CN206164473U - Photovoltaic module error monitoring device - Google Patents
Photovoltaic module error monitoring device Download PDFInfo
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- CN206164473U CN206164473U CN201621017412.7U CN201621017412U CN206164473U CN 206164473 U CN206164473 U CN 206164473U CN 201621017412 U CN201621017412 U CN 201621017412U CN 206164473 U CN206164473 U CN 206164473U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model discloses a photovoltaic module error monitoring device. The device includes: voltage sensor is connected with photovoltaic module, is used for the monitoring photovoltaic module's terminal voltage and basis the terminal voltage is given birth to moulding and is planned voltage signal, the treater, with voltage sensor is connected, is used for the basis analog voltage signal judges whether photovoltaic module the trouble. Through the utility model discloses, the whether problem of trouble of the unable photovoltaic module of judgement has been solved in the correlation technique.
Description
Technical field
The utility model is related to malfunction monitoring field, in particular to a kind of photovoltaic module fault monitoring device.
Background technology
One standard photovoltaic module is generally made up of 60 photovoltaic cells, as shown in figure 1, each photovoltaic cell is suitable
In an independent out-put supply, its IV (current-voltage) characteristic curve is as shown in Figure 2.All 60 cell pieces are together in series
Externally output, output current is about 10～15A, and output voltage is about 30～40V.When one piece of photovoltaic cell breaks down,
The electric current of the cell piece is substantially reduced, and is just occurred such as the situation of ii quadrant in Fig. 2, becomes a very big load of pressure drop,
Up to 30V, big pressure drop can cause cell piece to be brought rapidly up initiation fire for pressure drop.
In prior art, the potential safety hazard brought to prevent cell piece from breaking down, generally in several cell pieces, example
Such as, as shown in fig. 1, a diode in parallel in 20 cell pieces, if any a piece of battery in this 20 cell pieces
Piece failure, diode can be by all short circuits of this 20 cell pieces.This mode avoids to a certain extent hot spot effect, reduces
Failure the tour personnel in power station and cannot find there is component for the loss for generating electricity at the scene or from back-end data
Raw failure, cannot also determine which component there occurs failure, and failure will persistently be present, and not only have impact on the work(of whole photovoltaic group
Rate, offsets from maximum power point, and with breakneck potential safety hazard.
For the photovoltaic module whether problem of failure cannot be judged in correlation technique, effective solution party is not yet proposed at present
Case.
Utility model content
Main purpose of the present utility model is to provide a kind of photovoltaic module fault monitoring device, to solve correlation technique in
The photovoltaic module whether problem of failure cannot be judged.
To achieve these goals, according to one side of the present utility model, there is provided a kind of photovoltaic module fault detect
Device.The device includes：Voltage sensor, is connected with photovoltaic module, for monitoring the terminal voltage of photovoltaic module and according to end
Voltage generates analog voltage signal；Processor, is connected with voltage sensor, for judging photovoltaic group according to analog voltage signal
Part whether failure.
Further, the device also includes：Data transmission module, is connected with voltage sensor and processor, for inciting somebody to action
Analog voltage signal is transmitted to processor.
Further, voltage sensor includes：Reducing transformer, is connected with photovoltaic module, for being depressured to terminal voltage,
Obtain first voltage；Stepping circuit, is connected with reducing transformer and processor, for the electricity residing for the magnitude of voltage according to first voltage
Pressure value scope determines the gear of first voltage.
Further, stepping circuit includes：Multiple gear loops, wherein, each gear loop with reducing transformer and process
Device is connected.
Further, multiple gear loops include target gear loop, and target gear is in series with light emitting diode in loop
Or light emitting transistor.
Further, stepping circuit includes：First resistor, first end is connected with the positive output end of reducing transformer；One or two
Pole pipe, negative pole is connected with the second end of first resistor, and positive pole is connected with the negative output terminal of reducing transformer；Second diode, just
Pole is connected with the first end of first resistor；Second resistance, first end is connected with the negative pole of the second diode；3rd resistor,
First end is connected with the negative pole of the second diode；4th resistance, first end is connected with the second end of second resistance；One or three
Pole pipe, base stage is connected with the second end of second resistance, and colelctor electrode is connected with the second end of 3rd resistor；5th resistance, the
One end is connected with the emitter stage of the first triode, and the second end is connected with the second end of the 4th resistance.
Further, stepping circuit also includes：3rd diode, positive pole is connected with the colelctor electrode of the first triode；The
Six resistance, first end is connected with the negative pole of the second diode；Second triode, base stage is connected with the negative pole of the 3rd diode
Connect, colelctor electrode is connected with the second end of the 6th resistance；7th resistance, first end is connected with the emitter stage of the second triode,
Second end is connected with the second end of the 4th resistance.
Further, stepping circuit also includes：First luminous tube, negative pole is connected with the second end of first resistor, positive pole
It is connected with the negative pole of the first diode；Second luminous tube, positive pole is connected with the emitter stage of the second triode, negative pole and the 7th
The first end of resistance is connected.
Further, voltage sensor also includes：Filter circuit, is connected between reducing transformer and stepping circuit, for right
First voltage is filtered.
Further, filter circuit includes：8th resistance, is connected between the positive output end of reducing transformer and stepping circuit；
Electric capacity, with stepping circuit in parallel.
The utility model passes through the terminal voltage of monitoring photovoltaic module and generates analog voltage signal according to terminal voltage；According to mould
Intend voltage signal and judge photovoltaic module whether failure, solving cannot judge photovoltaic module failure is asked in correlation technique
Topic, and then reached the monitor photovoltaic module whether effect of failure.
Description of the drawings
The accompanying drawing for constituting the part of the application is used for providing further understanding to of the present utility model, of the present utility model
Schematic description and description is used to explain the utility model, does not constitute to improper restriction of the present utility model.In accompanying drawing
In：
Fig. 1 is a kind of schematic diagram of the standard photovoltaic module according to prior art；
Fig. 2 is the characteristic schematic diagrames of IV of photovoltaic cell；
Fig. 3 is the schematic diagram of the photovoltaic module fault monitoring device according to the utility model first embodiment；
Fig. 4 is that the IV of the photovoltaic cell under different illuminance according to the utility model embodiment characteristic shows
It is intended to；
Fig. 5 is that a Battery pack piece is shown by the IV curves of shorted diode in photovoltaic module according to the utility model embodiment
It is intended to；
Fig. 6 is that the IV curves that a piece of cell piece is short-circuited in photovoltaic module according to the utility model embodiment are illustrated
Figure；
Fig. 7 is the schematic diagram of the photovoltaic module fault monitoring device according to the utility model second embodiment；
Fig. 8 is the schematic block diagram of the photovoltaic module fault monitoring device according to the utility model fourth embodiment；
Fig. 9 is the schematic diagram of the analog voltage signal stepping according to the utility model embodiment.
Specific embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Below with reference to the accompanying drawings and in conjunction with the embodiments describing the utility model in detail.
In order that those skilled in the art more fully understand application scheme, below in conjunction with the embodiment of the present application
Accompanying drawing, is clearly and completely described to the technical scheme in the embodiment of the present application, it is clear that described embodiment is only
The embodiment of the application part, rather than the embodiment of whole.Based on the embodiment in the application, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, should all belong to the model of the application protection
Enclose.
It should be noted that the description and claims of this application and the term " first " in above-mentioned accompanying drawing, "
Two " it is etc. the object for distinguishing similar, without for describing specific order or precedence.It should be appreciated that so using
Data can exchange in the appropriate case, so as to embodiments herein described herein.Additionally, term " including " and " tool
Have " and their any deformation, it is intended that cover non-exclusive including.
Embodiment of the present utility model provides a kind of photovoltaic module fault monitoring device.
Fig. 3 is the schematic diagram of the photovoltaic module fault monitoring device according to the utility model first embodiment.Such as Fig. 3 institutes
Show, the device includes voltage sensor 10 and processor 20.
Voltage sensor 10 is connected with photovoltaic module, can monitor the terminal voltage of photovoltaic module and be generated according to terminal voltage
Analog voltage signal；Processor 20 is connected with voltage sensor 10, can judge that photovoltaic module is according to analog voltage signal
No failure.
Under low lighting conditions short circuit current is greatly reduced normal photovoltaic cell, but open-circuit voltage reduces amplitude less,
By " flattening ", as shown in figure 4, I is electric current, U is voltage to whole IV curves, and the illuminance in figure refers to intensity of illumination, unit
1000W/m2.Therefore under unfaulty conditions, the operating voltage of photovoltaic module, or open circuit voltage variations of inverter when not starting
Amplitude is little.Therefore, if terminal voltage reduces certain amplitude, may determine that photovoltaic module failure.
A usual diode in parallel in several cell pieces in photovoltaic module, if one piece of cell piece failure, this is several
Individual cell piece can be by whole short circuits.When there is cell piece in certain component to be damaged (short circuit) or occur forever to block failure, such as Fig. 5
Shown, the electric current on main line of connecting very likely is more than its short circuit current IS, and Us is open circuit voltage, causes cell piece to become load,
So as to cause the conducting of bypass protection diode, the Battery pack is shorted, and output voltage is plummeted to 0 or so, total output voltage drop
To U1.When a component has least one set cell piece by bypass diode, its output voltage will be significantly lower than other components.When
When certain cell piece inside partial short-circuit failure occurs in component, as shown in fig. 6, IS is short circuit current, Us is open circuit voltage, due to
The parallel resistance of the cell piece is reduced, and causes component fill factor, curve factor to reduce, so as under the current conditions of identical main line, it is exported
Voltage also will be significantly lower than other normal components, and total output voltage is down to U2.
Therefore, if the cell piece in photovoltaic module breaks down, the terminal voltage of photovoltaic module can be reduced, can basis
Analog voltage signal judges whether photovoltaic module breaks down.
The device can also include data transmission module, and data transmission module is connected with voltage sensor and processor,
For analog voltage signal to be transmitted to processor.
Voltage sensor can include：Reducing transformer, is connected with photovoltaic module, for being depressured to terminal voltage, obtains
First voltage；Stepping circuit, is connected with reducing transformer and processor, for the magnitude of voltage residing for the magnitude of voltage according to first voltage
Scope determines the gear of first voltage, wherein, processor is used to judge photovoltaic module whether failure according to gear.
Stepping circuit can include：Multiple gear loops, wherein, each gear loop is connected with reducing transformer and processor
Connect, each gear loop is used to be turned on when the magnitude of voltage of first voltage is in itself corresponding preset voltage value scope, and the
The magnitude of voltage of one voltage does not end in itself corresponding preset voltage value scope, each corresponding preset voltage value in gear loop
Scope is not overlapped mutually.
If multiple gear loops include target gear loop, light emitting diode or luminous three are in series with target gear loop
Pole pipe, for turning on and lighting when the magnitude of voltage of first voltage is in the corresponding preset voltage value scope in target gear loop.
Preferably, when gear is third gear, the physical circuit connected mode of stepping circuit can be：First resistor, first
End is connected with the positive output end of reducing transformer；First diode, negative pole is connected with the second end of first resistor, positive pole with step-down
The negative output terminal of device is connected；Second diode, positive pole is connected with the first end of first resistor；Second resistance, first end with
The negative pole of the second diode is connected；3rd resistor, first end is connected with the negative pole of the second diode；4th resistance, first
End is connected with the second end of second resistance；First triode, base stage is connected with the second end of second resistance, colelctor electrode and
Second end of three resistance is connected；5th resistance, first end is connected with the emitter stage of the first triode, and the second end is electric with the 4th
Second end of resistance is connected.
Preferably, when the gear of stepping circuit is third gear, the physical circuit connection of stepping circuit can also include：Three or two
Pole pipe, positive pole is connected with the colelctor electrode of the first triode；6th resistance, first end is connected with the negative pole of the second diode；
Second triode, base stage is connected with the negative pole of the 3rd diode, and colelctor electrode is connected with the second end of the 6th resistance；7th is electric
Resistance, first end is connected with the emitter stage of the second triode, and the second end is connected with the second end of the 4th resistance.
When the gear of stepping circuit is third gear, the physical circuit connection of stepping circuit can also include：First luminous tube, bears
Pole is connected with the second end of first resistor, and positive pole is connected with the negative pole of the first diode；Second luminous tube, positive pole and second
The emitter stage of triode is connected, and negative pole is connected with the first end of the 7th resistance.
In voltage sensor, filter circuit can also be included, filter circuit is connected between reducing transformer and stepping circuit,
Can be used for being filtered first voltage.Filter circuit can adopt general resistance-capacitance filter circuit, specifically, filter
Wave circuit can include：8th resistance, is connected between the positive output end of reducing transformer and stepping circuit；Electric capacity, with stepping circuit
It is in parallel.
Fig. 7 is the schematic diagram of the photovoltaic module fault monitoring device according to the utility model second embodiment.Such as Fig. 7 institutes
Show, analog voltage signal can be divided into three gears by the photovoltaic module fault monitoring device that the embodiment is provided.
The first end of resistance R1 is connected with the positive output end V+ of reducing transformer, and the second end is connected with the first end of electric capacity C1；
Second end of electric capacity C1 is connected with the negative output terminal V- of reducing transformer；The first end of resistance R2 is connected with second end of resistance R1
Connect, the second end is connected with the negative pole of diode D8；The positive pole of diode D8 is connected with the negative pole of diode D4, diode D4
Positive pole be connected with the negative output terminal of reducing transformer；The positive pole of diode D1 is connected with the second end of first resistor, negative pole with
The first end of resistance R3 is connected；Second end of resistance R3 is connected with the first end of resistance R6；Second end of resistance R6 and drop
The negative output terminal of depressor is connected；The first end of resistance R4 is connected with the first end of resistance R3；The base stage of triode Q2 and electricity
Second end of resistance R3 is connected, and colelctor electrode is connected with the ends of resistance R4 second, and emitter stage is connected with resistance R7 first ends；Resistance R7
Two ends are connected with resistance R8 first ends；The ends of resistance R8 second are connected with the ends of resistance R6 second；Diode D5 positive poles are connected to R8
One end；Diode D6 cathode connecting diode D5 negative poles, the second ends of negative pole connection resistance R8；Resistance R5 first ends connect resistance R4
First end；The second ends of diode D2 positive poles connection resistance R4；Diode D3 cathode connecting diode D2 negative poles；Triode Q1 base stages
Connection diode D3 negative poles, the second ends of colelctor electrode connection resistance R5, emitter stage connection diode D7 positive poles；Diode D7 negative poles connect
Connecting resistance R9 first ends, the second end the second ends of connection resistance R6.
Diode D7 and diode D8 can be light emitting diodes.R1 and C1 constitutes low-pass filter circuit, and time constant is
Ms levels, can filter the time constant of the backward voltage of photovoltaic cell instantaneous short-circuit formation.With monitoring output voltage as 30V
As a example by photovoltaic cell component, the cell piece in photovoltaic cell group is divided into three groups, and one diode of per group of parallel connection works as photocell assembly
When working properly, output voltage is 30V, and triode Q2 conductings, Q1 ends, and light emitting diode D7 and D8 do not work；Work as appearance
When one Battery pack piece failure causes a diode reverse conducting or two Battery pack piece failures to cause two diode reverses to turn on,
Photovoltaic cell component output voltage is reduced to 20V or 10V, now designs Q2 cut-offs, and Q1 conductings, light emitting diode D7 work refers to
Show fault, when three Battery pack pieces break down causes the equal reverse-conducting of diode, triode Q1, Q2 is turned off, send out
Optical diode D8 works, indicating circuit failure.Namely, it is possible to use the condition adjudgement photovoltaic cell group of light emitting diode D7, D8
Working condition.
Fig. 8 is the schematic block diagram of the photovoltaic module fault monitoring device according to the utility model fourth embodiment.Such as Fig. 8 institutes
Show that the filtered circuit filtering of voltage of photovoltaic cell group output produces the input voltage of DC-DC module, while producing with reference to electricity
Pressure Vref.DC-DC module performs step-down conversion to the voltage being input into, can be in larger input voltage range, for example, 6V～40V
Under conditions of, export stable 4V voltage Vw.Vw is by electric resistance partial pressure decile or is not divided into some shelves, is eight shown in Fig. 8
Shelves partial pressure, is then input into eight road comparison modules, namely eight road voltage comparators together with Vref, is compared, and obtains eight tunnels high
Low level, gives indicating circuit after being encoded by 8-3 encoders, indicating circuit is indicated voltage status and failure.
Fig. 9 is the schematic diagram of the analog voltage signal stepping according to the utility model embodiment.As shown in figure 9, the enforcement
Analog voltage signal is divided into into 8 grades in example.1st and 2 grade respectively at 0～1/3Um and 1/3Um～2/3Um, wherein, Um is light
In the output voltage of rated power operation, remaining 6 grades carry out decile to volt component in the range of 2/3Um～Um.1 and 2
The bypass diode that shelves have 3 tunnels or 2 tunnels in proxy component respectively has been short-circuited protection, and remaining 6 subdivision shelves are for judging
It is that 1 roadside road shorted diode occurs, or due to the power fade that reason occurs such as photovoltaic cell is aging, and may determine that
Go out the degree of decline.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.
Claims (10)
1. a kind of photovoltaic module fault monitoring device, it is characterised in that include：
Voltage sensor, is connected with photovoltaic module, for monitoring the terminal voltage of the photovoltaic module and according to the terminal voltage
Generate analog voltage signal；
Processor, is connected with the voltage sensor, for judging that the photovoltaic module is according to the analog voltage signal
No failure.
2. device according to claim 1, it is characterised in that described device also includes：
Data transmission module, is connected with the voltage sensor and the processor, for the analog voltage signal to be passed
Transport to the processor.
3. device according to claim 1, it is characterised in that the voltage sensor includes：
Reducing transformer, is connected with the photovoltaic module, for being depressured to the terminal voltage, obtains first voltage；
Stepping circuit, is connected with the reducing transformer and the processor, for according to residing for the magnitude of voltage of the first voltage
Range of voltage values determine the gear of the first voltage.
4. device according to claim 3, it is characterised in that the stepping circuit includes：
Multiple gear loops, wherein, each gear loop is connected with the reducing transformer and the processor.
5. device according to claim 4, it is characterised in that the plurality of gear loop includes target gear loop, institute
State in target gear loop and be in series with light emitting diode or light emitting transistor.
6. device according to claim 3, it is characterised in that the stepping circuit includes：
First resistor, first end is connected with the positive output end of the reducing transformer；
First diode, negative pole is connected with the second end of the first resistor, the negative output terminal phase of positive pole and the reducing transformer
Connection；
Second diode, positive pole is connected with the first end of the first resistor；
Second resistance, first end is connected with the negative pole of second diode；
3rd resistor, first end is connected with the negative pole of second diode；
4th resistance, first end is connected with the second end of the second resistance；
First triode, base stage is connected with the second end of the second resistance, the second end of colelctor electrode and the 3rd resistor
It is connected；
5th resistance, first end is connected with the emitter stage of first triode, the second end and the second of the 4th resistance
End is connected.
7. device according to claim 6, it is characterised in that the stepping circuit also includes：
3rd diode, positive pole is connected with the colelctor electrode of first triode；
6th resistance, first end is connected with the negative pole of second diode；
Second triode, base stage is connected with the negative pole of the 3rd diode, the second end of colelctor electrode and the 6th resistance
It is connected；
7th resistance, first end is connected with the emitter stage of second triode, the second end and the second of the 4th resistance
End is connected.
8. device according to claim 7, it is characterised in that the stepping circuit also includes：
First luminous tube, negative pole is connected with the second end of the first resistor, the negative pole phase of positive pole and first diode
Connection；
Second luminous tube, positive pole is connected with the emitter stage of second triode, the first end of negative pole and the 7th resistance
It is connected.
9. device according to claim 3, it is characterised in that the voltage sensor also includes：
Filter circuit, is connected between the reducing transformer and the stepping circuit, for being filtered to the first voltage.
10. device according to claim 9, it is characterised in that the filter circuit includes：
8th resistance, is connected between the positive output end of the reducing transformer and the stepping circuit；
Electric capacity, with the stepping circuit in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621017412.7U CN206164473U (en) | 2016-08-30 | 2016-08-30 | Photovoltaic module error monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621017412.7U CN206164473U (en) | 2016-08-30 | 2016-08-30 | Photovoltaic module error monitoring device |
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| Publication Number | Publication Date |
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| CN206164473U true CN206164473U (en) | 2017-05-10 |
Family
ID=58650671
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621017412.7U Active CN206164473U (en) | 2016-08-30 | 2016-08-30 | Photovoltaic module error monitoring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208963A (en) * | 2016-08-30 | 2016-12-07 | 中国华能集团清洁能源技术研究院有限公司 | Photovoltaic module fault monitoring method and device |
| CN108333495A (en) * | 2018-03-01 | 2018-07-27 | 国家电投集团西安太阳能电力有限公司 | A kind of bypass diode working state detecting method of photovoltaic component terminal box |
-
2016
- 2016-08-30 CN CN201621017412.7U patent/CN206164473U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208963A (en) * | 2016-08-30 | 2016-12-07 | 中国华能集团清洁能源技术研究院有限公司 | Photovoltaic module fault monitoring method and device |
| CN108333495A (en) * | 2018-03-01 | 2018-07-27 | 国家电投集团西安太阳能电力有限公司 | A kind of bypass diode working state detecting method of photovoltaic component terminal box |
| CN108333495B (en) * | 2018-03-01 | 2020-11-03 | 国家电投集团西安太阳能电力有限公司 | Method for detecting working state of bypass diode of photovoltaic module junction box |
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