CN104796083B - A kind of work state monitoring method and system of solar photovoltaic power plant - Google Patents
A kind of work state monitoring method and system of solar photovoltaic power plant Download PDFInfo
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- CN104796083B CN104796083B CN201510209449.3A CN201510209449A CN104796083B CN 104796083 B CN104796083 B CN 104796083B CN 201510209449 A CN201510209449 A CN 201510209449A CN 104796083 B CN104796083 B CN 104796083B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000008859 change Effects 0.000 claims abstract description 54
- 238000011897 real-time detection Methods 0.000 claims abstract description 24
- 230000002159 abnormal effect Effects 0.000 claims description 35
- 230000005611 electricity Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 238000013083 solar photovoltaic technology Methods 0.000 abstract description 2
- 230000011664 signaling Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
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- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 a kind of work state monitoring method and system of solar photovoltaic power plant, belongs to solar photovoltaic technology field.The solar photovoltaic power plant includes at least one solar-energy photo-voltaic cell array, solar-energy photo-voltaic cell array includes multiple solar cell strings and the header box with multiple passages, each passage end is connected with a solar cell string or upper level header box, each passage other end is connected with next stage header box or inverter, and methods described includes：The current value of real-time detection each passage, and according to current value calculating current rate of change；The intensity of sunshine of real-time detection each passage, and intensity of sunshine rate of change is calculated according to intensity of sunshine；The ratio of calculating current rate of change and intensity of sunshine rate of change, and the working condition of the solar cell string or upper level header box being connected with passage is determined according to ratio.The work state monitoring method of the solar photovoltaic power plant, monitoring accuracy are high.
Description
Technical field
The present invention relates to solar photovoltaic technology field, more particularly to a kind of working condition of solar photovoltaic power plant
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 loss
Greatly, and in the industry the solar panel species that uses is various, differ greatly in terms of component parameter, for different designs side
Case, can also adopt the inverter of multi-form, so that the difference according to project in actual applications, photovoltaic array
Arrangement mode it is varied.Differed greatly based on each group string operating characteristic in photovoltaic array, therefore be difficult single foundation group
Part characteristic or arrangement mode determine number range to the working condition delimitation of solar cell string (or referred to as group string), and this just gives
The real-time monitoring and fault diagnosis of photovoltaic array brings huge difficulty.As a group string is solar-energy photo-voltaic cell battle array
The basic Component units of row, and whether normal work is sent out the total of the safety and photovoltaic plant of photovoltaic plant is directly influenced to organize string
Electricity, therefore, the real-time current of each group string is monitored and its fault diagnosis is just particularly important.
In prior art, conventional monitoring system mainly realizes the long-range prison of the electric quantity signal to solar photovoltaic power plant
Survey, specifically, simply the different pieces of information of electric quantity signal is shown in the same window, without being directly contrasted knot
Really；Also part monitoring system is monitored to the working condition of photovoltaic plant according to the current changing rate in group string,
But in extraneous appearance interference, such as solar cell string is blocked this kind of monitoring system by the cloud that object is blocked or sailed
When, it is easily caused monitoring result and mistake occurs.
The content of the invention
The work state monitoring method and system of a kind of solar photovoltaic power plant are embodiments provided, is effectively improved
Monitoring accuracy.
Technical scheme provided in an embodiment of the present invention is as follows：
On the one hand, there is provided a kind of work state monitoring method of solar photovoltaic power plant, the solar photovoltaic power plant
Including at least one solar-energy photo-voltaic cell array, the solar-energy photo-voltaic cell array includes multiple solar cell strings and tool
There is the header box of multiple passages, one end of each passage is connected with a solar cell string or upper level header box, often
The other end of the individual passage is connected with next stage header box or inverter, and methods described includes：
The current value of real-time detection each passage, and according to the current value calculating current rate of change；
The intensity of sunshine of real-time detection each passage, and intensity of sunshine rate of change is calculated according to the intensity of sunshine；
Calculate the ratio of the current changing rate and the intensity of sunshine rate of change, and according to the ratio determine with it is described
Solar cell string or the working condition of upper level header box that passage is connected.
Preferably, it is described that the solar cell string or upper level header box being connected with the passage is determined according to the ratio
Working condition include：If the ratio is not in predetermined threshold value is interval, it is determined that the solar-electricity being connected with the passage
The working condition exception of pond string or upper level header box；Otherwise, methods described also includes：
Calculate the ratio of the current changing rate of the current changing rate and the rest channels adjacent with the passage of the passage；
If the ratio of the current changing rate of the current changing rate of the passage and the rest channels adjacent with the passage
More than default current following variation coefficient, it is determined that the solar cell string that is connected with the passage or upper level header box
Working condition exception.
Preferably, if the current changing rate of the current changing rate of the passage and the rest channels adjacent with the passage
Ratio be less than or equal to default current following variation coefficient, methods described also includes：
In the statistics rest channels adjacent with the passage, current following variation coefficient is more than the default current following
The number of channels of variation coefficient；
If the quantity is less than predetermined number, it is determined that the solar cell string being connected with the passage or upper level are converged
The working condition exception of stream case.
Preferably, it is determined that the working condition exception of the solar cell string that is connected with the passage or upper level header box
Afterwards, methods described also includes：The abnormal class of the working condition is determined according to the current value of the passage, and according to described different
Often classification sends corresponding alarm signal.
Preferably, the current value according to the passage determines the abnormal class of the working condition, and according to described
Abnormal class sends corresponding alarm signal, including：By the current value of the passage respectively with null value alarm threshold, lower current limit
Threshold value and upper current limit threshold value are compared, and the lower current limit threshold value is more than the null value alarm threshold and is less than the electricity
Stream upper limit threshold；
If the current value of the passage is less than the null value alarm threshold, it is determined that the abnormal class of the working condition
Report to the police for null value, and send null value alarm signal；
If the current value of the passage is more than the null value alarm threshold and is less than the lower current limit threshold value, really
The abnormal class of the fixed working condition is that electric current low value is out-of-limit, and sends electric current low value off-limit alarm signal；
If the current value of the passage is more than the upper current limit threshold value, it is determined that the abnormal class of the working condition
It is out-of-limit for electric current high level, and send electric current high level off-limit alarm signal.
On the other hand, there is provided a kind of working state monitoring system of solar photovoltaic power plant, the solar photovoltaic
Stand including at least one solar-energy photo-voltaic cell array, the solar-energy photo-voltaic cell array include multiple solar cell strings and
Header box with multiple passages, one end of each passage are connected with a solar cell string or upper level header box,
The other end of each passage is connected with next stage header box or inverter, and the system includes：
Current detection module, the current value of each passage for real-time detection；
First computing module, for according to the current value calculating current rate of change；
Intensity of sunshine detection module, the intensity of sunshine of each passage for real-time detection；
Second computing module, for calculating intensity of sunshine rate of change according to the intensity of sunshine；
3rd computing module, for calculating the ratio of the current changing rate and the intensity of sunshine rate of change；
Determining module, for determining that the solar cell string being connected with the passage or upper level are confluxed according to the ratio
The working condition of case.
Preferably, the determining module includes：
First determining unit, for the ratio not in predetermined threshold value is interval when, it is determined that being connected with the passage
The working condition exception of solar cell string or upper level header box；
Computing unit, for when the ratio is in predetermined threshold value is interval, calculate the passage current changing rate and
The ratio of the current changing rate of the rest channels adjacent with the passage；
Second determining unit, for the current changing rate in the passage and the electricity of the rest channels adjacent with the passage
The ratio of rheology rate be more than default current following variation coefficient when, it is determined that the solar cell string being connected with the passage or
The working condition exception of upper level header box.
Preferably, the determining module also includes：
Statistic unit, for current following variation coefficient in the statistics rest channels adjacent with the passage more than described pre-
If current following variation coefficient number of channels；3rd determining unit, for the quantity be less than predetermined number when, it is determined that
The solar cell string being connected with the passage or the working condition exception of upper level header box.
Preferably, the system also includes：
Classification alarm module, for determining the solar cell string or upper being connected with the passage in the determining module
After the working condition exception of level header box, the abnormal class of the working condition, and root are determined according to the current value of the passage
Corresponding alarm signal is sent according to the abnormal class.
Preferably, the classification alarm module includes：
Comparing unit, for by the current value of the passage respectively with null value alarm threshold, lower current limit threshold value and electric current
Upper limit threshold is compared, and the lower current limit threshold value is more than the null value alarm threshold and is less than the upper current limit threshold value；
Classification alarm unit, when being less than the null value alarm threshold for the current value in the passage, determines the work
The abnormal class for making state is reported to the police for null value, and sends null value alarm signal；It is more than the null value in the current value of the passage
Alarm threshold and be less than the lower current limit threshold value, determine the working condition abnormal class be electric current low value it is out-of-limit, concurrently
Go out electric current low value off-limit alarm signal；When the current value of the passage is more than the upper current limit threshold value, the work is determined
The abnormal class of state 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 and system of solar photovoltaic power plant provided in an embodiment of the present invention, by real-time detection
The current value of each passage, and according to current value calculating current rate of change, the intensity of sunshine of real-time detection each passage, and according to
Intensity of sunshine calculates intensity of sunshine rate of change, and then the ratio according to current changing rate with intensity of sunshine rate of change determines and passage
The working condition of connected solar cell string or upper level header box, due to by generation current data of real-time detection and can
The intensity of sunshine data of reflection ambient conditions combine and are monitored, and can reduce the dependence to historical data and external interference
The erroneous judgement for causing, so as to effectively improve monitoring accuracy.
Description of the drawings
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 institute in embodiment
The accompanying drawing that needs are used is briefly described, it should be apparent that, drawings in the following description are only described in the present invention
A little embodiments, for those of ordinary skill in the art, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is a kind of structural representation of solar photovoltaic power plant provided in an embodiment of the present invention；
Fig. 2 is a kind of flow chart of the work state monitoring method of solar photovoltaic power plant provided in an embodiment of the present invention；
Fig. 3 is the flow process of the work state monitoring method of second solar photovoltaic power plant provided in an embodiment of the present invention
Figure；
Fig. 4 is the flow process of the work state monitoring method of the third solar photovoltaic power plant provided in an embodiment of the present invention
Figure；
Fig. 5 is the flow process of the work state monitoring method of the 4th kind of solar photovoltaic power plant provided in an embodiment of the present invention
Figure；
Fig. 6 is a kind of structural representation of the working state monitoring system of solar photovoltaic power plant provided in an embodiment of the present invention
Figure；
Fig. 7 is that the structure of the working state monitoring system of second solar photovoltaic power plant provided in an embodiment of the present invention is shown
It is intended to；
Fig. 8 is that the structure of the working state monitoring system of the third solar photovoltaic power plant provided in an embodiment of the present invention is shown
It is intended to；
Fig. 9 is that the structure of the working state monitoring system of the 4th kind of solar photovoltaic power plant provided in an embodiment of the present invention is shown
It is intended to；
Figure 10 is the structure of the working state monitoring system of the 5th kind of solar photovoltaic power plant provided in an embodiment of the present invention
Schematic diagram.
Specific embodiment
In order that those skilled in the art more fully understand the scheme of the embodiment of the present invention, below in conjunction with the accompanying drawings and implement
Mode is described in further detail to the embodiment of the present invention.
A kind of work state monitoring method of solar photovoltaic power plant is embodiments provided, wherein, solar energy
Overhead utility includes at least one solar-energy photo-voltaic cell array, solar-energy photo-voltaic cell array include multiple solar cell strings and
Header box with multiple passages, one end of each passage are connected with a solar cell string or upper level header box, each
The other end of passage is connected with next stage header box or inverter.As shown in figure 1, for one kind provided in an embodiment of the present invention too
It is positive can photo-voltaic power generation station a part, that is, illustrate only two-stage conflux composition photovoltaic array a part, in actual applications,
The photovoltaic array can continue to increase and conflux rank.In the present embodiment, in photovoltaic array, assembly connecting mode is：X individual (x >=1) is too
It is positive can cell plate group into a solar cell string, the one-level for entering 1 using n is confluxed, will n solar cell string pass through same
The passage 1 of individual one-level header box is confluxed to passage n, while two grades of 1 are entered using m again conflux, will m one-level header box
Passage output electric current confluxed to passage m by the passage 1 of same two grades of header boxs, finally unify confluxed by two grades
The passage output of case.I represents the current value of each passage input of header box.I represents the output current value of header box passage.N is represented
The maximum solar cell string quantity that one-level header box can be accessed, such as model 8 enters 1 one-level header box, be up to 8
Passage, at most can access 8 solar cell strings, and different one-level header boxs when actually used may be real in exact arrangement
Solar cell string quantity difference is accessed on border, and such as Z1-H1 header boxs are actually only connected to 7 passages connection solar cell strings,
Z1-H2 header boxs are actual to be connected with 6 input solar cell strings.M represents the connect maximum that can be accessed of two grades of header boxs
Way amount, such as model 10 enters 1 two grades of header boxs, be up to 10 passages can at most connect 10 one-level header boxs
Passage.If one-level header box is 8 models for entering, then the electric current of this 10 two grades of header box each passage for entering 1 will be one
The output of individual one-level header box, is the sum of 8 solar cell string electric currents, and the output current of whole two grades of header boxs is preferably at most 80
The sum of individual solar cell string electric current.What different two grades of header boxs when actually used actually may be accessed in exact arrangement
Solar cell string quantity is different, and such as Z1 header boxs are actually only connected to 9 one-level header boxs, and the passage 1 of Z1 header boxs meets Z1-H1
The passage of number header box, the passage 2 of Z1 header boxs connect the passage of Z1-H2 header boxs, the like.Or, Z1 header boxs are removed
It is connected with outside one-level header box, also there is the passage for being directly connected to solar cell string.That is, for one-level header box
Z1-H1 to Z1-Hm, in n passage of one-level header box, multiple or whole passages are connect with solar cell series winding, and are allowed
There is vacant passage in one-level header box；And for two grades of header box Z1, at least one passage is logical with one-level header box
Road connect other passages can with solar cell series winding connect, or two grades of header boxs as shown in Figure 1 it is all passage 1
It is connected with one-level header box Z1-H1 to Z1-Hm to passage m respectively, and allows the presence of vacant passage.The header box of higher level
The like until N levels (N is integer and N >=2).
In in the present embodiment photovoltaic array adopted by solar power station, each subcircuits of header boxs at different levels have with ShiShimonoseki
System：
1st, for one-level header box：By taking Z1-H1 header boxs as an example, the electric current of its passage has as follows with the current value of passage
Relation：IZI-H1=i11+i12+···+i1n.Z1-H1 header boxs have n passage, and each passage only connects a string of solar-electricities
Go here and there in pond, then the current value of its each passage is exactly the electric current of each connect solar cell string, i.e.,：iPassage 1=i11。
2nd, for two grades of header boxs：By taking Z1 header boxs as an example, the current value of its passage has as follows with the current value of passage
Relation：IZI=i1+i2+···+im.Wherein, i1For the input current value of the passage 1 of two grades of header box Z1, the current value is equal to
The output current value I of the passage of one-level header box Z1-H1ZI-H1, i2To imThe like.Z1 header boxs have m passage, each
Passage all connects an one-level header box, then the current value of each passage of two grades of header box Z1 is exactly the one-level for each being connected
The current value of the passage of header box, the sum of actually n solar cell string current value, i.e.,：The i of two grades of header boxsPassage 1=i1
=IZI-H1=i11+i12+···+i1n, iPassage m=im=IZI-Hm=im1+im2+···+imn.And if Z1 header boxs both
Presence is directly connected to the passage of solar cell string, there is also the passage of connection one-level header box, then the passage of Z1 header boxs
Current value be equal to the current value of the solar cell string and passage of each one-level header box for directly connecting current value it
With.
The header box of the higher level for N ＞ 2, calculation the like, no longer describe in detail herein.N level header boxs
Passage the access grid-connected point of electric current Jing inverters, into power supply grid.
In the case of header box normal work, the current value of each passage of header box is easily detected, due to each
Passage is connected with the passage of a solar cell string or higher level's header box, therefore, it is also stream that the current value of each passage is actual
Cross the current value of the solar cell string or higher level's header box being connected with the header box.
As solar cell is the basic Component units of solar photovoltaic power plant, structure after multiple solar cells are connected
Into a solar cell string, for different solar photovoltaic power plants, the arrangement mode of photovoltaic array might have
Relatively big difference, as the quantity of solar-energy photo-voltaic cell string is more, can adopt one or more header boxs by solar cell
The generated energy of string is confluxed, thus it is guaranteed that each solar cell string and header box can normal work be to ensure the sun
The premise of energy photovoltaic plant normal work.
As shown in Fig. 2 the monitoring method includes：
Step 101：The current value of real-time detection each passage, and according to current value calculating current rate of change.
In the case of passage normal work, the current value of each passage is easily detected, due to each passage and one
Solar cell string or higher level's header box are connected, therefore, it is also to flow through the solar-electricity being connected with the passage that this current value is actual
Pond go here and there or higher level's header box current value, wherein, current changing rate is the abbreviation of current value rate over time, is detected respectively
After going out the current value at two moment, those skilled in the art easily calculate current changing rate.
Step 102：The intensity of sunshine of real-time detection each passage, and intensity of sunshine change is calculated according to the intensity of sunshine
Rate.
Above-mentioned intensity of sunshine is also referred to as sunshine amplitude, for certain solar cell string, from t0Moment is to t
Intensity of sunshine rate of change=(intensity of sunshine(t)- intensity of sunshine(t0))/intensity of sunshine(t0).Rate of change can reflect a period of time
Interior sunshine situation of change.By the intensity of sunshine data of each passage of real-time monitoring, more real ring can not only be gathered
Border data, it is not necessary to refer to history gas phase data or buy special gas phase data, effectively reduce purchase cost, and make
Obtain present embodiment and there is higher exploitativeness.
Step 103：The ratio of calculating current rate of change and intensity of sunshine rate of change.
Step 104：The working condition of the solar cell string or upper level header box being connected with passage is determined according to ratio.
Current changing rate is obtained by step 101, after step 102 obtains intensity of sunshine rate of change, is easily calculated
To current changing rate and the ratio of intensity of sunshine rate of change, determined according to the ratio solar cell string that is connected with passage or
The working condition of upper level header box, as real-time generation current data being combined with environmental data, even if in solar energy
When battery strings or header box are blocked by the cloud that object is blocked or sailed, it is also possible to obtain accurately monitoring knot
Really, so as to effectively improving monitoring accuracy；Further, since real-time detection intensity of sunshine situation of change, more reflects true environment
Situation, can be independent of history meteorological data, further enhancing the exploitativeness of the method.
It should be noted that the execution sequence of above-mentioned steps 101 and step 102 is not limited to said sequence, both first can hold
Row step 101, it is also possible to first carry out step 102, acceptable execution step 101 and step 102 simultaneously, the embodiment of the present invention are not done
It is concrete to limit.
As shown in figure 3, above-mentioned steps 104 determine the solar energy being connected with passage according to the calculated ratio of step 103
The working condition of battery strings or upper level header box, including：
Step 201：The ratio is judged whether not in predetermined threshold value is interval, if it is, execution step 202：It is determined that with
Solar cell string or the working condition exception of upper level header box that passage is connected；Otherwise, the method is further comprising the steps of：
Step 203：Calculate the ratio of the current changing rate of the current changing rate and the rest channels adjacent with passage of passage；
Step 204：Judge the ratio of the current changing rate of the current changing rate and the rest channels adjacent with passage of passage
Whether default current following variation coefficient is more than；
If it is, execution step 202：It is determined that the work of the solar cell string being connected with passage or upper level header box
Abnormal state.
If as shown in figure 4, the ratio of the current changing rate of the current changing rate of passage and the rest channels adjacent with passage
Value also includes less than or equal to default current following variation coefficient, said method：
Step 301：In the statistics rest channels adjacent with the passage, current following variation coefficient is more than described default
The number of channels of current following variation coefficient；
Wherein, the current following variation coefficient in step 301 refers to the current changing rate of this passage and adjacent with this passage
The ratio of the current changing rate of rest channels, the passage in step 301 refers in step 204 as the passage for judging object,
That is, be adjacency channel in step 204 as the passage for judging object as " this passage " of objects of statistics herein.
Step 302：Judge the number of channels for counting whether less than predetermined number；If it is, execution step 202：It is determined that
The solar cell string being connected with passage or the working condition exception of upper level header box.
As shown in figure 5, it is determined that the working condition exception of the solar cell string that is connected with passage or upper level header box
Afterwards, said method also includes：
Step 401：The abnormal class of working condition is determined according to the current value of passage, and is sent accordingly according to abnormal class
Alarm signal.
The definition of several fundamental quantities in order to be described in detail to the embodiment of the present invention, is first given below, and is combined basic
Amount is further to a preferred embodiment of the present invention will be described in detail.
(1) channel current：Refer to the actual current value of each passage of header box；
(2) warning remote signalling amount：Carry out internal calculation according to the analog signalses for being gathered, the digital remote signalling amount of output (0 or
1), different digital remote signalling amounts represents different implications；
(3) null value is reported to the police：Whether it is zero according to channel current, determines whether to send alarm signal, " 0 " represents the passage
Institute's connected components do not work, and 1 to represent the passage institute connected components in running order, wherein, component is mainly included by multiple solar energy
The solar cell string constituted by battery；
(4) electric current low value is out-of-limit：Represent that channel current occurs current value reduction by a relatively large margin, " 0 " generation at current time
The table passage institute connected components electric current does not almost change, in normal operating conditions；" 1 " represents the passage institute connected components electricity
Stream occurs to change by a relatively large margin, in abnormal working position；
(5) electric current high level is out-of-limit：Represent that channel current occurs current value increase by a relatively large margin, " 0 " generation at current time
The table passage institute connected components electric current does not almost change, in normal operating conditions；" 1 " represents the passage institute connected components electricity
Stream occurs to change by a relatively large margin, in abnormal working position；
Individually below null value is reported to the police, electric current high level is out-of-limit and electric current low value is out-of-limit is described in detail：
For (3) null value is reported to the police：
In embodiments of the present invention, by judging whether channel current value is 0, can interpolate that passage whether normal work.
If in same header box institute connected components, any one passage has stably exported generation current, and is in a certain under the header box
Individual channel current value is 0, then the current value is that 0 passage sends " null value warning ", there is failure so as to remind at the passage.By
In some passage normal works of same header box, illustrate that weather condition possesses power generation conditions at that time, and now certain passage
Channel current is " 0 ", illustrates that all solar cell strings connect under the passage do not generate electricity, belongs to abnormal conditions, and which is former certainly
Because varied, certain component damage in the protection fuse damage connected such as group or group string, or the group are serially connected with and ask
Topic etc., will discharge concrete failure, and needs are further detected to component.
Specifically can according to actual needs, arrange null value report to the police condition, for example, can arrange when channel current meet with
The condition for during lower condition, sending " null value warning " signal (i.e. remote signalling amount set) is：
(1) an adjustable null value warning initiation value virtual value q is set, when in same header box, arbitrarily a branch current is big
When q, null value warning function just comes into operation；
(2) the effective thresholding g of one adjustable null value warning of setting, when the electric current that any one group is ganged up is less than g, is considered as
The branch current is 0, sends " null value warning ".
In embodiments of the present invention, as under normal circumstances, photovoltaic module output is relatively stable, there is no the work electricity of fixation
Stream, output current change with the change of irradiation (intensity of sunshine), it is generally the case that the irradiation of sunlight is that steady and continuous become
Change, and affected by diffusion etc., transition will not occur, therefore, under normal circumstances, group string electric current is relatively stable, will not be mutated, when
During faulty or damage, its output current will occur significant change.Therefore, it can by detection group string real-time current variable quantity come
Judge group string whether normal work.
It is out-of-limit for (4) electric current low value：
Determine whether that channel current is undergone mutation by comparing variable quantity of the current value within the time for arranging to exceed
Normal limit, judges group string whether normal work.If having multichannel in same header box while when there is the larger transition of electric current,
Now think that exception do not occur in the solar cell string being connected with passage or header box, and be probably have object to block or cloud
Sail and cause, now, do not send abnormal alarm signal.
When channel current meets following condition, " electric current low value is out-of-limit " warning, the i.e. out-of-limit remote signalling amount of electric current low value are sent
Set (putting 1) condition is：
(1) arranging sunshine amplitude follows variation coefficient R1 to calculate current sunshine changes in amplitude rate, if sunshine changes in amplitude rate is
Negative value, and sunshine changes in amplitude rate exceedes set sunshine amplitude with covariant with the absolute value of the ratio of channel current rate of change
Change coefficient, then the out-of-limit coefficient of electric current high level puts 1；With reference to the sunshine changes in amplitude coefficient in (4) and (5) understand, when ratio not
In predetermined threshold value is interval, it is determined that the solar cell string being connected with passage or the working condition exception of upper level header box,
Positive and negative according to sunshine amplitude change rate can be determined that low value is out-of-limit or high level is out-of-limit.
(2) genetic coefficient S (integer represents circumferential passages comparison range) simultaneously is set, and setting is compared passage and follows change
Coefficient B 1, calculates the ratio of parameatal other channel current rates of change, when the ratio is followed more than set passage
During variation coefficient, the out-of-limit coefficient of electric current high level puts 1.
(3) the out-of-limit coefficient l (also becoming lower current limit threshold value) of electric current low value is set：I.e. channel current variable quantity is less than electric current
L times when, send " electric current low value is out-of-limit " warning.
As (in(0)-in(t))<Imin=lin(0), output current low value off-limit alarm；Wherein, l is that electric current low value limits system
Number, (0,1), this variable can be by background maintenance software design patterns, and monitoring backstage real-time Communication for Power, and n is integer, and representative is confluxed for l ∈
Certain loop in case, n are port number to the maximum, and t is certain loop, and timer periods, this variable can be set by background maintenance software
Put, adjustable range carries out different settings according to disparity items.
It is out-of-limit for (5) electric current high level：
Channel current is determined whether by comparing variable quantity of the current value within the time for arranging to undergo mutation, is exceeded
Normal limit, judges group string whether normal work.
When channel current meets following condition, " electric current high level is out-of-limit " warning, the i.e. out-of-limit remote signalling amount of electric current high level are sent
The condition for putting 1 is：
(1) calculate current sunshine changes in amplitude rate, if sunshine changes in amplitude rate be on the occasion of, and sunshine changes in amplitude rate with it is logical
The absolute value of the ratio of road current changing rate follows variation coefficient R2 more than set sunshine amplitude, then electric current high level is out-of-limit
Coefficient puts 1；
(2) arrange and compare passage and follow variation coefficient B2, calculate the ratio of parameatal other channel current rates of change
Value, when the ratio follows variation coefficient more than set passage, the out-of-limit coefficient of electric current low value puts 1.
(3) the out-of-limit coefficient h (also referred to as upper current limit threshold value) of electric current high level is set：I.e. channel current variable quantity is higher than electric current
H times when, outputting alarm remote signalling.
As (in(t)-in(0))>Imax=hin(0), output current high level Threshold Crossing Alert remote signalling, wherein, h is limited for electric current high level
Coefficient, h ∈ (0,1), this variable can have read-write window by background maintenance software design patterns, can by 485 order wires it is direct under
It is downloaded in equipment, without programming program again, n is integer, represents certain loop in header box, n is actual circuitry number to the maximum,
T is certain loop, and timer periods, this variable can be carried out according to disparity items by background maintenance software design patterns, adjustable range
It is different to arrange.
The work state monitoring method of solar photovoltaic power plant provided in an embodiment of the present invention, by real-time detection, each leads to
The current value in road, and according to current value calculating current rate of change, the intensity of sunshine of real-time detection each passage, and it is strong according to sunshine
Degree calculates intensity of sunshine rate of change, then determines with passage be connected with the ratio of intensity of sunshine rate of change according to current changing rate
The working condition of solar cell string or upper level header box, as the generation current data of real-time detection and ring will can be reflected
The intensity of sunshine data of border situation combine and are monitored, and can reduce the dependence to historical data and external interference causes
Erroneous judgement, so as to effectively improve monitoring accuracy.
Correspondingly, the embodiment of the present invention additionally provides a kind of working state monitoring system of solar photovoltaic power plant, such as Fig. 6
It is shown, wherein, solar photovoltaic power plant includes at least one solar-energy photo-voltaic cell array, and solar-energy photo-voltaic cell array includes
Multiple solar cell strings and the header box with multiple passages, one end of each passage and a solar cell string or upper
Level header box is connected, and the other end of each passage is connected with next stage header box or inverter, and the system includes：
Current detection module 501, for the current value of each passage of real-time detection；
First computing module 502, for the current value calculating current rate of change；
Intensity of sunshine detection module 503, for the intensity of sunshine of each passage of real-time detection；
Second computing module 504, for calculating intensity of sunshine rate of change according to intensity of sunshine；
3rd computing module 505, for calculating current rate of change and the ratio of intensity of sunshine rate of change；
Determining module 506, for determining the solar cell string that is connected with passage or upper level header box according to ratio
Working condition.
As shown in fig. 7, above-mentioned determining module 506 includes：
First determining unit 601, for when ratio is not interval interior in predetermined threshold value, it is determined that the solar energy being connected with passage
The working condition exception of battery strings or upper level header box；
Computing unit 602, for when ratio is in predetermined threshold value is interval, calculating the current changing rate and and passage of passage
The ratio of the current changing rate of adjacent rest channels；
Second determining unit 603, the electric current for the current changing rate in passage and the rest channels adjacent with passage become
When the ratio of rate is more than default current following variation coefficient, it is determined that the solar cell string being connected with passage or upper level are converged
The working condition exception of stream case.
As shown in figure 8, above-mentioned determining module 506 is further comprised：
Statistic unit 701, is more than institute for current following variation coefficient in the statistics rest channels adjacent with the passage
State the number of channels of default current following variation coefficient；3rd determining unit 702, is additionally operable to be less than present count in the quantity
During amount, it is determined that the working condition exception of the solar cell string being connected with passage or upper level header box.
As shown in figure 9, in another embodiment of present system, the system also includes：
Classification alarm module 801, for determining that the solar cell string being connected with passage or upper level are converged in determining module
After the working condition exception of stream case, the abnormal class of working condition is determined according to the current value of passage, and is sent out according to abnormal class
Go out corresponding alarm signal.
As shown in Figure 10, a kind of concrete structure of above-mentioned classification alarm module 801 includes：
Comparing unit 901, for by the current value of passage respectively with null value alarm threshold, lower current limit threshold value and electric current
Limit threshold value is compared, wherein, lower current limit threshold value is more than null value alarm threshold and is less than upper current limit threshold value；
Classification alarm unit 902, when being less than null value alarm threshold for the current value in passage, determines the different of working condition
Often classification is reported to the police for null value, and sends null value alarm signal；It is more than null value alarm threshold in the current value of passage and is less than electric current
Lower threshold, determines that the abnormal class of working condition is that electric current low value is out-of-limit, and sends electric current low value off-limit alarm signal；Logical
When the current value in road is more than upper current limit threshold value, determines that the abnormal class of working condition is that electric current high level is out-of-limit, and send electric current
High level off-limit alarm signal.
Certainly, alarm module 801 of classifying is not limited to said structure, can have to need other according to practical application
Body realizes structure, and this embodiment of the present invention is not limited.
The working state monitoring system of solar photovoltaic power plant provided in an embodiment of the present invention, by real-time detection, each leads to
The current value in road, and according to current value calculating current rate of change, the intensity of sunshine of real-time detection each passage, and it is strong according to sunshine
Degree calculates intensity of sunshine rate of change, then determines with passage be connected with the ratio of intensity of sunshine rate of change according to current changing rate
The working condition of solar cell string or upper level header box, as the generation current data of real-time detection and ring will can be reflected
The intensity of sunshine data of border situation combine and are monitored, and can reduce the dependence to historical data and external interference causes
Erroneous judgement, so as to effectively improve monitoring accuracy.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiment.Especially for system reality
For applying example, as which is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to embodiment of the method
Part explanation.System embodiment described above is only schematic, wherein described illustrate as separating component
Module or unit can be or may not be physically separate, as the part that unit shows can be or also may be used
Not being physical location, you can with local positioned at one, or can also be distributed on multiple units.Can be according to actual need
Select some or all of module therein to realize the purpose of this embodiment scheme.Those of ordinary skill in the art are not paying
In the case of going out creative work, you can to understand and implement.
The foregoing is only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (10)
1. a kind of work state monitoring method of solar photovoltaic power plant, the solar photovoltaic power plant include at least one sun
Energy photovoltaic battery array, the solar-energy photo-voltaic cell array include multiple solar cell strings and confluxing with multiple passages
Case, one end of each passage are connected with a solar cell string or upper level header box, each passage it is another
End is connected with next stage header box or inverter, it is characterised in that methods described includes：
The current value of real-time detection each passage, and according to the current value calculating current rate of change；
The intensity of sunshine of real-time detection each passage, and intensity of sunshine rate of change is calculated according to the intensity of sunshine；
The ratio of the current changing rate and the intensity of sunshine rate of change is calculated, if the ratio is not interval in predetermined threshold value
It is interior, it is determined that the solar cell string being connected with the passage or the working condition exception of upper level header box.
2. the work state monitoring method of solar photovoltaic power plant according to claim 1, it is characterised in that if described
In predetermined threshold value is interval, methods described also includes ratio：
Calculate the ratio of the current changing rate of the current changing rate and the rest channels adjacent with the passage of the passage；
If the ratio of the current changing rate of the current changing rate of the passage and the rest channels adjacent with the passage is more than
Default current following variation coefficient, it is determined that the work of the solar cell string or upper level header box that are connected with the passage
Abnormal state.
3. the work state monitoring method of solar photovoltaic power plant according to claim 2, it is characterised in that if described
The ratio of the current changing rate of the current changing rate of passage and the rest channels adjacent with the passage is less than or equal to default
Current following variation coefficient, methods described also include：
In the statistics rest channels adjacent with the passage, current following variation coefficient is more than the default current following change
The number of channels of coefficient；
If the quantity is less than predetermined number, it is determined that the solar cell string being connected with the passage or upper level header box
Working condition exception.
4. the work state monitoring method of the solar photovoltaic power plant according to any one of claims 1 to 3, its feature exist
In, it is determined that after the working condition exception of the solar cell string that is connected with the passage or upper level header box, methods described
Also include：The abnormal class of the working condition is determined according to the current value of the passage, and is sent according to the abnormal class
Corresponding alarm signal.
5. the work state monitoring method of solar photovoltaic power plant according to claim 4, it is characterised in that the basis
The current value of the passage determines the abnormal class of the working condition, and sends corresponding alarm signal according to the abnormal class
Number, including：The current value of the passage is compared with null value alarm threshold, lower current limit threshold value and upper current limit threshold value respectively
Compared with the lower current limit threshold value is more than the null value alarm threshold and is less than the upper current limit threshold value；
If the current value of the passage is less than the null value alarm threshold, it is determined that the abnormal class of the working condition is zero
Value is reported to the police, and sends null value alarm signal；
If the current value of the passage is more than the null value alarm threshold and is less than the lower current limit threshold value, it is determined that institute
The abnormal class for stating working condition is that electric current low value is out-of-limit, and sends electric current low value off-limit alarm signal；
If the current value of the passage is more than the upper current limit threshold value, it is determined that the abnormal class of the working condition is electricity
Stream high level is out-of-limit, and sends electric current high level off-limit alarm signal.
6. the working state monitoring system of a kind of solar photovoltaic power plant, the solar photovoltaic power plant include at least one sun
Energy photovoltaic battery array, the solar-energy photo-voltaic cell array include multiple solar cell strings and confluxing with multiple passages
Case, one end of each passage are connected with a solar cell string or upper level header box, each passage it is another
End is connected with next stage header box or inverter, it is characterised in that the system includes：
Current detection module, the current value of each passage for real-time detection；
First computing module, for according to the current value calculating current rate of change；
Intensity of sunshine detection module, the intensity of sunshine of each passage for real-time detection；
Second computing module, for calculating intensity of sunshine rate of change according to the intensity of sunshine；
3rd computing module, for calculating the ratio of the current changing rate and the intensity of sunshine rate of change；
Determining module, including the first determining unit, for when the ratio is not interval interior in predetermined threshold value, it is determined that logical with described
Solar cell string or the working condition exception of upper level header box that road is connected.
7. the working state monitoring system of solar photovoltaic power plant according to claim 6, it is characterised in that the determination
Module also includes：
Computing unit, for when the ratio is in predetermined threshold value is interval, calculate the passage current changing rate and with institute
State the ratio of the current changing rate of the adjacent rest channels of passage；
Second determining unit, the electric current for the current changing rate in the passage and the rest channels adjacent with the passage become
When the ratio of rate is more than default current following variation coefficient, it is determined that the solar cell string being connected with the passage or upper one
The working condition exception of level header box.
8. the working state monitoring system of solar photovoltaic power plant according to claim 7, it is characterised in that the determination
Module also includes：
Statistic unit, for current following variation coefficient in the statistics rest channels adjacent with the passage more than described default
The number of channels of current following variation coefficient；
3rd determining unit, for when the quantity is less than predetermined number, it is determined that the solar cell being connected with the passage
The working condition exception of string or upper level header box.
9. the working state monitoring system of the solar photovoltaic power plant according to any one of claim 6 to 8, its feature exist
In the system also includes：
Classification alarm module, for determining that the solar cell string being connected with the passage or upper level are converged in the determining module
After the working condition exception of stream case, the abnormal class of the working condition is determined according to the current value of the passage, and according to institute
State abnormal class and send corresponding alarm signal.
10. the working state monitoring system of solar photovoltaic power plant according to claim 9, it is characterised in that described point
Class alarm module includes：
Comparing unit, for by the current value of the passage respectively with null value alarm threshold, lower current limit threshold value and upper current limit
Threshold value is compared, and the lower current limit threshold value is more than the null value alarm threshold and is less than the upper current limit threshold value；
Classification alarm unit, when being less than the null value alarm threshold for the current value in the passage, determines the work shape
The abnormal class of state is reported to the police for null value, and sends null value alarm signal；Report to the police more than the null value in the current value of the passage
Thresholding and the lower current limit threshold value is less than, determines that the abnormal class of the working condition is that electric current low value is out-of-limit, and send electricity
Stream low value off-limit alarm signal；When the current value of the passage is more than the upper current limit threshold value, the working condition is determined
Abnormal class be that electric current high level is out-of-limit, and send electric current high level off-limit alarm signal.
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