CN115632389B - Shutoff device, control method thereof and photovoltaic power generation system - Google Patents
Shutoff device, control method thereof and photovoltaic power generation system Download PDFInfo
- Publication number
- CN115632389B CN115632389B CN202211651944.6A CN202211651944A CN115632389B CN 115632389 B CN115632389 B CN 115632389B CN 202211651944 A CN202211651944 A CN 202211651944A CN 115632389 B CN115632389 B CN 115632389B
- Authority
- CN
- China
- Prior art keywords
- module
- power supply
- shutdown
- turn
- control module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000010248 power generation Methods 0.000 title claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 10
- 239000003381 stabilizer Substances 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 3
- 206010014357 Electric shock Diseases 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Images
Classifications
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- 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
-
- 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
Abstract
The application relates to the field of photovoltaic power generation, in particular to a breaker, a control method thereof and a photovoltaic power generation system, wherein the breaker comprises: the first turn-off module is used for controlling the connection between the first photovoltaic direct-current power supply and the power bus; the control module is connected with the first turn-off module and is used for controlling the first turn-off module; the auxiliary power supply module is connected with the control module and used for getting power from the first photovoltaic direct-current power supply and supplying power to the control module; the control module is further configured to detect a power supply supporting capability of the auxiliary power supply module, and control the first turn-off module to turn off to disconnect the connection between the first photovoltaic dc power supply and the power bus when the power supply supporting capability of the auxiliary power supply module is lower than a corresponding supporting capability threshold. The invention prevents the control module from power failure, thereby avoiding the influence on the normal operation of the turn-off device caused by frequent turn-on and turn-off of the auxiliary power supply module and the control module.
Description
Technical Field
The application relates to the field of photovoltaic power generation, in particular to a shutoff device, a control method of the shutoff device and a photovoltaic power generation system.
Background
At present, a string type photovoltaic power generation system is widely applied to the field of photovoltaic power generation, the direct-current high voltage of the string type photovoltaic power generation system can bring the danger of arcing and electric shock, and when a fire disaster occurs in the photovoltaic power generation system, great potential safety hazards are brought to fire extinguishing operation of a fireman. The existing solution is to configure a component-level fast turn-off device for each photovoltaic dc power supply, for example, a turn-off device, and when abnormal conditions such as fire occur, the output of each photovoltaic dc power supply is cut off by the turn-off device, so as to reduce the output voltage of the photovoltaic dc power supply, thereby reducing the risk of electric shock of fire fighting and operation and maintenance personnel.
For a shutdown device, in the prior art, generally, power is taken from a photovoltaic direct-current power supply connected with the shutdown device to supply power to a controller and a driver, in a normal operation process, when the photovoltaic direct-current power supply is abnormal, for example, under working conditions that the photovoltaic direct-current power supply is shielded by shadows, dust, large attenuation and the like, output current of the photovoltaic direct-current power supply is smaller than power bus current, output voltage of the photovoltaic direct-current power supply is continuously pulled down by the power bus current until an auxiliary power supply module stops working after power failure, the controller resets, a switching tube connected between the photovoltaic direct-current power supply and the power bus inside the shutdown device is disconnected, output voltage of the photovoltaic direct-current power supply rapidly rises, and when the output voltage of the photovoltaic direct-current power supply is higher than starting voltage of the auxiliary power supply module, the auxiliary power supply module and the controller restart is performed, so that the auxiliary power supply module and the controller are in a frequent on-off state, and normal operation of the shutdown device is affected.
Disclosure of Invention
In view of the above, it is necessary to provide a shutdown device, a control method thereof, and a photovoltaic power generation system.
In a first aspect, an embodiment of the present invention provides a shutdown device, where the shutdown device includes:
the first turn-off module is used for controlling connection between the first photovoltaic direct-current power supply and the power bus;
the control module is connected with the first turn-off module and used for controlling the first turn-off module;
the auxiliary power supply module is connected with the control module and used for getting power from the first photovoltaic direct-current power supply and supplying power to the control module;
the control module is further configured to detect a power supply supporting capability of the auxiliary power supply module, and when the power supply supporting capability of the auxiliary power supply module is lower than a supporting capability threshold, control the first turn-off module to turn off to disconnect the connection between the first photovoltaic direct-current power supply and the power bus.
In an embodiment, the control module obtains a voltage signal representing the power supply supporting capability of the auxiliary power supply module, and controls the first shutdown module to be turned off when the voltage signal is lower than a corresponding voltage threshold.
In an embodiment, in a starting process of the shutdown device, the control module obtains an input voltage of the first shutdown module representing a power supply supporting capability of the auxiliary power supply module, and when the input voltage is lower than a corresponding voltage threshold, after a first preset time elapses, if the input voltage is still lower than the corresponding voltage threshold, the control module controls the first shutdown module to be turned off.
In an embodiment, in a restarting process of the first shutdown module, the control module closes the first shutdown module after controlling the first shutdown module to be disconnected for a second preset time, and after closing the first shutdown module for a third preset time, if a voltage signal representing power supply supporting capability of the auxiliary power supply module is not lower than a corresponding voltage threshold, the restarting is successful, the first shutdown module is controlled to keep a normally closed state, and if the voltage signal is lower than the corresponding voltage threshold, the restarting is failed, and the first shutdown module is controlled to be disconnected.
In an embodiment, if the number of restart failures is greater than a threshold, the control module controls the first shutdown module to turn off for a fourth preset time, and then restart the first shutdown module again, where the fourth preset time is greater than the second preset time.
In one embodiment, the first shutdown module includes:
at least one first switching tube connected between the first photovoltaic direct current power source and the power bus;
and the follow current pipe is connected to the output end of the first turn-off module and is used for providing a follow current channel.
In an embodiment, when the follow current tube is a switching tube, if the number of times of restart failure of the first turn-off module is greater than a threshold of times, the control module controls the follow current tube to be turned on within a fourth preset time.
In one embodiment, the auxiliary power module includes:
the supporting unit is used for getting electricity from the first photovoltaic direct-current power supply and providing supporting voltage;
and the power supply unit is used for converting the supporting voltage to generate a power supply voltage provided for the control module.
In one embodiment, the control module comprises:
the detection unit is used for acquiring a voltage signal representing power supply supporting capacity; the voltage signal is an input voltage of the first turn-off module or the support voltage or a supply voltage;
and the control unit is used for controlling the first turn-off module to be turned off when the voltage signal is lower than the corresponding voltage threshold.
In one embodiment, the supporting unit includes:
and the supporting capacitor is connected with the power supply unit in parallel.
In one embodiment, the auxiliary power supply module further includes:
and the voltage stabilizer is connected to the input end of the supporting unit and is used for reducing or stabilizing the input voltage of the power supply unit.
In an embodiment, the shutdown device further comprises:
the first turn-off module is connected between the first photovoltaic direct-current power supply and the power bus, and is used for controlling connection between the first photovoltaic direct-current power supply and the power bus; the second turn-off module is connected with the control module, and the control module is also used for controlling the second turn-off module;
when the power supply supporting capacity is lower than a supporting capacity threshold value, the control module controls the first turn-off module to disconnect the connection between the first photovoltaic direct-current power supply and the power bus and controls the second turn-off module to keep working normally.
In a second aspect, an embodiment of the present invention provides a method for controlling a shutdown device, where the shutdown device includes a first shutdown module configured to control connection between a first photovoltaic dc power source and a power bus, a control module connected to the first shutdown module, and an auxiliary power supply module connected to the control module, where the method includes:
the control module detects the power supply supporting capacity of the auxiliary power supply module;
when the power supply supporting capacity of the auxiliary power supply module is lower than a supporting capacity threshold value, the control module controls the first turn-off module to be disconnected so as to disconnect the first photovoltaic direct-current power supply from the power bus.
In an embodiment, the control module obtains a voltage signal representing the power supply supporting capability of the auxiliary power supply module, and controls the first shutdown module to be turned off when the voltage signal is lower than a corresponding voltage threshold.
In an embodiment, in a starting process of the shutdown device, the control module obtains an input voltage of a first shutdown module representing a power supply supporting capability of the auxiliary power supply module, and when the input voltage is lower than a corresponding voltage threshold, after a first preset time elapses, if the input voltage is still lower than the corresponding voltage threshold, the first shutdown module is controlled to be turned off.
In an embodiment, in a restarting process of the first shutdown module, the control module closes the first shutdown module after controlling the first shutdown module to be disconnected for a second preset time, and after closing the first shutdown module for a third preset time, if the voltage signal is not lower than a corresponding voltage threshold, the restarting is successful, the first shutdown module is controlled to keep a normally-closed state, and if the voltage signal representing the power supply supporting capability of the auxiliary power supply module is lower than the corresponding voltage threshold, the restarting is failed, and the first shutdown module is controlled to be disconnected.
In an embodiment, if the number of restart failures is greater than a threshold, the control module controls the first shutdown module to turn off for a fourth preset time, and then restart the first shutdown module again, where the fourth preset time is greater than the second preset time.
In one embodiment, the first turn-off module comprises a follow current pipe connected to the output end of the first turn-off module for providing a follow current channel;
when the follow current tube is a switch tube, if the restart failure frequency of the first turn-off module is greater than the frequency threshold, the control module controls the follow current tube to be conducted within a fourth preset time.
In an embodiment, the shutdown device further includes at least one second shutdown module connected between a corresponding second photovoltaic dc power source and the power bus, and configured to control connection between the corresponding second photovoltaic dc power source and the power bus, where output ends of the first and second shutdown modules are connected, and the control module is connected to the second shutdown module;
and when the power supply supporting capacity is lower than a supporting capacity threshold value, the control module controls the first turn-off module to disconnect the connection between the first photovoltaic direct-current power supply and the power bus and controls the second turn-off module to keep working normally.
In a third aspect, an embodiment of the present invention provides a photovoltaic power generation system, including at least one photovoltaic dc power source and at least one shutdown device according to the first aspect, where an output end of the photovoltaic dc power source is connected to a power bus through the shutdown device.
Compared with the prior art, through detecting the power supply supporting capacity of the auxiliary power supply module, when the power supply supporting capacity of the auxiliary power supply module is lower than the supporting capacity threshold value, the first turn-off module is controlled to be disconnected so as to disconnect the connection between the first photovoltaic direct-current power supply and the power bus, so that the control module is prevented from power failure, and the auxiliary power supply module and the control module are prevented from being frequently turned on and turned off to influence the normal operation of the turn-off device.
Drawings
Fig. 1 is a schematic structural diagram of a shutdown device in an embodiment provided in the present application;
FIG. 2 is a schematic structural diagram of an auxiliary power module and a control module according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a shutoff device according to a first embodiment of the disclosure;
fig. 4 is a schematic structural diagram of a shutdown device in another embodiment provided in the present application;
FIG. 5 is a schematic structural diagram of a shutoff device according to a second embodiment of the present application;
fig. 6 is a schematic structural diagram of a shutdown device according to a third embodiment of the present application;
fig. 7 is a schematic flowchart illustrating a method for controlling a shutdown device according to an embodiment of the present disclosure;
fig. 8 is a schematic diagram of a signal waveform of a shutdown device in a first exemplary embodiment provided in the present application;
fig. 9 is a schematic diagram of a signal waveform of a shutdown device in a second exemplary embodiment provided in the present application;
fig. 10 is a schematic diagram of a signal waveform of a shutdown device in a third exemplary embodiment provided in the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention (including a single reference) are to be construed in a non-limiting sense as indicating either the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to only those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but rather can include electrical connections, whether direct or indirect. Reference herein to "a plurality" means greater than or equal to two. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, "a and/or B" may indicate: a exists alone, A and B exist simultaneously, and B exists alone. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
As shown in fig. 1, an embodiment of the present invention provides a shutdown device, as shown in fig. 1, the shutdown device includes: a first shutdown module 100 connected between the first photovoltaic direct current power source PV1 and the power bus for controlling the connection between the first photovoltaic direct current power source PV1 and the power bus; the control module 200 is connected to the first shutdown module 100 and configured to control the first shutdown module 100; the auxiliary power supply module 300 is connected with the control module 200 and used for getting power from the first photovoltaic direct current power supply PV1 and supplying power to the control module 200; the control module 200 is further configured to detect a power supply supporting capability of the auxiliary power supply module 300, and control the first shutdown module 100 to disconnect the first photovoltaic direct-current power source PV1 from the power bus when the power supply supporting capability of the auxiliary power supply module 300 is lower than a supporting capability threshold.
The first photovoltaic direct current power source PV1 may be a single photovoltaic module, a plurality of photovoltaic modules connected in series/parallel, a plurality of photovoltaic cell sub-strings connected in series/parallel.
The power supply supporting capability being lower than the supporting capability threshold refers to, for example, that the voltage signal representing the power supply supporting capability of the auxiliary power supply module is lower than the corresponding voltage threshold, or that the voltage signal representing the power supply supporting capability of the auxiliary power supply module is lower than the corresponding voltage threshold and the voltage signal after a period of time is still lower than the corresponding voltage threshold, but is not limited thereto.
In the application, the step of controlling the first turn-off module to be disconnected refers to disconnecting the connection between the first photovoltaic direct-current power supply and the power bus which are correspondingly connected, the step of controlling the first turn-off module to be closed or in the normally closed state refers to the step of connecting the connection between the first photovoltaic direct-current power supply and the power bus, and the first photovoltaic direct-current power supply outputs normal power.
In this embodiment, the control module detects the power supply supporting capability of the auxiliary power supply module, and when the power supply supporting capability of the auxiliary power supply module is lower than a supporting capability threshold, the control module controls the first turn-off module to turn off to disconnect the connection between the first photovoltaic direct-current power supply and the power bus, so as to prevent the control module from power down. The problem of when first photovoltaic direct current power supply is unusual, for example receive operating mode such as shade sheltered from, the dust shelters from, the decay is great at first photovoltaic direct current power supply, the power supply module is assisted with the frequent switching on and shutting down of control module, and influences the normal operating of shutoff device is solved.
During the normal operation of the shutdown device, the control module 200 obtains a voltage signal for characterizing the power supply supporting capability of the auxiliary power supply module 300, and controls the first shutdown module 100 to be turned off when the voltage signal is lower than a corresponding voltage threshold, where the voltage threshold corresponds to the supporting capability threshold of the auxiliary power supply module.
In the normal working process of the shutdown device, when the first photovoltaic direct-current power supply PV1 for supplying power to the auxiliary power supply module 300 is abnormal, that is, the voltage signal is lower than the corresponding voltage threshold, the first shutdown module 100 is controlled to be disconnected, so that the auxiliary power supply module 300 cannot be broken down, the control module 200 does not have the power failure problem, and the normal work of the shutdown device cannot be influenced.
In the starting process of the shutdown device, for example, in the early and late low light starting, because the power provided by the first photovoltaic direct-current power supply is relatively low, the direct closing of the first shutdown module can instantly lower the output voltage of the first photovoltaic direct-current power supply (the input voltage of the first shutdown module), when the output voltage of the first photovoltaic direct-current power supply is lower than the operating voltage lower limit of the corresponding auxiliary power supply module, the auxiliary power supply module stops working, so that the control module is powered down, when the output voltage of the first photovoltaic direct-current power supply is higher than the starting threshold of the auxiliary power supply module, the auxiliary power supply module starts working again, the control module is powered on and restarted, the first shutdown module is closed again, the starting can be successful after repeated times, and the repeated restarting affects the service life of the device, and reduces the reliability.
To solve the above technical problem, during the startup of the shutdown device, the control module 200 obtains a voltage signal representing the power supply supporting capability of the auxiliary power supply module 300, for example, the input voltage of the first shutdown module. When the voltage signal is lower than the corresponding voltage threshold, after a first preset time, if the voltage signal is still lower than the corresponding voltage threshold, the first shutdown module 100 is controlled to be disconnected, so that repeated restarting of an auxiliary power supply module and a control module is avoided, and the reliability of a shutdown device is improved, wherein the voltage threshold and the first preset time correspond to a support capacity threshold of the auxiliary power supply module.
Further, in a restarting process of the first shutdown module, that is, from an open state to a closed state, the control module 200 closes the first shutdown module after controlling the first shutdown module 100 to be disconnected for a second preset time, and after the first shutdown module 100 is closed for a third preset time, if the voltage signal is not lower than the corresponding voltage threshold, the first shutdown module 100 is controlled to be in a normally closed state, and if the voltage signal is lower than the corresponding voltage threshold, the restarting fails, and the first shutdown module 100 is controlled to be disconnected.
Based on the control strategy, in the restarting process of the shutdown module, the frequent restarting is avoided by setting the second preset time to effectively control the restarting frequency of the shutdown module. And the success of restarting the shutdown module is ensured by setting the third preset time.
Further, if the number of times of restart failure is greater than the number threshold, the control module controls the first shutdown module to restart again after disconnecting for a fourth preset time, where the fourth preset time is greater than the second preset time.
Based on the control strategy, in the restarting process of the shutdown module, the frequency of restarting the shutdown module is effectively controlled by setting the fourth preset time, so that frequent restarting is avoided.
In one embodiment, as shown in fig. 2, the auxiliary power module 300 includes: the supporting unit 310 is configured to take power from the first photovoltaic dc power source PV1 and output a supporting voltage V1. The power supply unit 320 is configured to convert the support voltage V1 to generate a supply voltage.
When the first photovoltaic dc power PV1 is abnormal, the supporting unit 310 may prevent the input voltage of the power supply unit 320 from being pulled down instantaneously, and continue to provide a stable supporting voltage to the power supply unit 320 to keep the control module 200 from power down.
According to the requirement of the control module, the power supply unit can convert the supporting voltage to generate a plurality of power supply voltages with different voltage values.
The control module 200 includes: the detection unit 220 is configured to obtain a voltage signal representing power supply support capability; the control unit 210 is configured to control the first shutdown module 100 connected to the auxiliary power supply module 300 to be turned off when the voltage signal is lower than a corresponding voltage threshold, and the first photovoltaic direct current power supply PV1 is only used for supplying power to the auxiliary power supply module 300 to prevent the control module 200 from powering down.
Wherein the first turn-off module 100 comprises at least one first switching tube connected between the first photovoltaic direct current power source PV1 and the power bus.
Specifically, in an embodiment, the voltage signal representing the power supply supporting capability is a supporting voltage V1 output by the supporting unit 310. The detection unit 220 is configured to obtain a support voltage V1, when the support voltage V1 is lower than a corresponding first voltage threshold, the control unit 210 determines that the support capability of the auxiliary power supply module 300 is insufficient, and if the first switching tube between the first photovoltaic dc power supply PV1 and the power bus is continuously closed, the control module 200 is powered down, so that to avoid the power down of the control module 200, the first switching tube between the first photovoltaic dc power supply PV1 and the power bus needs to be disconnected, and at this time, the first photovoltaic dc power supply PV1 is only used to supply power to the auxiliary power supply module 300 to prevent the power down of the control module 200.
In another embodiment, the voltage signal characterizing the power supply support capability is the input voltage Vin of the first shutdown module 100. The detection unit 220 obtains the input voltage Vin of the first shutdown module 100, and during operation, when the input voltage Vin is lower than the corresponding second voltage threshold, the control unit 210 determines that the supporting capability of the auxiliary power supply module 300 is insufficient, and if the first switching tube between the first photovoltaic direct-current power supply PV1 and the power bus is continuously closed, the control module 200 is powered down, so that to avoid the power down of the control module 200, the first switching tube between the first photovoltaic direct-current power supply PV1 and the power bus needs to be disconnected, and at this time, the first photovoltaic direct-current power supply PV1 is only used for supplying power to the auxiliary power supply module 300 to prevent the power down of the control module 200.
In a further embodiment, the voltage signal representing the power supply supporting capability is a power supply voltage V4 output by the power supply unit 320 to the control module 200, and the power supply voltage V4 supplies power to a driving unit in the control module, for example. The detection unit 220 obtains a power supply voltage V4, when the power supply voltage V4 is lower than a corresponding third voltage threshold, the control unit 210 determines that the supporting capability of the auxiliary power supply module 300 is insufficient, and if the first switching tube between the photovoltaic direct-current power supply and the power bus is continuously closed, the power failure of the control module 200 is caused, so that in order to avoid the power failure of the control module 200, the switching tube between the first photovoltaic direct-current power supply PV1 and the power bus needs to be disconnected, and at this time, the first photovoltaic direct-current power supply PV1 is only used for supplying power to the auxiliary power supply module to prevent the power failure of the control module 200.
Fig. 3 is a schematic structural diagram of the shutdown device according to the first embodiment of the present invention, as shown in fig. 3, the control unit 210 includes a controller 211 and a driving unit 212, the detecting unit 220 is configured to obtain a voltage signal representing a power supply supporting capability of the auxiliary power supply module, the controller 211 compares the voltage signal with a corresponding voltage threshold, determines the power supply supporting capability of the auxiliary power supply module 300, generates a control signal according to a comparison result, and the driving unit 212 generates a driving signal Vgs according to the control signal, for driving the first switching tube S11 in the first shutdown module 100.
The power supply unit 320 includes a first DC/DC conversion unit 321 and a second DC/DC conversion unit 322, the first DC/DC conversion unit 321 is configured to generate a power supply voltage V4 according to the support voltage V1 provided by the support unit 310 for supplying power to the driving unit 212, the second DC/DC conversion unit 322 generates a power supply voltage V3 according to the power supply voltage V4 for supplying power to the controller 211, the power supply voltage V4 is greater than the power supply voltage V3, the power supply voltage V4 is, for example, 12V, and the power supply voltage V3 is, for example, 3.3V.
The first DC/DC converting unit 321 and the second DC/DC converting unit 322 may be voltage-reducing circuits, for example, buck circuits.
Further, the auxiliary power supply module 300 further includes a voltage stabilizer 330 connected to an input terminal of the supporting unit 310, for reducing or stabilizing an input voltage of the power supply unit 320.
The voltage regulator 330 may be a low dropout linear regulator LDO that can support a wide range of input voltages for the first shutdown module, e.g., 8-80V for the first shutdown module 100.
The supporting unit 310 includes a supporting capacitor connected in parallel with the power supply unit 320, and the power supply supporting capability of the auxiliary power supply module 300 is related to the capacitance value of the supporting capacitor, and the larger the capacitance value is, the stronger the power supply supporting capability is.
The first shutdown module 100 further includes a follow current tube D11 connected to the output end of the photovoltaic dc power supply.
The first switch tube can be arranged in plurality according to requirements.
The follow current tube D11 may be a diode, a switching tube (e.g., a MOSFET, etc.), or a combination thereof.
Further, the first turn-off module 100 further includes an input capacitor Cin1 and an output capacitor Cout1, which are respectively connected in parallel to the input end and the output end of the first turn-off module 100 for voltage stabilization. The voltage across the input capacitor Cin1 is the input voltage Vin of the first turn-off module, and the voltage across the output capacitor Cout1 is the output voltage Vout of the turn-off device.
Further, the auxiliary power supply module 300 further includes a backflow prevention diode D12 for preventing the auxiliary power supply module 300 from supplying power to the shutdown device in a reverse direction.
Further, the supporting unit 310 may be disposed at an input terminal of the voltage stabilizer 330 or between the first DC/DC converting unit 321 and the second DC/DC converting unit 322.
In an embodiment, as shown in fig. 4, compared to the embodiment shown in fig. 1, the shutdown device further includes a second shutdown module 400 connected between the second photovoltaic dc power source PV2 and the power bus, and when the power supply support capability is lower than the corresponding support capability threshold, the first shutdown module is controlled to be disconnected to disconnect the corresponding first photovoltaic dc power source PV1 from the power bus, so as to prevent the control module from being powered down, and meanwhile, the second shutdown module is controlled to keep normal operation.
When the first photovoltaic dc power PV1 supplying power to the auxiliary power supply module 300 is in an abnormal or weak light state, the first turn-off module 100 is controlled to be turned off, and the normal operation of other photovoltaic dc power supplies is not affected.
It is understood that the shutdown device may further include more than two second shutdown modules, and the structures thereof are substantially the same, and thus, the detailed description thereof is omitted.
Fig. 5 is a schematic structural diagram of a shutdown device according to a second embodiment of the present invention, and as shown in fig. 5, based on the first embodiment, the shutdown device further includes a second shutdown module 400 connected between the photovoltaic dc power source PV2 and the power bus. The second turn-off module 400 has the same structure as the first turn-off module 100, and includes a second switching tube S21, a follow current tube D21, a capacitor Cin2, and a capacitor Cout2.
The control module 200 provides a driving signal Vgs2 to control the second switching tube S21 to be turned on or off, and the auxiliary power supply module 300 obtains power from the first photovoltaic dc power source connected to the input end of the first turn-off module 100.
In some embodiments, the first switch tube S11 may be disposed between a high potential input terminal and a high potential output terminal of the first turn-off module 100, or between a low potential input terminal and a low potential output terminal of the first turn-off module 100, and the second switch tube S21 may be disposed between a high potential input terminal and a high potential output terminal of the second turn-off module 400, or between a low potential input terminal and a low potential output terminal of the second turn-off module 400.
Fig. 6 is a schematic structural diagram of a shutoff device according to a third embodiment of the present invention, and as shown in fig. 6, the difference from the first embodiment is that the follow current tube D11 is a switch tube.
In this embodiment, if the number of times of restart failure of the first turn-off module is greater than the number threshold, the control module 200 controls the freewheeling tube D11 to be turned on within a fourth preset time to provide a freewheeling channel, so as to solve the problem that in the prior art, the freewheeling tube D11 cannot be continuously turned on because of frequent restart, so that a power bus current flows through a freewheeling diode therein, and the shutdown device is heated seriously, thereby affecting the operational reliability thereof.
Other structures of the shutoff device are the same as those of the second embodiment, and therefore, the description thereof is omitted.
Based on the above hardware embodiment, an embodiment of the present invention further provides a method for controlling a shutdown device, as shown in fig. 7, where the method includes:
s701: detecting the power supply supporting capacity of the auxiliary power supply module;
s702: when the power supply supporting capacity of the auxiliary power supply module is lower than a supporting capacity threshold value, the control module controls the first turn-off module to disconnect the connection between the first photovoltaic direct-current power supply and the power bus.
In this embodiment, by detecting the power supply supporting capability of the auxiliary power supply module, when the power supply supporting capability of the auxiliary power supply module is lower than the supporting capability threshold, the first turn-off module is controlled to be turned off to disconnect the connection between the first photovoltaic direct-current power supply and the power bus, so as to prevent the control module from being powered down, thereby preventing the auxiliary power supply module and the control module from being frequently turned on and off to influence the normal operation of the turn-off device.
In an embodiment, during a normal operation of the shutdown device, the control module obtains a voltage signal for characterizing a power supply supporting capability of the auxiliary power supply module, and controls the first shutdown module to be turned off when the voltage signal is lower than a corresponding voltage threshold.
In an embodiment, in a starting process of the shutdown device, the control module obtains an input voltage of the first shutdown module, and when the input voltage is lower than a corresponding voltage threshold, after a first preset time elapses, if the input voltage is still lower than the corresponding voltage threshold, the control module controls the first shutdown module to be turned off.
In an embodiment, in a restarting process of the first shutdown module, the control module closes the first shutdown module after controlling the first shutdown module to be disconnected for a second preset time, and after closing the first shutdown module for a third preset time, if the voltage signal is not lower than a corresponding voltage threshold, the restarting is successful, the first shutdown module is controlled to keep a normally-closed state, and if the voltage signal is lower than the corresponding voltage threshold, the restarting is failed, and the first shutdown module is controlled to be disconnected.
In an embodiment, if the number of restart failures is greater than a threshold, the control module controls the first shutdown module to turn off for a fourth preset time, and then restart the first shutdown module again, where the fourth preset time is greater than the second preset time.
In an embodiment, when the freewheeling tube included in the first turn-off module is a switching tube, if the number of times of restart failure of the first turn-off module is greater than the number threshold, the control module controls the freewheeling tube to be turned on within a fourth preset time.
In an embodiment, the shutdown device further includes at least one second shutdown module connected between a second photovoltaic dc power source and the power bus, and configured to control connection between the second photovoltaic dc power source and the power bus, where output terminals of the first and second shutdown modules are connected, and the control module is connected to the second shutdown module;
when the power supply supporting capacity is lower than a supporting capacity threshold value, the control module controls the first turn-off module to disconnect the connection between the first photovoltaic direct-current power supply and the power bus and controls the second turn-off module to keep working normally.
For specific limitations of the control method of the shutdown device, reference may be made to the above limitations of the shutdown device, and details thereof are not repeated here.
In the first exemplary embodiment, a control method of the shutdown device is explained by taking the example in which the detection unit 220 acquires the support voltage V1.
With reference to fig. 3 and 8, during the operation of the shutdown device, at time t0, the first photovoltaic dc power supply PV1 is abnormal, for example, is shielded, so that the output power of the first photovoltaic dc power supply PV1 decreases, the output voltage of the first photovoltaic dc power supply PV1 starts to decrease, the control module 200 at time t1 detects that the support voltage V1 is lower than the corresponding first voltage threshold Vth1, to prevent the control module 200 from being powered down, the first switching tube S11 is controlled to be disconnected, the support voltage V1 starts to rise, and after a second preset time, the control module 200 enters a restart state, at time t2, after the first switching tube S11 is controlled to be closed for a third preset time, and at time t3, the control module 200 detects that the support voltage V1 is lower than the corresponding first voltage threshold Vth1, and controls the first switching tube S11 to be disconnected; after a second preset time, that is, at the time t4, the first switching tube S11 is controlled to be closed again, and at the time t5, the control module 200 detects that the support voltage V1 is lower than the corresponding first voltage threshold Vth1, and controls the first switching tube S11 to be opened again; after the second preset time, the first switching tube S11 is controlled to be closed again at the time t6, at the time t7, the control module 200 detects that the support voltage V1 is still lower than the corresponding first voltage threshold Vth1, and controls the first switching tube S11 to be opened, and the restart is still unsuccessful due to the fact that the number of restart failures is greater than the number threshold (the number threshold is, for example, 2 times, which may be set as required), and then the first switching tube S11 is controlled to be kept opened, the follow current tube D11 provides a follow current channel, and after the fourth preset time, the start state is entered again at the time t8, and if the number of restart failures is greater than the number threshold, the restart is still unsuccessful, the first switching tube S11 is controlled to be kept opened, the follow current tube D11 provides a follow current channel, and after the fourth preset time, the restart state is entered again, and the cycle is repeated until the abnormality disappears, and the restart is successful. As shown in fig. 8, at time t13, the first photovoltaic dc power PV1 returns to normal, and at time t14, the first switching tube S11 is controlled to be closed, and within a third preset time, it is not detected that the support voltage V1 is lower than the corresponding first voltage threshold Vth1, the first switching tube S11 is controlled to keep a normally closed state, and the shutdown is successful, and the shutdown continues to operate normally.
As can be seen from fig. 8, in the whole process of the first photovoltaic dc power supply PV1 recovering from the abnormal state to the normal state, the control module 200 does not have the problem of power failure restart, and the problem of frequent startup and shutdown of the auxiliary power supply module and the control module is avoided.
In a second exemplary embodiment, with reference to fig. 6 and 9, when the freewheeling tube D11 is a switching tube, when the first turn-off module is restarted many times or is not restarted successfully after a certain time, as shown in the figure, during a period t7-t8, that is, within a fourth preset time, the control module provides the driving signal Vbs to control the conduction of the freewheeling tube D11, and provide a freewheeling channel to reduce the freewheeling loss, which further solves the problem in the prior art that the freewheeling tube cannot be continuously conducted because the control module is restarted frequently, so that the power bus current flows through the freewheeling diode therein, which causes serious heat generation of the turn-off device and affects the operational reliability of the turn-off device.
Because the shutdown device is generally provided with component level monitoring, the original input voltage monitoring unit of the shutdown device can be reused in some embodiments, and a detection unit for detecting the supporting voltage does not need to be additionally arranged.
In the third exemplary embodiment, a control method of the shutdown device is explained by taking an example in which the detection unit acquires the input voltage Vin.
With reference to fig. 3 and 8, during the operation of the shutdown device, at time t0, the first photovoltaic dc power supply PV1 is abnormal, for example, is shielded, so that the output power of the first photovoltaic dc power supply PV1 decreases, the output voltage of the first photovoltaic dc power supply PV1 starts to decrease, at time t1, the control module 200 detects that the input voltage Vin is lower than the corresponding second voltage threshold Vth2, to prevent the control module 200 from power down, the first switching tube S11 is controlled to be turned off, the input voltage Vin starts to rise, and after a second preset time, the control module 200 enters a restart state, and at time t2, the first switching tube S11 is controlled to be turned on, and after a third preset time, that is, at time t3, the control module 200 detects that the input voltage Vin is lower than the corresponding second voltage threshold Vth2, and controls the first switching tube S11 to be turned off; after a second preset time, that is, at the time t4, the first switching tube S11 is controlled to be closed again, and after a third preset time, at the time t5, the control module 200 detects that the input voltage Vin is still lower than the corresponding second voltage threshold Vth2, and controls the first switching tube S11 to be opened again; after the second preset time, the first switching tube S11 is controlled to be closed again at the time t6, after the third preset time, and at the time t7, the control module 200 detects that the input voltage Vin is still lower than the corresponding second voltage threshold Vth2, and controls the first switching tube S11 to be opened again, and the restart is not successful because the number of times of the restart failure is greater than the number of times threshold (e.g., the number of times threshold is 2, which can be set as required), and then controls the first switching tube S11 to be kept opened, and the follow current tube D11 provides a follow current channel, and after the fourth preset time, the first switching tube S11 enters the start state again at the time t8, and if the number of times of the restart failure is greater than the number of times threshold, the restart is still unsuccessful, the first switching tube S11 is controlled to be kept opened, and the follow current channel is provided by the follow current tube D11, and after the fourth preset time, the first switching tube S11 enters the start state again, and the cycle is repeated until the abnormal restart disappears, and the restart is successful. As shown in the figure, at the time t13, the first photovoltaic direct-current power supply PV1 is recovered to be normal, at the time t14, the first switching tube S11 is controlled to be closed, after a third preset time, the control module 200 detects that the input voltage Vin is not lower than the corresponding second voltage threshold Vth2, the first switching tube S11 is controlled to be kept in a normally closed state, the restart is successful, and the shutdown device continues to operate normally. As can be seen from fig. 8, in the whole process of recovering the first photovoltaic direct-current power supply PV1 from the abnormality to the normal state, the control module does not have the power failure problem, so the photovoltaic system can continue to operate normally according to the state before the abnormality.
In the fourth exemplary embodiment, a method of controlling the shutdown device is explained by taking an example in which the detection unit acquires the input voltage Vin.
With reference to fig. 5 and fig. 10, in the normal operation process of the shutdown device, the working state of the first switching tube S11 is the same as that of the first embodiment, and is not described again, it can be known from the figure that in the whole process of recovering the first photovoltaic dc power supply PV1 from the abnormal state to the normal state, the control module 200 does not have the power failure problem, no matter how the state of the second photovoltaic dc power supply PV2 is, the control module 200 controls the switching tube S21 to be always in the closed state, and the second photovoltaic dc power supply PV2 normally works to provide power output. Therefore, when the shutdown device has a plurality of inputs and is correspondingly connected with a plurality of photovoltaic direct-current power supplies, and the photovoltaic direct-current power supplies providing power for the auxiliary power supply module 300 are abnormal, the controller cannot be powered down, the normal work of other photovoltaic direct-current power supplies cannot be influenced, the other photovoltaic direct-current power supplies can be connected into a power bus to generate power, and the reliability of the shutdown device is improved.
In the starting process of the shutdown device, when the first photovoltaic direct-current power supply PV1 supplying power to the auxiliary power supply module 300 is in an abnormal or weak light state, the control module 200 can be normally started without power failure, the normal starting of the shutdown module connected with other photovoltaic direct-current power supplies is not affected, and the other photovoltaic direct-current power supplies can be connected to a power bus to generate power, so that the reliability of the shutdown device is improved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (20)
1. A shutter, characterized in that it comprises:
the first turn-off module is used for controlling connection between the first photovoltaic direct-current power supply and the power bus;
the control module is connected with the first turn-off module and is used for controlling the first turn-off module;
the auxiliary power supply module is connected with the control module and used for getting power from the first photovoltaic direct-current power supply and supplying power to the control module;
the control module is further configured to detect a power supply supporting capability of the auxiliary power supply module, and when the power supply supporting capability of the auxiliary power supply module is lower than a supporting capability threshold, control the first turn-off module to turn off to disconnect the connection between the first photovoltaic direct-current power supply and the power bus.
2. The shutdown device according to claim 1, wherein the control module obtains a voltage signal indicative of a power supply supporting capability of the auxiliary power supply module, and controls the first shutdown module to be turned off when the voltage signal is lower than a corresponding voltage threshold.
3. The shutdown device according to claim 1, wherein during a startup process of the shutdown device, the control module obtains an input voltage of the first shutdown module, which is indicative of a power supply supporting capability of the auxiliary power supply module, and when the input voltage is lower than a corresponding voltage threshold, the control module controls the first shutdown module to turn off if the input voltage is still lower than the corresponding voltage threshold after a first preset time.
4. The shutdown device according to claim 1, wherein in a process of restarting the first shutdown module, the control module closes the first shutdown module after controlling the first shutdown module to be disconnected for a second preset time, and after closing the first shutdown module for a third preset time, if a voltage signal representing a power supply supporting capability of the auxiliary power supply module is not lower than a corresponding voltage threshold, the restart is successful, the first shutdown module is controlled to be kept in a normally-closed state, and if the voltage signal is lower than the corresponding voltage threshold, the restart is failed, and the first shutdown module is controlled to be disconnected.
5. The shutdown device as claimed in claim 4, wherein if the number of times of restart failure is greater than the threshold number of times, the control module controls the first shutdown module to turn off for a fourth preset time, and then restart the first shutdown module again, where the fourth preset time is greater than the second preset time.
6. The shutdown device of claim 1, wherein the first shutdown module comprises:
at least one first switching tube connected between the first photovoltaic direct current power source and the power bus;
and the follow current pipe is connected to the output end of the first turn-off module and used for providing a follow current channel.
7. The shutoff device according to claim 6, wherein when the follow current tube is a switch tube, if the number of times of restart failure of the first shutdown module is greater than a threshold number of times, the control module controls the follow current tube to be turned on within a fourth preset time.
8. The shutdown device of claim 1, wherein the auxiliary power module comprises:
the supporting unit is used for getting electricity from the first photovoltaic direct-current power supply and providing supporting voltage;
and the power supply unit is used for converting the supporting voltage to generate a power supply voltage provided for the control module.
9. The shutter according to claim 8, characterized in that the control module comprises:
the detection unit is used for acquiring a voltage signal representing power supply supporting capacity; the voltage signal is an input voltage of the first turn-off module or the support voltage or a supply voltage;
and the control unit is used for controlling the first turn-off module to be turned off when the voltage signal is lower than the corresponding voltage threshold.
10. The shutter according to claim 8, characterized in that the supporting unit comprises:
and the supporting capacitor is connected with the power supply unit in parallel.
11. The shutdown device of claim 8, wherein the auxiliary power module further comprises:
and the voltage stabilizer is connected to the input end of the supporting unit and is used for reducing or stabilizing the input voltage of the power supply unit.
12. The gate breaker of claim 1, further comprising:
at least one second turn-off module connected between the corresponding second photovoltaic direct-current power supply and the power bus, for controlling the connection between the corresponding second photovoltaic direct-current power supply and the power bus, wherein the output ends of the first turn-off module and the second turn-off module are connected; the second turn-off module is connected with the control module, and the control module is also used for controlling the second turn-off module;
when the power supply supporting capacity is lower than a supporting capacity threshold value, the control module controls the first turn-off module to disconnect the connection between the first photovoltaic direct-current power supply and the power bus and controls the second turn-off module to keep working normally.
13. A method of controlling a shutdown device comprising a first shutdown module for controlling a connection between a first photovoltaic dc power source and a power bus, a control module connected to the first shutdown module, and an auxiliary power module connected to the control module, the method comprising:
the control module detects the power supply supporting capacity of the auxiliary power supply module;
when the power supply supporting capacity of the auxiliary power supply module is lower than a supporting capacity threshold value, the control module controls the first turn-off module to be disconnected so as to disconnect the first photovoltaic direct-current power supply from the power bus.
14. The method according to claim 13, characterized in that the control module acquires a voltage signal representative of the power supply support capacity of the auxiliary power supply module and controls the first switch-off module to switch off when the voltage signal is lower than a corresponding voltage threshold.
15. The method according to claim 13, characterized in that during the startup of the shutdown device, the control module obtains an input voltage of a first shutdown module characterizing the power supply support capability of the auxiliary power supply module, and when the input voltage is lower than a corresponding voltage threshold, after a first preset time, if the input voltage is still lower than the corresponding voltage threshold, the control module controls the first shutdown module to be turned off.
16. The method according to claim 13, wherein in a process of restarting the first shutdown module, the control module closes the first shutdown module after controlling the first shutdown module to be disconnected for a second preset time, and after closing the first shutdown module for a third preset time, if a voltage signal representing power supply supporting capability of the auxiliary power supply module is not lower than a corresponding voltage threshold, the restart is successful, the first shutdown module is controlled to be kept in a normally-closed state, and if the voltage signal is lower than the corresponding voltage threshold, the restart is failed, and the first shutdown module is controlled to be disconnected.
17. The method according to claim 16, wherein if the number of restart failures is greater than a threshold number of times, the control module controls the first shutdown module to turn off for a fourth preset time and then restart again, and the fourth preset time is greater than the second preset time.
18. The method of claim 13, wherein the first shutdown module comprises a freewheeling tube connected at an output of the first shutdown module for providing a freewheeling path;
when the follow current pipe is a switch pipe, if the number of times of restart failure of the first turn-off module is greater than a number threshold, the control module controls the follow current pipe to be conducted within fourth preset time.
19. The method of claim 13, wherein the shutdown device further comprises at least one second shutdown module connected between a corresponding second photovoltaic dc power source and the power bus for controlling the connection between the corresponding second photovoltaic dc power source and the power bus, wherein the first and second shutdown modules are connected at their outputs, and wherein the control module is connected to the second shutdown module;
when the power supply supporting capacity is lower than a supporting capacity threshold value, the control module controls the first turn-off module to disconnect the connection between the first photovoltaic direct-current power supply and the power bus and controls the second turn-off module to keep working normally.
20. A photovoltaic power generation system comprising at least one photovoltaic dc power source and at least one shutdown device as claimed in any one of claims 1 to 12, the output of the photovoltaic dc power source being connected to a power bus via the shutdown device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211651944.6A CN115632389B (en) | 2022-12-22 | 2022-12-22 | Shutoff device, control method thereof and photovoltaic power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211651944.6A CN115632389B (en) | 2022-12-22 | 2022-12-22 | Shutoff device, control method thereof and photovoltaic power generation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115632389A CN115632389A (en) | 2023-01-20 |
| CN115632389B true CN115632389B (en) | 2023-03-14 |
Family
ID=84909925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211651944.6A Active CN115632389B (en) | 2022-12-22 | 2022-12-22 | Shutoff device, control method thereof and photovoltaic power generation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115632389B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602504B (en) * | 2017-02-28 | 2018-11-06 | 阳光电源股份有限公司 | A kind of photovoltaic Quick shut-off device and photovoltaic system |
| CN113746314B (en) * | 2021-11-03 | 2022-02-22 | 杭州禾迈电力电子股份有限公司 | Photovoltaic inverter and starting control method |
| CN114050811B (en) * | 2022-01-13 | 2022-05-17 | 杭州禾迈电力电子股份有限公司 | Multi-input shutoff device, control method and photovoltaic power generation system |
| CN115249964A (en) * | 2022-07-08 | 2022-10-28 | 深圳市禾望科技有限公司 | Shutoff device, control method thereof, inverter and photovoltaic power generation system |
-
2022
- 2022-12-22 CN CN202211651944.6A patent/CN115632389B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 汤海宁 等.光伏电站并网有功功率控制策略的设计与实现.第31卷(第08期),第75-79页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115632389A (en) | 2023-01-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3624333B1 (en) | Shutdown method for photovoltaic module | |
| EP3945655A1 (en) | Method for controlling operation of a module level power electronics device in a photovoltaic system, and photovoltaic system | |
| US9356553B2 (en) | String continuity monitoring | |
| US10411459B2 (en) | Photovoltaic power generation system and method for shutting down the same | |
| CN108475942B (en) | Emergency unit, lighting system, emergency operation device and emergency unit operation method | |
| CN115663769B (en) | Direct-current parallel arc protection and positioning system and method for photovoltaic power generation system | |
| JP2016157364A (en) | Power control unit and control method thereof | |
| CN113078878A (en) | PV (photovoltaic) string optimizer and short-circuit protection method thereof | |
| WO2018113704A1 (en) | A switching arrangement for switching between two inputs, equipment, system and a method | |
| CN110649645B (en) | Quick turn-off device and photovoltaic power generation system applicable to same | |
| US11644506B2 (en) | Power switch fault detection method and power switch fault detection circuit | |
| CN115632389B (en) | Shutoff device, control method thereof and photovoltaic power generation system | |
| CN105005007A (en) | Fault detection apparatus of redundant auxiliary power system and method thereof | |
| KR101442818B1 (en) | Dual controller and method for outputting control signal of the same | |
| CN116169650A (en) | No-delay photovoltaic module turn-off method, MLPE (multi-layer polyethylene) equipment and photovoltaic inverter | |
| JP2013206090A (en) | Power supply controller, information system and power supply control method using the same | |
| AU2022243295A1 (en) | Photovoltaic assembly shutoff device, inverter, and photovoltaic quick shutoff system and starting method therefor | |
| CN115249964A (en) | Shutoff device, control method thereof, inverter and photovoltaic power generation system | |
| JP4575876B2 (en) | Inverter device and inverter system | |
| JP2016123241A (en) | Power conditioner | |
| WO2022257215A1 (en) | Shutdown device control method and apparatus, and shutdown device | |
| CN113131600B (en) | Power supply control system, electrical equipment and electrical equipment control method | |
| WO2024048019A1 (en) | Electric power supply system | |
| CN112924855B (en) | Grid-connected relay circuit | |
| CN111316532B (en) | Charging device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |