阅读说明：本技术 一种光伏系统及切换光伏系统的输出状态的方法 (Photovoltaic system and method for switching output state of photovoltaic system ) 是由 邓士锋 董经兵 刘亚锋 邢国强 于 2018-08-31 设计创作，主要内容包括：本申请提供一种光伏系统及切换光伏系统的输出状态的方法,所述光伏系统包括发射器和若干光伏子系统,其中：每个光伏子系统包括传达器、若干光伏组件和若干接收器；发射器用于发送关断或打开光伏组件的通讯信号；传达器均与发射器连接,用于传递发射器发送的通讯信号；接收器与光伏组件一一对应连接,用于接收传达器传递的通讯信号,根据通讯信号改变光伏组件的输出状态。采用本申请的技术方案,当光伏子系统中的光伏电站发生安全问题如火灾时,可通过发射器发送通讯信号,进而控制与接收器连接的光伏组件的输出状态,如此,便可通过对发射器进行操作,进而及时切换光伏系统的输出状态,从而在保障相关人员的人身安全的前提下完成作业。(The application provides a photovoltaic system and a method for switching output states of the photovoltaic system, the photovoltaic system comprises an emitter and a plurality of photovoltaic subsystems, wherein: each photovoltaic subsystem comprises a transmitter, a plurality of photovoltaic components and a plurality of receivers; the emitter is used for sending a communication signal for turning off or turning on the photovoltaic module; the transmitters are connected with the transmitters and are used for transmitting communication signals sent by the transmitters; the receiver is connected with the photovoltaic modules in a one-to-one correspondence mode and used for receiving the communication signals transmitted by the transmitter and changing the output states of the photovoltaic modules according to the communication signals. Adopt the technical scheme of this application, when photovoltaic power plant in the photovoltaic subsystem takes place safety problem like the conflagration, communication signal is sent to the accessible transmitter, and then the control is connected with the receiver photovoltaic module's output state, so, alright through operating the transmitter, and then in time switch photovoltaic system's output state to accomplish the operation under the prerequisite of guarantee relevant personnel's personal safety.)

1. A photovoltaic system comprising an emitter and a plurality of photovoltaic subsystems, characterized in that:

each photovoltaic subsystem comprises a transmitter, a plurality of photovoltaic components and a plurality of receivers;

the transmitter is used for transmitting a communication signal for turning off or turning on the photovoltaic module;

the transmitters are connected with the transmitter and are used for transmitting the communication signals sent by the transmitter;

the receiver is connected with the photovoltaic modules in a one-to-one correspondence mode and used for receiving the communication signals transmitted by the transmitter and changing the output states of the photovoltaic modules according to the communication signals.

2. The photovoltaic system of claim 1, wherein the emitter is a manual switching device or an automatic switching device.

3. The photovoltaic system of claim 1, further comprising:

and the inverter is connected with the transmitter and is used for converting the direct current signal provided by the photovoltaic module into an alternating current signal so as to be connected to the mains supply in a grid mode.

4. The pv system of claim 1 wherein the pv subsystem comprises an array of pv strings, the array comprising a plurality of strings of pv modules connected in parallel, each string comprising a plurality of the pv modules connected in series.

5. The photovoltaic system of claim 1, wherein the communicator comprises a control circuit and a signal modulation circuit, wherein:

the control circuit is connected with the transmitter and used for receiving the communication signal sent by the transmitter;

and the signal modulation circuit is used for modulating the communication signal into a carrier signal to be transmitted in a carrier form.

6. The photovoltaic system of claim 1, wherein the receiver comprises an auxiliary power circuit and a communication control circuit, wherein:

a coupling voltage circuit for receiving a carrier signal transmitted by the transmitter in the form of a carrier wave;

and the communication control circuit is used for controlling the switch state of the receiver according to the carrier signal received by the coupling voltage circuit.

7. The photovoltaic system of claim 1, wherein the transmitter and the communicator are connected by an RS-485 cable.

8. The pv system of any one of claims 1-7 wherein the emitter 11 comprises a display module for displaying whether the pv module is in a normal output state.

9. The photovoltaic system of claim 8,

when the state of the photovoltaic assembly displayed by the display module is a normal output state, the transmitter transmits a stop permission working signal to the photovoltaic assembly;

when the state of the photovoltaic system displayed by the display module is an abnormal output state, the transmitter transmits an allowable working signal to the photovoltaic assembly.

10. A method of switching an output state of a photovoltaic system, comprising:

the emitter sends a communication signal for turning off or turning on the photovoltaic module;

the transmitter is used for transmitting a communication signal to the transmitter;

the receiver receives the communication signal transmitted by the transmitter, and the output state of the photovoltaic modules connected with the receiver in a one-to-one correspondence mode is determined according to the communication signal.

Technical Field

The application relates to the technical field of photovoltaic systems, in particular to a photovoltaic system and a method for switching output states of the photovoltaic system.

Background

Due to the rapid development of photovoltaic module technology and the rapid increase of the demand of the market on photovoltaic modules, solar photovoltaic power stations distributed in global areas are produced, and the demand of the market is met to a certain extent. However, as the number of solar photovoltaic power stations increases, the safety problem of the solar photovoltaic power stations becomes a troublesome problem. For example, when a photovoltaic power station is in a fire due to the safety problem of the solar photovoltaic power station, the voltage of the photovoltaic module system is large and sometimes even reaches 1500V, so that a great deal of inconvenience is brought to fire fighting of fire fighters, the safe and reliable method is to rapidly reduce the voltage to be within a safe voltage range, so that fire fighting can be performed under the condition of ensuring the personal safety of the fire fighters, and the photovoltaic system is rapidly turned off to rapidly reduce the effective prevention of the solar photovoltaic power station. However, fast turn-off photovoltaic systems are still a gap in the market.

To sum up, the photovoltaic system that intelligence was turned off fast lacks in the prior art scheme.

Disclosure of Invention

The embodiment of the application provides a photovoltaic system and a method for switching output states of the photovoltaic system, so that a photovoltaic power station can be quickly turned off when encountering a safety problem.

According to the embodiment of the application, a photovoltaic system is provided, which comprises an emitter and a plurality of photovoltaic subsystems, wherein:

each photovoltaic subsystem comprises a transmitter, a plurality of photovoltaic components and a plurality of receivers;

the transmitter is used for transmitting a communication signal for turning off or turning on the photovoltaic module;

the transmitters are connected with the transmitter and are used for transmitting the communication signals sent by the transmitter;

the receiver is connected with the photovoltaic modules in a one-to-one correspondence mode and used for receiving the communication signals transmitted by the transmitter and changing the output states of the photovoltaic modules according to the communication signals.

In one embodiment, the transmitter is a manual switching device or an automatic switching device.

In one embodiment, further comprising:

and the inverter is connected with the transmitter and is used for converting the direct current signal provided by the photovoltaic module into an alternating current signal so as to be connected to the mains supply in a grid mode.

In one embodiment, the photovoltaic subsystem includes a photovoltaic module string array including a plurality of parallel photovoltaic module strings, each photovoltaic module string including a plurality of series photovoltaic modules.

In one embodiment, the communicator includes a control circuit and a signal modulation circuit, wherein:

the control circuit is connected with the transmitter and used for receiving the communication signal sent by the transmitter;

and the signal modulation circuit is used for modulating the communication signal into a carrier signal to be transmitted in a carrier form.

In one embodiment, the receiver includes an auxiliary power supply circuit and a communication control circuit, wherein:

a coupling voltage circuit for receiving a carrier signal transmitted by the transmitter in the form of a carrier wave;

and the communication control circuit is used for controlling the switch state of the receiver according to the carrier signal received by the coupling voltage circuit.

In one embodiment, the transmitter and the communicator are connected by an RS-485 cable.

In one embodiment, the transmitter includes a display module for displaying whether the photovoltaic module is in a normal output state.

In one embodiment of the present invention,

when the state of the photovoltaic assembly displayed by the display module is a normal output state, the transmitter transmits a stop permission working signal to the photovoltaic assembly;

when the state of the photovoltaic assembly displayed by the display module is an abnormal output state, the transmitter transmits an allowable working signal to the photovoltaic assembly.

According to the method for switching the output state of the photovoltaic system, provided by the embodiment of the application, the method comprises the following steps:

the emitter sends a communication signal for turning off or turning on the photovoltaic module;

the transmitter is used for transmitting a communication signal to the transmitter;

the receiver receives the communication signal transmitted by the transmitter, and the output state of the photovoltaic modules connected with the receiver in a one-to-one correspondence mode is determined according to the communication signal.

The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:

the photovoltaic system and the method of switching photovoltaic system's state that this application embodiment provided, when photovoltaic power plant takes place safety problem when the conflagration, can send communication signal through the transmitter, the communicator will communication signal sends away with the form of carrier wave, and the receiver adopts the form of carrier wave to receive carrier wave signal, the communication control circuit of receiver are according to the conducting state of received carrier wave signal change-over switch subassembly, and then control photovoltaic module's that is connected with the receiver output voltage, electric current, so, alright through operating the transmitter, and then in time switch photovoltaic system's output state, and then accomplish the operation under the prerequisite of guarantee relevant personnel's personal safety.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic mechanical diagram of a photovoltaic system in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a transmitter according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a receiver according to an embodiment of the present application;

FIG. 4 is a schematic mechanical diagram of another photovoltaic system according to an embodiment of the present disclosure;

fig. 5 is a flowchart of a method for switching an output state of a photovoltaic system in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, 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 application.

Referring to fig. 1, the present application provides a photovoltaic system comprising an emitter 11 and a number of photovoltaic subsystems. Each photovoltaic subsystem may include a transmitter 12, a string array 13 of photovoltaic modules, and the string array 13 of photovoltaic modules includes a plurality of photovoltaic modules 14 and a plurality of receivers 15. Wherein, the photovoltaic modules 14 are connected with the receivers 15 in a one-to-one correspondence manner. The transmitter 11 is used for sending a communication signal for turning off or turning on the photovoltaic module 14, the transmitter 12 is connected with the transmitter 11 and used for transmitting the communication signal sent by the transmitter 11, and the receiver 15 is used for receiving the communication signal transmitted by the transmitter 12 and further changing the output state of the photovoltaic module 14 according to the communication signal.

Specifically, in the embodiment of the present application, if the photovoltaic module 14 is in the normal output state, when the transmitter 11 sends the communication signal "off", the state of the photovoltaic module 14 will be changed to "abnormal output" after being transmitted to the receiver 15 through the transmitter 12; when the photovoltaic module 14 is in the "abnormal output" state, the transmitter 11 may send a communication signal "on", and after the communication signal is transmitted to the receiver 15 by the transmitter 12, the state of the photovoltaic module 14 connected to the receiver 15 is changed to the "normal output" state.

In the embodiment of the present application, one transmitter 12 is taken as an example for explanation, and one transmitter 12 corresponds to one photovoltaic module string array 13. Accordingly, when the photovoltaic system includes a plurality of photovoltaic subsystems, a plurality of transmitters 12 may be included, each transmitter 12 corresponds to one photovoltaic module string array 13, and the transmitters 12 are connected in parallel with each other, so that the communication signals transmitted by the transmitter 11 can be simultaneously received and transmitted by the plurality of transmitters 12, and thus, the plurality of photovoltaic module string arrays 13 can be simultaneously controlled.

In the embodiment of the present application, the transmitter 11 is a manual switching device or an automatic switching device. As a specific example, the manual switch device is a push switch, and the communication signal can be sent by pushing a switch button, and if the photovoltaic module 14 is currently in a normal output state, the normal output state of the photovoltaic module 14 can be closed by pushing the switch button and then sending a "closing" communication signal. When the transmitter 11 is an automatic switch device, the automatic switch device can be set to automatically switch off when a fire disaster causes a circuit to have faults such as severe overload, short circuit, and voltage loss, so as to switch the output state of the photovoltaic module 14. When the photovoltaic module 14 is in the "abnormal output" state, it is possible to detect whether there is a fault such as a severe overload, a short circuit, and a voltage loss in the circuit, and if not, automatically send an "open" communication signal, and transmit the communication signal to the receiver 15 through the transmitter 12, so that the photovoltaic module 14 is switched from the "abnormal output" state to the "normal output" state.

In the embodiment of the present application, the photovoltaic system further includes an inverter 17, and the inverter 17 is connected to the transmitter 12, and is configured to invert the electric energy in the form of direct current provided by the photovoltaic module 14 into electric energy in the form of alternating current, so as to grid the utility power or supply power to the electric device. Alternatively, the transmitter 12 may be provided inside or outside the inverter 17, and only the following requirements need to be satisfied:

1) each of the transmitters 12 is connected in series with the inverter 17;

2) the transmitters 12 are connected in parallel;

with such arrangement, the direct current signal provided by the photovoltaic module 14 in the photovoltaic module string array 13 corresponding to each transmitter 12 can be converted into an alternating current signal through the inverter 17, and then provided to the electric equipment or grid-connected commercial power; in addition, the communication signal sent by the transmitter 11 can be received by each transmitter 12 and then transmitted to the receiver 15 connected thereto, so as to switch the state of the photovoltaic module 14 in each photovoltaic module string array 13.

In the present embodiment, each photovoltaic module string array 13 includes a plurality of parallel photovoltaic module strings, and each photovoltaic module string includes a plurality of series photovoltaic modules 14.

As a preferred embodiment, the photovoltaic module string array 13 includes 1 to 10 photovoltaic module strings, and each photovoltaic module string includes 6 to 30 photovoltaic modules 14. The specific connection mode of series connection between the photovoltaic modules 14 is as follows: the receiver 15 corresponding to one photovoltaic module 14 is connected to another photovoltaic module 14. The specific connection mode of the parallel connection between the photovoltaic modules 14 is as follows: the corresponding receiver 15 of the photovoltaic module 14 is connected.

In the embodiment of the present application, referring to fig. 2, the transmitter 12 includes a control circuit connected to the transmitter 11 for receiving the communication signal sent by the transmitter 11, and a signal modulation circuit for modulating the communication signal received by the control circuit into a carrier signal for transmitting to the receiver 15. The transmitter 12 further includes a power circuit for supplying a stable voltage to the transmitter 12 and a voltage detection module for detecting a voltage from an output of the receiver 15. Further, the power circuit includes a power adapter for supplying a voltage suitable for the transmitter 12 and supplying the voltage suitable for the transmitter 12 to the power interface, a power interface, and an auxiliary power circuit for supplying a stable voltage to the transmitter 12 when the power interface, the power adapter, or a connected commercial power fails to supply power.

Referring to fig. 3, in the embodiment of the present application, the receiver 15 includes a coupling transformer circuit for remotely receiving the carrier signal transmitted by the transmitter 12, and a communication control circuit for controlling the on-state of the receiver 15 according to the received carrier signal, such as controlling a switch device to control the on-state of the receiver 15. In addition, the receiver 15 further includes an auxiliary power circuit connected to the communication control circuit as a backup power source for the communication control circuit to supply power to the communication control circuit when the photovoltaic module 14 is outputting abnormally.

In the embodiment of the present application, the switching device of the receiver 15 may directly cause whether the voltage of the photovoltaic module 14 connected to the receiver 15 can be normally output, as shown in the figure, when the remotely transmitted carrier signal received by the coupling transformer is "off", the "off" communication signal is transmitted to the communication control circuit, the communication control circuit controls the switching component of the receiver 15 to be off, so that the input end and the output end of the receiver 15 are not connected, and the electric energy generated by the photovoltaic module 14 connected to the receiver 15 cannot be transmitted through the receiver 15.

In the embodiment of the present application, the transmitter 12 also includes an input and an output, wherein the input of the transmitter 12 is connected to the output of the receiver 15 to receive the electric energy (generated by the photovoltaic module 14 connected to the receiver 15) transmitted by the receiver 15, and the output of the transmitter 12 is connected to an inverter 17 to connect the received electric energy to the mains.

In the embodiment of the present application, the transmitter 12 further includes an adapter, a power interface and an auxiliary power supply, wherein the adapter can be connected to the commercial power for converting the commercial power into a voltage suitable for the transmitter 12 and providing the voltage to the power interface of the transmitter 12; meanwhile, the transmitter 12 further includes an auxiliary power circuit for providing power to the receiver 15 when the power cannot be obtained from the commercial power, so as to provide a stable voltage, thereby satisfying the power supply requirement of the transmitter 12.

According to the photovoltaic system provided by the embodiment of the application, after the receiver 15 receives the carrier signal transmitted remotely, the on state of the switch component of the receiver 15 is switched according to the carrier signal, and then the electric energy supply state of the photovoltaic component 14 is switched, so that the technical effect of rapid switching-off when the photovoltaic power station encounters a safety problem is achieved.

Since the RS-485 serial cable is widely used when the communication distance is required to be several tens of meters to several kilometers. Therefore, in the embodiment of the present application, the transmitter 11 and the transmitter 12 are connected by RS-485 cable, and the transmitter 11 and the transmitter 12 can be arranged at a relatively long distance, so that when a safety problem occurs in a photovoltaic power station, the transmitter 11 can be operated in a safe range, and the photovoltaic module 14 can be remotely controlled to adjust the output voltage and current of the photovoltaic module.

In the embodiment of the present application, the transmitter 11 may include a display module for displaying whether the photovoltaic module 14 is in a normal output state or an abnormal output state.

In the embodiment of the application, when the state of the photovoltaic module displayed by the display module is a normal output state, the transmitter 12 transmits a stop permission operation signal to the photovoltaic module 14; when the state of the photovoltaic module 14 displayed by the display module is an abnormal output state, the transmitter 12 transmits an operation permission signal to the photovoltaic module 14.

The photovoltaic system that this application embodiment provided, through emitter 11 transmission communication signal, transmitter 12 will communication signal conveys with the form of carrier wave, and after receiver 15 received carrier wave signal, according to communication signal controller conducting state, and then control the electric energy supply state with photovoltaic module 14 that receiver 15 is connected. Therefore, when a safety problem occurs in the photovoltaic power station, the transmitter 11 sends a communication signal to timely shut down the power supply state of the photovoltaic module 14, so that relevant personnel can perform relevant operations within a safe voltage range.