CN104796083A - Solar photovoltaic plant operating state monitoring method and system - Google Patents
Solar photovoltaic plant operating state monitoring method and system Download PDFInfo
- Publication number
- CN104796083A CN104796083A CN201510209449.3A CN201510209449A CN104796083A CN 104796083 A CN104796083 A CN 104796083A CN 201510209449 A CN201510209449 A CN 201510209449A CN 104796083 A CN104796083 A CN 104796083A
- Authority
- CN
- China
- Prior art keywords
- current
- passage
- value
- header box
- operating state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000002159 abnormal effect Effects 0.000 claims description 60
- 238000011897 real-time detection Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010248 power generation Methods 0.000 abstract description 3
- 230000011664 signaling Effects 0.000 description 8
- 238000003745 diagnosis Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 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
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013083 solar photovoltaic technology Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a solar photovoltaic plant operating state monitoring method and system and belongs to the technical field of solar photovoltaic power generation. A solar photovoltaic plant comprises at least one solar photovoltaic cell array, each solar photovoltaic cell array comprises multiple solar cell strings and combiner boxes with multiple channels, one end of each channel is connected with one solar cell string or the upper combiner box, and the other end of each channel is connected with the lower combiner box or an inverter. The method includes: detecting a current value of each channel in real time, and calculating current change ratio according to the current value; detecting sunlight intensity of each channel in real time, and calculating sunlight intensity change rate according to the sunlight intensity; calculating the ratio between the current change rate and the sunlight intensity change rate, and determining the operating state of the solar cell string or the upper combiner box connected with the channel according to the ratio. The solar photovoltaic plant operating state monitoring method is high in monitoring accuracy.
Description
Technical field
The present invention relates to solar photovoltaic technology field, particularly a kind of work state monitoring method of solar photovoltaic power plant and system.
Background technology
Solar-energy photo-voltaic cell array in solar photovoltaic power plant and the line between inverter is various, line loss is large, and the solar panel used in the industry is of a great variety, component parameter aspect differs greatly, for different designs scheme, also multi-form inverter can be adopted, thus making in actual applications according to the difference of project, the arrangement mode of photovoltaic array is varied.Differ greatly based on group string operating characteristic each in photovoltaic array, therefore very difficult single foundation component characteristic or arrangement mode delimited to the operating state of solar cell string (or being called group string) and determined number range, and this just brings huge difficulty to the Real-Time Monitoring of photovoltaic array and failure diagnosis.Due to the basic comprising unit that group string is solar-energy photo-voltaic cell array, and whether group string normally works the gross generation of the safety and photovoltaic plant that directly have influence on photovoltaic plant, therefore, the real-time current of each group of string to be monitored and failure diagnosis just seems particularly important.
In prior art, conventional monitoring system mainly realizes the remote monitoring of the electric quantity signal to solar photovoltaic power plant, specifically, just the different pieces of information of electric quantity signal is shown at the same window, and directly can not form comparing result; Also part monitoring system is had can to monitor according to the working condition of current changing rate to photovoltaic plant in group string, but when there is interference in the external world in this kind of monitoring system, such as solar cell string is subject to object and blocks or under the cloud of sailing the situation such as to block, easily cause monitoring result to occur mistake.
Summary of the invention
Embodiments provide a kind of work state monitoring method and system of solar photovoltaic power plant, effectively improve monitoring accuracy.
The technical scheme that the embodiment of the present invention provides is as follows:
On the one hand, provide a kind of work state monitoring method of solar photovoltaic power plant, described solar photovoltaic power plant comprises at least one solar-energy photo-voltaic cell array, described solar-energy photo-voltaic cell array comprises multiple solar cell string and has the header box of multiple passage, one end of each described passage is connected with a solar cell string or upper level header box, the other end of each described passage is all connected with next stage header box or inverter, and described method comprises:
The current value of each described passage of real-time detection, and according to described current value calculating current rate of change;
The intensity of sunshine of each described passage of real-time detection, and calculate intensity of sunshine rate of change according to described intensity of sunshine;
Calculate the ratio of described current changing rate and described intensity of sunshine rate of change, and determine the operating state of solar cell string or the upper level header box be connected with described passage according to described ratio.
Preferably, describedly determine that the operating state of solar cell string or the upper level header box be connected with described passage comprises according to described ratio: if described ratio is not in predetermined threshold value interval, then determine that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal; Otherwise described method also comprises:
Calculate the ratio of the current changing rate of described passage and the current changing rate of the rest channels adjacent with described passage;
If the ratio of the current changing rate of the current changing rate of described passage and the rest channels adjacent with described passage is greater than default current following variation coefficient, then determine that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal.
Preferably, if the ratio of the current changing rate of the current changing rate of described passage and the rest channels adjacent with described passage is less than or equal to default current following variation coefficient, described method also comprises:
Add up current following variation coefficient in the rest channels adjacent with described passage and be greater than the number of channels of described default current following variation coefficient;
If described quantity is less than predetermined number, then determine that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal.
Preferably, after determining that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal, described method also comprises: the abnormal class determining described operating state according to the current value of described passage, and sends corresponding alarm signal according to described abnormal class.
Preferably, the described current value according to described passage determines the abnormal class of described operating state, and send corresponding alarm signal according to described abnormal class, comprise: compared with null value alarm threshold, lower current limit threshold value and upper current limit threshold value respectively by the current value of described passage, described lower current limit threshold value is greater than described null value alarm threshold and is less than described upper current limit threshold value;
If the current value of described passage is less than described null value alarm threshold, then determines that the abnormal class of described operating state is that null value is reported to the police, and send null value alarm signal;
If the current value of described passage is greater than described null value alarm threshold and be less than described lower current limit threshold value, then determine that the abnormal class of described operating state is that electric current low value is out-of-limit, and send electric current low value off-limit alarm signal;
If the current value of described passage is greater than described upper current limit threshold value, then determine that the abnormal class of described operating state is that electric current high level is out-of-limit, and send electric current high level off-limit alarm signal.
On the other hand, provide a kind of working state monitoring system of solar photovoltaic power plant, described solar photovoltaic power plant comprises at least one solar-energy photo-voltaic cell array, described solar-energy photo-voltaic cell array comprises multiple solar cell string and has the header box of multiple passage, one end of each described passage is connected with a solar cell string or upper level header box, the other end of each described passage is all connected with next stage header box or inverter, and described system comprises:
Current detection module, for detecting the current value of each described passage in real time;
First computing module, for according to described current value calculating current rate of change;
Intensity of sunshine detection module, for detecting the intensity of sunshine of each described passage 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;
Determination module, for determining the operating state of solar cell string or the upper level header box be connected with described passage according to described ratio.
Preferably, described determination module comprises:
First determining unit, for when described ratio is not in predetermined threshold value interval, determines that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal;
Computing unit, for when described ratio is in predetermined threshold value interval, calculates the ratio of the current changing rate of described passage and the current changing rate of the rest channels adjacent with described passage;
Second determining unit, for when the ratio of the current changing rate of described passage and the current changing rate of the rest channels adjacent with described passage is greater than default current following variation coefficient, determine that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal.
Preferably, described determination module also comprises:
Statistic unit, is greater than the number of channels of described default current following variation coefficient for adding up current following variation coefficient in the rest channels adjacent with described passage; 3rd determining unit, for when described quantity is less than predetermined number, determines that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal.
Preferably, described system also comprises:
Classification alarm module, after determining that at described determination module the operating state of solar cell string or the upper level header box be connected with described passage is abnormal, determine the abnormal class of described operating state according to the current value of described passage, and send corresponding alarm signal according to described abnormal class.
Preferably, described classification alarm module comprises:
Comparing unit, for being compared with null value alarm threshold, lower current limit threshold value and upper current limit threshold value respectively by the current value of described passage, described lower current limit threshold value is greater than described null value alarm threshold and is less than described upper current limit threshold value;
Classification alarm unit, for when the current value of described passage is less than described null value alarm threshold, determines that the abnormal class of described operating state is that null value is reported to the police, and sends null value alarm signal; Be greater than described null value alarm threshold at the current value of described passage and be less than described lower current limit threshold value, determining that the abnormal class of described operating state is that electric current low value is out-of-limit, and sending electric current low value off-limit alarm signal; When the current value of described passage is greater than described upper current limit threshold value, determine that the abnormal class of described operating state is that electric current high level is out-of-limit, and send electric current high level off-limit alarm signal.
The work state monitoring method of the solar photovoltaic power plant that the embodiment of the present invention provides and system, by detecting the current value of each passage in real time, and according to current value calculating current rate of change, the intensity of sunshine of each passage of real-time detection, and calculate intensity of sunshine rate of change according to intensity of sunshine, then the operating state of solar cell string or the upper level header box be connected with passage is determined according to current changing rate and the ratio of intensity of sunshine rate of change, due to by the generation current detected in real time data with can reflect that the intensity of sunshine data of ambient conditions combine and monitor, the erroneous judgement that dependence and the external interference of historical data are caused can be reduced, thus effectively improve monitoring accuracy.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the present invention, for those of ordinary skill in the art, other accompanying drawing can also be obtained according to these accompanying drawings.
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 flow chart of the work state monitoring method of a kind of solar photovoltaic power plant that the embodiment of the present invention provides;
Fig. 3 is the flow chart of the work state monitoring method of the second solar photovoltaic power plant that the embodiment of the present invention provides;
Fig. 4 is the flow chart of the work state monitoring method of the third solar photovoltaic power plant that the embodiment of the present invention provides;
Fig. 5 is the flow chart of the work state monitoring method of the 4th kind of solar photovoltaic power plant that the embodiment of the present invention provides;
Fig. 6 is the structural representation of the working state monitoring system of a kind of solar photovoltaic power plant that the embodiment of the present invention provides;
Fig. 7 is the structural representation of the working state monitoring system of the second solar photovoltaic power plant that the embodiment of the present invention provides;
Fig. 8 is the structural representation of the working state monitoring system of the third solar photovoltaic power plant that the embodiment of the present invention provides;
Fig. 9 is the structural representation of the working state monitoring system of the 4th kind of solar photovoltaic power plant that the embodiment of the present invention provides;
Figure 10 is the structural representation of the working state monitoring system of the 5th kind of solar photovoltaic power plant that the embodiment of the present invention provides.
Embodiment
In order to the scheme making those skilled in the art person understand the embodiment of the present invention better, below in conjunction with drawings and embodiments, the embodiment of the present invention is described in further detail.
Embodiments provide a kind of work state monitoring method of solar photovoltaic power plant, wherein, solar photovoltaic power plant comprises at least one solar-energy photo-voltaic cell array, solar-energy photo-voltaic cell array comprises multiple solar cell string and has the header box of multiple passage, one end of each passage is connected with a solar cell string or upper level header box, and the other end of each passage is all connected with next stage header box or inverter.As shown in Figure 1, be a part for a kind of solar photo-voltaic power generation station that the embodiment of the present invention provides, namely illustrate only two-stage and to conflux the part of photovoltaic array of composition, in actual applications, this photovoltaic array can continue increase and to conflux rank.In the present embodiment, in photovoltaic array, assembly connecting mode is: x (x >=1) solar panel forms a solar cell string, the one-level adopting n to enter 1 is confluxed, passage 1 to the passage n ganging up same one-level header box by n solar cell confluxes, the secondary simultaneously adopting m to enter 1 again confluxes, the electric current exported by the passage of m one-level header box is confluxed by passage 1 to the passage m of same secondary header box, and finally unification is exported by the passage of secondary header box.I represents the current value of each passage input of header box.I represents the output current value of header box passage.N represents the maximum solar cell string quantity that one-level header box can access, as being 8 enter 1 one-level header box for model, there are at most 8 passages, accessible at most 8 solar cell strings, it is different that the one-level header box different when reality uses actually may access solar cell string quantity when exact arrangement, as Z1-H1 header box reality is only connected to 7 expanding channels solar cell strings, Z1-H2 header box is actual is connected with 6 input solar cell strings.M represent secondary header box connect the maximum branch road quantity that can access, as being 10 enter 1 secondary header box for model, having at most 10 passages, the passage of 10 one-level header boxs can be connected at most.If one-level header box is 8 models entering, so this 10 electric current entering each passage of secondary header box of 1 output that will be an one-level header box, be 8 solar cell crosstalk streams and, the output current of whole secondary header box be at most 80 solar cell crosstalk streams and.The solar cell string quantity difference that the secondary header box different when reality uses may actually access when exact arrangement, as Z1 header box reality is only connected to 9 one-level header boxs, the passage 1 of Z1 header box connects the passage of Z1-H1 header box, the passage 2 of Z1 header box connects the passage of Z1-H2 header box, the like.Or except being connected with one-level header box, also there is the passage directly connecting solar cell string in Z1 header box.That is, for one-level header box Z1-H1 to Z1-Hm, in n passage of one-level header box, multiple or whole passage and solar cell are contacted and are connect, and allow one-level header box to there is vacant passage; And for secondary header box Z1, have at least other passage of expanding channels of a passage and one-level header box can contact with solar cell to connect, or as shown in Figure 1 secondary header box all with passage 1 to passage m be connected with one-level header box Z1-H1 to Z1-Hm respectively, and allow to there is vacant passage.The header box of higher level the like until N level (N is integer and N >=2).
In the photovoltaic array that in the present embodiment, solar power station adopts, each subcircuits of header box at different levels has following relation:
1, for one-level header box: for Z1-H1 header box, the electric current of its passage and the current value of passage have following relation: I
zI-H1=i
11+ i
12++ i
1n.Z1-H1 header box has n passage, and each passage only connects a string solar cell string, so the current value of its each passage be exactly separately connect the electric current of solar cell string, that is: i
passage 1=i
11.
2, for secondary header box: for Z1 header box, the current value of its passage and the current value of passage have following relation: I
zI=i
1+ i
2++ i
m.Wherein, i
1for the input current value of the passage 1 of secondary header box Z1, this current value equals the output current value I of the passage of one-level header box Z1-H1
zI-H1, i
2to i
mthe like.Z1 header box has m passage, each passage connects an one-level header box, so the current value of each passage of secondary header box Z1 is exactly the current value of the passage of the one-level header box connected separately, be actually n solar cell crosstalk flow valuve with, that is: the i of secondary header box
passage 1=i
1=I
zI-H1=i
11+ i
12++ i
1n, i
passage m=i
m=I
zI-Hm=i
m1+ i
m2++ i
mn.And if both there is the passage directly connecting solar cell string in Z1 header box, also there is the passage connecting one-level header box, then the current value of the passage of Z1 header box equals the current value sum of the current value of the solar cell string be directly connected with it and the passage of each one-level header box.
For the header box of the higher level of N > 2, account form the like, no longer describe in detail herein.The electric current of the passage of N level header box, through the access grid-connected point of inverter, enters power supply grid.
When header box normally works, easily detect the current value of each passage of header box, because the passage of each passage with a solar cell string or higher level's header box is connected, therefore, the current value reality of each passage is also the current value flowing through solar cell string or the higher level's header box be connected with this header box.
Due to the basic comprising unit that solar cell is solar photovoltaic power plant, a solar cell string is formed by after multiple solar cell series connection, for different solar photovoltaic power plants, the arrangement mode of photovoltaic array may have relatively big difference, because the quantity of solar-energy photo-voltaic cell string is more, one or more header box can be adopted to be confluxed by the energy output of solar cell string, therefore, ensureing that each solar cell string and header box can normally work is the prerequisite ensureing that solar photovoltaic power plant normally works.
As shown in Figure 2, this monitoring method comprises:
Step 101: the current value detecting each passage in real time, and according to current value calculating current rate of change.
When passage normally works, easily detect the current value of each passage, because each passage is connected with a solar cell string or higher level's header box, therefore, this current value reality is also the current value flowing through solar cell string or the higher level's header box be connected with this passage, and wherein, current changing rate is the abbreviation of current value rate over time, after detecting the current value in two moment respectively, those skilled in the art easily calculate current changing rate.
Step 102: the intensity of sunshine detecting each passage in real time, and calculate intensity of sunshine rate of change according to described intensity of sunshine.
Above-mentioned intensity of sunshine is also referred to as amplitude at sunshine, for certain solar cell string, from t
0moment is to the intensity of sunshine rate of change=(intensity of sunshine of t
(t)-intensity of sunshine
(t0))/intensity of sunshine
(t0).Rate of change can reflect the situation of change at sunshine in a period of time.By the intensity of sunshine data of each passage of Real-Time Monitoring, more real environmental data can not only be gathered, also do not need with reference to history gas phase data or buy special gas phase data, effectively reducing purchase cost, and make present embodiment have stronger exploitativeness.
Step 103: the ratio of calculating current rate of change and intensity of sunshine rate of change.
Step 104: the operating state determining solar cell string or the upper level header box be connected with passage according to ratio.
Current changing rate is obtained by step 101, after obtaining intensity of sunshine rate of change by step 102, easily calculate the ratio of current changing rate and intensity of sunshine rate of change, the operating state of solar cell string or the upper level header box be connected with passage is determined according to this ratio, due to real-time generation current data are combined with environmental data, even if be subject to object at solar cell string or header box to block or under the cloud of sailing the situation such as to block, also can obtain monitoring result accurately, thus effectively improve monitoring accuracy; In addition, owing to detecting intensity of sunshine situation of change in real time, more reflect true environment situation, history meteorological data can not be relied on, 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 perform step 101, also first can perform step 102, and can also perform step 101 and step 102, the embodiment of the present invention is not specifically limited simultaneously.
As shown in Figure 3, above-mentioned steps 104 determines the operating state of solar cell string or the upper level header box be connected with passage according to the ratio that step 103 calculates, and comprising:
Step 201: judge this ratio whether not in predetermined threshold value interval, if so, then performs step 202: determine that the operating state of solar cell string or the upper level header box be connected with passage is abnormal; Otherwise the method is further comprising the steps of:
Step 203: the ratio calculating the current changing rate of passage and the current changing rate of the rest channels adjacent with passage;
Step 204: judge whether the ratio of the current changing rate of passage and the current changing rate of the rest channels adjacent with passage is greater than default current following variation coefficient;
If so, then step 202 is performed: determine that the operating state of solar cell string or the upper level header box be connected with passage is abnormal.
As shown in Figure 4, if the ratio of the current changing rate of the current changing rate of passage and the rest channels adjacent with passage is less than or equal to default current following variation coefficient, said method also comprises:
Step 301: add up current following variation coefficient in the rest channels adjacent with described passage and be greater than the number of channels of described default current following variation coefficient;
Wherein, current following variation coefficient in step 301 refers to the ratio of the current changing rate of this passage and the current changing rate of the rest channels adjacent with this passage, described passage in step 301 refers in step 204 as the passage judging object, also namely, be as the adjacency channel of passage judging object in step 204 as " this passage " of objects of statistics herein.
Step 302: judge whether the number of channels added up is less than predetermined number; If so, then step 202 is performed: determine that the operating state of solar cell string or the upper level header box be connected with passage is abnormal.
As shown in Figure 5, after the operating state of the solar cell string determining to be connected with passage or upper level header box is abnormal, said method also comprises:
Step 401: according to the abnormal class of the current value determination operating state of passage, and send corresponding alarm signal according to abnormal class.
In order to be described in detail to the embodiment of the present invention, first provide the definition of several base quantity below, and in conjunction with base quantity further to a preferred embodiment of the present invention will be described in detail.
(1) channel current: the actual current value referring to each passage of header box;
(2) warning remote signalling amount: carry out internal calculation according to gathered analog signals, exports digital remote signalling amount (0 or 1), and different digital remote signalling amounts represents different implications;
(3) whether null value is reported to the police: be zero according to channel current, determine whether to send alarm signal, " 0 " represents this passage institute connected components and does not work, 1 to represent this passage institute connected components in running order, wherein, assembly mainly comprises the solar cell string be made up of multiple solar cell;
(4) electric current low value is out-of-limit: represent that channel current is in the minimizing by a relatively large margin of current time generation current value, " 0 " represents this passage institute connected components electric current and almost do not change, and is in normal operating conditions; " 1 " represents this passage 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 channel current is in the increase by a relatively large margin of current time generation current value, " 0 " represents this passage institute connected components electric current and almost do not change, and is in normal operating conditions; " 1 " represents this passage institute connected components electric current and occurs to change by a relatively large margin, is in abnormal working position;
Below respectively 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:
(3) null value is reported to the police:
In embodiments of the present invention, by judging whether channel current value is 0, can judge whether passage normally works.If in same header box institute connected components, any one passage is stable exports generation current, and the some channel current values be under this header box are 0, then this current value be 0 passage send " null value warning ", thus remind this passage place to there is fault.Because some passage of same header box normally works; illustrate that weather condition possesses power generation conditions at that time; and now the channel current of certain passage is " 0 "; the all solar cell strings connect under this passage is described all do not generate electricity, and belong to abnormal conditions, its reason is varied certainly; protection fuse as organized string series connection damages or in group string, certain assembly damages; or this group is serially connected with problem etc., concrete fault be discharged, need to detect assembly further.
Specifically can according to actual needs, arrange the condition that null value is reported to the police, such as, can arrange when channel current meets the following conditions, the condition sending " null value warning " signal (i.e. remote signalling amount set) is:
(1) arrange an adjustable null value warning initiation value effective value q, when in same header box, a branch current is greater than q arbitrarily, null value warning function just comes into operation;
(2) arrange an adjustable null value to report to the police effective thresholding g, when the electric current that any one group is ganged up is less than g, being considered as this branch current is 0, sends " null value warning ".
In embodiments of the present invention, due under normal circumstances, photovoltaic module exports relatively stable, do not have fixing operating current, output current changes with the change of irradiation (intensity of sunshine), under normal circumstances, the irradiation of sunlight is steady and continuous change, and affects by diffusion etc., and transition can not occur, therefore, under normal circumstances, group crosstalk stream is relatively stable, can not suddenly change, when having fault or damaging, will there is significant change in its output current.Therefore, can judge whether group string normally works by test set string real-time current variable quantity.
Out-of-limit for (4) electric current low value:
Judge whether that channel current is undergone mutation exceeded normal limit by comparing the variable quantity of current value within the time arranged, judged whether group string normally works.If when having multichannel that the larger transition of electric current occurs in same header box simultaneously, now think that exception does not appear in the solar cell string that is connected with passage or header box, and may be have object to block or cloud is sailed and caused, now, do not send abnormal alarm signal.
When channel current meets the following conditions, send " electric current low value is out-of-limit " and report to the police, namely electric current low value out-of-limit remote signalling amount set (putting 1) condition is:
(1) arrange sunshine amplitude to follow variation coefficient R1 and calculate changes in amplitude rate at current sunshine, if sunshine, changes in amplitude rate was negative value, and sunshine changes in amplitude rate and the absolute value of ratio of channel current rate of change exceed set amplitude at sunshine and follow variation coefficient, so the out-of-limit coefficient of electric current high level puts 1; Known in conjunction with the changes in amplitude coefficient at sunshine in (4) and (5), when ratio is not in predetermined threshold value interval, then determine that the operating state of solar cell string or the upper level header box be connected with passage is abnormal, according to sunshine amplitude change rate positive and negatively can determine that low value is out-of-limit or high level is out-of-limit.
(2) genetic coefficient S (integer is simultaneously set, represent circumferential passages comparison range), arrange and compare passage and follow variation coefficient B1, calculate the ratio of these other channel current rates of change parameatal, when this ratio exceed set passage follow variation coefficient time, the out-of-limit coefficient of electric current high level puts 1.
(3) the out-of-limit coefficient l of electric current low value (also becoming lower current limit threshold value) is set: namely during the l times of channel current variable quantity lower than electric current, sends " electric current low value is out-of-limit " and report to the police.
As (i
n (0)-i
n (t)) <I
min=li
n (0), the off-limit alarm of output current low value; Wherein, l is electric current low value limit coefficient, l ∈ (0,1), this variable is by background maintenance software design patterns, and with monitoring backstage real time communication, n is integer, represent certain loop in header box, n is port number to the maximum, and t is certain loop, timer periods, this variable is by background maintenance software design patterns, and adjustable range is carried out difference according to disparity items and arranged.
Out-of-limit for (5) electric current high level:
Judging whether that channel current is undergone mutation by comparing the variable quantity of current value within the time arranged, having exceeded normal limit, judged whether group string normally works.
When channel current meets the following conditions, send " electric current high level is out-of-limit " and report to the police, namely the out-of-limit remote signalling amount of the electric current high level condition of 1 of putting is:
(1) changes in amplitude rate at current sunshine is calculated, if sunshine changes in amplitude rate be on the occasion of, and sunshine changes in amplitude rate and the absolute value of ratio of channel current rate of change exceed set amplitude at sunshine and follow variation coefficient R2, so the out-of-limit coefficient of electric current high level puts 1;
(2) arrange and compare passage and follow variation coefficient B2, calculate the ratio of these other channel current rates of change parameatal, when this ratio exceed set passage follow variation coefficient time, the out-of-limit coefficient of electric current low value puts 1.
(3) the out-of-limit coefficient h of electric current high level (also referred to as upper current limit threshold value) is set: namely during the h times of channel current variable quantity higher than electric current, outputting alarm remote signalling.
As (i
n (t)-i
n (0)) >I
max=hi
n (0), output current high level Threshold Crossing Alert remote signalling, wherein, h is electric current high level limit coefficient, h ∈ (0,1), this variable, by background maintenance software design patterns, has read-write window, can be directly downloaded in equipment by 485 order wires, and not needing programming program again, n is integer, represents certain loop in header box, n is actual circuitry number to the maximum, and t is certain loop, timer periods, this variable is by background maintenance software design patterns, and adjustable range is carried out difference according to disparity items and arranged.
The work state monitoring method of the solar photovoltaic power plant that the embodiment of the present invention provides, by detecting the current value of each passage in real time, and according to current value calculating current rate of change, the intensity of sunshine of each passage of real-time detection, and calculate intensity of sunshine rate of change according to intensity of sunshine, then the operating state of solar cell string or the upper level header box be connected with passage is determined according to current changing rate and the ratio of intensity of sunshine rate of change, due to by the generation current detected in real time data with can reflect that the intensity of sunshine data of ambient conditions combine and monitor, the erroneous judgement that dependence and the external interference of historical data are caused can be reduced, thus 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, as shown in Figure 6, wherein, solar photovoltaic power plant comprises at least one solar-energy photo-voltaic cell array, and solar-energy photo-voltaic cell array comprises multiple solar cell string and has the header box of multiple passage, and one end of each passage is connected with a solar cell string or upper level header box, the other end of each passage is all connected with next stage header box or inverter, and this system comprises:
Current detection module 501, for detecting the current value of each passage in real time;
First computing module 502, for described current value calculating current rate of change;
Intensity of sunshine detection module 503, for detecting the intensity of sunshine of each passage in real time;
Second computing module 504, for calculating intensity of sunshine rate of change according to intensity of sunshine;
3rd computing module 505, for the ratio of calculating current rate of change and intensity of sunshine rate of change;
Determination module 506, for determining the operating state of solar cell string or the upper level header box be connected with passage according to ratio.
As shown in Figure 7, above-mentioned determination module 506 comprises:
First determining unit 601, for when ratio is not in predetermined threshold value interval, determines that the operating state of solar cell string or the upper level header box be connected with passage is abnormal;
Computing unit 602, for when ratio is in predetermined threshold value interval, calculates the ratio of the current changing rate of passage and the current changing rate of the rest channels adjacent with passage;
Second determining unit 603, for when the ratio of the current changing rate of passage and the current changing rate of the rest channels adjacent with passage is greater than default current following variation coefficient, determine that the operating state of solar cell string or the upper level header box be connected with passage is abnormal.
As shown in Figure 8, above-mentioned determination module 506 further comprises:
Statistic unit 701, is greater than the number of channels of described default current following variation coefficient for adding up current following variation coefficient in the rest channels adjacent with described passage; 3rd determining unit 702, also for when described quantity is less than predetermined number, determines that the operating state of solar cell string or the upper level header box be connected with passage is abnormal.
As shown in Figure 9, in another embodiment of present system, described system also comprises:
Classification alarm module 801, after determining that at determination module the operating state of solar cell string or the upper level header box be connected with passage is abnormal, according to the abnormal class of the current value determination operating state of passage, and send corresponding alarm signal according to abnormal class.
As shown in Figure 10, a kind of concrete structure of above-mentioned classification alarm module 801 comprises:
Comparing unit 901, for being compared with null value alarm threshold, lower current limit threshold value and upper current limit threshold value respectively by the current value of passage, wherein, lower current limit threshold value is greater than null value alarm threshold and is less than upper current limit threshold value;
Classification alarm unit 902, for when the current value of passage is less than null value alarm threshold, determines that the abnormal class of operating state is that null value is reported to the police, and sends null value alarm signal; Be greater than null value alarm threshold at the current value of passage and be less than lower current limit threshold value, determining that the abnormal class of operating state is that electric current low value is out-of-limit, and sending electric current low value off-limit alarm signal; When the current value of passage is greater than upper current limit threshold value, determine that the abnormal class of operating state is that electric current high level is out-of-limit, and send electric current high level off-limit alarm signal.
Certainly, classification alarm module 801 is not limited to said structure, can also need other specific implementation structure, do not limit this embodiment of the present invention according to practical application.
The working state monitoring system of the solar photovoltaic power plant that the embodiment of the present invention provides, by detecting the current value of each passage in real time, and according to current value calculating current rate of change, the intensity of sunshine of each passage of real-time detection, and calculate intensity of sunshine rate of change according to intensity of sunshine, then the operating state of solar cell string or the upper level header box be connected with passage is determined according to current changing rate and the ratio of intensity of sunshine rate of change, due to by the generation current detected in real time data with can reflect that the intensity of sunshine data of ambient conditions combine and monitor, the erroneous judgement that dependence and the external interference of historical data are caused can be reduced, thus effectively improve monitoring accuracy.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.System embodiment described above is only schematic, the wherein said module that illustrates as separating component or unit or can may not be and physically separate, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple unit.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the work state monitoring method of a solar photovoltaic power plant, described solar photovoltaic power plant comprises at least one solar-energy photo-voltaic cell array, described solar-energy photo-voltaic cell array comprises multiple solar cell string and has the header box of multiple passage, one end of each described passage is connected with a solar cell string or upper level header box, the other end of each described passage is all connected with next stage header box or inverter, it is characterized in that, described method comprises:
The current value of each described passage of real-time detection, and according to described current value calculating current rate of change;
The intensity of sunshine of each described passage of real-time detection, and calculate intensity of sunshine rate of change according to described intensity of sunshine;
Calculate the ratio of described current changing rate and described intensity of sunshine rate of change, and determine the operating state of solar cell string or the upper level header box be connected with described passage according to described ratio.
2. the work state monitoring method of solar photovoltaic power plant according to claim 1, it is characterized in that, describedly determine that the operating state of solar cell string or the upper level header box be connected with described passage comprises according to described ratio: if described ratio is not in predetermined threshold value interval, then determine that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal; Otherwise described method also comprises:
Calculate the ratio of the current changing rate of described passage and the current changing rate of the rest channels adjacent with described passage;
If the ratio of the current changing rate of the current changing rate of described passage and the rest channels adjacent with described passage is greater than default current following variation coefficient, then determine that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal.
3. the work state monitoring method of solar photovoltaic power plant according to claim 2, it is characterized in that, if the ratio of the current changing rate of the current changing rate of described passage and the rest channels adjacent with described passage is less than or equal to default current following variation coefficient, described method also comprises:
Add up current following variation coefficient in the rest channels adjacent with described passage and be greater than the number of channels of described default current following variation coefficient;
If described quantity is less than predetermined number, then determine that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal.
4. the work state monitoring method of the solar photovoltaic power plant according to any one of claims 1 to 3, it is characterized in that, after determining that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal, described method also comprises: the abnormal class determining described operating state according to the current value of described passage, and sends corresponding alarm signal according to described abnormal class.
5. the work state monitoring method of solar photovoltaic power plant according to claim 4, it is characterized in that, the described current value according to described passage determines the abnormal class of described operating state, and send corresponding alarm signal according to described abnormal class, comprise: compared with null value alarm threshold, lower current limit threshold value and upper current limit threshold value respectively by the current value of described passage, described lower current limit threshold value is greater than described null value alarm threshold and is less than described upper current limit threshold value;
If the current value of described passage is less than described null value alarm threshold, then determines that the abnormal class of described operating state is that null value is reported to the police, and send null value alarm signal;
If the current value of described passage is greater than described null value alarm threshold and be less than described lower current limit threshold value, then determine that the abnormal class of described operating state is that electric current low value is out-of-limit, and send electric current low value off-limit alarm signal;
If the current value of described passage is greater than described upper current limit threshold value, then determine that the abnormal class of described operating state is that electric current high level is out-of-limit, and send electric current high level off-limit alarm signal.
6. the working state monitoring system of a solar photovoltaic power plant, described solar photovoltaic power plant comprises at least one solar-energy photo-voltaic cell array, described solar-energy photo-voltaic cell array comprises multiple solar cell string and has the header box of multiple passage, one end of each described passage is connected with a solar cell string or upper level header box, the other end of each described passage is all connected with next stage header box or inverter, it is characterized in that, described system comprises:
Current detection module, for detecting the current value of each described passage in real time;
First computing module, for according to described current value calculating current rate of change;
Intensity of sunshine detection module, for detecting the intensity of sunshine of each described passage 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;
Determination module, for determining the operating state of solar cell string or the upper level header box be connected with described passage according to described ratio.
7. the working state monitoring system of solar photovoltaic power plant according to claim 6, is characterized in that, described determination module comprises:
First determining unit, for when described ratio is not in predetermined threshold value interval, determines that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal;
Computing unit, for when described ratio is in predetermined threshold value interval, calculates the ratio of the current changing rate of described passage and the current changing rate of the rest channels adjacent with described passage;
Second determining unit, for when the ratio of the current changing rate of described passage and the current changing rate of the rest channels adjacent with described passage is greater than default current following variation coefficient, determine that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal.
8. the working state monitoring system of solar photovoltaic power plant according to claim 7, is characterized in that, described determination module also comprises:
Statistic unit, is greater than the number of channels of described default current following variation coefficient for adding up current following variation coefficient in the rest channels adjacent with described passage;
3rd determining unit, for when described quantity is less than predetermined number, determines that the operating state of solar cell string or the upper level header box be connected with described passage is abnormal.
9. the working state monitoring system of the solar photovoltaic power plant according to any one of claim 6 to 8, is characterized in that, described system also comprises:
Classification alarm module, after determining that at described determination module the operating state of solar cell string or the upper level header box be connected with described passage is abnormal, determine the abnormal class of described operating state according to the current value of described passage, and send corresponding alarm signal according to described abnormal class.
10. the working state monitoring system of solar photovoltaic power plant according to claim 9, is characterized in that, described classification alarm module comprises:
Comparing unit, for being compared with null value alarm threshold, lower current limit threshold value and upper current limit threshold value respectively by the current value of described passage, described lower current limit threshold value is greater than described null value alarm threshold and is less than described upper current limit threshold value;
Classification alarm unit, for when the current value of described passage is less than described null value alarm threshold, determines that the abnormal class of described operating state is that null value is reported to the police, and sends null value alarm signal; Be greater than described null value alarm threshold at the current value of described passage and be less than described lower current limit threshold value, determining that the abnormal class of described operating state is that electric current low value is out-of-limit, and sending electric current low value off-limit alarm signal; When the current value of described passage is greater than described upper current limit threshold value, determine that the abnormal class of described operating state is that electric current high level is out-of-limit, and send electric current high level off-limit alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510209449.3A CN104796083B (en) | 2015-04-28 | 2015-04-28 | A kind of work state monitoring method and system of solar photovoltaic power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510209449.3A CN104796083B (en) | 2015-04-28 | 2015-04-28 | A kind of work state monitoring method and system of solar photovoltaic power plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104796083A true CN104796083A (en) | 2015-07-22 |
| CN104796083B CN104796083B (en) | 2017-04-05 |
Family
ID=53560651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510209449.3A Active CN104796083B (en) | 2015-04-28 | 2015-04-28 | A kind of work state monitoring method and system of solar photovoltaic power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104796083B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115208303A (en) * | 2022-09-14 | 2022-10-18 | 山西超维科技有限公司 | Photovoltaic power generation system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060237058A1 (en) * | 2005-04-25 | 2006-10-26 | Mcclintock Ronald B | Direct current combiner box with power monitoring, ground fault detection and communications interface |
| WO2012161338A1 (en) * | 2011-05-26 | 2012-11-29 | 日清紡メカトロニクス株式会社 | Solar simulator, solar cell characteristic measurement method, and program |
| CN103701410A (en) * | 2013-12-31 | 2014-04-02 | 阳光电源股份有限公司 | Photovoltaic group string fault identifying method, device and system |
| CN103715983A (en) * | 2013-12-26 | 2014-04-09 | 广东易事特电源股份有限公司 | Device and method for detecting faults of solar power generation system |
| TW201425949A (en) * | 2012-12-25 | 2014-07-01 | Ind Tech Res Inst | Fault diagnosis system and method of fault diagnosis |
| CN104283512A (en) * | 2014-10-28 | 2015-01-14 | 上海许继电气有限公司 | Method for remotely monitoring and locating faults of set strings in photovoltaic power station system |
-
2015
- 2015-04-28 CN CN201510209449.3A patent/CN104796083B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060237058A1 (en) * | 2005-04-25 | 2006-10-26 | Mcclintock Ronald B | Direct current combiner box with power monitoring, ground fault detection and communications interface |
| WO2012161338A1 (en) * | 2011-05-26 | 2012-11-29 | 日清紡メカトロニクス株式会社 | Solar simulator, solar cell characteristic measurement method, and program |
| TW201425949A (en) * | 2012-12-25 | 2014-07-01 | Ind Tech Res Inst | Fault diagnosis system and method of fault diagnosis |
| CN103715983A (en) * | 2013-12-26 | 2014-04-09 | 广东易事特电源股份有限公司 | Device and method for detecting faults of solar power generation system |
| CN103701410A (en) * | 2013-12-31 | 2014-04-02 | 阳光电源股份有限公司 | Photovoltaic group string fault identifying method, device and system |
| CN104283512A (en) * | 2014-10-28 | 2015-01-14 | 上海许继电气有限公司 | Method for remotely monitoring and locating faults of set strings in photovoltaic power station system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115208303A (en) * | 2022-09-14 | 2022-10-18 | 山西超维科技有限公司 | Photovoltaic power generation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104796083B (en) | 2017-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104767481A (en) | Method and system for monitoring working state of solar photovoltaic power station | |
| CN104779913A (en) | Method and system for monitoring working state of solar photovoltaic power station | |
| CN104779911A (en) | Method and system for monitoring working state of solar photovoltaic power station | |
| CN104601108A (en) | Small photovoltaic power station fault diagnosis method | |
| EP2381094B1 (en) | Energy network and control thereof | |
| CN104779909A (en) | Method and system for monitoring working state of solar photovoltaic power station | |
| CN104506137A (en) | Equipment fault diagnosis method and apparatus | |
| CN104796083A (en) | Solar photovoltaic plant operating state monitoring method and system | |
| CN104779908A (en) | Method and system for monitoring working state of solar photovoltaic power station | |
| CN104767480A (en) | Convergence detecting method and system for convergence box and solar power station | |
| CN104779907A (en) | Method and system for monitoring working state of solar photovoltaic power station | |
| Samet et al. | Optimal number and location of the required measurment units for fault detection of pv arrays | |
| CN104779906A (en) | Method and system for monitoring working state of solar photovoltaic power station | |
| CN104779914A (en) | Conflux detection method and system for conflux boxes and solar power station | |
| CN108322186B (en) | Photovoltaic system fault monitoring method and system | |
| CN104796086A (en) | Convergence detection method and system for convergence box and solar power station | |
| CN104767479A (en) | Convergence detecting method and system for convergence box and solar power station | |
| CN216146081U (en) | Photovoltaic power generation data acquisition system | |
| CN104767485A (en) | Convergence detecting method and system for convergence box and solar power station | |
| KR102440143B1 (en) | An apparatus for detecting the shading and failure of solar modules | |
| CN205029333U (en) | Little electric wire netting intelligent protection device based on regional information | |
| CN113824109B (en) | Regional topology network power consumption data consistency accounting method | |
| CN104779912A (en) | Method and system for monitoring working state of solar photovoltaic power station | |
| CN104836528A (en) | Convergence detection method and system for convergence boxes, solar power station | |
| CN209460601U (en) | A kind of distributed micro-capacitance sensor protection system based on the communication of high speed real-time ethernet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160214 Address after: 100176 Beijing economic and Technological Development Zone, Kangding street, No. 11, building three, floor 11 Applicant after: APOLLO PREC KUNMING YUANHONG LTD Address before: 100101 Beijing city Huairou area yangsongzhen Fengxiang East Street, No. 5 Applicant before: Beijing Han Neng photovoltaic Investment Co., Ltd |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201224 Address after: 102206 1611, floor 16, building 5, No. 106, Kexing West Road, Changping District, Beijing Patentee after: Beijing heshengtong Technology Co.,Ltd. Address before: 100176 3rd floor, 11 Kangding Street, Beijing Economic and Technological Development Zone Patentee before: BEIJING APOLLO DING RONG SOLAR TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210319 Address after: 101407 Yanqi Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee after: Dongjun new energy Co.,Ltd. Address before: 102206 1611, floor 16, building 5, No. 106, Kexing West Road, Changping District, Beijing Patentee before: Beijing heshengtong Technology Co.,Ltd. |
|
| TR01 | Transfer of patent right |