CN106771957A - Photovoltaic generation input circuit fault detection method, apparatus and system - Google Patents

Photovoltaic generation input circuit fault detection method, apparatus and system Download PDF

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Publication number
CN106771957A
CN106771957A CN201510860136.4A CN201510860136A CN106771957A CN 106771957 A CN106771957 A CN 106771957A CN 201510860136 A CN201510860136 A CN 201510860136A CN 106771957 A CN106771957 A CN 106771957A
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China
Prior art keywords
collector
shoe gear
output current
current value
level
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CN201510860136.4A
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CN106771957B (en
Inventor
张传升
郭凯
宋彬彬
李新连
左宁
于涛
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Shenhua (Beijing) photovoltaic technology research and Development Co., Ltd.
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Shenhua Group Corp Ltd
National Institute of Clean and Low Carbon Energy
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Abstract

The invention discloses a kind of photovoltaic generation input circuit fault detection method, apparatus and system.Wherein, the method includes：The output current value of first order collector-shoe gear is gathered by the current detection circuit for being arranged on first order collector-shoe gear output end；In the output current of each first order collector-shoe gear that second level collector-shoe gear is accessed, output current maximum is found out；Calculate the difference of output current maximum and the output current value of first order collector-shoe gear；In the case of the inverse of the number of the input branch road that the ratio of difference and output current maximum is accessed more than or equal to first order collector-shoe gear, judge that first order collector-shoe gear has input branch circuit break.Due to gathering the output current value of first order collector-shoe gear by setting current detection circuit in first order collector-shoe gear output end, the first order collector-shoe gear of input branch circuit break can be tested with, it is achieved thereby that finding the purpose of photovoltaic generation input circuit trouble location by less detection circuit.

Description

Photovoltaic generation input circuit fault detection method, apparatus and system
Technical field
The present invention relates to photovoltaic art, in particular it relates to a kind of photovoltaic generation input circuit fault detect side Method, apparatus and system.
Background technology
Large-sized photovoltaic power station is made up of photovoltaic module.The output current of photovoltaic module is needed by the dress that confluxes Put and collect, then collect by upper level collector-shoe gear step by step again, be then input to inverter.
In order to ensure the safe operation of photovoltaic plant, using monitoring collector-shoe gear, each melts some correlation techniques The mode of disconnected device state finds out the trouble location of photovoltaic generation input circuit.
But, this mode needs to use substantial amounts of detection circuit, relatively costly.
The content of the invention
In view of this, it is an object of the invention to provide a kind of photovoltaic generation input circuit fault detect side Method, apparatus and system by less detection circuit finding the mesh of photovoltaic generation input circuit trouble location 's.
In the one side of the embodiment of the present invention, the present invention provides a kind of photovoltaic generation input circuit failure Detection method.Wherein, the photovoltaic generation input circuit using classification bus structure, conflux by the classification The collector-shoe gear for being used to access photovoltaic module output current in structure is first order collector-shoe gear, for accessing The collector-shoe gear of the output current of the first order collector-shoe gear is second level collector-shoe gear, the same second level The input branch road that each first order collector-shoe gear that collector-shoe gear is accessed is respectively connected to number is identical and light Volt component design parameter is identical.Methods described includes：Exported by being arranged on the first order collector-shoe gear The current detection circuit at end gathers the output current value of the first order collector-shoe gear, is converged in any second level In the output current of each first order collector-shoe gear that stream device is accessed, output current maximum is found out, Calculate any first order remittance that the output current maximum is accessed with any second level collector-shoe gear The difference of the output current value of device is flowed, is more than with the ratio of the output current maximum in the difference Or in the case of the inverse of the number of the input branch road accessed equal to any first order collector-shoe gear, sentence Fixed any first order collector-shoe gear has input branch circuit break.
Alternatively, methods described also includes：Output electricity according to the first order collector-shoe gear for collecting Flow valuve and the classification bus structure, count the output current value of any collector-shoe gear, judge described Whether the output current value of any collector-shoe gear is equal to zero, in the output current value of any collector-shoe gear In the case of null, the output open circuit of any collector-shoe gear is judged or for accessing any remittance Flow the input branch circuit break of the one-level collector-shoe gear high of the output current of device.
Alternatively, whether the output current value for judging any collector-shoe gear includes equal to zero：According to institute Classification bus structure is stated, from highest collector-shoe gear to first order collector-shoe gear, judges that each confluxes step by step Whether the output current value of device is equal to zero.
Alternatively, methods described also includes：Measurement period is set.It is described by being arranged on the first order The current detection circuit of collector-shoe gear output end gathers the output current value bag of the first order collector-shoe gear Include：In each measurement period, by the current detecting for being arranged on the first order collector-shoe gear output end Circuit is gathered and adds up output current value of the first order collector-shoe gear in each measurement period, is obtained Accumulative output current value of the first order collector-shoe gear in each measurement period.Described according to collection The output current value and the classification bus structure of the first order collector-shoe gear for arriving, count any The output current value of collector-shoe gear includes：According to the first order collector-shoe gear in each measurement period Accumulative output current value and the classification bus structure, count each collector-shoe gear in each statistics week Accumulative output current value in phase.It is described according to the classification bus structure, from highest collector-shoe gear to Whether first order collector-shoe gear, the output current value of each collector-shoe gear is judged step by step is included equal to zero：Press According to the classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, each is judged step by step Whether accumulative output current value of the collector-shoe gear in each measurement period is equal to zero.
Alternatively, the sample frequency in the measurement period is less than 30 seconds.
Alternatively, it is described to be adopted by being arranged on the current detection circuit of the first order collector-shoe gear output end The output current value for collecting the first order collector-shoe gear includes：By being arranged on the first order collector-shoe gear The current detection circuit collection first order collector-shoe gear of output end is real-time defeated the current detection moment Go out current value, obtain real-time output current value of the first order collector-shoe gear at the current detection moment.Institute The output current value and the classification bus structure according to the first order collector-shoe gear for collecting are stated, The output current value for counting any collector-shoe gear includes：Examined currently according to the first order collector-shoe gear The real-time output current value and the classification bus structure at moment are surveyed, each collector-shoe gear is counted and is being worked as The real-time output current value of preceding detection moment.It is described according to the classification bus structure, conflux from the superlative degree Device judges whether the output current value of each collector-shoe gear is equal to zero bag step by step to first order collector-shoe gear Include：According to the classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, sentence step by step Whether real-time output current value of each collector-shoe gear at the current detection moment that break is equal to zero.
Alternatively, the level of collector-shoe gear order from high in the end is in the classification bus structure：4th Level collector-shoe gear, third level collector-shoe gear, second level collector-shoe gear, first order collector-shoe gear.It is described to press According to the classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, each is judged step by step Whether the output current value of collector-shoe gear includes equal to zero：Judge the output current value of fourth stage collector-shoe gear Whether zero is equal to, be not equal in the case of zero in the output current value of the fourth stage collector-shoe gear, from institute State in the third level collector-shoe gear of fourth stage collector-shoe gear access, select any one third level collector-shoe gear, Judge whether the output current value of selected any one third level collector-shoe gear is equal to zero, described any The output current value of individual third level collector-shoe gear is not equal in the case of zero, is converged from described any one third level In the second level collector-shoe gear that stream device is accessed, any one second level collector-shoe gear is selected, judge selected Any one second level collector-shoe gear output current value whether be equal to zero, described any one second level converge The output current value for flowing device is not equal in the case of zero, judges that described any one second level collector-shoe gear connects Whether the output current value of each first order collector-shoe gear for entering is equal to zero, if described any one third level Whether in the second level collector-shoe gear that collector-shoe gear is accessed, output current value is not judged also null Second level collector-shoe gear, whether the null second level collector-shoe gear of output current value is not judged from described In reselect any one second level collector-shoe gear, back within it is described judge it is selected any one the Two grades of whether null steps of the output current value of collector-shoe gear, if described any one third level is confluxed In the second level collector-shoe gear that device is accessed, in the absence of not being judged output current value whether null the Whether two grades of collector-shoe gears, are never judged in the null third level collector-shoe gear of output current value again Any one third level collector-shoe gear is selected, described selected any one third level of judgement is backed within and is converged Flow the whether null step of output current value of device.Wherein, it is described to calculate the output current maximum It is worth the output current value of any first order collector-shoe gear accessed with any second level collector-shoe gear Difference includes：Finding out each first order collector-shoe gear that described any one second level collector-shoe gear is accessed In output current maximum after, the first order for being not equal to zero for each output current value is confluxed dress Put, the output current value of the output current maximum and targeted first order collector-shoe gear is calculated one by one Difference.The ratio in the difference and the output current maximum is more than or equal to described any In the case of the inverse of the number of the input branch road that first order collector-shoe gear is accessed, described any first is judged Level collector-shoe gear have input branch circuit break include：The first order for being not equal to zero for each output current value is converged Stream device, targeted first is more than or equal in the difference with the ratio of the output current maximum In the case of the inverse of the number of level collector-shoe gear input branch road, targeted first order collector-shoe gear is judged There is input branch circuit break.
Alternatively, the number of the input branch road that the first order collector-shoe gear is accessed is less than or equal to 16 tunnels. The number of the input branch road that the second level collector-shoe gear is accessed is more than or equal to 3 tunnels.The classification is confluxed The level of structure is less than or equal to 4 grades.
Alternatively, the photovoltaic module design parameter includes：The model of the photovoltaic module, capacity, number Mesh, connected mode (string or simultaneously), output voltage, electric current index, fuse types, cable model with Length.
At second aspect of the embodiment of the present invention, the present invention provides a kind of photovoltaic generation input circuit failure Detection means.Wherein, the photovoltaic generation input circuit is using classification bus structure.The classification is confluxed The collector-shoe gear for being used to access photovoltaic module output current in structure is first order collector-shoe gear, for accessing The collector-shoe gear of the output current of the first order collector-shoe gear is second level collector-shoe gear, the same second level The input branch road that each first order collector-shoe gear that collector-shoe gear is accessed is respectively connected to number is identical and light Volt component design parameter is identical.Described device includes：Acquisition module, is configured to be arranged on described The current detection circuit of first order collector-shoe gear output end gathers the output electricity of the first order collector-shoe gear Flow valuve.Maximum searching modul, is configured as each first order accessed in any second level collector-shoe gear In the output current value of collector-shoe gear, output current maximum is found out.Difference calculating module, is configured To calculate any first order that the output current maximum is accessed with any second level collector-shoe gear The difference of the output current value of collector-shoe gear.Fault determination module, be configured as the difference with it is described The ratio of output current maximum is more than or equal to the input branch that any first order collector-shoe gear is accessed In the case of the inverse of the number on road, judge that any first order collector-shoe gear has input branch circuit break.
Alternatively, described device also includes：Statistical module, is configured as according to described first for collecting The output current value and the classification bus structure of level collector-shoe gear, count the defeated of any collector-shoe gear Go out current value.Electric current judge module, the output current value for being configured as judging any collector-shoe gear is It is no to be equal to zero.Wherein, the fault determination module is additionally configured to the output in any collector-shoe gear In the case of current value is null, the output open circuit of any collector-shoe gear or described for accessing is judged The input branch circuit break of the one-level collector-shoe gear high of the output current of any collector-shoe gear.
Alternatively, the electric current judge module is configured as according to the classification bus structure, from the superlative degree Collector-shoe gear judges whether the output current value of each collector-shoe gear is equal to step by step to first order collector-shoe gear Zero.
Alternatively, described device also includes：Cycle setup module, is configured as setting measurement period.Institute Acquisition module is stated to be configured as in each measurement period, it is defeated by being arranged on the first order collector-shoe gear The current detection circuit for going out end is gathered and adds up the first order collector-shoe gear in each measurement period Output current value, obtains accumulative output current of the first order collector-shoe gear in each measurement period Value.The statistical module is configured as tired in each measurement period according to the first order collector-shoe gear Meter output current value and the classification bus structure, count each collector-shoe gear in each measurement period Interior accumulative output current value.The electric current judge module is configured as according to the classification bus structure, From highest collector-shoe gear to first order collector-shoe gear, judge each collector-shoe gear in each statistics week step by step Whether the accumulative output current value in the phase is equal to zero.
Alternatively, the acquisition module is configured to be arranged on the first order collector-shoe gear output end Current detection circuit gather the real-time output current of the first order collector-shoe gear at the current detection moment Value, obtains real-time output current value of the first order collector-shoe gear at the current detection moment.The statistics Module is configured as the real-time output current value at the current detection moment according to the first order collector-shoe gear And the classification bus structure, count real-time output electricity of each collector-shoe gear at the current detection moment Flow valuve.The electric current judge module is configured as according to the classification bus structure, is confluxed dress from the superlative degree First order collector-shoe gear is put, real-time output electricity of each collector-shoe gear at the current detection moment is judged step by step Whether flow valuve is equal to zero.
Alternatively, the level of collector-shoe gear order from high in the end is in the classification bus structure：4th Level collector-shoe gear, third level collector-shoe gear, second level collector-shoe gear, first order collector-shoe gear.The electricity Stream judge module includes：Level Four electric current judging submodule, is configured as judging the defeated of fourth stage collector-shoe gear Go out whether current value is equal to zero.Three-level selects submodule, is configured as in the fourth stage collector-shoe gear Output current value is not equal in the case of zero, and the third level accessed from the fourth stage collector-shoe gear is confluxed dress In putting, any one third level collector-shoe gear is selected.Tertiary current judging submodule, is configured as judging institute Whether the output current value of any one third level collector-shoe gear of selection is equal to zero.Two grades of selection submodules, It is configured as being not equal in the case of zero in the output current value of any one third level collector-shoe gear, from In the second level collector-shoe gear that described any one third level collector-shoe gear is accessed, any one second level is selected to converge Stream device.Two-level current judging submodule, is configured as judging that selected any one second level is confluxed dress Whether the output current value put is equal to zero.One-level electric current judging submodule, be configured as it is described any one The output current value of second level collector-shoe gear is not equal in the case of zero, judges that described any one second level is converged Whether the output current value of each first order collector-shoe gear that stream device is accessed is equal to zero.Two grades of gravity treatment submodules Block, if in being configured as the second level collector-shoe gear that described any one third level collector-shoe gear is accessed, also Whether the null second level collector-shoe gear of output current value is not judged, output is not judged from described Whether any one second level collector-shoe gear is reselected in the null second level collector-shoe gear of current value, weight Described selected any one second level of judgement of the two-level current judging submodule execution is newly triggered to conflux The whether null step of the output current value of device.Three-level gravity treatment submodule, if be configured as described In the second level collector-shoe gear that any one third level collector-shoe gear is accessed, in the absence of not being judged output current Value whether null second level collector-shoe gear, be never judged output current value the whether null 3rd Any one third level collector-shoe gear is reselected in level collector-shoe gear, tertiary current described in retriggered judges Submodule perform the output current value for judging selected any one third level collector-shoe gear whether etc. The step of zero.Wherein, the difference calculating module is configured as being searched in the maximum searching modul The output current gone out in each first order collector-shoe gear that described any one second level collector-shoe gear is accessed is most After big value, zero first order collector-shoe gear is not equal to for each output current value, calculates described one by one The difference of output current value maximum and the output current value of targeted first order collector-shoe gear.The event Barrier determination module is configured as being not equal to for each output current value zero first order collector-shoe gear, in institute State difference and be more than or equal to targeted first order collector-shoe gear with the ratio of the output current maximum In the case of the inverse of the number for being input into branch road, judge that targeted first order collector-shoe gear has input branch road Open circuit.
At second aspect of the embodiment of the present invention, the present invention provides a kind of photovoltaic generation input circuit failure Detecting system.Wherein, the system includes：Photovoltaic generation input circuit, wherein, the photovoltaic generation Input circuit uses classification bus structure, wherein, for accessing photovoltaic module in the classification bus structure The collector-shoe gear of output current is first order collector-shoe gear, for accessing the defeated of the first order collector-shoe gear Go out the collector-shoe gear of electric current for second level collector-shoe gear, same second level collector-shoe gear access each first The number of the input branch road that level collector-shoe gear is respectively connected to is identical and photovoltaic module design parameter is identical；With And, it is arranged on the current detection circuit of the first order collector-shoe gear output end；And, using the present invention The data processing equipment of the photovoltaic generation input circuit fault detection method described in any embodiment.
Alternatively, the system also includes：Data acquisition unit, is configured as each current detection circuit The output current value for collecting is collected, and the output current value after collecting is transferred to the data processing Device.
Because photovoltaic generation input circuit of the invention is using classification bus structure, wherein, the classification converges The collector-shoe gear for being used to access photovoltaic module output current in flow structure is first order collector-shoe gear, for connecing The collector-shoe gear for entering the output current of the first order collector-shoe gear is second level collector-shoe gear, same second Level collector-shoe gear access each first order collector-shoe gear be respectively connected to input branch road number it is identical and Photovoltaic module design parameter is identical, by the current detecting for being arranged on the first order collector-shoe gear output end Circuit gathers the output current value of the first order collector-shoe gear, is accessed in any second level collector-shoe gear In the output current value of each first order collector-shoe gear, output current maximum is found out, calculated described defeated Go out current maxima defeated with any first order collector-shoe gear that any second level collector-shoe gear is accessed Go out the difference of current value, be more than or equal in the difference and the ratio of the output current maximum described In the case of the inverse of the number of the input branch road that any first order collector-shoe gear is accessed, judge described any First order collector-shoe gear has input branch circuit break.It can be seen that, the present invention is exported by first order collector-shoe gear End sets current detection circuit to gather the output current value of first order collector-shoe gear, you can by above-mentioned place Reason logic detection goes out the first order collector-shoe gear for having input branch circuit break, it is achieved thereby that by less detection Circuit finds the purpose of photovoltaic generation input circuit trouble location.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute the part of specification, with Following specific embodiment is used to explain the present invention together, but is not construed as limiting the invention. In accompanying drawing：
Fig. 1 is a kind of structural representation of the photovoltaic generation input circuit according to an exemplary embodiment Figure.
Fig. 2 is the stream of the photovoltaic generation input circuit fault detection method according to an exemplary embodiment Cheng Tu.
Fig. 3 is the photovoltaic generation input circuit fault detection method according to another exemplary embodiment Flow chart.
Fig. 4 is the photovoltaic generation input circuit fault detection method according to further example embodiment Flow chart.
Fig. 5 is the photovoltaic generation input circuit fault detection method according to further example embodiment Flow chart.
Fig. 6 is the frame of the photovoltaic generation input circuit failure detector according to an exemplary embodiment Figure.
Fig. 7 is the photovoltaic generation input circuit failure detector according to another exemplary embodiment Block diagram.
Fig. 8 is the frame of the photovoltaic generation input circuit fault detection system according to an exemplary embodiment Figure.
Specific embodiment
Specific embodiment of the invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that Specific embodiment described herein is merely to illustrate and explain the present invention, and is not limited to this hair It is bright.
Fig. 1 is a kind of structural representation of the photovoltaic generation input circuit according to an exemplary embodiment Figure.As shown in figure 1, the implementation environment can include：By photovoltaic module is by series connection and/or composes in parallel Photovoltaic array 110, first order collector-shoe gear 130, for the output current of photovoltaic array 110 to be connect Enter input branch road 120 to first order collector-shoe gear 130, second level collector-shoe gear 150, for by The output current of one-level collector-shoe gear 130 be linked into second level collector-shoe gear 150 input branch road 140, Third level collector-shoe gear 170, for the output current of second level collector-shoe gear 150 to be linked into the third level The input branch road 160 of collector-shoe gear 170, fourth stage collector-shoe gear 190 and, for by the third level The output current of collector-shoe gear 170 is linked into the input branch road 180 of fourth stage collector-shoe gear 190.
Wherein, the number of the input branch road 120 that each first order collector-shoe gear 130 is respectively connected to is identical, And the photovoltaic module design parameter of the photovoltaic array 110 for accessing is identical.In a kind of possible implementation method, The number of the input branch road that the collector-shoe gear of same level is respectively connected to is identical and design parameter is identical.
Wherein, the output end in each first order collector-shoe gear 130 is each provided with current detecting electricity respectively Road 131, the output current value for gathering first order collector-shoe gear 130.
Wherein, each current detection circuit 131 can be connected with data acquisition unit 100, data acquisition unit 100 can be connected with data processing equipment 101.The data acquisition unit 100, can be used for each The output current value that current detection circuit 131 is collected is collected, and is transferred to data processing equipment 101.Data processing equipment 101 can be used for running the software for realizing the inventive method.
For example, data acquisition unit 100 can be the commercial number of independently developed data collecting card or purchase According to collector, such as the PCI-6224 of NI companies.Data processing equipment 101 can be computer or Work station.Current detection circuit 131 can also be according to prior art designed, designed or purchase.
Fig. 2 is the stream of the photovoltaic generation input circuit fault detection method according to an exemplary embodiment Cheng Tu.The photovoltaic generation input circuit that the method is related to is using classification bus structure.Wherein, the classification The collector-shoe gear for being used to access photovoltaic module output current in bus structure is first order collector-shoe gear, is used for The collector-shoe gear of output current of the first order collector-shoe gear is accessed for second level collector-shoe gear, same the The number of the input branch road that each first order collector-shoe gear that two grades of collector-shoe gears are accessed is respectively connected to is identical, And photovoltaic module design parameter is identical.The method can apply to various intelligent terminals, for example, computer Or work station.For example, can apply to the computer 101 shown in Fig. 1.As shown in Fig. 2 the party Method can include：
In step 210, by being arranged on the current detection circuit of the first order collector-shoe gear output end Gather the output current value of the first order collector-shoe gear.
In a step 220, any second level collector-shoe gear access each first order collector-shoe gear it is defeated Go out in current value, find out output current maximum.
In step 230, the output current maximum is calculated to be connect with any second level collector-shoe gear The difference of the output current value of any first order collector-shoe gear for entering.
In step 240, it is more than or equal to institute with the ratio of the output current maximum in the difference In the case of the inverse of the number for stating the input branch road that any first order collector-shoe gear is accessed, described appointing is judged One first order collector-shoe gear has input branch circuit break.
For example, the first order collector-shoe gear number for setting photovoltaic plant is m, conflux the same second level of access dress Input number of branches that each first order collector-shoe gear for putting is accessed is identical, photovoltaic module design parameter phase Together.Such as design parameter can include the model of photovoltaic module, capacity, number, connected mode (string or And), output voltage, electric current index, fuse types, cable model and length etc..Assuming that every 1 The input number of branches that one-level collector-shoe gear is accessed all is n.Then：
The output current of each first order collector-shoe gear is respectively：
I1=∑ I1j(j=1,2 ..., n), j represents branch road sequence number.
I2=∑ I2j(j=1,2 ..., n)
…
Im=∑ Imj(j=1,2 ..., n)
Because input local road design parameter is identical, it is believed that under identical sunshine condition, each branch road Input current is identical, that is, have Ik1=Ik2=...=Ikj(k represents collector-shoe gear sequence number).If the first order is confluxed Device is input into no open circuit in branch road, then I1=I2=...=Im.If the first order collector-shoe gear of serial number k Input branch road there occurs open circuit, then Ik=∑ Ikj(j=1,2 ..., p) (p<n).Furthermore, it is possible to learn p/n=Ik/Im。 The number of breaking branch road is n-p=n (1-I i.e. in the devicek/Im).That is, n (1-Ik/Im) >=1, (Im-Ik) /Im≥1/n.Therefore, for be linked into same second level collector-shoe gear each first order collector-shoe gear it is defeated Go out in electric current, output current maximum ImaxIt is certain to meet (Im-Ik)/Im≥1/n.Therefore, the present invention is logical Cross and calculate the output current maximum of the first order collector-shoe gear for accessing same second level collector-shoe gear and appoint The difference of the output current value of one first order collector-shoe gear, by difference and the ratio of the output current maximum Inverse more than collector-shoe gear input number of branches is compared, it can be determined that goes out any first order and converges Whether stream device has input branch circuit break.
In a kind of possible implementation method, it is contemplated that after more than 16 tunnels, accounted in total current per road electric current Than being 6%, enter into error range, it is impossible to judge.Therefore, the first order collector-shoe gear is accessed Input branch road number be less than or equal to 16 tunnels.There are 3 tunnels to be input into view of second level collector-shoe gear, When can cause that this grade of electric current compares, it is ensured that have two reference values so that comparative result is more reliable, because This, the number of the input branch road that the second level collector-shoe gear is accessed is more than or equal to 3 tunnels.Wherein, institute The level for stating classification bus structure is less than or equal to 4 grades.
It can be seen that, the present invention gathers the by setting current detection circuit in first order collector-shoe gear output end The output current value of one-level collector-shoe gear, you can go out to have input branch circuit break by above-mentioned treatment logic detection First order collector-shoe gear, it is achieved thereby that finding photovoltaic generation input circuit by less detection circuit The purpose of trouble location.
Fig. 3 is the photovoltaic generation input circuit fault detection method according to another exemplary embodiment Flow chart.As shown in figure 3, the method can include：
In the step 310, by being arranged on the current detection circuit of the first order collector-shoe gear output end Gather the output current value of the first order collector-shoe gear.
In step 311, the output current value according to the first order collector-shoe gear for collecting and institute Classification bus structure is stated, the output current value of any one collector-shoe gear is counted.
For example, according to classification bus structure as shown in Figure 1, any second level can be calculated and confluxed dress Put, third level collector-shoe gear, the output current value of fourth stage collector-shoe gear.
In step 312, judge whether the output current value of any collector-shoe gear is equal to zero.
In step 313, in the case of the output current value of any collector-shoe gear is null, sentence The output open circuit of fixed any collector-shoe gear or the output current for accessing any collector-shoe gear One-level collector-shoe gear high input branch circuit break.
In step 320, it is electric in the output of each first order collector-shoe gear of any second level collector-shoe gear In flow valuve, output current maximum is found out.
In a step 330, the output current maximum is calculated to be connect with any second level collector-shoe gear The difference of the output current value of any first order collector-shoe gear for entering.
In step 340, it is more than or equal to institute with the ratio of the output current maximum in the difference In the case of the inverse of the number for stating the input branch road that any first order collector-shoe gear is accessed, described appointing is judged One first order collector-shoe gear has input branch circuit break.
It is understood that during normal power generation, any collector-shoe gear is normal (disconnection), then The electric current for accessing all input branch roads of the collector-shoe gear can be confluxed by the collector-shoe gear, and all of The probability very little that input branch road is not exported simultaneously.Therefore, the output current value in any collector-shoe gear is equal to In the case of zero, it is possible to determine that the output of any collector-shoe gear is breaking or for accessing any dress that confluxes The input branch circuit break of the one-level collector-shoe gear high of the output current put.
For example, if the output current value of certain third level collector-shoe gear is equal to zero, can be determined that this The output open circuit of three-level collector-shoe gear or for accessing the output current of the third level collector-shoe gear the The input branch circuit break of level Four collector-shoe gear.
In the present embodiment, due to judge first order collector-shoe gear whether have input branch circuit break before, Whether the null simple judgement of output current value to collector-shoe gear is first passed through, detects that collector-shoe gear is It is no to have the input branch circuit break for exporting one-level collector-shoe gear breaking or high, it is out of order such that it is able to detect as early as possible Position, improves detection efficiency.
Fig. 4 is the photovoltaic generation input circuit fault detection method according to further example embodiment Flow chart.As shown in figure 4, the method can include：
In step 410, by being arranged on the current detection circuit of the first order collector-shoe gear output end Gather the output current value of the first order collector-shoe gear.
For example, measurement period can be set.In each measurement period, by being arranged on the first order The current detection circuit of collector-shoe gear output end is gathered and adds up the first order collector-shoe gear and united at each Output current value in the meter cycle, obtains the first order collector-shoe gear accumulative in each measurement period Output current value.
Again for example, can be adopted by being arranged on the current detection circuit of the first order collector-shoe gear output end Collect real-time output current value of the first order collector-shoe gear at the current detection moment, obtain the first order Real-time output current value of the collector-shoe gear at the current detection moment.
In step 411, output current value and institute according to the first order collector-shoe gear for collecting Classification bus structure is stated, the output current value of each collector-shoe gear is counted.
For example, according to classification bus structure as shown in Figure 1, can calculate each second level collector-shoe gear, The output current value of third level collector-shoe gear, fourth stage collector-shoe gear.
A kind of possible implementation method, with reference to the implementation method of above-mentioned setting measurement period, can be according to institute Accumulative output current value and the classification of the first order collector-shoe gear in each measurement period is stated to conflux Structure, counts accumulative output current value of each collector-shoe gear in each measurement period.
Alternatively possible implementation method, with reference to above-mentioned detection first order collector-shoe gear at the current detection moment Real-time output current value implementation method, can be according to the first order collector-shoe gear in current detection The real-time output current value and the classification bus structure carved, count each collector-shoe gear and are examined currently Survey the real-time output current value at moment.
In step 412, according to the classification bus structure, converged from highest collector-shoe gear to the first order Stream device, judges whether the output current value of each collector-shoe gear is equal to zero step by step.
A kind of possible implementation method, with reference to the implementation method of above-mentioned setting measurement period, can be according to institute Classification bus structure is stated, from highest collector-shoe gear to first order collector-shoe gear, judges that each confluxes step by step Whether accumulative output current value of the device in each measurement period is equal to zero.
Alternatively possible implementation method, with reference to above-mentioned detection first order collector-shoe gear at the current detection moment Real-time output current value implementation method, can conflux from the superlative degree according to the classification bus structure Device judges real-time output of each collector-shoe gear at the current detection moment step by step to first order collector-shoe gear Whether current value is equal to zero.
In step 413, in the case of the output current value of any collector-shoe gear is null, institute is judged State the output open circuit of any collector-shoe gear or the height for accessing the output current of any collector-shoe gear The input branch circuit break of one-level collector-shoe gear.
A kind of possible implementation method, with reference to the implementation method of above-mentioned setting measurement period, can work as any In the case of accumulative output current value of the collector-shoe gear in certain measurement period is null, described appointing is judged The output open circuit of one collector-shoe gear or the one-level high for accessing the output current of any collector-shoe gear The input branch circuit break of collector-shoe gear.
Alternatively possible implementation method, with reference to above-mentioned detection first order collector-shoe gear at the current detection moment Real-time output current value implementation method, any collector-shoe gear can be worked as real-time at the current detection moment In the case of output current value is null, the output open circuit of any collector-shoe gear is judged or for accessing The input branch circuit break of the one-level collector-shoe gear high of the output current of any collector-shoe gear.
At step 420, any second level collector-shoe gear access each first order collector-shoe gear it is defeated Go out in current value, find out output current maximum.
A kind of possible implementation method, with reference to the implementation method of above-mentioned setting measurement period, can be for every Individual measurement period, each first order collector-shoe gear accessed in any second level collector-shoe gear is all in the statistics In accumulative output current value in phase, accumulative output current maximum is found out.
Alternatively possible implementation method, with reference to above-mentioned detection first order collector-shoe gear at the current detection moment Real-time output current value implementation method, can any second level collector-shoe gear access each first Level collector-shoe gear finds out the output electricity at current time in the real-time output current value at current detection moment Stream maximum.
In step 430, the output current maximum is calculated to be connect with any second level collector-shoe gear The difference of the output current value of any one first order collector-shoe gear for entering.
A kind of possible implementation method, with reference to the implementation method of above-mentioned setting measurement period, can be for every Individual measurement period, calculates each first order collector-shoe gear of any second level collector-shoe gear access in the statistics The output current maximum in accumulative output current value in cycle, with any second level collector-shoe gear The difference of accumulative output current value of any one first order collector-shoe gear for accessing in the measurement period.
Alternatively possible implementation method, with reference to above-mentioned detection first order collector-shoe gear at the current detection moment Real-time output current value implementation method, can calculate that any second level collector-shoe gear accesses each the One-level collector-shoe gear the real-time output current value at current detection moment maximum, with described any second Real-time output current of any one first order collector-shoe gear that level collector-shoe gear is accessed at the current detection moment The difference of value.
In step 440, it is more than or equal to institute with the ratio of the output current maximum in the difference In the case of the inverse of the number for stating the input branch road of any one first order collector-shoe gear access, judge described Any one first order collector-shoe gear has input branch circuit break.
A kind of possible implementation method, with reference to the implementation method of above-mentioned setting measurement period, can counted The ratio of the output current maximum in the difference for calculating and accumulative output current value is more than or equal to described In the case of the inverse of the number of the input branch road that any one first order collector-shoe gear is accessed, described appointing is judged One first order collector-shoe gear has input branch circuit break.
Alternatively possible implementation method, with reference to above-mentioned detection first order collector-shoe gear at the current detection moment Real-time output current value implementation method, can be in the reality at the difference that is calculated and current detection moment When output current value the ratio of maximum be more than or equal to described any one first order collector-shoe gear and access Input branch road number inverse in the case of, judge that described any one first order collector-shoe gear has input Branch circuit break.
In the present embodiment, due to judge first order collector-shoe gear whether have input branch circuit break before, First whether the output current value step by step to each collector-shoe gear judges equal to zero, as long as so that certain converges Stream device has input branch circuit break, it is possible to detects as early as possible, improves detection efficiency.
Fig. 5 is the photovoltaic generation input circuit fault detection method according to further example embodiment Flow chart.In the present embodiment, in the classification bus structure collector-shoe gear level from high in the end suitable Sequence is：Fourth stage collector-shoe gear, third level collector-shoe gear, second level collector-shoe gear, the first order are confluxed dress Put.As shown in figure 5, the method can include：
In step 510, by being arranged on the current detection circuit of the first order collector-shoe gear output end Gather the output current value of the first order collector-shoe gear.
In step 511, output current value and institute according to the first order collector-shoe gear for collecting Classification bus structure is stated, fourth stage collector-shoe gear, third level collector-shoe gear, the second level is counted and is confluxed dress Put, the output current value of first order collector-shoe gear.
In step 512, judge whether the output current value of fourth stage collector-shoe gear is equal to zero.
In step 513, in the case of the output current value of the fourth stage collector-shoe gear is null, Judge the output open circuit of the fourth stage collector-shoe gear.
For example, in the case of the output open circuit for judging the fourth stage collector-shoe gear, can terminate current Detection, after fixing a breakdown, re-starts fault detect.
In the step 514, the output current value in the fourth stage collector-shoe gear is not equal in the case of zero, In the third level collector-shoe gear accessed from the fourth stage collector-shoe gear, any one third level is selected to conflux dress Put.
In step 515, judge selected any one third level collector-shoe gear output current value whether Equal to zero.
In step 516, in the null feelings of output current value of any one third level collector-shoe gear Under condition, the output open circuit or the input of fourth stage collector-shoe gear of any one third level collector-shoe gear are judged Branch circuit break.
For example, judging the output open circuit of any one third level collector-shoe gear or fourth stage collector-shoe gear Input branch circuit break in the case of, current detection can be terminated, after fixing a breakdown, re-start Fault detect.
In step 517, zero is not equal in the output current value of any one third level collector-shoe gear In the case of, in the second level collector-shoe gear accessed from described any one third level collector-shoe gear, select any Individual second level collector-shoe gear.
In step 518, judge selected any one second level collector-shoe gear output current value whether Equal to zero.
In step 519, in the null feelings of output current value of any one second level collector-shoe gear Under condition, judge any one second level collector-shoe gear output open circuit or for access it is described any one the Two grades of input branch circuit breaks of collector-shoe gear.
For example, in the output open circuit of judgement any one second level collector-shoe gear or for accessing described appointing In the case of one input branch circuit break of second level collector-shoe gear, current detection can be terminated, excluded After failure, fault detect is re-started.
In step 520, the output current value in any one second level collector-shoe gear is not equal to zero In the case of, judge the output of each first order collector-shoe gear that described any one second level collector-shoe gear is accessed Whether current value is equal to zero.
In step 521, in the case of the output current value of certain first order collector-shoe gear is null, Judge the output open circuit of the first order collector-shoe gear or the input branch for accessing the first order collector-shoe gear Road open circuit.
In step 522, for any second level collector-shoe gear, it is being linked into described any second In the output current value of each first order collector-shoe gear of level collector-shoe gear, output current is found out maximum Value.
In step 530, zero first order collector-shoe gear is not equal to for each output current value, one by one Calculate the difference of the output current maximum and the output current value of targeted first order collector-shoe gear.
In step 540, it is more than or equal to institute with the ratio of the output current maximum in the difference For first order collector-shoe gear input branch road number inverse in the case of, judge targeted first Level collector-shoe gear has input branch circuit break.
For example, in the case where judging that targeted first order collector-shoe gear has input branch circuit break, can be with Terminate current detection, after fixing a breakdown, re-start fault detect.
In step 541, if the second level collector-shoe gear that described any one third level collector-shoe gear is accessed In, whether the null second level collector-shoe gear of output current value is not judged also, it is not judged to from described Any one second level is reselected in the whether null second level collector-shoe gear of disconnected output current value to conflux Device, backs within step 518, so as to any one second level collector-shoe gear for judging to reselect Whether output current value is equal to zero.
In step 542, the dress if second level that described any one third level collector-shoe gear is accessed is confluxed In putting, in the absence of whether the null second level collector-shoe gear of output current value is not judged, never it is judged to Any one third level is reselected in the whether null third level collector-shoe gear of disconnected output current value to conflux Device, backs within step 515, so as to any one third level collector-shoe gear for judging to reselect Whether output current value is equal to zero.
In step 543, converged if there is no whether the null third level of output current value is not judged Stream device, current detection terminates.
For example, after current detection terminates, step can be jumped to according to measurement period setting time 510, beginning is detected next time.
In the present embodiment, due to judge first order collector-shoe gear whether have input branch circuit break before, First step by step to fourth stage collector-shoe gear, third level collector-shoe gear, second level collector-shoe gear output current value Whether judged equal to zero, so that the null letter of output current value according to wherein certain collector-shoe gear Single judge, quick detection goes out fourth stage collector-shoe gear, third level collector-shoe gear, second level collector-shoe gear Trouble location, improves detection efficiency.
In order that the present embodiment more easily understands, current value is added up to reference to a kind of sub-clustering, packet Mode is illustrated to the embodiment of the present invention.
For example, the electric current for accessing same second level collector-shoe gear can be divided into one group, it is same by accessing The electric current of one third level collector-shoe gear is divided into cluster.Sub-clustering, the total electric current of packet, a combination are counted out Electric current be an output current for second level collector-shoe gear, cluster adds up to the electric current for be one The output current of three-level collector-shoe gear.Each cluster adds up to the defeated of the electric current summation for as fourth season collector-shoe gear Go out electric current.It is thus possible to count fourth stage collector-shoe gear, each third level collector-shoe gear, each Two grades of collector-shoe gears, output current values of each first order collector-shoe gear.
In this embodiment, can first determine whether that each cluster adds up to whether the current value summation for is equal to zero.
If current value summation is equal to zero, the output open circuit of fourth stage collector-shoe gear is can be determined that.
If current value summation is not equal to zero, the total current value of the 1st cluster can be first selected to be judged, Judge whether the total current value of the 1st cluster is equal to zero.
If the total current value of the 1st cluster is equal to zero, can be determined that the third level collector-shoe gear of the 1st cluster is defeated Go out input branch circuit break in the 1st tunnel in open circuit or fourth stage collector-shoe gear.
If the total current value of the 1st cluster is not equal to zero, the 1st cluster the 1st can be first selected to combine meter electric current Value is judged, judges that the 1st cluster the 1st is combined and count whether current value is equal to zero.
If the combination meter current value of the 1st cluster the 1st is equal to zero, the second of the 1st group of the 1st cluster is can be determined that Input branch circuit break in 1st tunnel in level collector-shoe gear output open circuit or third level collector-shoe gear.
If the combination meter current value of the 1st cluster the 1st is not equal to zero, the 1st group of the 1st road electric current of the 1st cluster is judged Whether value value is equal to zero.
If the 1st the 1st road current value of the 1st group of cluster is equal to zero, the 1st cluster is can be determined that the 1st group the 1st The first order collector-shoe gear output open circuit on road or the input branch circuit break of second level collector-shoe gear.
If the 1st the 1st road current value of the 1st group of cluster is not equal to zero, the 1st cluster the 1st can be first found out The maximum of Zu Ge roads electric current, calculates the maximum and the 1st group of difference of the 1st road current value of the 1st cluster, The ratio of the difference and the maximum is calculated, judges the ratio whether more than or equal to first order collector-shoe gear The inverse of the number of the input branch road for being accessed.If it is, can be determined that the 1st group of the 1st tunnel of the 1st cluster The first collector-shoe gear have input branch circuit break.
If the 1st the 1st group of cluster also have under first order collector-shoe gear all the way, repeat following first Level detecting step, judges until the 1st group of all first order collector-shoe gears of the 1st cluster complete open circuit.First Level detecting step includes：Judge whether current value is equal to zero all the way under the 1st group of the 1st cluster, if equal to Zero, then judge the output open circuit or the input of second level collector-shoe gear of the first order collector-shoe gear under this all the way Open circuit.If being not equal to zero, the maximum that calculating finds out with this under current value all the way difference, calculate Difference and the ratio of the maximum, judge whether the ratio is accessed more than or equal to first order collector-shoe gear Input branch road number inverse.If it is, the first order collector-shoe gear under can be determined that this all the way There is input branch circuit break.
After the 1st group of the detection of the 1st cluster terminates, the collector-shoe gear of other groups of the 1st cluster can be turned to, followed Ring detection mode of the 1st group of the 1st cluster more than is detected, until confluxing for the 1st all each groups of cluster Device is all detected and terminated.
After the collector-shoe gear of the 1st all each groups of cluster is all detected and terminated, the dress that confluxes of other clusters can be turned to Put, circulation detection mode of the 1st cluster more than is detected, until the collector-shoe gear of each cluster is all detected Terminate.
Wherein, by taking the detection on the Zux roads of the 1st cluster the 1st as an example, can be detected using real-time current, Can also be detected using integrating electric value in measurement period.Sample frequency in the measurement period can With less than 30 seconds.Measurement period can select day or week.In measurement period, the 1st can be added up The Zux roads integrating electric value of cluster the 1st.If the Zux roads real-time current value of the 1st cluster the 1st or statistics week Integrating electric value is equal to zero, the output open circuit of the first order collector-shoe gear on the Zux roads of the 1st cluster the 1st in phase Or the input open circuit of second level collector-shoe gear.If the Zux roads real-time current value of the 1st cluster the 1st or statistics week Integrating electric value is not equal to zero in phase, judges whetherImaxIt is the 1st Zu Ge roads real-time current Maximum in value or measurement period in integrating electric value, I is xth road real-time current value or measurement period Interior integrating electric value, n is the input number of branches on xth road.If it is determined that1st cluster Branch road is input into the first order collector-shoe gear on 1 Zux roads open circuit, and breaking quantity isIf It is determined thatBranch road is input into the first order collector-shoe gear on the Zux roads of the 1st cluster the 1st without open circuit.
Fig. 6 is the frame of the photovoltaic generation input circuit failure detector according to an exemplary embodiment Figure.The photovoltaic generation input circuit that the device is related to is using classification bus structure.Wherein, the classification converges The collector-shoe gear for being used to access photovoltaic module output current in flow structure is first order collector-shoe gear, for connecing The collector-shoe gear for entering the output current of the first order collector-shoe gear is second level collector-shoe gear, same second Level collector-shoe gear access each first order collector-shoe gear be respectively connected to input branch road number it is identical and Photovoltaic module design parameter is identical.The device can be configured at various intelligent terminals or server, for example, Computer or work station.For example, the computer 101 that can be configured at shown in Fig. 1.As shown in fig. 6, The device can include：Acquisition module 610, maximum searching modul 620, difference calculating module 630, Fault determination module 640.
The acquisition module 610, can be configured to be arranged on the first order collector-shoe gear output end Current detection circuit gather the output current value of the first order collector-shoe gear.
The maximum searching modul 620, can be configured as in each of any second level collector-shoe gear access In the output current value of individual first order collector-shoe gear, output current maximum is found out.
The difference calculating module 630, can be configured as calculating the output current maximum with described The difference of the output current value of any first order collector-shoe gear that one second level collector-shoe gear is accessed.
The fault determination module 640, can be configured as in the difference and the output current maximum Number of the ratio more than or equal to the input branch road that any first order collector-shoe gear is accessed inverse In the case of, judge that any first order collector-shoe gear has input branch circuit break.
It can be seen that, the present invention gathers the by setting current detection circuit in first order collector-shoe gear output end The output current value of one-level collector-shoe gear, you can the first order for being tested with input branch circuit break is confluxed dress Put, it is achieved thereby that finding the mesh of photovoltaic generation input circuit trouble location by less detection circuit 's.
Fig. 7 is the photovoltaic generation input circuit failure detector according to another exemplary embodiment Block diagram.As shown in fig. 7, the device can also include：Statistical module 611, can be configured as basis The output current value and the classification bus structure of the first order collector-shoe gear for collecting, count The output current value of any collector-shoe gear, measurement period can select day or week.Electric current judge module 612, can be configured as judging whether the output current value of any collector-shoe gear is equal to zero.Wherein, The fault determination module 640 can be additionally configured to the output current value etc. in any collector-shoe gear In the case of zero, the output open circuit of any collector-shoe gear is judged or for accessing described any conflux The input branch circuit break of the one-level collector-shoe gear high of the output current of device.
In the present embodiment, due to judge first order collector-shoe gear whether have input branch circuit break before, Whether the null simple judgement of output current value to collector-shoe gear is first passed through, detects that collector-shoe gear is It is no to have the input branch circuit break for exporting one-level collector-shoe gear breaking or high, it is out of order such that it is able to detect as early as possible Position, improves detection efficiency.
In a kind of possible implementation method, the electric current judge module 612 can be configured as according to described Classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, judges each dress that confluxes step by step Whether the output current value put is equal to zero.
In a kind of possible implementation method, as shown in fig. 7, described device can also include：Cycle is set Module 613, is configured as setting measurement period.The acquisition module 610 can be configured as at each In measurement period, gathered simultaneously by the current detection circuit for being arranged on the first order collector-shoe gear output end Add up output current value of the first order collector-shoe gear in each measurement period, obtain the first order Accumulative output current value of the collector-shoe gear in each measurement period.The statistical module 611 can be matched somebody with somebody The accumulative output current value being set to according to the first order collector-shoe gear in each measurement period and institute Classification bus structure is stated, accumulative output current of each collector-shoe gear in each measurement period is counted Value.The electric current judge module 612 is configured as, according to the classification bus structure, confluxing from the superlative degree Device judges that each collector-shoe gear is accumulative defeated in each measurement period step by step to first order collector-shoe gear Go out whether current value is equal to zero.
In a kind of possible implementation method, the acquisition module 610 can be configured to be arranged on institute The current detection circuit for stating first order collector-shoe gear output end gathers the first order collector-shoe gear current The real-time output current value of detection moment, obtains reality of the first order collector-shoe gear at the current detection moment When output current value.The statistical module 611 can be configured as being existed according to the first order collector-shoe gear The real-time output current value at current detection moment and the classification bus structure, count each dress that confluxes Put the real-time output current value at the current detection moment.The electric current judge module 612 can be configured as According to the classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, judge step by step every Whether real-time output current value of the individual collector-shoe gear at the current detection moment is equal to zero.
In a kind of possible implementation method, the level for being classified collector-shoe gear in bus structure is from high in the end Order be：Fourth stage collector-shoe gear, third level collector-shoe gear, second level collector-shoe gear, the first order are converged Stream device.The electric current judge module 612 can include：Level Four electric current judging submodule 612a, three-level Selection submodule 612b, tertiary current judging submodule 612c, two grades of selection submodule 612d, two grades Electric current judging submodule 612e, one-level electric current judging submodule 612f, two grades of gravity treatment submodule 612g, Three-level gravity treatment submodule 612h.
Level Four electric current judging submodule 612a, can be configured as judging the output of fourth stage collector-shoe gear Whether current value is equal to zero.
The three-level selects submodule 612b, can be configured as the output electricity in the fourth stage collector-shoe gear Flow valuve is not equal in the case of zero, in the third level collector-shoe gear accessed from the fourth stage collector-shoe gear, Select any one third level collector-shoe gear.
Tertiary current judging submodule 612c, can be configured as judging selected any one third level Whether the output current value of collector-shoe gear is equal to zero.
This two grades selection submodule 612d, can be configured as in any one third level collector-shoe gear Output current value is not equal in the case of zero, from the second level that described any one third level collector-shoe gear is accessed In collector-shoe gear, any one second level collector-shoe gear is selected.
Two-level current judging submodule 612e, can be configured as judging selected any one second level Whether the output current value of collector-shoe gear is equal to zero.
One-level electric current judging submodule 612f, can be configured as confluxing dress in described any one second level The output current value put is not equal in the case of zero, judges what described any one second level collector-shoe gear was accessed Whether the output current value of each first order collector-shoe gear is equal to zero.
Two grades of gravity treatment submodule 612g, if described any one third level collector-shoe gear can be configured as In the second level collector-shoe gear of access, whether the null second level of output current value is not judged also and is converged Whether stream device, selects again from described not being judged in the null second level collector-shoe gear of output current value Any one second level collector-shoe gear is selected, two-level current judging submodule 612e described in retriggered performs institute State the whether null step of output current value for judging selected any one second level collector-shoe gear.
Three-level gravity treatment submodule 612h, if described any one third level collector-shoe gear can be configured as In the second level collector-shoe gear of access, in the absence of not being judged the whether null second level of output current value Whether collector-shoe gear, is never judged in the null third level collector-shoe gear of output current value and reselects Any one third level collector-shoe gear, tertiary current judging submodule 612c described in retriggered performs described Judge the whether null step of output current value of selected any one third level collector-shoe gear.
Wherein, the difference calculating module 630 can be configured as in the maximum searching modul 620 Find out the output electricity in each first order collector-shoe gear that described any one second level collector-shoe gear is accessed After stream maximum, zero first order collector-shoe gear is not equal to for each output current value, calculated one by one The difference of the output current maximum and the output current value of targeted first order collector-shoe gear.
The fault determination module 640 can be configured as being not equal to for each output current value the of zero One-level collector-shoe gear, is more than or equal to targeted in the difference and the ratio of the output current maximum First order collector-shoe gear input branch road number inverse in the case of, judge that the targeted first order is converged Stream device has input branch circuit break.
Fig. 8 is the frame of the photovoltaic generation input circuit fault detection system according to an exemplary embodiment Figure.As shown in figure 8, the system can include：Photovoltaic generation input circuit 810, current detection circuit 820th, data processing equipment 830.
Wherein, the photovoltaic generation input circuit 810 uses classification bus structure, wherein, the classification The collector-shoe gear for being used to access photovoltaic module output current in bus structure is first order collector-shoe gear, is used for The collector-shoe gear of output current of the first order collector-shoe gear is accessed for second level collector-shoe gear, same the The number of the input branch road that each first order collector-shoe gear that two grades of collector-shoe gears are accessed is respectively connected to is identical, And photovoltaic module design parameter is identical.
Wherein, current detection circuit 820 is arranged on the first order collector-shoe gear output end.
Wherein, the photovoltaic generation that data processing equipment 830 is applied as described in any embodiment of the present invention is defeated Enter fault detection method.
It can be seen that, the present invention gathers the by setting current detection circuit in first order collector-shoe gear output end The output current value of one-level collector-shoe gear, you can input branch circuit break is tested with by data processing equipment First order collector-shoe gear, it is achieved thereby that finding photovoltaic generation input circuit by less detection circuit The purpose of trouble location.
In a kind of possible implementation method, as shown in figure 8, the system can also include：Data acquisition Device 840, can be configured as being collected the output current value that each current detection circuit is collected, Output current value after collecting is transferred to the data processing equipment.
It should be noted that data acquisition unit 840 described in the embodiment of the present invention is in fig. 8 with dotted lines, To represent that the equipment is not the necessaries of system provided in an embodiment of the present invention.
As seen through the above description of the embodiments, those skilled in the art can be understood that The present invention can add the mode of required general hardware platform to realize by software.Based on such understanding, The part that technical scheme substantially contributes to prior art in other words can be produced with software The form of product is embodied, and the computer software product can be stored in storage medium, such as ROM/RAM, magnetic disc, CD etc., including some instructions are used to so that computer equipment (can be with It is personal computer, server, or network equipment etc.) perform each embodiment of the application or implementation Method described in some parts of example.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention is not limited Detail in above-mentioned implementation method, in range of the technology design of the invention, can be to the present invention Technical scheme carry out various simple variants, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique described in above-mentioned specific embodiment is special Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not The repetition wanted, the present invention is no longer separately illustrated to various possible combinations.
Additionally, can also be combined between a variety of implementation methods of the invention, as long as it is without prejudice to this hair Bright thought, it should equally be considered as content disclosed in this invention.

Claims (17)

1. a kind of photovoltaic generation input circuit fault detection method, it is characterised in that the photovoltaic generation Input circuit uses classification bus structure, wherein, for accessing photovoltaic module in the classification bus structure The collector-shoe gear of output current is first order collector-shoe gear, for accessing the defeated of the first order collector-shoe gear Go out the collector-shoe gear of electric current for second level collector-shoe gear, same second level collector-shoe gear access each first The number of the input branch road that level collector-shoe gear is respectively connected to is identical and photovoltaic module design parameter is identical, institute The method of stating includes：
Described first is gathered by the current detection circuit for being arranged on the first order collector-shoe gear output end The output current value of level collector-shoe gear；
In the output current of each first order collector-shoe gear that any second level collector-shoe gear is accessed, search Go out output current maximum；
Calculate the output current maximum is accessed with any second level collector-shoe gear any first The difference of the output current value of level collector-shoe gear；
It is more than or equal to any first order with the ratio of the output current maximum in the difference In the case of the inverse of the number of the input branch road that collector-shoe gear is accessed, judge that any first order is confluxed Device has input branch circuit break.
2. method according to claim 1, it is characterised in that methods described also includes：
Output current value and the classification according to the first order collector-shoe gear for collecting conflux knot Structure, counts the output current value of any collector-shoe gear；
Judge whether the output current value of any collector-shoe gear is equal to zero；
In the case of the output current value of any collector-shoe gear is null, described any conflux is judged The output open circuit of device is confluxed dress for accessing the one-level high of the output current of any collector-shoe gear The input branch circuit break put.
3. method according to claim 2, it is characterised in that any collector-shoe gear of judgement Output current value whether include equal to zero：
According to the classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, sentence step by step Whether the output current value of disconnected each collector-shoe gear is equal to zero.
4. method according to claim 3, it is characterised in that methods described also includes：Set Measurement period；
The current detection circuit by being arranged on the first order collector-shoe gear output end gathers described The output current value of first order collector-shoe gear includes：
In each measurement period, by the current detecting for being arranged on the first order collector-shoe gear output end Circuit is gathered and adds up output current value of the first order collector-shoe gear in each measurement period, is obtained Accumulative output current value of the first order collector-shoe gear in each measurement period；
The output current value of the first order collector-shoe gear that described basis is collected and the classification Bus structure, the output current value for counting any collector-shoe gear includes：
The accumulative output current value in each measurement period and institute according to the first order collector-shoe gear Classification bus structure is stated, accumulative output current of each collector-shoe gear in each measurement period is counted Value；
It is described according to the classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, by Level judges whether the output current value of each collector-shoe gear includes equal to zero：
According to the classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, sentence step by step Whether accumulative output current value of each collector-shoe gear in each measurement period that break is equal to zero.
5. method according to claim 4, it is characterised in that the sampling in the measurement period Frequency is less than 30 seconds.
6. method according to claim 3, it is characterised in that described by being arranged on described The current detection circuit of one-level collector-shoe gear output end gathers the output current of the first order collector-shoe gear Value includes：
Described first is gathered by the current detection circuit for being arranged on the first order collector-shoe gear output end Real-time output current value of the level collector-shoe gear at the current detection moment, obtains the first order collector-shoe gear and exists The real-time output current value at current detection moment；
The output current value of the first order collector-shoe gear that the basis is collected and the classification converge Flow structure, the output current value for counting any collector-shoe gear includes：
According to the first order collector-shoe gear in the real-time output current value at current detection moment and described Classification bus structure, counts real-time output current value of each collector-shoe gear at the current detection moment；
It is described according to the classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, by Level judges whether the output current value of each collector-shoe gear includes equal to zero：
According to the classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, sentence step by step Whether real-time output current value of each collector-shoe gear at the current detection moment that break is equal to zero.
7. method according to claim 3, it is characterised in that converged in the classification bus structure The level order from high in the end for flowing device is：Fourth stage collector-shoe gear, third level collector-shoe gear, second Level collector-shoe gear, first order collector-shoe gear；
It is described according to the classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, by Level judges whether the output current value of each collector-shoe gear includes equal to zero：
Judge whether the output current value of fourth stage collector-shoe gear is equal to zero；
It is not equal in the case of zero in the output current value of the fourth stage collector-shoe gear, from the fourth stage In the third level collector-shoe gear that collector-shoe gear is accessed, any one third level collector-shoe gear is selected；
Judge whether the output current value of selected any one third level collector-shoe gear is equal to zero；
It is not equal in the case of zero in the output current value of any one third level collector-shoe gear, from described In the second level collector-shoe gear that any one third level collector-shoe gear is accessed, any one second level is selected to conflux dress Put；
Judge whether the output current value of selected any one second level collector-shoe gear is equal to zero；
It is not equal in the case of zero in the output current value of any one second level collector-shoe gear, judges institute State each first order collector-shoe gear that any one second level collector-shoe gear is accessed output current value whether etc. In zero；
If in the second level collector-shoe gear that described any one third level collector-shoe gear is accessed, be not judged to also The whether null second level collector-shoe gear of disconnected output current value, be from the output current value that is not judged Any one second level collector-shoe gear is reselected in no null second level collector-shoe gear, is backed within The whether null step of the output current value for judging selected any one second level collector-shoe gear；
If in the second level collector-shoe gear that described any one third level collector-shoe gear is accessed, in the absence of not by Judge the whether null second level collector-shoe gear of output current value, never whether be judged output current value Any one third level collector-shoe gear is reselected in null third level collector-shoe gear, institute is backed within State the whether null step of output current value for judging selected any one third level collector-shoe gear；
Wherein, it is described to calculate the output current maximum with any second level collector-shoe gear access The difference of the output current value of any first order collector-shoe gear includes：
In each first order collector-shoe gear that described any one second level collector-shoe gear is accessed is found out After output current maximum, zero first order collector-shoe gear is not equal to for each output current value, by The individual difference for calculating the output current maximum and the output current value of targeted first order collector-shoe gear Value；
The ratio in the difference and the output current maximum is more than or equal to described any the In the case of the inverse of the number of the input branch road that one-level collector-shoe gear is accessed, any first order is judged Collector-shoe gear have input branch circuit break include：
It is not equal to zero first order collector-shoe gear for each output current value, it is defeated with described in the difference The ratio for going out current maxima is input into the number of branch road more than or equal to targeted first order collector-shoe gear Inverse in the case of, judge that targeted first order collector-shoe gear has input branch circuit break.
8. method according to claim 1, it is characterised in that the first order collector-shoe gear connects The number of the input branch road for entering is less than or equal to 16 tunnels；
The number of the input branch road that the second level collector-shoe gear is accessed is more than or equal to 3 tunnels；
The level of the classification bus structure is less than or equal to 4 grades.
9. method according to claim 1, it is characterised in that the photovoltaic module design parameter Including：The model of the photovoltaic module, capacity, number, connected mode, output voltage, electric current index, Fuse types, cable model and length.
10. a kind of photovoltaic generation input circuit failure detector, it is characterised in that the photovoltaic generation Input circuit uses classification bus structure, wherein, for accessing photovoltaic module in the classification bus structure The collector-shoe gear of output current is first order collector-shoe gear, for accessing the defeated of the first order collector-shoe gear Go out the collector-shoe gear of electric current for second level collector-shoe gear, same second level collector-shoe gear access each first The number of the input branch road that level collector-shoe gear is respectively connected to is identical and photovoltaic module design parameter is identical, institute Stating device includes：
Acquisition module, is configured to be arranged on the current detecting of the first order collector-shoe gear output end Circuit gathers the output current value of the first order collector-shoe gear；
Maximum searching modul, each first order for being configured as being accessed in any second level collector-shoe gear is converged Flow in the output current value of device, find out output current maximum；
Difference calculating module, is configured as calculating the output current maximum with any second level remittance The difference of the output current value of any first order collector-shoe gear that stream device is accessed；
Fault determination module, is configured as being more than with the ratio of the output current maximum in the difference Or in the case of the inverse of the number of the input branch road accessed equal to any first order collector-shoe gear, sentence Fixed any first order collector-shoe gear has input branch circuit break.
11. devices according to claim 10, it is characterised in that described device also includes：
Statistical module, be configured as according to the output current value of the first order collector-shoe gear for collecting with And the classification bus structure, count the output current value of any collector-shoe gear；
Electric current judge module, is configured as judging whether the output current value of any collector-shoe gear is equal to Zero；
Wherein, the fault determination module is additionally configured to the output current value in any collector-shoe gear In the case of null, the output open circuit of any collector-shoe gear is judged or for accessing any remittance Flow the input branch circuit break of the one-level collector-shoe gear high of the output current of device.
12. devices according to claim 11, it is characterised in that the electric current judge module quilt It is configured to according to the classification bus structure, from highest collector-shoe gear to first order collector-shoe gear, step by step Judge whether the output current value of each collector-shoe gear is equal to zero.
13. devices according to claim 12, it is characterised in that described device also includes：Week Phase setup module, is configured as setting measurement period；
The acquisition module is configured as in each measurement period, is confluxed by being arranged on the first order The current detection circuit of device output end is gathered and adds up the first order collector-shoe gear in each statistics week Output current value in phase, obtains accumulative output of the first order collector-shoe gear in each measurement period Current value；
The statistical module is configured as according to the first order collector-shoe gear in each measurement period Accumulative output current value and the classification bus structure, count each collector-shoe gear in each statistics week Accumulative output current value in phase；
The electric current judge module is configured as according to the classification bus structure, from highest collector-shoe gear To first order collector-shoe gear, accumulative output electricity of each collector-shoe gear in each measurement period is judged step by step Whether flow valuve is equal to zero.
14. devices according to claim 12, it is characterised in that the acquisition module is configured It is to gather the first order by being arranged on the current detection circuit of the first order collector-shoe gear output end Collector-shoe gear obtains the first order collector-shoe gear and is working as in the real-time output current value at current detection moment The real-time output current value of preceding detection moment；
The statistical module is configured as the reality at the current detection moment according to the first order collector-shoe gear When the output current value and classification bus structure, count each collector-shoe gear at the current detection moment Real-time output current value；
The electric current judge module is configured as according to the classification bus structure, from highest collector-shoe gear To first order collector-shoe gear, real-time output current of each collector-shoe gear at the current detection moment is judged step by step Whether value is equal to zero.
15. devices according to claim 12, it is characterised in that in the classification bus structure The level of collector-shoe gear order from high in the end is：Fourth stage collector-shoe gear, third level collector-shoe gear, Two grades of collector-shoe gears, first order collector-shoe gears；
The electric current judge module includes：
Level Four electric current judging submodule, be configured as judging fourth stage collector-shoe gear output current value whether Equal to zero；
Three-level selects submodule, is configured as being not equal in the output current value of the fourth stage collector-shoe gear In the case of zero, in the third level collector-shoe gear accessed from the fourth stage collector-shoe gear, any one is selected Third level collector-shoe gear；
Tertiary current judging submodule, is configured as judging selected any one third level collector-shoe gear Whether output current value is equal to zero；
Two grades of selection submodules, are configured as the output current value in any one third level collector-shoe gear It is not equal in the case of zero, from the second level collector-shoe gear that described any one third level collector-shoe gear is accessed In, select any one second level collector-shoe gear；
Two-level current judging submodule, is configured as judging selected any one second level collector-shoe gear Whether output current value is equal to zero；
One-level electric current judging submodule, is configured as the output electricity in any one second level collector-shoe gear Flow valuve is not equal in the case of zero, judges each first order that described any one second level collector-shoe gear is accessed Whether the output current value of collector-shoe gear is equal to zero；
Two grades of gravity treatment submodules, if being configured as described any one third level collector-shoe gear is accessed second In level collector-shoe gear, whether the null second level collector-shoe gear of output current value is not judged also, from Whether described not being judged in the null second level collector-shoe gear of output current value reselects any one Second level collector-shoe gear, it is selected that two-level current judging submodule described in retriggered performs the judgement The whether null step of the output current value of any one second level collector-shoe gear；
Three-level gravity treatment submodule, if being configured as described any one third level collector-shoe gear is accessed second In level collector-shoe gear, in the absence of not being judged the whether null second level collector-shoe gear of output current value, Never be judged in the whether null third level collector-shoe gear of output current value reselect any one Three-level collector-shoe gear, tertiary current judging submodule described in retriggered performs selected of the judgement One whether null step of the output current value of third level collector-shoe gear；
Wherein, the difference calculating module is configured as finding out described appointing in the maximum searching modul After output current maximum in one each first order collector-shoe gear of second level collector-shoe gear access, It is not equal to zero first order collector-shoe gear for each output current value, the output current value is calculated one by one The difference of maximum and the output current value of targeted first order collector-shoe gear；
The first order that the fault determination module is configured as being not equal to zero for each output current value is converged Stream device, targeted first is more than or equal in the difference with the ratio of the output current maximum In the case of the inverse of the number of level collector-shoe gear input branch road, targeted first order collector-shoe gear is judged There is input branch circuit break.
A kind of 16. photovoltaic generation input circuit fault detection systems, it is characterised in that including：
Photovoltaic generation input circuit, wherein, the photovoltaic generation input circuit uses classification bus structure, Wherein, the collector-shoe gear for being used to access photovoltaic module output current in the classification bus structure is the first order Collector-shoe gear, the collector-shoe gear of the output current for accessing the first order collector-shoe gear is second level remittance Stream device, the input branch that each first order collector-shoe gear that same second level collector-shoe gear is accessed is respectively connected to The number on road is identical and photovoltaic module design parameter is identical；
It is arranged on the current detection circuit of the first order collector-shoe gear output end；
Using the photovoltaic generation input circuit fault detect as described in claim 1-9 any one claims The data processing equipment of method.
17. systems according to claim 16, it is characterised in that the system also includes：
Data acquisition unit, the output current value for being configured as collecting each current detection circuit is converged Always, the output current value after collecting is transferred to the data processing equipment.
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