CN104779911B - Method and system for monitoring working state of solar photovoltaic power station - Google Patents

Method and system for monitoring working state of solar photovoltaic power station Download PDF

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Publication number
CN104779911B
CN104779911B CN201510209452.5A CN201510209452A CN104779911B CN 104779911 B CN104779911 B CN 104779911B CN 201510209452 A CN201510209452 A CN 201510209452A CN 104779911 B CN104779911 B CN 104779911B
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China
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current
value
passage
threshold value
ratio
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CN201510209452.5A
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Chinese (zh)
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CN104779911A (en
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杨盛楠
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北京铂阳顶荣光伏科技有限公司
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Priority to CN201510209452.5A priority Critical patent/CN104779911B/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00

Abstract

The invention discloses a method and system for monitoring the working state of a solar photovoltaic power station and belongs to the technical field of solar photovoltaic power generation. The solar photovoltaic power station comprises at least one solar photovoltaic cell array. Each solar photovoltaic cell array comprises multiple solar cell strings and combiner boxes provided with multiple channels, one end of each channel is connected with the corresponding solar cell string or the superior combiner box, and the other end of each channel is connected with the next combiner box or an inverter. The method comprises the steps that the current value of each channel is detected in real time, and the current change rate is calculated according to the current values; the sunlight intensity of each channel is detected in real time, and the sunlight intensity change rate is calculated according to the sunlight intensity; the ratio of the current change rate to the sunlight intensity change rate is calculated; whether the ratio is within a preset threshold range or not is judged, and it is determined that the working state of a solar cell string connected with the channel or the working state of the superior combiner box is abnormal if not. The method for monitoring the working state of the solar photovoltaic power station is high in monitoring accuracy.

Description

A kind of work state monitoring method and system of solar photovoltaic power plant

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, the solar panel species that and uses in the industry is various, component parameter aspect differs greatly, for different designs side Case, can also adopt the inverter of multi-form, so that in actual applications according to the difference of project, 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 delimited to the working condition of solar cell string (or referred to as group string) and determine number range, and this just gives The real-time monitoring and fault diagnosis of photovoltaic array brings huge difficulty.Because a group string is solar-energy photo-voltaic cell battle array The basic Component units of row, and whether normal work will directly influence the safety of photovoltaic plant and total of photovoltaic plant 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 shown the different pieces of information of electric quantity signal in the same window, without being directly contrasted knot Really;Also there is the current changing rate that part monitoring system can be in group string being monitored to the working condition of photovoltaic plant, But such as in extraneous appearance interference, 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;

The ratio is judged whether in predetermined threshold value is interval, if it is not, then determining the solar energy being connected with the passage The working condition exception of battery strings or upper level header box.

Preferably, in the working condition exception of the solar cell string or upper level header box for judging to be connected with the passage 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:

The passage is obtained respectively in predetermined time and the current value at current time, calculates the curent change of the passage Amount;

The current change quantity is compared respectively with upper current limit threshold value, lower current limit threshold value, the upper current limit threshold value More than the lower current limit threshold value;

If the current change quantity is more than the upper current limit threshold value, and more than h times of the predetermined time current value, The h is more than 0 and less than 1, it is determined that the abnormal class of the working condition is that electric current high level is out-of-limit, and sends electric current high level and get over Limit alarm signal;

If the current change quantity is less than the lower current limit threshold value, and less than l times of the predetermined time current value, The l is more than 0 and less than 1, it is determined that the abnormal class of the working condition is that electric current low value is out-of-limit, and sends electric current low value and get over Limit 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, also includes:

The current value at the current time is compared with null value alarm threshold, the null value alarm threshold is less than the electric current Lower threshold;

If the current value at the current time of the passage is less than the null value alarm threshold, it is determined that the working condition Abnormal class be that null value is reported to the police, and send null value alarm signal.

Preferably, it is described to judge whether the ratio includes in predetermined threshold value interval:

Judge whether the ratio is positive number, if it is, when the ratio is less than the first predetermined threshold value, judging described Ratio is in predetermined threshold value is interval;Otherwise, when the ratio is more than the second predetermined threshold value, judge the ratio in predetermined threshold value In interval;First predetermined threshold value is positive number, and second predetermined threshold value is negative.

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 is 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;

Judge module, for judging the ratio whether in predetermined threshold value is interval;

Determining module, for after the judge module judges the ratio not in predetermined threshold value is interval, it is determined that and institute State the working condition exception of the connected solar cell string of passage or 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 level header box working condition exception, the abnormal class of the working condition is determined according to the current value of the passage, and according to The abnormal class sends corresponding alarm signal.

Preferably, the classification alarm module, including:

Acquiring unit, for obtaining the passage respectively in predetermined time and the current value at current time;

First computing unit, for calculating the current change quantity of the passage;

First comparing unit, for the current change quantity to be compared respectively with upper current limit threshold value, lower current limit threshold value, The upper current limit threshold value is more than the lower current limit threshold value;

First classification alarm unit, for being more than the upper current limit threshold value in the current change quantity, and more than described When h times of predetermined time current value, more than 0 and less than 1, the abnormal class for determining the working condition is electric current high level to the h It is out-of-limit, and send electric current high level off-limit alarm signal;The lower current limit threshold value is less than in the current change quantity, and less than institute When stating l times of predetermined time current value, l more than 0 and less than 1, for electric current low value get over by the abnormal class for determining the working condition Limit, and send electric current low value off-limit alarm signal.

Preferably, the classification alarm module, also includes:

Second comparing unit, for the current value at the current time to be compared with null value alarm threshold, the null value report Alert thresholding is less than the lower current limit threshold value;

Second classification alarm unit, for being less than the null value alarm threshold in the current value at the current time of the passage When, the abnormal class for determining the working condition is null value warning, and sends null value alarm signal.

Preferably, the judge module includes:

First judging unit, for judging whether the ratio is positive number;

Second judging unit, for after first judging unit judges the ratio for positive number, judging the ratio Whether the first predetermined threshold value is less than, if it is, judging the ratio in predetermined threshold value is interval;

Second judging unit, is additionally operable to after first judging unit judges the ratio not for positive number, judges Whether the ratio is more than the second predetermined threshold value, if it is, judging the ratio in predetermined threshold value is interval;Described first is pre- If threshold value is positive number, second predetermined threshold value is negative.

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, then the ratio of calculating current rate of change and intensity of sunshine rate of change, if ratio Not in predetermined threshold value is interval, it is determined that the solar cell string being connected with passage or the working condition of upper level header box are different Often, supervised due to the generation current data of real-time detection being combined with the intensity of sunshine data that can reflect ambient conditions Survey, the erroneous judgement that the dependence to historical data and external interference cause can be reduced, 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 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. 5 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. 6 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. 7 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;

Fig. 8 is that 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 is shown It is intended to.

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 include 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 is 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.Assembly connecting mode is in photovoltaic array in the present embodiment: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 enter two grades of 1 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 two grades of header boxs and connects the maximum that can be accessed 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 may be accessed actually 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 connects 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 connect with solar cell series winding, and allow 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 respectively to passage m, and allows the presence of vacant passage.The header box of higher level The like until N levels (N is integer and N >=2).

There is with ShiShimonoseki each subcircuits of header boxs at different levels in the photovoltaic array that solar power station is adopted in the present embodiment 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.

Because 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, because 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 rate of change is calculated according to intensity of sunshine.

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 reference 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:Judge ratio whether in predetermined threshold value is interval, and judge ratio not in predetermined threshold value it is interval after, Execution step 105:It is determined that the working condition exception of the solar cell string being connected with passage or upper level header box.

Current changing rate is obtained by step 101, obtains after intensity of sunshine rate of change, easily calculating by step 102 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 Whether the working condition of upper level header box, specifically, judge the ratio of current changing rate and intensity of sunshine rate of change pre- If in threshold interval, if it is not, then determining that the working condition of the solar cell string or upper level header box being connected with passage is different Often.Due to by real-time generation current data in combination with environmental data, even if being subject to thing in solar cell string or header box It is accurate so as to effectively improve monitoring when body is blocked or the cloud sailed is blocked, it is also possible to obtain accurate monitoring result True rate;Further, since real-time detection intensity of sunshine situation of change, can more reflect true environment situation, and do not rely on and go through 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 can first 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 is not done It is concrete to limit.

As shown in figure 3, in the working condition exception of the solar cell string or upper level header box for judging to be connected with passage Afterwards, the work state monitoring method of above-mentioned solar photovoltaic power plant also includes:

Step 201: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 above-mentioned current value according to passage determines the abnormal class of working condition, and sends corresponding report according to abnormal class Alert signal, specifically includes:

Respectively Acquisition channel calculates the current change quantity of passage in predetermined time and the current value at current time;

Current change quantity is compared respectively with upper current limit threshold value, lower current limit threshold value, wherein, upper current limit threshold value is more than Lower current limit threshold value;

If current change quantity is more than upper current limit threshold value, and more than h times of predetermined time current value, h is more than 0 and is less than 1, it is determined that the abnormal class of working condition is that electric current high level is out-of-limit, and sends electric current high level off-limit alarm signal;

If current change quantity is less than lower current limit threshold value, and less than l times of predetermined time current value, wherein, l is more than 0 And less than 1, it is determined 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.

The above-mentioned current value according to passage determines the abnormal class of working condition, and sends corresponding report according to abnormal class Alert signal, further comprises:

The current value at current time is compared with null value alarm threshold, null value alarm threshold is less than lower current limit threshold value;

If the current value at the current time of passage is less than null value alarm threshold, it is determined that the abnormal class of working condition is Null value is reported to the police, and sends null value alarm signal.

In order to be described in detail to the embodiment of the present invention, the definition of several fundamental quantities is first provided below, and combine 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:It is whether that zero determining whether to send alarm signal, " 0 " represents the passage according to channel current 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 that battery is constituted;

(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;

Null value is reported to the police individually below, 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 at the passage so as to remind.By In some passage normal works of same header box, illustrate that at that time weather condition possesses power generation conditions, and now certain passage Channel current is " 0 ", illustrates that all solar cell strings connect under the passage do not generate electricity, and belongs to abnormal conditions, and certainly it is former Because of varied, the damage of protection fuse or organize certain component damage in string that such as group is connected, or the group is serially connected with and asks 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 arbitrarily a branch current is big in same header box When q, null value warning function just comes into operation;

(2) the effective thresholding g of the adjustable null value warning of setting one, when the electric current that any one group is ganged up is less than g, is considered as The branch current is 0, is sent " null value warning ".

In embodiments of the present invention, because under normal circumstances, photovoltaic module output is relatively stable, without fixed work electricity Stream, output current changes 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 is judging group string whether normal work.If have multichannel that the larger transition of electric current occurs in same header box simultaneously, 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 with monitoring backstage real-time Communication for Power, n is integer, and representative is confluxed for l ∈ Certain loop in case, n is 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, exceed Normal limit is judging 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 the restriction of 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 In being downloaded to equipment, without programming program again, n is integer, represents certain loop in header box, and n is actual circuitry number to the maximum, T is the timing time in certain loop, and this variable can be carried out not by background maintenance software design patterns, adjustable range according to disparity items With setting.

In embodiments of the present invention, step 104:Judge whether the ratio specifically includes in predetermined threshold value interval:

Judge whether ratio is positive number, if it is, when ratio is less than the first predetermined threshold value, judging ratio in default threshold In value is interval;Otherwise, when ratio is more than the second predetermined threshold value, judge ratio in predetermined threshold value is interval;Wherein, first preset Threshold value is positive number, and the second predetermined threshold value is negative.

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 the ratio of calculating current rate of change and intensity of sunshine rate of change, if ratio is not pre- If in threshold interval, it is determined that the solar cell string being connected with passage or the working condition exception of upper level header box, due to The generation current data of real-time detection are combined with the intensity of sunshine data that can reflect ambient conditions and is monitored, can be subtracted The erroneous judgement that dependence and external interference less to historical data causes, 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. 4 Shown, solar photovoltaic power plant includes at least one solar-energy photo-voltaic cell array, and solar-energy photo-voltaic cell array includes multiple Converge with a solar cell string or upper level solar cell string and the header box with multiple passages, one end of each passage Stream case 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 301, for the current value of each passage of real-time detection;

First computing module 302, for according to current value calculating current rate of change;

Intensity of sunshine detection module 303, for the intensity of sunshine of each passage of real-time detection;

Second computing module 304, for calculating intensity of sunshine rate of change according to intensity of sunshine;

3rd computing module 305, for calculating current rate of change and the ratio of intensity of sunshine rate of change;

Judge module 306, for judging ratio whether in predetermined threshold value is interval;

Determining module 307, for after judge module judges ratio not in predetermined threshold value is interval, it is determined that being connected with passage Solar cell string or upper level header box working condition exception.

As shown in figure 5, said system also includes:Classification alarm module 401, for determining and passage in determining module 307 After connected solar cell string or upper level header box working condition exception, working condition is determined according to the current value of passage Abnormal class, and corresponding alarm signal is sent according to abnormal class.

As shown in fig. 6, above-mentioned classification alarm module 401, including:

Acquiring unit 501, for Acquisition channel respectively in predetermined time and the current value at current time;

First computing unit 502, for calculating the current change quantity of passage;

First comparing unit 503, for current change quantity to be compared respectively with upper current limit threshold value, lower current limit threshold value, Upper current limit threshold value is more than lower current limit threshold value;

First classification alarm unit 504, for being more than upper current limit threshold value in current change quantity, and more than predetermined time electricity When h times of flow valuve, more than 0 and less than 1, the abnormal class for determining working condition is that electric current high level is out-of-limit to h, and sends electric current high level Off-limit alarm signal;Lower current limit threshold value is less than in current change quantity, and during less than l times of predetermined time current value, l is more than 0 And less than 1, the abnormal class for determining working condition is that electric current low value is out-of-limit, and sends electric current low value off-limit alarm signal.

Certainly, above-mentioned classification alarm module 401 is not limited to said structure, can be needing it according to practical application It implements structure, and this embodiment of the present invention is not limited.

As shown in fig. 7, above-mentioned classification alarm module 401, also includes:

Second comparing unit 505, for the current value at current time to be compared with null value alarm threshold, null value alarm threshold Less than lower current limit threshold value;

Second classification alarm unit 506, for the current value at the current time of passage be less than null value alarm threshold when, really The abnormal class for determining working condition is null value warning, and sends null value alarm signal.

As shown in figure 8, above-mentioned judge module 306 includes:

First judging unit 601, for judging whether ratio is positive number;

Second judging unit 602, for after the first judging unit 601 judges ratio for positive number, judging whether ratio is little In the first predetermined threshold value, if it is, judging ratio in predetermined threshold value is interval;

Second judging unit 602, is additionally operable to after the first judging unit 601 judges ratio not for positive number, judges that ratio is It is no to be more than the second predetermined threshold value, if it is, judging ratio in predetermined threshold value is interval;Wherein, the first predetermined threshold value is positive number, Second predetermined threshold value is negative.

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 the ratio of calculating current rate of change and intensity of sunshine rate of change, if ratio is not pre- If in threshold interval, it is determined that the solar cell string being connected with passage or the working condition exception of upper level header box, due to The generation current data of real-time detection are combined with the intensity of sunshine data that can reflect ambient conditions and is monitored, can be subtracted The erroneous judgement that dependence and external interference less to historical data causes, 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, because it 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, can be as the part that unit shows or also may be used Not being physical location, you can with positioned at a place, 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 (8)

1. a kind of work state monitoring method of solar photovoltaic power plant, the solar photovoltaic power plant includes at least one sun Energy photovoltaic battery array, the solar-energy photo-voltaic cell array includes multiple solar cell strings and confluxing with multiple passages Case, one end of each passage is 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;
Calculate the ratio of the current changing rate and the intensity of sunshine rate of change;
The ratio is judged whether in predetermined threshold value is interval, if it is not, then determining the solar cell being connected with the passage The working condition exception of string or upper level header box;
The abnormal class of the working condition is determined according to the current value of the passage, and is sent accordingly according to the abnormal class Alarm signal, including:The current value at current time is compared with null value alarm threshold, the null value alarm threshold is less than electric current Lower threshold;If the current value at the current time of the passage is less than the null value alarm threshold, it is determined that the work shape The abnormal class of state is null value warning.
2. the work state monitoring method of solar photovoltaic power plant according to claim 1, 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 passage is obtained respectively in predetermined time and the current value at current time, calculates the current change quantity of the passage;
The current change quantity is compared respectively with upper current limit threshold value, lower current limit threshold value, the upper current limit threshold value is more than The lower current limit threshold value;
If the current change quantity is more than the upper current limit threshold value, and more than h times of the predetermined time current value, it is described H is more than 0 and less than 1, it is determined that the abnormal class of the working condition is that electric current high level is out-of-limit, and sends the out-of-limit report of electric current high level Alert signal;
If the current change quantity is less than the lower current limit threshold value, and less than l times of the predetermined time current value, it is described L is more than 0 and less than 1, it is determined that the abnormal class of the working condition is that electric current low value is out-of-limit, and sends the out-of-limit report of electric current low value Alert signal.
3. the work state monitoring method of solar photovoltaic power plant according to claim 1, it is characterised in that also include:
When it is determined that the abnormal class of the working condition is reported to the police for null value, null value alarm signal is sent.
4. the work state monitoring method of the solar photovoltaic power plant according to any one of claims 1 to 3, its feature exists In described to judge whether the ratio includes in predetermined threshold value interval:
Judge whether the ratio is positive number, if it is, when the ratio is less than the first predetermined threshold value, judging the ratio In predetermined threshold value is interval;Otherwise, when the ratio is more than the second predetermined threshold value, judge that the ratio is interval in predetermined threshold value It is interior;First predetermined threshold value is positive number, and second predetermined threshold value is negative.
5. a kind of working state monitoring system of solar photovoltaic power plant, the solar photovoltaic power plant includes at least one sun Energy photovoltaic battery array, the solar-energy photo-voltaic cell array includes multiple solar cell strings and confluxing with multiple passages Case, one end of each passage is 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;
Judge module, for judging the ratio whether in predetermined threshold value is interval;
Determining module, for after the judge module judges the ratio not in predetermined threshold value is interval, it is determined that logical with described The working condition exception of the connected solar cell string in road or upper level header box;
Classification alarm module, for determining that the solar cell string being connected with the passage or upper level converge in the determining module After stream case working condition exception, the abnormal class of the working condition is determined according to the current value of the passage, and according to described Abnormal class sends corresponding alarm signal;
The classification alarm module includes:
Second comparing unit, for the current value at current time to be compared with null value alarm threshold, the null value alarm threshold is little In lower current limit threshold value;
Second classification alarm unit, for the current value at the current time of the passage be less than the null value alarm threshold when, The abnormal class for determining the working condition is null value warning.
6. the working state monitoring system of solar photovoltaic power plant according to claim 5, it is characterised in that the classification Alarm module, also includes:
Acquiring unit, for obtaining the passage respectively in predetermined time and the current value at current time;
First computing unit, for calculating the current change quantity of the passage;
First comparing unit, it is described for the current change quantity to be compared respectively with upper current limit threshold value, lower current limit threshold value Upper current limit threshold value is more than the lower current limit threshold value;
First classification alarm unit for being more than the upper current limit threshold value and default more than described in the current change quantity When h times of moment current value, more than 0 and less than 1, the abnormal class for determining the working condition is that electric current high level is out-of-limit to the h, And send electric current high level off-limit alarm signal;The lower current limit threshold value is less than in the current change quantity, and it is pre- less than described If when l times of moment current value, more than 0 and less than 1, the abnormal class for determining the working condition is that electric current low value is out-of-limit to l, and Send electric current low value off-limit alarm signal.
7. the working state monitoring system of solar photovoltaic power plant according to claim 5, it is characterised in that described second Classification alarm unit is additionally operable to:
When it is determined that the abnormal class of the working condition is reported to the police for null value, null value alarm signal is sent.
8. the working state monitoring system of the solar photovoltaic power plant according to any one of claim 5 to 7, its feature exists In the judge module includes:
First judging unit, for judging whether the ratio is positive number;
Second judging unit, for after first judging unit judges the ratio for positive number, whether judging the ratio Less than the first predetermined threshold value, if it is, judging the ratio in predetermined threshold value is interval;
Second judging unit, is additionally operable to after first judging unit judges the ratio not for positive number, judges described Whether ratio is more than the second predetermined threshold value, if it is, judging the ratio in predetermined threshold value is interval;Described first default threshold It is worth for positive number, second predetermined threshold value is negative.
CN201510209452.5A 2015-04-28 2015-04-28 Method and system for monitoring working state of solar photovoltaic power station CN104779911B (en)

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