Method and device for controlling solid-state circuit breaker and solid-state circuit breaker

Abstract

The present application relates to a method, device and solid-state circuit breaker for controlling a solid-state circuit breaker. The method for controlling a solid-state circuit breaker includes: detecting the direction of the current passing through the solid-state circuit breaker, the solid-state circuit breaker being located at the power supply end of the grid bus in a DC power grid; obtaining the breaking current value of the solid-state circuit breaker according to the direction of the detected current; obtaining the maximum threshold current value allowed to pass through the solid-state circuit breaker, the breaking current value being less than the maximum threshold current value; obtaining the predicted current value of the current that will arrive in the next sampling cycle of the current sampling cycle of the solid-state circuit breaker; comparing the predicted current value with the breaking current value; and if the predicted current value is greater than the breaking current value, causing the solid-state circuit breaker to wait until the predicted current value is greater than the maximum threshold current value, causing the solid-state circuit breaker to disconnect the circuit where the solid-state circuit breaker is located. The technical solution of the present application is used to achieve selective disconnection of solid-state circuit breakers in a DC power grid.

Description

Technical Field

[0001] This application relates to the field of circuit control. Specifically, this application relates to a method, apparatus, and solid-state circuit breaker for controlling a solid-state circuit breaker. Background Art

[0002] For a DC power supply system, it is desirable to disconnect the circuit by using a circuit breaker when a fault is detected, so as to perform equipment maintenance. There may be multiple circuit breakers in the circuit. When a fault is detected at a location on the circuit, if multiple circuit breakers that detect the fault all perform the operation of disconnecting the circuit, then too many devices are disconnected for this fault, which will affect the normal operation of other devices in the circuit and increase the complexity of troubleshooting.

[0003] Solid-state circuit breakers are applied in DC power supply systems and have the advantage of quickly responding to faults in the circuit. A solid-state circuit breaker has a threshold value for interrupting current, and the current passing through the solid-state circuit breaker is limited. If the fault current exceeds the threshold value of the interrupting current, the solid-state circuit breaker performs the operation of disconnecting the circuit. The solid-state circuit breaker operates within a safe current range. If the current passing through the solid-state circuit breaker exceeds the safe current range, the solid-state circuit breaker will be damaged.

[0004] If a fault occurs at a location in the circuit, it is difficult to correctly and selectively disconnect the device close to the fault location when considering device protection and the coordination between the self-protection functions of the circuit breaker and the converter. For example, since devices such as motors as loads may generate currents flowing from the load end of the power grid to the power supply end of the power grid, the solid-state circuit breaker at the load end of the power grid may incorrectly disconnect the circuit, making it difficult to selectively disconnect the device that needs to be disconnected, and may even damage the solid-state circuit breaker. Summary of the Invention

[0005] Embodiments of this application provide a method, apparatus, and solid-state circuit breaker for controlling a solid-state circuit breaker, so as to at least solve the problem in the prior art that it is difficult to selectively disconnect the device close to the fault location.

[0006] According to one aspect of the embodiments of this application, a method for controlling a solid-state circuit breaker is provided, including: detecting the direction of the current passing through the solid-state circuit breaker, where the solid-state circuit breaker is located at the power supply end of the grid bus in the DC power grid; obtaining the interrupting current value of the solid-state circuit breaker according to the detected direction of the current; obtaining the maximum threshold current value allowed to pass through the solid-state circuit breaker, where the interrupting current value is less than the maximum threshold current value; obtaining the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker; comparing the predicted current value with the interrupting current value; and if the predicted current value is greater than the interrupting current value, making the solid-state circuit breaker wait until the predicted current value is greater than the maximum threshold current value, and then making the solid-state circuit breaker disconnect the circuit where the solid-state circuit breaker is located.

[0007] In this way, a waiting time is set for the solid-state circuit breaker at the power supply end, so that the solid-state circuit breaker does not immediately perform the operation of disconnecting the circuit when detecting a fault current, and the circuit breakers at other positions on the circuit can detect the fault, thereby achieving selective circuit protection that causes the circuit breaker close to the fault to disconnect the circuit.

[0008] According to an exemplary embodiment of the present application, the method further includes: obtaining a current value detected within a sampling period of the solid-state circuit breaker; determining a predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker according to the detected current value.

[0009] In this way, according to the current value of the current that has been detected by the solid-state circuit breaker, the current value of the upcoming current is predicted, so that the solid-state circuit breaker can judge in advance whether to perform the operation of disconnecting the circuit.

[0010] According to an exemplary embodiment of the present application, the direction of the detected current includes a positive direction and a reverse direction, where the positive direction represents the direction from the power supply end of the solid-state circuit breaker to the load end, and the reverse direction represents the direction from the load end of the solid-state circuit breaker to the power supply end, and the breaking current value includes a positive breaking current value corresponding to the current in the positive direction and a reverse breaking current value corresponding to the current in the reverse direction, where the positive breaking current value represents the current value of the breaking current of the solid-state circuit breaker when the current in the positive direction passes through the solid-state circuit breaker, and the reverse breaking current value represents the current value of the breaking current of the solid-state circuit breaker when the current in the reverse direction passes through the solid-state circuit breaker.

[0011] In this way, for the solid-state circuit breaker located at the power supply end of the grid bus, the direction of the fault current is detected, so that different methods of controlling the solid-state circuit breaker are adopted for different fault position situations, and the selective circuit protection of the solid-state circuit breaker operates normally.

[0012] According to an exemplary embodiment of the present application, if the direction of the detected current is positive, obtaining the breaking current value of the solid-state circuit breaker includes obtaining the positive breaking current value of the solid-state circuit breaker, and comparing the predicted current value with the breaking current value includes comparing the predicted current value with the positive breaking current value.

[0013] In this way, the current value of the current flowing from the power supply end to the load end in the circuit is compared with the positive breaking current value corresponding to this direction to judge whether to operate the solid-state circuit breaker to perform protection on the circuit for the current in this direction, and selective protection of the circuit is performed when the current is flowing in the positive direction.

[0014] According to an exemplary embodiment of the present application, if the detected current direction is reverse, obtaining the breaking current value of the solid-state circuit breaker includes obtaining the reverse breaking current value of the solid-state circuit breaker, and comparing the predicted current value with the breaking current value includes comparing the predicted current value with the reverse breaking current value.

[0015] In this way, the current value of the current flowing from the load end to the power supply end in the circuit is compared with the reverse breaking current value corresponding to this direction to determine whether to operate the solid-state circuit breaker to protect the circuit for the current in this direction, and perform selective protection of the circuit when the current is flowing in the reverse direction.

[0016] According to another aspect of the embodiments of the present application, there is also provided a method for controlling a solid-state circuit breaker, including: detecting the direction of the current passing through the solid-state circuit breaker, where the solid-state circuit breaker is located at the load end of the grid bus in a DC grid; obtaining the maximum threshold current value allowed to pass through the solid-state circuit breaker; obtaining the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker; if the detected current direction is from the load end of the solid-state circuit breaker to the power supply end direction, comparing the predicted current value with the maximum threshold current value; and if the predicted current value is greater than the maximum threshold current value, causing the solid-state circuit breaker to disconnect the circuit where the solid-state circuit breaker is located.

[0017] In this way, when a reverse fault current passes through the solid-state circuit breaker located at the load end of the grid bus in a DC grid, the solid-state circuit breaker waits without immediately disconnecting the circuit until the predicted current value is greater than the maximum threshold current value, and then disconnects the circuit where the solid-state circuit breaker is located, enabling the solid-state circuit breaker closer to the fault location to disconnect the circuit first.

[0018] According to an exemplary embodiment of the present application, it further includes: obtaining the breaking current value of the solid-state circuit breaker, where if the detected current direction is from the power supply end of the solid-state circuit breaker to the load end direction, comparing the predicted current value with the breaking current value; and if the predicted current value is greater than the breaking current value, causing the solid-state circuit breaker to disconnect the circuit where the solid-state circuit breaker is located.

[0019] In this way, when a forward fault current passes through the solid-state circuit breaker located at the load end of the grid bus in a DC grid, the solid-state circuit breaker can disconnect the circuit first as the solid-state circuit breaker closer to the fault location.

[0020] According to an exemplary embodiment of the present application, the method further includes: obtaining the current value detected within the sampling period of the solid-state circuit breaker; determining the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker according to the detected current value.

[0021] In this way, the current value of the upcoming current is predicted based on the current value detected by the solid-state circuit breaker, enabling the solid-state circuit breaker to determine in advance whether to perform the operation of disconnecting the circuit.

[0022] According to another aspect of the embodiments of the present application, there is also provided a device for controlling a solid-state circuit breaker, including: a current direction detection unit configured to detect the direction of the current passing through the solid-state circuit breaker, where the solid-state circuit breaker is located at the power supply end of the grid bus in a DC power grid; a breaking current value acquisition unit configured to acquire the breaking current value of the solid-state circuit breaker according to the detected direction of the current; a maximum threshold acquisition unit configured to acquire the maximum threshold current value allowed to pass through the solid-state circuit breaker, and the breaking current value is less than the maximum threshold current value; a predicted current value acquisition unit configured to acquire the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker; a comparison unit configured to compare the predicted current value with the breaking current value; and a breaking unit configured to, if the predicted current value is greater than the breaking current value, make the solid-state circuit breaker wait until the predicted current value is greater than the maximum threshold current value, and then make the solid-state circuit breaker disconnect the circuit where the solid-state circuit breaker is located.

[0023] In this way, the device for controlling the solid-state circuit breaker is set to set a waiting time for the solid-state circuit breaker at the power supply end, so that the solid-state circuit breaker does not immediately perform the operation of disconnecting the circuit when detecting a fault current, and circuit breakers at other positions on the circuit can detect the fault, thereby achieving selective circuit protection that enables the circuit breaker close to the fault to disconnect the circuit.

[0024] The device for controlling a solid-state circuit breaker includes: a current direction detection unit configured to detect the direction of the current passing through the solid-state circuit breaker, where the solid-state circuit breaker is located at the load end of the grid bus in a DC power grid; a maximum threshold acquisition unit configured to acquire the maximum threshold current value allowed to pass through the solid-state circuit breaker; a predicted current value acquisition unit configured to acquire the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker; a comparison unit configured to compare the predicted current value with the maximum threshold current value if the detected direction of the current is from the load end of the solid-state circuit breaker to the power supply end; and a breaking unit configured to, if the predicted current value is greater than the maximum threshold current value, make the solid-state circuit breaker disconnect the circuit where the solid-state circuit breaker is located.

[0025] In this way, the device for controlling the solid-state circuit breaker is set to set a waiting time for the solid-state circuit breaker at the load end, so that the solid-state circuit breaker does not immediately perform the operation of disconnecting the circuit when detecting a fault current, and circuit breakers at other positions on the circuit can detect the fault, thereby achieving selective circuit protection that enables the circuit breaker close to the fault to disconnect the circuit.

[0026] According to another aspect of the embodiments of the present application, a solid-state circuit breaker is further provided. The solid-state circuit breaker is located at the power supply end of the grid bus in a DC grid and includes a device for controlling the solid-state circuit breaker. The device includes: a current direction detection unit configured to detect the direction of the current passing through the solid-state circuit breaker; a breaking current value acquisition unit configured to acquire the breaking current value of the solid-state circuit breaker according to the detected direction of the current; a maximum threshold acquisition unit configured to acquire the maximum threshold current value allowed to pass through the solid-state circuit breaker, and the breaking current value is less than the maximum threshold current value; a predicted current value acquisition unit configured to acquire the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker; a comparison unit configured to compare the predicted current value with the breaking current value; and a breaking unit configured to, if the predicted current value is greater than the breaking current value, cause the solid-state circuit breaker to wait until the predicted current value is greater than the maximum threshold current value, and then cause the solid-state circuit breaker to disconnect the circuit where the solid-state circuit breaker is located.

[0027] In this way, a device for controlling the solid-state circuit breaker is provided in the solid-state circuit breaker at the power supply end, and a waiting time is set for the solid-state circuit breaker, so that the solid-state circuit breaker does not immediately perform the operation of disconnecting the circuit when detecting a fault current, enabling the circuit breakers at other positions on the circuit to detect the fault, thereby achieving selective circuit protection for the circuit breaker close to the fault to disconnect the circuit.

[0028] According to an exemplary embodiment of the present application, the solid-state circuit breaker further includes: a current limiting unit configured to limit the current rising speed passing through the solid-state circuit breaker.

[0029] In this way, it is avoided that the current passing through the solid-state circuit breaker increases rapidly, causing damage to the solid-state circuit breaker.

[0030] According to another aspect of the embodiments of the present application, a solid-state circuit breaker is further provided. The solid-state circuit breaker is located at the load end of the grid bus in a DC grid. The solid-state circuit breaker includes a device for controlling the solid-state circuit breaker. The device includes: a current direction detection unit configured to detect the direction of the current passing through the solid-state circuit breaker; a maximum threshold acquisition unit configured to acquire the maximum threshold current value allowed to pass through the solid-state circuit breaker; a predicted current value acquisition unit configured to acquire the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker; a comparison unit configured to, if the detected direction of the current is from the load end of the solid-state circuit breaker to the power supply end direction, compare the predicted current value with the maximum threshold current value; and a breaking unit configured to, if the predicted current value is greater than the maximum threshold current value, cause the solid-state circuit breaker to disconnect the circuit where the solid-state circuit breaker is located.

[0031] In this way, a device for controlling the solid-state circuit breaker is arranged in the solid-state circuit breaker at the load end, and a waiting time is set for the solid-state circuit breaker, so that the solid-state circuit breaker does not immediately perform the operation of disconnecting the circuit when detecting a fault current, enabling the circuit breakers at other positions on the circuit to detect the fault, thereby realizing the selective circuit protection of disconnecting the circuit breaker close to the fault.

[0032] In the embodiment of the present application, a technical solution for setting a waiting time for the solid-state circuit breaker is provided. The direction of the current passing through the solid-state circuit breaker is detected. For the current flowing from the power supply end of the power grid to the load end, if the solid-state circuit breaker at the power supply end detects that the predicted value of the upcoming current exceeds its preset forward breaking current, the solid-state circuit breaker does not immediately disconnect the circuit, but waits for a period of time until it is determined through the predicted value of the estimated current that the upcoming current exceeds the maximum threshold current value of the solid-state circuit breaker or will damage the solid-state circuit breaker, and then the solid-state circuit breaker performs the operation of disconnecting the circuit; or for the current flowing from the load end of the power grid to the power supply end, if the solid-state circuit breaker at the load end detects that the predicted value of the upcoming current exceeds the maximum threshold current value of the solid-state circuit breaker or will damage the solid-state circuit breaker, the solid-state circuit breaker performs the operation of disconnecting the circuit, so as to at least solve the technical problem of difficultly achieving safe and correct disconnection of the equipment close to the fault position in the DC power grid, and achieve the technical effects of protecting the solid-state circuit breaker and disconnecting the circuit that needs to be disconnected during a fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0034] Figure 1 is a schematic diagram of a circuit system adopting a circuit protection scheme with a solid-state circuit breaker;

[0035] Figure 2 is a flowchart of a method for controlling a solid-state circuit breaker according to an embodiment of the present application;

[0036] Figure 3 is a flowchart of a method for controlling a solid-state circuit breaker according to another embodiment of the present application;

[0037] Figure 4 is a schematic diagram of a device for controlling a solid-state circuit breaker according to an embodiment of the present application;

[0038] Figure 5 is a schematic diagram of a device for controlling a solid-state circuit breaker according to another embodiment of the present application;

[0039] Figure 6Schematic diagram of a solid-state circuit breaker according to an embodiment of the present application;

[0040] Figure 7 Schematic diagram of a solid-state circuit breaker according to an exemplary embodiment of the present application;

[0041] Figure 8 Schematic diagram of a solid-state circuit breaker according to another embodiment of the present application;

[0042] Figure 9 Schematic diagram of a solid-state circuit breaker according to an exemplary embodiment of the present application.

[0043] Description of the accompanying drawings:

[0044] 100, AC power supply;

[0045] 110, 120, AC / DC converter;

[0046] 130, battery power supply;

[0047] 140, photovoltaic power supply;

[0048] 150, DC bus;

[0049] PD-S1.1, PD-S1.2, PD-S2.1, PD-S2.2, PD-S3.1, PD-S3.2, PD-S4.1, PD-S4.2, PD-L1, PD-L2, PD-L3, PD-L4, solid-state circuit breaker;

[0050] 111, 113, 115, 117, load;

[0051] F1~F3, possible fault locations;

[0052] S201~S211, S301~S309, steps;

[0053] 4, device for controlling the solid-state circuit breaker

[0054] 401, current direction detection unit;

[0055] 403, breaking current value acquisition unit;

[0056] 405, maximum threshold acquisition unit;

[0057] 407, predicted current value acquisition unit;

[0058] 409, comparison unit;

[0059] 411, breaking unit;

[0060] 5, device for controlling the solid-state circuit breaker;

[0061] 501, current direction detection unit;

[0062] 503, maximum threshold value acquisition unit;

[0063] 505, predicted current value acquisition unit;

[0064] 507, comparison unit;

[0065] 509, breaking unit;

[0066] 6, 7, solid state circuit breaker;

[0067] 61, 71, current limiting element. Detailed implementation manners

[0068] In order to enable those skilled in the art of the present technology to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0069] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or modules or units does not necessarily have to be limited to those steps or modules or units clearly listed, but may include other steps or modules or units not clearly listed or inherent to these processes, methods, products or devices.

[0070] Figure 1 is a schematic diagram of a circuit system adopting a circuit protection solution implemented by a solid state circuit breaker. As Figure 1As shown, circuit 10 includes an AC power supply 100, AC / DC converters 110 and 120, a battery power supply 130, a photovoltaic power supply 140, loads 111, 113, 115, and 117. The AC / DC converters 110 and 120, the battery power supply 130, the photovoltaic power supply 140, and the loads 111, 113, 115, and 117 are connected through a DC grid bus 150. Solid-state circuit breakers PD-S1.1 and PD-S1.2 are connected in series at the power supply end of the grid between the AC / DC converter 110 and the DC grid bus 150. Solid-state circuit breakers PD-S2.1 and PD-S2.2 are connected in series at the power supply end of the grid between the AC / DC converter 120 and the DC grid bus 150. Solid-state circuit breakers PD-S3.1 and PD-S3.2 are connected in series at the power supply end of the grid between the battery power supply 130 and the DC grid bus 150. Solid-state circuit breakers PD-S4.1 and PD-S4.2 are connected in series at the power supply end of the grid between the photovoltaic power supply 140 and the DC grid bus 150. Solid-state circuit breakers PD-L1, PD-L2, PD-L3, and PD-L4 are connected in series at the load end of the grid between the loads 111, 113, 115, and 117 and the DC grid bus 150. F1, F2, and F3 respectively represent the positions where faults may occur.

[0071] For the selective protection of the desired circuit, it is desirable that only the circuits close to the fault location are disconnected, so that other devices can continue to operate without being affected by the fault. If a fault occurs at F1, it is desirable that only the solid-state circuit breakers PD-S1.1 and PD-S1.2 close to the fault location disconnect the circuit. In other words, if a fault occurs at F1, it is desirable that the solid-state circuit breakers PD-S1.1 and PD-S1.2 perform the operation of disconnecting the circuit before other solid-state circuit breakers disconnect the circuit and without damaging the components in the circuit. If a fault occurs at F2, it is desirable that all the solid-state circuit breakers at the power supply end, namely, solid-state circuit breakers PD-S1.1, PD-S1.2, PD-S2.1, PD-S2.2, PD-S3.1, PD-S3.2, PD-S4.1, and PD-S4.2 perform the operation of disconnecting the circuit without damaging the power supply. If a fault occurs at F3, it is desirable that only the solid-state circuit breaker PD-L1 at the load end performs the operation of disconnecting the circuit without affecting other solid-state circuit breakers or the power supply. In this way, through selective protection, only the solid-state circuit breakers close to the fault location perform the operation of disconnecting the circuit, correctly disconnecting the devices affected by the fault from the circuit.

[0072] To achieve effective selective circuit protection, according to an embodiment of the present application, a method for controlling a solid-state circuit breaker is provided. In an embodiment according to the present application, in, for example, Figure 1 the DC grid system shown, a solid-state circuit breaker is used to disconnect a device from a faulty circuit. The solid-state circuit breaker is arranged at the power supply end and the load end of the DC grid bus. In the face of a DC fault, the solid-state circuit breaker has a faster response speed compared to a converter or an inverter. For example, the self-protection response period of a converter or an inverter is usually greater than 40 μs, while the response period of the solid-state circuit breaker is usually about 10 μs. In this way, if a solid-state circuit breaker is used to disconnect a device from a faulty circuit, it can be more rapid, thereby protecting the device, and at the same time, it can ensure that the solid-state circuit breaker responds before the self-protection of the converter or the inverter to cooperate correctly.

[0073] In an embodiment of the present application, in addition to the traditional current threshold for breaking the circuit that the solid-state circuit breaker itself has, for the solid-state circuit breaker arranged at the power supply end and the load end, a safety current threshold is also set for it. If the current value of the current passing through the solid-state circuit breaker exceeds this safety current threshold, it indicates that an excessive current may damage the solid-state circuit breaker. The safety current threshold (maximum threshold current value) of the solid-state circuit breaker should be greater than the current threshold (breaking current value) for breaking the circuit of this solid-state circuit breaker. Otherwise, if the current passing through this solid-state circuit breaker is greater than the current threshold for breaking the circuit of this solid-state circuit breaker and this solid-state circuit breaker does not perform the operation of disconnecting the circuit, the solid-state circuit breaker will be damaged due to the current in the circuit exceeding the safety current threshold. The safety current threshold of the solid-state circuit breaker being greater than the current threshold for breaking the circuit enables the solid-state circuit breaker not to be damaged even when the solid-state circuit breaker does not immediately disconnect the circuit while the current is greater than the current threshold for breaking the circuit. Such a solid-state circuit breaker can achieve a waiting operation when it detects that the current is greater than the current threshold for breaking the circuit, and reserve the opportunity to respond for other solid-state circuit breakers that may be closer to the fault location. That is, when a certain solid-state circuit breaker detects a fault current, it first waits for a period of time until another solid-state circuit breaker closer to the fault location performs the operation of disconnecting, so as to achieve selective protection of the circuit. If it is detected during the waiting process of the solid-state circuit breaker that the upcoming current is about to exceed its safety current threshold, then this solid-state circuit breaker performs the operation of disconnecting the circuit to protect itself from being damaged.

[0074] Figure 2 is a flowchart of a method for controlling a solid-state circuit breaker according to an embodiment of the present application. As Figure 2 shown, the method for controlling a solid-state circuit breaker according to an embodiment of the present application includes: Step S201, detecting the direction of the current passing through the solid-state circuit breaker. In this embodiment, the solid-state circuit breaker is located at the power supply end of the grid bus in the DC grid. For example, Figure 1PD-S1.1, PD-S1.2, etc. in []. For example, for the solid-state circuit breaker PD-S1.2 set at the power supply end, if the fault location is at F1, the direction of the fault current passing through the solid-state circuit breaker PD-S1.2 is from the load end to the power supply end. If the fault location is at F2 or F3, the direction of the fault current passing through the solid-state circuit breaker PD-S1.2 is from the power supply end to the load end. Different fault occurrence locations will result in different directions of the fault current passing through the solid-state circuit breaker. In step S203, obtain the breaking current value of the solid-state circuit breaker according to the detected direction of the current. If the detected fault current is greater than the breaking current value in the corresponding direction, the traditional solid-state circuit breaker will perform the operation of breaking the circuit. In step S205, obtain the maximum threshold current value allowed to pass through the solid-state circuit breaker, and the breaking current value is less than the maximum threshold current value. The maximum threshold current value is the maximum safe current value of the solid-state circuit breaker. If the current passing through the solid-state circuit breaker exceeds this maximum threshold current value, the solid-state circuit breaker may be damaged. In step S207, obtain the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker. The solid-state circuit breaker according to the present application will respond before the current exceeding the maximum threshold current value arrives at the solid-state circuit breaker. That is, the calculation of the current value of the upcoming next sampling period is achieved through prediction, so as to prevent the solid-state circuit breaker from being damaged due to the current value increasing speed exceeding the maximum threshold current value within one sampling period. In step S209, compare the predicted current value with the breaking current value. In step S211, if the predicted current value is greater than the breaking current value, make the solid-state circuit breaker wait until the predicted current value is greater than the maximum threshold current value, and then make the solid-state circuit breaker disconnect the circuit where the solid-state circuit breaker is located. The predicted current value being greater than the breaking current value indicates that there is a fault current passing through the solid-state circuit breaker. If the solid-state circuit breaker immediately disconnects the circuit, the equipment it protects will be disconnected from the circuit. It can be foreseen that if all the solid-state circuit breakers detecting the fault current immediately perform the operation of disconnecting the circuit, then in the circuit, in addition to the equipment closest to the fault location, many normally operating equipment will also be disconnected from the circuit by the solid-state circuit breakers, which is not desired for the selective protection of the circuit. In the embodiment of the present application, the solid-state circuit breaker does not immediately perform the operation of disconnecting the circuit when detecting the fault current, but performs a waiting operation until the predicted current value of the predicted next sampling period exceeds the maximum threshold current value or the upcoming current may damage the solid-state circuit breaker, and then performs the operation of disconnecting the circuit. During the waiting period of the solid-state circuit breaker at the power supply end, if the solid-state circuit breaker at other fault locations disconnects the circuit (for example, the solid-state circuit breaker near the fault location disconnects the circuit) and the fault current disappears, then this solid-state circuit breaker does not need to disconnect the circuit anymore, enabling the equipment and circuit protected by this solid-state circuit breaker to operate normally, while the equipment or circuit affected by the fault has been disconnected from the circuit by the solid-state circuit breakers at other fault locations that have performed the operation of disconnecting the circuit, thereby achieving the selective protection of the circuit.

[0075] According to an exemplary embodiment of the present application, the method further includes: obtaining a current value detected within a sampling period of the solid-state circuit breaker; determining a predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker according to the detected current value. In the method for controlling a solid-state circuit breaker according to an embodiment of the present application, in order to ensure that the current passing through the solid-state circuit breaker does not exceed its safe current threshold, the current value detected by the solid-state circuit breaker within each sampling period of its detected current is obtained, and the predicted current value of the current that will arrive in the next sampling period is estimated according to the detected current value and the time length of the next sampling period of the current sampling period, or the current peak value of the upcoming current is predicted according to the parameters in the circuit system. During the time of the current sampling period, if it is calculated that the predicted current value or the current peak value of the upcoming current exceeds the breaking current value of the solid-state circuit breaker, it indicates that a fault current is about to occur and a fault may occur in the circuit. During the time of the current sampling period, if it is calculated that the predicted current value or the current peak value of the upcoming current exceeds the safe current threshold of the solid-state circuit breaker, the solid-state circuit breaker is made to perform an operation of disconnecting the circuit, so as to disconnect the circuit before the current that may cause damage to the solid-state circuit breaker reaches the solid-state circuit breaker, ensuring the safety of the device. In the method for controlling a solid-state circuit breaker according to an embodiment of the present application, the predicted current value of the upcoming current is determined according to the current value already detected by the solid-state circuit breaker, enabling the solid-state circuit breaker to pre-judge whether a fault current will occur and whether to perform an operation of disconnecting the circuit. The determination of the predicted current value of the upcoming current can also be based on different sampling periods. For example, the current values of the current within a predetermined period of time after the current sampling period are predicted.

[0076] According to an exemplary embodiment of the present application, the direction of the detected current includes a forward direction and a reverse direction. Among them, the forward direction represents the direction from the power supply end of the solid-state circuit breaker to the load end, and the reverse direction represents the direction from the load end of the solid-state circuit breaker to the power supply end. And, the breaking current value includes a forward breaking current value corresponding to the forward current and a reverse breaking current value corresponding to the reverse current. Among them, the forward breaking current value represents the current value of the breaking current of the solid-state circuit breaker when the forward current passes through the solid-state circuit breaker, and the reverse breaking current value represents the current value of the breaking current of the solid-state circuit breaker when the reverse current passes through the solid-state circuit breaker.

[0077] According to an exemplary embodiment of the present application, if the detected current direction is forward, obtaining the breaking current value of the solid-state circuit breaker includes obtaining the forward breaking current value of the solid-state circuit breaker, and comparing the predicted current value with the breaking current value includes comparing the predicted current value with the forward breaking current value. Comparing the current value of the current flowing from the power supply end to the load end in the circuit with the forward breaking current value corresponding to this direction to determine whether to operate the solid-state circuit breaker to perform protection on the circuit for the current in this direction, and performing selective protection of the circuit when the current is flowing forward.

[0078] According to an exemplary embodiment of the present application, if the detected current direction is reverse, obtaining the breaking current value of the solid-state circuit breaker includes obtaining the reverse breaking current value of the solid-state circuit breaker, and comparing the predicted current value with the breaking current value includes comparing the predicted current value with the reverse breaking current value. Comparing the current value of the current flowing from the load end to the power supply end in the circuit with the reverse breaking current value corresponding to this direction to determine whether to operate the solid-state circuit breaker to perform protection on the circuit for the current in this direction, and performing selective protection of the circuit when the current is flowing reverse.

[0079] Such as Figure 1As shown, for a solid-state circuit breaker provided at the power supply end of the DC grid bus 150, such as the solid-state circuit breaker PD-S1.2, if the fault location is at F2 or F3, the fault current is a forward current, that is, the current flows from the power supply end to the load end. To determine whether a fault current is detected, the fault current value (for example, the predicted value of the upcoming current described above) is compared with the forward breaking current of this solid-state circuit breaker PD-S1.2. If the fault current value is greater than the forward breaking current, it indicates that a fault has occurred in the load-end circuit of the solid-state circuit breaker PD-S1.2. If the fault location is at F1, for the solid-state circuit breaker PD-S1.2, the fault current (for example, the reverse current delivered by the motor acting as a load to the circuit) will flow from the load end of the solid-state circuit breaker PD-S1.2 through the solid-state circuit breaker PD-S1.2 to the power supply end of the solid-state circuit breaker PD-S1.2. To determine whether a fault current is detected, the fault current value is compared with the reverse breaking current of this solid-state circuit breaker PD-S1.2. If the fault current value is greater than the reverse breaking current, it indicates that a fault has occurred in the power supply-end circuit of the solid-state circuit breaker PD-S1.2. That is to say, for the solid-state circuit breaker provided at the power supply end of the DC grid bus 150, in addition to the forward breaking current value for the forward current, a reverse breaking current value is also set so that the fault location at its power supply end or load end can trigger the operation of the breaking circuit. The direction of the detected fault current indicates that the fault location may occur at the power supply end or the load end of the solid-state circuit breaker. The direction of the fault current is detected for the solid-state circuit breaker located at the power supply end of the grid bus, so that different methods of controlling the solid-state circuit breaker are adopted for different fault location situations, enabling the selective circuit protection of the solid-state circuit breaker to operate normally.

[0080] As Figure 1 shown, for example, a fault occurs at location F3. The fault current passing through the solid-state circuit breaker PD-S1.2 is a forward current. When the solid-state circuit breaker PD-S1.2 detects the fault current (that is, the predicted value of the current is greater than the forward breaking current), it does not immediately perform the operation of breaking the circuit, but waits. Then, the solid-state circuit breaker near F3 (for example, the solid-state circuit breaker PD-L1 at the load end) performs the operation of disconnecting the circuit, isolating the fault location from the grid, and the fault current disappears. The solid-state circuit breaker PD-S1.2 does not have to disconnect, and the power supply branch where the solid-state circuit breaker PD-S1.2 is located is not affected by the fault, achieving the selective protection of the circuit. Or, for example, within the waiting time of the solid-state circuit breaker PD-S1.2, if the predicted value of the current exceeds the maximum threshold current value of the solid-state circuit breaker PD-S1.2, the solid-state circuit breaker PD-S1.2 performs the operation of disconnecting the circuit to protect the safety of the equipment.

[0081] According to another embodiment of the embodiments of the present application, a method for controlling a solid-state circuit breaker is further provided. Figure 3is a flowchart of a method for controlling a solid-state circuit breaker according to another embodiment of the present application. As Figure 3 shown, the method for controlling a solid-state circuit breaker according to another embodiment of the present application includes: step S301, detecting the direction of the current passing through the solid-state circuit breaker. In the method for controlling a solid-state circuit breaker according to another embodiment of the present application, the solid-state circuit breaker is located at the load end of the grid bus in a DC grid. Step S303, obtaining the maximum threshold current value allowed to pass through the solid-state circuit breaker. Step S305, obtaining the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker. Step S307, if the detected direction of the current is from the load end of the solid-state circuit breaker to the power supply end, comparing the predicted current value with the maximum threshold current value. And step S309, if the predicted current value is greater than the maximum threshold current value, disconnecting the circuit where the solid-state circuit breaker is located by the solid-state circuit breaker.

[0082] As Figure 1 shown, for example, the solid-state circuit breaker located at the load end of the grid bus in the DC grid, such as the solid-state circuit breaker PD-L1, is connected to the load 111. If it is detected that the direction of the current passing through the solid-state circuit breaker PD-L1 is from the load 111 to the power supply end of the solid-state circuit breaker PD-L1, in other words, the direction of the fault current is reverse, then it indicates that the fault location is at the power supply end of the solid-state circuit breaker PD-L1. Therefore, the load branch where the F3 position and the load 111 are located does not have to be disconnected from the grid. In principle, the operation of disconnecting the circuit should be performed by other solid-state circuit breakers close to the fault location except the solid-state circuit breaker PD-L1, and the solid-state circuit breaker PD-L1 only disconnects the circuit when the fault current may cause damage to itself.

[0083] As Figure 1 shown, for example, if a fault occurs at the F1 position, the solid-state circuit breaker PD-L1 detects a reverse current. The solid-state circuit breaker PD-L1 only disconnects its branch from the grid when the predicted value of the upcoming current exceeds its own safety threshold current value. Before that, the solid-state circuit breakers PD-S1.1 and PD-S1.2 detect the fault current and perform the operation of disconnecting the circuit, thereby isolating the fault location F1 from the grid. In this way, when the reverse fault current passes through the solid-state circuit breaker located at the load end of the grid bus in the DC grid, the solid-state circuit breaker waits without immediately disconnecting the circuit until the predicted current value is greater than the maximum threshold current value, and then disconnects the circuit where the solid-state circuit breaker is located, enabling the solid-state circuit breakers close to the fault location to disconnect the circuit first, and the branch where the solid-state circuit breaker at the load end is located is not affected.

[0084] According to an exemplary embodiment of the present application, it further includes: obtaining the breaking current value of the solid-state circuit breaker, wherein if the detected current direction is from the power supply end of the solid-state circuit breaker to the load end, then comparing the predicted current value with the breaking current value; and if the predicted current value is greater than the breaking current value, disconnecting the circuit where the solid-state circuit breaker is located by the solid-state circuit breaker.

[0085] As Figure 1 shown, for example, it is detected that the current direction through the solid-state circuit breaker PD-L1 at the load end is from the power supply end of the solid-state circuit breaker PD-L1 to the load end, that is, the forward direction, and the predicted current value is greater than the breaking current value of the solid-state circuit breaker PD-L1, indicating that a fault has occurred at the load end of the solid-state circuit breaker PD-L1, for example, a fault has occurred at F3. Then the load branch where the fault is located should be disconnected from the power grid. Therefore, the solid-state circuit breaker PD-L1 performs the operation of disconnecting the circuit, so that other devices in the power grid are not affected. In this way, when the forward fault current passes through the solid-state circuit breaker at the load end of the power grid bus in the DC power grid, this solid-state circuit breaker, as the solid-state circuit breaker close to the fault location, can preferentially disconnect the circuit.

[0086] According to an exemplary embodiment of the present application, the method for determining the predicted current value for the upcoming next sampling period is the same as above, including obtaining the current value detected within the sampling period of the solid-state circuit breaker and determining the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker according to the detected current value. Predicting the current value of the upcoming current according to the current value already detected by the solid-state circuit breaker enables the solid-state circuit breaker to judge in advance whether to perform the operation of disconnecting the circuit.

[0087] Through the above method of controlling the solid-state circuit breaker according to the present application, by setting a waiting time for the solid-state circuit breaker, the solid-state circuit breaker close to the fault location can be disconnected. After the fault location is isolated from the power grid, other circuits are not affected by the fault or the circuit disconnection, realizing selective protection of the circuit, and avoiding damage to the solid-state circuit breaker itself, reducing the complexity of the circuit system for realizing selective protection and the cable cost.

[0088] According to an embodiment of the present application, there is also provided a device for controlling a solid-state circuit breaker. Figure 4 It is a schematic diagram of a device for controlling a solid-state circuit breaker according to an embodiment of the present application. As Figure 4As shown, the device 4 for controlling a solid-state circuit breaker according to an embodiment of the present application includes: a current direction detection unit 401 configured to detect the direction of the current passing through the solid-state circuit breaker. In an embodiment according to the present application, the solid-state circuit breaker is located at the power supply end of the grid bus in a DC grid. A breaking current value acquisition unit 403 configured to acquire the breaking current value of the solid-state circuit breaker according to the detected direction of the current. A maximum threshold acquisition unit 405 configured to acquire the maximum threshold current value allowed to pass through the solid-state circuit breaker, and the breaking current value is less than the maximum threshold current value. A predicted current value acquisition unit 407 configured to acquire the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker. A comparison unit 409 configured to compare the predicted current value with the breaking current value. And a breaking unit 411 configured to, if the predicted current value is greater than the breaking current value, cause the solid-state circuit breaker to wait until the predicted current value is greater than the maximum threshold current value and then cause the solid-state circuit breaker to disconnect the circuit where the solid-state circuit breaker is located. The device 4 for controlling a solid-state circuit breaker according to an embodiment of the present application executes the method for controlling the solid-state circuit breaker at the power supply end as shown in Figure 2 which will not be elaborated here. According to an embodiment of the present application, a device for controlling a solid-state circuit breaker is provided, and a waiting time is set for the solid-state circuit breaker at the power supply end, so that the solid-state circuit breaker does not immediately perform the operation of disconnecting the circuit when a fault current is detected, and circuit breakers at other positions on the circuit can detect the fault, thereby realizing selective circuit protection for the circuit breaker close to the fault to disconnect the circuit.

[0089] According to another embodiment of the embodiments of the present application, a device for controlling a solid-state circuit breaker is further provided. Figure 5 FIG. is a schematic diagram of a device for controlling a solid-state circuit breaker according to another embodiment of the present application. As shown in Figure 5 FIG., the device 5 for controlling a solid-state circuit breaker according to another embodiment of the present application includes: a current direction detection unit 501 configured to detect the direction of the current passing through the solid-state circuit breaker. In another embodiment according to the present application, the solid-state circuit breaker is located at the load end of the grid bus in a DC grid. A maximum threshold acquisition unit 503 configured to acquire the maximum threshold current value allowed to pass through the solid-state circuit breaker. A predicted current value acquisition unit 505 configured to acquire the predicted current value of the current that will arrive in the next sampling period of the current sampling period of the solid-state circuit breaker. A comparison unit 507 configured to compare the predicted current value with the maximum threshold current value if the detected direction of the current is from the load end of the solid-state circuit breaker to the power supply end. And a breaking unit 509 configured to, if the predicted current value is greater than the maximum threshold current value, cause the solid-state circuit breaker to disconnect the circuit where the solid-state circuit breaker is located. The device 5 for controlling a solid-state circuit breaker according to an embodiment of the present application executes the method as shown in Figure 3The method of controlling the solid-state circuit breaker for the load is not described in detail herein. According to an embodiment of the present application, a device for controlling the solid-state circuit breaker is provided, and a waiting time is set for the solid-state circuit breaker at the load end, so that the solid-state circuit breaker does not immediately perform the operation of disconnecting the circuit when detecting a fault current, and the circuit breakers at other positions on the circuit can detect the fault, thereby realizing the selective circuit protection of disconnecting the circuit by the circuit breaker close to the fault.

[0090] According to an embodiment of the embodiments of the present application, a solid-state circuit breaker is further provided. Figure 6 It is a schematic diagram of a solid-state circuit breaker according to an embodiment of the present application. As Figure 6 shown, the solid-state circuit breaker 6 according to an embodiment of the present application is located at the power supply end of the grid bus in the DC grid, and includes a device 4 for controlling the solid-state circuit breaker as Figure 4 shown.

[0091] Figure 7 It is a schematic diagram of a solid-state circuit breaker according to an exemplary embodiment of the present application. According to the exemplary embodiment of the present application, the solid-state circuit breaker 6 further includes a current-limiting unit 61, which is configured to limit the current increase rate passing through the solid-state circuit breaker 6. The current-limiting unit 61 can be one or more inductors or one or more inductors wound around an iron core, and plays a role in current limiting in the solid-state circuit breaker, avoiding equipment damage caused by an instantaneous increase in current.

[0092] According to another embodiment of the embodiments of the present application, a solid-state circuit breaker is further provided. Figure 8 It is a schematic diagram of a solid-state circuit breaker according to another embodiment of the present application. As Figure 8 shown, the solid-state circuit breaker 7 according to another embodiment of the present application is located at the load end of the grid bus in the DC grid, and includes a device 5 for controlling the solid-state circuit breaker as Figure 5 shown.

[0093] Figure 9 It is a schematic diagram of a solid-state circuit breaker according to an exemplary embodiment of the present application. According to the exemplary embodiment of the present application, the solid-state circuit breaker 7 further includes a current-limiting unit 71, which is configured to limit the current increase rate passing through the solid-state circuit breaker 7. The current-limiting unit 71 can be one or more inductors or one or more inductors wound around an iron core, and plays a role in current limiting in the solid-state circuit breaker, avoiding equipment damage caused by an instantaneous increase in current.

[0094] In the above embodiments of the present application, the descriptions of each embodiment have their own focuses. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0095] Through the forward protection and reverse protection based on the power - end solid - state circuit breaker and the load - end solid - state circuit breaker of the technical solution of this application, the circuit protection device near the fault location disconnects the circuit, and protects the solid - state circuit breaker from being damaged by over - current, reducing the wiring requirements for selective circuit protection and reducing the circuit complexity.

[0096] In several embodiments provided by this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only illustrative. For example, the division of the units or modules is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of modules or units can be in an electrical or other form.

[0097] The units or modules described as separate components may or may not be physically separated. The components displayed as units or modules may or may not be physical units or modules, that is, they can be located in one place, or can be distributed to multiple network units or modules. Some or all of the units or modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0098] In addition, in each embodiment of this application, each functional unit or module can be integrated in a processing unit or module, or each unit or module can exist physically alone, or two or more units or modules can be integrated in one unit or module. The above - mentioned integrated units or modules can be implemented in the form of hardware or in the form of software functional units or modules.

[0099] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer - readable storage medium. Based on this understanding, the essence of the technical solution of this application, or the part that contributes to the prior art, or all or part of this 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 enable a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of this application. And the aforementioned storage medium includes: USB flash drives, read - only memory (ROM), random access memory (RAM), mobile hard disks, magnetic disks or optical discs and other various media that can store program codes.

[0100] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A method for controlling a solid-state circuit breaker, characterized in that: include: detecting a direction of current passing through a solid-state circuit breaker, wherein the solid-state circuit breaker is located at a power supply end of a grid bus in a DC grid; Obtaining a breaking current value of the solid-state circuit breaker according to the direction of the detected current; Acquire a maximum threshold current value allowed to pass through the solid-state circuit breaker, the breaking current value being less than the maximum threshold current value; Obtaining a predicted current value of a current that will arrive in a sampling cycle next to a current sampling cycle of the solid-state circuit breaker; comparing the predicted current value with the breaking current value; and If the predicted current value is greater than the breaking current value, the solid-state circuit breaker is made to wait until the predicted current value is greater than the maximum threshold current value so that the solid-state circuit breaker disconnects the circuit where the solid-state circuit breaker is located.

2. The method according to claim 1, characterized in that Also includes: obtaining a current value detected during a sampling period of the solid-state circuit breaker; A predicted current value of a current that will be reached in a sampling cycle next to a current sampling cycle of the solid-state circuit breaker is determined based on the detected current value.

3. The method according to claim 1 or 2, characterized in that: The direction of the detected current includes a forward direction and a reverse direction, wherein the forward direction refers to the direction from the power supply end to the load end of the solid-state circuit breaker, and the reverse direction refers to the direction from the load end to the power supply end of the solid-state circuit breaker, and, The breaking current value includes a forward breaking current value corresponding to a forward current and a reverse breaking current value corresponding to a reverse current, wherein the forward breaking current value represents the current value of the breaking current of the solid-state circuit breaker when a forward current passes through the solid-state circuit breaker, and the reverse breaking current value represents the current value of the breaking current of the solid-state circuit breaker when a reverse current passes through the solid-state circuit breaker.

4. The method according to claim 3, characterized in that If the direction of the detected current is forward, obtaining the breaking current value of the solid-state circuit breaker includes obtaining the forward breaking current value of the solid-state circuit breaker, and comparing the predicted current value with the breaking current value includes comparing the predicted current value with the forward breaking current value.

5. The method according to claim 3, characterized in that: If the direction of the detected current is reverse, obtaining the breaking current value of the solid-state circuit breaker includes obtaining the reverse breaking current value of the solid-state circuit breaker, and comparing the predicted current value with the breaking current value includes comparing the predicted current value with the reverse breaking current value.

6. A method for controlling a solid-state circuit breaker, characterized in that: include: detecting a direction of current passing through a solid-state circuit breaker, wherein the solid-state circuit breaker is located at a load end of a grid bus in a DC grid; obtaining a maximum threshold current value allowed to pass through the solid-state circuit breaker; Obtaining a predicted current value of a current that will arrive in a sampling cycle next to a current sampling cycle of the solid-state circuit breaker; If the direction of the detected current is from the load end to the power end of the solid-state circuit breaker, comparing the predicted current value with the maximum threshold current value; and If the predicted current value is greater than the maximum threshold current value, the solid-state circuit breaker is disconnected from the circuit where the solid-state circuit breaker is located; further comprising: Obtaining the breaking current value of the solid-state circuit breaker, wherein: If the direction of the detected current is from the power supply end to the load end of the solid-state circuit breaker, comparing the predicted current value with the breaking current value; and If the predicted current value is greater than the breaking current value, the solid-state circuit breaker is enabled to disconnect the circuit where the solid-state circuit breaker is located; The breaking current value is smaller than the maximum threshold current value.

7. The method according to claim 6, characterized in that Also includes: Acquiring a current value detected within a sampling period of the solid-state circuit breaker; A predicted current value of a current that will be reached in a sampling cycle next to a current sampling cycle of the solid-state circuit breaker is determined based on the detected current value.

8. A device for controlling a solid-state circuit breaker, characterized in that include: a current direction detection unit configured to detect a direction of current passing through a solid-state circuit breaker, wherein the solid-state circuit breaker is located at a power supply end of a grid bus in a DC grid; a breaking current value acquisition unit configured to acquire a breaking current value of the solid-state circuit breaker according to the direction of the detected current; a maximum threshold value obtaining unit, configured to obtain a maximum threshold current value allowed to pass through the solid-state circuit breaker, the breaking current value being less than the maximum threshold current value; a predicted current value acquisition unit configured to acquire a predicted current value of a current that will arrive in a sampling cycle next to a current sampling cycle of the solid-state circuit breaker; a comparing unit configured to compare the predicted current value with the breaking current value; and The disconnecting unit is configured to make the solid-state circuit breaker wait if the predicted current value is greater than the disconnecting current value, and disconnect the circuit in which the solid-state circuit breaker is located until the predicted current value is greater than the maximum threshold current value.

9. A device for controlling a solid-state circuit breaker, characterized in that: include: a current direction detection unit configured to detect a direction of current passing through a solid-state circuit breaker, wherein the solid-state circuit breaker is located at a load end of a grid bus in a DC grid; a maximum threshold value obtaining unit configured to obtain a maximum threshold current value allowed to pass through the solid-state circuit breaker; a predicted current value acquisition unit configured to acquire a predicted current value of a current that will arrive in a sampling cycle next to a current sampling cycle of the solid-state circuit breaker; a comparing unit configured to compare the predicted current value with the maximum threshold current value if the direction of the detected current is from the load terminal to the power terminal of the solid-state circuit breaker; and A disconnecting unit is configured to make the solid-state circuit breaker disconnect the circuit where the solid-state circuit breaker is located if the predicted current value is greater than the maximum threshold current value; and further includes: a unit for obtaining a breaking current value of the solid-state circuit breaker; wherein, if the direction of the detected current is from the power supply end to the load end of the solid-state circuit breaker, the predicted current value is compared with the breaking current value; and if the predicted current value is greater than the breaking current value, the solid-state circuit breaker is caused to disconnect the circuit in which the solid-state circuit breaker is located; The breaking current value is smaller than the maximum threshold current value.

10. A solid-state circuit breaker, characterized in that The solid-state circuit breaker is located at the power supply end of the grid bus in the DC grid, and the solid-state circuit breaker includes a device for controlling the solid-state circuit breaker, and the device includes: a current direction detection unit configured to detect a direction of current passing through the solid-state circuit breaker; a breaking current value acquisition unit configured to acquire a breaking current value of the solid-state circuit breaker according to the direction of the detected current; a maximum threshold value obtaining unit, configured to obtain a maximum threshold current value allowed to pass through the solid-state circuit breaker, the breaking current value being less than the maximum threshold current value; a predicted current value acquisition unit configured to acquire a predicted current value of a current that will arrive in a sampling cycle next to a current sampling cycle of the solid-state circuit breaker; a comparing unit configured to compare the predicted current value with the breaking current value; and The disconnecting unit is configured to make the solid-state circuit breaker wait if the predicted current value is greater than the disconnecting current value, and disconnect the circuit in which the solid-state circuit breaker is located until the predicted current value is greater than the maximum threshold current value.

11. The solid-state circuit breaker according to claim 10, characterized in that: The solid-state circuit breaker further comprises: The current limiting unit is configured to limit the current rising speed through the solid-state circuit breaker.

12. A solid-state circuit breaker, characterized in that The solid-state circuit breaker is located at the load end of the grid bus in the DC grid, and the solid-state circuit breaker includes a device for controlling the solid-state circuit breaker, and the device includes: a current direction detection unit configured to detect a direction of current passing through the solid-state circuit breaker; a maximum threshold value obtaining unit configured to obtain a maximum threshold current value allowed to pass through the solid-state circuit breaker; a predicted current value acquisition unit configured to acquire a predicted current value of a current that will arrive in a sampling cycle next to a current sampling cycle of the solid-state circuit breaker; a comparing unit configured to compare the predicted current value with the maximum threshold current value if the direction of the detected current is from the load terminal to the power terminal of the solid-state circuit breaker; and A disconnecting unit is configured to make the solid-state circuit breaker disconnect the circuit where the solid-state circuit breaker is located if the predicted current value is greater than the maximum threshold current value; and further includes: a unit for obtaining a breaking current value of the solid-state circuit breaker; wherein, if the direction of the detected current is from the power supply end to the load end of the solid-state circuit breaker, the predicted current value is compared with the breaking current value; and if the predicted current value is greater than the breaking current value, the solid-state circuit breaker is caused to disconnect the circuit in which the solid-state circuit breaker is located; The breaking current value is smaller than the maximum threshold current value.

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