CN107947736A - A kind of photovoltaic generation elastic controller and its control method - Google Patents
A kind of photovoltaic generation elastic controller and its control method Download PDFInfo
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- CN107947736A CN107947736A CN201711455190.6A CN201711455190A CN107947736A CN 107947736 A CN107947736 A CN 107947736A CN 201711455190 A CN201711455190 A CN 201711455190A CN 107947736 A CN107947736 A CN 107947736A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 91
- 230000001012 protector Effects 0.000 claims abstract description 29
- 230000000903 blocking effect Effects 0.000 claims abstract description 12
- 238000002955 isolation Methods 0.000 claims abstract description 6
- 230000005611 electricity Effects 0.000 claims description 14
- 238000000819 phase cycle Methods 0.000 claims description 12
- 238000010248 power generation Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000005755 formation reaction Methods 0.000 description 68
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000008030 elimination Effects 0.000 description 4
- 238000003379 elimination reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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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
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
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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
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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
-
- 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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a kind of photovoltaic generation elastic controller and its control method in photovoltaic generation control technology field, including some photovoltaic generation string formation circuits, photovoltaic generation string formation circuit includes multiple photovoltaic electrification components being connected in series；Current sensor, current sensor detect the reverse current information in photovoltaic generating set serializer circuit and feed back to reverse current controller；Automatic protector, reverse current controller are blocked and isolated to photovoltaic string formation circuit according to the reverse current information control automatic protector received, meanwhile, the isolation and blocking to photovoltaic string formation circuit can be eliminated；Wherein, each photovoltaic generation string formation circuit is independently furnished with a current sensor and automatic protector；Reverse current is detected and controlled using the elastic controller；While the present invention can automatically detect and eliminate reverse current, ensure photovoltaic system normal operating conditions, improve the utilization rate of photovoltaic electric energy.
Description
Technical field
The invention belongs to photovoltaic generation control technology field, more particularly to a kind of photovoltaic generation elastic controller and its control
Method processed.
Background technology
In recent years, photovoltaic microgrid is quickly grown, and more and more photovoltaic micro-grid power generation systems are linked into power grid, photovoltaic hair
The subsystems included by DC terminal in electric system have：Photovoltaic panel array string formation system, header box and DC-DC conversion
Device etc., many parallel photovoltaic generation string formation circuits are connected to the direct-flow input end of same concentration inverter, light by header box
The photovoltaic electrification component that volt generating set serializer circuit is serially connected by several forms, but is matched by photovoltaic generating set serializer circuit
The influence of shadow is hidden with part, some photovoltaic panel array string formations cannot not only generate electricity, on the contrary into " load " of absorbed power, electric current
Direction is reversed so as to produce reverse current, and reverse current can cause photovoltaic plate array " hot spot phenomenon " so that the power generation of system
Reliability is subject to the undesirable influence of a certain photovoltaic cells group working status and substantially reduces, so as to can not ensure whole photovoltaic system
Optimum efficiency and electric production capacity.
In order to eliminate the influence that reverse current generates electricity photovoltaic system, in the prior art, on photovoltaic generation string formation circuit
The interface box of a photovoltaic array is simply added, every a string of photovoltaic string formation is monitored, such as wherein there is string formation work
Abnormal, system will pass to this information on remote controllers, while can stop work by this string by remote control
Work, or staff is reminded note that can not still realize automatic elimination reverse current and add automatically again by sound-light alarm
Enter this string of function.
The content of the invention
For in the prior art the defects of, it is an object of the invention to overcome above-mentioned shortcoming of the prior art, carry
For a kind of photovoltaic generation elastic controller and its control method, solve after can not eliminating reverse current automatically in the prior art
The technical problem of electricity generation system is automatically added to, while the present invention can automatically detect and eliminate reverse current, ensures photovoltaic
System worked well state, improves the utilization rate of photovoltaic electric energy.
The object of the present invention is achieved like this：A kind of photovoltaic generation elastic controller, including
Some photovoltaic generation string formation circuits, the photovoltaic generation string formation circuit include multiple photovoltaic electrification components being connected in series；
Current sensor, the current sensor detect the reverse current information in photovoltaic generating set serializer circuit and feed back to reversely
Current controller；
Automatic protector, the reverse current controller control automatic protector to photovoltaic according to the reverse current information received
String formation circuit is blocked and isolated, meanwhile, the isolation and blocking to photovoltaic string formation circuit can be eliminated；
Wherein, each photovoltaic generation string formation circuit is independently furnished with a current sensor and automatic protector.
In order to realize the real-time detection of electric current, the high-pressure side connection current sensor of any photovoltaic string formation circuit is just
Pole, current sensor anode connection DC-to-dc converter one end, the other end of the DC-to-dc converter with from
The input terminal connection of dynamic protector.
In order to realize, the automatic of reverse current eliminates in photovoltaic generating system, and the automatic protector includes protection circuit,
The protection circuit includes controlling switch one, the cathode of the anode connection controlling switch two of the controlling switch one, the control
The low-pressure end of the anode connection photovoltaic generation string formation circuit of switch two, the control terminal one and control terminal two of controlling switch one with instead
Connected to current controller；When being high voltage at the control terminal one of the reverse current controller drive control switch one, control
The conducting of switch one；When being high voltage at the control terminal two of reverse current controller drive control switch one, controlling switch one is ended；
The control terminal one and control terminal two of the controlling switch two are connected with reverse current controller；Reverse current controller driving control
When being high voltage at the control terminal one of system switch two, controlling switch two turns on；Reverse current controller drive control switch two
When being high voltage at control terminal two, controlling switch two is ended；The other end of the DC-to-dc converter and controlling switch one
Cathode connects.
It is described automatic in order to make the photovoltaic generation string formation circuit after elimination reverse current rejoin in photovoltaic generating system
Protector further includes self-checking circuit, and the self-checking circuit includes controlling switch three, and the cathode connection direct current of the controlling switch three-
The other end of direct current transducer, anode connection self-test resistance one end of controlling switch three, the other end connection of the self-test resistance
The low-pressure end of photovoltaic generation string formation circuit, the control terminal one and control terminal two of controlling switch three connect with negative-phase sequence curent controller
Connect, when being high voltage at the control terminal one of negative-phase sequence curent controller drive control switch three, controlling switch three turns on；Negative-phase sequence curent
When being high voltage at the control terminal two of controller drive control switch three, controlling switch three is ended；In this design, current sensor
Detect no reverse current signal, three conducting of reverse current controller drive control switch, while reverse current controller is examined
Measure self-checking circuit it is logical when（Illustrate that the photovoltaic generation string formation circuit generates electricity again at this time）, the driving control of negative-phase sequence curent controller
Two cut-off of system switch, makes the photovoltaic string formation circuit no longer be isolated, which is added in photovoltaic generating system
Again generate electricity.
Infringement of the reverse current to photovoltaic electrification component in order to prevent, the photovoltaic generation string formation circuit further include blocking two
Pole pipe, the high-pressure side for the photovoltaic electrification component being serially connected and the cathode of blocking diode connect, the anode of blocking diode
Connect one end of current sensor.
In order to realize independent protective of each automatic protector to corresponding photovoltaic generation string formation circuit, each photovoltaic
The low-pressure end of generating set serializer circuit links together, and the anode of each controlling switch one links together.
The method being controlled using the photovoltaic generation elastic controller to photovoltaic generation, is comprised the following steps：
（1）Direct current transducer detects the reverse current of photovoltaic generating set serializer circuit and sends out the reverse current information detected in real time
Give reverse current controller；
（2）Determine whether reverse current signal, if without reverse current signal, reverse current controller and automatic protector are equal
Any action, the power generation of photovoltaic generation string formation circuit are not done；If there is reverse current signal in a certain photovoltaic generation string formation circuit, reversely
Current controller controls all controlling switches one to end, meanwhile, reverse current controller drives corresponding controlling switch two to turn on,
The photovoltaic generation string formation circuit is set to isolate with other photovoltaic generation string formation circuits；
（3）Return to step（1）, detect whether the above-mentioned photovoltaic generation string formation circuit for having negative-phase sequence curent signal still has reverse current
Signal, if detecting do not have reverse current signal in the photovoltaic generation string formation circuit, reverse current controller drives other nothings to ask
The corresponding controlling switch one of photovoltaic generation string formation circuit of topic turns on, and reverse current controller drives corresponding controlling switch three to lead
Logical, if reverse current controller detects that self-checking circuit leads to, reverse current controller drives corresponding controlling switch two to end
And corresponding controlling switch one turns on, above-mentioned photovoltaic generation string formation circuit is no longer isolated, and the photovoltaic generation string formation circuit is automatic
Again generate electricity；
（4）Return to step（1）, circulation execution above step.
In order to improve photovoltaic electric energy production, the step（2）In, if not detecting reverse current, reverse current control
Whether device detection self-checking circuit is connected, if certain self-checking circuit is connected, reverse current controller drives corresponding controlling switch one to lead
Lead to, drive corresponding controlling switch three to end while control corresponding controlling switch two to end；Otherwise, reverse current controller and
Automatic protector does not do any action；In this design, when detecting that self-checking circuit is connected, occurred in the cycle before illustrating
Reverse current, corresponding photovoltaic generation string formation circuit is still within isolation, and the photovoltaic generation string formation circuit can normally be sent out
Electricity, conducting, the cut-off of controlling switch two and the cut-off of controlling switch three of reverse current controller drive control switch one, makes this
Photovoltaic generation string formation circuit normal power generation, self-checking circuit disconnects, to ensure photovoltaic electric energy production to greatest extent.
Compared with prior art, the technique effect that has of the present invention is：Pass through current sensor, direct current-straight in the present invention
The combination of stream transformer, automatic protector and reverse-current protection device is set, automatic to detect reverse current and eliminate automatically reverse
Electric current, ensures the normal operating conditions of photovoltaic generating system, improves the stability and reliability of photovoltaic generating system power generation, extends
The effective time of system, after eliminating reverse current, can rejoin photovoltaic generation by corresponding photovoltaic generation string formation electric current
System, ensures photovoltaic electric energy production to greatest extent.
Brief description of the drawings
Fig. 1 is reverse current feedback control loop general structure schematic diagram in the present invention.
Fig. 2 is the physical circuit schematic diagram of photovoltaic generating system in the present invention.
Fig. 3 is the FB(flow block) of reverse current controller perturbation in the present invention.
Embodiment
With reference to specific embodiment, the invention will be further described.
A kind of photovoltaic generation elastic controller as shown in FIG. 1 to 3, including
Some photovoltaic generation string formation circuits, photovoltaic generation string formation circuit include at least one photovoltaic electrification component being connected in series；
Current sensor, current sensor detect the reverse current information in photovoltaic generating set serializer circuit and feed back to reverse current
Controller；
Automatic protector, reverse current controller control automatic protector to photovoltaic string formation according to the reverse current information received
Circuit is blocked and isolated, meanwhile, the isolation and blocking to photovoltaic string formation circuit can be eliminated；
Wherein, each photovoltaic generation string formation circuit is independently furnished with a current sensor and automatic protector, photovoltaic generation string formation
The number of circuit is at least 1.
In order to realize, the automatic of reverse current eliminates in photovoltaic generating system, and automatic protector includes protection circuit, protection
Circuit includes controlling switch one, the cathode of the anode connection controlling switch two of controlling switch one, the anode connection of controlling switch two
The low-pressure end of photovoltaic generation string formation circuit, the control terminal one and control terminal two of controlling switch one connect with reverse current controller
Connect；When being high voltage at the control terminal one of reverse current controller drive control switch one, controlling switch one turns on；Reverse current
When being high voltage at the control terminal two of controller drive control switch one, controlling switch one is ended；The control terminal of controlling switch two
One and control terminal two be connected with reverse current controller；It is at the control terminal one of reverse current controller drive control switch two
During high voltage, controlling switch two turns on；When being high voltage at the control terminal two of reverse current controller drive control switch two, control
Two cut-off of system switch；In order to realize the real-time detection of electric current, the high-pressure side connection current sensor of any photovoltaic string formation circuit
Cathode, one end of the anode connection DC-to-dc converter of current sensor, the other end of DC-to-dc converter and control
The cathode connection of switch one.
In order to make the photovoltaic generation string formation circuit after elimination reverse current rejoin in photovoltaic generating system, automatic protection
Device further includes self-checking circuit, and self-checking circuit includes controlling switch three, the cathode connection DC-to-dc converter of controlling switch three
The other end, anode connection self-test resistance one end of controlling switch three, the other end connection photovoltaic generation string formation circuit of self-test resistance
Low-pressure end, the control terminal one and control terminal two of controlling switch three be connected with negative-phase sequence curent controller, negative-phase sequence curent controller
When being high voltage at the control terminal one of drive control switch three, controlling switch three turns on；Negative-phase sequence curent controller drive control is opened
When being high voltage at the control terminal two of pass three, controlling switch three is ended.
Infringement of the reverse current to photovoltaic electrification component in order to prevent, photovoltaic generation string formation circuit, which further includes, blocks two poles
Pipe, the high-pressure side for the photovoltaic electrification component being serially connected and the cathode of blocking diode connect, and the anode of blocking diode connects
Connect one end of current sensor.
In order to realize independent protective of each automatic protector to corresponding photovoltaic generation string formation circuit, each photovoltaic generation
The low-pressure end of string formation circuit links together, and the anode of each controlling switch one links together.
Wherein, the concrete structure of the photovoltaic generating system in the present invention is that the anode connection DC terminal of controlling switch one is converged
One end of case capacitance and one end of inverter are flowed, the low-pressure end of photovoltaic generation string formation circuit connects the another of DC terminal header box capacitance
One end and the other end of inverter, inverter will be fed electric energy at exchange end, to power to AC network；It is in addition, reversely electric
Microcontroller can be selected in stream controller.
The method being controlled using photovoltaic generation elastic controller to photovoltaic generation（As shown in Figure 3）, including it is following
Step：
（1）Direct current transducer detects the reverse current of photovoltaic generating set serializer circuit and sends out the reverse current information detected in real time
Give reverse current controller；
（2）Reverse current signal is determined whether, if without reverse current signal, reverse current controller detection self-checking circuit connects
Whether logical, if certain self-checking circuit is connected, reverse current controller drives corresponding controlling switch one to turn on, drive corresponding control
The cut-off of switch three controls corresponding controlling switch two to end at the same time；Otherwise, reverse current controller and automatic protector are not appointed
What is acted, the power generation of photovoltaic generation string formation circuit；If there are reverse current signal, reverse current control in a certain photovoltaic generation string formation circuit
Device processed controls all controlling switches one to end, meanwhile, reverse current controller drives corresponding controlling switch two to turn on, and makes the light
Volt generating set serializer circuit is isolated with other photovoltaic generation string formation circuits；
（3）Return to step（1）, detect whether the above-mentioned photovoltaic generation string formation circuit for having negative-phase sequence curent signal still has reverse current
Signal, if detecting do not have reverse current signal in the photovoltaic generation string formation circuit, reverse current controller drives other nothings to ask
The corresponding controlling switch one of photovoltaic generation string formation circuit of topic turns on, and reverse current controller drives corresponding controlling switch three to lead
Logical, if reverse current controller detects that self-checking circuit leads to, reverse current controller drives corresponding controlling switch two to end
And corresponding controlling switch one turns on, above-mentioned photovoltaic generation string formation circuit is no longer isolated, and the photovoltaic generation string formation circuit is automatic
Again generate electricity；
（4）Return to step（1）, circulation execution above step.
A specific embodiment is enumerated below, as shown in Fig. 2, there is n photovoltaic generation string formation electricity in photovoltaic generating system
, there is reverse current in first photovoltaic generation string formation circuit in road, and reverse current do not occur in other photovoltaic generation string formation circuits,
One cut-off of reverse current controller drive control switch, makes all generating set serializer circuits be process is-then temporarily-suspended, reverse current control
Device drives corresponding with the first photovoltaic generation string formation circuit controlling switch two to turn on, make the first photovoltaic generation string formation circuit with it is other
String formation circuit is isolated, after current sensor shows that reverse current disappears, the other power generation string formation electricity of reverse current controller conducting
The corresponding controlling switch one in road is continued generating-charging to DC terminal header box capacitance, to maintain the normal work of photovoltaic generating system
Make, meanwhile, the corresponding controlling switch three of the first photovoltaic string formation circuit of driving turns on, to turn on the self-test influenced by reverse current
Circuit, this photovoltaic generation string formation circuit is in isolation, if damaging therebetween, can wait it is to be repaired, or if hide
Gear eliminates, and photovoltaic circuit generates electricity again automatically, and the current sensor being connected with photovoltaic generation string formation circuit one continues monitoring in real time
The circuit current signal, the above are an execution cycle of reverse current resilient controller；In addition, opening in each execution cycle
Begin, if not detecting reverse current, reverse current resilient controller detects whether that the self-checking circuit of certain photovoltaic string formation connects
Whether logical, if certain self-checking circuit is connected, there is reverse current in the cycle before explanation, the string formation is existing still in barrier-like
State, present Failure elimination, has been able to normal power generation, so positive generation current signal can be detected by self-checking circuit,
In this case, reverse current resilient controller conducting automatic protector controlling switch one makes it be incorporated to power generation electricity to turn on the string formation
Road simultaneously simultaneously switches off protector controlling switch three to disconnect self-checking circuit.
Pass through the knot of current sensor, DC-to-dc converter, automatic protector and reverse-current protection device in the present invention
Close and set, it is automatic to detect reverse current and eliminate reverse current automatically, ensure the normal operating conditions of photovoltaic generating system, improve
The stability and reliability of photovoltaic generating system power generation, extend effective time of system, can will be right after eliminating reverse current
The photovoltaic generation string formation electric current answered rejoins photovoltaic generating system, ensures photovoltaic electric energy production to greatest extent.
The invention is not limited in above-described embodiment, on the basis of technical solution disclosed by the invention, the skill of this area
Art personnel are according to disclosed technology contents, it is not necessary to which performing creative labour can make one to some of which technical characteristic
A little to replace and deform, these are replaced and deformation is within the scope of the present invention.
Claims (8)
1. a kind of photovoltaic generation elastic controller, including some photovoltaic generation string formation circuits, the photovoltaic generation string formation circuit
Including multiple photovoltaic electrification components being connected in series, it is characterised in that
Including current sensor, the current sensor detects the reverse current information in photovoltaic generating set serializer circuit and feeds back to
Reverse current controller；
Automatic protector, the reverse current controller control automatic protector to photovoltaic according to the reverse current information received
String formation circuit is blocked and isolated, meanwhile, the isolation and blocking to photovoltaic string formation circuit can be eliminated；
Wherein, each photovoltaic generation string formation circuit is independently furnished with a current sensor and automatic protector.
A kind of 2. photovoltaic generation elastic controller according to claim 1, it is characterised in that any photovoltaic string formation
The cathode of the high-pressure side connection current sensor of circuit, one end of the anode connection DC-to-dc converter of current sensor, institute
The input terminal of the other end and automatic protector of stating DC-to-dc converter connects.
A kind of 3. photovoltaic generation elastic controller according to claim 2, it is characterised in that the automatic protector bag
Protection circuit is included, the protection circuit includes controlling switch one, and the anode connection controlling switch two of the controlling switch one is just
Pole, the low-pressure end of the anode connection photovoltaic generation string formation circuit of the controlling switch two, the control terminal one of controlling switch one and control
End two processed is connected with reverse current controller；It is height at the control terminal one of the reverse current controller drive control switch one
During voltage, controlling switch one turns on；When being high voltage at the control terminal two of reverse current controller drive control switch one, control
The cut-off of switch one；The control terminal one and control terminal two of the controlling switch two are connected with reverse current controller；Reverse current
When being high voltage at the control terminal one of controller drive control switch two, controlling switch two turns on；Reverse current controller drives
When being high voltage at the control terminal two of controlling switch two, controlling switch two is ended；The other end of the DC-to-dc converter with
The cathode connection of controlling switch one.
A kind of 4. photovoltaic generation elastic controller according to Claims 2 or 3, it is characterised in that the automatic protection
Device further includes self-checking circuit, and the self-checking circuit includes controlling switch three, the cathode connection DC-DC of the controlling switch three
The other end of converter, anode connection self-test resistance one end of controlling switch three, the other end connection photovoltaic of the self-test resistance
The low-pressure end of generating set serializer circuit, the control terminal one and control terminal two of controlling switch three are connected with negative-phase sequence curent controller, instead
When being high voltage at the control terminal one of phase current controller drive control switch three, controlling switch three turns on；Negative-phase sequence curent controls
When being high voltage at the control terminal two of device drive control switch three, controlling switch three is ended.
A kind of 5. photovoltaic generation elastic controller according to claim 4, it is characterised in that the photovoltaic generation string formation
Circuit further includes blocking diode, and the high-pressure side for the photovoltaic electrification component being serially connected and the cathode of blocking diode connect,
One end of the anode connection current sensor of blocking diode.
A kind of 6. photovoltaic generation elastic controller according to claim 4, it is characterised in that each photovoltaic generation
The low-pressure end of string formation circuit links together, and the anode of each controlling switch one links together.
7. usage right requires the side that 1~6 any one of them photovoltaic generation elastic controller is controlled photovoltaic generation
Method, it is characterised in that comprise the following steps：
（1）Direct current transducer detects the reverse current of photovoltaic generating set serializer circuit and sends out the reverse current information detected in real time
Give reverse current controller；
（2）Determine whether reverse current signal, if without reverse current signal, reverse current controller and automatic protector are equal
Any action, the power generation of photovoltaic generation string formation circuit are not done；If there is reverse current signal in a certain photovoltaic generation string formation circuit, reversely
Current controller controls all controlling switches one to end, meanwhile, reverse current controller drives corresponding controlling switch two to turn on,
The photovoltaic generation string formation circuit is set to isolate with other photovoltaic generation string formation circuits；
（3）Return to step（1）, detect whether the above-mentioned photovoltaic generation string formation circuit for having negative-phase sequence curent signal still has reverse current
Signal, if detecting do not have reverse current signal in the photovoltaic generation string formation circuit, reverse current controller drives other nothings to ask
The corresponding controlling switch one of photovoltaic generation string formation circuit of topic turns on, and reverse current controller drives corresponding controlling switch three to lead
Logical, if reverse current controller detects that self-checking circuit leads to, reverse current controller drives corresponding controlling switch two to end
And corresponding controlling switch one turns on, above-mentioned photovoltaic generation string formation circuit is no longer isolated, and the photovoltaic generation string formation circuit is automatic
Again generate electricity；
（4）Return to step（1）, circulation execution above step.
8. control method according to claim 7, it is characterised in that the step（2）In, if not detecting reverse electricity
Stream, whether reverse current controller detection self-checking circuit is connected, if certain self-checking circuit is connected, reverse current controller driving corresponds to
Controlling switch one turn on, drive corresponding controlling switch three to end while control corresponding controlling switch two to end；Otherwise, instead
Any action is not done to current controller and automatic protector.
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| CN201711455190.6A CN107947736B (en) | 2017-12-28 | 2017-12-28 | Photovoltaic power generation elastic control device and control method thereof |
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