Heat dissipation assembly protection circuit of converter, heat dissipation device and converter system

Abstract

The utility model provides a heat dissipation assembly protection circuit of a converter, a heat dissipation device and a converter system, and the heat dissipation assembly protection circuit comprises a first on-off controller and a signal processor. The output end of the converter is connected with the first transformer; wherein the first on-off controller is arranged between the heat dissipation assembly and the first transformer; the first on-off controller is connected with the signal processor; the signal processor collects the voltage of the designated side of the first transformer, and when the voltage of the designated side meets the preset voltage imbalance condition, the signal processor controls the first on-off controller to be switched off, and the heat dissipation assembly stops running. In the mode, the on-off controller is arranged between the heat dissipation assembly and the first transformer, when the signal processor detects that the power supply voltage of the heat dissipation assembly is unbalanced, the on-off controller is controlled to be switched off, the situation that the heat dissipation assembly continues to operate under the condition that the power supply voltage is unbalanced is avoided, the heat dissipation assembly is protected, the heat dissipation assembly is prevented from losing efficacy, and the service life of the heat dissipation assembly is prolonged. And the service life of the radiating assembly is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power, in particular to a heat dissipation assembly protection circuit of a converter, a heat dissipation device and a converter system. BACKGROUND

[0002] The heat dissipation assembly is arranged in the converter, and when the power supply voltage of the heat dissipation assembly is unbalanced, the heat dissipation assembly is prone to failure phenomena such as slow rotation and stop of rotation, which leads to damage of the heat dissipation assembly and affects the service life of the heat dissipation assembly. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the purpose of the present application is to provide a heat dissipation assembly protection circuit of a converter, a heat dissipation device and a converter system, which can protect the heat dissipation assembly when the power supply voltage of the heat dissipation assembly is unbalanced, avoid failure of the heat dissipation assembly and improve the service life of the heat dissipation assembly.

[0004] In a first aspect, the embodiments of the present application provide a heat dissipation assembly protection circuit of a converter, which comprises a first on-off controller and a signal processor; an output end of the converter is connected to a first transformer; wherein the first on-off controller is arranged between the heat dissipation assembly and the first transformer; the first on-off controller is connected to the signal processor; the signal processor collects a specified side voltage of the first transformer; when the specified side voltage meets a preset voltage imbalance condition, the signal processor controls the first on-off controller to be disconnected, and the heat dissipation assembly stops running.

[0005] The signal processor is connected between the converter and the first transformer, and the signal processor collects a primary side voltage of the first transformer; and / or the signal processor is connected between the heat dissipation assembly and the first transformer, and the signal processor collects a secondary side voltage of the first transformer.

[0006] The heat dissipation assembly protection circuit further comprises a second on-off controller; the first on-off controller comprises a control coil and an on-off contact which are connected to each other; the on-off contact is arranged between the heat dissipation assembly and the first transformer; the second on-off controller is arranged between the control coil and the first transformer; the second on-off controller is further connected to the signal processor; when the specified side voltage of the first transformer meets the preset voltage imbalance condition, the signal processor controls the second on-off controller to be disconnected, the first transformer stops supplying power to the control coil, and the control coil controls the on-off contact to be disconnected.

[0007] The first on-off controller further comprises an auxiliary contact; the auxiliary contact is connected between a specified power supply and the signal processor; when the auxiliary contact is closed, the specified power supply provides a voltage signal of the specified power supply to the signal processor; when the specified side voltage meets the preset voltage imbalance condition, the signal processor controls the auxiliary contact to be disconnected, so as to stop providing the voltage signal of the specified power supply to the signal processor.

[0008] The aforementioned heat dissipation component protection circuit also includes a control board, and multiple first on / off controllers are included. The control board is connected to a signal processor, and the control board is also connected to multiple first on / off controllers respectively. Multiple first on / off controllers are connected in series between the heat dissipation component and the first transformer. When the voltage on a specified side of the first transformer meets the preset voltage imbalance condition, the signal processor sends a control signal to the control board so as to control each first on / off controller to disconnect through the control board.

[0009] The aforementioned heat dissipation component protection circuit also includes multiple second on / off controllers; each second on / off controller corresponds one-to-one with a first on / off controller; each first on / off controller includes: interconnected control coils and on / off contacts; the on / off contacts of multiple first on / off controllers are connected in series between the heat dissipation component and the first transformer; each second on / off controller is located between the control coil and the first transformer in its corresponding first on / off controller; the second on / off controller is connected to a control board; when the voltage on a specified side of the first transformer meets a preset voltage imbalance condition, the signal processor sends a control signal to the control board, so that the control board controls the second on / off controller to disconnect, thereby stopping the first transformer from supplying power to the control coil, and the control coil controls the on / off contacts to disconnect.

[0010] The aforementioned heat dissipation component protection circuit also includes multiple second on / off controllers; each second on / off controller corresponds one-to-one with a first on / off controller; each first on / off controller includes interconnected control coils and on / off contacts; the on / off contacts of multiple first on / off controllers are connected in series between the heat dissipation component and the first transformer; each second on / off controller is located between the control coil and the first transformer in its corresponding first on / off controller; among the multiple second on / off controllers, the second on / off controllers in the first group are connected to a signal processor, and the second on / off controllers in the second group are connected to a control board; when the voltage on the designated side of the first transformer meets a preset voltage imbalance condition, the signal processor controls the second on / off controllers in the first group to disconnect, so that the first transformer stops supplying power to the control coil, and the control coil controls the on / off contacts to disconnect; when the voltage on the designated side of the first transformer meets a preset voltage imbalance condition, the signal processor also sends a control signal to the control board, so that the control board controls the second on / off controllers in the second group to disconnect, so that the first transformer stops supplying power to the control coil, and the control coil controls the on / off contacts to disconnect.

[0011] The auxiliary contacts of the first on / off controller corresponding to the second part group mentioned above are connected to the signal processor or control board.

[0012] Secondly, embodiments of this application provide a heat dissipation device, which includes a heat dissipation component and a protection circuit for the heat dissipation component.

[0013] Thirdly, embodiments of this application provide a converter system, which includes: a converter, a first transformer, and the aforementioned heat dissipation device; the primary side of the first transformer is connected to the grid side of the converter.

[0014] The signal processor of the heat dissipation component protection circuit in the aforementioned converter connection heat dissipation device is also used to: send a shutdown signal to the converter when the voltage on the designated side of the first transformer meets the preset voltage imbalance condition, so as to control the converter to shut down.

[0015] A third on / off controller is provided between the grid side of the aforementioned converter and the primary side of the first transformer.

[0016] The aforementioned converter heat dissipation component protection circuit, heat dissipation device, and converter system, wherein the heat dissipation component protection circuit includes a first on / off controller and a signal processor; the output terminal of the converter is connected to a first transformer; wherein the first on / off controller is disposed between the heat dissipation component and the first transformer; the first on / off controller is connected to the signal processor; the signal processor acquires the specified side voltage of the first transformer, and when the specified side voltage meets the preset voltage imbalance condition, the signal processor controls the first on / off controller to disconnect, and the heat dissipation component stops operating.

[0017] In this method, an on / off controller is set between the heat dissipation component and the first transformer. When the signal processor detects an imbalance in the power supply voltage of the heat dissipation component, it controls the on / off controller to disconnect, thereby preventing the heat dissipation component from continuing to operate under unbalanced power supply voltage, protecting the heat dissipation component, preventing its failure, and improving its lifespan.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a heat dissipation component protection circuit for a first type of converter provided in an embodiment of this application;

[0021] Figure 2 (a) is a schematic diagram of the heat dissipation component protection circuit of the second type of converter provided in the embodiment of this application;

[0022] Figure 2(b) is a schematic diagram of the heat dissipation component protection circuit of the third type of converter provided in the embodiments of this application;

[0023] Figure 2 (c) is a schematic diagram of the heat dissipation component protection circuit of the fourth type of converter provided in the embodiments of this application;

[0024] Figure 3 A schematic diagram of the topology of a heat dissipation component protection circuit for a first type of converter provided in an embodiment of this application;

[0025] Figure 4 A schematic diagram of the topology of a heat dissipation component protection circuit for a second type of converter provided in an embodiment of this application;

[0026] Figure 5 (a) is a topology diagram of the heat dissipation component protection circuit of the third type of converter provided in the embodiment of this application;

[0027] Figure 5 (b) is a topology diagram of the heat dissipation component protection circuit of the fourth type of converter provided in the embodiments of this application;

[0028] Figure 6 A schematic diagram of the topology of the heat dissipation component protection circuit of the fifth type of converter provided in the embodiments of this application;

[0029] Figure 7 A schematic diagram of a heat dissipation device provided in an embodiment of this application;

[0030] Figure 8 This is a schematic diagram of a converter system provided in an embodiment of this application. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. 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.

[0032] In power generation systems, heat dissipation components are mainly used to cool equipment. Taking converters as an example, the power grid may experience high voltage ride-through or low voltage ride-through phenomena, which can lead to an imbalance in the supply voltage. As a result, the heat dissipation components of the converter may fail. The lateral force on the bearings of the heat dissipation components increases, and the winding current also increases, making the heat dissipation components more prone to damage and resulting in a shorter lifespan.

[0033] Based on this, the heat dissipation component protection circuit, heat dissipation device and converter system provided in the embodiments of this application can be applied to heat dissipation components in various scenarios, such as cooling fans.

[0034] To facilitate understanding of this embodiment, a detailed description of a converter heat dissipation component protection circuit disclosed in this application embodiment will be provided first, such as... Figure 1 As shown, the heat dissipation component protection circuit includes: a first on / off controller 10 and a signal processor 12. The output terminal of the converter is connected to the first transformer.

[0035] The first on / off controller is located between the heat dissipation component and the first transformer. The first on / off controller is connected to a signal processor. The signal processor collects the voltage on a specified side of the first transformer. When the voltage on the specified side of the first transformer meets the preset voltage imbalance condition, the signal processor controls the first on / off controller to disconnect, and the heat dissipation component stops operating.

[0036] The first on / off controller can be a contactor or other device with switching function. The first on / off controller is used to control the connection and disconnection between the heat dissipation component and the first transformer. When the first on / off controller is connected, the heat dissipation component is connected to the first transformer, and the heat dissipation component operates after being powered by the first transformer. When the first on / off controller is disconnected, the heat dissipation component is disconnected from the first transformer, the heat dissipation component is de-energized, and stops operating.

[0037] The output voltage of the first transformer is usually set according to the requirements of the heat dissipation components. For example, the first transformer outputs 400V AC power to power the heat dissipation components.

[0038] The signal processor can be a DSP (Digital Signal Processor) chip, or a microcontroller, ARM (Advanced RISC Machines), or other chips used for signal processing. The signal processor is used to acquire the specified side voltage of the first transformer. This specified side voltage can be the primary side voltage of the first transformer, the secondary side voltage of the first transformer, or both the primary and secondary side voltages simultaneously.

[0039] The signal processor can be connected to the first transformer, for example, by connecting to the primary side of the first transformer to collect the primary voltage of the first transformer in real time; or by connecting to the secondary side of the first transformer to collect the secondary voltage of the first transformer in real time.

[0040] The signal processor can also store the aforementioned voltage imbalance conditions. When the signal processor acquires the voltage on a specified side of the first transformer, it determines whether the specified side voltage meets the voltage imbalance conditions. If it does, it indicates that a supply voltage imbalance has occurred on the specified side of the first transformer. The signal processor then sends a control signal to the first on / off controller, controlling the first on / off controller to disconnect. After the first on / off controller disconnects, the heat dissipation component is de-energized and stops operating, thereby preventing the heat dissipation component from continuing to operate under power imbalance conditions.

[0041] When the voltage on the designated side of the first transformer does not meet the above-mentioned voltage imbalance condition, it indicates that the power supply voltage is balanced, the first on / off controller is kept connected, and the heat dissipation components operate normally.

[0042] The aforementioned converter's heat dissipation component protection circuit includes: a first on / off controller and a signal processor; the converter's output terminal is connected to a first transformer; wherein, the first on / off controller is located between the heat dissipation component and the first transformer; the first on / off controller is connected to the signal processor; the signal processor acquires the specified side voltage of the first transformer, and when the specified side voltage meets the preset voltage imbalance condition, the signal processor controls the first on / off controller to disconnect, and the heat dissipation component stops operating.

[0043] In this method, an on / off controller is set between the heat dissipation component and the first transformer. When the signal processor detects an imbalance in the power supply voltage of the heat dissipation component, it controls the on / off controller to disconnect, thereby preventing the heat dissipation component from continuing to operate under unbalanced power supply voltage, protecting the heat dissipation component, preventing its failure, and improving its lifespan.

[0044] In one specific implementation, a signal processor is connected between the converter and the first transformer, and the signal processor acquires the primary voltage of the first transformer; and / or, a signal processor is connected between the heat dissipation assembly and the first transformer, and the signal processor acquires the secondary voltage of the first transformer.

[0045] The signal processor can acquire the primary voltage of the first transformer, the secondary voltage of the first transformer, or both voltages simultaneously. The connection relationships for signal processing change accordingly depending on the acquired voltage.

[0046] exist Figure 2 In example (a), the signal processor is connected between the first transformer and the heat dissipation component, meaning that the signal processor collects the secondary voltage of the first transformer.

[0047] exist Figure 2 In example (b), the signal processor is connected between the first transformer and the converter, meaning that the signal processor collects the primary voltage of the first transformer.

[0048] exist Figure 2 In example (c), the signal processor is connected both between the first transformer and the converter, and between the first transformer and the heat dissipation assembly. The signal processor simultaneously acquires the primary and secondary voltages of the first transformer.

[0049] Further reference Figure 2 The heat dissipation component protection circuit also includes: a second on / off controller 20, wherein the first on / off controller includes: a control coil 101 and an on / off contact 102 connected to each other; the on / off contact is disposed between the heat dissipation component and the first transformer;

[0050] The second on / off controller is located between the control coil and the first transformer; the second on / off controller is also connected to a signal processor; when the voltage on the designated side of the first transformer meets the preset voltage imbalance condition, the signal processor controls the second on / off controller to open, the first transformer stops supplying power to the control coil, and the control coil controls the on / off contacts to open.

[0051] The second on / off controller can be a relay or other device with switching function; the second on / off controller is used to control the connection and disconnection between the control coil and the first transformer; when the second on / off controller is connected, the control coil is connected to the first transformer, the control coil receives power from the first transformer, and then the on / off contacts are closed, and the heat dissipation assembly operates normally under the power supply of the first transformer; when the second on / off controller is disconnected, the control coil is disconnected from the first transformer, the control coil is de-energized, and then the first on / off controller is disconnected, and the heat dissipation assembly stops operating.

[0052] The second on / off controller is connected to the signal processor. The signal processor sends control signals to the second on / off controller, which can directly control the on / off state of the second on / off controller. In actual implementation, the first transformer can be a three-phase transformer with a total output voltage of 400V. Connecting one phase to the second on / off controller can output 220V AC power to the second on / off controller.

[0053] See Figure 3 The diagram shows a topology diagram of a heat dissipation component protection circuit.

[0054] The signal processor is connected to the primary side of the first transformer, and the first on / off controller is connected to the secondary side of the first transformer. The signal processor can collect the primary side voltage of the first transformer, and when the primary side voltage meets the preset voltage imbalance condition, it controls the first on / off controller to disconnect.

[0055] exist Figure 3In the example, the primary side of the first transformer is connected to the grid side of the converter. The first transformer converts the electrical energy output from the converter into 400V AC power, which then powers the heat dissipation components. The signal processor is connected between the converter grid side and the first transformer to acquire the primary voltage of the first transformer.

[0056] Furthermore, the aforementioned first on / off controller also includes an auxiliary contact; the auxiliary contact is connected between the designated power supply and the signal processor; when the auxiliary contact is closed, the designated power supply provides a voltage signal to the signal processor; when the voltage on the designated side meets a preset voltage imbalance condition, the signal processor controls the auxiliary contact to open, thereby stopping the supply of the designated power supply voltage signal to the signal processor. Since the control coil simultaneously controls the on / off contact and the auxiliary contact, when the on / off contact is closed, the auxiliary contact is also closed, and when the on / off contact is open, the auxiliary contact is also open. When the auxiliary contact is open, the signal processor cannot receive the voltage signal from the designated power supply; at this time, the signal processor determines that the heat dissipation component has stopped supplying power.

[0057] The specified power supply here can specifically be the switching power supply in the converter.

[0058] refer to Figure 3 A three-phase line connects the first transformer to the heat dissipation assembly, with one on / off contact for each phase to control the on / off state of that phase. An auxiliary contact is located between the designated power supply and the signal processor, which can output 24V DC.

[0059] The on / off contact and auxiliary contact are synchronized. When the on / off contact is closed, the auxiliary contact is also closed; when the on / off contact is open, the auxiliary contact is also open. The function of the auxiliary contact is to provide feedback to the signal processor on / off status of the first on / off controller. Specifically, when the on / off contact is closed, the auxiliary contact is also closed, and the signal processor can receive the voltage signal of the specified power supply, such as a 24V signal. When the on / off contact is open, the auxiliary contact is also open, and the signal processor cannot receive the voltage signal of the specified power supply; for example, it may receive a zero-level signal.

[0060] See Figure 4 The diagram shows another topology of a heat dissipation component protection circuit. The heat dissipation component protection circuit also includes a control board, which can be used to control multiple first on / off controllers. Typically, signal processors have a limited number of ports; if multiple first on / off controllers need to be controlled, a control board is required, with multiple output ports, each controlling one first on / off controller. Figure 4 Taking a first on / off controller as an example, the control board is connected to a second on / off controller.

[0061] This method provides multiple protections for the heat dissipation components. When one of the first on / off controllers fails to disconnect, disconnecting the other first on / off controllers can usually control the heat dissipation components to cut off power, thus protecting them.

[0062] When there are multiple first on / off controllers, the control board is connected to the signal processor, and the control board is also connected to multiple first on / off controllers respectively; multiple first on / off controllers are connected in series between the first transformer and the heat dissipation component; when the voltage on the designated side of the first transformer meets the preset voltage imbalance condition, the signal processor sends a control signal to the control board so that the control board can control each first on / off controller to disconnect.

[0063] The signal processor sends control signals to the control board, which simultaneously controls each first on / off controller to disconnect. If one of the first on / off controllers fails to disconnect, disconnecting the other first on / off controllers can still protect the heat dissipation components.

[0064] refer to Figure 5 As shown in (a), multiple first on / off controllers are controlled by the same second on / off controller; the multiple first on / off controllers are connected in series. Each first on / off controller includes: an interconnected control coil and on / off contacts; the on / off contacts of the multiple first on / off controllers are connected in series between the heat dissipation assembly and the first transformer.

[0065] refer to Figure 5 As shown in (b), the heat dissipation component protection circuit also includes multiple second on / off controllers; each second on / off controller corresponds to a first on / off controller, i.e., one second on / off controller is connected to one first on / off controller; the first on / off controller includes: a control coil and on / off contacts that are connected to each other; the on / off contacts of multiple first on / off controllers are connected in series between the heat dissipation component and the first transformer.

[0066] Each second on / off controller is located between the control coil and the first transformer in the corresponding first on / off controller; the second on / off controller is connected to the control board; when the voltage on the designated side of the first transformer meets the preset voltage imbalance condition, the signal processor sends a control signal to the control board to control the second on / off controller to disconnect, so that the first transformer stops supplying power to the control coil, and the control coil controls the on / off contacts to open.

[0067] Figure 5 (b) in the example uses two second on / off controllers. The on / off contacts of the two first on / off controllers are connected in series between the first transformer and the heat dissipation assembly. Each first on / off controller corresponds to one second on / off controller. The control board can control the on / off state of the two second on / off controllers.

[0068] Figure 6In another embodiment, the heat dissipation component protection circuit further includes multiple second on / off controllers; each second on / off controller corresponds one-to-one with a first on / off controller; each first on / off controller includes: interconnected control coils and on / off contacts; the on / off contacts of multiple first on / off controllers are connected in series between the heat dissipation component and the first transformer;

[0069] Each second on / off controller is located between the control coil and the first transformer in the corresponding first on / off controller; among the multiple second on / off controllers, the second on / off controllers in the first group are connected to the signal processor; the second on / off controllers in the second group are connected to the control board; when the voltage on the designated side of the first transformer meets the preset voltage imbalance condition, the signal processor controls the second on / off controllers in the first group to disconnect, so that the first transformer stops supplying power to the control coil, and the control coil controls the on / off contacts to open.

[0070] When the voltage on the designated side of the first transformer meets the preset voltage imbalance condition, the signal processor also sends a control signal to the control board, so that the control board controls the second on / off controller in the second part group to disconnect, so that the first transformer stops supplying power to the control coil, and the control coil controls the on / off contacts to open.

[0071] Figure 6 Taking two second on / off controllers as an example, the on / off contacts of the two first on / off controllers are connected in series between the first transformer and the heat dissipation assembly. Each second on / off controller is connected to a corresponding first on / off controller. One set of second on / off controllers is connected to a signal processor, which controls the on / off state of the second on / off controller. The other set of second on / off controllers is connected to a control board, which is connected to the signal processor. The signal processor sends control signals to the control board, which then controls the on / off state of the second on / off controller.

[0072] Furthermore, the auxiliary contacts of the first on / off controller corresponding to the second group are connected to a signal processor or control board. For example... Figure 6 In the first on / off controller connected to the control board, the auxiliary contact is connected to the control board. The signal generated by the auxiliary contact is sent to the control board, and then sent to the signal processor by the control board. The auxiliary contact can also be connected to the signal processor.

[0073] exist Figure 6 In the first on / off controller, which is connected to the signal processor, an auxiliary contact is connected to the signal processor, and the signal generated by the auxiliary contact is sent to the signal processor.

[0074] In the above method, the signal processor detects the mains voltage. When the mains voltage is unbalanced, the power supply to the heat dissipation component is disconnected through the on / off controller, thereby protecting the heat dissipation component, reducing the failure rate of the heat dissipation component, preventing mass failure, and extending the service life of the heat dissipation component.

[0075] This embodiment also provides a heat dissipation device, see reference. Figure 7 The heat dissipation device includes a heat dissipation component 70 and a heat dissipation component protection circuit 72.

[0076] This embodiment also provides a converter system, see [link to documentation]. Figure 8 The converter system includes: a converter 80, a first transformer 82, and a heat dissipation device 84; the input terminal of the first transformer is connected to the grid side of the converter. The output terminal of the first transformer is connected to the heat dissipation device.

[0077] Continue to refer to Figure 3 The signal processor is connected to the heat dissipation component protection circuit in the aforementioned converter connection heat dissipation device. The signal processor is also used to send a shutdown signal to the converter when the voltage meets a preset voltage imbalance condition, thereby controlling the converter to shut down. Specifically, the signal processor can be the converter's controller.

[0078] A third on / off controller is provided between the grid side of the converter and the first transformer to control the on / off connection between the grid side of the converter and the first transformer.

[0079] The converter is connected to the wind turbine on the machine side, and a second transformer is also connected to the grid side of the converter; the second transformer can specifically be a box-type transformer.

[0080] The heat dissipation device and converter system provided in this application have the same technical features as the heat dissipation component protection circuit provided in the above embodiments, so they can also solve the same technical problems and achieve the same technical effects.

[0081] This embodiment also provides the control flow of the heat dissipation component protection circuit under the start-up and standby conditions of the converter.

[0082] First, during startup operation, when the converter is fault-free, the main controller sends a startup command to the signal processor, such as output torque. The signal processor receives the startup command and controls the converter to start up and connect to the grid.

[0083] During converter operation, the signal processor monitors the voltage output from the grid side of the converter in real time and calculates the negative voltage sequence value. When the negative voltage sequence value is detected to exceed a specified multiple 'a' of the rated voltage, and the duration of the state 'the negative voltage sequence value exceeds a specified multiple of the rated voltage' exceeds the set duration T1, the signal processor first generates an over-limit fault of voltage imbalance and controls the converter to shut down.

[0084] It should be noted that the voltage imbalance condition in the aforementioned embodiments includes: when the negative voltage sequence value exceeds a specified multiple a of the rated voltage, and the duration of the state of 'the negative voltage sequence value exceeds a specified multiple of the rated voltage' exceeds a set duration T1.

[0085] After the signal processor confirms that the converter output power is zero and continues for a specified duration T2, it controls the second on / off controller to disconnect, and then the first on / off controller disconnects, thereby disconnecting the power supply to the heat dissipation component to prevent the heat dissipation component from failing due to prolonged grid voltage imbalance.

[0086] The signal processor continues to monitor the voltage output from the grid side of the converter and calculates the negative sequence value of the voltage. When the negative sequence value of the voltage drops to within the set range and the duration of the state of 'the negative sequence value of the voltage drops to within the set range' reaches the preset duration T3, the voltage is considered normal. At this time, the signal processor resets the fault, controls the second on / off controller to close and connect, and then the first on / off controller closes and connects. At this time, the auxiliary contact feeds back a 24V signal to the signal processor, and the signal processor determines that the heat dissipation component has started normally.

[0087] After the heat dissipation components are powered normally, the converter continues to receive the start-up command from the main controller, and the converter operates in grid-connected mode. When grid voltage imbalance is detected again, the above steps are repeated.

[0088] In standby mode, the converter stops modulation on the machine side, and the on / off state of the third on / off controller needs to be considered. The on / off state of the third on / off controller is controlled and monitored by the signal processor.

[0089] When the third on / off controller is disconnected, the grid side of the converter is in a standby state. At this time, the signal processor directly controls the second on / off controller to disconnect, and the heat dissipation components are not affected by the first transformer. When the signal processor receives a start-up command, it first controls the second on / off controller to close, ensuring normal power supply to the heat dissipation components, and then controls the third on / off controller to close, ensuring normal heat dissipation.

[0090] When the third on / off controller is not switched off, the grid side of the converter may be in modulation and there may be reactive power response. In order to ensure the normal temperature inside the cabinet, the heat dissipation components are in power standby mode at this time and are still affected by the grid voltage. They are controlled according to the steps under the operating conditions.

[0091] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0092] Furthermore, in the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0093] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0094] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0095] Finally, it should be noted that the above embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A protection circuit for the heat dissipation components of a converter, characterized in that, The heat dissipation assembly protection circuit comprises a first on-off controller and a signal processor; and an output end of the converter is connected with a first transformer; The first on-off controller is arranged between the heat dissipation assembly and the first transformer; and the first on-off controller is connected with the signal processor; The signal processor collects a specified side voltage of the first transformer; when the specified side voltage meets a preset voltage imbalance condition, the signal processor controls the first on-off controller to be disconnected, and the heat dissipation assembly stops running.

2. The heat dissipation assembly protection circuit according to claim 1, wherein the signal processor is connected between the converter and the first transformer, and the signal processor collects a primary side voltage of the first transformer; and / or the signal processor is connected between the heat dissipation assembly and the first transformer, and the signal processor collects a secondary side voltage of the first transformer. The heat dissipation assembly protection circuit further comprises a second on-off controller; the first on-off controller comprises a control coil and an on-off contact which are connected with each other; and the on-off contact is arranged between the heat dissipation assembly and the first transformer; The second on-off controller is arranged between the control coil and the first transformer; and the second on-off controller is further connected with the signal processor; 3. The heat sink assembly protection circuit of claim 1, wherein, When the specified side voltage of the first transformer meets the preset voltage imbalance condition, the signal processor controls the second on-off controller to be disconnected, the first transformer stops supplying power to the control coil, and the control coil controls the on-off contact to be disconnected. The first on-off controller further comprises an auxiliary contact; The auxiliary contact is connected between a specified power supply and the signal processor; 4. The heat sink assembly protection circuit of claim 3, wherein, When the auxiliary contact is closed, the specified power supply provides a voltage signal of the specified power supply to the signal processor; When the specified side voltage meets the preset voltage imbalance condition, the signal processor controls the auxiliary contact to be disconnected, so as to stop providing the voltage signal of the specified power supply to the signal processor. The heat dissipation assembly protection circuit further comprises a control board, and the first on-off controller comprises a plurality of first on-off controllers; The control board is connected with the signal processor, and the control board is further connected with the plurality of first on-off controllers respectively; and the plurality of first on-off controllers are connected in series between the heat dissipation assembly and the first transformer; 5. The heat sink assembly protection circuit of claim 1, wherein, When the specified side voltage of the first transformer meets the preset voltage imbalance condition, the signal processor sends a control signal to the control board, so as to control each of the first on-off controllers to be disconnected through the control board. The heat dissipation assembly protection circuit further comprises a plurality of second on-off controllers; the second on-off controllers correspond to the first on-off controllers one by one; the first on-off controller comprises a control coil and an on-off contact which are connected with each other; and the on-off contacts of the plurality of first on-off controllers are connected in series between the heat dissipation assembly and the first transformer. ​ 6. The heat sink assembly protection circuit of claim 5, wherein, ​ Each of the second on-off controllers is arranged between the control coil and the first transformer in the corresponding first on-off controller; and the second on-off controllers are connected to the control board; When the specified side voltage of the first transformer meets a preset voltage imbalance condition, the signal processor sends a control signal to the control board to control the second on-off controllers to be turned off by the control board, so that the first transformer stops supplying power to the control coil, and the control coil controls the on-off contact to be turned off.

7. The heat sink assembly protection circuit of claim 5, wherein, The heat dissipation assembly protection circuit further comprises a plurality of second on-off controllers; the second on-off controllers correspond to the first on-off controllers one by one; the first on-off controller comprises a control coil and an on-off contact connected to each other; the on-off contacts of the plurality of first on-off controllers are connected in series between the heat dissipation assembly and the first transformer; Each of the second on-off controllers is arranged between the control coil and the first transformer in the corresponding first on-off controller; and the second on-off controllers are connected to the control board; Among the plurality of second on-off controllers, the second on-off controllers in a first group are connected to the signal processor, and the second on-off controllers in a second group are connected to the control board; When the specified side voltage of the first transformer meets a preset voltage imbalance condition, the signal processor controls the second on-off controllers in the first group to be turned off, so that the first transformer stops supplying power to the control coil, and the control coil controls the on-off contact to be turned off; When the specified side voltage of the first transformer meets a preset voltage imbalance condition, the signal processor further sends a control signal to the control board to control the second on-off controllers in the second group to be turned off, so that the first transformer stops supplying power to the control coil, and the control coil controls the on-off contact to be turned off.

8. The heat sink assembly protection circuit of claim 7, wherein, The auxiliary contact of the first on-off controller corresponding to the second group is connected to the signal processor or the control board.

9. A heat dissipating device characterized by comprising: The heat dissipation device comprises a heat dissipation assembly and the heat dissipation assembly protection circuit according to any one of claims 1-8.

10. A converter system characterized by The converter system comprises a converter, a first transformer, and the heat dissipation device according to claim 9; The primary side of the first transformer is connected to the grid side of the converter.

11. The converter system of claim 10, wherein, The converter is connected to the signal processor of the heat dissipation assembly protection circuit in the heat dissipation device. The signal processor is further configured to send a shutdown signal to the converter to control the converter to shut down when the specified side voltage of the first transformer meets a preset voltage imbalance condition.

12. The converter system of claim 10, wherein, A third on-off controller is arranged between the grid side of the converter and the primary side of the first transformer.

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