolute deviation estimator determines upper limit current, lower current, comprising:
Determine the intermediate value of each current value；
Median absolute deviation estimator is calculated by following first formula；Wherein,
First formula includes:
Wherein, S characterizes median absolute deviation estimator, xiCharacterize i-th of current value,Characterize intermediate value；
Lower current is calculated by following second formula；Wherein,
Second formula includes:
Wherein, IminCharacterize lower current, α be constant,Characterize intermediate value, S characterizes median absolute deviation estimator；
Pass through following third formula calculating upper limit electric current；Wherein,
The third formula includes:
Wherein, ImaxCharacterize upper limit current.
Preferably,
It is described that dispersion ratio is determined according to each current value, comprising:
Calculate the mean value of each current value；
According to the standard deviation of each current value of the mean value computation；
The ratio of the standard deviation and the mean value is determined as dispersion ratio.
Preferably,
It is described according to the upper limit current, the lower current and the dispersion ratio, determine that each described current value is
No is exceptional value, comprising:
A1, the current value for selecting a unselected mistake；
Whether A2, the detection current value are located between the lower current and the upper limit current, if otherwise executed
A3 if it is executes A5；
Whether A3, the detection dispersion ratio are more than preset threshold, A4 are if it is executed, if otherwise executing A5；
A4, the current value is determined as to exceptional value, executes A5；
A5, the current value there are unselected mistake is detected whether, if it is, executing A1.
Second aspect, the present invention provides a kind of fault detection means of photovoltaic array, comprising:
Data acquisition module, the current value of each group of string for acquiring photovoltaic array；
Section determining module, for determining the intermediate value and median absolute deviation estimator of each current value, and according to
The intermediate value and the median absolute deviation estimator determine upper limit current, lower current；
Dispersion ratio determining module, for determining dispersion ratio according to each current value；
Detection module, for determining described in each according to the upper limit current, the lower current and the dispersion ratio
Whether current value is exceptional value；
Fault determination module, for determining that each exceptional value is right respectively when there are exceptional value described at least one
The group string answered breaks down.
Preferably,
The section determining module, comprising: median determining unit, the first computing unit, the second computing unit and third meter
Calculate unit；Wherein,
The median determining unit, for determining the intermediate value of each current value；
First computing unit, for calculating median absolute deviation estimator by following first formula；Wherein,
First formula includes:
Wherein, S characterizes median absolute deviation estimator, xiCharacterize i-th of current value,Characterize intermediate value；
Second computing unit, for calculating lower current by following second formula；Wherein,
Second formula includes:
Wherein, IminCharacterize lower current, α be constant,Characterize intermediate value, S characterizes median absolute deviation estimator；
The third computing unit, for passing through following third formula calculating upper limit electric current；Wherein,
The third formula includes:
Wherein, ImaxCharacterize upper limit current.
Preferably,
The dispersion ratio determining module, comprising: average calculation unit, standard deviation computing unit and dispersion ratio determination unit；
Wherein,
The average calculation unit, for calculating the mean value of each current value；
The standard deviation computing unit, for the standard deviation according to each current value of the mean value computation；
The dispersion ratio determination unit, for the ratio of the standard deviation and the mean value to be determined as dispersion ratio.
Preferably,
The detection module, comprising: selecting unit, section detection unit, dispersion ratio detection unit, exceptional value determination unit
And detection unit；Wherein,
The selecting unit, for selecting the current value of a unselected mistake；
The section detection unit, for detecting whether the current value is located at the lower current and the upper limit current
Between, the detection unit is if it is triggered, if otherwise triggering the dispersion ratio detection unit；
The dispersion ratio detection unit, for detecting whether the dispersion ratio surpasses under the triggering of the section detection unit
Preset threshold is crossed, the exceptional value determination unit is if it is triggered, if otherwise triggering the detection unit；
The exceptional value determination unit for the current value to be determined as exceptional value, and triggers the detection unit；
The detection unit, for detecting whether there are the current value of unselected mistake, if it is, described in triggering
Selecting unit.
The third aspect, the present invention provides a kind of readable mediums, including execute instruction, when the processor of electronic target equipment
When executing instruction described in execution, the electronic target equipment executes the method as described in any in first aspect.
Fourth aspect is executed instruction including processor and being stored with the present invention provides a kind of electronic target equipment
Memory, when executing instruction described in the processor executes memory storage, the processor executes such as first party
Any method in face.
The present invention provides a kind of fault detection method of photovoltaic array, this method passes through each group of acquisition photovoltaic array
The current value of string determines the intermediate value and median absolute deviation estimator of each current value, then according to the intermediate value and the intermediate value
Absolute deviation estimator determines the upper limit current and lower current of each current value, further determine that out each current value from
The rate of dissipating, can determine whether each current value is exceptional value according to upper limit current, lower current and dispersion ratio, different if it exists
Corresponding group of string of the exceptional value can be then determined as failure group string by constant value.To sum up, the skill provided through the embodiment of the present invention
Art scheme, the fault detection method of photovoltaic array only pass through acquisition, calculating and comparison procedure, without consuming a large amount of time training
Model more can easily and rapidly determine the group string to break down in photovoltaic array.
Further effect possessed by above-mentioned non-usual preferred embodiment adds hereinafter in conjunction with specific embodiment
With explanation.
Detailed description of the invention
It in order to illustrate the embodiments of the present invention more clearly or existing technical solution, below will be to embodiment or the prior art
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only in the present invention
The some embodiments recorded without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is a kind of flow diagram of the fault detection method for photovoltaic array that one embodiment of the invention provides；
Fig. 2 is the flow diagram of the fault detection method for another photovoltaic array that one embodiment of the invention provides；
Fig. 3 is a kind of structural schematic diagram of the fault detection means for photovoltaic array that one embodiment of the invention provides；
Fig. 4 is the structural schematic diagram of the fault detection means for another photovoltaic array that one embodiment of the invention provides；
Fig. 5 is the structural schematic diagram of the fault detection means for another photovoltaic array that one embodiment of the invention provides；
Fig. 6 is the structural schematic diagram of the fault detection means for another photovoltaic array that one embodiment of the invention provides；
Fig. 7 is a kind of structural schematic diagram for electronic target equipment that one embodiment of the invention provides.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment and accordingly
Technical solution of the present invention is clearly and completely described in attached drawing.Obviously, described embodiment is only a part of the invention
Embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making wound
Every other embodiment obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
As described in Figure 1, the embodiment of the invention provides a kind of fault detection methods of photovoltaic array, including following each step
It is rapid:
101, the current value of each group of string of photovoltaic array is acquired；
102, the intermediate value and median absolute deviation estimator of each current value are determined, and according to the intermediate value and described
Median absolute deviation estimator determines upper limit current, lower current；
103, dispersion ratio is determined according to each current value；
104, according to the upper limit current, the lower current and the dispersion ratio, determine that each described current value is
No is exceptional value；
105, when there are exceptional value described at least one, determine that event occurs for corresponding group of string of each exceptional value
Barrier.
Embodiment as shown in Figure 1, the present invention provides a kind of fault detection method of photovoltaic array, this method is by adopting
The current value for collecting each group of string of photovoltaic array, determines the intermediate value and median absolute deviation estimator of each current value, then
The upper limit current and lower current of each current value are determined according to the intermediate value and the median absolute deviation estimator, further really
The dispersion ratio of each current value is made, can determine that each current value is according to upper limit current, lower current and dispersion ratio
No is exceptional value, and exceptional value, then can be determined as failure group string for corresponding group of string of the exceptional value if it exists.To sum up, pass through
Technical solution provided in an embodiment of the present invention, the fault detection method of photovoltaic array only pass through acquisition, calculating and comparison procedure, nothing
A large amount of time training pattern need to be consumed, more can easily and rapidly determine the group string to break down in photovoltaic array.
It should be understood by those skilled in the art that, photovoltaic array includes multiple solar components, several are connected on one
The solar components risen are determined as a group string.
It will be apparent that the current value of each group of string of acquisition photovoltaic array, particularly relates to adopt under same time point
Collect photovoltaic array each group of string current value, or under extremely short time interval acquire photovoltaic array each group of string electric current
Value.
In one embodiment of the present of invention, the intermediate value and median absolute deviation of each current value of determination are estimated
Amount, and upper limit current, lower current are determined according to the intermediate value and the median absolute deviation estimator, comprising:
Determine the intermediate value of each current value；
Median absolute deviation estimator is calculated by following (1):
Wherein, S characterizes median absolute deviation estimator, xiCharacterize i-th of current value,Characterize intermediate value；
Lower current is calculated by following (2):
Wherein, IminLower current is characterized, α is constant,Intermediate value is characterized, S characterizes median absolute deviation estimator；
Pass through following (3) calculating upper limit electric current:
Wherein, ImaxCharacterize upper limit current.
In the embodiment, intermediate value is to measure the index of each current value central tendency, and constant α and median absolute deviation are estimated
The product of amount can indicate the tolerance value of the intermediate value of each current value, and the size of the tolerance value can more accurately
The departure for reacting the intermediate value of each current value when each group of string operates normally in photovoltaic array, then can be by each current value
The sum of intermediate value and tolerance value (product of constant α and median absolute deviation estimator) is as upper limit current, tolerance value
For the difference of (product of constant α and median absolute deviation estimator) and each current value as lower current, lower current can be more
Add the minimum value of the current value of output of each group of string of accurately reflection photovoltaic array when operating normally, upper limit current can be with
More accurately reflect the maximum value of the current value of output of each group of string of photovoltaic array when operating normally.
It should be noted that α is constant, the value of the constant is related with the level of pollution of group string, if event occurs in photovoltaic array
Barrier group string can then illustrate that the group string of photovoltaic array is contaminated, organized in photovoltaic array string level of pollution be in photovoltaic array by
The case where ratio that string number is always organized to the group string number Zhan of pollution, level of pollution very high (33%) of the group string in photovoltaic array
Under, α can take 3.
Specifically, median absolute deviation estimator is the intermediate value of the absolute difference of the corresponding intermediate value of each current value
Product with 1.4826 determines the absolute value of the difference by calculating the difference of each current value with the intermediate value of each current value
Intermediate value, the value that the product of the intermediate value and constant 1.4286 obtains is determined as median absolute deviation estimator.
For example, photovoltaic array includes 5 group strings, the current value of 5 group strings of acquisition is respectively 0.2,0.3,0.4,
0.5,0.9, the sum of current value is odd number, then the median of each current value is intermediate value, i.e., the intermediate value of each current value is
0.4, the difference of each current value and the intermediate value is (- 0.2), (- 0.1), 0,0.1,0.5 respectively, then the absolute value of each difference
Intermediate value be 0.1, then median absolute deviation estimator be 1.4826*0.1, it is assumed that α 3, then lower current be (1.4826*
0.1*3-0.4), upper limit current is (1.4826*0.1*3+0.4).
It is described that dispersion ratio is determined according to each current value in one embodiment of the present of invention, comprising:
Calculate the mean value of each current value；
According to the standard deviation of each current value of the mean value computation；
The ratio of the standard deviation and the mean value is determined as dispersion ratio.
In the embodiment, the mean value and standard deviation of the current value of each group of string are calculated, by the ratio of standard deviation and mean value
Be determined as dispersion ratio, the size of dispersion ratio it may be said that each group of string in Mingguang City's photovoltaic array operation conditions and each current value
Between difference degree, the smaller operation conditions that can more illustrate each group of string in photovoltaic array of dispersion ratio is more stable and each
Difference between current value is smaller, on the contrary then illustrate that the operation conditions of each group of string in photovoltaic array is more unstable and each
Difference between current value is bigger.
For example, being I with the current value of 3 group strings of the photovoltaic array of acquisition1、I2、I3For, calculate I1、I2、I3's
Mean value is I, and according to mean value computation I1、I2、I3Standard deviation be S, then the dispersion ratio of photovoltaic array be S/I, the dispersion ratio
Size it may be said that 3 group strings in Mingguang City's photovoltaic array operation conditions and I1、I2、I3Between difference degree, if dispersion ratio compared with
It is small, then illustrate that the operation conditions of 3 group strings in photovoltaic array is more stable and I1、I2、I3Difference between three current values
Smaller (I1、I2、I3It is not exceptional value), i.e., there is no failures for the three of the photovoltaic array group string.
It is described according to the upper limit current, the lower current and the dispersion ratio in one embodiment of the present of invention, really
Whether each fixed described current value is exceptional value, comprising:
A1, the current value for selecting a unselected mistake；
Whether A2, the detection current value are located between the lower current and the upper limit current, if otherwise executed
A3 if it is executes A5；
Whether A3, the detection dispersion ratio are more than preset threshold, A4 are if it is executed, if otherwise executing A5；
A4, the current value is determined as to exceptional value, executes A5；
A5, the current value there are unselected mistake is detected whether, if it is, executing A1.
In the embodiment, since solar components inevitably will appear process deviation during manufacturing production,
The impossible electric property having the same of each solar components caused, by each solar energy group of different electric properties
The current value of the output for each group of string that part is composed in series can have a deviation, and deviation is in certain zone of reasonableness, at this point, logical
The intermediate value for calculating each current value and median absolute deviation estimator are crossed, is determined according to intermediate value and median absolute deviation estimator
Upper limit current and lower current out, the range between lower current and upper limit current are each group of strings of photovoltaic array just
Often zone of reasonableness when operation, i.e. current value in the zone of reasonableness can illustrate that corresponding group of string of the current value is up
, when a current value is not between lower current and upper limit current, then illustrate that the current value deviates other current values, simultaneously
Corresponding group of string of the current value may perform poor relative to other group strings, at this time, it may be necessary to which detecting can illustrate in photovoltaic array
Each group of string operation conditions and each current value between the dispersion ratio of difference degree whether be more than preset threshold, if detection
The result is that the dispersion ratio is not above preset threshold, then illustrate the operation conditions stabilization of each group of string of photovoltaic array and each electricity
Difference between flow valuve is smaller, i.e., the current value is not exceptional value, conversely, the current value can be then determined as to exceptional value, accordingly
, and if only if a current value not between lower current and upper limit current, the dispersion ratio of each current value be more than default threshold
When value, the current value is just determined as exceptional value, further determines that corresponding group of string of the exceptional value breaks down, later, is used
Family needs to carry out overall improvement to photovoltaic array.
In a kind of possible embodiment, by judging the operating status of each group of string in photovoltaic array and each
Difference degree between current value, detects each current value later and whether deviates other current values and determine each described electric current
Whether value is exceptional value, i.e., detection dispersion ratio whether be more than preset threshold, if testing result be it is yes, detect each current value
Whether between lower current and upper limit current, if testing result be it is no, which is determined as exceptional value.
It should be noted that the value of preset threshold needs to be determined according to the actual operation conditions of photovoltaic array, the threshold value
Value range can be the arbitrary value between 1%~10%, for example be 5%.
For example, preset threshold 5%, dispersion ratio 4%, lower current 0.05, upper limit current 0.8, one
Whether possible each current value of determination of kind is to select some current value to be detected in the implementation of exceptional value, than
Such as 0.9,0.9A is detected not between lower current 0.05 and upper limit current 0.8, further detects that dispersion ratio 4% does not have
More than preset threshold 5%, that is, it can determine that 0.9 is not exceptional value, there is no failures for corresponding group of string of the current value, based on identical
Principle determine all group strings to break down in photovoltaic array by testing to each current value, can further lead to
It crosses and the group string to break down in photovoltaic array is safeguarded, and then improve the safety and service life of component, improve light
The overall operation situation of photovoltaic array；In alternatively possible determination each current value whether in the implementation for being exceptional value,
It detects that dispersion ratio 4% is not above preset threshold 5%, can determine that each current value is not exceptional value later.
In order to more clearly illustrate technical solution of the present invention, referring to FIG. 2, the embodiment of the invention provides another kinds
The fault detection method of photovoltaic array can specifically include following each step:
Step 201, the current value of each group of string of photovoltaic array is acquired.
Here, the current value of corresponding each group of string is sometime put in acquisition.
With t1For moment collects the current value 1,1.2,1.4,1.6 of 4 group strings, acquisition is sometime put corresponding each
The current value of a group of string is referred specifically in t1The current value that moment collects 4 group strings is respectively 1,1.2,1.4,1.6.
Step 202, intermediate value, the difference of each current value and intermediate value for calculating each current value, by the absolute value of the difference
Intermediate value be determined as median absolute deviation estimator with the 1.4286 obtained value of product.
For current value to collect 4 group strings is respectively 1,1.2,1.4,1.6, the median of this 4 current values
Average value is the intermediate value of four current values, i.e., the intermediate value be 1.2 and 1.4 average value 1.3, this four current values and the intermediate value
Difference is -0.3, -0.1,0.1,0.3, and the intermediate value of the absolute value of the difference is 0.2, then the value 0.29652 that 0.2*1.4826 is obtained
As median absolute deviation estimator.
Step 203, the numerical value for determining constant α are determined according to the product of intermediate value and constant α and median absolute deviation estimator
Lower current and upper limit current.
Constant α can carry out value in conjunction with the practical operation situation of photovoltaic array.
Step 204, the mean value and standard deviation for calculating each current value, the ratio of standard deviation and mean value are determined as discrete
Rate.
The dispersion ratio can reflect out the operation conditions of each group of string in the acquisition time corresponding photovoltaic array with
And the difference degree between each current value.
Step 205, the current value for selecting a unselected mistake.
Whether step 206, the current value detected and selected are between lower current and upper limit current, if it is not, then executing step
Rapid 207, if so, thening follow the steps 209.
Corresponding group of string of each current value between lower current and upper limit current does not break down.
Whether step 207, detection dispersion ratio are more than preset threshold, if so, 208 are thened follow the steps, it is no to then follow the steps
209。
Dispersion ratio then illustrates that the operation conditions of each group of string in photovoltaic array is not sufficiently stable more than preset threshold, at this point,
It needs to carry out photovoltaic array whole adjustment, it is ensured that the safety of photovoltaic array follow-up operation improves each in photovoltaic array
The service life of a component.
The current value of selection is determined as exceptional value by step 208, executes step 209.
The exceptional value deviates considerably from other current values.
Step 209 detects whether that there are the current values of unselected mistake, if so, thening follow the steps 205, otherwise terminates
Current process.
Based on design identical with embodiment of the present invention method, referring to FIG. 3, the embodiment of the invention also provides a kind of light
The fault detection means of photovoltaic array, comprising:
Data acquisition module 301, the current value of each group of string for acquiring photovoltaic array；
Section determining module 302, for determining the intermediate value and median absolute deviation estimator of each current value, and root
Upper limit current, lower current are determined according to the intermediate value and the median absolute deviation estimator；
Dispersion ratio determining module 303, for determining dispersion ratio according to each current value；
Detection module 304, for determining each according to the upper limit current, the lower current and the dispersion ratio
Whether the current value is exceptional value；
Fault determination module 305, for when there are exceptional value described at least one, determining each exceptional value difference
Corresponding group of string breaks down.
Referring to FIG. 4, in one embodiment of the invention, the section determining module 302, comprising: median determining unit
3021, the first computing unit 3022, the second computing unit 3023 and third computing unit 3024；Wherein,
The median determining unit 3021, for determining the intermediate value of each current value；
First computing unit 3022, for calculating median absolute deviation estimator by following first formula；Wherein,
First formula includes:
Wherein, S characterizes median absolute deviation estimator, xiCharacterize i-th of current value,Characterize intermediate value；
Second computing unit 3023, for calculating lower current by following second formula；Wherein,
Second formula includes:
Wherein, IminCharacterize lower current, α be constant,Characterize intermediate value, S characterizes median absolute deviation estimator；It is described
Third computing unit 3024, for passing through following third formula calculating upper limit electric current；Wherein,
The third formula includes:
Wherein, ImaxCharacterize upper limit current.
Referring to FIG. 5, in one embodiment of the invention, dispersion ratio determining module 303, comprising: average calculation unit 3031,
Standard deviation computing unit 3032 and dispersion ratio determination unit 3033；Wherein,
The average calculation unit 3031, for calculating the mean value of each current value；
The standard deviation computing unit 3032, for the standard deviation according to each current value of the mean value computation；
The dispersion ratio determination unit 3033, for the ratio of the standard deviation and the mean value to be determined as dispersion ratio.
Referring to FIG. 6, in one embodiment of the invention, the detection module 304, comprising: selecting unit 3041, section
Detection unit 3042, dispersion ratio detection unit 3043, exceptional value determination unit 3044 and detection unit 3045；Wherein,
The selecting unit 3041, for selecting the current value of a unselected mistake；
The section detection unit 3042, for detecting whether the current value is located at the lower current and the upper limit
Between electric current, the detection unit 3045 is if it is triggered, if otherwise triggering the dispersion ratio detection unit 3043；
The dispersion ratio detection unit 3043, it is described discrete for being detected under the triggering of the section detection unit 3042
Whether rate is more than preset threshold, if it is triggers the exceptional value determination unit 3044, if it is single otherwise to trigger the detection
Member 3045；
The exceptional value determination unit 3044, for the current value to be determined as exceptional value, and it is single to trigger the detection
Member 3045；
The detection unit 3045, for detecting whether there are the current value of unselected mistake, if it is, triggering
The selecting unit 3041.
For convenience of description, it describes to be divided into various units when apparatus above embodiment with function or module describes respectively,
The function of each unit or module can be realized in the same or multiple software and or hardware in carrying out the present invention.
Fig. 7 is the structural schematic diagram of a kind of electronic equipment provided in an embodiment of the present invention.In hardware view, the electronic equipment
Including processor 701 and it is stored with the memory 702 executed instruction, optionally further comprising internal bus 703 and network interface
704.Wherein, memory 702 may include memory 7021, such as high-speed random access memory (Random-Access
Memory, RAM), it is also possible to it further include nonvolatile memory 7022 (non-volatile memory), for example, at least 1 magnetic
Disk storage etc.；Processor 701, network interface 704 and memory 702 can be connected with each other by internal bus 703, inside this
Bus 703 can be ISA (Industry Standard Architecture, industry standard architecture) bus, PCI
(Peripheral Component Interconnect, Peripheral Component Interconnect standard) bus or EISA (Extended
Industry StandardArchitecture, expanding the industrial standard structure) bus etc.；The internal bus 703 can be divided into
Address bus, data/address bus, control bus etc., only to be indicated with a four-headed arrow in Fig. 7 convenient for indicating, it is not intended that
Only a bus or a type of bus.Certainly, which is also possible that hardware required for other business.When
Processor 701 executes when executing instruction of the storage of memory 702, and processor 701 executes institute in any one embodiment of the invention
The method stated, and at least for executing the method described as shown in Figure 1, Figure 2.
In a kind of mode in the cards, processor reads corresponding execute instruction to interior from nonvolatile memory
It is then run in depositing, can also obtain from other equipment and execute instruction accordingly, to form a kind of photovoltaic battle array on logic level
The fault detection method of column.What processor execution memory was stored executes instruction, to execute instruction realization originally by what is executed
A kind of fault detection method of the photovoltaic array provided in invention any embodiment.
Processor may be a kind of IC chip, the processing capacity with signal.During realization, the above method
Each step can be completed by the instruction of the integrated logic circuit of the hardware in processor or software form.Above-mentioned processing
Device can be general processor, including central processing unit (Central Processing Unit, CPU), network processing unit
(Network Processor, NP) etc.；Can also be digital signal processor (Digital Signal Processor,
DSP), specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate
Array (Field-Programmable GateArray, FPGA) either other programmable logic device, discrete gate or crystal
Pipe logical device, discrete hardware components.It may be implemented or execute the disclosed each method in the embodiment of the present invention, step and patrol
Collect block diagram.General processor can be microprocessor or the processor is also possible to any conventional processor.
Claims (10)
1. a kind of fault detection method of photovoltaic array characterized by comprising
Acquire the current value of each group of string of photovoltaic array；
Determine the intermediate value and median absolute deviation estimator of each current value, and absolute according to the intermediate value and the intermediate value
Estimation of deviation amount determines upper limit current, lower current；
Dispersion ratio is determined according to each current value；
According to the upper limit current, the lower current and the dispersion ratio, determine whether each described current value is abnormal
Value；
When there are exceptional value described at least one, determine that corresponding group of string of each exceptional value breaks down.
2. the method according to claim 1, wherein
The intermediate value and median absolute deviation estimator of each current value of determination, and according to the intermediate value and the intermediate value
Absolute deviation estimator determines upper limit current, lower current, comprising:
Determine the intermediate value of each current value；
Median absolute deviation estimator is calculated by following first formula；Wherein,
First formula includes:
Wherein, S characterizes median absolute deviation estimator, xiCharacterize i-th of current value,Characterize intermediate value；
Lower current is calculated by following second formula；Wherein,
Second formula includes:
Wherein, IminCharacterize lower current, α be constant,Characterize intermediate value, S characterizes median absolute deviation estimator；
Pass through following third formula calculating upper limit electric current；Wherein,
The third formula includes:
Wherein, ImaxCharacterize upper limit current.
3. the method according to claim 1, wherein
It is described that dispersion ratio is determined according to each current value, comprising:
Calculate the mean value of each current value；
According to the standard deviation of each current value of the mean value computation；
The ratio of the standard deviation and the mean value is determined as dispersion ratio.
4. method according to any one of claims 1 to 3, which is characterized in that
It is described according to the upper limit current, the lower current and the dispersion ratio, determine each described current value whether be
Exceptional value, comprising:
A1, the current value for selecting a unselected mistake；
Whether A2, the detection current value are located between the lower current and the upper limit current, if otherwise executing A3, such as
Fruit is to execute A5；
Whether A3, the detection dispersion ratio are more than preset threshold, A4 are if it is executed, if otherwise executing A5；
A4, the current value is determined as to exceptional value, executes A5；
A5, the current value there are unselected mistake is detected whether, if it is, executing A1.
5. a kind of fault detection means of photovoltaic array characterized by comprising
Data acquisition module, the current value of each group of string for acquiring photovoltaic array；
Section determining module, for determining the intermediate value and median absolute deviation estimator of each current value, and according to described
Intermediate value and the median absolute deviation estimator determine upper limit current, lower current；
Dispersion ratio determining module, for determining dispersion ratio according to each current value；
Detection module, for determining each described electric current according to the upper limit current, the lower current and the dispersion ratio
Whether value is exceptional value；
Fault determination module, for determining that each exceptional value is corresponding when there are exceptional value described at least one
Group string breaks down.
6. device according to claim 5, which is characterized in that
The section determining module, comprising: median determining unit, the first computing unit, the second computing unit and third calculate single
Member；Wherein,
The median determining unit, for determining the intermediate value of each current value；
First computing unit, for calculating median absolute deviation estimator by following first formula；Wherein,
First formula includes:
Wherein, S characterizes median absolute deviation estimator, xiCharacterize i-th of current value,Characterize intermediate value；
Second computing unit, for calculating lower current by following second formula；Wherein,
Second formula includes:
Wherein, IminCharacterize lower current, α be constant,Characterize intermediate value, S characterizes median absolute deviation estimator；
The third computing unit, for passing through following third formula calculating upper limit electric current；Wherein,
The third formula includes:
Wherein, ImaxCharacterize upper limit current.
7. device according to claim 5, which is characterized in that
The dispersion ratio determining module, comprising: average calculation unit, standard deviation computing unit and dispersion ratio determination unit；Wherein,
The average calculation unit, for calculating the mean value of each current value；
The standard deviation computing unit, for the standard deviation according to each current value of the mean value computation；
The dispersion ratio determination unit, for the ratio of the standard deviation and the mean value to be determined as dispersion ratio.
8. according to the device any in claim 5 to 7, which is characterized in that
The detection module, comprising: selecting unit, section detection unit, dispersion ratio detection unit, exceptional value determination unit and inspection
Survey unit；Wherein,
The selecting unit, for selecting the current value of a unselected mistake；
The section detection unit, for detect the current value whether be located at the lower current and the upper limit current it
Between, the detection unit is if it is triggered, if otherwise triggering the dispersion ratio detection unit；
The dispersion ratio detection unit, for detecting whether the dispersion ratio is more than pre- under the triggering of the section detection unit
If threshold value, the exceptional value determination unit is if it is triggered, if otherwise triggering the detection unit；
The exceptional value determination unit for the current value to be determined as exceptional value, and triggers the detection unit；
The detection unit, for detecting whether there are the current values of unselected mistake, if it is, triggering the selection
Unit.
It is described when executing instruction described in the processor of electronic equipment executes 9. a kind of readable medium, including including executing instruction
Electronic equipment executes the method as described in any in Claims 1-4.
10. a kind of electronic equipment including processor and is stored with the memory executed instruction, described in processor execution
When executing instruction described in memory storage, the processor executes the method as described in any in Claims 1-4.
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Application publication date: 20191115 |