CN104779912B - The work state monitoring method of a kind of solar photovoltaic power plant and system - Google Patents
The work state monitoring method of a kind of solar photovoltaic power plant and system Download PDFInfo
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- CN104779912B CN104779912B CN201510209484.5A CN201510209484A CN104779912B CN 104779912 B CN104779912 B CN 104779912B CN 201510209484 A CN201510209484 A CN 201510209484A CN 104779912 B CN104779912 B CN 104779912B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008859 change Effects 0.000 claims abstract description 127
- 230000002159 abnormal effect Effects 0.000 claims abstract description 59
- 238000001514 detection method Methods 0.000 claims description 19
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- 238000000518 rheometry Methods 0.000 claims description 8
- 238000012795 verification Methods 0.000 abstract description 10
- 238000007689 inspection Methods 0.000 abstract description 3
- 238000013083 solar photovoltaic technology Methods 0.000 abstract description 2
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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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 present invention discloses work state monitoring method and the system of a kind of solar photovoltaic power plant, belongs to solar photovoltaic technology field.The method and system of the present invention by current changing rate and the verification of the ratio of intensity of sunshine rate of change, the verification of current value of adjacent or close input, adjacent or close input current changing rate follow factor check, adjacent or close input current changing rate do not follow inspection of quantity, determining that the duty of solaode string or the upper level header box being connected with input is the most abnormal, monitoring accuracy is high.
Description
Technical field
The present invention relates to solar photovoltaic technology field, particularly to the work of a kind of solar photovoltaic power plant
Make state monitoring method and system.
Background technology
The line between solar-energy photo-voltaic cell array and inverter in solar photovoltaic power plant is various, line
Path loss consumption is big, and the solar panel used in the industry is of a great variety, component parameter aspect difference
Very big, for different designs scheme, the inverter of multi-form also can be used, so that should in reality
By the middle difference according to project, the arrangement mode of photovoltaic array is varied.Based on photovoltaic array
In each group string operating characteristic differ greatly, be therefore difficult to single foundation component characteristic or arrangement mode to
The duty of solaode string (or being referred to as organizing string) delimited and determined numerical range, and this is just to solar energy
Monitoring and the fault diagnosis in real time of photovoltaic array bring huge difficulty.Owing to group string is solar photovoltaic
The basic Component units of pond array, and organize string the most normally work and will directly influence the safety of photovoltaic plant
And the gross generation of photovoltaic plant, therefore, the real-time current of each group of string is monitored and fault is examined
Break and be just particularly important.
In prior art, conventional monitoring system mainly realizes the electric quantity signal to solar photovoltaic power plant
Remotely monitoring, specifically, simply shows the different pieces of information of electric quantity signal at the same window, and
Will not directly be contrasted result；Also part monitoring system is had can to come according to the current changing rate in group string
The working condition of photovoltaic plant is monitored, but when this kind of monitoring system interference occurs in the external world, such as
When solaode string is blocked by object or the cloud sailed blocks, it is easily caused monitoring knot
There is mistake in fruit.
Summary of the invention
Embodiments provide work state monitoring method and the system of a kind of solar photovoltaic power plant, have
Effect improves monitoring accuracy.
The technical scheme that the embodiment of the present invention provides is as follows:
On the one hand, it is provided that the work state monitoring method of a kind of solar photovoltaic power plant, described solar energy
Overhead utility includes at least one solar-energy photo-voltaic cell array, and described solar-energy photo-voltaic cell array includes multiple
Solaode string and there is multiple input and the header box of an outfan, each described header box defeated
Entering end to be connected with the outfan of a solaode string or upper level header box, described method includes:
Detect the current value of each input in real time, and according to described current value calculating current rate of change,；
Detect the intensity of sunshine of each input in real time, and calculate intensity of sunshine change according to described intensity of sunshine
Rate；
Calculate the ratio of described current changing rate and described intensity of sunshine rate of change；
Judge described ratio whether in predetermined threshold value interval, if it is not, then determine and be connected with described input
Solaode string or the duty of upper level header box abnormal, otherwise carry out next step and judge；
Judge whether that the current value of all adjacent or close input of described header box is all less than
One preset value, if it is, determine that the solaode string being connected with described input or upper level converge
The duty of stream case is normal, otherwise enters next step and judges；
Judge whether that the current value of certain input is adjacent or close less than or equal to the second preset value
The current value of other inputs one or more is more than or equal to the first preset value, and wherein said first presets
Value more than described second preset value, if it is, determine solaode string that this input connects or
Upper level header box is in abnormal operation, otherwise calculate described input current changing rate and with institute
State the ratio of the current changing rate of the adjacent or close input of input and enter next step judgement；
Judge current changing rate and the electricity of the input adjacent or close with described input of described input
Whether the ratio of rheology rate is more than the current following variation coefficient preset, if it is, determine with described
Solaode string or upper level header box duty that input is connected are abnormal, otherwise statistics with
In the input that described input is adjacent or close current following variation coefficient more than described default electric current with
With the input quantity of variation coefficient, if described input quantity is less than the 3rd preset value, it is determined that with institute
The duty stating the connected solaode string of input or upper level header box is abnormal.
Preferably, if current following variation coefficient is more than in the input adjacent or close with described input
The input quantity of described default current following variation coefficient is not less than the 3rd preset value, it is determined that with institute
The duty stating the connected solaode string of input or upper level header box is normal.
Preferably, the solaode string or the work of upper level header box being connected with described input is being determined
After abnormal state, described method also includes: send corresponding alarm signal according to abnormal class.
Preferably, send corresponding alarm signal according to abnormal class, including: by the electric current of described input
Value compares with null value alarm threshold, lower current limit threshold value and upper current limit threshold value respectively, under described electric current
Limit threshold value is more than described null value alarm threshold and less than described upper current limit threshold value；
If the current value of described input is less than described null value alarm threshold, it is determined that described duty
Abnormal class is that null value is reported to the police, and sends null value alarm signal；
If the current value of described input is more than described null value alarm threshold and less than described lower current limit threshold
Value, it is determined that the abnormal class of described duty is that electric current low value is out-of-limit, and sends the out-of-limit report of electric current low value
Alert signal；
If the current value of described input is more than described upper current limit threshold value, it is determined that described duty
Abnormal class is that electric current high level is out-of-limit, and sends electric current high level off-limit alarm signal.
Preferably, if the ratio of described current changing rate and described intensity of sunshine rate of change is positive number, then sentence
Whether disconnected described current changing rate is less than the first predetermined threshold value with the ratio of described intensity of sunshine rate of change, if
It is then to judge that the ratio of described current changing rate and described intensity of sunshine rate of change is in predetermined threshold value interval；
If described current changing rate is negative with the ratio of described intensity of sunshine rate of change, then judge that described electric current becomes
Whether rate is more than the second predetermined threshold value, if it is, judge institute with the ratio of described intensity of sunshine rate of change
State the ratio of current changing rate and described intensity of sunshine rate of change in predetermined threshold value interval；Wherein said first
Predetermined threshold value is positive number, and described second predetermined threshold value is negative.
On the other hand, it is provided that the working state monitoring system of a kind of solar photovoltaic power plant, described solar energy
Photovoltaic plant includes at least one solar-energy photo-voltaic cell array, and described solar-energy photo-voltaic cell array includes many
Individual solaode string and there is multiple input and the header box of an outfan, each described header box
The outfan of input and a solaode string or upper level header box is connected, and described system includes:
Current detection module, for the current value of each input of detection in real time；
First computing module, for according to described current value calculating current rate of change；
Intensity of sunshine detection module, for the intensity of sunshine of each input of detection in real time；
Second computing module, for calculating intensity of sunshine rate of change according to described intensity of sunshine；
3rd computing module, for calculating the ratio of described current changing rate and described intensity of sunshine rate of change；
Comparison module, for respectively by the ratio of described current changing rate and described intensity of sunshine rate of change with pre-
If threshold interval compares, or by the current value of described input and the first preset value or the second preset value ratio
Relatively, or by the current changing rate of described input and the electricity of the input adjacent or close with described input
The ratio of rheology rate with preset current following variation coefficient compare, or will adjacent with described input or
In close input, current following variation coefficient is more than the input of described default current following variation coefficient
Terminal number amount compares with the 3rd preset value, and wherein said first preset value is more than described second preset value；
First judge module, for judging that described current changing rate with the ratio of described intensity of sunshine rate of change is
No in predetermined threshold value interval；
Second judge module, for when described first judge module judged result is for being, determine whether be
The current value of no all adjacent or close inputs is all less than the first preset value；
3rd judge module, for when described second judge module judged result is no, determine whether be
The electricity of the input that the current value of no existence input is the most adjacent or close less than or equal to the second preset value
Flow valuve is more than or equal to the first preset value；
4th computing module, for when described 3rd judge module judged result is no, calculates described input
The current changing rate of end and the ratio of the current changing rate of the input adjacent or close with described input；
4th judge module, for when described 3rd judge module judged result is no, determines whether institute
State the current changing rate of input and the current changing rate of the input adjacent or close with described input
Whether ratio is more than the current following variation coefficient preset；
Statistical module, adds up current following variation coefficient in the input adjacent or close with described input big
Input quantity in default current following variation coefficient；
5th judge module, for judging that the described input quantity that described statistical module counts obtains is the least
In the 3rd preset value；
Determine module, for according to described first judge module, described second judge module, the described 3rd sentence
Disconnected module and described 4th judge module, the judged result of described 5th judge module determine and described input
The solaode string being connected or the duty of upper level header box are the most abnormal.
Preferably, said system also includes alarm module of classifying, for being connected with described input determining
After the duty of solaode string or upper level header box is abnormal, send accordingly according to described abnormal class
Alarm signal.
Preferably, described classification alarm module includes:
Comparing unit, for by the current value of described input respectively with null value alarm threshold, lower current limit threshold
Value and upper current limit threshold value compare, and described lower current limit threshold value is more than described null value alarm threshold and little
In described upper current limit threshold value；
Classification alarm unit, is used for when the current value of described input is less than described null value alarm threshold, really
The abnormal class of fixed described duty is that null value is reported to the police, and sends null value alarm signal；At described input
Current value more than described null value alarm threshold and less than described lower current limit threshold value time, determine described work
The abnormal class of state is that electric current low value is out-of-limit, and sends electric current low value off-limit alarm signal；In described input
When the current value of end is more than described upper current limit threshold value, determine that the abnormal class of described duty is that electric current is high
It is worth out-of-limit, and sends electric current high level off-limit alarm signal.
Preferably, described first judge module includes:
First judging unit, for judging that described current changing rate with the ratio of described intensity of sunshine rate of change is
No for positive number；
Second judging unit, for judging described current changing rate and described sunshine at described first judging unit
After the ratio of change rate of strength is positive number, it is judged that the ratio of described current changing rate and described intensity of sunshine rate of change
Whether value is less than the first predetermined threshold value, if it is, judge that described current changing rate becomes with described intensity of sunshine
The ratio of rate is in predetermined threshold value interval；
Described second judging unit, is additionally operable to judge described current changing rate and institute at described first judging unit
State the ratio of intensity of sunshine rate of change not for after positive number, it is judged that described current changing rate becomes with described intensity of sunshine
Whether the ratio of rate is more than the second predetermined threshold value, if it is, judge described current changing rate and described day
According to the ratio of change rate of strength in predetermined threshold value interval；Described first predetermined threshold value is positive number, described second
Predetermined threshold value is negative.
The work state monitoring method of the solar photovoltaic power plant that the embodiment of the present invention provides and system, first root
The solaode string being connected with this input is determined according to the ratio of current changing rate with intensity of sunshine rate of change
Or the duty of upper level header box, if current changing rate exceedes pre-with the ratio of intensity of sunshine rate of change
If threshold interval, then prove the solaode string that connected of input or the power generation level of upper level header box
Not Tong Bu with environmental condition change, rather than the curent change that environmental factors causes is necessarily for solaode string
Or the short circuit of upper level header box itself or open circuit cause, thus it is different to detected open circuit or short circuit etc.
Often duty；And under conditions of the electric current change Tong Bu with intensity of sunshine of input, if all adjacent
Or the current value of close input all less than the first preset value time be identified as shadow occlusion, still judge
Duty is normal, and if the current value of certain input to be in a low-level the most adjacent or close
The current value of input high-level more than one time, although the electric current of these inputs is all strong with sunshine
Degree occurs to synchronize change, but owing to power generation level gap is excessive, and determine the input being in reduced levels
Solaode string or upper level header box that end connects break down；If the current value of input is complete
Portion is in high level state, or is partially in high level state, is partially in the low of " can accept "
Level, the most further by current following variation coefficient, check the electric current of input whether with
With the curent change of adjacent or close input, if not following change, it is determined that input connects
Solaode string or upper level header box break down, if following change, it is determined that verification base
Plinth, utilizes the variation coefficient of following of adjacent or close input (i.e. not follow change beyond the quantity of preset value
The input quantity changed) judge the solaode string or the work of upper level header box that are connected with this input
Make state.So by the generation current data detected in real time and the intensity of sunshine data that ambient conditions can be reflected
Combine and be monitored, and utilize the mutually verification of the current value of adjacent or close input, adjacent or close
The mutual verification of the current changing rate of input, it is possible to reduce dependence and external interference to historical data and draw
The erroneous judgement risen, thus it is effectively improved monitoring accuracy.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only
Some embodiments described in the present invention, for those of ordinary skill in the art, it is also possible to according to these
Accompanying drawing obtains other accompanying drawing.
Fig. 1 is the structural representation of a kind of solar photovoltaic power plant that the embodiment of the present invention provides；
Fig. 2 is the work state monitoring method of a kind of solar photovoltaic power plant that the embodiment of the present invention provides
Flow chart；
Fig. 3 is the working state monitoring system of a kind of solar photovoltaic power plant that the embodiment of the present invention provides
Structural representation.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that the scheme of the embodiment of the present invention, below in conjunction with the accompanying drawings
With embodiment, the embodiment of the present invention is described in further detail.
As it is shown in figure 1, a part for a kind of solar photo-voltaic power generation station provided for the embodiment of the present invention,
I.e. illustrate only two-stage to conflux the part of photovoltaic array of composition, in actual applications, this photovoltaic battle array
Row can continue to increase and conflux rank.In the present embodiment, in photovoltaic array, assembly connecting mode is: x
(x >=1) solar panel one solaode string of composition, employing n enters the one-level of 1 and confluxes,
Will be carried out by input 1 to the input n of same one-level header box by n solaode string
Conflux, use m to enter two grades of 1 more simultaneously and conflux, will the outfan of m one-level header box export
Electric current confluxed by input 1 to the input m of same two grades of header boxs, finally unify
Exported by the outfan of two grades of header boxs.I represents the current value of header box each input input.I represents
The output current value of header box outfan.N represents the maximum solar-electricity that one-level header box can access
Pond string quantity, as being 8 to enter 1 one-level header box, be up to 8 inputs for model, at most may be used
Accessing 8 solaode strings, one-level header boxs different when actually used can when exact arrangement
Actual can access solaode string quantity different, as Z1-H1 header box reality be only connected to 7 defeated
Entering end and connect solaode string, there are 6 input solaodes Z1-H2 header box actual connection
String.M represents two grades of header boxs and is connect the maximum branch road quantity that can access, as being 10 to enter 1 for model
Two grades of header boxs, be up to 10 inputs, at most can connect the outfan of 10 one-level header boxs.
If one-level header box is 8 models entering, then this 10 enter 1 two grades of each inputs of header box
Electric current will be the output of an one-level header box, be the sum of 8 solaode string electric currents, whole
The output electric current of two grades of header boxs is preferably at most the sum of 80 solaode string electric currents.When actually used
The solaode string quantity difference that two grades of different header boxs may actual access when exact arrangement,
As Z1 header box reality is only connected to 9 one-level header boxs, the input 1 of Z1 header box meets Z1-H1
The outfan of number header box, the input 2 of Z1 header box connects the outfan of Z1-H2 header box, depends on
Secondary analogize.Or, Z1 header box, in addition to connection has one-level header box, there is also and is directly connected to solar energy
The input of battery strings.It is to say, for one-level header box Z1-H1 to Z1-Hm, one-level is confluxed
In n input of case, multiple or fully enter end and contact with solaode and connect, and allow one
There is vacant input in level header box；And for two grades of header box Z1, an at least input
It is connected other input to connect with solaode series winding with the outfan of one-level header box, or such as
Two grades of header boxs shown in Fig. 1 all input 1 to input m respectively with one-level header box
Z1-H1 to Z1-Hm connects, and allows to there is vacant input.The header box of higher level is successively
Analogize until N level (N is integer and N >=2).
Each subcircuits of header boxs at different levels in the photovoltaic array that in the present embodiment, solar power station is used
There is a following relation:
1, for one-level header box: as a example by Z1-H1 header box, the electric current of its outfan and input
The current value of end has following relation: IZI-H1=i11+i12+…+i1n.Z1-H1 header box has n input
End, each input only connects a string solaode string, then the current value of its each input is exactly
The electric current of connect solaode string, it may be assumed that iInput 1=i11。
2, for two grades of header boxs: as a example by Z1 header box, the current value of its outfan and input
The current value of end has following relation: IZI=i1+i2+…+im.Wherein, i1It is the defeated of two grades of header box Z1
Enter the input current value of end 1, the output electricity of this current value outfan equal to one-level header box Z1-H1
Flow valuve IZI-H1, i2To imThe like.Z1 header box has m input, each input to connect
Connect an one-level header box, then the current value of each input of two grades of header box Z1 is exactly each to be connected
The current value of the outfan of the one-level header box connect, actually n solaode string current value
With, it may be assumed that the i of two grades of header boxsInput 1=i1=IZI-H1=i11+i12+…+i1n,
iInput m=im=IZI-Hm=im1+im2+…+imn.And if Z1 header box had both existed and had been directly connected to solar energy
The input of battery strings, there is also the input connecting one-level header box, the then output of Z1 header box
The current value of end is equal to the current value of solaode string directly connected and each one-level header box
The current value sum of outfan.
For the header box of the higher level of N ＞ 2, calculation the like, the most no longer describe in detail.
The electric current of the outfan of N level header box, through the access grid-connected point of inverter, enters power supply grid.
In the case of header box normally works, easily detect the current value of each input of header box,
Owing to the outfan of each input and a solaode string or higher level's header box is connected, therefore, each
The current value reality of input is also to flow through the solaode string or higher level's header box being connected with this header box
Current value.
Owing to solaode is the basic Component units of solar photovoltaic power plant, by multiple solaode strings
A solaode string, for different solar photovoltaic power plants, photovoltaic array is constituted after connection
Arrangement mode there may be relatively big difference, owing to the quantity of solar-energy photo-voltaic cell string is more, can use one
The generated energy of solaode string is confluxed by individual or multiple header boxs, thus it is guaranteed that each solar-electricity
Pond string and header box can normally work and be to ensure that the premise that solar photovoltaic power plant normally works.
In embodiments of the present invention, the input of " adjacent or close " refers to the solar-electricity connected
The input that pond is gone here and there or upper level header box physical location is adjacent or close, the most in FIG
Z1-H1 header box, although be separated by a plurality of input between input 1 and the input n of this header box,
If but the solaode string that the solaode string that connected of input 1 is connected with input n
Physical location is adjacent or close, then it represents that input 1 is adjacent with input n or close.Physical bit
Put adjacent or close solaode string or header box substantially experiences identical illumination condition and becomes
Change, experience the shadow occlusion process of building the most simultaneously or successively experience the moon of same building thing
Shadow blocks.
Embodiments provide the working state monitoring of a kind of solar photovoltaic power plant as shown in Figure 1
Method, wherein, solar photovoltaic power plant includes at least one solar-energy photo-voltaic cell array, photovoltaic
Array includes multiple solaode string and has multiple input and the header box of an outfan, often
The outfan of the input of individual header box and a solaode string or upper level header box is connected, this sun
The work state monitoring method of energy photovoltaic plant is as in figure 2 it is shown, comprise the following steps:
Step 101: detect the current value of each input in real time, and according to current value calculating current rate of change.
Wherein, current changing rate is the abbreviation of current value rate over time, detects the electricity in two moment respectively
After flow valuve, those skilled in the art easily calculate current changing rate.
Step 102: detect the intensity of sunshine of each input in real time, and it is strong to calculate sunshine according to intensity of sunshine
Degree rate of change.
Above-mentioned intensity of sunshine is also referred to as amplitude at sunshine, for certain solaode string, from t0Moment
Intensity of sunshine rate of change=(intensity of sunshine to t(t)-intensity of sunshine(t0))/intensity of sunshine(t0).Change
Rate can reflect the situation of change at sunshine in a period of time.By monitoring the intensity of sunshine of each input in real time
Data, can not only gather the most real environmental data, it is not necessary to reference to history gas phase data or purchase
Buy special gas phase data, effectively reduce purchase cost, and make present embodiment have higher can be real
Shi Xing.
Step 103: calculating current rate of change and the ratio of intensity of sunshine rate of change.Obtaining curent change
Step 201 is entered after rate, intensity of sunshine rate of change, current changing rate and the ratio of intensity of sunshine rate of change
And subsequent step.
Step 201: judge that current changing rate is the most interval in predetermined threshold value with the ratio of intensity of sunshine rate of change
In, if it is not, then solaode string or the generating shape of upper level header box that this input connects is described
State is asynchronous with intensity of sunshine change, enters step 206: determine the solaode string being connected with input
Or the duty of upper level header box is abnormal.If it is to say, current changing rate changes with intensity of sunshine
The ratio of rate exceedes predetermined threshold value (including that forward exceedes with negative sense more than two kinds of situations), it was demonstrated that the above-mentioned sun
The generating state of energy battery strings does not synchronizes to change along with the intensity of illumination of environment, and under normal circumstances, shadow
Ring the only environmental factors of the power generation level change of solaode string, now can interpolate that out that input connects
Solaode string or upper level header box fault.Such as, in solaode string, header box fault-free
State under, ideally the ratio of the current changing rate of input and intensity of sunshine rate of change should be 1,
In view of solaode string and the stability of header box, this ratio should close to 1 a threshold value
In interval, if intensity of sunshine rate of change is 1.2 (i.e. illumination condition gradually improves) in certain time period, and
The current changing rate of certain input reaches 1.5, hence it is evident that has exceeded the lifting speed of intensity of sunshine, now can
Determine the fault that there is short circuit, and the current changing rate of certain input is only 1.02, hence it is evident that less than intensity of sunshine
Lifting speed, now can determine the fault that there is open circuit.
Wherein, it is judged that whether current changing rate has with the ratio of intensity of sunshine rate of change in predetermined threshold value interval
Body includes:
Judge whether ratio is positive number, if it is, when ratio is less than the first predetermined threshold value, it is judged that ratio
In predetermined threshold value interval；Otherwise, when ratio is more than the second predetermined threshold value, it is judged that ratio is in predetermined threshold value
In interval；Wherein, the first predetermined threshold value is positive number, and the second predetermined threshold value is negative.
If the judged result of step 201 is yes, then illustrate that the current value of input is basic with intensity of sunshine
Synchronize change, such as, occur building effects to block or during darkness, owing to intensity of sunshine reduces,
Then the electric current of input is gradually lowered.But, the change synchronization with intensity of sunshine of this electric current is not intended to
And there is not fault, such as, in midnight's time-division, the generated energy of all solaode strings keeps the most substantially
It is zero, now has the single solar panels in solaode string or solaode string to there occurs open circuit, with
The arrival in early morning, illumination condition gradually improves, solaode string that this breaks down or header box
Curent change still with intensity of sunshine change Tong Bu.Therefore to detect fault further, in step 201
Judged result for being time, in addition it is also necessary to enter step 202 and subsequent step and detect further.
Step 202: judge whether that the current value of all adjacent or close input of header box is the least
In the first preset value.First preset value is greater than the second preset value described below.
In embodiments of the present invention, the input of " adjacent or close " refers to the solar-electricity connected
The input that pond is gone here and there or upper level header box physical location is adjacent or close, the most in FIG
Z1-H1 header box, although be separated by a plurality of input between input 1 and the input n of this header box,
If but the solaode string that the solaode string that connected of input 1 is connected with input n
Physical location is adjacent or close, then it represents that input 1 is adjacent with input n or close.Physical bit
Put adjacent or close solaode string or header box substantially experiences identical illumination condition and becomes
Change, experience the shadow occlusion process of building the most simultaneously or successively experience the moon of same building thing
Shadow blocks.
If the judged result of step 202 is yes, then illustrate that the current value now not having input reaches
Or the level (first predetermined value) higher more than, the solar energy that the most all inputs connect
Battery strings or header box be in one relatively low, even close to zero generating state.Due to all phases
Adjacent or close solaode string, header box occur the probability of open circuit fault minimum, now simultaneously
It is believed that causing all solaode strings can not normal power generation reason be that these are adjacent or close defeated
Enter the solaode string that end connects all to be blocked by shadow, or be completely in after the sun sets black
Dark state, therefore enter step 207: determine solaode string that the input of this header box connects or
Upper level header box is in normal operating conditions, rather than malfunction, thus utilize adjacent or close
The mutually verification of the current value of input eliminates fault misdescription.
If the judged result of step 202 is no, then enters step 203 and determine whether:
Judge whether the current value of certain input less than or equal to the second preset value adjacent or close
Or the current value of multiple other input is more than or equal to the first preset value.
If the judged result of step 203 is yes, then, in adjacent or close input, have is defeated
Enter end current value up to or over the first preset value, this moment a range of environment bar is described
Part has been able to meet good power generation requirements, and the current value that now there is input is pre-less than second
If value, then it is assumed that the current value of this input is the lowest even close to zero.Occur when environmental condition is good
Low-level generating state, then can interpolate that solaode string or upper level that this input connects
Header box is in abnormal operation.It is to say, in step 203, utilize adjacent or close defeated
Enter the mutual verification of the current value of end, have identified good environmental condition and detected and the defeated of exception occurs
Enter end, thus correctly inspection is out of order.
In the case of the judged result of step 203 is no, there are two kinds of situations:
The first situation: the current value of all inputs has reached a high level, i.e. more than the first predetermined value；
The second situation: the current value of the input having is in the low-level state of " can accept ", is i.e. in
Between first predetermined value and the second predetermined value, and the current value of other input has reached a high level.
The duty that above-mentioned two situations might not represent solaode string or header box is normal, example
As in the first case, it is possible to occur in that single part (such as two sun in solaode string
Can be between cell panel) short circuit, but the short circuit of little scope is also not enough to cause the electric current of the input of header box
Change is clearly present deviation with intensity of sunshine change；And in the second situation, it is possible to occur in that solar energy
There is open circuit in single part in battery strings, but this open circuit is also not enough to cause the electric current of the input of header box
Obvious deviation is there is in change with intensity of sunshine change.Therefore the situation being no in the judged result of step 203
Under, proceed step 204 and subsequent step judges.
Step 204: calculate current changing rate and the electricity of the input adjacent or close with input of input
The ratio of rheology rate, is referred to as current following variation coefficient at this by this ratio.
The most in step 204, if all inputs of one-level header box Z1-H1 are the most adjacent or close
If, then the current following variation coefficient of input 1 is i11/i12, or i11/i13Deng.
Step 205: judge current changing rate and the electricity of the input adjacent or close with input of input
Whether the ratio (that is, current following variation coefficient) of rheology rate is more than the current following variation coefficient preset,
If it is, enter step 206: determine the solaode string or upper level header box being connected with input
Duty abnormal；If it is not, then enter step 207: determine the solaode being connected with input
The duty of string or upper level header box is normal, or uses other detection method of the prior art to carry out
Detection further.
Become at the current changing rate of an input and the electric current of the input adjacent or close with this input
In the case of the ratio of rate is more than the current following variation coefficient preset, although the electric current of this input is described
Change is Tong Bu with intensity of sunshine change, and does not also find different after the inspection of current value and adjacent or close input
Often, but for comparing more adjacent or close input, the curent change of this input is more violent, this
Time just can determine have solaode string that the input of more violent current changing rate connected or
Person's upper level header box there occurs the failure exception such as open circuit or short circuit.Such as, one-level header box Z1-H1
There are 10 inputs and respectively connect the solar-electricity that a solaode string, only input 1 connect
Pond string there occurs short circuit, but the solaode string of this fault is connected to by one-level header box Z1-H1
After the input 1 of two grades of header box Z1, this input 1 of two grades of header box Z1 is owing to being also connected with 9
Individual normal solaode string, now the curent change of this input 1 of two grades of header box Z1 remains
Tong Bu with intensity of sunshine change (synchronizing to improve or reduce), but now two grades of these inputs of header box Z1
End 1 " does not follows " adjacent or close input 2, input 3 changes, therefore by adjacent or phase
The verification of the current changing rate of nearly input, detected that the input 1 of two grades of header box Z1 is connected one
The duty of level header box Z1-H1 is abnormal.If the both changes Tong Bu with intensity of sunshine of the electric current of input,
Followed the curent change of other adjacent or close input the most well, then explanation duty is normal.
When the judged result of step 205 is no, illustrate as judging that the input of object is with adjacent or close
Input create good curent change and follow.Now can enter using this input as a benchmark
The curent change of the input that one step pair is adjacent or close with this input carries out step 301 and subsequent treatment.
Step 301: statistics and described input (the most in step 205 as judging the input of object,
This input is as a benchmark) in adjacent or close input current following variation coefficient more than presetting
The input quantity of current following variation coefficient.Such as, through the judgement of step 205, one-level header box
The current changing rate of the input 4 of Z1-H1 and the ratio of intensity of sunshine rate of change are normal, input 4 and phase
Adjacent or close input 5, the current value difference of input 6 are normal, the current changing rate of input 4 with
Adjacent or close input 5, the ratio (i.e. current following variation coefficient) of the current changing rate of input 6
Normally, then using input 4 as a benchmark, calculate the input 1 adjacent or close with input 4,
(the i.e. current changing rate of input 5 and input such as the current following variation coefficient of input 5, input 6 etc.
The ratio of current changing rate of end 4, input 6 and the ratio etc. of the current changing rate of input 4) in big
In the quantity of default current following variation coefficient, input 5, input 6, input 7 electric current with
If being all higher than, with variation coefficient, the current following variation coefficient preset, then the input counted in step 301
Terminal number amount is 3.Visible, in step 301, " described input " refers in step 204 as sentencing
The input of disconnected object, and as the input of object of statistics in step 301, and as judging object
The input that input is adjacent or close.
After obtaining input quantity, enter step 302: judge whether input quantity is preset less than the 3rd
Value.If described input quantity is less than the 3rd preset value, then enter step 206: determine and input with these
Solaode string or the duty of upper level header box that end is connected are abnormal.Such as, the 3rd preset value is
4, and only the current following variation coefficient of input 5, input 6 and input 7 exceedes default electricity
Stream follows variation coefficient, illustrates to be mostly between the input of one-level header box Z1-H1 well to follow
State, and the solaode string that the best input of sub-fraction following state connects can be confirmed as different
Often.If input quantity more than the 3rd preset value, such as input 5, input 6 until input 15
All there is not well following of curent change, input quantity more than 4, now think this on a large scale the most not
Situation about well following is that environmental factors causes, and the most relatively thin cloud is sailed, the most all too
Sun battery strings can be in good generating state, but can not be well by the solaode string that cloud is inswept
Follow other solaode string and realize curent change, now enter step 207: determine that these inputs are even
The solaode string connect is in normal operating conditions.
In embodiments of the present invention, the solaode string or upper level header box being connected with input is being determined
Duty abnormal after, the work state monitoring method of above-mentioned solar photovoltaic power plant also includes alarming step
401: determine the abnormal class of duty, and send corresponding alarm signal according to abnormal class.Abnormal
Type includes current changing rate and intensity of sunshine rate of change synchronicity exception, the step judged in step 201
The electricity judged in the current value gap exception of the adjacent or close input judged in 203, step 205
The current changing rate judged in rheology followability exception or step 302 does not follows quantity exception etc..
The above-mentioned current value according to input determines the abnormal class of duty, and sends according to abnormal class
Corresponding alarm signal, mutually verifies exception, current following variation coefficient verification exception etc. except current value,
Also include:
Step S1: obtain input respectively at predetermined time and the current value of current time, calculating input
Current change quantity；
Step S2: by current change quantity respectively with upper current limit threshold value, lower current limit threshold ratio relatively, electric current
Upper limit threshold is more than lower current limit threshold value；
If current change quantity is more than upper current limit threshold value, and more than h times of predetermined time current value, h is big
In 0 and less than 1, then perform step S3: the abnormal class determining duty is that electric current high level is out-of-limit, and
Send electric current high level off-limit alarm signal；
If current change quantity is less than lower current limit threshold value, and less than l times of predetermined time current value, l is big
In 0 and less than 1, then perform step S4: the abnormal class determining duty is that electric current low value is out-of-limit, and
Send electric current low value off-limit alarm signal.
In one embodiment of the invention, the exception class of duty is determined according to the current value of input
Not, and send corresponding alarm signal according to abnormal class, also include:
Step S11: compared with null value alarm threshold by the current value of current time, null value alarm threshold is less than
Lower current limit threshold value；
If the current value of the current time of input is less than null value alarm threshold, then perform step S12: really
The abnormal class determining duty is that null value is reported to the police, and sends null value alarm signal.
In order to the embodiment of the present invention is described in detail, the most first provides the definition of several fundamental quantity, and tie
Close fundamental quantity further to a preferred embodiment of the present invention will be described in detail.
(1) input electric current: refer to the actual current value of each input of header box；
(2) warning remote signalling amount: carrying out internal calculation according to the analog signals gathered, output numeral is distant
Traffic (0 or 1), different digital remote signalling amounts represents different implications；
(3) whether null value is reported to the police: be zero according to input electric current, determines whether to send alarm signal,
" 0 " represents this input institute connected components and does not works, and 1 to represent this input institute connected components in running order,
Wherein, assembly mainly includes the solaode string being made up of multiple solaodes；
(4) electric current low value is out-of-limit: represent that input electric current is at current time generation current value by a relatively large margin
Reducing, " 0 " represents this input institute connected components electric current almost without changing, and is in normal operating conditions；
" 1 " represents this input institute connected components electric current and occurs to change by a relatively large margin, is in abnormal working position；
(5) electric current high level is out-of-limit: represent that input electric current is at current time generation current value by a relatively large margin
Increasing, " 0 " represents this input institute connected components electric current almost without changing, and is in normal operating conditions；
" 1 " represents this input institute connected components electric current and occurs to change by a relatively large margin, is in abnormal working position；
Report to the police null value individually below, electric current high level is out-of-limit and electric current low value is out-of-limit is described in detail:
(3) null value is reported to the police:
In embodiments of the present invention, by judging whether input current value is 0, it is possible to judge that input is
No normal work.If in same header box institute connected components, any one input the most stably exports generation current,
And some the input current value being under this header box is 0, then this current value be 0 input send
" null value warning ", thus remind this input end to there is fault.Some input due to same header box
Normal work, illustrates that weather condition possesses power generation conditions at that time, and the input electric current of now certain input
For " 0 ", illustrate that all solaode strings connect under this input do not generate electricity, belong to abnormal conditions, when
So its reason is varied, damages such as the protection fuse of group string series connection or in group string, certain assembly damages, or
This group of person is serially connected with problem etc., will discharge concrete fault, needs to detect assembly further.
Specifically the condition that null value is reported to the police can be set according to actual needs, work as input for example, it is possible to arrange
Condition when electric current meets following condition, sending " null value warning " signal (i.e. remote signalling amount set) is:
1, one adjustable null value warning initiation value virtual value q is set, when in same header box the most individual
When road electric current is more than q, null value warning function just comes into operation；
2, the one adjustable null value effective thresholding g of warning is set, when the electric current of any one group string input is little
When g, being considered as this branch current is 0, sends " null value warning ".
In embodiments of the present invention, owing under normal circumstances, photovoltaic module output is the most stable, the most fixing
Operating current, output electric current change with the change of irradiation (intensity of sunshine), it is generally the case that sun
The irradiation of light is steady and continuous change, and is affected by diffusion etc., transition will not occur, therefore, normally
In the case of, group string electric current the most stable, will not suddenly change, when faulty or damage time, its output electric current will send out
Raw significant change.Therefore, it can judge the most normal work of group string by detection group string real-time current variable quantity
Make.
Out-of-limit for (4) electric current low value:
Determine whether that input electric current occurs by comparing current value variable quantity within the time arranged
Sudden change exceedes normal limit, judges that group string the most normally works.If there being multichannel simultaneously in same header box
When there is the bigger transition of electric current, now think that the solaode string being connected with input or header box do not occur
Abnormal, and be probably object and blocked or cloud is sailed and caused, now, do not send abnormal alarm signal.
When input electric current meets following condition, send " electric current low value is out-of-limit " and report to the police, i.e. electric current low value
Out-of-limit remote signalling amount set (putting 1) condition is:
1, amplitude at sunshine is set and follows variation coefficient R1 calculation amplitude of variation rate at current sunshine, if amplitude at sunshine
Rate of change is negative value, and sunshine, amplitude of variation rate exceeded institute with the absolute value of the ratio of input current changing rate
The amplitude at sunshine arranged follows variation coefficient, then the out-of-limit coefficient of electric current high level puts 1；In conjunction with (4) and (5)
In sunshine amplitude of variation coefficient understand, when ratio is not in predetermined threshold value interval, it is determined that with input phase
The duty of solaode string even or upper level header box is abnormal, according to amplitude change rate at sunshine just
Bear and can be determined that low value is out-of-limit or high level is out-of-limit.
2, genetic coefficient S (integer represents input comparison range around) simultaneously it is set, it is defeated that comparison is set
Enter end and follow variation coefficient B1, calculate the ratio of other input current changing rates around this input,
When this ratio exceed set input follow variation coefficient time, the out-of-limit coefficient of electric current high level puts 1.
Electric current low value out-of-limit coefficient l (also becoming lower current limit threshold value) 3, is set: i.e. input curent change
When amount is less than l times of electric current, sends " electric current low value is out-of-limit " and report to the police.
As (in(0)-in(t))<Imin=lin(0), export electric current low value off-limit alarm；Wherein, l is electric current low value limit
Coefficient processed, l ∈ (0,1), this variable can pass through background maintenance software design patterns, with monitoring backstage real-time Communication for Power, n
For integer, representing certain loop in header box, n is fan-in to the maximum, and t is certain loop, timer
Time, this variable can pass through background maintenance software design patterns, and range of accommodation carries out different setting according to disparity items.
Out-of-limit for (5) electric current high level:
Determine whether that input electric current occurs by comparing current value variable quantity within the time arranged
Sudden change, exceedes normal limit, judges that group string the most normally works.
When input electric current meets following condition, send " electric current high level is out-of-limit " and report to the police, i.e. electric current high level
Out-of-limit remote signalling amount puts the condition of 1:
1, calculate amplitude of variation rate at current sunshine, if amplitude of variation rate at sunshine be on the occasion of, and sunshine, amplitude became
The absolute value of the ratio of rate and input current changing rate exceedes set amplitude at sunshine and follows change system
Number R2, then the out-of-limit coefficient of electric current high level puts 1；
2, arrange and compare input and follow variation coefficient B2, calculate other inputs electricity around this input
The ratio of rheology rate, when this ratio exceed set input follow variation coefficient time, electric current low value is more
Limit coefficient puts 1.
The out-of-limit coefficient h of electric current high level (also referred to as upper current limit threshold value) 3, is set: i.e. input curent change
When amount is higher than h times of electric current, outputting alarm remote signalling.
As (in(t)-in(0))>Imax=hin(0), output off current HIGH value Threshold Crossing Alert remote signalling, wherein, h is that electric current is high
Value limit coefficient, h ∈ (0,1), this variable can pass through background maintenance software design patterns, have read-write window, Ke Yitong
Crossing 485 order wires to be directly downloaded in equipment, without programming program again, n is integer, and representative is confluxed
Certain loop in case, n is actual circuitry number to the maximum, and t is certain loop, timer periods, and this variable can
By background maintenance software design patterns, range of accommodation carries out different setting according to disparity items.
The work state monitoring method of the solar photovoltaic power plant that the embodiment of the present invention provides, first according to electric current
Rate of change determines the solaode string being connected with this input or upper with the ratio of intensity of sunshine rate of change
The duty of level header box, if the ratio of current changing rate and intensity of sunshine rate of change exceedes predetermined threshold value
Interval, then prove the power generation level of the solaode string that connected of input or upper level header box not with
Environmental condition synchronizes change, rather than the curent change that causes of environmental factors necessarily for solaode string or on
Short circuit or the open circuit of one-level header box itself cause, thus detected the abnormal work such as open circuit or short circuit
State；And under conditions of the electric current change Tong Bu with intensity of sunshine of input, if all adjacent or close
The current value of input all less than the first preset value time be identified as shadow occlusion, still judge work shape
State is normal, and if the current value of certain input is in a most adjacent or close input of low-level
When the current value of end is high-level more than one, although the electric current of these inputs all occurs with intensity of sunshine
Synchronize change, but owing to power generation level gap is excessive, and determine that the input being in reduced levels connects
Solaode string or upper level header box break down；If the current value of input is completely in
High level state, or it is partially in high level state, it is partially in the low-level shape of " can accept "
State, the most further by current following variation coefficient, checks whether the electric current of input follows adjacent
Or the curent change of close input, if not following change, it is determined that the solar energy that input connects
Battery strings or upper level header box break down, if following change, with current following variation coefficient just
Normal input is as benchmark, the number abnormal to adjacent or close input generation current following variation coefficient
Amount compares, if the most well followed only on a small quantity, the most directly determines exception, if a large amount of input is the most not
Well follow, then judge that this phenomenon producing cause is such environmental effects, determine normal.Such as cloud
The solaode string that shade is inswept, portion's packet chain leaves shadow occlusion and portion's packet chain is not left shade and hidden
Gear, then, for the group string not leaving shadow occlusion, have a number of solar energy leaving and blocking
Battery strings " follows " curent change not leaving the solaode string blocked the most well, but these groups
String remains normal.Due to by the generation current detected in real time data and the sunshine that ambient conditions can be reflected
Intensity data combines and is monitored, and utilizes the multiple mutual verification of adjacent close input, it is possible to reduce
The erroneous judgement that dependence and the external interference of historical data are caused, thus it is effectively improved monitoring accuracy.
Correspondingly, the embodiment of the present invention additionally provides the working state monitoring system of a kind of solar photovoltaic power plant
System, as it is shown on figure 3, solar photovoltaic power plant includes at least one solar-energy photo-voltaic cell array, solar energy
Photovoltaic battery array includes multiple solaode string and has confluxing of multiple input and an outfan
Case, the outfan of the input of each header box and a solaode string or upper level header box is connected,
Described system includes:
Current detection module 501, for the current value of each input of detection in real time；
First computing module 502, becomes for the current value calculating current obtained according to current detection module 501
Rate；
Intensity of sunshine detection module 503, for the intensity of sunshine of each input of detection in real time；
Second computing module 504, calculates for the intensity of sunshine obtained according to intensity of sunshine detection module 503
Intensity of sunshine rate of change；
3rd computing module 505, for calculating the current changing rate and second that the first computing module 502 obtains
The ratio of the intensity of sunshine rate of change that computing module 504 obtains；
Comparison module 506 is strong with sunshine for the current changing rate obtained by the 3rd computing module 505 respectively
The ratio of degree rate of change compares with predetermined threshold value interval, or the input obtained by current detection module 501
Current value compare with the first preset value or the second preset value, or the 4th computing module 510 is obtained defeated
Enter end current changing rate and the input adjacent or close with this input current changing rate ratio with
The current following variation coefficient preset compares, or statistical module 512 is obtained adjacent with this input or
In close input, current following variation coefficient is more than the fan-in of the current following variation coefficient preset
Amount compares with the 3rd preset value, and wherein the first preset value is more than the second preset value；
First judge module 507, for judging current changing rate and the sunshine of the 3rd computing module 505 acquisition
Whether the ratio of change rate of strength is in predetermined threshold value interval；
Second judge module 508, for when the first judge module 507 judged result is for being, sentences further
The current value of the disconnected all adjacent or close input whether current detection module 501 obtains all less than
First preset value；
3rd judge module 509, for when the second judge module 508 judged result is no, sentences further
The disconnected current value that whether there is certain input is less than or equal to the input that the second preset value is the most adjacent or close
Current value more than or equal to the first preset value；
4th computing module 510, for when the 3rd judge module 509 judged result is no, calculates described
The current changing rate of input and the ratio of the current changing rate of the input adjacent or close with described input
Value (that is, current following variation coefficient)；
4th judge module 511, is used for when the 3rd judge module 509 judged result is no, and the 4th
After computing module 510 obtains ratio, determine whether described input current changing rate and with described input
The ratio (that is, current following variation coefficient) holding the current changing rate of adjacent or close input is the biggest
In default current following variation coefficient；
Statistical module 512, when the 4th judge module judged result is no, adds up adjacent with described input
Or current following variation coefficient is more than the input of the current following variation coefficient preset in close input
Quantity；
5th judge module 513, for judging that the input quantity that described statistical module 512 statistics obtains is
No it is less than the 3rd preset value；
Determine module 514, for according to described first judge module 507, described second judge module 508,
The judgement knot of described 3rd judge module 509 and described 4th judge module the 511, the 5th judge module 513
Fruit determines that the duty of solaode string or the upper level header box being connected with described input is the most different
Often.
As the presently preferred embodiments, said system also includes alarm module 515 of classifying, for determining module 514
After determining the duty exception of solaode string or the upper level header box being connected with described input, root
Corresponding alarm signal is sent according to abnormal class.
Classification alarm module 515 includes:
Comparing unit 516, for by the current value of described input respectively with under null value alarm threshold, electric current
Limit threshold value and upper current limit threshold value compare, described lower current limit threshold value more than described null value alarm threshold,
And less than described upper current limit threshold value；
Classification alarm unit 517, for the current value at described input less than described null value alarm threshold
Time, determine that the abnormal class of described duty is that null value is reported to the police, and send null value alarm signal；Described
When the current value of input is more than described null value alarm threshold and less than described lower current limit threshold value, determine institute
The abnormal class stating duty is that electric current low value is out-of-limit, and sends electric current low value off-limit alarm signal；Institute
When stating the current value of input more than described upper current limit threshold value, determine that the abnormal class of described duty is
Electric current high level is out-of-limit, and sends electric current high level off-limit alarm signal.
As the presently preferred embodiments, the first judge module 507 includes:
First judging unit, for judging that described current changing rate with the ratio of described intensity of sunshine rate of change is
No for positive number；
Second judging unit, for judging described current changing rate and described sunshine at described first judging unit
After the ratio of change rate of strength is positive number, it is judged that the ratio of described current changing rate and described intensity of sunshine rate of change
Whether value is less than the first predetermined threshold value, if it is, judge that described current changing rate becomes with described intensity of sunshine
The ratio of rate is in predetermined threshold value interval；
Described second judging unit, is additionally operable to judge described current changing rate and institute at described first judging unit
State the ratio of intensity of sunshine rate of change not for after positive number, it is judged that described current changing rate becomes with described intensity of sunshine
Whether the ratio of rate is more than the second predetermined threshold value, if it is, judge described current changing rate and described day
According to the ratio of change rate of strength in predetermined threshold value interval；Described first predetermined threshold value is positive number, described second
Predetermined threshold value is negative.
The working state monitoring system of the solar photovoltaic power plant that the embodiment of the present invention provides, owing to achieving figure
Method in 2 and the dependence to historical data can be reduced and erroneous judgement that external interference causes, thus effectively
Improve monitoring accuracy.
Each embodiment in this specification all uses the mode gone forward one by one to describe, phase homophase between each embodiment
As part see mutually, what each embodiment stressed is different from other embodiments it
Place.For system embodiment, owing to it is substantially similar to embodiment of the method, so describing
Fairly simple, relevant part sees the part of embodiment of the method and illustrates.System described above is implemented
Example is only that schematically the wherein said module illustrated as separating component or unit can be or also may be used
Not to be physically separate, the parts shown as unit can be or may not be physical location,
I.e. may be located at a place, or can also be distributed on multiple unit.Can select according to the actual needs
Select some or all of module therein to realize the purpose of the present embodiment scheme.Those of ordinary skill in the art
In the case of not paying creative work, i.e. it is appreciated that and implements.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all the present invention's
Within spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included in the present invention's
Within protection domain.
Claims (9)
1. a work state monitoring method for solar photovoltaic power plant, described solar photovoltaic power plant includes
At least one solar-energy photo-voltaic cell array, described solar-energy photo-voltaic cell array includes multiple solaode
Go here and there and there is multiple input and the header box of an outfan, the input of each described header box and one
The outfan of solaode string or upper level header box is connected, it is characterised in that described method includes:
Detect the current value of each input in real time, and according to described current value calculating current rate of change；
Detect the intensity of sunshine of each input in real time, and calculate intensity of sunshine change according to described intensity of sunshine
Rate；
Calculate the ratio of described current changing rate and described intensity of sunshine rate of change；
Judge described ratio whether in predetermined threshold value interval, if it is not, then determine and be connected with described input
Solaode string or the duty of upper level header box abnormal, otherwise carry out next step and judge；
Judge whether that the current value of all adjacent or close input of described header box is all less than
One preset value, if it is, determine that the solaode string being connected with described input or upper level converge
The duty of stream case is normal, otherwise enters next step and judges；
Judge whether that the current value of certain input is adjacent or close less than or equal to the second preset value
The current value of other inputs one or more is more than or equal to the first preset value, and wherein said first presets
Value more than described second preset value, if it is, determine solaode string that this input connects or
Upper level header box is in abnormal operation, otherwise calculate described input current changing rate and with institute
State the ratio of the current changing rate of the adjacent or close input of input and enter next step judgement；
Judge current changing rate and the electricity of the input adjacent or close with described input of described input
Whether the ratio of rheology rate is more than the current following variation coefficient preset, if it is, determine with described
Solaode string or upper level header box duty that input is connected are abnormal, otherwise statistics with
In the input that described input is adjacent or close current following variation coefficient more than described default electric current with
With the input quantity of variation coefficient, if described input quantity is less than the 3rd preset value, it is determined that with institute
The duty stating the connected solaode string of input or upper level header box is abnormal.
The work state monitoring method of solar photovoltaic power plant the most according to claim 1, its feature
It is, if current following variation coefficient is more than described pre-in the input adjacent or close with described input
If the input quantity of current following variation coefficient not less than the 3rd preset value, it is determined that with described input
Solaode string or the duty of upper level header box that end is connected are normal.
The work state monitoring method of solar photovoltaic power plant the most according to claim 1, its feature
It is, different in the duty determining solaode string or the upper level header box being connected with described input
Chang Hou, described method also includes: send corresponding alarm signal according to abnormal class.
The work state monitoring method of solar photovoltaic power plant the most according to claim 3, its feature
It is, sends corresponding alarm signal according to abnormal class, including: by the current value of described input respectively
Compare with null value alarm threshold, lower current limit threshold value and upper current limit threshold value, described lower current limit threshold value
More than described null value alarm threshold and less than described upper current limit threshold value；
If the current value of described input is less than described null value alarm threshold, it is determined that described duty
Abnormal class is that null value is reported to the police, and sends null value alarm signal；
If the current value of described input is more than described null value alarm threshold and less than described lower current limit threshold
Value, it is determined that the abnormal class of described duty is that electric current low value is out-of-limit, and sends the out-of-limit report of electric current low value
Alert signal；
If the current value of described input is more than described upper current limit threshold value, it is determined that described duty
Abnormal class is that electric current high level is out-of-limit, and sends electric current high level off-limit alarm signal.
The work state monitoring method of solar photovoltaic power plant the most according to claim 1, its feature
It is, if the ratio of described current changing rate and described intensity of sunshine rate of change is positive number, then judges described
Whether current changing rate is less than the first predetermined threshold value with the ratio of described intensity of sunshine rate of change, if it is,
Judge that the ratio of described current changing rate and described intensity of sunshine rate of change is in predetermined threshold value interval；If institute
The ratio stating current changing rate and described intensity of sunshine rate of change is negative, then judge described current changing rate with
Whether the ratio of described intensity of sunshine rate of change is more than the second predetermined threshold value, if it is, judge described electric current
The ratio of rate of change and described intensity of sunshine rate of change is in predetermined threshold value interval；Wherein said first presets threshold
Value is positive number, and described second predetermined threshold value is negative.
6. a working state monitoring system for solar photovoltaic power plant, described solar photovoltaic power plant includes
At least one solar-energy photo-voltaic cell array, described solar-energy photo-voltaic cell array includes multiple solaode
Go here and there and there is multiple input and the header box of an outfan, the input of each described header box and one
The outfan of solaode string or upper level header box is connected, it is characterised in that described system includes:
Current detection module, for the current value of each input of detection in real time；
First computing module, for according to described current value calculating current rate of change；
Intensity of sunshine detection module, for the intensity of sunshine of each input of detection in real time；
Second computing module, for calculating intensity of sunshine rate of change according to described intensity of sunshine；
3rd computing module, for calculating the ratio of described current changing rate and described intensity of sunshine rate of change；
Comparison module, for respectively by the ratio of described current changing rate and described intensity of sunshine rate of change with pre-
If threshold interval compares, or by the current value of described input and the first preset value or the second preset value ratio
Relatively, or by the current changing rate of described input and the electricity of the input adjacent or close with described input
The ratio of rheology rate with preset current following variation coefficient compare, or will adjacent with described input or
In close input, current following variation coefficient is more than the input of described default current following variation coefficient
Terminal number amount compares with the 3rd preset value, and wherein said first preset value is more than described second preset value；
First judge module, for judging that described current changing rate with the ratio of described intensity of sunshine rate of change is
No in predetermined threshold value interval；
Second judge module, for when described first judge module judged result is for being, determine whether be
The current value of no all adjacent or close inputs is all less than the first preset value；
3rd judge module, for when described second judge module judged result is no, determine whether be
The electricity of the input that the current value of no existence input is the most adjacent or close less than or equal to the second preset value
Flow valuve is more than or equal to the first preset value；
4th computing module, for when described 3rd judge module judged result is no, calculates described input
The current changing rate of end and the ratio of the current changing rate of the input adjacent or close with described input；
4th judge module, for when described 3rd judge module judged result is no, determines whether institute
State the current changing rate of input and the current changing rate of the input adjacent or close with described input
Whether ratio is more than the current following variation coefficient preset；
Statistical module, adds up current following variation coefficient in the input adjacent or close with described input big
Input quantity in default current following variation coefficient；
5th judge module, for judging that the described input quantity that described statistical module counts obtains is the least
In the 3rd preset value；
Determine module, for according to described first judge module, described second judge module, the described 3rd sentence
Disconnected module and described 4th judge module, the judged result of described 5th judge module determine and described input
The solaode string being connected or the duty of upper level header box are the most abnormal.
The working state monitoring system of solar photovoltaic power plant the most according to claim 6, its feature
Be, also include classify alarm module, for determine the solaode string being connected with described input or
After the duty of upper level header box is abnormal, send corresponding alarm signal according to described abnormal class.
The working state monitoring system of solar photovoltaic power plant the most according to claim 7, its feature
Being, described classification alarm module includes:
Comparing unit, for by the current value of described input respectively with null value alarm threshold, lower current limit threshold
Value and upper current limit threshold value compare, and described lower current limit threshold value is more than described null value alarm threshold and little
In described upper current limit threshold value；
Classification alarm unit, is used for when the current value of described input is less than described null value alarm threshold, really
The abnormal class of fixed described duty is that null value is reported to the police, and sends null value alarm signal；At described input
Current value more than described null value alarm threshold and less than described lower current limit threshold value time, determine described work
The abnormal class of state is that electric current low value is out-of-limit, and sends electric current low value off-limit alarm signal；In described input
When the current value of end is more than described upper current limit threshold value, determine that the abnormal class of described duty is that electric current is high
It is worth out-of-limit, and sends electric current high level off-limit alarm signal.
The working state monitoring system of solar photovoltaic power plant the most according to claim 6, its feature
Being, described first judge module includes:
First judging unit, for judging that described current changing rate with the ratio of described intensity of sunshine rate of change is
No for positive number；
Second judging unit, for judging described current changing rate and described sunshine at described first judging unit
After the ratio of change rate of strength is positive number, it is judged that the ratio of described current changing rate and described intensity of sunshine rate of change
Whether value is less than the first predetermined threshold value, if it is, judge that described current changing rate becomes with described intensity of sunshine
The ratio of rate is in predetermined threshold value interval；
Described second judging unit, is additionally operable to judge described current changing rate and institute at described first judging unit
State the ratio of intensity of sunshine rate of change not for after positive number, it is judged that described current changing rate becomes with described intensity of sunshine
Whether the ratio of rate is more than the second predetermined threshold value, if it is, judge described current changing rate and described day
According to the ratio of change rate of strength in predetermined threshold value interval；Described first predetermined threshold value is positive number, described second
Predetermined threshold value is negative.
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