CN110661296A - Shutdown system, device and method of photovoltaic module and readable storage medium - Google Patents
Shutdown system, device and method of photovoltaic module and readable storage medium Download PDFInfo
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- CN110661296A CN110661296A CN201910982357.7A CN201910982357A CN110661296A CN 110661296 A CN110661296 A CN 110661296A CN 201910982357 A CN201910982357 A CN 201910982357A CN 110661296 A CN110661296 A CN 110661296A
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention provides a turn-off system, a turn-off device, a turn-off method and a readable storage medium of a photovoltaic assembly, wherein the turn-off system of the photovoltaic assembly comprises a turn-off controller and a turn-off device connected with the turn-off controller, and the turn-off controller comprises an alternating current power supply unit, a power supply switching unit, a charging and discharging unit, a central control unit and a turn-off unit; the input and the electric wire netting of AC power supply unit are connected, the first direct current output end of AC power supply unit is connected with the first input of power supply switching unit, the second direct current output end of AC power supply unit is connected with the input of charge and discharge unit, the output of charge and discharge unit is connected with the second input of power supply switching unit, the output and the input of central control unit of power supply switching unit are connected, the output of central control unit is connected with the input of shutoff unit, the output and the shutoff device of shutoff unit are connected, make the power generation return circuit that the shutoff device shut off photovoltaic module, prevent that photovoltaic module from breaking down, thereby reduce the loss.
Description
Technical Field
The invention relates to the technical field of photovoltaic modules, in particular to a system, a device and a method for shutting down a photovoltaic module and a readable storage medium.
Background
In a photovoltaic power station, a shutdown system is increasingly adopted to shut off a power generation loop of a component, namely in an emergency situation, because the power taking mode of the shutdown system is power grid alternating current power supply, when the voltage of a power grid drops, the shutdown system can be immediately stopped, and the shutdown system cannot control each shut-off device to disconnect the power generation loop of the component, so that the component has serious faults such as fire and the like, and the loss is large.
Disclosure of Invention
The invention mainly aims to provide a turn-off system, a turn-off device, a turn-off method and a readable storage medium of a photovoltaic module, and solves the problems that the turn-off system cannot control each turn-off device to disconnect a power generation loop of the module due to the shutdown of the turn-off system, so that the module is in failure and has large loss.
In order to achieve the above object, the present invention provides a shutdown system of a photovoltaic module, including:
the turn-off system of the photovoltaic module comprises a turn-off controller and a turn-off device connected with the turn-off controller, wherein the turn-off controller is used for controlling the turn-off device to turn off a power generation loop of the photovoltaic module;
the turn-off controller comprises an alternating current power supply unit, a power supply switching unit, a charging and discharging unit, a central control unit and a turn-off unit; the input end of the alternating current power supply unit is connected with a power grid, the first direct current output end of the alternating current power supply unit is connected with the first input end of the power supply switching unit, the second direct current output end of the alternating current power supply unit is connected with the input end of the charging and discharging unit, the output end of the charging and discharging unit is connected with the second input end of the power supply switching unit, the output end of the power supply switching unit is connected with the input end of the central control unit, the output end of the central control unit is connected with the input end of the turn-off unit, and the output end of the turn-off unit is connected with the turn-off device;
the alternating current power supply unit is connected with the central control unit, the alternating current power supply unit outputs an alternating current voltage drop signal to the central control unit, the central control unit is used for detecting that the alternating current voltage drop signal is at a low level, starting a low-voltage protection mode, detecting that the alternating current voltage drop signal is still at the low level after the low-voltage protection mode is started for a preset time, and outputting a turn-off control signal to the turn-off unit so as to pass through the turn-off unit and output the turn-off control signal to the turn-off device.
Further, the power supply switching unit includes a first diode and a second diode, the first diode is connected between the ac power supply unit and the central control unit, one end of the second diode is connected with the charging and discharging unit, and the other end of the second diode is connected between the first diode and the central control unit.
Furthermore, the charge and discharge unit comprises a charge and discharge capacitor and a current-limiting resistor, one end of the charge and discharge capacitor is connected with the alternating current power supply unit, the other end of the charge and discharge capacitor is connected with the power supply switching unit, one end of the current-limiting resistor is connected with the alternating current power supply unit, and the other end of the current-limiting resistor is connected between the charge and discharge capacitor and the power supply switching unit.
Furthermore, the system of shutting down of photovoltaic module still includes the communication dispatch unit, the communication dispatch unit connect in the central control unit.
Furthermore, the turn-off system of the photovoltaic module further comprises a data acquisition unit, and the data acquisition unit is connected to the central control unit.
Further, the turn-off system of the photovoltaic module further comprises an electric energy generation processing unit, and the electric energy generation processing unit is connected to the central control unit.
In order to achieve the above object, the present invention further provides a method for shutting down a photovoltaic module, including:
acquiring an alternating voltage drop signal of an alternating current power supply unit;
the alternating voltage drop signal is at a low level, and a low-voltage protection mode is started;
and after the low-voltage protection mode is started for a preset time, the alternating-current voltage drop signal is still at a low level, and a turn-off control signal for controlling the turn-off of the turn-off device is output.
Optionally, the step of acquiring the ac voltage drop signal of the ac power supply unit further includes:
the alternating current voltage drop signal is at a high level, and the alternating current power supply unit outputs direct current to the power supply switching unit and the charging and discharging unit.
In order to achieve the above object, the present invention further provides a shutdown device of a photovoltaic module, which includes a memory, a processor, and a shutdown program of the photovoltaic module stored in the memory and executable on the processor, and when executed by the processor, the shutdown program of the photovoltaic module implements the steps of the shutdown method of the photovoltaic module according to any one of the above embodiments.
In order to achieve the above object, the present invention further provides a readable storage medium, on which a shutdown program of a photovoltaic module is stored, and the shutdown program of the photovoltaic module, when executed by a processor, implements the steps of the shutdown method of the photovoltaic module according to any one of the above embodiments.
The invention provides a turn-off system, a turn-off device, a turn-off method and a readable storage medium of a photovoltaic module, wherein the turn-off system of the photovoltaic module comprises a turn-off controller and a turn-off device connected with the turn-off controller, and the turn-off controller is used for controlling the turn-off device to turn off a power generation loop of the photovoltaic module; the turn-off controller comprises an alternating current power supply unit, a power supply switching unit, a charging and discharging unit, a central control unit and a turn-off unit; the input end of the alternating current power supply unit is connected with a power grid, the first direct current output end of the alternating current power supply unit is connected with the first input end of the power supply switching unit, the second direct current output end of the alternating current power supply unit is connected with the input end of the charging and discharging unit, the output end of the charging and discharging unit is connected with the second input end of the power supply switching unit, the output end of the power supply switching unit is connected with the input end of the central control unit, the output end of the central control unit is connected with the input end of the turn-off unit, the output end of the turn-off unit is connected with the cut-off device, namely, the central control unit judges the level type of the alternating current drop signal to determine the type of the power grid voltage drop, when the power grid loses power, the cut-off device cuts off the power generation loop of the photovoltaic module according to the turn, thereby reducing losses.
Drawings
In order to more clearly illustrate the embodiments or exemplary technical solutions of the present invention, the drawings used in the embodiments or exemplary descriptions 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 terminal structure diagram of a hardware operating environment according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a shutdown system of a photovoltaic module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a shutdown system of a photovoltaic module according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of a first embodiment of a shutdown method of a photovoltaic module according to the present invention;
fig. 5 is a schematic flow chart of a photovoltaic module shutdown method according to a second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, fig. 1 is a schematic diagram of a hardware operating environment of a shutdown device of a photovoltaic module according to an embodiment of the present invention.
As shown in fig. 1, the shutdown device of the photovoltaic module may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display (Display), an input unit such as a Keyboard (Keyboard), a remote controller, and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (such as a non-volatile memory), such as a disk memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
It will be appreciated by those skilled in the art that the configuration of the shut-off device of the photovoltaic module shown in figure 1 does not constitute a limitation of the terminal and may comprise more or less components than those shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a storage medium, may include therein an operating system, a network communication module, a user interface module, and a shutdown program of a photovoltaic module.
In the terminal shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call a shutdown procedure of the photovoltaic module stored in the memory 1005, and perform the following operations:
acquiring an alternating voltage drop signal of an alternating current power supply unit;
the alternating voltage drop signal is at a low level, and a low-voltage protection mode is started;
and after the low-voltage protection mode is started for a preset time, the alternating-current voltage drop signal is still at a low level, and a turn-off control signal for controlling the turn-off of the turn-off device is output.
Further, the processor 1001 may call a shutdown procedure of the photovoltaic module stored in the memory 1005, and further perform the following operations:
the alternating current voltage drop signal is at a high level, and the alternating current power supply unit outputs direct current to the power supply switching unit and the charging and discharging unit.
As shown in fig. 2 to 3, the invention provides a shutdown system of a photovoltaic module.
In an embodiment, as shown in fig. 2, the shutdown system of the photovoltaic module includes a shutdown controller 10 and a shutdown device 20 connected to the shutdown controller 10, where the shutdown controller 10 is configured to control the shutdown device 20 to shut down the power generation loop of the photovoltaic module. The photovoltaic module is used for converting solar energy into electric energy and sending the electric energy to the storage battery for storage. The shutoff device 20 may be a switch, a blocking switch, or the like, and is not limited herein.
Further, the shutdown controller 10 includes an ac power supply unit 11, a power supply switching unit 12, a charging and discharging unit 13, a central control unit 14, and a shutdown unit 15. The input end of the alternating current power supply unit 11 is connected with a power grid, the first direct current output end of the alternating current power supply unit 11 is connected with the first input end of the power supply switching unit 12, the second direct current output end of the alternating current power supply unit 11 is connected with the input end of the charging and discharging unit 13, and the output end of the charging and discharging unit 13 is connected with the second input end of the power supply switching unit 12. The power grid is an external alternating current power grid, and the turn-off controller 10 obtains power through the alternating current power grid, that is, the alternating current power grid supplies alternating current to the turn-off controller through the input end of the alternating current power supply unit 11.
Optionally, the ac power supply unit 11 is further configured to convert a dc power input by a power grid into an ac power, and provide the dc power to the power supply switching unit 12 and the charging and discharging unit 13 through a first dc output end and a second dc output end of the ac power supply unit 11.
Further, the charge and discharge unit 13 includes a charged state and a discharged state. Specifically, when there is a dc input at the input end of the charging and discharging unit 13, the charging and discharging unit 13 is in a charging state, and at this time, the charging and discharging unit 13 is charged through the second dc output end of the ac power supply unit 11, and the charging and discharging unit 13 stores electric energy, and the first dc output end of the ac power supply unit 11 supplies power to the power supply switching unit 12; when no direct current is input to the input end of the charging and discharging unit 13, that is, no current is input to the alternating current power supply unit 11, the charging and discharging unit 13 is in a discharging state, and at this time, the charging and discharging unit 13 inputs the stored electric energy to the power supply switching unit 12 to supply power to the power supply switching unit 12.
Specifically, the output terminal of the power supply switching unit 12 is connected to the input terminal of the central control unit 14. When there is a grid current input at the input end of the ac power supply unit 11, the first dc input end of the ac power supply unit 11 supplies power to the power supply switching unit 12, and transmits dc power to the input end of the central control unit 14 through the power supply switching unit 12, so as to ensure the normal operation of the central control unit 14; since the second dc input terminal of the ac power supply unit 11 charges the charge/discharge unit 13 when the input terminal of the ac power supply unit 11 has the grid current input, and the charge/discharge unit 13 stores the electric energy, that is, when there is no grid current input at the input terminal of the ac power supply unit 11, the charge/discharge unit 13 discharges, at this time, the charge/discharge unit 13 inputs the stored electric energy to the power supply switching unit 12 to supply power to the power supply switching unit 12, and transmits the dc power to the input terminal of the central control unit 14 through the power supply switching unit 12, so as to ensure the normal operation of the central control unit 14. Certainly, the charging and discharging unit 13 can only store part of the electric energy, and cannot be used for replacing a battery or an electric energy, that is, in this embodiment, the charging and discharging unit 13 can only ensure that the shutdown controller operates for 3s, so that the shutdown controller 10 can still trigger the last shutdown control signal to the shutdown device 20, and the effectiveness of shutdown is ensured under an emergency condition of the whole shutdown system. However, in other embodiments, the operation time of the shutdown controller may be extended according to the performance of the charge and discharge unit 13, and is not limited herein.
Further, an output terminal of the central control unit 14 is connected to an input terminal of the shutdown unit 15, and an output terminal of the shutdown unit 15 is connected to the photo interrupter 20. The ac power supply unit 11 is connected to the central control unit 14, the ac power supply unit 11 outputs an ac voltage drop signal to the central control unit 14, the central control unit 14 is configured to detect that the ac voltage drop signal is at a low level, and start a low voltage protection mode, and at this time, the shutdown unit 15 is in a standby state. The standby state is that when the shutdown unit 15 receives a shutdown control signal from the central control unit 14, the shutdown unit 15 is triggered and sends the shutdown control signal to the shutdown device 20; when the shutdown unit 15 does not receive the shutdown control signal of the central control unit 14, the shutdown unit 15 is not triggered, and at this time, the shutdown unit 15 is in a standby state.
Further, after the low voltage protection mode is started for a preset time, it is detected that the ac voltage drop signal is still at a low level, and a turn-off control signal is output to the turn-off unit 15, so that the turn-off control signal is output to the turn-off device 20 through the turn-off unit 15, and the turn-off device 20 is connected to a power generation loop of the photovoltaic module, that is, the turn-off device 20 turns off the power generation loop of the photovoltaic module according to the turn-off control signal.
Specifically, the ac power supply unit 11 generates an ac voltage drop signal, wherein when the ac voltage drop signal is at a high level, the power grid supplies power to the central control unit 14 normally through the input terminal of the ac power supply unit 11; when the ac voltage drop signal is at a low level, no current is input to the input terminal of the ac power supply unit 11, and at this time, the shutdown controller 10 determines that the grid voltage drops. The grid voltage sag includes two situations, such as: no current is input between the input ends of the alternating current power supply unit 11 of the power grid, namely the power grid is in power failure; the shutdown controller 10 voltage is instantaneously zero, i.e., a low voltage ride through condition.
Optionally, the central control unit 14 is configured to detect whether the ac voltage drop signal is at a low level, and when the ac voltage drop signal is at the low level, start a low-voltage protection mode, that is, the charging and discharging unit 13 inputs the stored electric energy to the power supply switching unit 12 to supply power to the power supply switching unit 12, and the power supply switching unit 12 transmits the dc power to the input end of the central control unit 14, so as to ensure normal operation of the central control unit 14.
Further, since the electric energy stored in the charging and discharging unit 13 is limited, that is, after the low-voltage protection mode is started for a preset time, the central control unit 14 detects the ac voltage drop signal again, when the ac voltage drop signal is still at a low level, it is determined that the shutdown controller 10 is a power loss situation of the grid with grid voltage drop, at this time, the central control unit 14 outputs a shutdown control signal to the shutdown unit 15, so that the shutdown control signal is output to the shutdown device 20 through the shutdown unit 15, so that the shutdown device 20 shuts off the power generation loop of the photovoltaic module, thereby preventing the photovoltaic module from generating faults such as fire, and reducing loss.
Optionally, when the ac voltage drop signal is converted from a low level to a high level, it is determined that the shutdown controller 10 is in a low-voltage ride-through condition of the power grid voltage drop, and the shutdown controller 10 is controlled to exit the low-voltage protection mode, that is, after the low-voltage protection mode exits, the power grid resumes power supply, and the shutdown controller normally works, so as to ensure that the shutdown controller 10 does not have a false shutdown or a false trigger emergency stop signal to the shutdown device 20 under the low-voltage ride-through condition, thereby avoiding a shutdown misoperation of the entire shutdown system.
Alternatively, the shutdown control signal may be an emergency stop signal, which is used to emergency stop the power generation circuit of the photovoltaic module.
In the embodiment of the invention, the shutdown system of the photovoltaic module comprises a shutdown controller 10 and a shutdown device 20 connected with the shutdown controller 10, wherein the shutdown controller 10 is used for controlling the shutdown device 20 to shut down a power generation loop of the photovoltaic module; the shutdown controller 10 includes an ac power supply unit 11, a power supply switching unit 12, a charging and discharging unit 13, a central control unit 14, and a shutdown unit 15; the input end of the ac power supply unit 11 is connected to a power grid, the first dc output end of the ac power supply unit 11 is connected to the first input end of the power supply switching unit 12, the second dc output end of the ac power supply unit 11 is connected to the input end of the charge and discharge unit 13, the output end of the charge and discharge unit 13 is connected to the second input end of the power supply switching unit 12, the output end of the power supply switching unit 12 is connected to the input end of the central control unit 14, the output end of the central control unit 14 is connected to the input end of the shutdown unit 15, and the output end of the shutdown unit 15 is connected to the shutdown device 20; wherein, the ac power supply unit 11 is connected to the central control unit 14, the ac power supply unit 11 outputs an ac voltage drop signal to the central control unit 4, the central control unit 14 is configured to detect that the ac voltage drop signal is at a low level, start a low voltage protection mode, detect that the ac voltage drop signal is still at the low level after the low voltage protection mode is started for a preset time, output a shutdown control signal to the shutdown unit 15, so as to output the shutdown control signal to the shutdown device 20 through the shutdown unit 15, that is, judge the level type of the ac drop signal through the central control unit 14, so as to determine the type of the grid voltage drop, when the grid is powered off, the shutdown device 20 shuts off the power generation loop of the photovoltaic module according to the shutdown control signal, so as to prevent the photovoltaic module from faults such as fire and the like, thereby reducing losses.
Further, as shown in fig. 3, the power supply switching unit 12 includes a first diode D1 and a second diode D2, the first diode D1 is connected between the ac power supply unit 11 and the central control unit 14, one end of the second diode D2 is connected to the charging and discharging unit 13, and the other end of the second diode D2 is connected between the first diode D1 and the central control unit 14.
Optionally, the first diode D1 and the second diode D2 are on-off diodes.
Specifically, when the ac power supply unit 11 has a current input, the first diode D1 is in an on state, so that the ac power supply unit 11 supplies power to the power supply switching unit 12 and the central control unit 14, at this time, the second diode D2 is in an off state, the charging and discharging unit 13 is in a charging state, and the charging and discharging unit 13 is not in communication with the power supply switching unit 12; when no current is input to the ac power supply unit 11, the first diode D1 is in an off state, the ac power supply unit 11 is not connected to the power supply switching unit 12, at this time, the second diode D2 is in an on state, and the charging/discharging capacitor C is in a discharging state, at this time, the electric energy stored by the charging/discharging capacitor C is transmitted to the power supply switching unit 12 to supply power to the central control unit 14.
Further, as shown in fig. 3, the charging and discharging unit 13 includes a charging and discharging capacitor C and a current limiting resistor R, one end of the charging and discharging capacitor C is connected to the ac power supply unit 11, the other end of the charging and discharging capacitor C is connected to the power supply switching unit 12, one end of the current limiting resistor R is connected to the ac power supply unit 11, and the other end of the current limiting resistor R is connected between the charging and discharging capacitor C and the power supply switching unit 12. When current is input into the ac power supply unit 11, the charging/discharging capacitor C is in a charging state, that is, the charging/discharging capacitor C is charged by the dc power input from the ac power supply unit 11, and stores electric energy; when no current is input into the ac power supply unit 11, the charging/discharging capacitor C is in a discharging state, and at this time, since no current is input into the entire shutdown controller 10, the stored electric energy is transmitted to the power supply switching unit 12 through the charging/discharging capacitor C, so as to supply power to the central control unit 14. The current limiting resistor R is used for limiting current so as to prevent the charge and discharge capacitor C from being broken down due to overlarge voltage when the current changes instantaneously.
Further, as shown in fig. 2 or 3, the shutdown system of the photovoltaic module further includes a communication scheduling unit 16, and the communication scheduling unit 16 is connected to the central control unit 14. Since the shutdown controller 10 supports serial communication with a monitoring center, serial communication with a down-hanging inverter, and electromagnetic communication with all shutdown devices, that is, the communication scheduling unit 16 is used for priority of the central control unit 14 in communication with the monitoring center, the down-hanging inverter, and the down-hanging shutdown device, so as to ensure normal communication of the shutdown controller.
Further, as shown in fig. 2 or 3, the shutdown system of the photovoltaic module further includes a data acquisition unit 17, the data acquisition unit 17 is connected to the central control unit 14, and the data acquisition unit 17 is configured to acquire various types of remote signaling and telemetry data of the monitoring center, the lower-mounted inverter, and the lower-mounted shutdown device in real time, perform preliminary analysis and processing, and output the data to the central control unit 14. The photovoltaic module turn-off system further comprises a power generation processing unit 18, the power generation processing unit 18 is connected to the central control unit 14, and the power generation processing unit 18 is used for carrying out real-time statistical processing calculation on the telemetering data acquired by the data acquisition unit 17 to obtain accurate power generation and power values of the photovoltaic module and outputting the accurate power generation and power values to the central control unit 14.
Optionally, the data acquisition unit 17 is further configured to perform packet processing on the data output from the power generation processing unit 18 and report the processed data to an upper monitoring center, so as to monitor the power generation amount and the power value of the photovoltaic module in real time.
Further, when the shutdown controller 10 is in the low-voltage protection mode, the communication scheduling unit 16, the data acquisition unit 17, and the power generation amount processing unit 18 are in the sleep state, and the shutdown unit 15 is in the standby state. Namely, the sleep state is that the communication scheduling unit 16, the data acquisition unit 17 and the generated energy processing unit 18 are in the non-working state, and at this time, only the shutdown controller 10 exits the low-voltage protection mode, and the communication scheduling unit 16, the data acquisition unit 17 and the generated energy processing unit 18 recover to work normally.
In the embodiment of the invention, the shutdown system of the photovoltaic module comprises a shutdown controller 10 and a shutdown device 20 connected with the shutdown controller 10, wherein the shutdown controller 10 is used for controlling the shutdown device 20 to shut down a power generation loop of the photovoltaic module; the shutdown controller 10 includes an ac power supply unit 11, a power supply switching unit 12, a charging and discharging unit 13, a central control unit 14, and a shutdown unit 15; the input end of the ac power supply unit 11 is connected to a power grid, the first dc output end of the ac power supply unit 11 is connected to the first input end of the power supply switching unit 12, the second dc output end of the ac power supply unit 11 is connected to the input end of the charge and discharge unit 13, the output end of the charge and discharge unit 13 is connected to the second input end of the power supply switching unit 12, the output end of the power supply switching unit 12 is connected to the input end of the central control unit 14, the output end of the central control unit 14 is connected to the input end of the shutdown unit 15, and the output end of the shutdown unit 15 is connected to the shutdown device 20; wherein, the ac power supply unit 11 is connected to the central control unit 14, the ac power supply unit 11 outputs an ac voltage drop signal to the central control unit 4, the central control unit 14 is configured to detect that the ac voltage drop signal is at a low level, start a low voltage protection mode, detect that the ac voltage drop signal is still at the low level after the low voltage protection mode is started for a preset time, output a shutdown control signal to the shutdown unit 15, so as to output the shutdown control signal to the shutdown device 20 through the shutdown unit 15, that is, judge the level type of the ac drop signal through the central control unit 14, so as to determine the type of the grid voltage drop, when the grid is powered off, the shutdown device 20 shuts off the power generation loop of the photovoltaic module according to the shutdown control signal, so as to prevent the photovoltaic module from faults such as fire and the like, thereby reducing losses.
Based on the embodiment, the invention further provides a switching-off method of the photovoltaic module.
As shown in fig. 4, a schematic flow chart of steps of a first embodiment of a shutdown method of a photovoltaic module according to the present invention is provided, and specifically, the shutdown method of the photovoltaic module includes:
s1, acquiring an alternating voltage drop signal of the alternating current power supply unit;
s2, the alternating voltage drop signal is at low level, and a low-voltage protection mode is started;
and S3, after the low-voltage protection mode is started for a preset time, if the alternating-current voltage drop signal is still at a low level, outputting a turn-off control signal for controlling the turn-off of the turn-off device.
In one embodiment, the turn-off controller is connected to the turn-off device, and the turn-off controller is configured to control the turn-off device to turn off the power generation loop of the photovoltaic module. The photovoltaic module is used for converting solar energy into electric energy and sending the electric energy to the storage battery for storage. The shutoff device may be a switch, a blocking switch, or the like, and is not limited herein. The turn-off controller comprises an alternating current power supply unit, a power supply switching unit, a charging and discharging unit, a central control unit and a turn-off unit.
Further, the turn-off controller comprises an alternating current power supply unit, a power supply switching unit, a charging and discharging unit, a central control unit and a turn-off unit. Specifically, the input of alternating current power supply unit is connected with the electric wire netting, alternating current power supply unit's first direct current output with power supply switching unit's first input is connected, alternating current power supply unit's second direct current output with charge and discharge unit's input is connected, charge and discharge unit's output with power supply switching unit's second input is connected, power supply switching unit's output with central control unit's input is connected, central control unit's output with turn-off unit's input is connected, turn-off unit's output with turn-off device is connected, alternating current power supply unit with central control unit connects.
Further, an alternating voltage drop signal of the alternating current power supply unit is obtained. Wherein the ac voltage droop signal may include a high level and a low level; when the alternating voltage drop signal is at a high level, the power grid normally supplies power to the central control unit through the input end of the alternating current power supply unit; when the alternating voltage drop signal is at a low level, no current is input to the input end of the alternating current power supply unit, and at the moment, the turn-off controller judges that the power grid voltage drops. The grid voltage sag includes two situations, such as: no current input exists between the input ends of the alternating current power supply units of the power grid, namely the power grid loses power; the voltage of the turn-off controller is zero instantly, namely under the condition of low-voltage ride through.
Further, the central control unit is configured to detect a level type of the ac voltage drop signal, where the ac voltage drop signal is at a low level, and start a low voltage protection mode. The low-voltage protection mode is to input the stored electric energy to the power supply switching unit through the charging and discharging unit so as to supply power to the power supply switching unit, and transmit the direct current to the input end of the central control unit through the power supply switching unit so as to ensure the normal work of the central control unit.
Further, when the turn-off controller is in a low-voltage protection mode, the communication scheduling unit, the data acquisition unit and the power generation processing unit are in a dormant state, and the turn-off unit is in a standby state. Namely, the sleep state is that the communication scheduling unit, the data acquisition unit and the generated energy processing unit 18 are in a non-working state, and at this time, only the turn-off controller exits the low-voltage protection mode, and the communication scheduling unit, the data acquisition unit and the generated energy processing unit recover to work normally.
Further, the standby state is that when the shutdown unit receives a shutdown control signal of the central control unit, the shutdown unit is triggered and sends the shutdown control signal to the shutdown device; when the turn-off unit does not receive the turn-off control signal of the central control unit, the turn-off unit is not triggered, and at the moment, the turn-off unit is in a standby state.
Further, after the low-voltage protection mode is started for a preset time, the alternating-current voltage drop signal is still at a low level, and then a turn-off control signal for controlling the turn-off of the turn-off device is output. Specifically, because the electric energy that the charge and discharge unit stored is limited, namely after the low voltage protection mode is opened for a preset duration, the central control unit detects the ac voltage drop signal again, when the ac voltage drop signal is still at a low level, it is determined that the turn-off controller is the power grid power loss condition of the power grid voltage drop, at this moment, the central control unit outputs a turn-off control signal to the turn-off unit, so as to output the turn-off control signal to the turn-off device through the turn-off unit, so that the turn-off device turns off the power generation loop of the photovoltaic module, and the photovoltaic module is prevented from generating faults such as fire, and the loss is reduced.
Optionally, when the electric energy stored in the charging and discharging unit is limited, that is, the shutdown controller can be guaranteed to operate for 3s on the premise that the voltage of the power grid drops, and the preset time duration may be set to 2.5 s. Namely, when the starting time of the low-voltage protection mode reaches 2.5s, the alternating voltage drop signal is judged again, so that whether the power grid voltage drop is the power grid power loss condition or the low-voltage ride-through condition is further confirmed. When the alternating voltage drop signal is still at a low level, judging that the power grid power loss condition of the grid voltage drop is the power grid power loss condition of the grid voltage drop by the turn-off controller, and outputting a turn-off control signal to a turn-off device so as to turn off a power generation loop of the photovoltaic module; when the alternating voltage drop signal is converted from low level to high level, the turn-off controller is judged to be the low-voltage ride-through condition of the power grid voltage drop, the turn-off controller is controlled to exit the low-voltage protection mode, namely after the low-voltage protection mode exits, the power grid returns to supply power, and the turn-off controller works normally. Alternatively, the shutdown control signal may be an emergency stop signal, which is used to emergency stop the power generation circuit of the photovoltaic module.
In an embodiment of the present invention, the method for turning off the photovoltaic module includes the following steps: acquiring an alternating voltage drop signal of an alternating current power supply unit; the alternating voltage drop signal is at a low level, and a low-voltage protection mode is started; after the low-voltage protection mode is started for a preset time, the alternating voltage drop signal is still at a low level, a turn-off control signal for controlling the turn-off of the turn-off device is output, namely, the level type of the alternating voltage drop signal is judged by the central control unit to determine the type of the grid voltage drop, and when the power grid loses power, the turn-off device turns off a power generation loop of the photovoltaic module according to the turn-off control signal to prevent the photovoltaic module from generating faults such as fire and the like, so that the loss is reduced.
Based on the first embodiment of the shutdown method of the photovoltaic module of the present invention, the present invention provides the second embodiment of the shutdown method of the photovoltaic module, and as shown in fig. 5, the shutdown method of the photovoltaic module includes:
and S4, the alternating current voltage drop signal is at a high level, and the alternating current power supply unit outputs direct current to the power supply switching unit and the charging and discharging unit.
In an embodiment, the central control unit is configured to detect a level type of the ac voltage drop signal, and when the ac voltage drop signal is at a high level, the power grid supplies power to the entire shutdown controller to ensure normal operation of the shutdown controller.
Specifically, the power grid provides alternating current to the alternating current power supply unit, the alternating current power supply unit converts the alternating current into direct current and outputs the direct current to the power supply switching unit and the charging and discharging unit respectively, and when the alternating current power supply unit outputs the direct current to the power supply switching unit, the direct current can be transmitted to the central control unit through the power supply switching unit, so that the central control unit keeps normal operation, namely, a shutdown controller works normally; the charge/discharge unit may be charged when output to the charge/discharge unit. The power supply switching unit is not communicated with the charging and discharging unit, and the charging and discharging unit stores charging electric energy.
The invention also provides a shutdown device of a photovoltaic module, which comprises a memory, a processor and a shutdown program of the photovoltaic module, wherein the shutdown program of the photovoltaic module is stored on the memory and can run on the processor, and when being executed by the processor, the shutdown program of the photovoltaic module realizes the steps of the shutdown method of the photovoltaic module according to any one of the above embodiments.
The invention also proposes a readable storage medium on which a shut-down program of a photovoltaic module is stored, which, when executed by a processor, implements the steps of the shut-down method of a photovoltaic module according to any of the above embodiments.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be substantially or partially embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g., a mobile phone, a computer, a cloud server, or a network device) to execute the method of the embodiments of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The turn-off system of the photovoltaic module is characterized by comprising a turn-off controller and a turn-off device connected with the turn-off controller, wherein the turn-off controller is used for controlling the turn-off device to turn off a power generation loop of the photovoltaic module;
the turn-off controller comprises an alternating current power supply unit, a power supply switching unit, a charging and discharging unit, a central control unit and a turn-off unit; the input end of the alternating current power supply unit is connected with a power grid, the first direct current output end of the alternating current power supply unit is connected with the first input end of the power supply switching unit, the second direct current output end of the alternating current power supply unit is connected with the input end of the charging and discharging unit, the output end of the charging and discharging unit is connected with the second input end of the power supply switching unit, the output end of the power supply switching unit is connected with the input end of the central control unit, the output end of the central control unit is connected with the input end of the turn-off unit, and the output end of the turn-off unit is connected with the turn-off device;
the alternating current power supply unit is connected with the central control unit, the alternating current power supply unit outputs an alternating current voltage drop signal to the central control unit, the central control unit is used for detecting that the alternating current voltage drop signal is at a low level, starting a low-voltage protection mode, detecting that the alternating current voltage drop signal is still at the low level after the low-voltage protection mode is started for a preset time, and outputting a turn-off control signal to the turn-off unit so as to pass through the turn-off unit and output the turn-off control signal to the turn-off device.
2. A turn-off system of a photovoltaic module according to claim 1, wherein the power supply switching unit includes a first diode and a second diode, the first diode is connected between the ac power supply unit and the central control unit, one end of the second diode is connected with the charging and discharging unit, and the other end of the second diode is connected between the first diode and the central control unit.
3. A turn-off system of a photovoltaic module according to claim 1, wherein the charging and discharging unit includes a charging and discharging capacitor and a current limiting resistor, one end of the charging and discharging capacitor is connected to the ac power supply unit, the other end of the charging and discharging capacitor is connected to the power supply switching unit, one end of the current limiting resistor is connected to the ac power supply unit, and the other end of the current limiting resistor is connected between the charging and discharging capacitor and the power supply switching unit.
4. A shutdown system for a photovoltaic module as claimed in claim 1, further comprising a communication dispatch unit, said communication dispatch unit being connected to said central control unit.
5. A shutdown system for a photovoltaic module as claimed in claim 1, further comprising a data acquisition unit connected to the central control unit.
6. A shutdown system for a photovoltaic module as claimed in claim 1, further comprising an electrical power generation processing unit connected to the central control unit.
7. A method for shutting down a photovoltaic module, the method comprising:
acquiring an alternating voltage drop signal of an alternating current power supply unit;
the alternating voltage drop signal is at a low level, and a low-voltage protection mode is started;
and after the low-voltage protection mode is started for a preset time, the alternating-current voltage drop signal is still at a low level, and a turn-off control signal for controlling the turn-off of the turn-off device is output.
8. A method for shutting down a photovoltaic module according to claim 7, wherein the step of obtaining an AC voltage sag signal of an AC power supply unit is followed by further comprising:
the alternating current voltage drop signal is at a high level, and the alternating current power supply unit outputs direct current to the power supply switching unit and the charging and discharging unit.
9. A shut-down device of a photovoltaic module, characterized in that the shut-down device of the photovoltaic module comprises a memory, a processor and a shut-down program of the photovoltaic module stored on the memory and operable on the processor, wherein the shut-down program of the photovoltaic module, when executed by the processor, implements the steps of the shut-down method of the photovoltaic module according to any one of claims 7-8.
10. Readable storage medium, on which a shutdown program of a photovoltaic module is stored, which, when executed by a processor, implements the steps of the shutdown method of a photovoltaic module according to any one of claims 7 to 8.
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