Protection device of new energy system and related device

Abstract

The utility model discloses a protection device of a new energy system and a related device, and relates to the technical field of power electronics. In the protection device, an actuator is used for receiving an operation for changing the on-off state of a switch; the release can receive control signals through the switch interface unit, and the release is in different stable states under different control signals. Wherein one stable state is a first state in which the switch is switched off and can be switched on through the actuator, and the other stable state is a second state in which the switch is switched off and cannot be switched on through the actuator; and in the second state, the field staff cannot perform manual operation of closing the switch through the actuator any more, so that secondary damage to equipment and lines and the risk of causing a fire disaster are reduced. Moreover, the release enters different stable states through different control signals, so that the new energy system can respectively realize different protection functions under different fault types.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics, in particular to a protection device of a new energy system and related devices. BACKGROUND

[0002] In a new energy system, a DC power supply is generally connected to a subsequent conversion circuit through a corresponding switch. When the DC power supply or the conversion circuit fails, the switch can be opened by a controller to protect the new energy system. However, after the switch is opened, the on-site staff often manually closes the switch, which may cause secondary damage to the equipment and the line, and even cause a fire, endangering property and personal safety. CONTENT OF THE INVENTION

[0003] In view of the above problems, the present application provides a protection device of a new energy system and related devices to reduce the risk of electric shock and fire. The specific scheme is as follows:

[0004] The first aspect of the present application provides a protection device of a new energy system, comprising: a trip unit, a switch interface unit, an operating mechanism, an operating device, and at least one switch; wherein,

[0005] One end of the operating device acts on the operating mechanism, so that the operating mechanism can change the on-off state of the switch; the other end of the operating device is used to accept the operation of changing the on-off state of the switch;

[0006] The input end of the trip unit receives a control signal through the switch interface unit; the control signal is sent by a controller in the device to which the new energy system belongs;

[0007] The output end of the trip unit acts on the operating mechanism, so that the operating mechanism can be switched from a closed state to a tripped open state; and the trip unit and the operating mechanism correspond one-to-one;

[0008] The trip unit is in different stable states under different control signals; wherein, there is a first state in which the switch is opened and can be closed by the operating device, and there is a second state in which the switch is opened and cannot be closed by the operating device.

[0009] In one possible implementation, the trip unit includes a bidirectional magnetic holding mechanism.

[0010] In one possible implementation, when the control signal is a first control signal, the bidirectional magnetic holding mechanism is in the first state;

[0011] The bidirectional magnetic holding mechanism is in the second state when the control signal is a second control signal.

[0012] The moving directions of a tripping shaft in the bidirectional magnetic holding mechanism are opposite under the first control signal and the second control signal.

[0013] The bidirectional magnetic holding mechanism is in an intermediate holding state with the tripping shaft in the middle when no control signal is received.

[0014] In a possible implementation, the bidirectional magnetic holding mechanism is in the first state when the control signal includes a third control signal that arrives first and a fourth control signal that arrives later.

[0015] The bidirectional magnetic holding mechanism is in the second state when the control signal is the third control signal.

[0016] The moving directions of a tripping shaft in the bidirectional magnetic holding mechanism are opposite under the third control signal and the fourth control signal; the third control signal is a signal that causes the switch to be disconnected and cannot be closed by the actuator, and the fourth control signal is a signal that causes the bidirectional magnetic holding mechanism to reset to a state in which the switch can be closed by the actuator.

[0017] In a possible implementation, the bidirectional magnetic holding mechanism is in the first state when the control signal is a fifth control signal.

[0018] The bidirectional magnetic holding mechanism is in the second state when the control signal is a sixth control signal.

[0019] The moving directions of a tripping shaft in the bidirectional magnetic holding mechanism are the same under the fifth control signal and the sixth control signal; the moving distance of the tripping shaft is less than a preset value under the fifth control signal, so that the bidirectional magnetic holding mechanism is automatically reset to a state in which the switch can be closed by the actuator after the switch is disconnected.

[0020] In a possible implementation, a reset switch is arranged on the tripper; the state of the reset switch includes a first position and a second position.

[0021] The switch can be closed by the actuator when the reset switch is in the first position.

[0022] The switch cannot be closed by the actuator when the reset switch is in the second position.

[0023] In a possible implementation, the manual operating end of the reset switch is located inside a shell of a device to which the new energy system belongs.

[0024] In a possible implementation, the bidirectional magnetic holding mechanism comprises a magnetic yoke, a coil, a permanent magnet, a moving iron core, a static iron core and a spring.

[0025] The coil and the permanent magnet are arranged inside the magnetic yoke, and the permanent magnet is located in the middle of the coil.

[0026] The moving iron core and the static iron core are arranged inside the coil and the permanent magnet.

[0027] The spring is arranged between the moving iron core and the static iron core.

[0028] The moving iron core is provided with a tripping shaft.

[0029] In a possible implementation, the control signal is a voltage signal or a current signal.

[0030] In a possible implementation, the polarities of different control signals are opposite.

[0031] In a possible implementation, the number of switches is greater than 1, and each switch is linked.

[0032] In a possible implementation, the actuator comprises a knob and a connecting rod.

[0033] The knob is used to accept an operation of changing the on-off state of the switch.

[0034] The connecting rod realizes mechanical connection between the knob and the operating mechanism.

[0035] The second aspect of the application provides a power transmission device of a new energy system, comprising a main circuit, a control unit and at least one protection device of a new energy system as described in the first aspect or any implementation form of the first aspect.

[0036] The main circuit is connected to at least one direct-current power supply through the corresponding protection device.

[0037] The protection device is controlled by the control unit.

[0038] In a possible implementation, the control unit comprises a controller, an acquisition module and a driving circuit.

[0039] The acquisition module is used to acquire voltage information and / or current information of at least one position in the power transmission device.

[0040] An output end of the acquisition module is connected to an input end of the controller.

[0041] The output of the controller is connected to the input of the drive circuit;

[0042] The output of the drive circuit is connected to the switch interface unit of the protection device.

[0043] In a possible implementation, the controller is in a limited state for the output function of another control signal when outputting a control signal.

[0044] In a possible implementation, the control unit further comprises a switch power supply, and the output of the switch power supply is connected to the power supply end of the drive circuit.

[0045] In a possible implementation, the power transmission device further comprises a housing.

[0046] The connecting rod of the operating mechanism of the protection device passes through the through hole of the housing.

[0047] The knob of the operating mechanism is located outside the housing.

[0048] In a possible implementation, the main circuit comprises a bus bar.

[0049] Alternatively, the main circuit comprises a bus bar and at least one DC / DC conversion circuit; the input of the DC / DC conversion circuit is connected to at least one DC power supply through the corresponding protection device, the output of the DC / DC conversion circuit is connected to the bus bar; and the DC / DC conversion circuit is controlled by the control unit.

[0050] In a possible implementation, the main circuit comprises a DC / AC conversion circuit; the DC side of the DC / AC conversion circuit is connected to at least one DC power supply through the corresponding protection device; the AC side of the DC / AC conversion circuit serves as the AC side of the main circuit; and the DC / AC conversion circuit is controlled by the control unit.

[0051] Alternatively, the main circuit comprises a DC / AC conversion circuit and at least one DC / DC conversion circuit; the input of the DC / DC conversion circuit is connected to at least one DC power supply through the corresponding protection device, the output of the DC / DC conversion circuit is connected to the DC side of the DC / AC conversion circuit, and the AC side of the DC / AC conversion circuit serves as the AC side of the main circuit; and the DC / DC conversion circuit and the DC / AC conversion circuit are respectively controlled by the control unit.

[0052] By means of the technical scheme, the protection device of the new energy system provided by the application comprises a trip unit, a switch interface unit, an operating mechanism, an operating mechanism and at least one switch; wherein the operating mechanism is used for accepting the operation of changing the on-off state of the switch; the trip unit can receive the control signal through the switch interface unit, and the trip unit is in different stable states under different control signals; wherein one stable state is a first state in which the switch is disconnected and can be closed by the operating mechanism, and another stable state is a second state in which the switch is disconnected and cannot be closed by the operating mechanism; the second state makes it impossible for the field staff to manually operate the switch to close it through the operating mechanism, thereby reducing the risk of secondary damage to the equipment and lines and causing fire. Moreover, the trip unit enters different stable states through different control signals, so that the new energy system can realize different protection functions under different fault categories. BRIEF DESCRIPTION OF DRAWINGS

[0053] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent by referring to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals refer to the same or similar elements. It should be understood that the drawings are schematic, and the original and elements are not necessarily drawn according to the scale.

[0054] Figure 1 A structural schematic diagram of the protection device of the new energy system provided by the embodiment of the application;

[0055] Figure 2 Another structural schematic diagram of the protection device of the new energy system provided by the embodiment of the application;

[0056] Figure 3 A structural schematic diagram of the trip unit in the protection device of the new energy system provided by the embodiment of the application;

[0057] Figure 4 A structural schematic diagram of the trip unit in the protection device of the new energy system provided by the embodiment of the application; Figure 3 A structural schematic diagram of the trip unit in the protection device of the new energy system provided by the embodiment of the application;

[0058] Figure 5 Another structural schematic diagram of the trip unit in the protection device of the new energy system provided by the embodiment of the application;

[0059] Figure 6 A structural schematic diagram of the trip unit in the protection device of the new energy system provided by the embodiment of the application; Figure 5 A structural schematic diagram of the trip unit in the protection device of the new energy system provided by the embodiment of the application;

[0060] Figure 7 A structural schematic diagram of the housing of the device to which the protection device of the new energy system provided by the embodiment of the application belongs;

[0061] Figure 8A structural schematic diagram of a protection device of a new energy system provided by an embodiment of the present application;

[0062] Figure 9 A structural schematic diagram of a power transmission device of a new energy system provided by an embodiment of the present application;

[0063] Figure 10 A structural schematic diagram of a power transmission device of a new energy system provided by an embodiment of the present application;

[0064] Figure 11 A structural schematic diagram of a power transmission device of a new energy system provided by an embodiment of the present application;

[0065] Figure 12 A structural schematic diagram of a power transmission device of a new energy system provided by an embodiment of the present application;

[0066] Figure 13 A structural schematic diagram of a power transmission device of a new energy system provided by an embodiment of the present application;

[0067] Figure 14 A structural schematic diagram of a power transmission device of a new energy system provided by an embodiment of the present application;

[0068] Figure 15 A structural schematic diagram of a power transmission device of a new energy system provided by an embodiment of the present application;

[0069] Figure 16 A structural schematic diagram of a power transmission device of a new energy system provided by an embodiment of the present application; DETAILED DESCRIPTION

[0070] The embodiments of the present application will be described in detail with reference to the drawings. The terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0071] The embodiments of the present application will be described in detail with reference to the drawings. The terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0072] The terms "first", "second", and the like in the description and in the claims of the present application and above drawings are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the present application are capable of functioning in other sequences, except where it is inherent from the disclosure. Furthermore, the terms "comprise", "comprising", "include", "including", and the like are intended to cover non-exclusive inclusions, such that a process, method, system, product, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, system, product, or apparatus.

[0073] The embodiments of the present application provide a protection device of a new energy system to reduce the risk of electric shock and fire.

[0074] The specific solutions are as follows:

[0075] As shown in Figure 1 The protection device 10 of the new energy system comprises a trip unit 102, a switch interface unit 103, an operating mechanism 105, an operating device 104, and at least one (one is taken as an example in the figure) switch 101; wherein:

[0076] One end of the operating device 104 acts on the operating mechanism 105, so that the operating mechanism 105 can change the on-off state of the switch 101; the other end of the operating device is used for receiving an operation; the operation can be used to change the on-off state of the switch 101; in actual application, the operation can be manual operation or automatic control, which 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 device 104.

[0077] The input end of the trip unit 102 receives an external control signal through the switch interface unit 103; the control signal can be specifically from a controller of the device to which the protection device 10 belongs in the new energy system; the device to which the protection device 10 belongs in the new energy system can be a power converter such as an inverter or a current transformer, or can also be a bus box, which is not limited here. The controller can send a corresponding control signal to the switch interface unit 103 according to the current state of the device it belongs to. The control signal can be a power signal for powering the trip unit 102, and in actual application, the power signal can be a voltage signal or a current signal, which is not limited here.

[0078] The output end of the tripping device 102 acts on the operating mechanism 105, so that the operating mechanism 105 can be switched from the closed state to the tripped open state, and then the switch 101 is tripped; that is, the tripping device 102 can control the switch 101 to trip through the operating mechanism 105 according to the corresponding control signal. Moreover, the tripping device 102 corresponds to the operating mechanism 105 one by one, that is, the number of the tripping device 102 and the operating mechanism 105 is 1.

[0079] The tripping device 102 is in different stable states under different control signals; among them, there is a first state that makes the switch 101 trip and can be closed through the actuator 104, and there is another second state that makes the switch 101 trip and cannot be closed through the actuator 104. That is, the tripping device 102 will perform a tripping action after receiving any kind of control signal, and control the switch 101 to trip; and different control signals will make the switch 101 trip and be in different states, specifically, when the switch 101 can be closed again through the actuator 104, it corresponds to the first state of the tripping device 102; and when the switch 101 is maintained in an open state and cannot be closed again through the actuator 104, it corresponds to the second state of the tripping device 102.

[0080] In actual application, the number of switches 101 can also be greater than 1 (as shown in Figure 2 , at this time, each switch 101 can be linked. That is, when the number of switches 101 is greater than 1, each switch 101 will be affected by the same action of the operating mechanism 105.

[0081] The specific working principle is:

[0082] In actual application, the protection device 10 can be applied to the DC side of a new energy system and connected between a DC power supply and a subsequent conversion circuit; the DC power supply can be a photovoltaic unit such as a photovoltaic module or a photovoltaic string; the DC power supply can also be an energy storage unit such as a battery pack or a battery cluster; here, no limitation is made, which can be determined according to 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 in the DC power supply or the subsequent conversion circuit, such as a reverse connection or a short circuit fault of the DC power supply, or a short circuit fault of the subsequent conversion circuit, the controller can issue a corresponding control signal to control the tripping device 102 to act, so that the switch 101 is tripped, and the protection function of the new energy system is realized.

[0083] Specifically, the faults can be classified according to the influence degree, for example, various faults can be classified into a first type of fault and a second type of fault.

[0084] In the first type of fault, the impact of the fault is small, and if the field staff closes the protection device 10 again after discovering that the protection device 10 is tripped, no serious secondary damage or fire will occur. In practical applications, the first type of fault can be a DC power supply grounding, reverse connection or short circuit fault; at this time, the controller can send a control signal to the tripping device 102 through the switch interface unit 103, so that the tripping device 102 acts, and then the switch 101 is disconnected; in this case, the switch 101 can also be closed by the actuator 104; for example, after the field staff eliminates the grounding and short circuit faults, the protection device 10 can be closed again by the actuator 104, so that the movable contact and the static contact in the switch 101 are closed, realizing the connection between the DC power supply and the subsequent conversion circuit, and the new energy system can resume normal operation.

[0085] In the second type of fault, the impact of the fault is large, such as a fault in the subsequent conversion circuit, such as a DC / DC conversion circuit or a DC / AC conversion circuit, or a fault in the bus capacitor between the positive and negative poles of the DC bus connected by the DC / AC conversion circuit, etc. The field staff cannot directly eliminate the corresponding fault, and needs to replace or repair the equipment belonging to the subsequent conversion circuit, such as the bus box or the power converter. After the field staff discovers that the switch 101 is disconnected, without knowing the specific fault, if the switch 101 is re-closed by manual operation of the actuator 104, the re-closing of the switch 101 will cause secondary damage to the corresponding equipment and lines, even cause a fire, which will endanger property and personal safety. Therefore, in this embodiment, the controller can send another control signal to the tripping device 102 through the switch interface unit 103, so that the tripping device 102 acts; moreover, the tripping action of the tripping device 102 not only disconnects the switch 101, but also maintains the switch 101 in the open state; that is, at this time, the movable contact and the static contact in the switch 101 cannot be closed by the actuator 104, so that the closing operation of the field staff in this case cannot be successful, and the connection between the DC power supply and the subsequent conversion circuit cannot be realized, avoiding secondary damage to the corresponding equipment and lines, even causing a fire.

[0086] The protection device 10 of the new energy system provided in the embodiment can make the tripping device 102 enter the corresponding stable state according to the currently received control signal through the above principle, including the first state in which the switch 101 is disconnected and can be closed by the actuator 104, and the second state in which the switch 101 is disconnected and cannot be closed by the actuator 104; in the second state, the field staff cannot perform the manual operation of closing the switch 101 by the actuator 104, thereby reducing the risk of secondary damage to the equipment and lines and causing a fire.

[0087] Furthermore, in traditional solutions, the controller does not classify faults in the new energy system and can only send one power signal to activate the trip unit. This not only poses a risk of secondary failure or even fire when the switch is manually closed again, but also provides limited protection. In contrast, the protection device 10 for the new energy system provided in this embodiment uses different control signals to bring the trip unit 102 into different stable states. This not only reduces the risk of secondary damage to equipment and wiring and fire, but also allows the new energy system to implement different protection functions under different fault categories. Moreover, this embodiment only requires one trip unit 102 to achieve the above functions, thus avoiding the high cost associated with using two separate trip units.

[0088] Based on the previous embodiment, this embodiment illustrates the specific implementation of the trip unit 102 in the protection device 10. For example, the trip unit 102 can be any trip unit capable of achieving at least two stable states, such as a bidirectional magnetic holding mechanism. The bidirectional magnetic holding mechanism specifically includes a bidirectional magnetic holding coil, which enables it to have at least two stable states, namely, its trip shaft is held on both sides of its own movement direction, which are respectively the first state and the second state in the above embodiment. In practical applications, the trip unit 102 may also have another stable state, namely, its trip shaft is held in the middle position of its own movement direction, which can be simply referred to as the middle holding state.

[0089] For a bidirectional magnetic holding mechanism with an intermediate holding state, it can be configured such that: under a first control signal, the bidirectional magnetic holding mechanism is in a first state, and under a second control signal, the bidirectional magnetic holding mechanism is in a second state; and, under the first control signal and the second control signal, the movement direction of the tripping shaft in the bidirectional magnetic holding mechanism is opposite.

[0090] Specifically, when a minor Class I fault occurs in the new energy system, the controller sends a first control signal. The switch interface unit 103 receives the first control signal and transmits it to the bidirectional magnetic holding mechanism, causing the tripping shaft of the bidirectional magnetic holding mechanism to move towards its A side (e.g., Figure 3 The left side of the structure shown in the lower left corner of the middle section) moves; after the tripping shaft moves to side A and remains there, the bidirectional magnetic holding mechanism is in the first state. In this state, the protection device 10 trips and opens, and can then be closed by the operator 104, causing the moving and stationary contacts inside the switch 101 to close, realizing the connection between the corresponding DC power supply and the subsequent conversion circuit. When a second type of fault with a significant impact occurs in the new energy system, the controller sends a second control signal, the switch interface unit 103 receives the second control signal and transmits it to the bidirectional magnetic holding mechanism, causing the tripping shaft to move to side B of the bidirectional magnetic holding mechanism (e.g., the left side of the structure shown in the lower left corner of the middle section ... Figure 3The right side of the structure shown in the lower left corner) action; after the trip shaft member moves to the B side and remains, the bidirectional magnetic holding mechanism is in the second state, in which case the protection device 10 is tripped open and cannot be closed by the operator 104, that is, the connection between the corresponding DC power supply and the subsequent conversion circuit cannot be achieved.

[0091] Figure 3 The structure of the bidirectional magnetic holding mechanism with the intermediate holding state is exemplarily shown in the middle, in which the upper left corner shows a front view of the bidirectional magnetic holding mechanism, the upper right corner shows a sectional view in the V-V direction of the front view, and the lower left corner shows a sectional view in the U-U direction of the front view.

[0092] As shown in the middle, Figure 3 The bidirectional magnetic holding mechanism includes a magnetic yoke 121, a coil 123, a permanent magnet 122, a moving iron core 124, a stationary iron core 125, and a spring 126; the coil 123 and the permanent magnet 122 are arranged inside the magnetic yoke 121, and the coil 123 is divided into two segments with the same number of turns, and the permanent magnet 122 is located between the two segments of the coil 123, that is, in the middle of the coil 123; in actual application, a permanent magnet 122 with two opposite magnetic poles can be used, Figure 3 The magnetic pole (N pole and S pole) arrangement of the two permanent magnets 122 is exemplarily shown in the upper right corner in the middle; the moving iron core 124 and the stationary iron core 125 are arranged inside the coil 123 and the permanent magnet 122, and the spring 126 is arranged between the moving iron core 124 and the stationary iron core; as shown in the middle, Figure 3 As shown in the middle, the number of stationary iron cores 125 and springs 126 can be 2, at which time one spring 126 is arranged between the moving iron core 124 and each of the two stationary iron cores 125; in addition, the moving iron core 124 is provided with a trip shaft member 127.

[0093] For the structure shown in the middle, Figure 3 When the coil 123 receives a first control signal, it controls the trip shaft member 127 to move in the A tripping direction, so that the trip shaft member 127 remains on the A side, and the bidirectional magnetic holding mechanism, that is, the tripping device 102, is in the first state; when the coil 123 receives a second control signal, it controls the trip shaft member 127 to move in the B tripping direction, so that the trip shaft member 127 remains on the B side, and the bidirectional magnetic holding mechanism is in the second state; wherein the A tripping direction is the direction of movement to the A side, and the B tripping direction is the direction of movement to the B side. In the case where no control signal is received, the trip shaft member 127 is in the middle position between the A side and the B side, and the bidirectional magnetic holding mechanism is in the intermediate holding state; Figure 4 The second state and the intermediate holding state are shown in the middle.

[0094] In addition, in actual applications, the polarities of different control signals can be set to be opposite.

[0095] In one example, the switch interface unit 103 can be composed of a two-wire interface, including a positive interface (e.g., + as shown in Figure 1 Figure 1 and a negative interface (e.g., - as shown in), used to transmit the first control signal and the second control signal. The two-wire interface is in a positive-negative mode, for example, the first control signal is a positive power signal, and the second control signal is a negative power signal, or the first control signal is a negative power signal, and the second control signal is a positive power signal.

[0096] For the structure shown in Figure 3 , there are the following specific states: an initial state, in which the moving iron core 124 is in a centered position between the two static iron cores 125, and is kept in a balanced state under the action of the permanent magnet 122 and the spring 126; at this time, the bidirectional magnetic holding mechanism is in an intermediate holding state. When the first control signal is received, the coil 123 is energized (e.g., with a positive voltage), and the moving iron core 124 with the tripping shaft 127 moves in the A tripping direction to the A side under the action of the A electromagnetic field, and when the moving iron core 124 is attached to the static iron core 125 on one side, it is kept in a balanced state under the action of the permanent magnet 122, at this time, the tripping shaft 127 is kept on the A side in the moving direction of itself, so that the bidirectional magnetic holding mechanism is in a first state; when the second control signal is received, the coil 123 is energized (e.g., with a reverse voltage), and the moving iron core 124 with the tripping shaft 127 moves in the B tripping direction to the B side under the action of the B electromagnetic field, and when the moving iron core 124 is attached to the static iron core 125 on the other side, it is kept in a balanced state under the action of the permanent magnet 122, at this time, the tripping shaft 127 is kept on the B side in the moving direction of itself, so that the bidirectional magnetic holding mechanism is in a second state.

[0097] For the bidirectional magnetic holding mechanism without an intermediate holding state, it can also be set that when the control signal received by the bidirectional magnetic holding mechanism includes a third control signal that arrives first and a fourth control signal that arrives later, the bidirectional magnetic holding mechanism is in a first state; and when the control signal received by the bidirectional magnetic holding mechanism includes only the third control signal, the bidirectional magnetic holding mechanism is in a second state. Moreover, the moving directions of the tripping shaft in the bidirectional magnetic holding mechanism under the third control signal and the fourth control signal are opposite. The third control signal is a signal that causes the switch 101 to be disconnected and cannot be closed by the actuator 104, and the fourth control signal is a signal that causes the bidirectional magnetic holding mechanism to reset to a state in which the switch 101 can be closed by the actuator 104.

[0098] Specifically, when a minor Type I fault occurs in the new energy system, the controller first sends a third control signal. The switch interface unit 103 receives the third control signal and transmits it to the bidirectional magnetic holding mechanism, causing the tripping shaft of the bidirectional magnetic holding mechanism to move towards its B side (e.g., Figure 5 The right side of the structure shown in the lower left corner of the diagram is activated, causing the protection device 10 to trip and open. Then, the controller sends a fourth control signal, which the switch interface unit 103 receives and transmits to the bidirectional magnetic holding mechanism, causing the tripping shaft of the bidirectional magnetic holding mechanism to reset. At this time, the bidirectional magnetic holding mechanism is in the first state, and the protection device 10 can be closed by the operator 104, causing the moving and stationary contacts inside the switch 101 to close, thus realizing the connection between the corresponding DC power supply and the subsequent conversion circuit. When a second type of fault with a significant impact occurs in the new energy system, the controller sends a third control signal, which the switch interface unit 103 receives and transmits to the bidirectional magnetic holding mechanism, causing the tripping shaft to move towards side B of the bidirectional magnetic holding mechanism. After the tripping shaft moves towards side B and remains in place, the bidirectional magnetic holding mechanism is in the second state. In this case, the protection device 10 trips and opens and cannot be closed by the operator 104, meaning that the connection between the corresponding DC power supply and the subsequent conversion circuit cannot be realized.

[0099] Figure 5 The structure of a bidirectional magnetic holding mechanism without an intermediate holding state is illustrated in the figure. The upper left corner shows the front view of the bidirectional magnetic holding mechanism, the upper right corner shows the cross-sectional view in the VV direction of the front view, and the lower left corner shows the cross-sectional view in the UU direction of the front view.

[0100] like Figure 5 As shown, the bidirectional magnetic holding mechanism includes devices and Figure 3 Same as in; with Figure 3 The difference is that Figure 5 The bidirectional magnetic holding mechanism shown does not have a moving iron core 124 in a middle holding state between the two stationary iron cores 125.

[0101] In this structure, when coil 123 receives the third control signal first and then the fourth control signal, it controls the tripping shaft 127 to move to the tripping state in the B tripping direction, and then to the reset state in the reset direction, thereby placing the bidirectional magnetic holding mechanism in the first state; when the bidirectional magnetic holding mechanism only receives the third control signal, it controls the tripping shaft 127 to move in the B tripping direction, placing the bidirectional magnetic holding mechanism in the second state; wherein, the reset direction is towards the A side (e.g., Figure 5The B tripping direction is the direction of movement to the B side. When no control signal is received, the bidirectional magnetic holding mechanism is in the reset state. Figure 6 The first state and the second state are shown in the middle.

[0102] Still taking the opposite direction of the different control signals as an example, for the bidirectional magnetic holding mechanism shown in the left lower corner of the structure, the A tripping direction is the direction of movement to the A side, and the B tripping direction is the direction of movement to the B side. When no control signal is received, the bidirectional magnetic holding mechanism is in the reset state. Figure 5 The structure shown in the middle, specifically includes: the initial state, that is, the reset state of the bidirectional magnetic holding mechanism, at this time the moving iron core 124 is attached to the left static iron core 125. When the third control signal is received, the coil 123 is energized (such as with a reverse voltage), and the moving iron core 124 of the tripping shaft 127 moves to the B side in the B electromagnetic field according to the B tripping direction, and when one side of the moving iron core 124 is attached to the static iron core 125 on that side, it is balanced under the action of the permanent magnet 122. When the bidirectional magnetic holding mechanism is in the B side tripping state, if no fourth control signal is received, it is in the second state; if the fourth control signal is received again, the coil 123 is energized (such as with a positive voltage), and the moving iron core 124 of the tripping shaft 127 moves to the A side in the A electromagnetic field according to the reset direction, and when the other side of the moving iron core 124 is attached to the static iron core 125 on that side, it is balanced under the action of the permanent magnet 122, so that the bidirectional magnetic holding mechanism returns to the reset state, and then is in the first state.

[0103] In addition, for the bidirectional magnetic holding mechanism without an intermediate holding state, the fifth control signal can also be set to make the bidirectional magnetic holding mechanism in the first state, and the sixth control signal can also be set to make the bidirectional magnetic holding mechanism in the second state. The fifth control signal and the sixth control signal are the same direction of movement of the tripping shaft 127 in the bidirectional magnetic holding mechanism. In the first state, the moving distance of the tripping shaft 127 is less than a preset value, so that the bidirectional magnetic holding mechanism can realize automatic reset after the switch 101 is disconnected, and then the switch 101 can be closed by the actuator 104.

[0104] Specifically, when the new energy system has a first type of fault with a small influence degree, the controller sends a fifth control signal, the switch interface unit 103 receives the fifth control signal and transmits it to the bidirectional magnetic holding mechanism, so that the tripping shaft of the bidirectional magnetic holding mechanism moves to the B side thereof by a first distance S1, and the protection device 10 is tripped and opened; then, the tripping shaft of the bidirectional magnetic holding mechanism is automatically reset, the bidirectional magnetic holding mechanism is in a first state, and the protection device 10 can be closed by the actuator 104, so that the moving contact and the stationary contact inside the switch 101 are closed, and the connection between the corresponding DC power supply and the subsequent conversion circuit is realized. When the new energy system has a second type of fault with a large influence degree, the controller sends a sixth control signal, the switch interface unit 103 receives the sixth control signal and transmits it to the bidirectional magnetic holding mechanism, so that the tripping shaft moves to the B side of the bidirectional magnetic holding mechanism by a second distance S2, and the bidirectional magnetic holding mechanism is in a second state. In this case, the protection device 10 is tripped and opened and cannot be closed by the actuator 104, that is, the connection between the corresponding DC power supply and the subsequent conversion circuit cannot be realized.

[0105] In actual application, in the second state, the switch 101 can be closed again by the actuator 104 by resetting the bidirectional magnetic holding mechanism; Figure 4 and Figure 6 The manual reset direction shown in the above is the direction of manually resetting the bidirectional magnetic holding mechanism, and after resetting, the switch 101 can be closed again by the actuator 104.

[0106] In the above various examples, the different signals sent by the controller, such as the first control signal and the second control signal, or the third control signal and the fourth control signal, or the fifth control signal and the sixth control signal, can also be other forms of different signals, as long as the tripping device 102 has at least two stable states, which are within the protection scope of the present application.

[0107] The protection device 10 provided in the embodiment can realize two different protection functions under two types of faults of the new energy system by the double control signals and the bidirectional magnetic holding mechanism, that is, it can ensure that the on-site staff can close the switch and restore the equipment operation when the new energy system has a recoverable fault, and it can also avoid the risk of secondary failure or even fire when the on-site staff closes the switch when the new energy system has a serious fault.

[0108] On the basis of the above-mentioned embodiments, the protection device 10 can further be provided with a reset switch on the tripping device 102; the reset switch has a first position and a second position; when the reset switch is in the first position, the switch 101 can be closed by the actuator 104; when the reset switch is in the second position, the switch 101 cannot be closed by the actuator 104.

[0109] In practical applications, the reset switch can be a push-button switch, a toggle switch or a twist switch, but is not limited thereto, and other switches having two position states are also within the protection scope of the present application.

[0110] When the reset switch is in the first position, the protection device 10 can be closed by the actuator 104. When the reset switch is in the second position, the protection device 10 cannot be closed by the actuator 104. When the tripping device 102 is in the second state, the reset switch is placed in the second position; specifically, when the reset switch is placed in the second position, the connecting rod of the switch 101 can be limited, so that the connecting rod cannot close the movable contact and the stationary contact inside the switch 101, thereby preventing the protection device 10 from being manually closed.

[0111] For the structures shown in Figs. Figure 3 and Figure 4 When the new energy system has the first type of fault, the protection device 10 is tripped, and the tripping shaft 127 is on the A side, at this time, the reset switch is in the first position, and the protection device 10 can be closed by the actuator 104; when the new energy system has the second type of fault, the protection device 10 is tripped, and the tripping shaft 127 is on the B side, at this time, the reset switch is in the second position, and the protection device 10 cannot be closed by the actuator 104.

[0112] For the structures shown in Figs. Figure 5 and Figure 6 When the new energy system has the first type of fault, the protection device 10 is tripped, and the tripping shaft 127 is on the A side, at this time, the reset switch is in the first position, and the protection device 10 can be closed by the actuator 104; when the new energy system has the second type of fault, the protection device 10 is tripped, and the tripping shaft 127 is on the B side, at this time, the reset switch is in the second position, and the protection device 10 cannot be closed by the actuator 104.

[0113] In addition, in practical applications, the device to which the protection device 10 belongs in the new energy system can be provided with a corresponding shell, and the professional technician can open the shell when maintaining the device. The manually operated end of the reset switch can be located inside or outside the shell.

[0114] In an example, the shell can be as shown in Fig. Figure 7As shown, the device includes a housing structure 21 and a cover plate 22. The housing structure 21 has an opening on one side, and the cover plate 22 is detachably mounted on the opening of the housing structure 21. By placing the reset switch inside the housing, after a more severe type II fault has been eliminated, a skilled technician can, with the cover plate 22 open, place the reset switch in the first position to remove the limiting function of the reset switch on the linkage before installing the cover plate 22. At this point, the switch 101 can be closed via the operator 104, and the equipment can resume normal operation.

[0115] In this embodiment, the manual operation terminal of the reset switch is located inside the housing of the corresponding device. This can prevent on-site personnel from directly moving the reset switch from the second position to the first position after the second type of fault tripping action, which would cause the protection device 10 to close and result in secondary damage or fire.

[0116] In another example, the manual operation terminal of the reset switch can also be located outside the housing of the corresponding device. Furthermore, to prevent field personnel from operating the reset switch, a cover can be provided on the outside of the housing for the reset switch; for example, the cover can be located on... Figure 7 The outer casing structure 21 described herein is external, but not limited to it; after a professional technician eliminates the second type of fault, the cover can be opened and the reset switch can be placed in the first position to eliminate the limiting function of the reset switch on the linkage, so that the operator 104 can restore the closing operation function of the switch 101.

[0117] This embodiment does not limit the position of the reset switch; it can be determined according to the actual application environment requirements, and all of these are within the protection scope of this application.

[0118] Based on the above embodiments, this embodiment provides a detailed description of the operator 104 of the protection device 10, such as... Figure 8 As shown, the actuator 104 may specifically include a knob 141 and a connecting rod 142; wherein, the knob 141 is used to accept operations that change the on / off state of the switch 101, such as the manual operation described above; the connecting rod 142 is used to realize the mechanical connection between the knob 141 and the operating mechanism 105.

[0119] like Figure 8 As shown, 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 trip unit 102, and a switch interface unit 103, etc., connected to each other.

[0120] Specifically, the knob 141 is connected to the connecting rod 142 and can be used to drive the connecting rod 142 to rotate. The other end of the connecting rod 142 is connected to the P-stage linkage switch 100 through the operating mechanism 105. By manually operating the knob 141, the P-stage linkage switch 100 can be controlled to be closed or disconnected through the operating mechanism 105. The switch interface unit 103 is used to receive a corresponding control signal to control the trip unit 102 to perform a corresponding tripping action. After receiving the corresponding control signal, the trip unit 102 can control the P-stage linkage switch 100 to be disconnected through the operating mechanism 105.

[0121] The P-stage linkage switch 100 includes P linked switches 101, and P is an integer greater than or equal to 1. Each switch 101 includes a first pin and a second pin. The first pin can be used to connect to the positive or negative pole of the corresponding DC power supply, and the second pin can be used to connect to the corresponding pole of the power supply side of the subsequent conversion circuit. Each switch 101 internally includes a moving contact and a stationary contact. In an example, the switches 101 in the P-stage linkage switch 100 are stacked in a first direction. When the connecting rod 142 rotates, the moving contact and the stationary contact inside each switch 101 are simultaneously closed or disconnected, thereby achieving connection or disconnection between the DC power supply and the subsequent conversion circuit.

[0122] When the new energy system has a first type of fault, Figure 3 and Figure 4 When the protection device 10 is tripped, the trip shaft 127 is on the A side, and Figure 5 and Figure 6 When the protection device 10 is tripped, the trip unit 102 is reset. In both cases, the P-stage linkage switch 100 can be operated by the knob 141 to close the moving contact and the stationary contact inside each switch 101, thereby achieving connection between the DC power supply and the subsequent conversion circuit. When the new energy system has a second type of fault, Figure 3 to Figure 6 When the protection device 10 is tripped, the trip shaft 127 is on the B side, and the moving contact and the stationary contact inside each switch 101 cannot be closed by the knob 141, thereby failing to achieve connection between the DC power supply and the subsequent conversion circuit.

[0123] The protection device 10 can also be selected from other structures, Figure 8 which is only an optional example and is not limited thereto. In addition, a scheme in which each switch is independent but simultaneously receives the same control is also within the scope of the present application.

[0124] In actual application, the protection device 10 can be any isolation device with controllable disconnection function, such as a circuit breaker, a relay, an excitation fuse, etc. The specific category is not limited in the present application, but can be determined according to the specific application environment, which is within the scope of the present application.

[0125] Another embodiment of this application also provides a power transmission device for a new energy system, such as a combiner box or a power converter, etc. Figure 9 As shown, it may specifically include: a main circuit, a control unit 20, and at least one protection device 10 of the new energy system as described in any of the above embodiments; the main circuit is connected to at least one DC power supply through the corresponding protection device 10; the protection device 10 is controlled by the control unit 20.

[0126] 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 limitation here, it depends 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.

[0127] Taking a photovoltaic (PV) unit as an example, photovoltaic power generation is a technology that uses PV modules to convert light energy into electrical energy using the photovoltaic effect. A typical PV system includes PV modules, cables, an inverter, and AC power distribution equipment. In practical applications, to obtain a higher output voltage, multiple PV modules are usually connected in series to form a PV string; to obtain a 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.

[0128] like Figure 10 or Figure 11 As shown, when the power transmission device is a combiner box, its main circuit may only include a busbar to enable the combined connection of the corresponding DC power supply. Alternatively, its main circuit may also include: a busbar and at least one DC / DC converter circuit 30; the input terminal of the DC / DC converter circuit 30 is connected to at least one DC power supply through a corresponding protection device 10, and the output terminal of the DC / DC converter circuit 30 is connected to the busbar, that is, the positive output ports of multiple DC / DC converter circuits 30 are connected in parallel to form the positive output port of the combiner box, and the negative output ports of multiple DC / DC converter circuits 30 are connected in parallel to form the negative output port of the combiner box; the DC / DC converter circuit 30 is controlled by the control unit 20. The output terminal of the combiner box can be connected to the power grid and / or load through an inverter, which includes Figure 10 or Figure 11 The DC / AC converter circuit 40 shown is used. 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 to a bus (such as...) Figure 10The busbar 31 shown is connected in parallel to the output of the combiner box. When the combiner box includes a DC / DC converter circuit 30, MPPT (Maximum Power Point Tracking) can be achieved for the corresponding photovoltaic string, realizing intelligent combiner.

[0129] 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.

[0130] Furthermore, when the number of DC / DC converter circuits 30 is greater than one, each DC / DC converter circuit 30 can share the same protection device 10 (e.g., Figure 10 As shown in the figure, corresponding protection devices 10 can also be used respectively (such as...). Figure 11 As shown in the figure, corresponding protection devices 10 (not shown) can also be used in groups; the number of DC power supplies connected to each DC / DC conversion circuit 30 and the number of switches 101 in the protection device 10 are determined according to the number of DC power supplies connected to each DC / DC conversion 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.

[0131] like Figure 12 As shown, when the power transmission device is a power converter, such as an inverter, its main circuit may include: a DC / AC conversion circuit 40; the DC side of the DC / AC conversion circuit 40 is connected to at least one DC power source through a corresponding protection device 10; the AC side of the DC / AC conversion circuit 40 serves as the AC side of the main circuit; the DC / AC conversion circuit 40 is controlled by a control unit 20. Alternatively, the main circuit may also include: a DC / AC conversion circuit 40 and at least one DC / DC conversion circuit 30; the input terminal of the DC / DC conversion circuit 30 is connected to at least one DC power source through a corresponding protection device 10, the output terminal of the DC / DC conversion circuit 30 is connected to the DC side of the DC / AC conversion circuit 40, and the AC side of the DC / AC conversion circuit 40 serves as the AC side of the main circuit; the DC / DC conversion circuit 30 and the DC / AC conversion circuit 40 are respectively controlled by the control unit 20. 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.

[0132] Similarly, when the number of DC / DC conversion circuits 30 is greater than 1, each DC / DC conversion circuit 30 can share the same protection device 10 (as shown in Figure 12 ), can respectively adopt a corresponding protection device 10 (not shown), or can be grouped to adopt a corresponding protection device 10 (not shown); the number of DC / DC conversion circuits 30 and the number of switches 101 in the protection device 10 can be determined, which is not limited here and is within the protection scope of the present application. Moreover, when the number of DC / DC conversion circuits 30 is greater than 1, the output ends of each DC / DC conversion circuit 30 can be connected in parallel to the DC side of the DC / AC conversion circuit 40 through a DC bus.

[0133] When the new energy system fails, the control unit 20 controls the protection device 10 to perform corresponding actions according to the fault type, and the process of implementing fault protection can be referred to Figure 13 to Figure 15 for example in the above embodiments, which will not be repeated here.

[0134] In the traditional technical solution, after the protection device 10 is opened by the field staff, the protection device 10 is re-closed by operating the operating device of the protection device 10. If the new energy system has a serious fault at this time, such as the failure of the internal conversion circuit of the inverter or the bus short circuit, it will cause secondary damage or even fire, which will endanger property and personal safety. The power transmission equipment provided in the embodiment can realize the busbar or power converter, so that the new energy system can realize two different protection functions under two fault categories, thereby avoiding the field staff from closing the switch 101 through the operating device 104 after the protection device 10 is opened, and reducing the risk of secondary damage to the equipment and lines and causing a fire.

[0135] On the basis of the above embodiment, the control unit 20 in the power transmission equipment can include a controller 201, a collection module 202, and a driving circuit 203, as shown in Figure 16 , which is taken as an example on the basis of Figure 1 .

[0136] The controller 201 obtains voltage information and / or current information at at least one position in the power transmission equipment through the collection module 202. When the power transmission equipment is a busbar, the information collected by the collection module 202 can be the corresponding information at the input end or the output end of the DC / DC conversion circuit 30; when the power transmission equipment is a power converter, the information collected by the collection module 202 can be the corresponding information at at least one side of the DC / AC conversion circuit 40 and / or at least one side of the DC / DC conversion circuit 30.

[0137] The output end of the acquisition module 202 is connected with the input end of the controller 201, so that the controller 201 acquires corresponding information through the acquisition module 202, and then judges whether the new energy system has the first type of fault or the second type of fault. For the case that the direct current power supply is a photovoltaic unit, when the power transmission device is a busbar box, the information acquired by the acquisition module 202 includes but is not limited to one or more of 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, and the voltage of the bus capacitor; when the power transmission device is a power converter, the information acquired by the acquisition module 202 includes but is not limited to one or more of 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 alternating current output end current of the DC / AC conversion circuit 40, and the internal temperature of the power converter; it can be determined according to the specific application environment, which is within the protection scope of the present application.

[0138] The output end of the controller 201 is connected with the input end of the drive circuit 203, and the output end of the drive circuit 203 is connected with the switch interface unit 103 of the protection device 10. That is, the controller 201 outputs a control signal for the protection device 10 through the drive circuit 203, and then controls the on-off state of the protection device 10; when the main circuit includes a conversion circuit, the controller 201 can also control the running state of the main circuit.

[0139] In actual application, one or more drive modules can be included in the drive circuit 203, and one drive module can drive one controlled device or multiple controlled devices with the same opening and closing. For the DC / DC conversion circuit 30, the controlled device refers to the power switch tube inside it; for the protection device 10, the controlled device refers to the switch 101 inside it. Controllable switching devices such as triodes, MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), IGBTs (Insulated Gate Bipolar Transistors), and relays can be included in the drive module; this is not limited here, and it can be determined according to the specific application environment, which is within the protection scope of the present application.

[0140] In an example, when the controller 201 outputs one type of control signal, the output function of another type of control signal is in a limited state, so that the tripper 102 in the protection device 10 cannot perform the corresponding tripping action.

[0141] Specifically, the controller 201 is in a limited state for outputting the control signal for making the protection device 10 enter the second state when outputting the control signal for making the protection device 10 enter the first state. And the controller 201 is also in a limited state for outputting the control signal for making the protection device 10 enter the first state when outputting the control signal for making the protection device 10 enter the second state.

[0142] For example, for the structure shown in Figure 3 or Figure 4 When the controller 201 issues the first control signal to make the tripping device 102 act to the A side, the controller 201 cannot issue the second control signal; when the controller 201 issues the second control signal to make the tripping device 102 act to the B side, the controller 201 cannot issue the first control signal. For the structure shown in Figure 3 or Figure 4 When the controller 201 issues the fourth control signal to reset the tripping device 102, the controller 201 cannot issue the third control signal; when the controller 201 issues the third control signal to make the tripping device 102 act to the B side, the controller 201 cannot issue the fourth control signal.

[0143] In addition, the control unit 20 can also include Figure 13 a switching power supply 204, the output end of the switching power supply 204 is connected with the power supply end of the drive circuit 203, for providing corresponding electric energy for the drive circuit 203. The input end of the switching power supply 204 is not limited, that is, the power source of the switching power supply 204 is not limited, which can be a direct current power supply, can be a direct current bus connected to the direct current side of the inverter, and can be an alternating current side of the inverter; it is determined according to the specific application environment, which is within the protection scope of the present application.

[0144] It is worth mentioning that the naming of the input end and the output end of each conversion circuit in the present application is only for distinguishing the two sides, and is not a limitation on the direction of electric energy transmission. For example, when the direct current power supply is an energy storage unit, its discharging process will make the electric energy be transmitted to the power grid and / or the load in turn through the corresponding DC / DC conversion circuit 30 and the DC / AC conversion circuit 40, or be transmitted to the direct current load through the corresponding DC / DC conversion circuit 30 after being transmitted to the direct current bus. And its charging process will make the electric energy be charged by the power grid in reverse through the DC / AC conversion circuit 40 and the corresponding DC / DC conversion circuit 30, or be charged by other power sources through the direct current bus in reverse through the corresponding DC / DC conversion circuit 30.

[0145] As described in the above embodiments, the power transmission device can also include a housing, and the housing can adopt Figure 7The structure shown, that is, including the shell structure 21 and the cover plate 22; the main circuit and control unit 20 is arranged inside the shell structure 21, most of the devices of the protection device 10 such as the tripping device 102 and the P cascade operating switch 100 are also arranged inside the shell structure 21; at the same time, in order to ensure that the operating mechanism 104 of the protection device 10 can accept manual operation, a through hole can be arranged on the shell structure 21 for the connecting rod 142 of the operating mechanism 104 in each protection device 10 to pass through, so that the knob 141 of the operating mechanism 104 in the protection device 10 can be located outside the shell. In addition, the connection between the cover plate 22 and the shell structure 21 can be provided with a sealing strip or sealing glue to form a closed environment inside the shell structure 21.

[0146] In practical application, the shell of the power transmission device can also adopt other implementation forms, and is not limited to Figure 7 The structure shown, as long as the protection function of the internal devices can be realized and the operating mechanism 104 of the protection device 10 can accept manual operation, it is within the protection scope of the present application.

[0147] In addition, the reset switch in the protection device 10 can also be arranged inside the shell, which can avoid that the protection device 10 is broken, the on-site staff directly moves the reset switch from the second position to the first position, and the protection device 10 is closed again. Damage or fire.

[0148] Furthermore, the present embodiment can utilize the existing control unit and tripping switch in the power transmission device, without increasing additional devices, and without significantly increasing the cost of the system.

[0149] The same and similar parts among the various embodiments in the present specification can be referred to each other, and each embodiment mainly describes the difference from other embodiments. Especially, for the system or system embodiment, since it is basically similar to the method embodiment, it is described more simply, and the related part can be referred to the part of the method embodiment. The system and system embodiment described above are only schematic, and the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, that is, they can be located in one place, or can be distributed to multiple network units. According to the actual needs, part or all of the modules can be selected to achieve the purpose of the present embodiment. Those skilled in the art can understand and implement without creative labor.

[0150] Having described above several embodiments of the disclosure, features of the various embodiments described in this specification can be combined with each other, or substituted for each other or in various embodiments, without departing from the spirit or essential characteristics of the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without the use of the innovative faculty presented in this specification. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed in this specification.

Claims

1. A protection device for a new energy system, characterized in that, include: The circuit includes a trip unit, a switch interface unit, an operating mechanism, an actuator, and at least one switch; wherein, One end of the actuator acts on the operating mechanism, enabling the operating mechanism to change the on / off state of the switch; the other end of the actuator is used to receive the operation of changing the on / off state of the switch. The input terminal of the trip unit receives a control signal through the switch interface unit; the control signal is sent by the controller of the protection device in the equipment belonging to the new energy system. The output of the trip unit acts on the operating mechanism, enabling the operating mechanism to switch from the closed state to the tripped open state; and the trip unit corresponds one-to-one with the operating mechanism. The trip unit is in different stable states under different control signals; one of the stable states is a first state in which the switch is open and can be closed by the operator, and another stable state is a second state in which the switch is open and cannot be closed by the operator.

2. The protection device for a new energy system according to claim 1, characterized in that, The trip unit includes a bidirectional magnetic holding mechanism.

3. The protection device for a new energy system according to claim 2, characterized in that, When the control signal is the first control signal, the bidirectional magnetic holding mechanism is in the first state; When the control signal is the second control signal, the bidirectional magnetic holding mechanism is in the second state; Under the first control signal and the second control signal, the movement direction of the release shaft in the bidirectional magnetic holding mechanism is opposite; In the absence of the control signal, the bidirectional magnetic holding mechanism is in the intermediate holding state where the release shaft is centered.

4. The protection device for a new energy system according to claim 2, characterized in that, When the control signal includes a third control signal that arrives first and a fourth control signal that arrives later, the bidirectional magnetic holding mechanism is in the first state; When the control signal is the third control signal, the bidirectional magnetic holding mechanism is in the second state; Under the third and fourth control signals, the movement directions of the tripping shaft in the bidirectional magnetic holding mechanism are opposite; the third control signal is a signal that causes the switch to be disconnected and cannot be closed by the operator, and the fourth control signal is a signal that causes the bidirectional magnetic holding mechanism to be reset so that the switch can be closed by the operator.

5. The protection device for a new energy system according to claim 2, characterized in that, When the control signal is the fifth control signal, the bidirectional magnetic holding mechanism is in the first state; When the control signal is the sixth control signal, the bidirectional magnetic holding mechanism is in the second state; Under the fifth and sixth control signals, the movement direction of the tripping shaft in the bidirectional magnetic holding mechanism is the same; under the fifth control signal, the movement distance of the tripping shaft is less than a preset value, so that after the switch is disconnected, the bidirectional magnetic holding mechanism automatically resets to the state where the switch can be closed by the operator.

6. The protection device for a new energy system according to any one of claims 1 to 5, characterized in that, The trip unit is equipped with a reset switch; the state of the reset switch includes a first position and a second position. When the reset switch is in the first position, the switch can be closed by the actuator. When the reset switch is in the second position, the switch cannot be closed by the actuator.

7. The protection device for a new energy system according to claim 6, characterized in that, The manual operation terminal of the reset switch is located inside the housing of the protective device belonging to the new energy system.

8. The protection device for a new energy system according to any one of claims 2 to 5, characterized in that, The bidirectional magnetic holding mechanism includes: a magnetic yoke, a coil, a permanent magnet, a moving iron core, a stationary iron core, and a spring; The coil and the permanent magnet are disposed inside the magnetic yoke, with the permanent magnet located in the middle of the coil; The moving iron core and the stationary iron core are disposed inside the coil and the permanent magnet; The spring is provided between the moving iron core and the stationary iron core; The moving iron core is equipped with a release shaft.

9. The protection device for a new energy system according to any one of claims 1 to 5, characterized in that, The control signal is a voltage signal or a current signal.

10. The protection device for a new energy system according to any one of claims 1 to 5, characterized in that, The polarity of the different control signals is opposite.

11. 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.

12. The protection device for a new energy system according to any one of claims 1 to 5, characterized in that, The actuator includes: a knob and a connecting rod; The knob is used to accept operations that change the on / off state of the switch; The connecting rod enables the mechanical connection between the knob and the operating mechanism.

13. A power transmission device for a new energy system, characterized in that, include: The main circuit, the control unit, and at least one protection device for the new energy system as described in any one of claims 1 to 12; The main circuit is connected to at least one DC power supply through the corresponding protection device. The protection device is controlled by the control unit.

14. The power transmission device for a new energy system according to claim 13, characterized in that, The control unit includes: a controller, a data acquisition module, and a drive circuit; The acquisition module is used to acquire voltage and / or current information at at least one location in the power transmission device; The output terminal of the acquisition module is connected to the input terminal of the controller; The output terminal of the controller is connected to the input terminal of the drive circuit; The output terminal of the drive circuit is connected to the switch interface unit of the protection device.

15. The power transmission device for a new energy system according to claim 14, characterized in that, When the controller outputs one control signal, its output function for another control signal is restricted.

16. The power transmission device for a new energy system according to claim 14, 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.

17. The power transmission device for a new energy system according to claim 13, characterized in that, Also includes: case; The connecting rod of the actuator in the protective device passes through the through hole of the housing; The knob of the actuator is located on the outside of the housing.

18. The power transmission device for a new energy system according to any one of claims 13 to 17, characterized in that, The main circuit includes: a bus; Alternatively, the main circuit includes: a bus and at least one DC / DC converter circuit; the input terminal of the DC / DC converter circuit is connected to at least one DC power supply through a corresponding protection device, and the output terminal of the DC / DC converter circuit is connected to the bus; the DC / DC converter circuit is controlled by the control unit.

19. The power transmission device for a new energy system according to any one of claims 13 to 17, characterized in that, The main circuit includes: a DC / AC conversion circuit; the DC side of the DC / AC conversion circuit is connected to at least one DC power supply through a corresponding protection device; the AC side of the DC / AC conversion circuit serves as the AC side of the main circuit; the DC / AC conversion circuit is controlled by the control unit. Alternatively, the main circuit includes: a DC / AC conversion circuit and at least one DC / DC conversion circuit; the input terminal of the DC / DC conversion circuit is connected to at least one DC power supply through the corresponding protection device, the output terminal of the DC / DC conversion circuit is connected to the DC side of the DC / AC conversion circuit, and the AC side of the DC / AC conversion circuit serves as the AC side of the main circuit; the DC / DC conversion circuit and the DC / AC conversion circuit are respectively controlled by the control unit.

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