CN106656021B - A kind of anti-PID header boxs system and its implementation - Google Patents
A kind of anti-PID header boxs system and its implementation Download PDFInfo
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- CN106656021B CN106656021B CN201611065592.0A CN201611065592A CN106656021B CN 106656021 B CN106656021 B CN 106656021B CN 201611065592 A CN201611065592 A CN 201611065592A CN 106656021 B CN106656021 B CN 106656021B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of anti-PID header boxs system and its implementation, wherein the anti-PID header boxs system includes：One total header box；Total header box is internally provided with the positive and negative bus-bar and first switch device of the direct current cables for connecting header box output；The positive and negative bus-bar is connected to the input terminal of inverter by positive and negative input port respectively, single-phase alternating current input port connects positive and negative bus-bar by first switch device, positive and negative bus-bar for alternating current to be loaded into total header box by closure first switch device, then exchange is electrically communicated to by each header box by direct current cables.This programme makes alternating current and direct current use existing cable at times, reduces exchange cable and goes into operation, reduces power plant construction cost.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly to a kind of anti-PID header boxs system and its implementation.
Background technology
As shown in Figure 1, current high-power photovoltaic electricity generation system DC side is typically by multiple photovoltaic substrate string formations（Such as figure
It is shown, substrate in batch 1, substrate in batch 2 ... substrate in batch n）Output by cable connection to header box, multiple header boxs pass through cable
It is connected to total header box（Also referred to as DC cabinet）, and total header box is generally positioned near inverter, and power grid is connected by inverter.
When photovoltaic substrate on daytime generates electricity, the electric energy that photovoltaic substrate generates is transmitted to header box by cable, and header box passes through cable again
Electric energy is transmitted to total header box, electric energy is transmitted to inverter by total header box, and inverter is transmitted to power grid after converting electric energy into
On.
To prevent because of PID (potential Induced Degradation, potential induction attenuation) base caused by effect
Plate performance declines, it usually needs uses anti-PID equipment.Usually there are two types of forms at present：Using individual anti-PID equipment or use
PID equipment is integrated with header box, but both modes all have a problem that, anti-PID equipment is typically in night work
Make, photovoltaic substrate does not generate electricity at night, and anti-PID equipment can not take electricity from photovoltaic substrate.For this reason, it may be necessary to be connected for each header box
Exchange cable is for powering.In addition, since confluence box number is more, and arrangement is more dispersed, especially original photovoltaic plant is added
Anti- PID equipment, newly-increased wiring is extremely difficult, while cable of increasing exchanges also increases power station initial outlay and maintenance cost.
In view of this, the prior art could be improved and improve.
Invention content
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of anti-PID header boxs system and
Alternating current, when detecting that photovoltaic substrate does not generate electricity, is loaded by its implementation without cable of increasing exchanges in total header box
On direct current cables, powered for anti-PID equipment by direct current cables.
In order to achieve the above object, this invention takes following technical schemes：
A kind of anti-PID header boxs system, for preventing photovoltaic generating system performance caused by PID effects from declining；Wherein, institute
Stating anti-PID header boxs system includes：One total header box and anti-PID equipment；Total header box is internally provided with for accessing list
The single-phase alternating current input port of phase alternating current, the positive bus of direct current cables for connecting header box output, negative bus,
First switch device, the generating state for detecting photovoltaic module of power supply state for controlling single-phase alternating current, and according to
Generating state controls the detection control module of the conducting state of first switch device；
The positive bus, negative bus pass through the input terminal of the inverter of photovoltaic generating system described in cable connection, institute
State positive bus, negative bus is also connected with detection control module, also by first switch device connect single phase ac electrical input
Mouthful, the detection control module connects first switch device；
When the detection control module detection photovoltaic module does not generate electricity, first switch break-over of device is controlled, single phase ac is made
Input single-phase alternating current in electrical input mouth, and alternating current is loaded on the positive and negative bus-bar of total header box, then pass through direct current
Exchange is electrically communicated to each header box by cable, and is powered for anti-PID equipment by direct current cables；The detection control module detection
When photovoltaic module generates electricity, control first switch device shutdown makes in the DC supply input inverter that photovoltaic module exports.
The anti-PID header boxs system, wherein further include second switch device, the second switch device setting exists
Between positive bus, negative bus and the terminals for connecting inverter cables.
The anti-PID header boxs system, wherein the detection control module includes the power generation for detecting photovoltaic module
The voltage sampling unit of state and for controlling first switch device and second switch device according to the generating state of photovoltaic module
Conducting state control unit；By voltage sampling unit detection direct current, alternating current and the alternating current for being superimposed direct current, and will
Voltage signal is converted to digital signal and exports to control unit, and described control unit is according to voltage sampling unit root testing result control
First switch break-over of device processed, the shutdown of second switch device make single-phase alternating current input positive bus, on negative bus, or
Second switch break-over of device, the shutdown of first switch device are controlled, is made in the DC supply input inverter that photovoltaic module exports.
The anti-PID header boxs system, wherein the detection control module further includes being used for Sample AC output current
Current sampling unit, the current sampling unit is arranged between first switch device and control unit.
The anti-PID header boxs system, wherein described control unit includes control chip, first resistor, the second electricity
Resistance, the first triode and the second triode；First I/O port of the control chip connects the first triode by first resistor
The collector of base stage, first triode connects first switch device, the emitter ground connection of the first triode；The control core
Second I/O port of piece connects the base stage of the second triode by second resistance, and the collector connection second of second triode is opened
Close device, the emitter ground connection of the second triode.
The anti-PID header boxs system, wherein the voltage sampling unit includes amplifier chip, 3rd resistor, the 4th
Resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the first capacitance, the 5th of the amplifier chip the
Foot connects first switch device, second switch device and positive bus by 3rd resistor, also by the 4th resistance eutral grounding, amplifier
6th foot of chip connects first switch device, second switch device and negative bus by the 5th resistance, also by the 6th resistance
One end of the 7th foot and the 7th resistance of amplifier chip is connected, the other end of the 7th resistance connects the 3rd foot of amplifier chip,
Also by the 8th resistance+3.3V feeder ears, the 1st foot of the 2nd foot connection amplifier chip of the amplifier chip, the amplifier chip
The 1st foot by the 9th resistance connect control chip AD1 pins, also by the first capacity earth, it is described control chip type
Number be STM32F107, the AD1 pins be analog-to-digital conversion pin.
A kind of implementation method of above-mentioned anti-PID header boxs system, wherein the described method comprises the following steps：
Alternating current is loaded on the positive and negative bus-bar of total header box by being closed first switch device, then passes through direct current
Exchange is electrically communicated to each header box by cable, to be powered for anti-PID equipment；
When direct current cables has d. c. voltage signal, disconnects first switch device and close AC power supply, make photovoltaic module
In the DC supply input inverter of output.
The implementation method of the anti-PID header boxs system, wherein further include：By voltage sampling unit to positive and negative remittance
Stream row's voltage signal sample, and sampled result is sent to control chip, is controlled according to sampled result by control chip
Make the shutdown of the first, second switching device.
The implementation method of the anti-PID header boxs system, wherein the voltage sampling unit is to positive and negative bus-bar electricity
The sampling that carries out of pressure signal specifically includes：
It is off when sampling not zero crossing, first switch device, is then loaded into positive and negative bus-bar without alternating current
On；
When sampling zero crossing, in positive half period, bus bar voltage is sampled respectively at the n moment apart from zero crossing
Vm, n value can be obtained, V is labeled as+im；Equally in negative half-cycle, confluence is sampled respectively at the n moment apart from zero crossing
Arrange voltage Vm, it is also possible to obtain n value is labeled as V-im；Then AC compounent Vac and DC component Vdc are calculated by following equation
It obtains：
Viac=V+im- V-im
Vidc= (V+im+ V-im)/2
Wherein, i is 1 integer for arriving n.
Preferably, the implementation method of the anti-PID header boxs system, wherein the control chip is according to sampled result
Shutdown to control the first, second switching device specifically includes：
When DC component Vdc is more than preset first threshold voltage, substrate is in generating state, then controls chip
First switch device is enabled to disconnect, second switch device is closed；
When DC component Vdc is less than preset first threshold voltage, then postpone after a certain period of time, then judge direct current
The size of component Vdc and second threshold voltage：If DC component Vdc is less than second threshold voltage, photovoltaic substrate is in non-power generating
State then controls chip and first switch device is enabled to be closed, and second switch device disconnects.
Compared to the prior art, anti-PID header boxs system and its implementation provided by the invention, without line of increasing exchanges
Alternating current is loaded on direct current cables in total header box when detecting that photovoltaic substrate does not generate electricity, is by direct current cables by cable
Anti- PID equipment power supply, while sampling cable voltage, when detecting that the when of being superimposed with DC voltage on cable closes Alternating Current Power Supply, no
Influence photovoltaic system normal power generation.This programme makes alternating current and direct current use existing cable at times, reduces exchange cable
It goes into operation, reduces power plant construction cost.
Description of the drawings
Fig. 1 is the schematic diagram of photovoltaic generating system DC side in the prior art.
Fig. 2 is the circuit diagram of the preferred embodiment of the anti-PID header boxs system of the present invention.
Fig. 3 be in the anti-PID header boxs network system realization of the present invention control chip according to sampled voltage come control first, the
The flow chart of the shutdown of two switching devices.
Fig. 4 is the schematic diagram for being superimposed the alternating voltage after DC voltage.
Specific implementation mode
The present invention provides a kind of anti-PID header boxs system and its implementation, for make the purpose of the present invention, technical solution and
Effect is clearer, clear, and the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.It should be appreciated that herein
Described specific examples are only used to explain the present invention, is not intended to limit the present invention.
The anti-PID header boxs system of the present invention is for preventing photovoltaic generating system performance caused by PID effects from declining；Its
In, the anti-PID header boxs system includes：One total header box and anti-PID equipment；As shown in Fig. 2, being set inside total header box
It is equipped with the single-phase alternating current input port J1 for accessing single-phase alternating current, for connecting the direct current cables of header box output just
Bus-bar 100, the first switch device K1 of negative bus 200 and the power supply state for controlling single-phase alternating current, for detecting
The generating state of photovoltaic module, and the detection control module of the conducting state according to generating state control first switch device（Figure
In non-label）.
The positive and negative bus-bar passes through photovoltaic generating system described in cable connection by positive and negative input port PV+, PV- respectively
Inverter input terminal, single-phase alternating current input port connects positive and negative bus-bar by first switch device, closed for passing through
It closes first switch device alternating current is loaded on the positive and negative bus-bar of total header box, then fax will be exchanged by direct current cables
It is delivered to each header box.I.e. when photovoltaic substrate does not generate electricity, single-phase alternating current input port total header box by alternating current by just,
Negative bus is loaded on direct current cables, is that anti-PID equipment is powered by direct current cables, when being superimposed with direct current in direct current cable
When pressure, first switch device disconnects, and closes Alternating Current Power Supply, does not influence photovoltaic system normal power generation.
Specifically, the positive bus, negative bus pass through the inverter of photovoltaic generating system described in cable connection
Input terminal, the positive bus, negative bus are also connected with detection control module, and single phase ac is connected also by first switch device
Electrical input mouth, the detection control module connect first switch device.
When the detection control module detection photovoltaic module does not generate electricity, first switch break-over of device is controlled, single phase ac is made
Input single-phase alternating current in electrical input mouth, and alternating current is loaded on the positive and negative bus-bar of total header box, then pass through direct current
Exchange is electrically communicated to each header box by cable；When the detection control module detection photovoltaic module power generation, first switch device is controlled
Part turns off, and makes in the DC supply input inverter that photovoltaic module exports.
Illustrate how the anti-PID header boxs system of the present invention is realized below by a specific embodiment.
Referring to Fig. 2, its circuit diagram for the preferred embodiment of the anti-PID header boxs system of the present invention.As shown,
The input terminal of the external inverter of positive input port PV+ and negative input port PV- of total header box, and by the in total header box
Two switching device K2 (in the present embodiment, the second switch device K2 is double-point double-throw switch, relay etc.) even connect respectively
Onto positive bus 100 and negative bus 200, positive and negative bus-bar connects the direct current cables of each header box output.Single-phase alternating current
Input port J1（As shown, AC power passes through L, N foot position input single-phase alternating current）By first switch device K1 (at this
In embodiment, the first switch device K1 is relay etc.) it is connected on positive and negative bus-bar；It is not sent out for working as photovoltaic substrate
It when electric, be closed first switch device and alternating current is loaded on the positive and negative bus-bar of total header box, then will be handed over by direct current cables
Galvanic electricity is transmitted to each header box, to be powered for anti-PID equipment.
In the present embodiment, the second switch device K2 is optional device, can also use the devices such as other contactors
To realize.
Further, in the present embodiment, the detection control module includes the generating state for detecting photovoltaic module
Voltage sampling unit 10 and for controlling first switch device and second switch device according to the generating state of photovoltaic module
The control unit 30 of conducting state.The effect of voltage sampling unit 10 can detect direct current, alternating current and superposition direct current
The voltage signals such as alternating current, and voltage signal is converted into the signal that chip U1 can be identified in order to control.
When it is implemented, direct current, alternating current and the alternating current for being superimposed direct current are detected by voltage sampling unit 10, and will
Voltage signal is converted to digital signal and exports to control unit 30, and described control unit 30 is detected according to voltage sampling unit root and tied
Fruit controls first switch device K1 conductings, the K2 shutdowns of second switch device, makes single-phase alternating current input positive bus 100, bears and converge
On stream row 200, or control second switch device K2 conductings, the K1 shutdowns of first switch device, the direct current for making photovoltaic module export
In electricity input inverter.
Please continue to refer to Fig. 2, described control unit includes control chip U1, first resistor R1, second resistance R2, the one or three
Pole pipe Q1 and the second triode Q2；First I/O port of the control chip connects the base stage of the first triode by first resistor,
The collector of first triode connects first switch device, the emitter ground connection of the first triode；The control chip
Second I/O port connects the base stage of the second triode by second resistance, and the collector of second triode connects second switch device
Part, the emitter ground connection of the second triode.When the first I/O port exports high level, the first triode is opened, and first switch device is made
Part K1 conductings, when the second I/O port exports high level, the second triode is opened, and so that second switch device K2 is connected, as the first IO
When mouth, the second I/O port output low level, corresponding triode cut-off.
MCU or DSP may be used in control chip U1, uses STM32F107 chips in the present embodiment.The control chip
U1 is separately connected first switch device K1 and second switch device K2（As shown, the CON1 feet of U1 connect K1, the CON2 feet of U1
Connect K2）.The shutdown of K1 and K2 are controlled by controlling the low and high level signal that chip is sent.
Please continue to refer to Fig. 2, the voltage sampling unit includes amplifier chip（Amplifier chip is by the U1A and U1B in Fig. 2
It is integrated, such as model：LM258 amplifier chips）, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th
Resistance R7, the 8th resistance R8, the 9th resistance R9 and the first capacitance C1.
5th foot of the amplifier chip connects first switch device, second switch device and positive confluence by 3rd resistor
Row, also by the 4th resistance eutral grounding, the 6th foot of amplifier chip connects first switch device, second switch device by the 5th resistance
Part and negative bus connect one end of the 7th foot and the 7th resistance of amplifier chip also by the 6th resistance, the 7th resistance
The other end connects the 3rd foot of amplifier chip, also by the 8th resistance+3.3V feeder ears, the 2nd foot connection fortune of the amplifier chip
The 1st foot of chip is put, the 1st foot of the amplifier chip connects the AD1 pins of control chip by the 9th resistance, also by first
Capacity earth.By 3rd resistor and the 5th resistance sampling direct current, alternating current and the alternating current for being superimposed direct current, and electric current is straight
Corresponding voltage is converted to, digital signal is converted to by amplifier chip, corresponding three pole is controlled by I0 through controlling chip processing
Pipe is connected.
Likewise, the detection control module further include current sampling unit for Sample AC output current, institute
It states current sampling unit to be arranged between first switch device and control unit, effect is Sample AC output current, is used for
Stream protection.Since the circuit structure and operation principle of current sampling unit are identical as voltage sampling unit, details are not described herein again.
The present invention also provides a kind of implementation methods of anti-PID header boxs system, the described method comprises the following steps：
Alternating current is loaded on the positive and negative bus-bar of total header box by being closed first switch device, then passes through direct current
Exchange is electrically communicated to each header box by cable, to be powered for anti-PID equipment；
When direct current cables has d. c. voltage signal, disconnects first switch device and close AC power supply, make photovoltaic module
In the DC supply input inverter of output.
Further, in the implementation method of the anti-PID header boxs system, further include：Pass through voltage sampling unit pair
Positive and negative bus bar voltage signal sample, and sampled result is sent to control chip, is tied according to sampling by control chip
Fruit controls the shutdown of the first, second switching device.
Specifically, in the implementation method of the anti-PID header boxs system, the voltage sampling unit is to positive and negative remittance
The sampling that carries out of stream row's voltage signal specifically includes：
It is off when sampling not zero crossing, first switch device, is then loaded into positive and negative bus-bar without alternating current
On；
When sampling zero crossing, in positive half period, bus bar voltage is sampled respectively at the n moment apart from zero crossing
Vm, n value can be obtained, V is labeled as+im；Equally in negative half-cycle, confluence is sampled respectively at the n moment apart from zero crossing
Arrange voltage Vm, it is also possible to obtain n value is labeled as V-im；Then AC compounent Vac and DC component Vdc are calculated by following equation
It obtains：
Viac=V+im- V-im
Vidc= (V+im+ V-im)/2
Wherein, i is 1 integer for arriving n.
In addition Fig. 3 is referred to, the control chip has according to sampled result come the shutdown for controlling the first, second switching device
Body includes：
When DC component Vdc is more than preset first threshold voltage Vset1, substrate is in generating state, then controls
Coremaking piece enables first switch device K1 disconnect, and second switch device K2 is closed（That is CON1 exports low level, the high electricity of CON2 outputs
It is flat）；
When DC component Vdc is less than preset first threshold voltage Vset1, then postpone certain time（It is used in figure
Delay indicates for t seconds）Afterwards, then judge the size of DC component Vdc and second threshold voltage Vset2：If DC component Vdc is less than the
Two threshold voltages, photovoltaic substrate are in non-power generating state, then control chip and first switch device K1 is enabled to be closed, second switch device
K2 is disconnected（That is CON1 exports high level, and CON2 exports low level）.
In conclusion anti-PID header boxs system provided by the invention and its implementation, wherein the anti-PID header boxs
System includes：One total header box；Total header box is internally provided with the positive and negative of the direct current cables for connecting header box output
Bus-bar and first switch device；The positive and negative bus-bar is connected to the input of inverter by positive and negative input port respectively
End, single-phase alternating current input port connect positive and negative bus-bar by first switch device, for by being closed first switch device
Alternating current is loaded on the positive and negative bus-bar of total header box, then exchange is electrically communicated to by each header box by direct current cables.This
Scheme makes alternating current and direct current use existing cable at times, reduces exchange cable and goes into operation, reduces power plant construction cost.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect range.
Claims (10)
1. a kind of anti-PID header boxs system, for preventing photovoltaic generating system performance caused by PID effects from declining；Its feature exists
In the anti-PID header boxs system includes：One total header box and anti-PID equipment；Total header box is internally provided with for connecing
Enter the single-phase alternating current input port of single-phase alternating current, the positive bus for connecting the direct current cables that header box exports, negative remittance
Stream row, power supply state for controlling single-phase alternating current first switch device, the generating state for detecting photovoltaic module, and
The detection control module of the conducting state of first switch device is controlled according to generating state；
The positive bus, negative bus by the input terminal of the inverter of photovoltaic generating system described in cable connection, it is described just
Bus-bar, negative bus are also connected with detection control module, and single-phase alternating current input port, institute are connected also by first switch device
State detection control module connection first switch device；
When the detection control module detection photovoltaic module does not generate electricity, first switch break-over of device is controlled, keeps single-phase alternating current defeated
Input single-phase alternating current in inbound port, and alternating current is loaded on the positive and negative bus-bar of total header box, then pass through direct current cables
Exchange is electrically communicated to each header box, and is powered for anti-PID equipment by direct current cables；The detection control module detects photovoltaic
When component generates electricity, control first switch device shutdown makes in the DC supply input inverter that photovoltaic module exports.
2. anti-PID header boxs system according to claim 1, which is characterized in that further include second switch device, described
Two switching devices are arranged between positive bus, negative bus and the terminals for connecting inverter cables.
3. anti-PID header boxs system according to claim 2, which is characterized in that the detection control module includes being used for
Detect the voltage sampling unit of the generating state of photovoltaic module and for controlling first switch according to the generating state of photovoltaic module
The control unit of the conducting state of device and second switch device；By voltage sampling unit detection direct current, alternating current and superposition
The alternating current of direct current, and voltage signal is converted into digital signal and is exported to control unit, described control unit is according to voltage
Sampling unit root testing result controls first switch break-over of device, the shutdown of second switch device, makes single-phase alternating current input is positive to converge
On stream row, negative bus, or control second switch break-over of device, the shutdown of first switch device, so that photovoltaic module is exported straight
Galvanic electricity inputs in inverter.
4. anti-PID header boxs system according to claim 3, which is characterized in that the detection control module further includes using
In the current sampling unit of Sample AC output current, the current sampling unit is arranged in first switch device and control unit
Between.
5. anti-PID header boxs system according to claim 3, which is characterized in that described control unit include control chip,
First resistor, second resistance, the first triode and the second triode；First I/O port of the control chip is connected by first resistor
The base stage of the first triode is connect, the collector of first triode connects first switch device, the emitter of the first triode
Ground connection；Second I/O port of the control chip connects the base stage of the second triode by second resistance, second triode
Collector connects second switch device, the emitter ground connection of the second triode.
6. anti-PID header boxs system according to claim 5, which is characterized in that the voltage sampling unit includes amplifier
Chip, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the first electricity
Holding, the 5th foot of the amplifier chip connects first switch device, second switch device and positive bus by 3rd resistor,
By the 4th resistance eutral grounding, the 6th foot of amplifier chip connects first switch device, second switch device by the 5th resistance and bears
Bus-bar connects one end of the 7th foot and the 7th resistance of amplifier chip, the other end of the 7th resistance also by the 6th resistance
The 3rd foot for connecting amplifier chip, also by the 8th resistance+3.3V feeder ears, the 2nd foot of the amplifier chip connects amplifier chip
The 1st foot, the 1st foot of the amplifier chip connected the AD1 pins of control chip by the 9th resistance, connect also by the first capacitance
Ground, the model STM32F107 of the control chip, the AD1 pins are analog-to-digital conversion pin.
7. a kind of implementation method of anti-PID header boxs system described in claim 1, which is characterized in that the method includes with
Lower step：
Alternating current is loaded on the positive and negative bus-bar of total header box by being closed first switch device, then passes through direct current cables
Exchange is electrically communicated to each header box, to be powered for anti-PID equipment；
When direct current cables has d. c. voltage signal, disconnects first switch device and close AC power supply, photovoltaic module is made to export
DC supply input inverter in.
8. the implementation method of anti-PID header boxs system according to claim 7, which is characterized in that further include：Pass through voltage
Sampling unit is sampled to positive and negative bus bar voltage signal, and sampled result is sent to control chip, by control chip
The shutdown of the first, second switching device is controlled according to sampled result.
9. the implementation method of anti-PID header boxs system according to claim 8, which is characterized in that the voltage sample list
Member specifically includes the sampling that carries out of positive and negative bus bar voltage signal：
It is off, is then loaded on positive and negative bus-bar without alternating current when sampling not zero crossing, first switch device；
When sampling zero crossing, in positive half period, bus bar voltage V is sampled respectively at the n moment apart from zero crossingm, can be with
N value is obtained, V is labeled as+im；Equally in negative half-cycle, bus bar voltage is sampled respectively at the n moment apart from zero crossing
Vm, it is also possible to obtain n value is labeled as V-im；Then AC compounent ViAc and DC component ViDc is calculated by following equation：
Viac=V+im- V-im
Vidc= (V+im+ V-im)/2
Wherein, i is 1 integer for arriving n.
10. the implementation method of anti-PID header boxs system according to claim 8, which is characterized in that the control chip root
It is specifically included according to sampled result to control the shutdown of the first, second switching device：
When DC component Vdc is more than preset first threshold voltage, substrate is in generating state, then controls chip and enable the
One switching device disconnects, and second switch device is closed；
When DC component Vdc is less than preset first threshold voltage, then postpone after a certain period of time, then judge DC component
The size of Vdc and second threshold voltage：If DC component Vdc is less than second threshold voltage, photovoltaic substrate is in non-power generating state,
Then controlling chip enables first switch device be closed, and second switch device disconnects.
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