Direct-current solid-state circuit breaker
By designing consumption modules, switching modules and voltage limiting modules in DC solid-state circuit breakers, the problems of difficulty in selecting energy-consuming devices and high fault current rise rate in the prior art are solved, and higher practicality and reliability are achieved. At the same time, it reduces costs.
Patent Information
- Application Number
- CN202411577479.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-02-14
AI Technical Summary
Existing DC solid-state circuit breakers have difficulties in selecting energy-consuming devices, and the current rise rate is high in the event of short-circuit failure, which increases costs and reduces equipment reliability.
A DC solid-state circuit breaker is designed including a consumption module, a switching module and a voltage limiting module. The consumption module is used to dissipate current energy. The switching module and the consumption module are connected in series to break the fault current. The voltage limiting module and the switching module are used in parallel. to limit voltage.
Through the design of the consumption module, the difficulty of selecting energy-consuming devices is reduced, the practicality of the circuit breaker is improved and the cost is saved. At the same time, the rise rate of the fault current is reduced through the current limiting module, and the reliability of the equipment is enhanced.
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Figure CN119448155A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electrical equipment, and in particular to a DC solid-state circuit breaker. Background Art
[0002] Solid-state DC circuit breakers will generate high voltage spikes during the shutdown process, which has requirements for the withstand voltage and energy consumption of energy-consuming devices. Therefore, it is usually necessary to leave more than twice the margin when selecting energy-consuming devices, resulting in high device costs and difficult selection. Existing DC solid-state circuit breakers include power electronic branches and energy-consuming components, but existing energy-consuming devices include two parts (protective energy-consuming devices and consumption-type energy-consuming devices), so there will be high requirements for the selection of energy-consuming devices. Considering that more than twice the margin must be left, the selection of energy-consuming devices will become very difficult. At the same time, since the traditional topology structure consumes energy only in the energy-consuming devices, the cost of energy-consuming devices will become relatively high.
[0003] If the current rise rate of the existing DC solid-state circuit breaker is very high when a short circuit occurs, then the selection and shutdown capability requirements of the power device will be very high, which will not only increase the cost but also reduce the reliability of the equipment, which will seriously affect the practicality of the DC power distribution system and increase maintenance costs. Summary of the invention
[0004] The main purpose of the present application is to provide a DC solid-state circuit breaker to solve the problem of difficulty in selecting energy-consuming components of DC solid-state circuit breakers in the prior art.
[0005] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a DC solid-state circuit breaker is provided, including: a consumption module, used to dissipate the current energy of the DC solid-state circuit breaker; a switch module, connected in series with the consumption module, used to interrupt the fault current of the DC solid-state circuit breaker; and a voltage limiting module, connected in parallel with the switch module, used to limit the voltage of the DC solid-state circuit breaker.
[0006] Optionally, the DC solid-state circuit breaker also includes a current limiting module, which is connected in parallel with the consumption module and in series with the switch module, and the current limiting module is used to limit the rise of the fault current; wherein, when the current flows in the DC solid-state circuit breaker in a first direction and a fault current is detected, the switch module is closed, and the fault current flows out of the current limiting module and then flows into the voltage limiting module and the consumption module, and the consumption module dissipates the energy of the fault current, and the first direction is the direction in which the normal current flows from the current limiting module to the switch module; or, when the current flows in the DC solid-state circuit breaker in a second direction and a fault current is detected, the switch module is closed, and the fault current flows out of the voltage limiting module and then flows into the current limiting module and the consumption module, and the consumption module dissipates the energy of the fault current, and the second direction is the direction in which the normal current flows from the switch module to the current limiting module.
[0007] Optionally, the consumption module includes a resistance module and a pressure-bearing module, wherein one end of the resistance module is electrically connected to the pressure-bearing module, and the other end of the resistance module is electrically connected to the switch module.
[0008] Optionally, the pressure-bearing module includes a plurality of thyristors, and the plurality of thyristors are electrically connected in parallel.
[0009] Optionally, the switch module includes a first power electronic device, a second power electronic device and a diode bridge, wherein the first power electronic device and the second power electronic device are connected in series, the diode bridge is connected in parallel with the series branch of the first power electronic device and the second power electronic device, and the diode bridge is connected in series with the consumption module.
[0010] Optionally, the power electronic device includes one of the following: IGBT, MOSFET and IGCT.
[0011] Optionally, the diode bridge comprises a first diode and a second diode, the first diode is connected in parallel with the first power electronic device, and the second diode is connected in parallel with the second power electronic device.
[0012] Optionally, an input end of the first diode and an input end of the second diode are electrically connected.
[0013] Optionally, the current limiting module includes an inductor.
[0014] Optionally, the voltage limiting module includes a lightning arrester.
[0015] Using the technical solution of the present application, the DC solid-state circuit breaker includes: a consumption module, a switch module and a voltage limiting module, wherein the consumption module is used to dissipate the current energy of the DC solid-state circuit breaker; the switch module is connected in series with the consumption module to interrupt the fault current of the DC solid-state circuit breaker; the voltage limiting module is connected in parallel with the switch module to limit the voltage of the DC solid-state circuit breaker. By setting the consumption module in the DC solid-state circuit breaker, the current dissipation energy of the DC solid-state circuit breaker is mainly dissipated through the consumption module, which reduces the difficulty of selecting the energy-consuming device of the DC solid-state circuit breaker, improves the practicality of the DC solid-state circuit breaker, and saves costs. The problem of difficulty in selecting the energy-consuming device of the DC solid-state circuit breaker in the prior art is solved. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0017] Figure 1 A structural block diagram of a DC solid-state circuit breaker according to an embodiment of the present application is shown;
[0018] Figure 2 A schematic diagram of a circuit structure of a DC solid-state circuit breaker according to an embodiment of the present application is shown;
[0019] Figure 3 A circuit structure schematic diagram of another DC solid-state circuit breaker according to an embodiment of the present application is shown;
[0020] Figure 4 A circuit structure schematic diagram of another DC solid-state circuit breaker according to an embodiment of the present application is shown;
[0021] Figure 5 A circuit structure schematic diagram of another DC solid-state circuit breaker according to an embodiment of the present application is shown;
[0022] Figure 6 A diagram showing the simulation result of the fault current of a DC solid-state circuit breaker without a current limiting module and a consumption module in the prior art is shown;
[0023] Figure 7 A diagram showing the simulation results of a DC solid-state circuit breaker shutting off a fault current according to an embodiment of the present application is shown.
[0024] The above drawings include the following reference numerals:
[0025] 10. Consumption module; 11. Resistance module; 12. Pressure-bearing module; 20. Switch module; 21. First power electronic device; 22. Second power electronic device; 23. Diode bridge; 30. Voltage limiting module; 40. Current limiting module. DETAILED DESCRIPTION
[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.
[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0028] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.
[0029] As introduced in the background technology, the existing DC solid-state circuit breaker in the prior art includes power electronic branches and energy-consuming components, but the existing energy-consuming devices include two parts (protective energy-consuming devices and energy-consuming devices), so there will be very high requirements for the selection of energy-consuming devices. Considering that more than twice the margin must be left, the selection of energy-consuming devices will become very difficult. At the same time, since the traditional topology structure consumes energy only in the energy-consuming devices, the cost of the energy-consuming devices will become relatively high.
[0030] The DC solid-state circuit breaker provided in the embodiment of the present application is as follows: Figure 1 As shown, the DC solid-state circuit breaker includes: a consumption module 10, used to dissipate the current energy of the DC solid-state circuit breaker; a switch module 20, connected in series with the above-mentioned consumption module 10, used to interrupt the fault current of the above-mentioned DC solid-state circuit breaker; a voltage limiting module 30, connected in parallel with the above-mentioned switch module 20, used to limit the voltage of the above-mentioned DC solid-state circuit breaker.
[0031] The DC solid-state circuit breaker of the present application includes a consumption module, a switch module and a voltage limiting module, wherein the consumption module is used to dissipate the current energy of the DC solid-state circuit breaker; the switch module is connected in series with the consumption module to interrupt the fault current of the DC solid-state circuit breaker; the voltage limiting module is connected in parallel with the switch module to limit the voltage of the DC solid-state circuit breaker. By setting the consumption module in the DC solid-state circuit breaker, the current dissipation energy of the DC solid-state circuit breaker is mainly dissipated through the consumption module, which reduces the difficulty of selecting the energy-consuming device of the DC solid-state circuit breaker, improves the practicality of the DC solid-state circuit breaker, and saves costs. The problem of difficulty in selecting the energy-consuming device of the DC solid-state circuit breaker in the prior art is solved.
[0032] In some optional embodiments, such as Figures 1 to 5 As shown, the DC solid-state circuit breaker further includes a current limiting module 40, which is connected in parallel with the consumption module 10 and in series with the switch module 20, and the current limiting module 40 is used to limit the rise of the fault current; wherein, when the current flows in the DC solid-state circuit breaker in a first direction and a fault current is detected, the switch module 20 is closed, and the fault current flows out of the current limiting module and flows into the voltage limiting module 30 and the consumption module 10, and the consumption module 10 dissipates the energy of the fault current, and the first direction is the direction in which the normal current flows from the current limiting module 40 to the switch module 20; or, when the current flows in the DC solid-state circuit breaker in a second direction and a fault current is detected, the switch module 20 is closed, and the fault current flows out of the voltage limiting module 30 and flows into the current limiting module 40 and the consumption module 10, and the consumption module 10 dissipates the energy of the fault current, and the second direction is the direction in which the normal current flows from the switch module 20 to the current limiting module 40.
[0033] In the above optional implementation, if Figure 1 and Figure 2 As shown, the current limiting module 40 can be a current limiting inductor. When the DC solid-state circuit breaker generates a fault current, when the switch module 20 disconnects the fault current, the current in the current limiting inductor increases, and the current limiting inductor will limit the rising rate of the fault current. A voltage is induced on the current limiting inductor, which absorbs the circuit energy of the DC solid-state circuit breaker while limiting the current. By adding the current limiting inductor, the rising rate of the fault current of the DC solid-state circuit breaker is reduced, and the DC solid-state circuit breaker is better protected.
[0034] When the current of the DC solid-state circuit breaker flows in the first direction, Figure 2As shown, in the normal flow state of the DC solid-state circuit breaker, the current of the DC solid-state circuit breaker flows through the current limiting module 40 and the switch module 20 in sequence, and no current flows through other branches. Figure 3 As shown, when the DC solid-state circuit breaker generates a fault current, when the switch module 20 disconnects the fault current, the current in the current limiting inductor increases, and the current limiting inductor limits the rising rate of the fault current, and a voltage is induced on the current limiting inductor. At this time, an overvoltage is generated at both ends of the voltage limiting module 30 to turn on the voltage limiting module 30, and the fault current flows through the voltage limiting module 30 and the consumption module 10. The fault current is mainly dissipated through the consumption module 10, and the fault current is disconnected.
[0035] When the current of the DC solid-state circuit breaker flows in the second direction, Figure 4 As shown, in the normal flow state of the DC solid-state circuit breaker, the current of the DC solid-state circuit breaker flows through the switch module 20 and the current limiting module 40 in sequence, and no current flows through other modules. Figure 5 As shown, when the DC solid-state circuit breaker generates a fault current, the current in the current-limiting inductor increases, the current-limiting inductor will limit the rate of rise of the fault current, and a voltage will be induced on the current-limiting inductor. The current-limiting inductor will absorb circuit energy while limiting the current. At this time, an overvoltage will be generated at both ends of the voltage-limiting module 30 to turn on the voltage-limiting module 30, and the fault current will flow through the voltage-limiting module 30 and the consumption module 10. The fault current is mainly dissipated by the consumption module 10, and the fault current is interrupted.
[0036] In some optional embodiments, such as Figures 2 to 5 As shown, the consumption module 10 includes a resistance module 11 and a pressure-bearing module 12 , wherein one end of the resistance module 11 is electrically connected to the pressure-bearing module 12 , and the other end is electrically connected to the switch module 20 .
[0037] In the above optional implementation, if Figures 2 to 5 As shown, the resistor module 11 consumes the fault current when the DC solid-state circuit breaker generates the fault current to protect the DC solid-state circuit breaker. The pressure-bearing module 12 bears the high voltage in the DC solid-state circuit breaker after the fault current is generated to ensure that the circuit system of the DC solid-state circuit breaker will not be paralyzed in a short time, providing time for the resistor module 11 to consume energy.
[0038] By adding a current limiting module and a consumption module to the circuit structure of the above-mentioned DC solid-state circuit breaker, the current dissipation energy of the DC solid-state circuit breaker is mainly dissipated through the resistance module, and the MOV only needs a protective MOV but not an energy-consuming MOV, which can reduce the difficulty of selecting the lightning arrester MOV. At the same time, it is cheap. The switch module can realize bidirectional shutdown of the current, which satisfies the requirement of reducing the rising rate of the fault current when a fault current is generated, and at the same time reduces the difficulty of selecting MOV devices.
[0039] In some optional embodiments, such as Figures 2 to 5 As shown, the pressure-bearing module 12 includes a plurality of thyristors, and the plurality of thyristors are electrically connected in parallel.
[0040] In the above optional implementation, if Figures 2 to 5 As shown, the figure shows a schematic diagram of two thyristors in parallel. The pressure-bearing module 12 may also have a plurality of branches in which two thyristor parallel branches are connected in series (not shown in the figure), and those skilled in the art can make reasonable adjustments according to actual conditions. The thyristor may be a bidirectional thyristor (SCR, Silicon Controlled Rectifier), a thyristor (Thyristor) and a controllable diode (GTO, Thyristor, Gate Turn-Off Thyristor), wherein the bidirectional thyristor can control the forward and reverse currents. It is commonly used for DC power supply control and regulation. Thyristors have high withstand voltage and current resistance. Thyristors are commonly used for the control of high-power loads. Controllable diodes can be used for the control and regulation of DC circuits. Other types of thyristors may also be used in DC solid-state circuit breakers, such as fast thyristors (Fast Thyristor), gate-controlled thyristors (MCT, MOS-Controlled Thyristor), limit-controlled thyristors (LCC, Limit Controlled Thyristor), etc. These thyristor types have different performance characteristics and application scenarios, and those skilled in the art can select a suitable type according to specific needs.
[0041] In some optional embodiments, such as Figures 2 to 5 As shown, the switch module 20 includes a first power electronic device 21, a second power electronic device 22 and a diode bridge 23, wherein the first power electronic device 21 and the second power electronic device 22 are connected in series, the diode bridge 23 is connected in parallel with the series branch of the first power electronic device 21 and the second power electronic device 22, and the diode bridge 23 is connected in series with the consumption module 10.
[0042] In the above optional implementation, if Figures 2 to 5As shown, the diode bridge 23 can satisfy the bidirectional breaking function. The above-mentioned first power electronic device 21 and the second power electronic device 22 may include one of the following: an insulated gate bipolar transistor (IGBT), a metal-oxide-semiconductor field-effect transistor (MOSFET), and a fully controlled device integrated gate-commutated thyristor (IGCT). Among them, IGBT has the characteristics of high voltage, high frequency and high power. In a DC solid-state circuit breaker, IGBT can be used to control the switching and regulation of current to protect the circuit from overload and short circuit. MOSFET has the advantages of low switching loss and fast switching speed. In a DC solid-state circuit breaker, MOSFET can be used to control the on-off and regulation of current to protect the normal operation of the circuit. IGCT has the characteristics of fast switching speed, low switching loss and high voltage tolerance. In a DC solid-state circuit breaker, IGCT can be used to achieve efficient current control and protect the circuit from voltage surges and current overloads.
[0043] In some optional embodiments, such as Figures 2 to 5 As shown, the diode bridge 23 includes a first diode and a second diode. The first diode is connected in parallel with the first power electronic device 21 , and the second diode is connected in parallel with the second power electronic device 22 .
[0044] In the above optional implementation, if Figures 2 to 5 As shown, the connection mode of the above-mentioned first diode and the above-mentioned second diode is that the input end of the above-mentioned first diode is electrically connected to the input end of the above-mentioned second diode, and the above-mentioned first diode and the above-mentioned second diode are not connected, so that the above-mentioned diode bridge 23 can meet the bidirectional breaking function. The above-mentioned first diode and the above-mentioned second diode can be fast recovery diodes or rectifier bridge diodes. So that the above-mentioned first diode and the above-mentioned second diode can withstand high voltage and high current, and have a fast recovery time, suitable for use in a circuit breaker. In addition to fast recovery diodes and rectifier bridge diodes, other types of diodes can also be considered, such as Schottky diodes, photo-controlled diodes or switch diodes. Those skilled in the art can select a suitable diode type according to specific application requirements.
[0045] In some optional embodiments, the voltage limiting module includes a lightning arrester.
[0046] In the above optional embodiment, the lightning arrester is a metal oxide arrester (MOV). The energy dissipation resistor can be used as a metal oxide arrester (MOV) to consume energy and protect other components in the circuit from damage by overload current. When the current in the circuit exceeds the maximum current value allowed by the energy dissipation resistor, the energy dissipation resistor will consume the fault current, thereby preventing the components in the circuit from being damaged. In addition to its role in DC solid-state circuit breakers, energy dissipation resistors can also play an important role in other circuits. For example, in a power supply, an energy dissipation resistor can be used to consume overloaded or faulty output current to protect load components in the circuit.
[0047] When the current of the DC solid-state circuit breaker flows in the first direction, Figure 2 As shown, in the normal flow state of the DC solid-state circuit breaker, the current of the DC solid-state circuit breaker flows through the current limiting inductor of the current limiting module 40 and the second power electronic device 22 and the first diode in the switch module 20 in sequence, and no current flows through other branches. Figure 3 As shown, when the DC solid-state circuit breaker generates a fault current, the second power electronic device 22 of the switch module 20 disconnects the fault current, and the current in the current limiting inductor increases. The current limiting inductor will limit the rising rate of the fault current, and a voltage will be induced on the current limiting inductor. At this time, an overvoltage will be generated at both ends of the voltage limiting module 30 (MOV) to turn on the voltage limiting module 30. The fault current flows through the voltage limiting module 30 and the resistance module 11 and the pressure-bearing module 12 of the consumption module 10. The fault current is mainly dissipated through the resistance module 11 to complete the interruption of the fault current.
[0048] When the current of the DC solid-state circuit breaker flows in the second direction, Figure 4 As shown, in the normal flow state of the DC solid-state circuit breaker, the current of the DC solid-state circuit breaker flows through the first power electronic device 21 and the second diode of the switch module 20 and the current limiting inductor of the current limiting module 40 in sequence, and no current flows through other modules at this time. Figure 5 As shown, when the DC solid-state circuit breaker generates a fault current, the current in the current-limiting inductor increases, the current-limiting inductor will limit the rate of rise of the fault current, induce a voltage on the current-limiting inductor, and the current-limiting inductor will absorb circuit energy while limiting the current. After the fault current is limited, the first power electronic device 21 is turned off. At this time, an overvoltage is generated at both ends of the MOV to turn on the arrester MOV, turn on the first thyristor, and the current flows through the MOV branch and the resistor module 11 branch. The fault current is mainly dissipated through the resistor module 11, and the fault is broken.
[0049] Based on the same inventive concept, an embodiment of the present application further provides an electronic device, comprising at least one DC solid-state circuit breaker as mentioned above.
[0050] Figure 6 and Figure 7 The actual simulation results of the circuit breaker are compared in Figure 1. The simulation results are shown in Figure 2, where the horizontal axis is seconds (sec) and the vertical axis is joule (J).
[0051] for Figure 6 It is a simulation result diagram of the fault current of the DC solid-state circuit breaker without the current limiting module and the consumption module in the prior art, where I_MOV is the current flowing through the MOV, I_R is the current flowing through the consumption module, U_R is the voltage across the resistance module, I_ALL is the current flowing through the switch module, U_ALL is the voltage across the switch module, E_MOV is the energy dissipated by the MOV, and E_R is the energy dissipated by the resistance module. Figure 6 It can be seen from the above that the current I_R flowing through the consumption module is 0A, because the consumption module is not connected to the topology structure. It can be seen that the fault current shutdown starts at 0.205s, and the fault current is all dissipated through the metal lightning arrester MOV, and the dissipated energy is 350J.
[0052] for Figure 7 Schematic diagram of the DC solid-state circuit breaker with a current limiting module and a consumption module for shutting off fault current in the present application, wherein I_MOV is the current flowing through the MOV, I_R is the current flowing through the consumption module, U_R is the voltage across the resistance module, I_ALL is the current flowing through the switch module, U_ALL is the voltage across the switch module, E_MOV is the energy dissipated by the MOV, E_R is the energy dissipated by the resistance module, and Figure 7 It can be seen from the above that the fault current shutdown starts at 0.205s, and the large fault current is dissipated by the consumption module, and a small part is dissipated by the metal lightning arrester MOV. The energy dissipated by the consumption module is 500J, and the energy dissipated by the metal lightning arrester MOV is 100J, which reduces the energy dissipation requirements of the metal lightning arrester MOV, reduces the difficulty of MOV selection, and reduces the cost.
[0053] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
[0054] 1) The DC solid-state circuit breaker of the present application includes a consumption module, a switch module and a voltage limiting module, wherein the consumption module is used to dissipate the current energy of the DC solid-state circuit breaker; the switch module is connected in series with the consumption module to interrupt the fault current of the DC solid-state circuit breaker; the voltage limiting module is connected in parallel with the switch module to limit the voltage of the DC solid-state circuit breaker. By setting the consumption module in the DC solid-state circuit breaker, the current dissipation energy of the DC solid-state circuit breaker is mainly dissipated through the consumption module, which reduces the difficulty of selecting the energy dissipation device of the DC solid-state circuit breaker, improves the practicality of the DC solid-state circuit breaker, and saves costs. The problem of difficulty in selecting the energy dissipation device of the DC solid-state circuit breaker in the prior art is solved.
[0055] 2) In the circuit structure of the DC solid-state circuit breaker of the present application, a current-limiting inductor is added to reduce the fault current rise rate of the DC solid-state circuit breaker, thereby better protecting the DC solid-state circuit breaker.
[0056] 3) This application adds a current limiting module and a consumption module to the circuit structure of the above-mentioned DC solid-state circuit breaker, so that the current dissipation energy of the DC solid-state circuit breaker is mainly dissipated through the resistance module, and the MOV only needs a protective MOV instead of an energy-consuming MOV, which can reduce the difficulty of selecting the arrester MOV, and at the same time, it is cheap. The switch module can realize the bidirectional shutdown of the current, which satisfies the requirement of reducing the rising rate of the fault current when the fault current is generated, and at the same time reduces the difficulty of selecting the MOV device. In addition, the circuit structure of the above-mentioned DC solid-state circuit breaker is simple and reliable, and it is suitable for the complex working conditions of the DC power distribution system.
[0057] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0058] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.
Claims
1. A DC solid-state circuit breaker, characterized in that: include: a consumption module for dissipating current energy of a DC solid-state circuit breaker; A switch module is connected in series with the consumption module and is used to interrupt the fault current of the DC solid-state circuit breaker; a voltage limiting module is connected in parallel with the switch module and is used to limit the voltage of the DC solid-state circuit breaker.
2. The DC solid-state circuit breaker according to claim 1, characterized in that: The DC solid-state circuit breaker further comprises a current limiting module, which is connected in parallel with the consumption module and in series with the switch module, and is used to limit the rise of the fault current; Wherein, when the current flows in the DC solid-state circuit breaker in a first direction and a fault current is detected, the switch module is closed, and the fault current flows out of the current limiting module and then flows into the voltage limiting module and the consumption module, and the consumption module dissipates the energy of the fault current, and the first direction is the direction in which the normal current flows from the current limiting module to the switch module; or, When the current flows in the second direction in the DC solid-state circuit breaker and a fault current is detected, the switch module is closed, and the fault current flows out of the voltage limiting module and then flows into the current limiting module and the consumption module. The consumption module dissipates the energy of the fault current. The second direction is the direction in which the normal current flows from the switch module to the current limiting module.
3. The DC solid-state circuit breaker according to claim 1, characterized in that: The consumption module includes a resistance module and a pressure-bearing module, wherein one end of the resistance module is electrically connected to the pressure-bearing module, and the other end of the resistance module is electrically connected to the switch module.
4. The DC solid-state circuit breaker according to claim 3, characterized in that: The pressure-bearing module includes a plurality of thyristors, and the plurality of thyristors are electrically connected in parallel.
5. The DC solid-state circuit breaker according to claim 1, characterized in that: The switch module includes a first power electronic device, a second power electronic device and a diode bridge, wherein the first power electronic device and the second power electronic device are connected in series, the diode bridge is connected in parallel to the series branch of the first power electronic device and the second power electronic device, and the diode bridge is connected in series with the consumption module.
6. The DC solid-state circuit breaker according to claim 5, characterized in that: The power electronic device includes one of the following: IGBT, MOSFET and IGCT.
7. The DC solid-state circuit breaker according to claim 5, characterized in that: The diode bridge includes a first diode and a second diode, wherein the first diode is connected in parallel with the first power electronic device, and the second diode is connected in parallel with the second power electronic device.
8. The DC solid-state circuit breaker according to claim 7, characterized in that: An input end of the first diode and an input end of the second diode are electrically connected.
9. The DC solid-state circuit breaker according to claim 2, characterized in that: The current limiting module includes an inductor.
10. The DC solid-state circuit breaker according to claim 1, characterized in that: The voltage limiting module includes a lightning arrester.
Citation Information
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