CN107589318A - The method for detecting abnormality and device of inverter in photovoltaic plant - Google Patents
The method for detecting abnormality and device of inverter in photovoltaic plant Download PDFInfo
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- CN107589318A CN107589318A CN201610528804.8A CN201610528804A CN107589318A CN 107589318 A CN107589318 A CN 107589318A CN 201610528804 A CN201610528804 A CN 201610528804A CN 107589318 A CN107589318 A CN 107589318A
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Abstract
The embodiments of the invention provide the method for detecting abnormality and device of inverter in a kind of photovoltaic plant, wherein, methods described includes：Obtain the measurement power output of condition irradiation level and inverter under condition irradiation level corresponding to the inverter in photovoltaic plant；Judge whether the measurement power output of inverter is more than given threshold with the difference of theoretical power output of the inverter under condition irradiation level；If being more than given threshold, abnormal warning information occurs for generation instruction inverter.By the embodiment of the present invention, realize and Efficiency testing timely and effectively is carried out to the inverter in photovoltaic plant, predict its state and carry out early warning, operation and the maintenance efficiency of photovoltaic plant greatly improved.
Description
Technical field
The present invention relates to a kind of method for detecting abnormality of inverter in technical field of photovoltaic power generation, more particularly to photovoltaic plant
With device.
Background technology
With the exhaustion of traditional energy, the sustainable development of social economy, renewable resource becomes particularly important.Wherein, too
Sun can effectively be utilized, thus photovoltaic plant meets the tendency of as the important component of renewable resource by photovoltaic generation
And give birth to.
Photovoltaic plant is formed using solar energy, inverter, using electronic components such as special material crystal silicon plates
Generating system.In photovoltaic plant, photovoltaic module and inverter are important parts, and generally each photovoltaic module is configured with
Some inverters.With the large-scale development of photovoltaic plant, the generating efficiency of inverter is more and more important, and inverter is carried out
Status monitoring just turns into required and worked.At present, to the status monitoring of photovoltaic DC-to-AC converter mainly by manually periodically to inverter
Inspection is carried out, monitoring project is also more based on the various safeguard measures of inverter itself outfit, such as detection of electrical leakage, arc-detection
Deng.
However, the existing this mode for relying on artificial periodically progress inverter monitoring, on the one hand, be primarily directed to inverse
Become the fault detect of device, the power output situation of inverter can not be detected；On the other hand, the artificial mode of this dependence can not yet
Obtain the unusual condition of inverter in time, it is ensured that the operational efficiency of inverter, and cost of labor is high, it is impossible to effectively avoid failure and
The generation of accident.Therefore, how to inverter, this nucleus equipment is timely and effectively detected, and is predicted its state and is sent announcement
Alert information, to carry out the maintenance of photovoltaic DC-to-AC converter and management, improves the reliability of photovoltaic plant, turns into photovoltaic DC-to-AC converter state prison
The problem of one urgent need to resolve of control.
The content of the invention
It is existing to solve it is an object of the invention to provide the method for detecting abnormality and device of inverter in a kind of photovoltaic plant
There is technology timely and effectively can not carry out Efficiency testing to the inverter in photovoltaic plant, predict its state and carry out asking for early warning
Topic.
According to an aspect of the present invention, there is provided the method for detecting abnormality of inverter in a kind of photovoltaic plant, including：Obtain
The measurement power output of condition irradiation level and inverter corresponding to inverter in photovoltaic plant under condition irradiation level；Judge inverse
Whether the difference of the measurement power output and theoretical power output of the inverter under condition irradiation level that become device is more than given threshold；
If being more than given threshold, abnormal warning information occurs for generation instruction inverter.
According to another aspect of the present invention, a kind of abnormal detector of inverter in photovoltaic plant is additionally provided, including：
Acquisition module, for obtaining the survey of condition irradiation level and inverter under condition irradiation level corresponding to the inverter in photovoltaic plant
Measure power output；Judge module, for judging the measurement power output and theory of the inverter under condition irradiation level of inverter
Whether the difference of power output is more than given threshold；Execution module, if the judged result for judge module is more than setting threshold
The warning information of value, then generation instruction inverter generation exception.
The abnormality detection scheme of inverter, is existed by comparing inverter in the photovoltaic plant provided according to embodiments of the present invention
Measurement power output and theoretical power output under condition irradiation level, it may be determined that the power output situation of inverter.If inversion
The measurement power output of device and the difference of theoretical power output are more than certain threshold value, then show that the inverter may be because some originals
Thus cause exception, can not effectively export, generate corresponding warning information in the case, in order to run and attendant's root
The exception of inverter is handled in time according to the warning information, it is achieved thereby that timely and effectively to the inversion in photovoltaic plant
Device carries out Efficiency testing, predicts its state and carries out early warning, operation and the maintenance efficiency of photovoltaic plant greatly improved.
Brief description of the drawings
Fig. 1 shows the step of method for detecting abnormality of inverter in a kind of according to embodiments of the present invention one photovoltaic plant
Flow chart；
Fig. 2 shows the step of method for detecting abnormality of inverter in a kind of according to embodiments of the present invention two photovoltaic plant
Flow chart；
Fig. 3 shows the step of method for detecting abnormality of inverter in a kind of according to embodiments of the present invention three photovoltaic plant
Flow chart；
Fig. 4 shows the structure of the abnormal detector of inverter in a kind of according to embodiments of the present invention four photovoltaic plant
Block diagram；
Fig. 5 shows the structure of the abnormal detector of inverter in a kind of according to embodiments of the present invention five photovoltaic plant
Block diagram.
Embodiment
The exemplary embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
Embodiment one
Reference picture 1, show the method for detecting abnormality of inverter in a kind of according to embodiments of the present invention one photovoltaic plant
Step flow chart.
The method for detecting abnormality of inverter comprises the following steps in the photovoltaic plant of the present embodiment：
Step S102：Condition irradiation level and inverter corresponding to the inverter in photovoltaic plant are obtained under condition irradiation level
Measurement power output.
Wherein, condition irradiation level corresponding to inverter is referred to be in other photovoltaics of same geographic area with inverter
The irradiation level of equipment in power station obtains, and includes but is not limited to, and is obtained by the irradiation level of light-metering tower.
Measurement power output of the inverter under condition irradiation level represents reality output of the inverter under certain irradiation level
Power, it can be obtained by measuring.
Step S104：Judge the measurement power output and theoretical power output of the inverter under condition irradiation level of inverter
Difference whether be more than given threshold.
The theoretical power output of inverter represents ideal output power of the inverter under certain irradiation level, generally comes
Say, the measurement power output (real output) for the inverter that actual measurement obtains is less than theoretical power output.
Wherein, given threshold can be appropriately arranged with by those skilled in the art according to actual conditions, with being capable of effective detection
Whether the power output of inverter is principle extremely, and the embodiment of the present invention is not limited the specific setting numerical value of given threshold
System.When judging whether the difference is more than given threshold, a kind of feasible pattern includes：Directly judge whether the difference of acquisition is big
In corresponding given threshold；Another feasible pattern includes：Judge whether the ratio of the difference and theoretical power output is more than
Corresponding given threshold；Still further possibility includes：Judge the difference and theoretical power output ratio percentage whether
More than corresponding given threshold.But not limited to this, in actual applications, those skilled in the art can also use other appropriate
Judgment mode, such as the difference is carried out after parameter or coefficient processing again compared with appropriate given threshold, it also falls into
The protection domain of the embodiment of the present invention.In addition, it will be appreciated by those skilled in the art that when the difference uses multi-form,
Given threshold is also using the form corresponding to the difference.For example, when the ratio hundred using the difference and theoretical power output
Divide ratio, then given threshold also uses the form of percentage.
Step S106：If the measurement power output of inverter and theoretical power output of the inverter under condition irradiation level
Difference is more than given threshold, then abnormal warning information occurs for generation instruction inverter.
And if the difference of the measurement power output of inverter and theoretical power output of the inverter under condition irradiation level
No more than given threshold, then can not process, or, return to step S102 is continued executing with, or, advised according to the processing of setting
Then handle etc..
The method for detecting abnormality of inverter in the photovoltaic plant provided by the present embodiment, compare inverter and irradiated in condition
Measurement power output and theoretical power output under degree, determine the power output situation of inverter.If the measurement output of inverter
The difference of power and theoretical power output is more than certain threshold value, then shows that the inverter may be because some reasons and cause different
Often, it can not effectively export, generate corresponding warning information in the case, be believed in order to run with attendant according to the early warning
Breath is handled the exception of inverter in time, it is achieved thereby that timely and effectively entering line efficiency to the inverter in photovoltaic plant
Detection, predicts its state and carries out early warning, operation and the maintenance efficiency of photovoltaic plant greatly improved.
Embodiment two
Reference picture 2, show the method for detecting abnormality of inverter in a kind of according to embodiments of the present invention two photovoltaic plant
Step flow chart.
The method for detecting abnormality of inverter can be held by the control system in photovoltaic plant in the photovoltaic plant of the present embodiment
OK, the control system can provide the flexible platform for following functions, and the function includes：To the power station of multiple photovoltaic plants
Device carry out realtime power control, for photovoltaic plant operate and for non-time critical control ability supervision control function with
And for monitoring photovoltaic plant performance and the data acquisition functions for supporting running and safeguarding.But not limited to this, this area skill
Art personnel should be appreciated that in actual applications, inversion in the photovoltaic plant of any other appropriate achievable embodiment of the present invention
The equipment of the method for detecting abnormality of device can refer to the present embodiment execution.
The method for detecting abnormality of inverter comprises the following steps in the photovoltaic plant of the present embodiment：
Step S202：Condition irradiation level and inverter are in condition corresponding to inverter in control system acquisition photovoltaic plant
Measurement power output under irradiation level.
Wherein, the measurement power output of inverter represents real output of the inverter under certain irradiation level, different
Under irradiation level, the measurement power output of inverter may be different.In the present embodiment, condition irradiation level corresponding to inverter is with reference to same
The irradiation level of light-metering tower in one geographic area.That is, in the present embodiment, control system obtains the irradiation level of light-metering tower measurement,
Using the irradiation level as condition irradiation level corresponding to inverter.But not limited to this, in actual applications, it can also use and inversion
Irradiation level of the irradiation level of the equipment in other photovoltaic plants in the same geographic area of device as inverter, such as photovoltaic module
Irradiation level etc..
In an optional embodiment, condition irradiation level corresponding to inverter of the control system in photovoltaic plant is obtained and
Before measurement power output of the inverter under the condition irradiation level, it can also judge the inverter in photovoltaic plant whether in limit
Electricity condition；If it is not, condition irradiation level and inverter corresponding to the inverter in photovoltaic plant are then obtained under the condition irradiation level
Measurement power output.Under the state of rationing the power supply, inverter is in abnormal operating state or closed mode, number in such cases
According to the state that can not accurately indicate inverter, therefore, the data for the inverter being under non-state of rationing the power supply only are obtained, it is inverse to improve
Become the accuracy and efficiency of device abnormality detection and early warning, and reduce data processing amount.
The measurement power output of condition irradiation level corresponding to inverter and inverter under the condition irradiation level can be entered
Row is periodically gathered or obtained, and kind such as per second obtains once, and in a kind of feasible embodiment, control system can be periodically
Gather the measurement power output of condition irradiation level and inverter under the condition irradiation level corresponding to the inverter in photovoltaic plant；
Then, the condition irradiation level and measurement power output of inverter setting time section periodically collected are averaged respectively
Computing, determine the average value of condition irradiation level and the average value of measurement power output；Wherein, setting time section includes multiple collections
Cycle.For example, control system obtains the condition irradiation level and measurement power output of an inverter each second, then at one minute
Interior, control system will obtain the condition irradiation level and measurement power output of 60 inverters.Wherein, one minute this setting time
Section includes 60 collection period.Then, the data of 60 condition irradiation level and 60 measurement power outputs are put down respectively
Equal computing, the average value of condition irradiation level and the average value of measurement power output are obtained, by the average value of condition irradiation level and survey
Measure condition irradiation level and measurement power output of the average value as final inverter of power output.Wherein, collection period and
Setting time section can be appropriately arranged with by those skilled in the art according to actual conditions, and the embodiment of the present invention is not limited this
System.By being averaged to multiple data samples of collection, it can more precisely reflect the state of inverter, avoid accidental feelings
To the erroneous judgement of inverter state caused by condition.It will be appreciated that those skilled in the art that single data acquisition or collection represent
The data of time point or the period of representative are equally applicable.
Step S204：Control system condition irradiation level according to corresponding to inverter, determine inverter under condition irradiation level
Theoretical power output.
The theoretical power output of inverter is proportional with irradiation level, and irradiation level is higher, the theoretical output work of inverter
Rate is higher., can be by irradiation level and inverter when determining the theoretical power output of inverter according to condition irradiation level
The historical data analysis of the relation of theoretical power output obtains, and can also be set according to the experience of the operation maintenance personnel of photovoltaic plant
It is fixed, it can also be determined according to emulation experiment.
In a kind of optional mode, control system can according to corresponding to inverter condition irradiation level and inverter it is specified
Power, determine theoretical power output of the inverter under condition irradiation level.For example, the rated power of inverter is 550KW (thousand
Watt), then live irradiation level 1500 (watt/square metre) when, the theoretical power output of inverter can be set as 550KW.It is logical
The rated power of inverter is crossed, can simply and easily determine the theoretical power output of inverter, realizes simple, cost of implementation
It is low.
It should be noted that if control system, which employs, obtains bar corresponding to setting time section periodically collection inverter
During measurement power output under condition irradiation level of part irradiation level and inverter, then accordingly, control system is according to inversion
Condition irradiation level corresponding to device, also can be by setting time section when determining theoretical power output of the inverter under condition irradiation level
Interior acquisition, the inverter corresponding theoretical power output under the condition irradiation level of periodicity collection carry out average calculating operation, it is determined that
The average value of theoretical power output is as the theoretical power output being subsequently compared.
Step S206：Control system judges measurement power output of the inverter under condition irradiation level with inverter at this
Whether the difference of the theoretical power output under part irradiation level is more than given threshold；If being more than, step S208 is performed；If less
In then performing step S210.
Wherein, given threshold can be appropriately arranged with by those skilled in the art according to actual conditions, the embodiment of the present invention pair
This is not restricted.
In the case where foregoing measurement power output and theoretical power output employ average value, in this step, control
System can obtain the average value of measurement power output and putting down for theoretical power output corresponding to multiple continuous setting time sections
Average；It is determined that measurement power output in each setting time section average value and theoretical power output average value difference；
Judge whether each difference is all higher than given threshold.If for example, setting time Duan Weiyi minutes, collection period is one second kind, then
It is that the 60 corresponding power data collected are put down that power output and theoretical power output are measured corresponding to this minute
Average value after.If being detected to the data of continuous three minutes, this three minutes power data both corresponds to different
Power data after average.By continuously detecting, more precisely the power condition of inverter can be judged, avoid idol
Judged by accident caused by hair event.
In addition, when judging whether the difference is more than given threshold, a kind of feasible pattern includes：Directly judge what is obtained
Whether difference is more than corresponding given threshold；Another feasible pattern includes：Judge the ratio of the difference and theoretical power output
Whether value is more than corresponding given threshold；Still further possibility includes：Judge the ratio of the difference and theoretical power output
Whether percentage is more than corresponding given threshold.But not limited to this, in actual applications, those skilled in the art can also use
Other appropriate judgment modes, such as the difference is carried out after parameter or coefficient processing again compared with appropriate given threshold
Deng it also falls into the protection domain of the embodiment of the present invention.In addition, it will be appreciated by those skilled in the art that when the difference uses
During multi-form, given threshold is also using the form corresponding to the difference.For example, when using the difference and theoretical output work
The ratio percentage of rate, then given threshold is also using the form of percentage.
Step S208：Abnormal warning information occurs for control system generation instruction inverter, terminates this flow.
If it is determined that inverter there occurs exception, then control system can generate the warning information of any appropriate ways, e.g., enter
Row audible alarm, display alarm, send warning message etc..
In a kind of feasible embodiment, according to the regular generation instruction inverter of setting occurs for control system abnormal show
Show information and/or prompt message.Wherein, setting rule can suitably be set by those skilled in the art according to actual conditions, e.g.,
Display lamp corresponding to the inverter that exception will occur is arranged to conspicuous color (such as red, salmon pink), sends audible alarm, be logical
Cross operation maintenance personnel of Word message prompting photovoltaic plant etc..
Step S210：Control system normally shows the measurement power output of inverter with inverter under condition irradiation level
The difference of theoretical power output, terminate this flow.
In the present embodiment, if the difference of measurement power output of the inverter under condition irradiation level and theoretical power output is not
More than given threshold, then control system normally shows the difference, such as shows the inverter no exceptions with green.
It should be noted that in actual applications, if measurement power output of the inverter under condition irradiation level and theory
The difference of power output is not more than given threshold, and control system can also carry out other appropriate places in addition to above-mentioned normal display
Reason, if do not processed, or return to step S202 is continued executing with, and the embodiment of the present invention is not restricted to this.
In addition it is also necessary to explanation, in a preferred embodiment, control system can also obtain inverter
While condition irradiation level and measurement power output, the fault message of inverter is obtained, wherein, the fault message is inverse for indicating
Become whether device breaks down；And fault alarm is carried out to the inverter to break down of fault message instruction.Such as, inverter indicates
Lamp is changed into red and carries out audible alarm etc..That is, a kind of feasible pattern includes：In step S202, control system obtains photovoltaic
While measurement power output under condition irradiation level of condition irradiation level and inverter corresponding to inverter in power station, also obtain
Take the fault message of inverter；If control system a certain inverter according to corresponding to judging fault message there occurs failure, enters
Row fault alarm.
In another preferred embodiment of the embodiment of the present invention, control system can show testing number according to setting rule
According to, wherein, detection data include：The measurement power output of inverter and the difference of theoretical power output.It is highly preferred that testing number
According to also including at least one of：Measure power output, theoretical power output, condition irradiation level.Wherein, setting rule can be by
Those skilled in the art suitably set according to the actual requirements, e.g., show different difference and data in different colors.That is, control
System processed can to the condition irradiation level of each inverter of detection, measurement power output, theoretical power output, measurement power output and
The difference of theoretical power output is shown, is such as shown according to the difference of data using different colours, effectively to prompt light
The operation of overhead utility and attendant.
, can based on the measurement power output after multisample data statistics averagely and theoretical power output by the present embodiment
More effectively to reflect the time of day of inverter exactly.Pass through measurement of the inverter after comparing averagely under condition irradiation level
Power output and theoretical power output, it can accurately and effectively determine the power output situation of inverter.If the measurement of inverter
The difference of power output and theoretical power output is more than certain threshold value, then shows that the inverter may be because some reasons and cause
It is abnormal, it can not effectively export, generate corresponding warning information in the case, in order to run with attendant according to the early warning
Information is handled the exception of inverter in time, it is achieved thereby that timely and effectively being imitated to the inverter in photovoltaic plant
Rate detects, and predicts its state and carries out early warning, operation and the maintenance efficiency of photovoltaic plant greatly improved.Also, by phase
The display of data is closed, the operation of photovoltaic plant and attendant can also be visually observed that the power output of inverter, enter one
Step improves operation and the maintenance efficiency of photovoltaic plant.
Embodiment three
Reference picture 3, show the method for detecting abnormality of inverter in a kind of according to embodiments of the present invention three photovoltaic plant
Step flow chart.
The present embodiment is in the form of an instantiation, to the exception of inverter in photovoltaic plant provided in an embodiment of the present invention
Detection method illustrates.
The method for detecting abnormality of inverter comprises the following steps in the photovoltaic plant of the present embodiment：
Step S302：Gather the detection data of inverter to be detected in photovoltaic plant.
Wherein, inverter to be detected includes one or more, in the present embodiment, is only illustrated exemplified by one, but
It will be appreciated by those skilled in the art that in the case of more inverters, each of which platform can enter with reference to the present embodiment
The corresponding abnormality detection of row.
The control system of photovoltaic plant gather inverter detection data when, can using ModBus RTU by the way of and
Inverter communicates, and is communicated using ModBus TCP modes with light-metering tower.ModBus agreements are application layer Message Protocols, can
Apply in different types of bus or network.At present, ModBus has three kinds of communication modes：(1) Ethernet, corresponding communication pattern
For ModBus TCP modes；(2) asynchronous serial transmission (for example wired RS-232/422/485/ of various media；Optical fiber, wireless etc.),
Corresponding communication pattern is ModBus RTU modes or ModBus ASCII modes；(3) high speed token passing network is corresponding logical
Letter pattern is ModBus PLUS modes.
In the present embodiment, the detection data of the inverter of collection include：Real output (the i.e. measurement output of inverter
Power), setting power, fault message (include but is not limited at least one of：DC over-voltage, direct current are under-voltage, direct current excessively stream,
Exchange overvoltage, AC undervoltage, AC overcurrent, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar
Transistor npn npn) fault message such as failure, frequency fault)；And the irradiation level of collection light-metering tower.Wherein, power is set to be used to sentence
Whether disconnected inverter is in state of rationing the power supply.In general, more than or equal to rated power it is believed that be in unlimited electricity condition, otherwise locate
In the state of rationing the power supply.
Step S304：Determine the theoretical power output of inverter.
In this step, it is thus necessary to determine that each inverter corresponding theoretical power output, irradiation level under different irradiation level are got over
The theoretical power output of high inverter is higher.Wherein, irradiation level scope is generally 0-1500 (watt/square metre), irradiation level pair
The theoretical power output answered is different and different with the rated power of live inverter, such as, the rated power of live inverter is
550KW (kilowatt), then live irradiation level 1500 (watt/square metre) when, the theoretical power output of inverter can be identified as
550KW。
Step S306：Obtain real output, theoretical power output, setting power, the light-metering tower irradiation level of inverter
Ten minute datas and be stored in database.
The real output of the inverter of collection in worksite, theoretical power output, setting power, light-metering tower irradiation level are adopted
It is 1 second to collect cycle set, by taking real output as an example, the 600 actual power data of collection in ten minutes, this 600 data
Cumulative and then divided by 600 ten minutes average datas for being achieved with real output.Certainly, because communicative reasons may not
Reach collection 600, then the data accumulation of collection divided by the bar number of collection are ten minutes average datas.By that analogy, count
Calculate ten minutes average datas of theoretical power output, setting power and irradiation level.Then ten minute datas of acquisition are stored in
Database.
Step S308：The data record of the inverter of setting time section is inquired about from database, detects the state of inverter,
It is determined that abnormal inverter occurs.
During this step is realized, first, the interactive interface that control system is provided by system selects to be detected
Inverter and the period of inquiry, and, the threshold value of the theoretical power output and real output difference that set inverter (needs
It is noted that the data acquisition that the threshold value in addition to it can be inputted by interactive interface, can also be provided by third-party application
Interface obtains, the historical data statistic analysis result or the simulation experiment result that such as third-party application provides)；Then, control system
System judges whether the setting power of first inverter of selection is more than 500KW, enters if greater than 500 in next step, if small
In 500KW, then the inverter is in state of rationing the power supply (real output for condition adjudgement inverter of rationing the power supply and theoretical output work
The difference of rate is insignificant), then search next inverter；Then, control system judges that continuous three ten minute datas are real
Whether the difference of border power output and theoretical power output is more than given threshold, and in the present embodiment, threshold value is in the form of percentage
Setting, then control system judges the phase of continuous three ten minute data real outputs and theoretical power output in the present embodiment
Whether poor percentage is more than given threshold；If greater than given threshold, then shown in interface.By that analogy, under lookup
Whether one inverter, three ten minute data real outputs and theoretical power output difference percentage are more than given threshold,
Finished until the inverter of selection is searched, corresponding data record is shown in interface.
Step S310：Show the testing result of inverter.
In display interface, inverter sorts according to watt level, for example, inverter according to watt level color by deeply to
It is plain to show.If power is identical, color is also identical.Multiple color can be set in inverter, such as 20 kinds of colors.Obviously, power phase
The same more multidisplay number of colors of inverter is fewer.Thus, according to the depth of the inverter color of display, you can know inversion
The efficiency of device.It is more than setting threshold for three ten minute data real outputs and theoretical power output difference percentage
The data of the part inverter of value can be shown or be highlighted with conspicuous color, to remind operation and attendant.
In addition, fault message of the control system always according to the inverter of collection, judges the whether faulty alarm of inverter, such as
Have, then inverter is shown in red.
, can be to the light containing more inverters by the method for detecting abnormality of inverter in the photovoltaic plant of the present embodiment
Overhead utility carries out inverter state detecting.Pass through information (such as failure of photovoltaic plant inverter to inverter in photovoltaic plant
Information, the power of inverter, the information such as irradiation level of light-metering tower) collection and processing, and then obtain the theoretical output of inverter
Power, and real output and the difference of theoretical power output.The state of inverter can be effectively determined according to the difference.
In addition, assigning inverter color automatically in display interface according to the power contrast between inverter, make operation and attendant
The very clear efficiency for knowing inverter, the real output of inverter history and theoretical power output can also be found
Difference.According to the efficiency analysis of inverter, operation and attendant can be in terms of the operations and maintenance of reasonable arrangement photovoltaic plant
Draw, reduce because inverter efficiency is low and caused by economic loss, accurate early warning and the larger inversion of theoretical power output deviation
Device, the percentage that inverter efficiency is less than normal value is provided, realize effective early warning to abnormal inverter may occur.
Example IV
Reference picture 4, show the abnormal detector of inverter in a kind of according to embodiments of the present invention four photovoltaic plant
Structured flowchart.
The abnormal detector of inverter includes in the photovoltaic plant of the present embodiment：Acquisition module 402, for obtaining photovoltaic
The measurement power output of condition irradiation level and inverter corresponding to inverter in power station under condition irradiation level；Judge module
404, for judging that the difference of theoretical power output of the measurement power output of inverter with inverter under condition irradiation level is
It is no to be more than given threshold；Execution module 406, if the judged result for judge module 404 is to refer to more than given threshold, generation
Show that abnormal warning information occurs for inverter.
The abnormal detector of inverter in the photovoltaic plant that the present embodiment provides, irradiated by comparing inverter in condition
Measurement power output and theoretical power output under degree, it may be determined that the power output situation of inverter.If the measurement of inverter
The difference of power output and theoretical power output is more than certain threshold value, then shows that the inverter may be because some reasons and cause
It is abnormal, it can not effectively export, generate corresponding warning information in the case, in order to run with attendant according to the early warning
Information is handled the exception of inverter in time, it is achieved thereby that timely and effectively being imitated to the inverter in photovoltaic plant
The rate morning surveys, and predicts its state and carries out early warning, operation and the maintenance efficiency of photovoltaic plant greatly improved.
Embodiment five
Reference picture 5, show the abnormal detector of inverter in a kind of according to embodiments of the present invention five photovoltaic plant
Structured flowchart.
The abnormal detector of inverter includes in the photovoltaic plant of the present embodiment：Acquisition module 502, for obtaining photovoltaic
Condition irradiation level corresponding to inverter in power station, and measurement power output of the inverter under condition irradiation level；Judge module
504, for judging that the difference of theoretical power output of the measurement power output of inverter with inverter under condition irradiation level is
It is no to be more than given threshold；Execution module 506, if the judged result for judge module 504 is to refer to more than given threshold, generation
Show that abnormal warning information occurs for inverter.
Alternatively, acquisition module 502 is in condition irradiation level corresponding to the inverter in obtaining photovoltaic plant：Obtain light-metering
The irradiation level of tower measurement, using the irradiation level of acquisition as condition irradiation level corresponding to inverter.
Alternatively, the abnormal detector of inverter also includes in the photovoltaic plant of the present embodiment：Determining module 508, use
In measurement power output and theoretical power output of the inverter under condition irradiation level that inverter is judged in judge module 504
Whether difference is more than before given threshold, the condition irradiation level according to corresponding to inverter, determines inverter under condition irradiation level
Theoretical power output.
Optionally it is determined that module 508, for the rated power of condition irradiation level and inverter according to corresponding to inverter,
Determine theoretical power output of the inverter under condition irradiation level.
Alternatively, acquisition module 502, for periodically gather condition irradiation level corresponding to the inverter in photovoltaic plant and
Measurement power output of the inverter under condition irradiation level；The condition spoke for the inverter that setting time section periodically is collected
Illumination and measurement power output carry out average calculating operation respectively, determine the average value of condition irradiation level and being averaged for measurement power output
Value；Wherein, setting time section includes multiple collection period；Determining module 508, for by obtained in setting time section, inversion
Device corresponding theoretical power output under the condition irradiation level of periodicity collection carries out average calculating operation, it is determined that theoretical power output
Average value.
Alternatively, judge module 504, the flat of power output is measured corresponding to multiple continuous setting time sections for obtaining
The average value of average and theoretical power output；It is determined that each the average value of the measurement power output in setting time section and theory are defeated
Go out the difference of the average value of power；Judge whether each difference is all higher than given threshold.
Alternatively, the abnormal detector of inverter also includes in the photovoltaic plant of the present embodiment：Ration the power supply determining module
510, for condition irradiation level corresponding to the inverter in obtaining photovoltaic plant in acquisition module 502, and inverter is in condition spoke
Before measurement power output under illumination, judge the inverter in photovoltaic plant whether in state of rationing the power supply；Obtained if it is not, then performing
Modulus block 502.
Alternatively, the abnormal detector of inverter also includes in the photovoltaic plant of the present embodiment：Display module 512, use
Data are detected in being shown according to setting rule, wherein, detection data include：The measurement power output of inverter and theoretical output work
Rate difference.
Alternatively, detection data also include at least one of：Measure power output, theoretical power output, condition irradiation
Degree.
Alternatively, execution module 506, if the judged result for judge module 504 is more than given threshold, according to setting
Then abnormal display information and/or prompt message occur set pattern for generation instruction inverter.
Alternatively, acquisition module 502 is additionally operable to obtain the fault message of inverter, wherein, fault message is inverse for indicating
Become whether device breaks down；Also, the abnormal detector of inverter also includes in the photovoltaic plant of the present embodiment：Fault alarm
Module 514, the inverter to break down for indicating fault message carry out fault alarm.
Alternatively, the measurement power output that judge module 504 is used to obtain inverter is with inverter under condition irradiation level
Theoretical power output difference, judge the difference and theoretical power output ratio or ratio percentage whether be more than it is corresponding
Given threshold.
The abnormal detector of inverter is used to realize in aforesaid plurality of embodiment of the method in the photovoltaic plant of the present embodiment
Photovoltaic plant in inverter method for detecting abnormality, and the beneficial effect with corresponding embodiment of the method is no longer superfluous herein
State.
It may be noted that according to the needs of implementation, all parts/step described in this application can be split as more multi-section
Part/step, the part operation of two or more components/steps or components/steps can be also combined into new components/steps,
To realize the purpose of the present invention.
Above-mentioned the method according to the invention can be realized in hardware, firmware, or be implemented as being storable in recording medium
Software or computer code in (such as CD ROM, RAM, floppy disk, hard disk or magneto-optic disk), or it is implemented through network download
Original storage in long-range recording medium or nonvolatile machine readable media and the meter that will be stored in local recording medium
Calculation machine code, so as to which method described here can be stored in using all-purpose computer, application specific processor or programmable or special
With such software processing in hardware (such as ASIC or FPGA) recording medium.It is appreciated that computer, processor, micro-
Processor controller or programmable hardware include can storing or receive software or computer code storage assembly (for example, RAM,
ROM, flash memory etc.), when the software or computer code are by computer, processor or hardware access and when performing, realize herein
The processing method of description.In addition, when all-purpose computer accesses the code for realizing the processing being shown in which, the execution of code
All-purpose computer is converted into the special-purpose computer for performing the processing being shown in which.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (20)
1. the method for detecting abnormality of inverter in a kind of photovoltaic plant, including：
Obtain the survey of condition irradiation level and the inverter under the condition irradiation level corresponding to the inverter in photovoltaic plant
Measure power output；
Judge theoretical output of the measurement power output of the inverter with the inverter under the condition irradiation level
Whether the difference of power is more than given threshold；
If being more than the given threshold, generation indicates that abnormal warning information occurs for the inverter.
2. the method according to claim 11, wherein, condition irradiation level corresponding to the inverter obtained in photovoltaic plant
The step of include：
The irradiation level of light-metering tower measurement is obtained, using the irradiation level as condition irradiation level corresponding to the inverter.
3. according to the method for claim 2, wherein, judge the measurement power output of the inverter with it is described inverse
Before the step of whether difference of theoretical power output of the change device under the condition irradiation level is more than given threshold, methods described
Also include：
According to the rated power of condition irradiation level and the inverter corresponding to the inverter, determine the inverter described
Theoretical power output under condition irradiation level.
4. the method according to claim 11, wherein,
Condition irradiation level corresponding to inverter in the acquisition photovoltaic plant and the inverter are under the condition irradiation level
Measurement power output the step of include：
Condition irradiation level and the inverter corresponding to the inverter in the photovoltaic plant are periodically gathered in the condition spoke
Measurement power output under illumination；The condition irradiation level for the inverter that setting time section periodically is collected and described
Measurement power output carries out average calculating operation respectively, determines the average value of condition irradiation level and the average value of measurement power output；Its
In, the setting time section includes multiple collection period；
The condition irradiation level according to corresponding to the inverter, determine theory of the inverter under the condition irradiation level
The step of power output, includes：
Inverter obtained in the setting time section, described is corresponded under the condition irradiation level that the periodicity gathers
Theoretical power output carry out average calculating operation, it is determined that the average value of theoretical power output.
5. according to the method for claim 4, wherein, judge the measurement power output of the inverter and the inversion
The step of whether difference of theoretical power output of the device under the condition irradiation level is more than given threshold includes：
Obtain the average value of measurement power output and putting down for theoretical power output corresponding to multiple continuous setting time sections
Average；
It is determined that measurement power output in each setting time section average value and theoretical power output average value difference；
Judge whether each difference is all higher than the given threshold.
6. according to the method for claim 1, wherein, condition corresponding to the inverter in the acquisition photovoltaic plant irradiates
Before the step of measurement power output under the condition irradiation level of degree and the inverter, methods described also includes：
Judge the inverter in the photovoltaic plant whether in state of rationing the power supply；
If it is not, condition irradiation level and the inverter corresponding to the inverter in the acquisition photovoltaic plant are then performed in the bar
The step of measurement power output under part irradiation level.
7. according to the method for claim 1, wherein, methods described also includes：
According to setting rule display detection data, wherein, the detection data include：The difference, and, below at least it
One：The measurement power output, the theoretical power output, the condition irradiation level.
8. according to the method for claim 1, wherein, the generation indicates that abnormal warning information occurs for the inverter
Step includes：
Indicate that abnormal display information and/or prompt message occur for the inverter according to setting rule generation.
9. according to the method for claim 1, wherein, methods described also includes：
The fault message of the inverter is obtained, wherein, the fault message is used to indicate whether the inverter breaks down；
Fault alarm is carried out to the inverter to break down of fault message instruction.
10. according to the method for claim 1, wherein, judge the measurement power output of the inverter with it is described inverse
The step of whether difference of theoretical power output of the change device under the condition irradiation level is more than given threshold includes：
Obtain theoretical output of the measurement power output of the inverter with the inverter under the condition irradiation level
Whether the difference of power, the ratio or ratio percentage for judging the difference and the theoretical power output are more than corresponding setting
Threshold value.
11. the abnormal detector of inverter in a kind of photovoltaic plant, including：
Acquisition module, for obtaining condition irradiation level corresponding to the inverter in photovoltaic plant and the inverter in the condition
Measurement power output under irradiation level；
Judge module, for judging the measurement power output of the inverter with the inverter in the condition irradiation level
Under the difference of theoretical power output whether be more than given threshold；
Execution module, if the judged result for the judge module is described inverse more than the given threshold, generation instruction
Become device and abnormal warning information occurs.
12. device according to claim 11, wherein, inverter of the acquisition module in photovoltaic plant is obtained is corresponding
Condition irradiation level when：
The irradiation level of light-metering tower measurement is obtained, using the irradiation level as condition irradiation level corresponding to the inverter.
13. device according to claim 12, wherein, described device also includes：
Determining module, for judging that the measurement power output of the inverter exists with the inverter in the judge module
Whether the difference of the theoretical power output under the condition irradiation level is more than before given threshold, according to corresponding to the inverter
The rated power of condition irradiation level and the inverter, determine theoretical output work of the inverter under the condition irradiation level
Rate.
14. device according to claim 13, wherein,
The acquisition module, for periodically gathering condition irradiation level corresponding to the inverter in the photovoltaic plant and described inverse
Become measurement power output of the device under the condition irradiation level；Described in the inverter that setting time section periodically is collected
Condition irradiation level and the measurement power output carry out average calculating operation respectively, and the average value and measurement for determining condition irradiation level export
The average value of power；Wherein, the setting time section includes multiple collection period；
The determining module, for the institute for gathering inverter obtained in the setting time section, described in the periodicity
State corresponding theoretical power output under condition irradiation level and carry out average calculating operation, it is determined that the average value of theoretical power output.
15. device according to claim 14, wherein, the judge module, for obtaining multiple continuous settings
The average value of measurement power output corresponding to period and the average value of theoretical power output；It is determined that in each setting time section
Measure the difference of the average value of power output and the average value of theoretical power output；Judge whether each difference is all higher than institute
State given threshold.
16. device according to claim 11, wherein, described device also includes：
Ration the power supply determining module, for condition irradiation level corresponding to the inverter in obtaining photovoltaic plant in the acquisition module, and
Before measurement power output of the inverter under the condition irradiation level, judge whether is inverter in the photovoltaic plant
In the state of rationing the power supply；If it is not, then perform the acquisition module.
17. device according to claim 11, wherein, described device also includes：
Display module, for detecting data according to setting rule display, wherein, the detection data include：The difference, with
And at least one of：The measurement power output, the theoretical power output, the condition irradiation level.
18. device according to claim 11, wherein, the execution module, if the judgement knot for the judge module
Fruit be more than the given threshold, then according to setting rule generation indicate the inverter occur abnormal display information and/or
Prompt message.
19. device according to claim 11, wherein,
The acquisition module, it is additionally operable to obtain the fault message of the inverter, wherein, the fault message is described for indicating
Whether inverter breaks down；
Described device also includes：Fault alarm module, the inverter to break down for indicating the fault message are carried out
Fault alarm.
20. device according to claim 11, wherein, the judge module, for obtaining the survey of the inverter
The difference of power output and theoretical power output of the inverter under the condition irradiation level is measured, judges the difference and institute
Whether the ratio or ratio percentage for stating theoretical power output are more than corresponding given threshold.
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