CN111478661B - Component-level turn-off control method and turn-off controller of photovoltaic power station - Google Patents
Component-level turn-off control method and turn-off controller of photovoltaic power station Download PDFInfo
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- H—ELECTRICITY
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- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
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- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
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Abstract
The application discloses a component-level turn-off control method and a turn-off controller of a photovoltaic power station, which are used for accurately feeding back whether high-voltage electric shock hidden danger exists on the direct current side of the photovoltaic power station. The output ends of the plurality of shutoff devices are connected in series to obtain a high-voltage direct-current power supply, n high-voltage direct-current power supplies are connected to the photovoltaic inverter, n is larger than or equal to 2, and the shutoff controller is powered by the nth high-voltage direct-current power supply. The method is applied to the turn-off controller and comprises the following steps: when a turn-off command is received, a turn-off device on the 1 st to n-1 st paths of high-voltage direct-current power supplies is controlled to be turned off, then the output voltages of the 1 st to n-1 th paths of direct-current power supplies sampled by the photovoltaic inverter are obtained and whether the output voltages are all smaller than a preset value is judged, if yes, the step of: and controlling a shutoff device on the nth direct current power supply to be disconnected, then sampling the output voltage of the nth direct current power supply and judging whether the output voltage is smaller than the preset value under the self power supply of an internal power supply of the shutoff controller, and if so, outputting a state indication that no high-voltage electric shock hidden danger exists on the direct current side of the photovoltaic power station.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a component-level turn-off control method and a turn-off controller of a photovoltaic power station.
Background
In the photovoltaic power station shown in fig. 1, an input end of each breaker is connected to at least one photovoltaic module, output ends of a plurality of breakers are connected in series to obtain a direct current power supply, and output ends of a plurality of direct current power supplies are connected to the same photovoltaic inverter. All the shut-off devices are controlled in a centralized mode by one shut-off controller, and when abnormal conditions such as fire disasters and the like occur in the photovoltaic power station or installation and maintenance are carried out, the shut-off controller sends a shut-off command to control all the shut-off devices to be disconnected, so that the direct-current high voltage output by each direct-current power supply is reduced to be below the safe voltage, and high-voltage electric shock accidents of fire fighting or maintenance personnel entering the photovoltaic power station are avoided.
According to the scheme, after the turn-off controller issues the turn-off command, the direct-current high voltage existing on the direct-current side of the photovoltaic power station is directly determined to be eliminated. However, in the actual shutdown control process, it is inevitable that a fault (e.g., a communication fault) occurs, so that the shutdown device on one or more direct current power supplies fails to perform the shutdown operation, and at this time, if someone enters the photovoltaic power station in a trade, a high-voltage electric shock accident is easily caused.
Disclosure of Invention
In view of the above, the invention provides a component-level turn-off control method and a turn-off controller for a photovoltaic power station, so as to realize accurate feedback of whether a high-voltage electric shock hidden danger exists on a direct current side of the photovoltaic power station, and enable personnel to enter the photovoltaic power station after safety feedback is confirmed, so that high-voltage electric shock accidents cannot occur.
A component level turn-off control method of a photovoltaic power station is applied to a turn-off controller; in a photovoltaic power station, the input end of each breaker is respectively connected with at least one photovoltaic module, the output ends of a plurality of breakers are mutually connected in series to obtain a direct current power supply, the output ends of n direct current power supplies are connected into the same photovoltaic inverter, n is more than or equal to 2, and the turn-off controller is powered by the nth direct current power supply;
the component-level shutdown control method comprises the following steps:
when a turn-off command is received, controlling all turn-off devices on the 1 st to n-1 st paths of direct current power supplies to be turned off, and then obtaining the output voltage of the 1 st to n-1 st paths of direct current power supplies sampled by the photovoltaic inverter;
judging whether the output voltages of the 1 st to n-1 st paths of direct current power supplies are all smaller than a preset value, if so, then: and controlling all the turn-off devices on the nth direct current power supply to be turned off, then sampling the output voltage of the nth direct current power supply and judging whether the output voltage is smaller than the preset value or not under the self-power supply of the standby power supply in the turn-off controller, and if so, outputting a state indication that no high-voltage electric shock hidden danger exists on the direct current side of the photovoltaic power station.
Optionally, the turn-off command is an electrical signal sent by a user pressing an emergency stop button on the turn-off controller, or the turn-off command is an early warning signal sent by the user through a communication device, or the turn-off command is an electrical signal sent when the local sensor detects an abnormal condition.
Optionally, the local sensor includes an arc detection magnetic ring disposed on a dc side of the photovoltaic power station, a secondary side output of the arc detection magnetic ring is connected to the shutdown controller, and the arc detection magnetic ring sends an electrical signal to the shutdown controller when detecting a dc arc, as the shutdown command.
Optionally, in any of the above-disclosed component-level shutdown control methods, the shutdown controller includes a control module, a first communication module and a second communication module, the control module is connected to all the shutdown devices on the 1 st to n-1 st dc power supplies through the first communication module, and the control module is connected to all the shutdown devices on the n th dc power supply through the second communication module;
the step of controlling all the shutoff devices on the 1 st to n-1 st paths of direct current power supplies to be disconnected comprises the following steps: the control module sends a turn-off instruction to all the turn-off devices connected with the first communication module through the first communication module;
the controlling all the turn-off devices on the nth direct current power supply to be turned off comprises: and the control module issues a turn-off instruction to all the turn-off devices connected with the second communication module through the second communication module.
Alternatively, in any of the above-disclosed component-level shutdown control methods, the shutdown controller includes a control module and a communication module; the shutdown controller acquires the identities and the attribution topological relation information of all the shutdown devices on the 1 st to the nth direct-current power supplies in an internal storage or external communication mode, the identities and the attribution topological relation information of the shutdown devices on the 1 st, 2 nd, … … th, n-2 th or n-1 th direct-current power supplies are first information, and the identities and the attribution topological relation information of the shutdown devices on the nth direct-current power supplies are second information;
the step of controlling all the shutoff devices on the 1 st to n-1 st paths of direct current power supplies to be disconnected comprises the following steps: the control module issues a turn-off instruction to a turn-off device with all identity and attribution topological relation information as first information through the communication module;
the controlling all the turn-off devices on the nth direct current power supply to be turned off comprises: and the control module issues a turn-off instruction to the turn-off device of which all the identity and attribution topological relation information is the second information through the communication module.
Optionally, in any one of the above disclosed component-level turn-off control methods, the turn-off controller also supplies power by using a power grid, and before controlling all the turn-off devices on the 1 st to n-1 st dc power supplies to be turned off, the method further includes: and controlling the turn-off controller to disconnect from the power grid.
Optionally, in any one of the module-level turn-off control methods disclosed above, the outputting a status indication of no high-voltage electric shock hazard on the dc side of the photovoltaic power plant includes:
the state indicator lamp mounted on the turn-off controller visually shows the state that no high-voltage electric shock hidden danger exists on the direct current side of the photovoltaic power station, and the state indicator lamp is always on when the high-voltage electric shock hidden danger exists on the direct current side of the photovoltaic power station;
or sending a control signal to the communication equipment to indicate the communication equipment to visually display the state that the direct current side of the photovoltaic power station has no high-voltage electric shock hidden danger.
In the photovoltaic power station, the input end of each breaker is respectively connected with at least one photovoltaic module, the output ends of a plurality of breakers are mutually connected in series to obtain a direct current power supply, n paths of output ends of the direct current power supplies are connected into the same photovoltaic inverter, and n is more than or equal to 2, wherein the shutdown controller is powered by the nth direct current power supply;
the turn-off controller comprises a command receiving module, a control module, an inverter communication module, a turn-off device communication system, a sampling module and a standby power supply, wherein:
the control module is used for controlling all the breakers on the 1 st to n-1 st direct-current power supplies to be disconnected through the breaker communication system when a turn-off command is received through the command receiving module, then obtaining the output voltages of the 1 st to n-1 st direct-current power supplies sampled by the photovoltaic inverter through the inverter communication module, judging whether the output voltages of the 1 st to n-1 st direct-current power supplies are all smaller than a preset value, if so, controlling all the breakers on the nth direct-current power supplies to be disconnected through the breaker communication system, then controlling the sampling module to sample the output voltage of the nth direct-current power supply under the power supply of the standby power supply, judging whether the output voltage is also smaller than the preset value, and if so, outputting a state indication that no high-voltage electric shock hidden danger exists on the direct-current side of the photovoltaic power station.
Optionally, in the shutdown controller of the photovoltaic power station disclosed above, the shutdown controller communication system includes a first communication module and a second communication module, the control module is connected to all the shutdown devices on the 1 st to n-1 st dc power supplies through the first communication module, and the control module is connected to all the shutdown devices on the n th dc power supply through the second communication module;
the control module is used for issuing a turn-off instruction to all the turn-off devices connected with the first communication module through the first communication module so as to control all the turn-off devices on the 1 st to n-1 th direct-current power supplies to be turned off;
the control module is used for issuing a turn-off instruction to all the turn-off devices connected with the second communication module through the second communication module, so that all the turn-off devices on the nth direct-current power supply are controlled to be turned off.
Or, in the shutdown controller of the photovoltaic power station disclosed above, the shutdown controller obtains the identities and the attribution topology relationship information of all the shutdown devices on the 1 st to nth direct-current power supplies in an internal storage or external communication manner, the identities and the attribution topology relationship information of the shutdown devices on the 1 st, 2 nd, … … th, n-2 th or n-1 th direct-current power supplies are first information, and the identities and the attribution topology relationship information of the shutdown devices on the nth direct-current power supplies are second information;
the communication system of the breaker is a communication module;
the control module is used for issuing a turn-off instruction to the turn-off devices of which all the identity and attribution topological relation information is first information through the communication module so as to control all the turn-off devices on the 1 st to n-1 st paths of direct current power supplies to be turned off;
the control module is used for issuing a turn-off instruction to the turn-off devices of which all the identity and attribution topological relation information are second information through the communication module, so that all the turn-off devices on the nth direct current power supply are controlled to be turned off.
Optionally, in the shutdown controller of any one of the photovoltaic power stations disclosed above, the shutdown controller also supplies power by using a power grid, and the control module is further configured to control the whole shutdown controller to disconnect from the power grid before the control module controls the shutdown devices on the 1 st to n-1 st direct-current power supplies to disconnect completely through the shutdown device communication system.
According to the technical scheme, one path of direct current power supply is used for supplying power to the shutdown controller, and the shutdown controller controls the subordinate shutdown devices in a time-sharing manner when receiving the shutdown command: the method comprises the steps of firstly disconnecting the breakers on the other direct current power supplies under the power supply of the direct current power supply, confirming whether the breakers are successfully disconnected or not through communication with the photovoltaic inverter, disconnecting the breakers on the direct current power supply for supplying power to the disconnection controller if the breakers are successfully disconnected, and then confirming whether the breakers on the last direct current power supply are successfully disconnected or not under the power supply of self standby power, so that accurate detection and output feedback on whether high-voltage electric shock hidden danger exists on the direct current side of the photovoltaic power station are completed. And only a small amount of standby power is stored in the shutdown controller, so that the cost is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a photovoltaic power station disclosed in the prior art;
FIG. 2 is a schematic structural diagram of a photovoltaic power plant according to an embodiment of the present invention;
FIG. 3 is a flowchart of a component-level shutdown control method for a photovoltaic power plant according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another photovoltaic power plant disclosed in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a shutdown controller according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another shutdown controller disclosed in the embodiment of the present invention;
fig. 7 is a schematic structural diagram of another shutdown controller according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a component level turn-off control method of a photovoltaic power station, which is applied to a turn-off controller in the photovoltaic power station.
The topological structure of the photovoltaic power station is shown in fig. 2, and specifically includes:
the input end of each breaker is respectively connected with at least one photovoltaic module (when the input end of each breaker is connected with a plurality of photovoltaic modules, the photovoltaic modules can be connected in series, in parallel or in series-parallel, fig. 2 only takes the example that the input end of each breaker is respectively connected with one photovoltaic module as an example), and the output ends of a plurality of breakers are mutually connected in series to obtain one path of direct current power supply; and the output ends of the multiple direct current power supplies are connected to the same photovoltaic inverter.
The photovoltaic inverter is an energy conversion device in a photovoltaic power station, and is used for converting multiple paths of high-voltage direct current input into at least one path of alternating current output, and merging the converted alternating current into a power grid or supplying power to a local load (fig. 2 only takes the merging into the power grid as an example). For grid-connected photovoltaic inverters, when abnormal conditions such as fire disasters occur in photovoltaic power stations or installation and maintenance are carried out, the photovoltaic inverters can be automatically disconnected from a power grid.
And communication connection is established between the photovoltaic inverter and the disconnection controller, and the communication mode is 485 communication, for example. The shutdown controller is further in Communication connection with each shutdown device, and the Communication mode between the shutdown devices and the shutdown controller may be, for example, Zigbee Communication or PLC (Power Line Communication).
The turn-off controller is powered by one of the DC power supplies. For convenience of description, it is assumed in fig. 2 that n dc power supplies are provided, which are dc power supply 1, dc power supplies 2 and …, and dc power supply n, where n is the total number of dc power supplies, and n is greater than or equal to 2; the output voltage of the DC power supply i is ViAnd i is 1, 2, … and n, and the turn-off controller is powered by a direct current power supply n.
As shown in fig. 3, the component-level shutdown control method includes:
step S01: and judging whether a turn-off command is received or not, if so, entering the step S02, otherwise, returning to the step S01.
Specifically, when an abnormal condition such as a fire disaster occurs in the photovoltaic power station or installation and maintenance are performed, the shutdown controller receives a shutdown command. The shutdown command may be an electrical signal sent by a user pressing an emergency stop button on the shutdown controller, or may be an early warning signal sent by the user through a communication device (the communication device is, for example, a device dedicated to sending the early warning signal, or the communication device may be an intelligent device downloaded with an application program dedicated to sending the early warning signal, the intelligent device is, for example, a mobile phone, a computer, or the like), or may be an electrical signal sent when an abnormal condition is detected by a local sensor. For example, direct current arcing accounts for a large proportion in the ignition reason of the photovoltaic power station, for the reason, at least one arcing detection magnetic ring (the arcing detection magnetic ring belongs to a local sensor, at least one path of direct current power supply is managed by one arcing detection magnetic ring) is arranged on the direct current side of the photovoltaic power station, for saving cost, multiple paths of direct current power supplies can penetrate through the same arcing detection magnetic ring, the secondary side output of the arcing detection magnetic ring is connected to a turn-off controller, and when the arcing detection magnetic ring detects direct current arcing, an electric signal is sent to the turn-off controller to serve as a turn-off command.
Step S02: controlling the turn-off devices on the direct current power supplies 1 to n-1 to be completely disconnected, and then obtaining the output voltage V of the direct current power supplies 1 to n-1 sampled by the photovoltaic inverter1～Vn-1. Thereafter, the process proceeds to step S03.
Step S03: judgment V1～Vn-1And if the values are less than the preset values, the step S04 is executed, and if not, the step S02 is executed again. Wherein the preset value is set to be a safe voltage of 120V, for example.
Step S04: controlling the turn-off device on the direct current power supply n to be completely turned off, and then sampling the output voltage V of the direct current power supply n under the self power supply of the standby power supply in the turn-off controllern. Thereafter, the process proceeds to step S05.
Step S05: judgment VnAnd if the value is smaller than the preset value, the step S04 is carried out, and if not, the step S04 is returned.
Step S06: and outputting a state indication that no high-voltage electric shock hidden danger exists on the direct current side of the photovoltaic power station, and finishing the control.
Specifically, on the premise of not considering the power supply problem of the photovoltaic inverter and the shutdown controller, there are: when a photovoltaic power station is in fire or other abnormal conditions or is installed and maintained, the shutdown controller should send a shutdown command to control the shutdown devices on the direct-current power supplies 1-n to be completely disconnected, so that the direct-current high voltage existing on the direct-current side of the photovoltaic power station is eliminated, and the fire-fighting maintenance personnel entering the photovoltaic power station are prevented from generating high-voltage electric shock accidents; the photovoltaic inverter has the function of sampling the output voltage of each direct-current power supply, after a turn-off command is sent down, the turn-off controller can be communicated with the photovoltaic inverter to obtain the output voltage of each direct-current power supply acquired by the photovoltaic inverter in real time, whether each shut-off device is successfully turned off or not is judged according to the output voltage, if each shut-off device is successfully turned off, the fact that no high-voltage electric shock hidden danger exists on the direct-current side of the photovoltaic power station is indicated, at the moment, a person is informed to enter the photovoltaic power station, and no high-voltage electric shock.
However, the problem of power supply of the photovoltaic inverter and the shutdown controller is a difficult problem, because when a photovoltaic power station is in abnormal conditions such as fire or the like or is installed and maintained, if the shutdown devices on the direct-current power supplies 1 to n are all disconnected, the photovoltaic inverter and the shutdown controller lose power supply, at this time, the photovoltaic inverter cannot sample output voltages of all direct-current power supplies, and the photovoltaic inverter cannot communicate with the shutdown controller.
In contrast, in the embodiment of the present invention, when abnormal conditions such as a fire disaster occur in the photovoltaic power station or installation and maintenance are performed, a time-sharing shutdown manner is adopted, that is,: firstly, all the turn-off devices on the direct current power supplies 1 to n-1 are turned off, and the direct current power supply n is reserved to continuously supply power for the photovoltaic inverter and the turn-off controller, so that the photovoltaic inverter can still sample the output voltage of each direct current power supply, and the turn-off controller can still obtain the output voltage V of the direct current power supplies 1 to n-1 collected by the photovoltaic inverter in real time through communicating with the photovoltaic inverter1～Vn-1(ii) a If V1～Vn-1All are smaller than a preset safe voltage value, which indicates that the turn-off devices on the direct current power supplies 1 to n-1 are successfully turned off; and then, controlling all the turn-off devices on the direct current power supply n to be turned off, wherein the photovoltaic inverter and the turn-off controller lose power supply at the moment, but the standby power supply in the turn-off controller stores a small amount of standby power which is enough for supporting the turn-off controller to sample the output voltage V of the direct current power supply nnAnd judgment of VnAnd if the voltage value is smaller than the preset safe voltage value, the shutoff devices on the direct-current power supply n are all successfully disconnected, the direct-current side of the photovoltaic power station has no high-voltage electric shock hidden danger, and at the moment, a person is informed to enter the photovoltaic power station, so that a high-voltage electric shock accident cannot occur. The turn-off controller can adopt a flyback power supply with direct current power supply or alternating current-direct current double power supply to supply power for the whole turn-off controller inside, a super capacitor is installed on an output part of the flyback power supply, and the super capacitor can be used as a standby power supply to store a small amount of standby power.
As can be seen from the above description, in the embodiment of the present invention, a direct current power supply is used to supply power to the shutdown controller, and the shutdown controller performs time-sharing control on the subordinate shutdown device when receiving the shutdown command: the method comprises the steps of firstly disconnecting the breakers on the other direct current power supplies under the power supply of the direct current power supply, confirming whether the breakers are successfully disconnected or not through communication with the photovoltaic inverter, disconnecting the breakers on the direct current power supply for supplying power to the disconnection controller if the breakers are successfully disconnected, and then confirming whether the breakers on the last direct current power supply are successfully disconnected or not under the power supply of self standby power, so that accurate detection and output feedback on whether high-voltage electric shock hidden danger exists on the direct current side of the photovoltaic power station are completed. And only a small amount of standby power is stored in the shutdown controller, so that the cost is low.
Wherein, the shutdown controller outputs the state indication that the dc side of the photovoltaic power station has no high-voltage electric shock hidden danger, and the state of the dc side of the photovoltaic power station having no high-voltage electric shock hidden danger can be visually displayed through the output device installed on the shutdown controller, for example: the state indicator lamp arranged on the turn-off controller is used for indicating whether the potential danger of high-voltage electric shock exists on the direct current side of the photovoltaic power station, the state indicator lamp is normally on when the potential danger of high-voltage electric shock exists on the direct current side of the photovoltaic power station, and the state indicator lamp is turned off when the potential danger of high-voltage electric shock does not exist on the direct current side of the photovoltaic power station.
Or, the shutdown controller outputs a state indication of no high-voltage electric shock hidden danger on the direct current side of the photovoltaic power station, or sends a control signal to the communication equipment to indicate the communication equipment to visually display the state of no high-voltage electric shock hidden danger on the direct current side of the photovoltaic power station. The communication device may be the same communication device or different communication devices as the communication device for sending the warning signal in the foregoing description.
In any of the embodiments disclosed above, the shutdown controller may distinguish whether the subordinate shutdown device is a shutdown device that needs to be shutdown at present by performing packet management or identity recognition on the subordinate shutdown device.
The grouping management mode is specifically as follows:
the turn-off controller comprises a control module, a first communication module and a second communication module, wherein the control module is connected to all turn-off devices on the direct-current power supplies 1-n-1 through the first communication module, and the control module is connected to all turn-off devices on the direct-current power supply n through the second communication module;
at this time, the step S02 of controlling all the shutdown devices on the dc power supplies 1 to n-1 to be turned off specifically includes: the control module sends a turn-off instruction to all the turn-off devices connected with the first communication module through the first communication module;
the step S04 described above is to control all the shutdown devices on the dc power supply n to be turned off, specifically: and the control module issues a turn-off instruction to all the turn-off devices connected with the second communication module through the second communication module.
The communication modes adopted by the first communication module and the second communication module are not limited. For example, in a certain practical application scenario, the first communication module and the second communication module may both adopt a PLC communication mode. The PLC communication is matched with a PLC high-frequency signal modulation and demodulation device, generally, the PLC communication device is provided with a PLC magnetic ring and a carrier coupler, and the PLC communication device and the carrier coupler are different in that the PLC magnetic ring is easy to lock a plurality of groups of serial cables, so that on-site wiring is facilitated; the carrier coupler is arranged on the printed circuit board and is connected with a communication line in series, so that the single cost is low; in the embodiment of the invention, when the communication between the shutdown device and the shutdown controller is realized by adopting the PLC communication, the PLC magnetic ring can be independently matched, the carrier coupler can also be independently matched, and the combination of the PLC magnetic ring and the carrier coupler can also be adopted, for example, the first communication module is matched with the PLC magnetic ring, and the second communication module is matched with the carrier coupler.
The identity recognition mode is as follows:
the turn-off controller comprises a control module and a communication module; the shutdown controller acquires the identity and the home topological relation information of all the shutdown devices on the direct current power supplies 1 to n through an internal storage or external communication mode (the acquisition through the internal storage mode means that the identity and the home topological relation information of all the shutdown devices on the direct current power supplies 1 to n are stored in the control module in advance, and the shutdown controller directly reads the information from the control unit when the stored information is needed, and the acquisition through the external communication mode means that the shutdown controller is acquired through communication with an external communication device, the communication device can output the identity and the home topological relation information of all the shutdown devices on the direct current power supplies 1 to n, and the communication device used for sending the early warning signal in the previous description can be the same communication device, the communication equipment and the communication equipment which visually displays the state of no high-voltage electric shock hidden danger on the direct current side of the photovoltaic power station can be the same communication equipment or different communication equipment, the identity and the attribution topological relation information of the on-off devices positioned on the direct current power supplies 1-n-1 are first information, and the identity and the attribution topological relation information of the on-off devices positioned on the direct current power supplies n are second information;
at this time, the step S02 of controlling all the shutdown devices on the dc power supplies 1 to n-1 to be turned off specifically includes: the control module issues a turn-off instruction to a turn-off device with all identity and attribution topological relation information as first information through the communication module;
the step S04 described above is to control all the shutdown devices on the dc power supply n to be turned off, specifically: and the control module issues a turn-off instruction to the turn-off device of which all the identity and attribution topological relation information is the second information through the communication module.
In any of the embodiments disclosed above, the shutdown controller is powered by a dc power source, and the shutdown controller may also be powered by the grid, for example, as shown in fig. 4. Then, before controlling all the shutdown devices on the dc power supplies 1 to n-1 to be turned off, the method further includes: and controlling the turn-off controller to disconnect from the power grid.
Corresponding to the method embodiment, the embodiment of the invention also discloses a shutdown controller of the photovoltaic power station, in the photovoltaic power station, the input end of each shutdown device is respectively connected with at least one photovoltaic module, the output ends of a plurality of shutdown devices are mutually connected in series to obtain a direct current power supply, the output ends of n direct current power supplies are connected into the same photovoltaic inverter, n is more than or equal to 2, and the shutdown controller is powered by the nth direct current power supply;
as shown in fig. 5, the shutdown controller includes a command receiving module 100, a control module 200, an inverter communication module 300, a shutdown communication system 400, a sampling module 500, and a backup power supply 600, wherein:
the control module 200 is configured to, when a shutdown command is received by the command receiving module 100, control all shutdown devices on the 1 st to n-1 st direct-current power supplies to be disconnected through the shutdown device communication system 400, then obtain output voltages of the 1 st to n-1 st direct-current power supplies sampled by the photovoltaic inverter through the inverter communication module 300, determine whether the output voltages of the 1 st to n-1 st direct-current power supplies are all smaller than a preset value, if so, control all shutdown devices on the nth direct-current power supplies to be disconnected through the shutdown device communication system 400, then, under the self-power supply of the standby power supply 600, control the sampling module 500 to sample the output voltage of the nth direct-current power supply, determine whether the output voltage is also smaller than the preset value, and if so, output a state indication that no high-voltage electric shock hazard exists on the direct-current side of the photovoltaic.
Optionally, as shown in fig. 6, the shutdown device communication system 400 includes a first communication module 401 and a second communication module 402, the control module 200 is connected to all shutdown devices on the 1 st to n-1 st dc power supplies through the first communication module 401, and the control module 200 is connected to all shutdown devices on the n th dc power supply through the second communication module 402;
the control module 200 is configured to issue a shutdown instruction to all shutdown devices connected to the first communication module 401 through the first communication module 401, so as to control all the shutdown devices on the 1 st to n-1 st dc power supplies to be turned off;
the control module 200 is configured to issue a shutdown instruction to all the shutdown devices connected to the second communication module 402 through the second communication module 402, so as to control all the shutdown devices on the nth dc power supply to be turned off.
Or, as shown in fig. 7, the shutdown controller obtains the identities and the attribution topology relationship information of all the shutdown devices on the 1 st to nth direct-current power supplies through internal storage or an external communication mode, where the identities and the attribution topology relationship information of the shutdown devices on the 1 st, 2 nd, … … th, n-2 th or n-1 th direct-current power supplies are first information, and the identities and the attribution topology relationship information of the shutdown devices on the nth direct-current power supplies are second information;
the shutdown communication system 400 includes a communication module 403;
the control module 200 is configured to issue a shutdown instruction to the shutdown device of which all the identity and home topology relationship information is the first information through the communication module 403, so as to control all the shutdown devices on the 1 st to n-1 st dc power supplies to be turned off;
the control module 200 is configured to issue a shutdown instruction to the shutdown devices whose all identity and home topology relationship information is the second information through the communication module 403, so as to control all the shutdown devices on the nth dc power supply to be turned off.
Optionally, in any of the above-disclosed embodiments of the shutdown controller, the shutdown controller also supplies power by using a power grid, and the control unit 200 is further configured to control the whole shutdown controller to disconnect from the power grid before controlling all the shutdown devices on the 1 st to n-1 st dc power supplies to disconnect through the shutdown device communication system 400.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A component level turn-off control method of a photovoltaic power station is applied to a turn-off controller; in a photovoltaic power station, the input end of each breaker is respectively connected with at least one photovoltaic module, the output ends of a plurality of breakers are mutually connected in series to obtain a direct current power supply, the output ends of n direct current power supplies are connected into the same photovoltaic inverter, and n is more than or equal to 2, and the power supply of the n direct current power supplies is adopted by the turn-off controller;
the component-level shutdown control method comprises the following steps:
when a turn-off command is received, controlling all turn-off devices on the 1 st to n-1 st paths of direct current power supplies to be turned off, and then obtaining the output voltage of the 1 st to n-1 st paths of direct current power supplies sampled by the photovoltaic inverter;
judging whether the output voltages of the 1 st to n-1 st paths of direct current power supplies are all smaller than a preset value, if so, then: and controlling all the turn-off devices on the nth direct current power supply to be turned off, then sampling the output voltage of the nth direct current power supply and judging whether the output voltage is smaller than the preset value or not under the self-power supply of the standby power supply in the turn-off controller, and if so, outputting a state indication that no high-voltage electric shock hidden danger exists on the direct current side of the photovoltaic power station.
2. The component-level shutdown control method according to claim 1, wherein the shutdown command is an electrical signal generated by a user pressing an emergency stop button on the shutdown controller, or the shutdown command is an early warning signal generated by the user through a communication device, or the shutdown command is an electrical signal generated when an abnormal condition is detected by a local sensor.
3. The component-level shutdown control method of claim 2, wherein the local sensor comprises an arc discharge detection magnetic ring disposed on a dc side of the photovoltaic power station, a secondary side output of the arc discharge detection magnetic ring is connected to the shutdown controller, and the arc discharge detection magnetic ring sends an electrical signal to the shutdown controller as the shutdown command when detecting a dc arc discharge.
4. The component-level shutdown control method according to claim 1, wherein the shutdown controller includes a control module, a first communication module and a second communication module, the control module is connected to all the shutdown devices on the 1 st to n-1 st dc power supplies through the first communication module, and the control module is connected to all the shutdown devices on the n th dc power supply through the second communication module;
the step of controlling all the shutoff devices on the 1 st to n-1 st paths of direct current power supplies to be disconnected comprises the following steps: the control module sends a turn-off instruction to all the turn-off devices connected with the first communication module through the first communication module;
the controlling all the turn-off devices on the nth direct current power supply to be turned off comprises: and the control module issues a turn-off instruction to all the turn-off devices connected with the second communication module through the second communication module.
5. The component-level shutdown control method according to claim 1, wherein the shutdown controller includes a control module and a communication module; the shutdown controller acquires the identities and the attribution topological relation information of all the shutdown devices on the 1 st to the nth direct-current power supplies in an internal storage or external communication mode, the identities and the attribution topological relation information of the shutdown devices on the 1 st, 2 nd, … … th, n-2 th or n-1 th direct-current power supplies are first information, and the identities and the attribution topological relation information of the shutdown devices on the nth direct-current power supplies are second information;
the step of controlling all the shutoff devices on the 1 st to n-1 st paths of direct current power supplies to be disconnected comprises the following steps: the control module issues a turn-off instruction to a turn-off device with all identity and attribution topological relation information as first information through the communication module;
the controlling all the turn-off devices on the nth direct current power supply to be turned off comprises: and the control module issues a turn-off instruction to the turn-off device of which all the identity and attribution topological relation information is the second information through the communication module.
6. The component-level turn-off control method according to claim 1, wherein the turn-off controller also supplies power by using a power grid at the same time, and before controlling all the turn-off devices on the 1 st to n-1 st direct-current power supplies to be turned off, the method further comprises: and controlling the turn-off controller to disconnect from the power grid.
7. The component-level shutdown control method of claim 1, wherein the outputting of the indication of the state of the dc side of the photovoltaic power plant without the potential for high-voltage shock comprises:
the state indicator lamp mounted on the turn-off controller visually shows the state that no high-voltage electric shock hidden danger exists on the direct current side of the photovoltaic power station, and the state indicator lamp is always on when the high-voltage electric shock hidden danger exists on the direct current side of the photovoltaic power station;
or sending a control signal to the communication equipment to indicate the communication equipment to visually display the state that the direct current side of the photovoltaic power station has no high-voltage electric shock hidden danger.
8. A shutdown controller of a photovoltaic power station is characterized in that in the photovoltaic power station, the input end of each shutdown device is respectively connected with at least one photovoltaic module, the output ends of a plurality of shutdown devices are mutually connected in series to obtain a direct current power supply, n direct current power supplies are connected to the same photovoltaic inverter, and n is more than or equal to 2;
the turn-off controller comprises a command receiving module, a control module, an inverter communication module, a turn-off device communication system, a sampling module and a standby power supply, wherein:
the control module is used for controlling all the breakers on the 1 st to n-1 st direct-current power supplies to be disconnected through the breaker communication system when a turn-off command is received through the command receiving module, then obtaining the output voltages of the 1 st to n-1 st direct-current power supplies sampled by the photovoltaic inverter through the inverter communication module, judging whether the output voltages of the 1 st to n-1 st direct-current power supplies are all smaller than a preset value, if so, controlling all the breakers on the nth direct-current power supplies to be disconnected through the breaker communication system, then controlling the sampling module to sample the output voltage of the nth direct-current power supply under the power supply of the standby power supply, judging whether the output voltage is also smaller than the preset value, and if so, outputting a state indication that no high-voltage electric shock hidden danger exists on the direct-current side of the photovoltaic power station.
9. A shutdown controller according to claim 8, wherein the communication system of the shutdown controller includes a first communication module and a second communication module, the control module is connected to all the shutdown devices on the 1 st to n-1 st dc power supplies through the first communication module, and the control module is connected to all the shutdown devices on the n th dc power supply through the second communication module;
the control module is used for issuing a turn-off instruction to all the turn-off devices connected with the first communication module through the first communication module so as to control all the turn-off devices on the 1 st to n-1 th direct-current power supplies to be turned off;
the control module is used for issuing a turn-off instruction to all the turn-off devices connected with the second communication module through the second communication module, so that all the turn-off devices on the nth direct-current power supply are controlled to be turned off.
10. A shutdown controller according to claim 8, wherein the shutdown controller obtains the identities and the attribution topology relationship information of all the shutdown devices on the 1 st to nth dc power supplies through internal storage or an external communication manner, the identities and the attribution topology relationship information of the shutdown devices on the 1 st, 2 nd, … … th, n-2 th or n-1 th dc power supplies are first information, and the identities and the attribution topology relationship information of the shutdown devices on the nth dc power supplies are second information;
the communication system of the breaker is a communication module;
the control module is used for issuing a turn-off instruction to the turn-off devices of which all the identity and attribution topological relation information is first information through the communication module so as to control all the turn-off devices on the 1 st to n-1 st paths of direct current power supplies to be turned off;
the control module is used for issuing a turn-off instruction to the turn-off devices of which all the identity and attribution topological relation information are second information through the communication module, so that all the turn-off devices on the nth direct current power supply are controlled to be turned off.
11. A turn-off controller according to claim 8, wherein the turn-off controller also supplies power from the power grid, and the control module is further configured to control the entire turn-off controller to disconnect from the power grid before the control module controls the turn-off devices on the 1 st to n-1 st dc power supplies to disconnect completely through the communication system of the turn-off devices.
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| US20180102736A1 (en) * | 2012-01-30 | 2018-04-12 | Solaredge Technologies Ltd. | Photovolatic Panel Circuitry |
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| US20180102736A1 (en) * | 2012-01-30 | 2018-04-12 | Solaredge Technologies Ltd. | Photovolatic Panel Circuitry |
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