Power generation system

Abstract

The utility model provides a power generation system which comprises at least two power generation assemblies and at least two turn-off devices, each turn-off device is electrically connected with the positive electrode end and the negative electrode end of the corresponding power generation assembly, and each turn-off device is directly or indirectly electrically connected to a direct current bus so that the direct current bus can be connected to the corresponding power generation assembly through the corresponding turn-off device. And each turn-off device is used for connecting or disconnecting the electric connection between the corresponding power generation assembly and the direct current bus. Therefore, according to the power generation system provided by the invention, the direct current side voltage of the power generation system can be quickly reduced when the power generation system fails, so that fault diffusion is limited, and adverse effects caused by faults are reduced.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a power generation system. Background Art

[0002] With the development of new energy power generation technology, the DC side voltage of the power generation system is higher, which increases the risk of power generation system failure. When the power generation system fails, such as a fire, due to the high DC side voltage of the power generation system, hasty fire extinguishing may cause greater losses. Therefore, when the power generation system fails, it is necessary to quickly reduce the DC side voltage of the power generation system to limit the adverse effects of the failure. Utility Model Content

[0003] In view of the above problems, the present application provides a power generation system, which can quickly reduce the DC side voltage of the power generation system when a power generation system fault occurs, thereby limiting the spread of the fault and reducing the adverse effects caused by the fault.

[0004] The present application provides a power generation system, including at least two power generation components and at least two circuit breakers, each circuit breaker is electrically connected to the positive terminal and the negative terminal of the corresponding power generation component, and each circuit breaker 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 circuit breaker, and each circuit breaker is used to turn on or off the electrical connection between the corresponding power generation component and the DC bus.

[0005] In one possible implementation, 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.

[0006] In a possible implementation, the circuit breaker includes a power supply end, which is used to connect to a power supply, and the power supply is used to supply power to the circuit breaker.

[0007] In a possible implementation, the power source of the power supply includes at least one of the following: power stored in a battery of the power supply, power output by a power generation component, or power provided to the power supply by an external energy storage device.

[0008] In a possible implementation, the circuit breaker includes an indicator light, and the indicator light is used to indicate an on or off state of the circuit breaker.

[0009] In a possible implementation, the circuit breaker includes a button, and the button is used to control the circuit breaker to connect or disconnect the electrical connection between the corresponding power generation component and the DC bus.

[0010] In a possible implementation, the circuit breaker includes a communication module and a processor, the communication module is used to receive a control instruction, 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 instruction.

[0011] In a possible implementation, at least two circuit breakers are connected to the DC bus in parallel or in series.

[0012] In a possible implementation, both output ends of 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.

[0013] In a possible implementation, two output terminals 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 other circuit breakers, so that the at least two circuit breakers are connected in series.

[0014] In a possible implementation, the power generation assembly 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.

[0015] In a possible implementation, the cell sheet in the curved photovoltaic tile includes a BC crystalline silicon photovoltaic cell with full back electrode contact.

[0016] In a possible implementation, the power generation system further includes a conversion circuit, which is connected to the DC bus and is used to perform voltage conversion on the DC bus voltage.

[0017] In a possible implementation, the power generation system further includes an energy storage device, which is electrically connected to the conversion circuit and is used to store the electric energy output by the conversion circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the power generation system provided for this application.

[0019] Figure 2 A circuit diagram of a power generation system provided in this application.

[0020] Figure 3 Another circuit diagram of the power generation system provided for this application.

[0021] Figure 4 This is a schematic diagram of the structure of the circuit breaker provided in this application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application.

[0023] It is understandable that the connection relationship described in this application refers to direct or indirect connection. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. For example, A and C can be directly connected, and C and B can be directly connected, so that A and B are connected through C. It is also understandable that the "A connects B" described in this application can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0024] In the description of this application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0025] In the description of this application, words such as "first" and "second" are only used to distinguish different objects, and do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit differences. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0026] With the development of new energy power generation technology, the DC side voltage of the power generation system is higher, which increases the risk of power generation system failure. When the power generation system fails, such as a fire, due to the high DC side voltage of the power generation system, hasty fire extinguishing may cause greater losses. Therefore, when the power generation system fails, it is necessary to quickly reduce the DC side voltage of the power generation system to limit the adverse effects of the failure.

[0027] Therefore, the present application provides a power generation system that can quickly reduce the DC side voltage of the power generation system when a power generation system fault occurs, thereby limiting the spread of the fault and reducing the adverse effects caused by the fault.

[0028] Specifically, see Figure 1 , Figure 1 The schematic diagram of the power generation system 10 provided in the present application is as follows. The power generation system 10 includes a power generation source 11, a conversion circuit 12 and a switch circuit 13. The power generation source 11 is connected to the conversion circuit 12 via the switch circuit 13.

[0029] The power source 11 is used to output voltage, which is converted by the conversion circuit 12 and then output to an external device. The switch circuit 13 is used to connect or disconnect the electrical connection between the power source 11 and the conversion circuit 12.

[0030] Among them, the conversion circuit 12 can be a DC-DC conversion circuit, a DC-AC conversion circuit, etc., wherein the DC-DC conversion circuit can perform DC voltage conversion to boost or buck the DC voltage output by the power generation source 11 and then supply DC power to the external device. Here, the external device can be a device that receives DC power, such as a DC load, an energy storage device, a battery, etc. For example, the energy storage device 10a. The DC-AC conversion circuit can perform an inversion conversion to convert the DC power output by the power generation source 11 into AC power and then supply AC power to the external device. Here, the external device can be a device or structure that receives AC power, such as an AC load, a power grid, etc.

[0031] In some embodiments, the conversion circuit 102 includes both a DC-DC conversion circuit and a DC-AC conversion circuit.

[0032] See also Figure 2 , Figure 2 A circuit diagram of a power generation system 10 provided in the present application. The power generation system 10 also includes a power supply 101, a switch circuit 13 includes at least two switches 131, and a power generation source 11 includes at least two power generation components 111, each power generation component 111 includes at least two power generation units 111a connected in series. In this way, each power generation component 111 can 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 component 111.

[0033] The power supply 101 is connected to each switch 131. The power supply 101 is used to supply power to each switch 131. The power supply 101 may be a device with energy storage function such as an energy storage device or a battery.

[0034] In some embodiments, the power supply 101 may be a small energy storage device, and provides low-voltage direct current to each of the circuit breakers 131 through a one-to-N parallel bus, and the low-voltage direct current can ensure the normal operation of each of the circuit breakers 131. For example, the indicator light 131f ( Figure 4 ) is displayed normally, the communication module receives and / or sends signals normally, etc.

[0035] In some embodiments, the power source of the power supply 101 can be the power in its own battery, the power output by the power generation source 11, or the power output by external equipment such as a household energy storage device. In this way, multiple power sources further ensure the robustness of the power supply 101. Even in the event of multiple faults, the power supply 101 can supply power to each circuit breaker 101, thereby ensuring the safety and reliability of the power generation system 10.

[0036] The switch 131 includes four connection terminals, from the first connection terminal to the fourth connection terminal, wherein the first connection terminal and the second connection terminal are two output terminals of the switch 131, the third connection terminal and the fourth connection terminal are two input terminals of the switch 131, and the first connection terminal and the second connection terminal of each switch 131 are respectively connected to the two poles of the DC bus, for example, the first connection terminal of each switch 131 is connected to the positive DC bus, and the second connection terminal of each switch 131 is connected to the negative DC bus. In this way, the two output terminals of each switch 131 are directly electrically connected to the positive DC bus and the negative DC bus, so that each switch 131 is connected in parallel.

[0037] The third connection end and the fourth connection end of each disconnector 131 are respectively connected to the two ends of the plurality of power generation units 111a connected in series. That is, each power generation component 111 is connected to the DC bus through a disconnector 131, and at least two power generation components 111 are connected to the DC bus in parallel. In this way, each disconnector 131 forms a loop of positive DC bus-first connection end-third connection end-positive electrode of power generation component 111-negative electrode of power generation component 111-fourth connection end-second connection end-negative DC bus.

[0038] In the application scenario where the circuit breakers 131 are connected in parallel, that is, Figure 2 In the application scenario shown, when the circuit breaker 131 is turned off, the circuit breaker 131 is configured to disconnect 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, so that the corresponding power generation component 111 is disconnected from the electrical connection with the DC bus.

[0039] In this way, when the switch 131 is turned off, the voltage on the DC bus can drop quickly, thereby enhancing the safety performance of the power generation equipment 10. In addition, the switch 131 can replace the shutdown function of the micro-inverter, and the cost is lower than that of setting up a micro-inverter, and the difficulty of operation and installation configuration is also lower. At the same time, in the scenario where the output power of the power generation unit 111a is low or the number is large, a switch 131 is set corresponding to the power generation assembly 111 formed by connecting multiple power generation units 111a in series, which can also save the cost of setting up a micro-inverter for each power generation unit 111a.

[0040] In addition, the on-off between each power generation component 111 and the DC bus can be controlled by the corresponding switch 131, so that when one or more power generation components 111 fail, the electrical connection between the failed power generation component 111 and the DC bus can be shut off by one or more switches 131 corresponding to the failed power generation component 111, while other power generation components 111 that are not failed maintain electrical connection with the DC bus, which can limit the adverse effects of the failure and does not affect other normal power generation components 111 to continue to output voltage. In this way, the on-off between each power generation component 111 and the DC bus can be controlled separately, which is convenient for the maintenance of a single power generation component 111, and reduces the difficulty of maintenance of the power generation equipment 10.

[0041] In some embodiments, the power generation unit 111a includes electronic components such as photovoltaic modules and curved photovoltaic tiles that generate electricity through photovoltaic technology. Among them, the shape of the curved photovoltaic tile can be set to a single crest arc surface or multiple crest arc surfaces. In this way, the shape of the curved photovoltaic tile fits the shape of the building and can maximize the energy utilization rate of light energy. Based on such a structure, the switch 131 can be set in a depression of a single crest arc surface or multiple crest arc surfaces, thereby saving occupied area.

[0042] In some embodiments, the cells in the curved photovoltaic tiles can use full back electrode contact (BC) crystalline silicon photovoltaic cells. In this way, there are no grid lines on the front of the cells in the curved photovoltaic tiles, which can improve the light energy absorption efficiency of the curved photovoltaic tiles, shorten the current transmission path, and improve the performance of the curved photovoltaic tiles.

[0043] See also Figure 3 , Figure 3 Another circuit diagram of the power generation system 10 provided in the present application. Figure 3 and Figure 2 The difference is that Figure 3 Two output ends of at least one of the at least two breakers are indirectly connected to the positive DC bus and the negative DC bus through other breakers, so that the at least two breakers are connected in series.

[0044] Specifically, taking the number of the circuit breakers as 3 as an example, the circuit breakers 1311, 1312, and 1313 are connected in series to the positive DC bus and the negative DC bus in sequence. Specifically, the first output end of the circuit breaker 1311 is electrically connected to the positive DC bus, the second output end of the circuit breaker 1311 is electrically connected to the first output end of the circuit breaker 1312, the second output end of the circuit breaker 1312 is electrically connected to the first output end of the circuit breaker 1313, and the second output end of the circuit breaker 1313 is electrically connected to the negative DC bus. The two input ends of the circuit breakers 1311, 1312, and 1313 are all electrically connected to the positive and negative electrodes of the corresponding power generation components 111.

[0045] In the application scenario where the disconnectors 131 are connected in series, that is, Figure 3 In the application scenario shown, when the switch 131 is turned off, the switch 131 is configured to directly conduct between the two output terminals, so that the power generation component 111 corresponding to the switch 131 in the turned-off state is bypassed, and the power generation component 111 corresponding to the switch 131 in the turned-off state is disconnected from the positive DC bus and the negative DC bus.

[0046] In this way, when one or more power generation components 111 fail, the electrical connection between the failed power generation component 111 and the DC bus can be cut off by one or more disconnectors 131 corresponding to the failed power generation component 111, while other power generation components 111 that are not failed maintain direct or indirect electrical connection with the DC bus, which can limit the adverse effects of the failure and does not affect other normal power generation components 111 to continue to output voltage. In this way, the connection and disconnection between each power generation component 111 and the DC bus can be controlled separately, which is convenient for the maintenance of a single power generation component 111 and reduces the difficulty of maintenance of the power generation equipment 10.

[0047] See also Figure 4 , Figure 4 The schematic diagram of the structure of the switch 131 provided in the present application is as follows. The switch 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 button 131g.

[0048] The power supply pin 131 a is used to connect to the power supply source 101 to receive power provided by the power supply source 131 a .

[0049] The first output pin 131d and the second output pin 131e are two output terminals, corresponding to the first connection terminal and the second connection terminal of the circuit breaker 131, respectively. The first input pin 131b and the second input pin 131c are two input terminals, corresponding to the third connection terminal and the fourth connection terminal, respectively. Figure 2 In the application scenario shown, the first output pin 131d and the second output pin 131e are respectively connected to the two poles of the DC bus, 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 the two ends of the power generation component 111. Figure 3In the application scenario shown, the first output pin 131d of the circuit breaker 1311 is electrically connected to the positive DC bus, the second output pin 131e of the circuit breaker 1311 is electrically connected to the first output pin 131d of the circuit breaker 1312, the second output pin 131e of the circuit breaker 1312 is electrically connected to the first output pin 131d of the circuit breaker 1313, and the second output pin 131e of the circuit breaker 1313 is electrically connected to the negative DC bus. The first input pin 131b and the second input pin 131c of the circuit breaker 1311, the circuit breaker 1312, and the circuit breaker 1313 are all electrically connected to the positive and negative electrodes of the corresponding power generation component 111.

[0050] The indicator light 131f is used to indicate the working state of the circuit breaker 131. Specifically, the indicator light 131f can display different working states of the circuit breaker 131 in different colors. For example, when the indicator light 131f displays red, it indicates that the circuit breaker 131 is in the on state, that is, the corresponding electrical connections between the first input pin 131b, the second input pin 131c, the first output pin 131d, and the second output pin 131e are connected. For another example, when the indicator light 131f displays green, it indicates that the circuit breaker 131 is in the off state, that is, the corresponding electrical connections between the first input pin 131b, the second input pin 131c, the first output pin 131d, and the second output pin 131e are partially or completely disconnected.

[0051] The button 131g is used to switch the working state of the circuit breaker 131. For example, after pressing the button 131g, the working state of the circuit breaker 131 is switched from the on state to the off state, or from the off state to the on state.

[0052] In some embodiments, the switch 131 further includes a communication module and a processor, wherein the communication module is used to communicate with other devices to receive control instructions for controlling the working state of the switch 131. The processor is used to switch the working state of the switch 131 according to the control instructions. The control instructions may come from a server, a fault detection unit, etc., and the communication module and other devices may communicate by wireless communication or by wired communication. For example, the server may send control instructions to the communication module via wireless communication. For another example, when the fault detection unit detects that a fault occurs in the power generation system 10 and the voltage of the DC bus needs to be reduced, the control instructions are sent to the communication module via an electrical connection.

[0053] Therefore, the power generation system 10 provided in the present application can quickly reduce the DC side voltage of the power generation system 10 when a fault occurs in the power generation system 10, thereby limiting the spread of the fault and reducing the adverse effects caused by the fault.

[0054] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. A power generation system, characterized in that: It includes at least two power generation components and at least two circuit breakers, each of which is electrically connected to the positive terminal and the negative terminal of the corresponding power generation component, and each of which 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 circuit breaker, and each of which 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 according to claim 1, characterized in that: The circuit breaker includes two input terminals and two output terminals, wherein the two input terminals are respectively used to be electrically connected to the positive terminal and the negative terminal of the power generation component, and the two output terminals are respectively used to be directly or indirectly electrically connected 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, and the power supply end is used to connect to a power supply source, and the power supply source is used to supply power to the circuit breaker.

4. The power generation system according to claim 3, characterized in that: The power source of the power supply includes 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 switch includes an indicator light, and the indicator light is used to indicate an on or off state of the switch.

6. The power generation system according to claim 1, characterized in that: The switch includes 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, characterized in that: The switch includes a communication module and a processor, wherein the communication module is used to receive a control instruction, and the processor is used to control the switch to turn on or off the electrical connection between the corresponding power generation component and the DC bus according to the control instruction.

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 breakers are indirectly connected to the positive DC bus and the negative DC bus through the other breakers, so that the at least two breakers are connected in series.

11. The power generation system according to claim 1, characterized in that: The power generation assembly includes at least two power generation units connected in series, and 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 sheet in the curved photovoltaic tile includes a BC crystalline silicon photovoltaic cell with full back electrode contact.

13. The power generation system according to claim 1, characterized in that: The power generation system further includes a conversion circuit, which is connected to the DC bus and 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 also includes an energy storage device, which is electrically connected to the conversion circuit and is used to store the electric energy output by the conversion circuit.

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