CN107947736B - Photovoltaic power generation elastic control device and control method thereof - Google Patents
Photovoltaic power generation elastic control device and control method thereof Download PDFInfo
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- CN107947736B CN107947736B CN201711455190.6A CN201711455190A CN107947736B CN 107947736 B CN107947736 B CN 107947736B CN 201711455190 A CN201711455190 A CN 201711455190A CN 107947736 B CN107947736 B CN 107947736B
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- 238000010248 power generation Methods 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000001012 protector Effects 0.000 claims abstract description 28
- 230000000903 blocking effect Effects 0.000 claims abstract description 13
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 230000000712 assembly Effects 0.000 abstract description 3
- 238000000429 assembly Methods 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process 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 photovoltaic power generation elastic control device and a control method thereof in the technical field of photovoltaic power generation control, wherein the photovoltaic power generation elastic control device comprises a plurality of photovoltaic power generation group string circuits, and each photovoltaic power generation group string circuit comprises a plurality of photovoltaic power generation assemblies which are connected in series; the current sensor detects reverse current information in the photovoltaic power generation group string circuit and feeds the reverse current information back to the reverse current controller; the automatic protector is controlled by the reverse current controller to block and isolate the photovoltaic string circuit according to the received reverse current information, and meanwhile, the isolation and blocking of the photovoltaic string circuit can be eliminated; each photovoltaic power generation group string circuit is independently provided with a current sensor and an automatic protector; detecting and controlling the reverse current by using the elastic control device; the invention can automatically detect and eliminate reverse current, ensure the normal working state of the photovoltaic system and improve the utilization rate of photovoltaic electric energy.
Description
Technical Field
The invention belongs to the technical field of photovoltaic power generation control, and particularly relates to a photovoltaic power generation elastic control device and a photovoltaic power generation elastic control method.
Background
In recent years, the development of a photovoltaic micro-grid is rapid, more and more photovoltaic micro-grid power generation systems are connected into a power grid, and each subsystem included in a direct current end in the photovoltaic power generation system is as follows: the photovoltaic panel array string system, the combiner box, the direct current-direct current converter and the like, a plurality of parallel photovoltaic power generation string circuits are connected to the direct current input end of the same centralized inverter through the combiner box, the photovoltaic power generation string circuits are composed of a plurality of photovoltaic power generation assemblies which are connected in series, but are influenced by matching and partial shading of the photovoltaic power generation string circuits, some photovoltaic panel array strings cannot generate power, a load absorbing power is formed, the current direction is reversed, reverse current is generated, and the reverse current can cause a hot spot phenomenon of the photovoltaic panel array, so that the power generation reliability of the system is greatly reduced due to the bad influence of the working state of a certain photovoltaic unit group, and the optimal efficiency and the electric productivity of the whole photovoltaic system cannot be ensured.
In order to eliminate the influence of reverse current on the power generation of a photovoltaic system, in the prior art, an interface box of a photovoltaic array is simply added on a photovoltaic power generation string circuit to monitor the photovoltaic group string of each string, if one group of strings work abnormally, the system can transmit the information to a remote controller, and meanwhile, the string can be stopped through remote control or the attention of a worker can be reminded through an audible and visual alarm, but the functions of automatically eliminating the reverse current and automatically adding the string again cannot be realized.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to overcome the defects in the prior art, and provides a photovoltaic power generation elastic control device and a control method thereof, which solve the technical problem that the device cannot automatically eliminate reverse current and then automatically add the reverse current into a power generation system in the prior art.
The purpose of the invention is realized in the following way: a photovoltaic power generation elastic control device comprises
The photovoltaic power generation group serial circuits comprise a plurality of photovoltaic power generation assemblies which are connected in series;
the current sensor detects reverse current information in the photovoltaic power generation group string circuit and feeds the reverse current information back to the reverse current controller;
the automatic protector is controlled by the reverse current controller to block and isolate the photovoltaic string circuit according to the received reverse current information, and meanwhile, the isolation and blocking of the photovoltaic string circuit can be eliminated;
each photovoltaic power generation group string circuit is independently provided with a current sensor and an automatic protector.
In order to realize real-time detection of current, the high-voltage end of any photovoltaic string circuit is connected with the positive electrode of a current sensor, the negative electrode of the current sensor is connected with one end of a direct current-direct current converter, and the other end of the direct current-direct current converter is connected with the input end of an automatic protector.
In order to realize automatic elimination of reverse current in a photovoltaic power generation system, the automatic protector comprises a protection circuit, the protection circuit comprises a first control switch, the negative electrode of the first control switch is connected with the positive electrode of a second control switch, the negative electrode of the second control switch is connected with the low-voltage end of a photovoltaic power generation group string circuit, and the first control end and the second control end of the first control switch are both connected with a reverse current controller; when the first control end of the reverse current controller driving control switch I is at high voltage, the control switch I is turned on; when the second position of the control end of the first control switch is driven to be high voltage by the reverse current controller, the first control switch is turned off; the first control end and the second control end of the second control switch are connected with the reverse current controller; when the first control end of the reverse current controller driving control switch II is at high voltage, the control switch II is turned on; when the second control end of the reverse current controller driving control switch II is at high voltage, the control switch II is turned off; the other end of the direct current-direct current converter is connected with the positive electrode of the first control switch.
In order to enable the photovoltaic power generation string circuit with the reverse current eliminated to be added into the photovoltaic power generation system again, the automatic protector further comprises a self-checking circuit, the self-checking circuit comprises a control switch III, the positive electrode of the control switch III is connected with the other end of the direct current-direct current converter, the negative electrode of the control switch III is connected with one end of a self-checking resistor, the other end of the self-checking resistor is connected with the low-voltage end of the photovoltaic power generation string circuit, the control end I and the control end II of the control switch III are both connected with a reverse current controller, and when the control end I of the reverse current controller drives the control switch III to be in high voltage, the control switch III is turned on; when the second control end of the reverse current controller driving control switch III is at high voltage, the control switch III is turned off; in the design, the current sensor detects that no reverse current signal exists, the reverse current controller drives the control switch to be turned on three times, and meanwhile, when the reverse current controller detects that the self-checking circuit is turned on (which indicates that the photovoltaic power generation group string circuit has re-generated at the moment), the reverse current controller drives the control switch to be turned off two times, so that the photovoltaic power generation group string circuit is not isolated any more, and the photovoltaic power generation group string circuit is added into the photovoltaic power generation system to re-generate power.
In order to prevent the damage of the reverse current to the photovoltaic power generation assembly, the photovoltaic power generation string circuit further comprises a blocking diode, the high-voltage end of the photovoltaic power generation assembly connected in series is connected with the positive electrode of the blocking diode, and the negative electrode of the blocking diode is connected with one end of the current sensor.
In order to realize independent protection of the corresponding photovoltaic power generation group string circuits by the automatic protectors, the low-voltage ends of the photovoltaic power generation group string circuits are connected together, and the cathodes of the control switches I are connected together.
The method for controlling the photovoltaic power generation by using the photovoltaic power generation elastic control device comprises the following steps of:
(1) The direct current sensor detects the reverse current of the photovoltaic power generation string circuit in real time and sends the detected reverse current information to the reverse current controller;
(2) Judging whether a reverse current signal exists, if the reverse current signal does not exist, the reverse current controller and the automatic protector do not do any action, and the photovoltaic power generation string circuit generates power; if a reverse current signal exists in one photovoltaic power generation group string circuit, the reverse current controller controls all the first control switches to be turned off, and meanwhile, the reverse current controller drives the corresponding second control switches to be turned on, so that the photovoltaic power generation group string circuit is isolated from other photovoltaic power generation group string circuits;
(3) Returning to the step (1), detecting whether the photovoltaic power generation group string circuit with the reverse current signal still has the reverse current signal, if no reverse current signal is detected in the photovoltaic power generation group string circuit, driving the corresponding control switch I of other non-problem photovoltaic power generation group string circuits to be conducted by the reverse current controller, driving the corresponding control switch III to be conducted by the reverse current controller, and if the self-checking circuit is detected by the reverse current controller, driving the corresponding control switch II to be conducted by the reverse current controller and the corresponding control switch I to be conducted by the reverse current controller, wherein the photovoltaic power generation group string circuit is not isolated any more, and the photovoltaic power generation group string circuit automatically generates electricity again;
(4) Returning to the step (1), and circularly executing the steps.
In order to improve the photovoltaic power output, in the step (2), if no reverse current is detected, the reverse current controller detects whether a self-checking circuit is on or not, and if a certain self-checking circuit is on, the reverse current controller drives the corresponding control switch I to be on, drives the corresponding control switch III to be cut off, and simultaneously controls the corresponding control switch II to be cut off; otherwise, the reverse current controller and the automatic protector do not do any action; in the design, when the self-checking circuit is detected to be on, the reverse current appears in the previous period, the corresponding photovoltaic power generation group string circuit is still in an isolated state, the photovoltaic power generation group string circuit can normally generate power, the reverse current controller drives the control switch I to be on, the control switch II to be off and the control switch III to be off, so that the photovoltaic power generation group string circuit normally generates power, and the self-checking circuit is disconnected, thereby ensuring the photovoltaic power output to the maximum extent.
Compared with the prior art, the invention has the technical effects that: according to the invention, through the combined arrangement of the current sensor, the direct current-direct current converter, the automatic protector and the reverse current protector, the reverse current is automatically detected and automatically eliminated, the normal working state of the photovoltaic power generation system is ensured, the stability and reliability of the power generation of the photovoltaic power generation system are improved, the effective working time of the system is prolonged, and after the reverse current is eliminated, the corresponding photovoltaic power generation string current can be added into the photovoltaic power generation system again, so that the photovoltaic power energy yield is ensured to the greatest extent.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a reverse current feedback control loop according to the present invention.
Fig. 2 is a schematic circuit diagram of a photovoltaic power generation system according to the present invention.
FIG. 3 is a block diagram of a reverse current spring control flow in accordance with the present invention.
Detailed Description
The invention will be further illustrated with reference to specific examples.
An elastic control device for photovoltaic power generation as shown in fig. 1 to 3 comprises
The photovoltaic power generation group string circuits comprise at least one photovoltaic power generation assembly connected in series;
the current sensor detects reverse current information in the photovoltaic power generation group string circuit and feeds the reverse current information back to the reverse current controller;
the automatic protector is controlled by the reverse current controller to block and isolate the photovoltaic string circuit according to the received reverse current information, and meanwhile, the isolation and blocking of the photovoltaic string circuit can be eliminated;
each photovoltaic power generation group string circuit is independently provided with a current sensor and an automatic protector, and the number of the photovoltaic power generation group string circuits is at least 1.
In order to realize automatic elimination of reverse current in a photovoltaic power generation system, the automatic protector comprises a protection circuit, the protection circuit comprises a first control switch, the negative electrode of the first control switch is connected with the positive electrode of a second control switch, the negative electrode of the second control switch is connected with the low-voltage end of a photovoltaic power generation group string circuit, and the first control end and the second control end of the first control switch are both connected with a reverse current controller; when the first control end of the reverse current controller driving control switch I is at high voltage, the control switch I is turned on; when the second position of the control end of the first control switch is driven to be high voltage by the reverse current controller, the first control switch is turned off; the first control end and the second control end of the second control switch are connected with the reverse current controller; when the first control end of the reverse current controller driving control switch II is at high voltage, the control switch II is turned on; when the second control end of the reverse current controller driving control switch II is at high voltage, the control switch II is turned off; in order to realize real-time detection of current, the high-voltage end of any photovoltaic string circuit is connected with the positive electrode of a current sensor, the negative electrode of the current sensor is connected with one end of a direct current-direct current converter, and the other end of the direct current-direct current converter is connected with the positive electrode of a control switch I.
In order to enable the photovoltaic power generation string circuit with the reverse current eliminated to be added into the photovoltaic power generation system again, the automatic protector further comprises a self-checking circuit, the self-checking circuit comprises a control switch III, the positive electrode of the control switch III is connected with the other end of the direct current-direct current converter, the negative electrode of the control switch III is connected with one end of a self-checking resistor, the other end of the self-checking resistor is connected with the low-voltage end of the photovoltaic power generation string circuit, the control end I and the control end II of the control switch III are both connected with a reverse current controller, and when the control end I of the reverse current controller drives the control switch III to be in high voltage, the control switch III is turned on; when the second control end of the reverse current controller driving control switch III is at high voltage, the control switch III is turned off.
In order to prevent the damage of the reverse current to the photovoltaic power generation assembly, the photovoltaic power generation string circuit further comprises a blocking diode, the high-voltage end of the photovoltaic power generation assembly connected in series is connected with the positive electrode of the blocking diode, and the negative electrode of the blocking diode is connected with one end of the current sensor.
In order to realize independent protection of the corresponding photovoltaic power generation group string circuits by the automatic protectors, the low-voltage ends of the photovoltaic power generation group string circuits are connected together, and the cathodes of the control switches I are connected together.
The photovoltaic power generation system has the specific structure that a negative electrode of a first control switch is connected with one end of a direct-current end combiner box capacitor and one end of an inverter, a low-voltage end of a photovoltaic power generation group string circuit is connected with the other end of the direct-current end combiner box capacitor and the other end of the inverter, and the inverter feeds electric energy to an alternating-current end to supply power for an alternating-current power grid; in addition, the reverse current controller can be a singlechip.
A method for controlling photovoltaic power generation using a photovoltaic power generation elastic control apparatus (as shown in fig. 3), comprising the steps of:
(1) The direct current sensor detects the reverse current of the photovoltaic power generation string circuit in real time and sends the detected reverse current information to the reverse current controller;
(2) Judging whether a reverse current signal exists, if the reverse current signal exists, detecting whether a self-checking circuit is on or not by a reverse current controller, and if the self-checking circuit is on, driving a corresponding control switch I to be on, driving a corresponding control switch III to be off and controlling a corresponding control switch II to be off by the reverse current controller; otherwise, the reverse current controller and the automatic protector do not do any action, and the photovoltaic power generation group string circuit generates power; if a reverse current signal exists in one photovoltaic power generation group string circuit, the reverse current controller controls all the first control switches to be turned off, and meanwhile, the reverse current controller drives the corresponding second control switches to be turned on, so that the photovoltaic power generation group string circuit is isolated from other photovoltaic power generation group string circuits;
(3) Returning to the step (1), detecting whether the photovoltaic power generation group string circuit with the reverse current signal still has the reverse current signal, if no reverse current signal is detected in the photovoltaic power generation group string circuit, driving the corresponding control switch I of other non-problem photovoltaic power generation group string circuits to be conducted by the reverse current controller, driving the corresponding control switch III to be conducted by the reverse current controller, and if the self-checking circuit is detected by the reverse current controller, driving the corresponding control switch II to be conducted by the reverse current controller and the corresponding control switch I to be conducted by the reverse current controller, wherein the photovoltaic power generation group string circuit is not isolated any more, and the photovoltaic power generation group string circuit automatically generates electricity again;
(4) Returning to the step (1), and circularly executing the steps.
In the following, as shown in fig. 2, n photovoltaic power generation group string circuits are provided in the photovoltaic power generation system, a reverse current is generated in a first photovoltaic power generation group string circuit, no reverse current is generated in other photovoltaic power generation group string circuits, a reverse current controller drives a control switch to be turned off, so that all the photovoltaic power generation group string circuits are temporarily suspended, a reverse current controller drives a control switch corresponding to the first photovoltaic power generation group string circuit to be turned on, the first photovoltaic power generation group string circuit is isolated from other group string circuits, when a current sensor displays that the reverse current is lost, the reverse current controller conducts a control switch corresponding to the other photovoltaic power generation group string circuits to continuously generate and charge a capacitor of a current terminal combiner box so as to maintain normal operation of the photovoltaic power generation system, meanwhile, drives a control switch corresponding to the first photovoltaic power generation group string circuit to be turned on, the photovoltaic power generation group string circuits are in an isolated state, if the photovoltaic power generation group string circuits are in an isolated state, maintenance is waited, or if the protection is eliminated, the photovoltaic power generation group string circuits are automatically reset, and the current sensor is connected with the photovoltaic power generation group string circuits to continuously perform a current monitoring cycle; in addition, at the beginning of each execution period, if no reverse current is detected, the reverse current elastic controller detects whether a self-checking circuit of a certain photovoltaic group string is on or not, if the self-checking circuit is on, the group string is still in an isolated state and is eliminated by fault, so that a forward power generation current signal can be detected through the self-checking circuit, and under the condition, the reverse current elastic controller conducts the automatic protector control switch I to conduct the group string to be integrated into the power generation circuit and simultaneously turns off the protector control switch III to turn off the self-checking circuit.
According to the invention, through the combined arrangement of the current sensor, the direct current-direct current converter, the automatic protector and the reverse current protector, the reverse current is automatically detected and automatically eliminated, the normal working state of the photovoltaic power generation system is ensured, the stability and reliability of the power generation of the photovoltaic power generation system are improved, the effective working time of the system is prolonged, and after the reverse current is eliminated, the corresponding photovoltaic power generation string current can be added into the photovoltaic power generation system again, so that the photovoltaic power energy yield is ensured to the greatest extent.
The invention is not limited to the above embodiments, and based on the technical solution disclosed in the invention, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the invention.
Claims (4)
1. A method for controlling photovoltaic power generation using a photovoltaic power generation elastic control device, comprising the steps of:
(1) The direct current sensor detects the reverse current of the photovoltaic power generation string circuit in real time and sends the detected reverse current information to the reverse current controller;
(2) Judging whether a reverse current signal exists, if the reverse current signal does not exist, the reverse current controller and the automatic protector do not do any action, and the photovoltaic power generation string circuit generates power; if a reverse current signal exists in one photovoltaic power generation group string circuit, the reverse current controller controls all the first control switches to be turned off, and meanwhile, the reverse current controller drives the corresponding second control switches to be turned on, so that the photovoltaic power generation group string circuit is isolated from other photovoltaic power generation group string circuits;
(3) Returning to the step (1), detecting whether the photovoltaic power generation group string circuit with the reverse current signal still has the reverse current signal, if no reverse current signal is detected in the photovoltaic power generation group string circuit, driving the corresponding control switch I of other non-problem photovoltaic power generation group string circuits to be conducted by the reverse current controller, driving the corresponding control switch III to be conducted by the reverse current controller, and if the self-checking circuit is detected by the reverse current controller, driving the corresponding control switch II to be conducted by the reverse current controller and the corresponding control switch I to be conducted by the reverse current controller, wherein the photovoltaic power generation group string circuit is not isolated any more, and the photovoltaic power generation group string circuit automatically generates electricity again;
(4) Returning to the step (1), and circularly executing the steps;
wherein the photovoltaic power generation elastic control device comprises a plurality of photovoltaic power generation group string circuits, the photovoltaic power generation group string circuits comprise a plurality of photovoltaic power generation components which are connected in series, and the device is characterized in that,
the photovoltaic power generation system comprises a current sensor, wherein the current sensor detects reverse current information in a photovoltaic power generation group string circuit and feeds back the reverse current information to a reverse current controller;
the automatic protector is controlled by the reverse current controller to block and isolate the photovoltaic string circuit according to the received reverse current information, and meanwhile, the isolation and blocking of the photovoltaic string circuit can be eliminated;
each photovoltaic power generation group string circuit is independently provided with a current sensor and an automatic protector; the high-voltage end of any photovoltaic string circuit is connected with the positive electrode of a current sensor, the negative electrode of the current sensor is connected with one end of a direct current-direct current converter, the other end of the direct current-direct current converter is connected with the input end of an automatic protector, the automatic protector comprises a protection circuit and a self-checking circuit, the protection circuit comprises a first control switch, the negative electrode of the first control switch is connected with the positive electrode of a second control switch, the negative electrode of the second control switch is connected with the low-voltage end of the photovoltaic string circuit, and the first control end and the second control end of the first control switch are both connected with a reverse current controller; when the first control end of the reverse current controller driving control switch I is at high voltage, the control switch I is turned on; when the second position of the control end of the first control switch is driven to be high voltage by the reverse current controller, the first control switch is turned off; the first control end and the second control end of the second control switch are connected with the reverse current controller; when the first control end of the reverse current controller driving control switch II is at high voltage, the control switch II is turned on; when the second control end of the reverse current controller driving control switch II is at high voltage, the control switch II is turned off; the other end of the direct current-direct current converter is connected with the positive electrode of the first control switch;
the self-checking circuit comprises a control switch III, the positive electrode of the control switch III is connected with the other end of the direct current-direct current converter, the negative electrode of the control switch III is connected with one end of a self-checking resistor, the other end of the self-checking resistor is connected with the low-voltage end of the photovoltaic power generation group string circuit, the control end I and the control end II of the control switch III are both connected with an inverted current controller, and when the control end I of the inverted current controller drives the control switch III to be at high voltage, the control switch III is turned on; when the second control end of the reverse current controller driving control switch III is at high voltage, the control switch III is turned off.
2. The control method according to claim 1, wherein the photovoltaic power generation string circuit further comprises a blocking diode, the high voltage end of the photovoltaic power generation assembly connected in series is connected with the positive electrode of the blocking diode, and the negative electrode of the blocking diode is connected with one end of the current sensor.
3. The control method according to claim 1, wherein the low voltage terminals of the photovoltaic power generation string circuits are connected together, and the cathodes of the control switches are connected together.
4. A control method according to any one of claims 1 to 3, wherein in the step (2), if no reverse current is detected, the reverse current controller detects whether the self-checking circuit is on or not, and if a certain self-checking circuit is on, the reverse current controller drives the corresponding control switch one to be turned on, drives the corresponding control switch three to be turned off, and simultaneously controls the corresponding control switch two to be turned off; otherwise, the reverse current controller and the automatic protector do no action.
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| WO2015061349A1 (en) * | 2013-10-22 | 2015-04-30 | Advanced Energy Industries, Inc. | Photovoltaic dc sub-array control system and method |
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