Protection apparatus and protection method for new energy system, and related apparatus

Abstract

The present application relates to the technical field of power electronics, and discloses a protection apparatus and protection method for a new energy system, and a related apparatus. In the protection apparatus, an operating mechanism is used for receiving an operation of changing the open / closed state of a switch; a first trip unit and a second trip unit can respectively receive external control signals by means of corresponding switch interface units; upon receiving a first control signal, the first trip unit performs a tripping action, thereby controlling the switch to open; and upon receiving a second control signal, the second trip unit performs the tripping action, thereby not only controlling the switch to open, but also controlling the switch to be maintained in the open state, so that on-site personnel are no longer able to use the operating mechanism to perform a manual operation of closing the switch, thereby reducing the risk of secondary damage to a device and fire hazards. Moreover, by means of dual control signals and dual trip units, the new energy system can achieve two different protection functions respectively in two fault categories.

Description

Protection devices and methods for new energy systems and related devices

[0001] This application claims priority to Chinese Patent Application No. 202411712035.8, filed on November 26, 2024, entitled “Protection Device and Protection Method for New Energy Systems and Related Devices”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of power electronics technology, and in particular to a protection device and protection method for a new energy system, as well as related devices. Background Technology

[0003] In new energy systems, DC power is typically connected to the subsequent conversion circuit via a corresponding switch. When a fault occurs in the DC power supply or conversion circuit, the controller can trip the switch to protect the new energy system. However, field staff have found that after the switch trips, they often manually re-close it, which may cause secondary damage to the equipment and even pose a fire risk, endangering property and personal safety. Summary of the Invention

[0004] In view of the above problems, this application provides a protection device and method for a new energy system, as well as related devices, to reduce the risk of secondary damage to equipment and fire. The specific solution is as follows:

[0005] The first aspect of this application provides a protection device for a new energy system, comprising: a first trip unit, a second trip unit, an operating mechanism, at least one switch, and at least one switch interface unit; wherein...

[0006] The operating mechanism is used to accept operations that change the on / off state of the switch;

[0007] The input terminal of the first trip unit receives a first control signal through the corresponding switch interface unit; the first control signal is sent by the controller of the protection device in the equipment belonging to the new energy system.

[0008] The input terminal of the second trip unit receives a second control signal through the corresponding switch interface unit; the second control signal is sent by the controller.

[0009] Upon receiving the first control signal, the first trip unit performs a tripping action, controlling the switch to disconnect;

[0010] Upon receiving the second control signal, the second trip unit performs a tripping action, controlling the switch to disconnect and maintaining the switch in the open state.

[0011] In one possible implementation, a reset switch is provided on the second trip unit;

[0012] When the second trip unit performs the tripping action, it controls the reset switch to maintain the switch in the open state.

[0013] In one possible implementation, the manual operation terminal of the reset switch is located inside or outside the housing of the protective device belonging to the new energy system.

[0014] In one possible implementation, the first trip unit and the second trip unit are respectively connected to different switch interface units; or...

[0015] The first trip unit and the second trip unit are connected to the same switch interface unit; and the input terminal of the first trip unit is connected to the first interface in the switch interface unit; the input terminal of the second trip unit is connected to the second interface in the switch interface unit.

[0016] In one possible implementation, the first interface and the second interface are independent of each other, or the first interface and the second interface share a positive or negative interface.

[0017] In one possible implementation, the number of switches is greater than 1, and all the switches are linked together.

[0018] In one possible implementation, the operating mechanism includes: a knob and a connecting rod;

[0019] The knob is for manual operation;

[0020] The connecting rod enables a mechanical connection between the knob and the switch.

[0021] The second aspect of this application provides a combiner box, including: a busbar, a control unit, and at least one protection device for a new energy system as described in the first aspect or any implementation thereof;

[0022] The busbar is connected to the input terminal of the combiner box via the corresponding protection device to access at least one DC power source;

[0023] The busbar is connected to the output end of the junction box;

[0024] The protection device is controlled by the control unit.

[0025] In one possible implementation, the combiner box further includes: at least one DC / DC converter circuit;

[0026] The DC / DC converter circuit is connected between the corresponding protection device and the busbar;

[0027] The DC / DC conversion circuit is controlled by the control unit.

[0028] In one possible implementation, the control unit includes: a controller, a data acquisition module, and a drive circuit;

[0029] The controller acquires voltage and / or current information at at least one location in the combiner box through the acquisition module;

[0030] The controller outputs control signals through the drive circuit.

[0031] In one possible implementation, when the controller outputs a first control signal for the protection device through the drive circuit, the function of outputting a second control signal for the protection device is restricted.

[0032] In one possible implementation, the control unit further includes: a switching power supply; the output terminal of the switching power supply is connected to the power supply terminal of the drive circuit.

[0033] In one possible implementation, the junction box further includes: a housing;

[0034] The knob of the operating mechanism in the protective device is located outside the housing.

[0035] A third aspect of this application provides a power converter, comprising: a control unit, a DC / AC conversion circuit, and at least one protection device for a new energy system as described in the first aspect or any implementation thereof.

[0036] The DC side of the DC / AC conversion circuit is connected to the input terminal of the power converter through the corresponding protection device to access at least one DC power supply.

[0037] The AC side of the DC / AC conversion circuit serves as the output terminal of the power converter.

[0038] The DC / AC conversion circuit and the protection device are respectively controlled by the control unit.

[0039] In one possible implementation, the power converter further includes at least one DC / DC conversion circuit;

[0040] The DC / DC converter circuit is connected between the corresponding protection device and the DC / AC converter circuit on the DC side.

[0041] The DC / DC conversion circuit is controlled by the control unit.

[0042] In one possible implementation, the control unit includes: a controller, a data acquisition module, and a drive circuit;

[0043] The controller acquires voltage and / or current acquisition information at at least one location in the power converter through the acquisition module;

[0044] The controller outputs control signals through the drive circuit.

[0045] In one possible implementation, when the controller outputs a first control signal for the protection device through the drive circuit, the function of outputting a second control signal for the protection device is restricted.

[0046] In one possible implementation, the control unit further includes: a switching power supply; the output terminal of the switching power supply is connected to the power supply terminal of the drive circuit.

[0047] In one possible implementation, the power converter further includes: a housing;

[0048] The knob of the operating mechanism in the protective device is located outside the housing.

[0049] A fourth aspect of this application provides a protection method for a new energy system, applied to a combiner box as described in the second aspect or any implementation thereof, or a power converter as described in the third aspect or any implementation thereof; the protection method includes:

[0050] Acquire the collected information from the combiner box or the power converter;

[0051] Based on the collected information, it is determined whether the new energy system has experienced a first-type fault or a second-type fault;

[0052] If the new energy system experiences the first type of fault, a first control signal is output for the protection device in the combiner box or the power converter.

[0053] If the new energy system experiences the second type of fault, a second control signal is output to the protection device.

[0054] In one possible implementation, the second type of fault includes at least one of the following:

[0055] The converter box or the power converter is faulty;

[0056] The power converter has a bus capacitor fault.

[0057] In one possible implementation, the first type of fault includes at least one of the following:

[0058] A grounding fault occurred in the DC power supply connected to the combiner box or the power converter.

[0059] The DC power supply experienced a short circuit fault.

[0060] The DC power supply experienced a reverse connection fault.

[0061] In one possible implementation, after determining that the new energy system has experienced a Type I fault, the method further includes:

[0062] The output function of the second control signal is placed in a restricted state.

[0063] In one possible implementation, after determining that the new energy system has malfunctioned, the method further includes:

[0064] Control the junction box or the power converter to shut down, and / or report fault information.

[0065] The fifth aspect of this application provides a control device, characterized in that it includes a processor and a memory, the memory being used to store programs, instructions or code, and the processor being used to execute the programs, instructions or code in the memory to perform the protection method for a new energy system as described in the fourth aspect or any implementation thereof.

[0066] The sixth aspect of this application provides a computer-readable storage medium, characterized in that it stores a computer program, which is loaded by a processor to execute the protection method for a new energy system as described in the fourth aspect or any implementation thereof.

[0067] The protection device for a new energy system provided by this application, based on the above technical solution, includes: an operating mechanism, two trip units, at least one switch, and at least one switch interface unit. The operating mechanism is used to receive operations that change the on / off state of the switch. The first and second trip units can receive external control signals through their respective switch interface units. When the first trip unit receives a first control signal, it performs a tripping action, controlling the switch to open. When the second trip unit receives a second control signal, it performs a tripping action, not only controlling the switch to open but also maintaining it in the open state. This prevents on-site personnel from manually closing the switch via the operating mechanism, thereby reducing the risk of secondary damage to the equipment and fire. Furthermore, through dual control signals and dual trip units, the new energy system can achieve two different protection functions under two different fault categories. Attached Figure Description

[0068] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0069] Figure 1 is a schematic diagram of a protective device provided in an embodiment of this application;

[0070] Figure 2 is a schematic diagram of another structure of the protection device provided in an embodiment of this application;

[0071] Figure 3 is a schematic diagram of the structure of the housing of the device to which the protective device provided in the embodiment of this application belongs;

[0072] Figure 4 is a schematic diagram of another structure of the protection device provided in the embodiment of this application;

[0073] Figure 5 is a schematic diagram of another structure of the protection device provided in the embodiment of this application;

[0074] Figure 6 is a structural diagram of a protection device provided in an embodiment of this application;

[0075] Figure 7 is a schematic diagram of a junction box provided in an embodiment of this application;

[0076] Figure 8 is a schematic diagram of another structure of the combiner box provided in the embodiment of this application;

[0077] Figure 9 is a schematic diagram of a control unit in the protection device and its associated equipment provided in the embodiments of this application;

[0078] Figure 10 is a schematic diagram of a power converter provided in an embodiment of this application;

[0079] Figure 11 is a flowchart of a protection method for a new energy system provided in an embodiment of this application;

[0080] Figure 12 is a schematic diagram of the structure of a control device provided in an embodiment of this application. Detailed Implementation

[0081] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.

[0082] The embodiments of this application are described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Those skilled in the art will understand that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0083] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0084] This application provides a protection device for a new energy system to reduce the risk of secondary damage to the equipment and fire. The specific solution is as follows:

[0085] As shown in Figure 1, the protection device of this new energy system includes: at least one (one is shown as an example in the figure) switch 101, a first trip unit 102, a second trip unit 103, an operating mechanism 104, and at least one (one is shown as an example in the figure) switch interface unit 105; wherein:

[0086] The operating mechanism 104 is used to receive operations that can be used to change the on / off state of the switch 101. In practical applications, this operation can refer to manual operation or automatic control, and is not limited here. That is, under normal circumstances, the on / off state of the switch 101 can be changed by manually operating the operating mechanism 104.

[0087] The input terminals of the first trip unit 102 and the second trip unit 103 respectively receive external control signals through corresponding switch interface units, such as switch interface unit 105 in Figure 1. These control signals can originate from the controller of the equipment to which the protection device 10 belongs in the new energy system. The equipment to which the protection device 10 belongs in the new energy system can be a power converter or a combiner box; this is not limited here.

[0088] In practical applications, the first trip unit 102 and the second trip unit 103 can each receive different control signals. For example, the first trip unit 102 can receive a first control signal, and the second trip unit 103 can receive a second control signal. These control signals can be power signals, specifically voltage signals or current signals, which are not limited here.

[0089] Upon receiving a first control signal, the first trip unit 102 performs a tripping action, causing the switch 101 to disconnect. In practical applications, the first control signal can be a power signal that controls the first trip unit 102 to perform the tripping action; upon receiving the first control signal, the first trip unit 102 performs the tripping action, which causes the switch 101 to disconnect. When the number of switches 101 is greater than one, each switch 101 will be affected by the same tripping action of the first trip unit 102.

[0090] Upon receiving the second control signal, the second trip unit 103 performs a tripping action, thereby controlling the switch 101 to open and maintaining the switch 101 in the open state. When the number of switches 101 is greater than one, each switch 101 will be affected by the tripping action of the second trip unit 103 in the same way. In practical applications, the second control signal can be a power signal that controls the second trip unit 103 to perform the tripping action; upon receiving the second control signal, the second trip unit 103 performs the tripping action; moreover, in this embodiment, the second trip unit 103 is configured to perform the tripping action, causing the switch 101 to open while simultaneously maintaining the switch 101 in the open state, thereby avoiding the need for on-site personnel to manually close the switch 101 through the operating mechanism 104.

[0091] The specific working principle is as follows:

[0092] In practical applications, the protection device 10 can be applied to the DC side of a new energy system, connecting the DC power supply and the subsequent conversion circuit. The DC power supply can refer to a photovoltaic unit, such as a photovoltaic module or photovoltaic string; it can also refer to an energy storage unit, such as a battery pack or battery cluster. There is no specific limitation; it depends on the specific application environment. The subsequent conversion circuit can be a DC / AC conversion circuit or a DC / DC conversion circuit. When a fault occurs inside the DC power supply or the subsequent conversion circuit, such as a reverse connection or short circuit in the DC power supply, or a short circuit in the subsequent conversion circuit, the controller can send a corresponding control signal to activate the first trip unit 102 or the second trip unit 103, causing the switch 101 to disconnect, thus achieving the protection function for the new energy system.

[0093] Suppose that a minor fault occurs in the current new energy system, such as a fault in the DC power supply or the downstream conversion circuit. In this case, the controller can send a first control signal and transmit it to the first trip unit 102 through the switch interface unit 105, causing the first trip unit 102 to activate and thus disconnect the switch 101. In this case, the switch 101 can also be closed by the operating mechanism 104.

[0094] Suppose a serious fault occurs in the current new energy system, such as a short circuit in the downstream converter or a bus capacitor fault between the positive and negative terminals of the DC bus connected to the DC / AC converter circuit. On-site personnel cannot directly eliminate the fault and require professional technicians to replace or repair equipment related to the downstream converter circuit, such as combiner boxes or power converters. If on-site personnel discover that switch 101 has tripped but cannot determine the specific fault, and attempt to manually reclose switch 101 by operating mechanism 104, the reclosing of switch 101 could cause secondary damage to the equipment or even start a fire, endangering property and personal safety. Therefore, in this embodiment, the controller can send a second control signal at this time and transmit it to the second trip unit 103 through the switch interface unit 105, causing the second trip unit 103 to operate. Moreover, the tripping action of the second trip unit 103 will not only disconnect the switch 101, but also keep the switch 101 in the open state. That is, after the second trip unit 103 performs the tripping action, it can no longer close the moving contact and stationary contact inside the switch 101 through the operating mechanism 104. As a result, the closing operation of the on-site personnel cannot be successful in this situation, and the DC power supply and the subsequent conversion circuit cannot be connected, thus avoiding secondary damage or even fire to the corresponding equipment.

[0095] In practical applications, faults can be classified according to their impact. For example, various faults can be divided into Class I faults and Class II faults. In Class I faults, the impact is relatively small. If the on-site personnel close the protection device 10 again after it trips, there will be no serious secondary damage or fire. In practical applications, this Class I fault can be a DC power supply grounding or short circuit fault. In this case, the first trip unit 102 is activated by the first control signal, causing the switch 101 to disconnect. After the on-site personnel eliminate the grounding and short circuit faults, they can close the protection device 10 again through the operating mechanism 104, causing the moving and stationary contacts inside the switch 101 to close, realizing the connection between the DC power supply and the subsequent conversion circuit, and the new energy system can resume normal operation. In the second type of fault, the impact is more significant. If the on-site personnel close the protection device 10 again after it has tripped, serious secondary damage or fire may occur. This second type of fault may be a fault in the downstream conversion circuit, such as a DC / DC conversion circuit or a DC / AC conversion circuit, or a bus capacitor fault. The on-site personnel cannot directly eliminate the fault and professional technicians are required to replace or repair the equipment. Therefore, the second control signal controls the second trip unit 103 to operate. After the second trip unit 103 operates, the moving and stationary contacts inside the switch 101 cannot be closed by the operating mechanism 104, and the connection between the DC power supply and the downstream conversion circuit cannot be achieved.

[0096] The protection device 10 for the new energy system provided in this embodiment, based on the above principle, prevents on-site personnel from manually closing the switch 101 via the operating mechanism 104 after the second trip unit 103 performs its tripping action. This reduces the risk of secondary damage to the equipment and fire. Furthermore, through dual control signals and dual trip units, the new energy system can achieve two different protection functions under two different fault categories.

[0097] Based on the previous embodiment, this embodiment provides another protection device 10 for a new energy system, as shown in FIG2. A reset switch 106 is provided on the second trip unit 103. When the second trip unit 103 performs a tripping action, it controls the reset switch 106 to keep the switch 101 in the open state.

[0098] In practical applications, the state of the reset switch 106 can include: a first position and a second position. When the reset switch 106 is in the first position, the protection device 10 can be closed by the operating mechanism 104. When the reset switch 106 is in the second position, the protection device 10 cannot be closed by the operating mechanism 104. When the second trip unit 103 performs a tripping action, it causes the reset switch 106 to be placed in the second position; specifically, when the reset switch 106 is placed in the second position, it can limit the linkage of the switch 101, preventing the linkage from closing the moving and stationary contacts inside the switch 101, thereby preventing the protection device 10 from being manually closed.

[0099] The specific implementation of the reset switch 106 is not limited, as long as it can achieve the above-mentioned limiting function for the linkage; in practical applications, it can also be linked with the tripping action of the second trip unit 103 through other devices, as long as it can keep the switch 101 in the open state, all of which are within the protection scope of this application.

[0100] In one example, the manual operation terminal of the reset switch 106 is located inside the housing of the device to which the protection device 10 belongs within the new energy system.

[0101] In practical applications, the protective device 10, when used in equipment within a new energy system, can be housed in a corresponding enclosure that can be opened by skilled technicians for maintenance. In one example, as shown in Figure 3, the enclosure may include a shell structure 21 and a cover plate 22. The shell structure 21 has an opening on one side, and the cover plate 22 is detachably mounted on this opening. By placing the reset switch 106 inside the enclosure, after eliminating the aforementioned serious fault, skilled technicians can, with the cover plate 22 open, place the reset switch 106 in the first position to remove its limiting function on the connecting rod before installing the cover plate 22. At this point, the operating mechanism 104 can be used to close the switch 101, restoring the equipment to normal operation.

[0102] In this embodiment, the manual operation terminal of the reset switch 106 is located inside the housing of the corresponding device. This can prevent the on-site personnel from directly moving the reset switch 106 from the second position to the first position after the second tripping device 103 trips, which would cause the protection device 10 to close and result in secondary damage or fire.

[0103] In another example, the manual operation end of the reset switch 106 can also be located outside the housing of the corresponding device. Furthermore, to prevent on-site personnel from operating the reset switch 106, a cover can be provided on the outside of the housing for the reset switch 106. For example, the cover can be located outside the outer shell structure 21 shown in Figure 3, but is not limited to this. After a professional technician eliminates the aforementioned serious fault, the cover can be opened, and the reset switch 106 can be placed in the first position, eliminating the limiting function of the reset switch 106 on the linkage, allowing the operating mechanism 104 to resume its closing operation function for the switch 101.

[0104] That is, when the manual operation terminal of the reset switch 106 is located outside the housing of the corresponding device, an additional cover can be added to prevent on-site personnel from operating the reset switch 106 before the fault is cleared. Of course, for cost and safety considerations, the manual operation terminal of the reset switch 106 can be directly located inside the housing of the corresponding device. This embodiment does not limit the location of the reset switch 106; it can be determined according to the actual application environment requirements, all of which are within the protection scope of this application.

[0105] In practical applications, the number of switch interface units 105 can be one or more. Figures 1 and 2 show the case when only one switch interface unit 105 is set, and Figure 4 shows the case when two switch interface units 105 are set.

[0106] As shown in Figure 4, the first trip unit 102 and the second trip unit 103 can be connected to different switch interface units 105. When a minor first-type fault occurs in the new energy system, the controller can send a first control signal, which is transmitted to the first trip unit 102 through the switch interface unit 105 (including positive interface 1+ and negative interface 1-) shown in the upper left corner of Figure 4, causing the first trip unit 102 to activate. When a more serious second-type fault occurs in the new energy system, the controller 201 sends a second control signal, which is transmitted to the second trip unit 103 through the switch interface unit 105 (including positive interface 2+ and negative interface 2-) shown in the lower left corner of Figure 4, causing the second trip unit 103 to activate.

[0107] As shown in Figure 1 or Figure 2, when there is only one switch interface unit 105, this switch interface unit 105 can receive two types of control signals through corresponding interfaces to control the operation of the two trip units inside the switch 101 respectively. When the switch interface unit 105 receives the second control signal, the second trip unit 103 operates; when the switch interface unit 105 receives the first control signal, the first trip unit 102 operates. In this case, the input terminal of the first trip unit 102 can be connected to the first interface (positive terminal is shown as 1+ in the figure, negative terminal is shown as -1 in the figure) in the switch interface unit 105, while the input terminal of the second trip unit 103 can be connected to the second interface (positive terminal is shown as 2+ in the figure, negative terminal is shown as 2- in the figure) in the switch interface unit 105.

[0108] In one example, the first interface and the second interface of the switch interface unit 105 can be independent or share a positive or negative interface; it depends on the specific application environment, and all are within the protection scope of this application.

[0109] In one possible implementation, the two interfaces of the switch interface unit 105 are independent. As shown in Figure 1 or Figure 2, the switch interface unit 105 consists of a four-wire interface for transmitting a first control signal and a second control signal. The four-wire interface includes: a first control signal positive interface 1+, a first control signal negative interface 1-, a second control signal positive interface 2+, and a second control signal negative interface 2-. Specifically, the first control signal positive interface 1+ is used to connect to the positive terminal of the first control signal transmission cable, and the first control signal negative interface 1- is used to connect to the negative terminal of the first control signal transmission cable; the second control signal positive interface 2+ is used to connect to the positive terminal of the second control signal transmission cable, and the second control signal negative interface 2- is used to connect to the negative terminal of the second control signal transmission cable.

[0110] As another possible implementation, the two interfaces of the switch interface unit 105 can also share a positive interface or a negative interface; as shown in Figure 5, the two interfaces share a negative interface 1 / 2-. In this case, the transmission cables of the first control signal and the second control signal are connected to the same negative terminal, that is, the transmission of the first control signal and the second control signal is realized through a three-wire interface, which can achieve the purpose of reducing the number of interfaces; the two interfaces sharing a positive interface is another implementation of the three-wire interface, which will not be shown in the figure.

[0111] The specific implementation of the switch interface unit 105 may vary depending on its specific application environment, and is not limited here, but is within the protection scope of this application.

[0112] Based on the above embodiments, this embodiment provides another protection device 10 for a new energy system, wherein the number of switches 101 is greater than 1, and each switch 101 is linked. Figure 6 shows an optional structure of the protection device 10. Assuming that the number of switches 101 is P, where P is an integer greater than 1, these P switches 101 can constitute a P-level linkage switch 100. The P-level linkage switch 100 can be interrupted by the tripping action of the first trip unit 102, or by the tripping action of the second trip unit 103 (not shown in the figure), and can also be controlled by the operating mechanism 104.

[0113] In one example, as shown in FIG6, the operating mechanism 104 includes a knob 141 and a connecting rod 142; the knob 141 is used to accept the above-mentioned manual operation; the connecting rod 142 is used to realize the mechanical connection between the knob 141 and the switch 101.

[0114] As shown in Figure 6, the protection device 10 can be a rotary protection device, which is composed of a knob 141, a connecting rod 142, a P-level linkage switch 100, a first trip unit 102, a second trip unit 103, a switch interface unit 105, etc., connected to each other; the first trip unit 102 can be set on one side of the second trip unit 103, as long as it can realize the connection between the switch interface unit 105 and the P-level linkage switch 100.

[0115] Specifically, the knob 141 is connected to the connecting rod 142 and can be used to drive the connecting rod 142 to rotate. The connecting rod 142 connects the knob 141 and the P-level interlocking switch 100. The switch interface unit 105 can adopt a four-wire interface or a three-wire interface to receive corresponding control signals and control the corresponding trip unit to perform the tripping action. After receiving the corresponding control signal, each trip unit can control the P-level interlocking switch 100 to disconnect.

[0116] In this P-level interlocking switch 100, each switch 101 includes a first pin and a second pin. The first pin can be used to connect to the positive or negative terminal of the corresponding DC power supply, and the second pin can be used to connect to the corresponding terminal on the power supply side of the subsequent conversion circuit. Each switch 101 includes a moving contact and a stationary contact, wherein the moving contact is mechanically connected to the connecting rod 142. In one example, the switches 101 in the P-level interlocking switch 100 are stacked along a first direction. When the connecting rod 142 rotates, the moving and stationary contacts inside each switch 101 simultaneously close or open, realizing the connection or disconnection between the DC power supply and the subsequent conversion circuit.

[0117] After the first trip unit 102 is activated, the P-level linkage switch 100 can be operated via the knob 141 to close the moving and stationary contacts inside each switch 101, thus connecting the DC power supply to the subsequent conversion circuit. After the second trip unit 103 is activated, the moving and stationary contacts inside each switch 101 cannot be closed via the knob 141, thus preventing the connection between the DC power supply and the subsequent conversion circuit.

[0118] In practical applications, the protection device 10 can also use other structures. Figure 6 is only one possible example and is not limited to it. In addition, a scheme in which each switch is independent but simultaneously receives the same control is also within the scope of protection of this application.

[0119] As one possible implementation, the first trip unit 102 and the second trip unit 103 can be any one of a flux trip unit, an undervoltage trip unit, an overvoltage trip unit, or a shunt trip unit. These trip units can all use a power supply signal as the corresponding control signal to control their tripping action. Furthermore, the first trip unit 102 and the second trip unit 103 can be of the same type or different types of trip units; this depends on the specific application environment and is within the scope of protection of this application.

[0120] In practical applications, the protection device 10 can be any isolation device with controllable disconnection function, such as circuit breakers, relays, excitation fuses, etc. This application does not limit its specific category, but depends on its specific application environment, and all of them are within the protection scope of this application.

[0121] Another embodiment of this application also provides a combiner box, as shown in FIG7, including: a control unit 20, a busbar 31, and at least one (shown as an example in FIG7) protection device 10 for a new energy system as described in any of the above embodiments; wherein:

[0122] The busbar 31 is connected to the input terminal of the combiner box via a corresponding protection device 10 to access at least one DC power source. This DC power source can be a photovoltaic unit, such as a photovoltaic module or photovoltaic string; it can also be an energy storage unit, such as a battery pack or battery cluster. No specific limitation is made here, depending on the specific application environment. The specific structure and principle of the protection device 10 can be found in the above embodiments and will not be repeated here. The busbar 31 is connected to the output terminal of the combiner box; the output terminal of the combiner box can be connected to the power grid and / or load via an inverter, which includes the DC / AC conversion circuit 40 shown in Figure 7 or Figure 8. The protection device is controlled by the control unit 20.

[0123] In practical applications, the combiner box may also be equipped with at least one DC / DC converter circuit 30, which is connected between the corresponding protection device 10 and the busbar 31; the DC / DC converter circuit 30 is also controlled by the control unit 20. When the number of DC / DC converter circuits 30 is greater than 1, the output terminals of each DC / DC converter circuit 30 are connected in parallel to the output terminal of the combiner box through the busbar 31.

[0124] In one example, each DC power supply can be connected to the input terminal of the corresponding DC / DC converter circuit 30 through at least one switch 101 in the corresponding protection device 10. For example, a corresponding switch 101 can be provided in the positive or negative transmission branch between each DC power supply and the input terminal of the corresponding DC / DC converter circuit 30; or, a corresponding switch 101 can be provided in the positive and negative transmission branches between each DC power supply and the input terminal of the corresponding DC / DC converter circuit 30 respectively. It depends on the specific application environment, and all of them are within the protection scope of this application.

[0125] In addition, when the number of DC / DC converter circuits 30 is greater than 1, each DC / DC converter circuit 30 can share the same protection device 10 (as shown in Figure 7), or each can use a corresponding protection device 10 (as shown in Figure 8), or they can be grouped together and use corresponding protection devices 10 (not shown). It can be determined according to the number of DC power supplies connected to each DC / DC converter circuit 30 and the number of switches 101 in the protection device 10. No specific limitation is made here, and all are within the protection scope of this application.

[0126] Taking a photovoltaic (PV) unit as an example, PV power generation is a technology that uses the photovoltaic effect to convert light energy into electrical energy. A PV system typically includes PV modules, cables, inverters, and AC power distribution equipment. In practical applications, to obtain higher output voltage, multiple PV modules are usually connected in series to form a PV string; to obtain higher output current, multiple PV strings are usually connected in parallel and connected to the inverter via cables. For high-power centralized inverters, the DC side can be connected to multiple PV strings through one or more combiner boxes. Furthermore, by using the combiner box provided in this embodiment, the protection device 10 can prevent on-site personnel from closing the switch 101 via the operating mechanism 104 after the switch is disconnected, thereby reducing the risk of secondary damage to the equipment and fire. Additionally, when the protection device 10 includes two types of trip units, it can also achieve classified protection for different fault types. When the combiner box includes a DC / DC conversion circuit 30, it can also achieve MPPT (Maximum Power Point Tracking) for the corresponding PV string, realizing intelligent combiner operation.

[0127] Based on the above embodiments, the control unit 20 in the combiner box can be as shown in FIG9 (taking FIG1 as an example), including: a controller 201, a data acquisition module 202, and a drive circuit 203; wherein:

[0128] The controller 201 acquires voltage and / or current information at at least one location in the combiner box via the acquisition module 202, such as the corresponding information at the input or output terminal of the DC / DC converter circuit 30. That is, the controller 201 acquires the corresponding information via the acquisition module 202 to determine whether the new energy system has experienced the aforementioned first or second type of fault. For cases where the DC power supply is a photovoltaic unit, the information acquired by the acquisition module 202 includes, but is not limited to, one or more of the following: the current of the photovoltaic string, the input voltage of the DC / DC converter circuit 30, the input current of the DC / DC converter circuit 30, and the voltage of the bus capacitor; the specific application environment will determine the appropriate information, and all are within the scope of protection of this application.

[0129] The controller 201 outputs control signals to the DC / DC converter circuit 30 and the protection device 10 through the drive circuit 203, thereby controlling the operating state of the DC / DC converter circuit 30 and the on / off state of the protection device 10. For example, the controller 201 can issue a first control signal and a second control signal to control the protection device 10 to disconnect through the drive circuit 203. Specifically, the controller 201 issues a first control signal when a first type of fault is detected, and issues a second control signal when a second type of fault is detected.

[0130] Both the first control signal and the second control signal can be power supply signals, such as voltage signals or current signals.

[0131] In practical applications, the drive circuit 203 may include one or more drive modules. One drive module can drive one controlled device or multiple controlled devices that are simultaneously switched on and off. For the DC / DC converter circuit 30, the controlled device refers to its internal power switching transistor; for the protection device 10, the controlled device refers to its internal switch 101. The drive module may include controllable switching devices, such as transistors, MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), IGBTs (Insulated Gate Bipolar Transistors), relays, etc.; no limitation is made here, depending on the specific application environment, and all are within the scope of protection of this application.

[0132] In one example, when the controller 201 outputs a first control signal to the protection device 10 via the drive circuit 203, its function of outputting a second control signal to the protection device 10 is restricted. That is, when the controller 201 issues a first control signal to activate the second trip unit 103, it cannot issue a second control signal, thus avoiding the need to disassemble the combiner box housing to adjust the reset switch 106 to the first position in the above embodiment under non-serious fault conditions. When the controller 201 issues a second control signal to activate the second trip unit 103, the controller 201 can either issue a first control signal to activate the first trip unit 102 or not issue a first control signal, thus preventing the first trip unit 102 from activating.

[0133] In addition, the control unit 20 may also include, as shown in Figure 9, a switching power supply 204; the output terminal of the switching power supply 204 is connected to the power supply terminal of the drive circuit 203, and is used to provide corresponding electrical energy to the drive circuit 203. The connection position of the input terminal of the switching power supply 204 is not limited, that is, the power source of the switching power supply 204 is not limited, it can be a DC power supply, or the DC bus connected to the DC side of the inverter, or the AC side of the inverter; it depends on the specific application environment, and all are within the protection scope of this application.

[0134] As described in the above embodiments, the combiner box may further include: a housing; the housing may adopt the structure shown in FIG3, namely including an outer shell structure 21 and a cover plate 22; the DC / DC conversion circuit 30 and the control unit 20 are disposed inside the outer shell structure 21, and most of the components of the protection device 10, such as the trip unit and the P-level linkage switch 100, are also disposed inside the outer shell structure 21; at the same time, in order to ensure that the operating mechanism 104 of the protection device 10 can be manually operated, a through hole may be provided on the outer shell structure 21 for the connecting rod 142 of the operating mechanism 104 in each protection device 10 to pass through, thereby allowing the knob 141 of the operating mechanism 104 in the protection device 10 to be located outside the housing. In addition, a sealing strip or sealant may be provided at the connection between the cover plate 22 and the outer shell structure 21 to form a sealed environment inside the outer shell structure 21.

[0135] In practical applications, the housing of the junction box can also be implemented in other ways, and is not limited to the structure shown in Figure 3. As long as it can achieve the protection function of its internal components and allow the operating mechanism 104 of the protection device 10 to be manually operated, it is within the scope of protection of this application.

[0136] In addition, the reset switch 106 in the protection device 10 can also be installed inside the housing. This can prevent the on-site personnel from directly moving the reset switch 106 from the second position to the first position after the protection device 10 is disconnected, which would cause the protection device 10 to close and result in secondary damage or fire.

[0137] Furthermore, this embodiment can utilize the existing control unit and trip switch in the combiner box without adding additional devices, thus not significantly increasing the cost of the system.

[0138] Another embodiment of this application also provides a power converter, as shown in FIG10, including: a control unit 20, a DC / AC conversion circuit 40, and at least one (as shown in FIG10 as an example) protection device 10 of the new energy system as described in any of the above embodiments; wherein:

[0139] The DC side of the DC / AC conversion circuit 40 is connected to the input terminal of the power converter via a corresponding protection device 10 to access at least one DC power source. This DC power source can be a photovoltaic unit or an energy storage unit, and is not limited here. The specific structure and principle of the protection device 10 can be found in the above embodiments, and will not be repeated here.

[0140] The AC side of the DC / AC conversion circuit 40 serves as the output terminal of the power converter; the output terminal of the power converter is used to connect to the power grid and / or a load.

[0141] In practical applications, as shown in Figure 10, the power converter may further include at least one DC / DC conversion circuit 30. This DC / DC conversion circuit 30 is connected between the corresponding protection device 10 and the DC / AC conversion circuit 40. When the number of DC / DC conversion circuits 30 is greater than one, each DC / DC conversion circuit 30 can share the same protection device 10 (as shown in Figure 10), or each can use a corresponding protection device 10 (not shown), or they can be grouped together using corresponding protection devices 10 (not shown). The number of protection devices 10 can be determined based on the number of DC power supplies connected to each DC / DC conversion circuit 30 and the number of switches 101 within the protection device 10; no specific limitation is made here, and all are within the scope of protection of this application. Furthermore, when the number of DC / DC conversion circuits 30 is greater than one, the output terminals of each DC / DC conversion circuit 30 can be connected in parallel to the DC / AC conversion circuit 40 via a DC bus.

[0142] It is worth noting that the naming of the input and output terminals of each conversion circuit in this application is only for distinguishing their two sides and is not a restriction on the direction of power transmission. For example, when the DC power supply is an energy storage unit, its discharge process will cause the electrical energy to be transmitted to the power grid and / or load in sequence through the corresponding DC / DC conversion circuit 30 and the DC / AC conversion circuit 40, or to the DC bus after being transmitted through the corresponding DC / DC conversion circuit 30 to supply power to the DC load; while its charging process will cause the electrical energy to be charged by the DC / AC conversion circuit 40 and the corresponding DC / DC conversion circuit 30 in reverse from the power grid, or by other power sources through the DC bus in reverse through the corresponding DC / DC conversion circuit 30.

[0143] The DC / AC conversion circuit 40, the DC / DC conversion circuit 30, and the protection device 10 are each controlled by the control unit 20.

[0144] When the DC power source is a photovoltaic unit, the power converter can be called a photovoltaic inverter; when the DC power source is an energy storage unit, the power converter can be called an energy storage converter.

[0145] Similar to the combiner box described in the above embodiments, this power converter, by employing the protection device 10 described in the above embodiments, can prevent on-site personnel from closing the switch 101 through the operating mechanism 104 after the protection device 10 is disconnected, thereby reducing the risk of secondary damage to the equipment and causing a fire; in addition, the protection device 10 includes two types of trip units, which can also realize classified protection for different types of faults.

[0146] Similar to the above embodiment, the control unit 20 in the power converter can also be as shown in 9, including: a controller 201, a data acquisition module 202, and a drive circuit 203; wherein, the controller 201 acquires voltage acquisition information and / or current acquisition information at at least one location in the power converter through the data acquisition module 202, such as the corresponding information of at least one side of the DC / AC conversion circuit 40 and / or at least one side of the DC / DC conversion circuit 30; the controller 201 outputs control signals for the DC / AC conversion circuit 40, the DC / DC conversion circuit 30, and the protection device 10 through the drive circuit 203.

[0147] For cases where the DC power supply is a photovoltaic unit, the information collected by the acquisition module 202 includes, but is not limited to, one or more of the following: the current of the photovoltaic string, the input voltage of the DC / DC conversion circuit 30, the input current of the DC / DC conversion circuit 30, the voltage of the bus capacitor, the AC output current of the DC / AC conversion circuit 40, and the internal temperature of the power converter; depending on the specific application environment, all of which are within the protection scope of this application.

[0148] Similar to the above embodiments, when the controller 201 outputs the first control signal for the protection device 10 through the drive circuit 203, the output function of the second control signal for the protection device 10 is restricted.

[0149] Similar to the above embodiments, the control unit 20 may also include the switching power supply 204 shown in FIG9; the output terminal of the switching power supply 204 is connected to the power supply terminal of the drive circuit 203.

[0150] Similar to the above embodiments, the power converter may also include: a housing; and a knob 141 of the operating mechanism 104 in the protection device 10, located outside the housing.

[0151] The connection relationships and operating principles of the various parts within this power converter can be found in the above-described embodiment of the combiner box, and will not be repeated here.

[0152] This embodiment can utilize the existing control unit and trip switch in the power converter without adding additional devices and without significantly increasing the cost of the system.

[0153] Another embodiment of this application provides a protection method for a new energy system, which is applied to the combiner box as described in the above embodiments or the control unit in the power converter as described in the above embodiments; as shown in FIG11, the protection method includes:

[0154] S101. Acquire the collected information from the combiner box or power converter.

[0155] As described in the above embodiments, the collected information may include one or more of the following: the current of the photovoltaic string, the input voltage of the DC / DC conversion circuit, the input current of the DC / DC conversion circuit, the voltage of the bus capacitor, the AC output current of the DC / AC conversion circuit, and the internal temperature of the power converter; depending on the specific application environment, all of which are within the protection scope of this application.

[0156] S102. Based on the collected information, determine whether the new energy system has experienced a first-class or second-class fault.

[0157] In practical applications, the first type of fault may include at least one of the following: a grounding fault in the DC power supply connected to the combiner box or power converter, a short-circuit fault in the DC power supply, and a reverse connection fault in the DC power supply. The second type of fault may include at least one of the following: a conversion circuit fault in the combiner box or power converter, and a bus capacitor fault in the power converter.

[0158] For specific judgment procedures, please refer to existing technologies; no specific details are provided here.

[0159] If the new energy system experiences a Type I fault, then execute S103. If the new energy system experiences a Type II fault, then execute S104.

[0160] S103, Outputs the first control signal for the protection device in the combiner box or power converter.

[0161] The first control signal can be a power supply signal, such as a voltage signal or a current signal.

[0162] S104, Output the second control signal for the protection device.

[0163] The second control signal can be a power signal, such as a voltage signal or a current signal.

[0164] In conjunction with the above embodiments, the control unit, specifically its internal controller, can classify faults into first-class and second-class faults based on their severity. When a second-class fault with a significant impact is identified, a second control signal is issued to activate the second trip unit, causing the switch to disconnect and remain open, preventing secondary damage or fire caused by on-site personnel re-closing the protection device via the operating mechanism. Conversely, when a first-class fault with a minor impact is identified, a first control signal is issued to activate the first trip unit, causing the switch to disconnect. After on-site personnel eliminate grounding and short-circuit faults, they can re-close the protection device via the operating mechanism, allowing the new energy system to resume normal operation.

[0165] By classifying faults and combining dual control signals and dual trip units, two different protections can be provided for two types of faults. Furthermore, it ensures that on-site personnel can close the switch and restore the power converter to operation when the fault in the new energy system can be cleared, while also preventing on-site personnel from closing the switch when a serious fault occurs in the new energy system, which could lead to secondary failure or even fire.

[0166] Furthermore, this protection method can also execute S105 if a Type I fault occurs in the new energy system.

[0167] S105. Set the output function of the second control signal to a restricted state.

[0168] That is, when the controller sends a first control signal to activate the first trip unit, it is configured not to send a second control signal. When the controller sends a second control signal to activate the second trip unit, it can either send the first control signal to activate the first trip unit or not send the first control signal at all, thus preventing the first trip unit from activating. This depends on the specific application environment, and all are within the scope of protection of this application.

[0169] To facilitate the troubleshooting by on-site staff or technical personnel, this protection method may also include, after determining that a fault has occurred in the new energy system, the following steps: controlling the combiner box or power converter to shut down, and / or reporting the fault information.

[0170] In practical applications, when a fault occurs in a new energy system, all equipment within the system can be shut down to avoid the risk of electric shock for on-site personnel or professional technicians when troubleshooting. If the control unit is a combiner box, it can control the DC / DC converter circuit within the combiner box to stop operating. If the control unit is a power converter, it can control both the DC / DC converter circuit and the DC / AC converter circuit within the combiner box to stop operating.

[0171] Reporting fault information makes it easier for on-site staff or professional technicians to pinpoint the location of the fault, facilitating fault elimination and saving maintenance time.

[0172] Another embodiment of this application also provides a control device, as shown in FIG12. The control device may include a memory 211 and a processor 212. The processor 212 may be connected to a combiner box or power converter and may control the protection devices in the combiner box or power converter. In practical applications, the processor 212 may also control all controlled devices in the combiner box or power converter, such as the switches in the protection devices and the power switching transistors in each conversion circuit.

[0173] The memory 211 can specifically be RAM (random access memory), flash memory, ROM (read only memory), EPROM (Electronic Programmable ROM, a type of non-volatile read-only memory), registers, hard disks, removable disks, etc.

[0174] The memory 211 is used to store computer instructions. When the computer instructions stored in the memory 211 are executed by the processor 212, the processor 212 can be used to execute the protection method of the new energy system described in any of the above embodiments. The memory 211 can also store data, such as various acquisition information and fault classification information involved in the above embodiments.

[0175] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, DSL (digital subscriber line)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media, such as floppy disks, hard disks, and magnetic tapes; or, the available media can be semiconductor media, such as SSDs (solid state disks); the available media can also be other media, without limitation.

[0176] Another embodiment of this application provides a computer-readable storage medium storing a computer program that is loaded by a processor to execute the protection method for the new energy system as described in any of the above embodiments.

[0177] That is, the computer-readable storage medium is used to store the methods or algorithms provided in the above embodiments. Specifically, it can be RAM, flash memory, ROM, EPROM, registers, hard disk, removable disk, or any other form of storage medium in the art.

[0178] Similar or identical parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the description of the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment solution according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0179] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0180] The features described above regarding the disclosed embodiments can be substituted for or combined with each other to enable those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A protection device for a new energy system, characterized in that, include: The system comprises a first trip unit, a second trip unit, an operating mechanism, at least one switch, and at least one switch interface unit; wherein... The operating mechanism is used to accept operations that change the on / off state of the switch; The input terminal of the first trip unit receives a first control signal through the corresponding switch interface unit; The first control signal is sent by the controller of the protection device in the equipment belonging to the new energy system; The input terminal of the second trip unit receives a second control signal through the corresponding switch interface unit; the second control signal is sent by the controller. Upon receiving the first control signal, the first trip unit performs a tripping action, controlling the switch to disconnect; Upon receiving the second control signal, the second trip unit performs a tripping action, controlling the switch to disconnect and maintaining the switch in the open state.

2. The protection device for a new energy system according to claim 1, characterized in that, The second trip unit is equipped with a reset switch; When the second trip unit performs the tripping action, it controls the reset switch to maintain the switch in the open state.

3. The protection device for a new energy system according to claim 2, characterized in that, The manual operation terminal of the reset switch is located inside or outside the housing of the protective device belonging to the new energy system.

4. The protection device for a new energy system according to claim 1, characterized in that, The first trip unit and the second trip unit are respectively connected to different switch interface units; or... The first trip unit and the second trip unit are connected to the same switch interface unit; and the input terminal of the first trip unit is connected to the first interface in the switch interface unit; the input terminal of the second trip unit is connected to the second interface in the switch interface unit.

5. The protection device for a new energy system according to claim 4, characterized in that, The first interface and the second interface are independent of each other, or the first interface and the second interface share a positive or negative interface.

6. The protection device for a new energy system according to any one of claims 1 to 5, characterized in that, The number of switches is greater than 1, and all the switches are linked together.

7. The protection device for a new energy system according to any one of claims 1 to 5, characterized in that, The operating mechanism includes: a knob and a connecting rod; The knob is for manual operation; The connecting rod enables a mechanical connection between the knob and the switch.

8. A junction box, characterized in that, include: Busbar, control unit, and at least one protection device for the new energy system as described in any one of claims 1 to 7; The busbar is connected to the input terminal of the combiner box via the corresponding protection device to access at least one DC power source; The busbar is connected to the output end of the junction box; The protection device is controlled by the control unit.

9. The combiner box according to claim 8, characterized in that, Also includes: At least one DC / DC converter circuit; The DC / DC converter circuit is connected between the corresponding protection device and the busbar; The DC / DC conversion circuit is controlled by the control unit.

10. The combiner box according to claim 8 or 9, characterized in that, The control unit includes: a controller, a data acquisition module, and a drive circuit; The controller acquires voltage and / or current information at at least one location in the combiner box through the acquisition module; The controller outputs control signals through the drive circuit.

11. The combiner box according to claim 10, characterized in that, When the controller outputs a first control signal for the protection device through the drive circuit, its function of outputting a second control signal for the protection device is restricted.

12. The combiner box according to claim 10, characterized in that, The control unit further includes: a switching power supply; the output terminal of the switching power supply is connected to the power supply terminal of the drive circuit.

13. The combiner box according to claim 8 or 9, characterized in that, Also includes: case; The knob of the operating mechanism in the protective device is located outside the housing.

14. A power converter, characterized in that, include: The control unit, the DC / AC conversion circuit, and at least one protection device for the new energy system as described in any one of claims 1 to 7; The DC side of the DC / AC conversion circuit is connected to the input terminal of the power converter through the corresponding protection device to access at least one DC power supply. The AC side of the DC / AC conversion circuit serves as the output terminal of the power converter. The DC / AC conversion circuit and the protection device are respectively controlled by the control unit.

15. The power converter according to claim 14, characterized in that, Also includes: At least one DC / DC converter circuit; The DC / DC converter circuit is connected between the corresponding protection device and the DC / AC converter circuit on the DC side. The DC / DC conversion circuit is controlled by the control unit.

16. The power converter according to claim 14 or 15, characterized in that, The control unit includes: a controller, a data acquisition module, and a drive circuit; The controller acquires voltage and / or current acquisition information at at least one location in the power converter through the acquisition module; The controller outputs control signals through the drive circuit.

17. The power converter according to claim 15, characterized in that, When the controller outputs a first control signal for the protection device through the drive circuit, its function of outputting a second control signal for the protection device is restricted.

18. The power converter according to claim 15, characterized in that, The control unit further includes: a switching power supply; the output terminal of the switching power supply is connected to the power supply terminal of the drive circuit.

19. The power converter according to claim 14 or 15, characterized in that, Also includes: case; The knob of the operating mechanism in the protective device is located outside the housing.

20. A protection method for a new energy system, characterized in that, The protection method is applied to a combiner box as described in any one of claims 8 to 13 or a power converter as described in any one of claims 14 to 19; the protection method includes: Acquire the collected information from the combiner box or the power converter; Based on the collected information, it is determined whether the new energy system has experienced a first-type fault or a second-type fault; If the new energy system experiences the first type of fault, a first control signal is output for the protection device in the combiner box or the power converter. If the new energy system experiences the second type of fault, a second control signal is output to the protection device.

21. The protection method for a new energy system according to claim 20, characterized in that, The second type of fault includes at least one of the following: The converter box or the power converter is faulty; The power converter has a bus capacitor fault.

22. The protection method for a new energy system according to claim 20, characterized in that, The first type of fault includes at least one of the following: A grounding fault occurred in the DC power supply connected to the combiner box or the power converter. The DC power supply experienced a short circuit fault. The DC power supply experienced a reverse connection fault.

23. The protection method for a new energy system according to any one of claims 20 to 22, characterized in that, After determining that the new energy system has experienced a Type I fault, the process also includes: The output function of the second control signal is placed in a restricted state.

24. The protection method for a new energy system according to any one of claims 20 to 22, characterized in that, After determining that the new energy system has malfunctioned, the following steps are also included: Control the junction box or the power converter to shut down, and / or report fault information.

25. A control device, characterized in that, It includes a processor and a memory, the memory being used to store programs, instructions, or code, and the processor being used to execute the programs, instructions, or code in the memory to perform the protection method for the new energy system as described in any one of claims 20 to 24.

26. A computer-readable storage medium, characterized in that, The system contains a computer program that is loaded by a processor to execute the protection method for the new energy system as described in any one of claims 20 to 24.

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