CN222147147U

CN222147147U - Power generation system

Info

Publication number: CN222147147U
Application number: CN202420101428.4U
Authority: CN
Inventors: 郑威; 孙中伟; 于华君; 朱彦君
Original assignee: Shenzhen Hello Tech Energy Co Ltd
Current assignee: Shenzhen Hello Tech Energy Co Ltd
Priority date: 2024-01-15
Filing date: 2024-01-15
Publication date: 2024-12-10
Anticipated expiration: 2034-01-15

Abstract

The present application provides a power generation system, including at least two power generation components and at least two disconnectors, each disconnector is electrically connected to the positive terminal and the negative terminal of the corresponding power generation component, and each disconnector is also directly or indirectly electrically connected to a DC bus, so that the DC bus is connected to the corresponding power generation component through the corresponding disconnector, and each disconnector is used to conduct or disconnect the electrical connection between the corresponding power generation component and the DC bus. Therefore, the power generation system provided by the present application can quickly reduce the DC side voltage of the power generation system when the power generation system fails, thereby limiting the spread of the fault and reducing the adverse effects caused by the fault.

Description

Power generation system

Technical Field

The application relates to the technical field of new energy, in particular to a power generation system.

Background

With the development of new energy power generation technology, the voltage of the direct current side of the power generation system is higher, so that the risk of the power generation system to fail is increased, and when the power generation system fails, for example, fires, the damage to the fire can be caused by the higher voltage of the direct current side of the power generation system. Therefore, when the power generation system fails, the dc side voltage of the power generation system needs to be quickly reduced to limit adverse effects caused by the failure.

Disclosure of utility model

In view of the above problems, the present application provides a power generation system that can quickly reduce the dc side voltage of the power generation system when the power generation system fails, thereby limiting the spread of the failure and reducing the adverse effects caused by the failure.

The application provides a power generation system, which comprises at least two power generation assemblies and at least two turnoff devices, wherein each turnoff device is electrically connected with the positive electrode end and the negative electrode end of the corresponding power generation assembly, each turnoff device is also directly or indirectly electrically connected to a direct current bus, so that the direct current bus is connected to the corresponding power generation assembly through the corresponding turnoff device, and each turnoff device is used for conducting or disconnecting the electrical connection between the corresponding power generation assembly and the direct current bus.

In one possible implementation, the shutoff device includes two input terminals for electrically connecting to the positive and negative terminals of the power generation assembly, respectively, and two output terminals for directly or indirectly electrically connecting to the positive and negative dc buses, respectively.

In one possible implementation, the shutoff device includes a power supply terminal for connecting to a power supply source for supplying power to the shutoff device.

In one possible implementation, the source of electrical power for the power supply includes at least one of electrical energy stored by a battery of the power supply. And the power generation assembly outputs electric energy. The external energy storage device provides power to the power supply.

In one possible implementation, the shutoff device includes an indicator light for indicating the on or off state of the shutoff device.

In one possible implementation, the shutdown device includes a key for controlling the shutdown device to turn on or off an electrical connection between the corresponding power generation assembly and the dc bus.

In one possible implementation, the shutdown device includes a communication module and a processor, the communication module is configured to receive a control instruction, and the processor is configured to control the shutdown device to turn on or off an electrical connection between a corresponding power generation component and the dc bus according to the control instruction.

In one possible implementation, at least two of the switches are connected in parallel or in series to the dc bus.

In one possible implementation, both outputs of the at least two switches are directly electrically connected to the positive and negative dc buses, such that the at least two switches are connected in parallel.

In one possible implementation, the two outputs of at least one of the at least two switches are indirectly connected to the positive and negative dc buses through the other switches, so that the at least two switches are connected in series.

In one possible implementation, the power generation assembly includes at least two power generation units connected in series, the power generation units including curved photovoltaic tiles, the surfaces of the curved photovoltaic tiles including one or more curved surfaces.

In one possible implementation, the cell in the curved photovoltaic tile comprises a full back electrode contact BC crystalline silicon photovoltaic cell.

In one possible implementation, the power generation system further includes a conversion circuit connected to the dc bus, the conversion circuit configured to voltage convert the dc bus voltage.

In one possible implementation, the power generation system further includes an energy storage device electrically connected to the conversion circuit for storing the electrical energy output by the conversion circuit.

Drawings

Fig. 1 is a schematic diagram of a power generation system provided by the present application.

Fig. 2 is a circuit diagram of a power generation system provided by the present application.

Fig. 3 is another circuit diagram of the power generation system provided by the present application.

Fig. 4 is a schematic structural diagram of the shutoff device provided by the application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application.

It is understood that the connection relationship described in the present application refers to direct or indirect connection. For example, the connection between a and B may be a direct connection between a and B or an indirect connection between a and B via one or more other electrical components. For example, a may be directly connected to C, and C may be directly connected to B, so that a connection between a and B is achieved through C. It is also understood that "a-connection B" as described herein may be a direct connection between a and B, or an indirect connection between a and B via one or more other electrical components.

In the description of the present application, "/" means "or" unless otherwise indicated, for example, A/B may mean A or B. The term "and/or" herein is merely an association relation describing the association object, and means that three kinds of relations may exist, for example, a and/or B may mean that a exists alone, a and B exist together, and B exists alone.

In the description of the present application, the words "first", "second", etc. are used only to distinguish different objects, and are not limited to numbers and execution orders, and the words "first", "second", etc. are not necessarily different. Furthermore, the terms "comprising," "including," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion.

The application provides a power generation system, which can quickly reduce the direct-current side voltage of the power generation system when the power generation system fails, thereby limiting the fault diffusion and reducing the adverse effect caused by the fault.

Specifically, referring to fig. 1, fig. 1 is a schematic diagram of a power generation system 10 according to the present application. The power generation system 10 includes a power generation source 11, a conversion circuit 12, and a switching circuit 13. The power generation source 11 is connected to the conversion circuit 12 via the switching circuit 13.

The power generation source 11 is configured to output a voltage, and the voltage is converted by the conversion circuit 12 and then output to an external device. The switching circuit 13 is used to turn on or off the electrical connection between the power generation source 11 and the conversion circuit 12.

The conversion circuit 12 may be a DC-DC conversion circuit, a DC-AC conversion circuit, or the like, and the DC-DC conversion circuit may convert a direct current voltage to boost or buck the direct current voltage output from the power generation source 11 and supply the direct current to an external device. Here, the external device may be a direct current load, an energy storage device, a battery, or the like, which receives direct current. Such as the energy storage device 10a. The DC-AC conversion circuit may perform inversion conversion to convert the direct current output from the power generation source 11 into alternating current and supply the alternating current to an external device. Here, the external device may be a device or structure that receives alternating current, such as an alternating current load, a power grid, or the like.

In some embodiments, the conversion circuit 102 includes both a DC-DC conversion circuit and a DC-AC conversion circuit.

Referring to fig. 2, fig. 2 is a circuit diagram of a power generation system 10 according to the present application. The power generation system 10 further includes a power supply source 101, the switching circuit 13 includes at least two shutoff devices 131, the power generation source 11 includes at least two power generation modules 111, and each power generation module 111 includes at least two power generation units 111a connected in series. In this way, each power generation assembly 111 may set the number of power generation units 111a according to the actual voltage requirement, so that the total output voltage after all the power generation units 111a are connected in series meets the actual voltage requirement, thereby improving the configuration flexibility of the power generation assembly 111.

The power supply 101 is connected to each of the shutters 131. The power supply 101 is used to supply power to each of the shutters 131. The power supply 101 may be an energy storage device, a battery, or other devices with an energy storage function.

In some embodiments, the power source 101 may be a small-sized energy storage device, and provides low-voltage dc power to each of the plurality of switches 131 through a parallel bus of one to N, where the low-voltage dc power ensures that each of the plurality of switches 131 operates normally. For example, the indicator light 131f (shown in fig. 4) of the shutoff 131 normally displays, the communication module normally receives and/or transmits a signal, and the like.

In some embodiments, the power source of the power supply 101 may be the electric energy in the storage battery of the power supply 101, the electric energy output by the power generation source 11, or the electric energy output by the external device such as the household energy storage device, so that the robustness of the power supply 101 is further ensured by multiple power sources, and even if multiple faults occur, the power supply 101 can supply power to each shutoff device 101, so that the safety and reliability of the power generation system 10 are further ensured.

The turnout 131 includes four connection terminals from a first connection end to a fourth connection end, wherein the first connection end and the second connection end are two output ends of the turnout 131, the third connection end and the fourth connection end are two input ends of the turnout 131, the first connection end and the second connection end of each turnout 131 are respectively connected with two poles of a direct current bus, for example, the first connection end of each turnout 131 is connected with a positive direct current bus, and the second connection end of each turnout 131 is connected with a negative direct current bus. In this way, both output terminals of each of the shutters 131 are directly electrically connected to the positive and negative dc buses, so that each of the shutters 131 constitutes a parallel connection.

The third connection terminal and the fourth connection terminal of each shutoff device 131 are respectively connected with two ends of the plurality of power generation units 111a after being connected in series. That is, each power generation assembly 111 is connected to the dc bus through one of the shutters 131, and at least two power generation assemblies 111 are connected to the dc bus in parallel. In this way, each of the shutters 131 constitutes a circuit of the positive dc bus-the first connection-the third connection-the positive pole of the power generation assembly 111-the negative pole of the power generation assembly 111-the fourth connection-the second connection-the negative dc bus.

In the application scenario where the shut down device 131 constitutes a parallel connection, i.e. in the application scenario shown in fig. 2, when the shut down device 131 is turned off, the shut down device 131 is configured such that the electrical connection between the first connection terminal and the third connection terminal and/or the electrical connection between the second connection terminal and the fourth connection terminal is disconnected, so that the corresponding power generation assembly 111 is disconnected from the dc bus.

In this way, when the shutoff device 131 is turned off, the voltage on the dc bus can be dropped rapidly, so as to enhance the safety performance of the power generation device 10, in addition, the shutoff device 131 can replace the shutoff function of the micro-inverter, and the cost is lower than that of the micro-inverter, and the operation difficulty and the installation configuration difficulty are also lower. Meanwhile, in the scenario that the output power of the power generation units 111a is low or the number of the power generation units 111a is large, the power generation assembly 111 formed by connecting the plurality of power generation units 111a in series is correspondingly provided with one shutoff device 131, so that the cost of respectively providing each power generation unit 111a with one micro inverter can be saved.

In addition, the on-off between each power generating component 111 and the dc bus can be controlled by the corresponding shutoff device 131, so that when one or more power generating components 111 fail, the one or more shutoff devices 131 corresponding to the failed power generating component 111 can shut off the electrical connection between the failed power generating component 111 and the dc bus, while other non-failed power generating components 111 maintain the electrical connection between the non-failed power generating component and the dc bus, which can limit the adverse effect of the failure and does not affect the continuous output voltage of other normal power generating components 111. In this way, the on-off between each power generation assembly 111 and the dc bus can be controlled independently, so that the maintenance of a single power generation assembly 111 is facilitated, and the maintenance difficulty of the power generation device 10 is reduced.

In some embodiments, the power generation unit 111a includes an electronic component that generates electrical energy through photovoltaic technology, such as a photovoltaic module, a curved photovoltaic tile, or the like. The shape of the curved photovoltaic tile can be set into a single wave crest arc curved surface or a plurality of wave crest arc curved surfaces. Thus, the shape of the curved photovoltaic tile is attached to the building shape, and the energy utilization rate of the light energy can be improved to a greater extent, and based on such a structure, the shutoff device 131 can be arranged at the concave position of a single peak arc-shaped curved surface or a plurality of peak arc-shaped curved surfaces, thereby saving the occupied area.

In some embodiments, the cell in the curved photovoltaic tile may be a full Back Contact (BC) crystalline silicon photovoltaic cell, so that the front surface of the cell in the curved photovoltaic tile has no grid line, which can improve the light energy absorption efficiency of the curved photovoltaic tile, shorten the current transmission path, and improve the performance of the curved photovoltaic tile.

Referring to fig. 3, fig. 3 is another circuit diagram of the power generation system 10 according to the present application. Fig. 3 differs from fig. 2 in that the two outputs of at least one of the at least two switches in fig. 3 are indirectly connected to the positive and negative dc buses via further switches, so that the at least two switches are connected in series.

Specifically, the number of the switches is 3, for example, the switches 1311, 1312, and 1313 are sequentially connected in series to the positive dc bus and the negative dc bus, specifically, the first output terminal of the switch 1311 is electrically connected to the positive dc bus, the second output terminal of the switch 1311 is electrically connected to the first output terminal of the switch 1312, the second output terminal of the switch 1312 is electrically connected to the first output terminal of the switch 1313, and the second output terminal of the switch 1313 is electrically connected to the negative dc bus. Both input terminals of the shutoff 1311, the shutoff 1312, the shutoff 1313 are electrically connected to the positive and negative electrodes of the corresponding power generation assembly 111.

In the application scenario where the shutdown devices 131 form a series connection, that is, in the application scenario shown in fig. 3, when the shutdown devices 131 are turned off, the shutdown devices 131 are configured to be directly turned on between two output terminals, so that the power generation component 111 corresponding to the shutdown devices 131 in the off state is bypassed, and thus the power generation component 111 segments corresponding to the shutdown devices 131 in the off state are disconnected from the electrical connection with the positive dc bus and the negative dc bus.

In this way, when one or more power generation assemblies 111 fail, the electrical connection between the failed power generation assembly 111 and the dc bus can be turned off by the one or more turn-off devices 131 corresponding to the failed power generation assembly 111, while other power generation assemblies 111 not failed remain in direct or indirect electrical connection with the dc bus, which can limit adverse effects of the failure and does not affect other normal power generation assemblies 111 to continue outputting voltage. In this way, the on-off between each power generation assembly 111 and the dc bus can be controlled independently, so that the maintenance of a single power generation assembly 111 is facilitated, and the maintenance difficulty of the power generation device 10 is reduced.

Referring to fig. 4, fig. 4 is a schematic structural diagram of the shutoff 131 according to the present application. The shutoff 131 includes a power supply pin 131a, a first input pin 131b, a second input pin 131c, a first output pin 131d, a second output pin 131e, an indicator light 131f, and a key 131g.

The power supply pin 131a is used for being connected with the power supply 101 to receive power supplied by the power supply 131 a.

The first output pin 131d and the second output pin 131e are two output ends, and correspond to the first connection end and the second connection end of the shutoff device 131 respectively, the first input pin 131b and the second input pin 131c are two input ends, and correspond to the third connection end and the fourth connection end respectively, that is, in the application scenario shown in fig. 2, the first output pin 131d and the second output pin 131e are connected with two poles of the dc bus respectively, that is, the positive dc bus and the negative dc bus. The first input pin 131b and the second input pin 131c are respectively connected to two ends of the power generation assembly 111. In the application scenario shown in fig. 3, the first output pin 131d of the shutoff 1311 is electrically connected to the positive dc bus, the second output pin 131e of the shutoff 1311 is electrically connected to the first output pin 131d of the shutoff 1312, the second output pin 131e of the shutoff 1312 is electrically connected to the first output pin 131d of the shutoff 1313, and the second output pin 131e of the shutoff 1313 is electrically connected to the negative dc bus. The first input pin 131b and the second input pin 131c of the shutoff 1311, the shutoff 1312, and the shutoff 1313 are electrically connected to the positive electrode and the negative electrode of the corresponding power generation component 111.

The indicator light 131f is used to indicate the operating state of the shutoff 131. Specifically, the indicator lamp 131f may display different operating states of the shutoff device 131 in different colors. For example, when the indicator light 131f displays red, it indicates that the shutoff device 131 is in the on state, that is, the corresponding electrical connection among the first input pin 131b, the second input pin 131c, the first output pin 131d, and the second output pin 131e is on. For another example, when the indicator light 131f displays green, it indicates that the shutoff device 131 is in the off state, that is, the corresponding electrical connection between the first input pin 131b, the second input pin 131c, the first output pin 131d, and the second output pin 131e is partially or completely disconnected.

The key 131g is used to switch the operating state of the shutoff 131. For example, when the key 131g is pressed, the operation state of the shutoff device 131 is switched from the on state to the off state, or from the off state to the on state.

In some embodiments, the shutoff 131 further includes a communication module and a processor, where the communication module is configured to communicate with other devices to receive a control instruction for controlling an operating state of the shutoff 131. The processor is used for switching the working state of the shutoff 131 according to the control instruction. The control command may be from a server, a fault detection unit, etc., and the communication mode between the communication module and other devices may be wireless communication or wired communication, for example, the server may send the control command to the communication module through wireless communication, for example, when the fault detection unit detects that the power generation system 10 fails and needs to reduce the voltage of the dc bus, the control command is sent to the communication module through electrical connection.

Therefore, the power generation system 10 provided by the application can quickly reduce the direct-current side voltage of the power generation system 10 when the power generation system 10 fails, thereby limiting the fault diffusion and reducing the adverse effect caused by the fault.

It will be appreciated by persons skilled in the art that the above embodiments have been provided for the purpose of illustrating the application and are not to be construed as limiting the application, and that suitable modifications and variations of the above embodiments are within the scope of the application as claimed.

Claims

1. A power generation system, characterized in that it comprises at least two power generation components and at least two circuit breakers, each of the circuit breakers being electrically connected to the positive terminal and the negative terminal of the corresponding power generation component, each of the circuit breakers being also directly or indirectly electrically connected to a DC bus, so that the DC bus is connected to the corresponding power generation component through the corresponding circuit breaker, and each of the circuit breakers is used to turn on or off the electrical connection between the corresponding power generation component and the DC bus.

2. The power generation system as described in claim 1 is characterized in that the circuit breaker includes two input terminals and two output terminals, the two input terminals are respectively used to electrically connect to the positive terminal and the negative terminal of the power generation component, and the two output terminals are respectively used to directly or indirectly electrically connect to the positive DC bus and the negative DC bus.

3. The power generation system according to claim 1, characterized in that the circuit breaker includes a power supply end, the power supply end is used to connect to a power supply, and the power supply is used to supply power to the circuit breaker.

4. The power generation system according to claim 3, wherein the power source of the power supply comprises at least one of the following:

The electric energy stored in the battery of the power supply;

The electric energy output by the power generation assembly;

The external energy storage device provides electrical energy to the power supply.

5. The power generation system according to claim 1, characterized in that the circuit breaker includes an indicator light, and the indicator light is used to indicate the on or off state of the circuit breaker.

6. The power generation system according to claim 1, characterized in that the switch comprises a button, and the button is used to control the switch to turn on or off the electrical connection between the corresponding power generation component and the DC bus.

7. The power generation system according to claim 1 is characterized in that the circuit breaker includes a communication module and a processor, the communication module is used to receive control instructions, and the processor is used to control the circuit breaker to turn on or off the electrical connection between the corresponding power generation component and the DC bus according to the control instructions.

8. The power generation system according to claim 2, characterized in that the at least two circuit breakers are connected to the DC bus in parallel or in series.

9. The power generation system according to claim 8, characterized in that the two output ends of the at least two circuit breakers are directly electrically connected to the positive DC bus and the negative DC bus, so that the at least two circuit breakers are connected in parallel.

10. The power generation system according to claim 8, characterized in that the two output ends of at least one of the at least two circuit breakers are indirectly connected to the positive DC bus and the negative DC bus through the other circuit breakers, so that the at least two circuit breakers are connected in series.

11. The power generation system according to claim 1, characterized in that the power generation component includes at least two power generation units connected in series, the power generation unit includes a curved photovoltaic tile, and the surface of the curved photovoltaic tile includes one or more arc-shaped surfaces.

12. The power generation system according to claim 11, characterized in that the cell sheets in the curved photovoltaic tiles include BC crystalline silicon photovoltaic cells with full back electrode contacts.

13. The power generation system according to claim 1, characterized in that the power generation system further comprises a conversion circuit, the conversion circuit is connected to the DC bus, and the conversion circuit is used to perform voltage conversion on the DC bus voltage.

14. The power generation system according to claim 13, characterized in that the power generation system further comprises an energy storage device, wherein the energy storage device is electrically connected to the conversion circuit and is used to store the electric energy output by the conversion circuit.