CN102158129A - Solar photovoltaic system and fault detection method thereof - Google Patents

Solar photovoltaic system and fault detection method thereof Download PDF

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Publication number
CN102158129A
CN102158129A CN2011100328968A CN201110032896A CN102158129A CN 102158129 A CN102158129 A CN 102158129A CN 2011100328968 A CN2011100328968 A CN 2011100328968A CN 201110032896 A CN201110032896 A CN 201110032896A CN 102158129 A CN102158129 A CN 102158129A
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China
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described
fault
photovoltaic module
module
direct current
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CN2011100328968A
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Chinese (zh)
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CN102158129B (en
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罗宇浩
凌志敏
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浙江昱能光伏科技集成有限公司
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Abstract

The invention provides a solar photovoltaic system, which comprises a plurality of alternating current photovoltaic components, a data processing module and a system analysis module, wherein the plurality of alternating current photovoltaic components are mutually connected in series for constituting an alternating current photovoltaic component string to generate alternating current according to solar energy; the data processing module is connected with the alternating current photovoltaic component string and used for acquiring power parameters of all the alternating current photovoltaic components through power line communication technology and detecting and identifying abnormality or a fault in the solar photovoltaic system; and the system analysis module is connected with the data processing module and used for collecting system data from the data processing module and storing, analizing, drawing or displaying the system data. The invention further provides a fault detection method of the solar photovoltaic system. Through the way of monitoring real-time data transmission between all the alternating current photovoltaic components and the data processing module, when the fault occurs in the photovoltaic system, the generation of the fault can be timely detected, and the position and the type of the fault can be further identified, thereby enabling maintenance staff to repair the fault as soon as possible and reducing the impacts on normal power generation.

Description

Solar energy photovoltaic system and fault-finding method thereof

Technical field

The present invention relates to the photovoltaic sciemtifec and technical sphere, specifically, the present invention relates to a kind of solar energy photovoltaic system and fault-finding method thereof.

Background technology

Existing solar energy photovoltaic system generally comprises at least: the direct current photovoltaic module is used to produce direct current; The assembly inverter is used for converting direct current to alternating current; Component interface is used for receiving direct current from the direct current photovoltaic module; Lead; Exchange interface, be used for receiving alternating current or being connected to AC network from other module; Communication line is used to transmit data and control signal etc.

In present solar energy photovoltaic system, during when the needs maintenance or near system (for example routine maintenance, fire fighting), even if the electric brake that is incorporated into the power networks is disconnected, if photovoltaic module is still worked, then it can produce high-tension electricity, and personal safety is threatened.

When the people steals the parts of solar energy photovoltaic system at night, because photovoltaic module do not produce curtage, so common detection electric current, voltage method can not in time detect the system failure, and then take safeguard procedures.Similarly, if occur thrashing at night, for example disconnection that connects of cable etc. also can't be detected in time.

In addition, photovoltaic module sometimes also can operation irregularity, earth or other pollutants are for example arranged on the photovoltaic module, and the battery sheet damages or the like situation in the assembly, can monitor in time and correct that these are unusual and fault is all very necessary for performance, reliability and the fail safe of photovoltaic system.

Summary of the invention

A technical problem to be solved by this invention provides a kind of solar energy photovoltaic system and fault-finding method thereof, when solar energy photovoltaic system breaks down, can detect the generation of fault in time, and then identification location of fault and kind.

The technical problem that the present invention will solve in addition provides a kind of solar energy photovoltaic system and fault-finding method thereof, when solar energy photovoltaic system breaks down, can take to correct accordingly behavior automatically to this.

The technical problem that the present invention also will solve provides a kind of solar energy photovoltaic system and fault-finding method thereof, when the needs maintenance system, input of control commands requires each to exchange photovoltaic module and stops to produce alternating current on one's own initiative, guarantees attendant's personal safety.

For solving the problems of the technologies described above, the invention provides a kind of solar energy photovoltaic system, comprising:

A plurality of interchange photovoltaic modulies, interchange photovoltaic module string is formed in the connection that is one another in series, and is used for producing alternating current according to solar energy;

Data processing module is connected with the described photovoltaic module string that exchanges, and is used for obtaining described each by power line communication technology and exchanges the parameters of electric power of photovoltaic module, surveys and discern the unusual or fault that described solar energy photovoltaic system exists;

Systems Analysis Module is connected with described data processing module, is used for from described data processing module gathering system data and stores, analyzes, draws or show.

Alternatively, described solar energy photovoltaic system also comprises:

FCM fault control module is connected with described data processing module, is used for initiatively input of control commands, requires described each to exchange photovoltaic module and stops to produce alternating current.

Alternatively, described each interchange photovoltaic module comprises direct current photovoltaic module and assembly inverter, and the cable joint of described direct current photovoltaic module is connected with the input cable joint of described assembly inverter.

Alternatively, described assembly inverter has the inverter main body, and described inverter main body comprises:

Power conversion circuit, its input is connected with described direct current photovoltaic module, is used for direct current is converted into alternating current;

Observation circuit is in parallel with described power conversion circuit, is used to monitor the parameters of electric power of described power conversion circuit both sides;

Telecommunication circuit, output cable joint with described observation circuit and described assembly inverter is connected respectively, the parameters of electric power and the described data processing module that are used for obtaining according to described observation circuit communicate, and perhaps receive the control command of described FCM fault control module input;

Control circuit is connected with described power conversion circuit, observation circuit and telecommunication circuit respectively, closes described power conversion circuit when being used for the control command that receives according to described telecommunication circuit or described monitoring circuit monitors to the abnormal electrical force parameter.

Alternatively, described data processing module comprises:

Power line communication circuits is connected with the described photovoltaic module string that exchanges, and is used for communicating with described a plurality of photovoltaic modulies that exchange by power line communication technology;

Internal memory is connected with described power line communication circuits, is used to obtain and store the ac/dc working curve and the various direct current damage curve data of described a plurality of interchange photovoltaic modulies;

Data processing circuit, be connected with described internal memory, the ac/dc working curve that is used for storing according to described internal memory calculates the ac/dc averaged curve, each ac/dc working curve and described ac/dc averaged curve that exchanges photovoltaic module is compared to judge whether corresponding ac/dc photovoltaic module exists fault, and each DC operation curve and various direct current damage curve that exchanges photovoltaic module compared, judge which kind of fault described each interchange photovoltaic module exists;

Network communications circuits, be connected with described data processing circuit, power line communication circuits, Systems Analysis Module and FCM fault control module respectively, be used for communicating according to the result and the described Systems Analysis Module of described data processing circuit, perhaps the control command with described FCM fault control module input is sent to each interchange photovoltaic module.

Alternatively, described internal memory comprises:

The working curve database is connected with data processing circuit with described power line communication circuits respectively, is used to obtain and store the ac/dc working curve data of described a plurality of interchange photovoltaic modulies;

The damage curve database is connected with described data processing circuit, is used for storing in advance the direct current damage curve data under the various failure situations.

Alternatively, described parameters of electric power comprises the electric current or the voltage of direct current/alternating current.

Alternatively, described solar energy photovoltaic system also comprises:

Warning system is connected with described Systems Analysis Module, is used for when described Systems Analysis Module detects described solar energy photovoltaic system and has fault the information of described fault is outwards given the alarm.

Correspondingly, the present invention also provides a kind of fault-finding method of solar energy photovoltaic system, comprises step:

A. survey and exchange photovoltaic module, judge whether described interchange photovoltaic module exists fault;

If there is fault in B. described interchange photovoltaic module, then survey the direct current photovoltaic module, judge whether described direct current photovoltaic module exists fault;

If there is fault in C. described direct current photovoltaic module, then the DC operation curve of the direct current photovoltaic module of fault and the damage curve in the damage curve database are compared;

D. according to the result of above-mentioned comparison, judge whether to have discerned described fault;

If E. discerned described fault, then produce the information of described fault;

F. the information with described fault shows;

If there is not fault in G. described direct current photovoltaic module, assert that then there is fault in the assembly inverter, and continue execution in step E~F.

Alternatively, survey described interchange photovoltaic module and judge whether to exist fault to comprise step:

Obtain the alternate current operation curve of described a plurality of interchange photovoltaic modulies respectively;

Calculate the interchange averaged curve of described alternate current operation curve;

The described alternate current operation curve that each exchanges photovoltaic module is compared with the described averaged curve that exchanges;

Judge whether described interchange photovoltaic module exists fault.

Alternatively, survey described direct current photovoltaic module and judge whether to exist fault to comprise step:

Obtain the DC operation curve of described a plurality of direct current photovoltaic modulies respectively;

Calculate the direct current averaged curve of described DC operation curve;

The DC operation curve of described each direct current photovoltaic module is compared with described direct current averaged curve;

Judge whether described direct current photovoltaic module exists fault.

Alternatively, the information of described fault comprises position and the kind that described fault takes place.

Alternatively, the information of described fault also comprises the correction behavior at the suggestion of described fault.

Compared with prior art, the present invention has the following advantages:

Each exchanges the mode of real-time Data Transmission between photovoltaic module and the data processing module by monitoring in the present invention, can be when photovoltaic system breaks down, detect the generation of fault in time, and then identification location of fault and kind, so that the maintenance personal is repair a breakdown as early as possible, reduce influence to normal power generation.

When needs are safeguarded near solar energy photovoltaic system of the present invention or are needed emergency shutdown system because of other reasons, the user can be in FCM fault control module input of control commands, require to stop the work of power conversion circuit in the assembly inverter.At this moment, even if the direct current photovoltaic module still produces direct current, but the assembly inverter does not have the output AC electricity, has eliminated potential electric shock and has threatened, and guarantees attendant's personal safety.

The present invention can also take to correct accordingly behavior at location of fault of being discerned and kind automatically when breaking down, shorten the time that is subjected to fault effects.

Description of drawings

The above and other features of the present invention, character and advantage will become more obvious by the description below in conjunction with drawings and Examples, wherein:

Fig. 1 is the structural representation of the solar energy photovoltaic system of one embodiment of the invention;

Fig. 2 is the internal structure schematic diagram of interchange photovoltaic module of the solar energy photovoltaic system of one embodiment of the invention;

Fig. 3 is the internal structure schematic diagram of inverter main body of interchange photovoltaic module of the solar energy photovoltaic system of one embodiment of the invention;

Fig. 4 is the internal structure schematic diagram of data processing module of the solar energy photovoltaic system of one embodiment of the invention;

Fig. 5 is the flow chart of fault-finding method of the solar energy photovoltaic system of one embodiment of the invention;

Fig. 6 exchanges photovoltaic module for the detection of one embodiment of the invention and judges whether to exist the flow chart of the method for fault;

Fig. 7 is for the detection direct current photovoltaic module of one embodiment of the invention and judge whether to exist the flow chart of the method for fault.

Embodiment

The invention will be further described below in conjunction with specific embodiments and the drawings, but should not limit protection scope of the present invention with this.

Fig. 1 is the structural representation of the solar energy photovoltaic system of one embodiment of the invention, and as shown in the figure, this solar energy photovoltaic system can comprise:

A plurality of interchange photovoltaic modulies 3011,3012,3013...301N, interchange photovoltaic module string 302 is formed in the connection that is one another in series, and is used for producing alternating current according to solar energy;

Data processing module 307, successively by outlet 305 and A.C. distribution box 304 with exchange photovoltaic module string 302 and be connected, be used for exchanging photovoltaic module 3011 with each by power line communication technology, 3012,3013...301N communicate, obtain each and exchange photovoltaic module 3011,3012,3013...301N parameters of electric power, survey and discern the unusual or fault that solar energy photovoltaic system exists with this, this data processing module 307 can be field programmable gate array FPGA (Field Programmable Gate Array) or complex programmable logic device (CPLD) (Complex Programmable Logic Device) etc., but be to be understood that, data processing module 307 is not limited to adopt these forms, and other is suitable, all be can be used in the present embodiment by technology type known in those skilled in the art;

Systems Analysis Module 310, be connected with network port device 309 by Ethernet cable or radio communication and other similar methods well known in the art, and then be connected with data processing module 307 by network port device 309, be used for from data processing module 307 gathering system data, and system data is stored, analyzes, drawn or process such as displaying.

Continue with reference to shown in Figure 1, in the present embodiment, this solar energy photovoltaic system can also comprise: FCM fault control module 311, it is connected with data processing module 307 by network port device 309, be used for when photovoltaic system need be safeguarded or need emergency cut-off because of other reasons, initiatively importing a control command for the user.As shown in Figure 1, this control command arrives with A.C. distribution box 304 through network port device 309, data processing module 307, outlet 305 successively and exchanges photovoltaic module string 302, require wherein each interchange photovoltaic module 3011,3012,3013...301N to stop to produce alternating current, guarantee that the attendant can not be subjected to the threat of getting an electric shock.Certainly, the attendant photovoltaic system is finished and to be safeguarded or fault when needing to open again after having got rid of, the user also can import another control command at FCM fault control module 311 places, require each interchange photovoltaic module 3011,3012,3013...301N to recover operate as normal, continue to produce alternating current.

Fig. 2 is the internal structure schematic diagram of interchange photovoltaic module of the solar energy photovoltaic system of one embodiment of the invention.As shown in the figure, this interchange photovoltaic module 301 can comprise direct current photovoltaic module 100 and assembly inverter 100 ', direct current photovoltaic module 100 can comprise panel 101, direct current cables 102 and the cable joint 103 that many batteries sheet is formed, and assembly inverter 100 ' can comprise inverter main body 104, input cable joint 105, input dc power cable 106, output AC cable 107 and ac cable joint 108.Wherein, the cable joint 103 of direct current photovoltaic module 100 is connected with the input cable joint 105 of assembly inverter 100 '.

Fig. 3 is the internal structure schematic diagram of inverter main body of interchange photovoltaic module of the solar energy photovoltaic system of one embodiment of the invention.As shown in the figure, this inverter main body 104 can comprise:

Power conversion circuit 201, its input is connected with direct current photovoltaic module 100, is used for direct current is converted into alternating current;

Observation circuit 203, be in parallel with power conversion circuit 201, be used to monitor the parameters of electric power of power conversion circuit 201 both sides, this parameters of electric power can comprise the galvanic current value and/or the magnitude of voltage of power conversion circuit 201 inputs as required, can also comprise the current value and/or the magnitude of voltage of the alternating current of power conversion circuit 201 outputs;

Telecommunication circuit 204, output cable joint 108 with observation circuit 203 and assembly inverter 100 ' is connected respectively, the parameters of electric power and the data processing module 307 that are used for obtaining according to observation circuit 203 communicate, and perhaps telecommunication circuit 204 can also receive the various control commands from FCM fault control module 311 inputs;

Control circuit 202; be connected with power conversion circuit 201, observation circuit 203 and telecommunication circuit 204 respectively; be used for closing power conversion circuit 201 according to the control command that telecommunication circuit 204 receives from FCM fault control module 311; when perhaps observation circuit 203 monitors the abnormal electrical force constant; close power conversion circuit 201 for protection exchanges the consideration of photovoltaic module, it is quit work and output no longer includes alternating current output.

And Fig. 4 is the internal structure schematic diagram of data processing module of the solar energy photovoltaic system of one embodiment of the invention.As shown in the figure, this data processing module 307 can comprise:

Power line communication circuits 401 and exchanges photovoltaic module string 302 and is connected, and is used for communicating with wherein a plurality of each telecommunication circuits 204 that exchange photovoltaic module 3011,3012,3013...301N by power line communication technology;

Internal memory 402, be connected with power line communication circuits 401, be used to obtain and store alternate current operation curve and/or the DC operation curve of a plurality of interchange photovoltaic modulies 3011,3012,3013...301N, and various direct current damage curve data, alternate current operation curve and/or DC operation curve can be AC power curve, alternating current curve, alternating voltage curve, direct current power curve, direct current curve or direct voltage curve;

Data processing circuit 403, be connected with internal memory 402, be used for exchanging averaged curve according to each alternate current operation curve calculation that exchanges photovoltaic module 3011,3012,3013...301N of internal memory 402 storages, the alternate current operation curve that then each is exchanged photovoltaic module 3011,3012,3013...301N compares with the averaged curve that exchanges of calculating gained, by difference (two concrete difference between the curve and difference size can artificially be set) more between the two, can judge whether corresponding interchange photovoltaic module exists fault; If through above-mentioned comparison, assert and exchange photovoltaic module 3011,3012,3013...301N in one or more have fault, then similarly, continuation is according to each interchange photovoltaic module 3011 of storage in the internal memory 402,3012,3013...301N DC operation curve calculation direct current averaged curve, then each is exchanged photovoltaic module 3011,3012,3013...301N the DC operation curve compare with the direct current averaged curve of calculating gained, also be the difference (two concrete difference between the curve and difference size can artificially be set) by more between the two, can judge also whether corresponding direct current photovoltaic module exists fault in the aforementioned interchange photovoltaic module that has a fault; The various direct current damage curves that then each exchanged storage in the DC operation curve of photovoltaic module 3011,3012,3013...301N and the internal memory 402 compare coupling, finally judge aforementionedly to have the interchange photovoltaic module of fault specifically is to have which kind of fault; In the present embodiment, data processing circuit 403 can adopt digital signal processor DSP (Digital Signal Processor), central processor CPU or look-up table LUT various forms such as (Lookup Table) to realize.But should be appreciated that data processing circuit 403 is not limited to adopt these forms, other is suitable, all be can be used in the present embodiment by technology type known in those skilled in the art;

Network communications circuits 404, be connected with data processing circuit 403, power line communication circuits 401, Systems Analysis Module 310 and FCM fault control module 311 respectively, be used for communicating according to the result and the Systems Analysis Module 310 of data processing circuit 403, perhaps the control command with failure analysis module 311 inputs is sent to the telecommunication circuit 204 that each exchanges photovoltaic module 3011,3012,3013...301N.

Wherein, internal memory 402 can adopt various forms such as random access memory ram (Random Access Memory), read only memory ROM (Read Only Memory) or flash memory Flash Memory to realize.But should be appreciated that internal memory 402 is not limited to adopt these forms, other is suitable, all be can be used in the present embodiment by technology type known in those skilled in the art.Continue in internal memory 402, can establish with reference to shown in Figure 4:

Working curve database 4021, be connected with data processing circuit 403 with power line communication circuits 401 respectively, this working curve database 4021 is used to obtain and stores each and exchanges photovoltaic module 3011,3012,3013...301N alternate current operation curve data and DC operation curve data, this alternate current operation curve data is to exchange photovoltaic module 3011 by each with the DC operation curve data, 3012,3013...301N in the observation circuit 203 of corresponding assembly inverter 100 ' obtain from the output and the input of power conversion circuit 201, send to data processing module 307 respectively by its telecommunication circuit 204 then;

Damage curve database 4022 is connected with data processing circuit 403, and this damage curve database 4022 stores the direct current damage curve data under the various failure situations in advance, to judge which kind of fault exchanges photovoltaic module specifically exists.

In the present invention, solar energy photovoltaic system can also comprise a warning system (not shown), is connected with Systems Analysis Module 310, is used for when Systems Analysis Module 310 detects solar energy photovoltaic system and has fault the information of fault is outwards given the alarm.

The generation that solar energy photovoltaic system detection failure of the present invention once is described below (may be the operation troubles of system self, also may be photovoltaic system suffer that the burglar steals and the cable that causes disconnect), and then identification location of fault and kind, before maintenance system, carry out the instantiation procedure of safety function.

When solar energy photovoltaic system of the present invention breaks down in running; since data processing module 307 always with exchanges photovoltaic module string 302 in each the interchange photovoltaic module 3011; 3012; 3013...301N carrying out the communication of data; when if unusual or fault appear in certain interchange photovoltaic module; the parameters of electric power that data processing module 307 is obtained has unusually; even exchanged the communication disruption between the photovoltaic module with this; just can tentatively detect solar energy photovoltaic system thus and have unusual or fault, and can judge appearance unusual or location of fault and kind.Especially, if photovoltaic system suffers that the burglar steals, then exchange in the photovoltaic module string 302 each and exchange that the somewhere must have cable to disconnect among photovoltaic module 3011,3012, the 3013...301N.When 307 of data processing modules are received the data that a certain interchange photovoltaic module and above interchange photovoltaic module thereof transmit, and can not receive when other exchange the data that photovoltaic module transmits, be that data communication ends at this, then data processing module 307 is known under this place's interchange photovoltaic module has cable to disconnect, and its reason is likely has suffered burglar's stealing.

For example, referring to shown in Figure 1, data processing module 307 receives only and exchanges the various data that photovoltaic module 3012 and 3011 sends, exchange photovoltaic module 3013 and following respectively exchange the various data that photovoltaic module sends and fail to receive always, then can judge exchanging between the photovoltaic module 3012 and 3013 the cable disconnection has taken place.The present invention needs to monitor the transfer of data between each interchange photovoltaic module 3011,3012,3013...301N and data processing module 307 always, the needed electric energy of the realization of this function is from other places electrical network power taking, rather than from the power taking of this solar energy photovoltaic system, therefore this function exchanges photovoltaic module 3011,3012, still can not work when 3013...301N produces electric power at each, when for example the sunlight of evening or all interchange photovoltaic modulies is blocked.

When the needs staff safeguards near solar energy photovoltaic system of the present invention or handles some emergencies, if still can be sunlighted on the interchange photovoltaic module, the present invention has and closes the interchange photovoltaic module in advance so, makes it stop to produce the safety function of alternating current.Particularly, the user can be by input of control commands (shutdown command) in FCM fault control module 311, and this shutdown command is transferred to each by data processing module 307, A.C. distribution box 304 etc. and exchanges photovoltaic module 3011,3012,3013...301N.After telecommunication circuit 204 in the inverter main body 104 of each interchange photovoltaic module 3011,3012,3013...301N receives shutdown command this shutdown command is sent to correspondent control circuits 202, control circuit 202 is after receiving this shutdown command, close power conversion circuit 201, thereby make interchange photovoltaic module 3011,3012,3013...301N not have alternating electromotive force output, so just can maintenance repairer's personal safety not threatened.

Fig. 5 is the flow chart of fault-finding method of the solar energy photovoltaic system of one embodiment of the invention.As shown in the figure, this fault-finding method can start from step S501.

In step S502, survey and exchange photovoltaic module, judge whether exchange photovoltaic module exists fault.In the present embodiment, since data processing module be always with exchanges the photovoltaic module string in each exchange photovoltaic module and carrying out the communication of data, whether detection can have transfer of data continuously to carry out by monitoring between each interchange photovoltaic module and the data processing module.When can receiving all, data processing module exchanges the various parameters of electric power that photovoltaic module sends, the electric current and the voltage that comprise the galvanic or alternating current of power conversion circuit both sides wherein, it is all normal to think that then each exchanges photovoltaic module work, exchange photovoltaic module and do not have fault, flow process is returned step S502.

If in step S502, when receiving all, data processing module exchanges the various parameters of electric power that photovoltaic module sends, can think that then there is fault in one or more interchange photovoltaic module of not receiving parameters of electric power, then flow process enters step S503.

Certainly, if in step S502, data processing module has to receive and exchanges the parameters of electric power that photovoltaic module sends, but there are abnormal conditions in this parameters of electric power, at this moment surveys certain and exchanges photovoltaic module and judge whether it exists the flow chart of the method for fault can be as shown in Figure 6.Detection in one embodiment of the invention shown in Figure 6 exchanges photovoltaic module and judges whether to exist the method for fault to comprise:

In step S601, obtain the alternate current operation curve of a plurality of interchange photovoltaic modulies respectively, in the present embodiment, the alternate current operation curve of a plurality of interchange photovoltaic modulies is to be obtained from the electric current of the alternating current of the output of power conversion circuit and voltage by the observation circuit in its corresponding assembly inverter, sends to data processing module by its telecommunication circuit then;

In step S602, calculate the interchange averaged curve of alternate current operation curve, exchanging averaged curve is exactly to get the median that each exchanges the alternate current operation curve of photovoltaic module;

In step S603, with each alternate current operation curve that exchanges photovoltaic module with exchange averaged curve and compare;

In step S604, judge whether exchange photovoltaic module exists fault, in the present embodiment, for example each alternate current operation curve that exchanges photovoltaic module with exchange averaged curve and compare and have evident difference (two concrete difference kind and the difference size between the curve can artificially be set), can judge that then there is fault in corresponding interchange photovoltaic module, flow process enters step S503, if each alternate current operation curve that exchanges photovoltaic module with exchange averaged curve and compare and do not have evident difference, can assert that then there is not fault in corresponding interchange photovoltaic module, flow process is returned step S502.

Get back among Fig. 5, in step S503, survey the direct current photovoltaic module, judge whether the direct current photovoltaic module exists fault.In the present embodiment, detection can be undertaken by the parameters of electric power of monitoring the power conversion circuit input in each assembly inverter that exchanges photovoltaic module.At this moment survey certain direct current photovoltaic module and judge whether it exists the flow chart of the method for fault can be as shown in Figure 7.At the detection direct current photovoltaic module of one embodiment of the invention shown in Figure 7 and judge whether to exist the method for fault to comprise:

In step S701, obtain the DC operation curve of a plurality of interchange photovoltaic modulies respectively, in the present embodiment, the DC operation curve of a plurality of interchange photovoltaic modulies is to be obtained from the galvanic electric current of the input of power conversion circuit and voltage by the observation circuit in its corresponding assembly inverter, sends to data processing module by its telecommunication circuit then;

In step S702, calculate the direct current averaged curve of DC operation curve, the direct current averaged curve is exactly to get the median that each exchanges the DC operation curve of photovoltaic module;

In step S703, the DC operation curve of each direct current photovoltaic module is compared with the direct current averaged curve;

In step S704, judge whether the direct current photovoltaic module exists fault, in the present embodiment, for example each DC operation curve that exchanges photovoltaic module is compared with the direct current averaged curve and is had evident difference (two concrete difference kind and the difference size between the curve can artificially be set), can judge that then there is fault in corresponding direct current photovoltaic module, flow process enters step S504, if comparing with the direct current averaged curve, each DC operation curve that exchanges photovoltaic module do not have evident difference, can assert that then there is not fault in corresponding direct current photovoltaic module, flow process enters step S508.

Continue to get back among Fig. 5, in step S504, the DC operation curve of the direct current photovoltaic module of fault and the damage curve in the damage curve database are compared, look at whether can be complementary, discern the fault that the direct current photovoltaic module exists with this with the damage curve under certain failure situations of storing in advance.

Then, in step S505,, judge whether to have discerned fault according to the result of above-mentioned comparison.

If the judged result of step S505 is a "Yes", then enters step S506, otherwise enter step S509 and method ends.

In S506, produce the information of fault, the information of fault can comprise location of fault, kind etc., if system has discerned fault, then the information of fault can further include the correction behavior of the suggestion that fault is taked.

Then, in S507, the information of fault is shown, may be displayed on the screen of Systems Analysis Module, also may be displayed on Security Personnel's the mobile device, fault is handled as early as possible with the personnel of maintaining easily.In some cases, system even can correct fault automatically, for example work as system identification and to its panel of a certain fault, may pile up leaf or dust etc. for the direct current photovoltaic module on the some interchange photovoltaic modulies of system, make a little less than the alternating current output of this interchange photovoltaic module, what then can start this interchange photovoltaic module and be equipped with is used for manipulators such as blowing or water spray, the dust or the leaf that hide on the panel that absorbs sunlight are removed, to improve the utilization ratio of solar energy.

Certainly, if judge that in step S503 there is not fault in the direct current photovoltaic module, then flow process directly enters step S508 and assert that there is fault in the assembly inverter, and continues execution in step S506~S507, and its particular content no longer is repeated in this description for the sake of brevity.

This fault-finding method can end at step S509.

Each exchanges the mode of real-time Data Transmission between photovoltaic module and the data processing module by monitoring in the present invention, can be when photovoltaic system breaks down, detect the generation of fault in time, and then identification location of fault and kind, even the correction behavior that can take.For example, when the people steals solar energy photovoltaic system, be close-connected because each exchanges between photovoltaic module and its assembly inverter, they need disconnect the ac cable that respectively exchanges between the photovoltaic module.Because ac cable is one another in series and has formed power line, and carries out power line carrier communication, this disconnection can cause the above communication disruption of cut-off point at once.Interrupt so data processing module can detect this at once, and can judge the position that cable disconnects, data processing module can send information to Systems Analysis Module then, can also further show caution in warning system.After the Security Personnel obtains information warning, can arrest the burglar as early as possible, the maintenance personal is repair a breakdown as early as possible then, reduces the influence to normal power generation.

In addition, the present invention can also immediately monitor the abnormal work that exchanges photovoltaic module and assembly inverter, and the position and the kind of identification abnormal work, even suggestion can be taked the correction behavior.Data processing module is visited the working curve of all ac/dc photovoltaic modulies, gets the median of all curves, forms averaged curve.Working curve and averaged curve contrast with each ac/dc photovoltaic module have judged whether fault according to this.Can analyze, discern location of fault and kind from the information that direct current photovoltaic module and assembly inverter detect.For example, if the power output of assembly inverter descends, and the output of direct current photovoltaic module is normal, and then there is fault in the assembly inverter.The kind of fault can also be analyzed, be discerned to the information that detects from direct current photovoltaic module and assembly inverter.Relatively the distinctive characteristics of working curve and normalized curve (for exchanging the system that photovoltaic module is formed by a plurality of, averaged curve is exactly a normalized curve) can show the kind of fault.For example, in working curve was presented at a bit of time, power almost dropped to zero, recover normal then again, sunlight on the then during this period of time possible whole direct current photovoltaic module has all been stopped by thing, and dofunny has been removed very soon, and this is likely covering of cloud.Again for example, in working curve was presented at the similar time period of every day, the power of direct current photovoltaic module descended, and recovered normal subsequently again, and this is likely because the shade of fixtures such as trees, building.The curve of the direct current faulty components under the various faults situation is deposited in the damage curve database, by more detected the working curve of faulty components and the curve in the damage curve database is arranged, and data processing module can further be discerned fault, and action is corrected in suggestion.

At last, the present invention also has safety function.When the system maintenance personnel need safeguard or when needing emergency shutdown system near solar energy photovoltaic system, the user can import a control command in FCM fault control module, system with command transfer to data processing module, with after power line carrier communication is transferred to each assembly inverter.After the telecommunication circuit received signal in the assembly inverter, send signal and give control circuit, stop the work of power conversion circuit.At this moment, even if the direct current photovoltaic module still produces direct current, the assembly inverter does not have the output AC electricity, and this function has been eliminated a potential security threat of original solar energy photovoltaic system.

Though the present invention with preferred embodiment openly as above; but it is not to be used for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.

Claims (13)

1. solar energy photovoltaic system comprises:
A plurality of interchange photovoltaic modulies, interchange photovoltaic module string is formed in the connection that is one another in series, and is used for producing alternating current according to solar energy;
Data processing module is connected with the described photovoltaic module string that exchanges, and is used for obtaining described each by power line communication technology and exchanges the parameters of electric power of photovoltaic module, surveys and discern the unusual or fault that described solar energy photovoltaic system exists;
Systems Analysis Module is connected with described data processing module, is used for from described data processing module gathering system data and stores, analyzes, draws or show.
2. solar energy photovoltaic system according to claim 1 is characterized in that, also comprises:
FCM fault control module is connected with described data processing module, is used for initiatively input of control commands, requires described each to exchange photovoltaic module and stops to produce alternating current.
3. solar energy photovoltaic system according to claim 2, it is characterized in that, described each interchange photovoltaic module comprises direct current photovoltaic module and assembly inverter, and the cable joint of described direct current photovoltaic module is connected with the input cable joint of described assembly inverter.
4. solar energy photovoltaic system according to claim 3 is characterized in that, described assembly inverter has the inverter main body, and described inverter main body comprises:
Power conversion circuit, its input is connected with described direct current photovoltaic module, is used for direct current is converted into alternating current;
Observation circuit is in parallel with described power conversion circuit, is used to monitor the parameters of electric power of described power conversion circuit both sides;
Telecommunication circuit, output cable joint with described observation circuit and described assembly inverter is connected respectively, the parameters of electric power and the described data processing module that are used for obtaining according to described observation circuit communicate, and perhaps receive the control command of described FCM fault control module input;
Control circuit is connected with described power conversion circuit, observation circuit and telecommunication circuit respectively, closes described power conversion circuit when being used for the control command that receives according to described telecommunication circuit or described monitoring circuit monitors to the abnormal electrical force parameter.
5. solar energy photovoltaic system according to claim 4 is characterized in that, described data processing module comprises:
Power line communication circuits is connected with the described photovoltaic module string that exchanges, and is used for communicating with described a plurality of photovoltaic modulies that exchange by power line communication technology;
Internal memory is connected with described power line communication circuits, is used to obtain and store the ac/dc working curve and the various direct current damage curve data of described a plurality of interchange photovoltaic modulies;
Data processing circuit, be connected with described internal memory, the ac/dc working curve that is used for storing according to described internal memory calculates the ac/dc averaged curve, each ac/dc working curve and described ac/dc averaged curve that exchanges photovoltaic module is compared to judge whether corresponding ac/dc photovoltaic module exists fault, and each DC operation curve and various direct current damage curve that exchanges photovoltaic module compared, judge which kind of fault described each interchange photovoltaic module exists;
Network communications circuits, be connected with described data processing circuit, power line communication circuits, Systems Analysis Module and FCM fault control module respectively, be used for communicating according to the result and the described Systems Analysis Module of described data processing circuit, perhaps the control command with described FCM fault control module input is sent to each interchange photovoltaic module.
6. solar energy photovoltaic system according to claim 5 is characterized in that, described internal memory comprises:
The working curve database is connected with data processing circuit with described power line communication circuits respectively, is used to obtain and store the ac/dc working curve data of described a plurality of interchange photovoltaic modulies;
The damage curve database is connected with described data processing circuit, is used for storing in advance the direct current damage curve data under the various failure situations.
7. solar energy photovoltaic system according to claim 4 is characterized in that, described parameters of electric power comprises the electric current or the voltage of direct current/alternating current.
8. solar energy photovoltaic system according to claim 1 is characterized in that, described solar energy photovoltaic system also comprises:
Warning system is connected with described Systems Analysis Module, is used for when described Systems Analysis Module detects described solar energy photovoltaic system and has fault the information of described fault is outwards given the alarm.
9. the fault-finding method of a solar energy photovoltaic system comprises step:
A. survey and exchange photovoltaic module, judge whether described interchange photovoltaic module exists fault;
If there is fault in B. described interchange photovoltaic module, then survey the direct current photovoltaic module, judge whether described direct current photovoltaic module exists fault;
If there is fault in C. described direct current photovoltaic module, then the DC operation curve of the direct current photovoltaic module of fault and the damage curve in the damage curve database are compared;
D. according to the result of above-mentioned comparison, judge whether to have discerned described fault;
If E. discerned described fault, then produce the information of described fault;
F. the information with described fault shows;
If there is not fault in G. described direct current photovoltaic module, assert that then there is fault in the assembly inverter, and continue execution in step E~F.
10. fault-finding method according to claim 9 is characterized in that, surveys described interchange photovoltaic module and judges whether to exist fault to comprise step:
Obtain the alternate current operation curve of described a plurality of interchange photovoltaic modulies respectively;
Calculate the interchange averaged curve of described alternate current operation curve;
The described alternate current operation curve that each exchanges photovoltaic module is compared with the described averaged curve that exchanges;
Judge whether described interchange photovoltaic module exists fault.
11. fault-finding method according to claim 9 is characterized in that, surveys described direct current photovoltaic module and judges whether to exist fault to comprise step:
Obtain the DC operation curve of described a plurality of direct current photovoltaic modulies respectively;
Calculate the direct current averaged curve of described DC operation curve;
The DC operation curve of described each direct current photovoltaic module is compared with described direct current averaged curve;
Judge whether described direct current photovoltaic module exists fault.
12. fault-finding method according to claim 9 is characterized in that, the information of described fault comprises position and the kind that described fault takes place.
13. fault-finding method according to claim 12 is characterized in that, the information of described fault also comprises the correction behavior at the suggestion of described fault.
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CN103853092A (en) * 2014-02-28 2014-06-11 苏州市职业大学 Photovoltaic module parameter monitoring device based on programmable logic controller
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