Solid state dc circuit breaker based on three-winding coupled inductors and control method thereof

Abstract

The application relates to the technical field of circuit breakers and discloses a solid-state direct-current circuit breaker based on three-winding coupled inductors and a control method thereof. The solid-state direct-current circuit breaker is connected by an energy consumption branch, a through-flow branch, a left charging branch, a right charging branch, a capacitor branch, a capacitor charging resistor branch, a first coupled inductor branch and a second coupled inductor branch, directly obtains power from a system line through the charging branch and the capacitor charging resistor branch, and does not need to be configured with an additional charging power supply, so that the operation difficulty and the maintenance cost are reduced. Through reasonable design of the circuit, the problem of unreliable breaking caused by fault distance and unknown parameters can be effectively avoided, the conduction impedance path in the through-flow branch is reduced, the operation energy consumption is reduced, the efficiency of the system is improved, the charging loop of the capacitor is not affected after the current breaking is completed, the capacitor can quickly return to the initial state, and the adaptability and operation safety of the system under complex working conditions are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breakers, in particular to a solid-state DC circuit breaker based on three-winding coupled inductors and a control method thereof. BACKGROUND

[0002] In a DC power system, system protection is the core link to ensure its safety and reliability. Especially in modern application scenarios such as energy storage devices, photovoltaic power generation, wind power generation, and electric vehicle charging stations, DC system protection is particularly important.

[0003] Compared with traditional AC systems, the dynamic characteristics of short-circuit faults in DC systems have significant differences, specifically manifested in faster rising speed and larger amplitude of short-circuit current. This characteristic not only poses a severe threat to the DC system itself, but also can damage key devices within the system, leading to overall system instability. Therefore, a fast and effective DC protection mechanism becomes an important technical problem in the design of DC power systems.

[0004] As the core device of DC system protection, a DC circuit breaker can quickly and accurately detect and break the fault current when a fault occurs, preventing further expansion of the fault. This function not only effectively avoids overcurrent damage to devices, but also enhances the stability and reliability of the system, thereby improving the overall operating efficiency of the power system. Therefore, DC circuit breakers have become one of the research hotspots in the field of power engineering in recent years and have attracted widespread attention and in-depth exploration.

[0005] Among them, solid-state DC circuit breakers have attracted much attention due to their design based on solid-state switching devices. Compared with traditional mechanical circuit breaker solutions, solid-state DC circuit breakers have significant advantages in breaking speed and operation precision, especially suitable for high demand for fast protection in DC systems. Further analysis shows that, compared with fully controlled switching devices, semi-controlled devices such as thyristors have many advantages in solid-state DC circuit breakers, including low on-resistance, mature manufacturing process, lower procurement cost, and excellent surge current bearing capacity. These advantages have led to significant development of DC circuit breaker topologies based on thyristors in recent years, attracting widespread attention in academia and industry.

[0006] However, existing solid-state DC circuit breaker designs based on thyristors still have the following limitations and challenges:

[0007] 1) Lack of control: passive thyristor-type solid-state DC circuit breakers can only act passively after a fault occurs, and cannot actively break the current during normal system operation, thereby limiting their application potential in precise control.

[0008] 2) Risk of false triggering: due to load changes, line current fluctuations may occur, which in some cases resemble fault characteristics, potentially triggering false actions of passive solutions, leading to system false shutdown and affecting power supply reliability.

[0009] 3) Increased current stress: during fault current interruption, external line current continues to rise, causing other power electronic devices in the DC system to face higher current stress, potentially shortening device life.

[0010] 4) Low efficiency: operating current usually needs to pass through multiple power electronic devices in the through-flow branch, which have high on-resistance, resulting in high energy loss and affecting system efficiency.

[0011] 5) Lack of reclosing function: after the first fault interruption, reclosing operation is usually required to determine whether the fault still exists. However, some existing designs lack reliable reclosing protection functions, limiting their actual application scenarios.

[0012] 6) Insufficient shutdown process reliability: the shutdown circuit of thyristor usually relies on external circuit parameters, which may lead to reduced reliability during current interruption, especially in the case of parameter deviation or environmental condition changes. SUMMARY

[0013] Therefore, the present application provides a solid-state DC circuit breaker based on three-winding coupled inductors and a control method thereof to solve the above technical problems.

[0014] The first aspect of the present application provides a solid-state DC circuit breaker based on three-winding coupled inductors, comprising: an energy consumption branch 10, a through-flow branch 20, a left side charging branch 31, a right side charging branch 32, a capacitor branch 40, a capacitor charging resistance branch 50, a first coupled inductor branch 60, and a second coupled inductor branch 70.

[0015] The energy consumption branch 10 is connected in parallel with the through-flow branch 20.

[0016] The through-flow branch 20 is electrically connected to the left side charging branch 31 and the right side charging branch 32 at both ends.

[0017] The left side charging branch 31 and the right side charging branch 32 are connected to the first coupled inductor branch 60 and the second coupled inductor branch 70, respectively, away from the through-flow branch 20.

[0018] The first coupled inductor branch 60, the second coupled inductor branch 70, and the capacitor branch 40 are connected in parallel.

[0019] The first end of the capacitor charging resistor branch 50 is electrically connected with the first coupling inductor branch 60, the second coupling inductor branch 70 and the capacitor branch 40 respectively, and the second end of the capacitor charging resistor branch 50 is grounded.

[0020] Preferably, the energy consumption branch 10 comprises a lightning arrester M m .

[0021] Preferably, the through-flow branch 20 comprises a thyristor T1, a thyristor T2 and a tertiary side winding N3.

[0022] The thyristor T1 and the thyristor T2 are connected in anti-parallel.

[0023] The thyristor T1 is connected with the tertiary side winding N3.

[0024] Preferably, the left side charging branch 31 comprises a diode D L , the anode of the diode D L is electrically connected with the through-flow branch 20, and the cathode of the diode D L is electrically connected with the first coupling inductor branch 60.

[0025] Preferably, the right side charging branch 32 comprises a diode D R , the anode of the diode D R is electrically connected with the through-flow branch 20, and the cathode of the diode D R is electrically connected with the cathode of the diode D L and the second coupling inductor branch 70 respectively.

[0026] Preferably, the capacitor branch 40 comprises a capacitor C, a diode D C and a lightning arrester M C .

[0027] The first end of the capacitor C is connected to the connection point of the left side charging branch 31 and the right side charging branch 32, and the second end of the capacitor C is connected to the first end of the capacitor charging resistor branch 50.

[0028] The anode of the diode D C is electrically connected with the first end of the lightning arrester M C , and the cathode of the diode D C is connected to the connection point of the left side charging branch 31 and the right side charging branch 32.

[0029] The second end of the lightning arrester M C is connected to the connection point of the capacitor C and the capacitor charging resistor branch 50.

[0030] Preferably, the capacitor charging resistance branch 50 comprises a resistance R C ; a first end of the resistance R C is electrically connected with the first coupled inductor branch 60, the second coupled inductor branch 70 and the capacitor branch 40 respectively, and a second end of the resistance R C is grounded.

[0031] Preferably, the first coupled inductor branch 60 comprises a primary winding N1 and a thyristor T N1 ;

[0032] A first end of the primary winding N1 is electrically connected with the left charging branch 31, and a second end of the primary winding N1 is connected with an anode of the thyristor T N1 ;

[0033] A cathode of the thyristor T N1 is connected to a connection point of the capacitor branch 40 and the capacitor charging resistance branch 50.

[0034] Preferably, the second coupled inductor branch 70 comprises a secondary winding N2 and a thyristor T N2 ;

[0035] A first end of the secondary winding N2 is electrically connected with the right charging branch 32, and a second end of the secondary winding N2 is connected with an anode of the thyristor T N2 ;

[0036] A cathode of the thyristor T N2 is connected to a connection point of the capacitor branch 40 and the capacitor charging resistance branch 50.

[0037] In a second aspect, the application further provides a control method of the three-winding coupled inductor based solid-state DC circuit breaker as described in the first aspect, comprising the following steps:

[0038] When the branch to be charged is fully charged through the left charging branch or the right charging branch, it is determined whether the DC system starts to start up;

[0039] When it is determined that the DC system starts to start up, a conducting signal is generated and sent to the through-flow branch, and it is determined whether the current of the through-flow branch in normal operation is zero-crossed;

[0040] When it is determined that the current of the through-flow branch in normal operation is not zero-crossed, it is determined whether the through-flow branch receives a current breaking signal of the DC system; when it is determined that the current of the through-flow branch in normal operation is zero-crossed, the step of generating a conducting signal and sending it to the through-flow branch, and determining whether the current of the through-flow branch in normal operation is zero-crossed is turned to;

[0041] When it is judged that the through-flow branch does not receive the current breaking signal of the DC system, the process goes to the step of judging whether the current of the through-flow branch is zero when the through-flow branch is in normal operation;

[0042] When it is judged that the through-flow branch receives the current breaking signal of the DC system, it is judged whether the current direction of the through-flow branch is from the left charging branch direction to the right charging branch direction;

[0043] When it is judged that the current direction of the through-flow branch is from the left charging branch direction to the right charging branch direction, the first coupled inductor branch is turned on;

[0044] When it is judged that the current direction of the through-flow branch is not from the left charging branch direction to the right charging branch direction, the second coupled inductor branch is turned on;

[0045] It is judged whether the DC system needs to be reclosed;

[0046] When it is judged that the DC system needs to be reclosed, the process goes to the step of judging whether the DC system starts to start when the to-be-charged branch is fully charged through the left charging branch or the right charging branch;

[0047] When it is judged that the DC system does not need to be reclosed, the process ends.

[0048] From the above technical solution, it can be seen that the embodiments of the present application can directly take power from the system line through the charging branch and the capacitor charging resistance branch through the connection relationship of the energy consumption branch, the through-flow branch, the left charging branch, the right charging branch, the capacitor branch, the first coupled inductor branch and the second coupled inductor branch, without the need to configure an additional charging power supply, not only reducing the hardware cost of the system, but also simplifying the installation and debugging process, thereby reducing the operation difficulty and maintenance cost. Through the reasonable design of the circuit, the problem of unreliable breaking caused by fault distance and unknown parameters can be effectively avoided, the reliability of the fault current breaking is significantly improved, the conduction impedance path in the through-flow branch is reduced, the operation energy consumption is reduced, the efficiency of the system is improved, and after the current breaking ends, the charging circuit of the capacitor is not affected, and the system can quickly recover to the initial state, thereby enhancing the adaptability and operation safety of the system under complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0050] Figure 1 A structural schematic diagram of a solid-state DC circuit breaker based on three-winding coupled inductors is provided for an embodiment of the present application.

[0051] Figure 2 A flow chart of a control method of a solid-state DC circuit breaker based on three-winding coupled inductors is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] As shown in Figure 1 The present application provides a solid-state DC circuit breaker based on three-winding coupled inductors, which comprises an energy consumption branch 10, a through-flow branch 20, a left charging branch 31, a right charging branch 32, a capacitor branch 40, a capacitor charging resistor branch 50, a first coupled inductor branch 60 and a second coupled inductor branch 70.

[0054] The energy consumption branch 10 is connected in parallel with the through-flow branch 20.

[0055] The through-flow branch 20 is electrically connected with the left charging branch 31 and the right charging branch 32 at two ends thereof.

[0056] The left charging branch 31 and the right charging branch 32 are connected with the first coupled inductor branch 60 and the second coupled inductor branch 70 at ends thereof away from the through-flow branch 20.

[0057] The first coupled inductor branch 60, the second coupled inductor branch 70 and the capacitor branch 40 are connected in parallel.

[0058] The capacitor charging resistor branch 50 is electrically connected with the first coupled inductor branch 60, the second coupled inductor branch 70 and the capacitor branch 40 at a first end thereof, and the second end of the capacitor charging resistor branch 50 is grounded.

[0059] It should be noted that, through the connection relationship of the energy consumption branch, the through-flow branch, the left side charging branch, the right side charging branch, the capacitor branch, the capacitor charging resistor branch, the first coupled inductor branch and the second coupled inductor branch, the charging branch and the capacitor charging resistor branch directly take power from the system circuit, without the need to configure an additional charging power supply, not only reducing the hardware cost of the system, but also simplifying the installation and debugging process, thereby reducing the operation difficulty and maintenance cost. Through the reasonable design of the circuit, the problem of unreliable opening caused by fault distance and unknown parameters can be effectively avoided, the reliability of the fault current opening is significantly improved, the conduction impedance path in the through-flow branch is reduced, the operation energy consumption is reduced, the efficiency of the system is improved, and after the current opening is completed, the charging circuit of the capacitor is not affected, and the system can quickly recover to the initial state, thereby enhancing the adaptability and operation safety of the system under complex working conditions.

[0060] In some embodiments, the energy consumption branch 10 comprises a lightning arrester M m .

[0061] In some embodiments, the through-flow branch comprises a thyristor T1, a thyristor T2 and a tertiary winding N3.

[0062] The thyristor T1 and the thyristor T2 are connected in anti-parallel.

[0063] The thyristor T1 is connected with the tertiary winding N3.

[0064] Wherein, the through-flow branch is located at the positive pole of the direct current system, one side is the left side, and the other side is the right side, from left to right, through the anti-parallel thyristor T1 and the thyristor T2 and the coupled inductor tertiary winding N3 in turn, wherein, the a3 end of the tertiary winding N3 is connected first, and then the b3 end of the tertiary winding N3 is connected.

[0065] In some embodiments, the left side charging branch comprises a diode D L , the anode of the diode D L is electrically connected with the through-flow branch, and the cathode of the diode D L is electrically connected with the first coupled inductor branch.

[0066] In some embodiments, the right side charging branch comprises a diode D R , the anode of the diode D R is electrically connected with the through-flow branch, and the cathode of the diode D R is electrically connected with the cathode of the diode D L and the second coupled inductor branch respectively.

[0067] In some embodiments, the capacitor branch comprises a capacitor C, a diode D C and a lightning arrester M C .

[0068] The first end of capacitor C is connected to the connection point of the left charging branch and the right charging branch, and the second end of capacitor C is connected to the first end of the capacitor charging resistor branch.

[0069] Diode D C The anode and surge arrester M C The first terminal is electrically connected to diode D. C The cathode is connected to the connection point of the left charging branch and the right charging branch;

[0070] Surge arrester M C The second end is connected to the connection point of capacitor C and capacitor charging resistor branch.

[0071] In some embodiments, the capacitor charging resistor branch includes a resistor R. C Resistance R C The first terminal is electrically connected to the first coupled inductor branch, the second coupled inductor branch, and the capacitor branch, respectively, and the resistor R C The second terminal is grounded.

[0072] In some embodiments, the first coupled inductor branch includes a primary winding N1 and a thyristor T. N1 ;

[0073] The first terminal of the primary winding N1 is electrically connected to the left charging branch, and the second terminal of the primary winding N1 is connected to the thyristor T. N1 Anode connection;

[0074] Thyristor T N1 The cathode is connected to the connection point of the capacitor branch and the capacitor charging resistor branch.

[0075] In some embodiments, the second coupled inductor branch includes a secondary winding N2 and a thyristor T. N2 ;

[0076] The first end of the secondary winding N2 is electrically connected to the right charging branch, and the second end of the secondary winding N2 is connected to the thyristor T. N2 Anode connection;

[0077] Thyristor T N2 The cathode is connected to the connection point of the capacitor branch and the capacitor charging resistor branch.

[0078] It should be noted that in the above embodiments, winding N 1~3 a 1~3 For the same terminal, and simultaneously winding N 1~3 b 1~3 It is a terminal with the same name.

[0079] It is understood that the circuit design of the solid-state DC circuit breaker based on a three-winding coupled inductor provided in the embodiments of this application has the following advantages.

[0080] 1) Significant cost advantage: The invention uses a low-cost semi-controlled device thyristor as the core switching element, which significantly reduces the overall manufacturing cost of the system compared to traditional DC circuit breaker solutions based on fully controlled switching devices. While ensuring performance, this design improves the economy of the scheme, providing feasibility and market competitiveness for the large-scale popularization and application of DC circuit breakers.

[0081] 2) No need for additional charging power supply: The invention directly takes power from the line through the left / right side charging branch and the capacitor charging resistance branch, without the need for an additional independent charging power supply. This design effectively simplifies the system structure and reduces the need for additional hardware, further reducing material costs. At the same time, this design significantly reduces the complexity of installation and debugging, simplifies the operation process, and significantly improves the ease of use and maintenance convenience of the system.

[0082] 3) High breaking reliability: When a fault occurs, the diode in the left / right side charging branch has a one-way conduction characteristic, so the capacitor C will not release energy through the fault point, and its voltage remains stable throughout the fault handling process. This feature effectively avoids the adverse effects of capacitor voltage fluctuations, ensuring the sustained stability of the capacitor state, thereby significantly improving the reliability and repeatability of the breaking process, even in complex working conditions, and reliably completing fault isolation and protection operations.

[0083] 4) High efficiency operation: In the normal operating state of the system, the current only needs to pass through a single thyristor and winding N3, rather than the path of multiple switching devices in traditional designs. This design significantly reduces the conduction resistance path, fundamentally reducing power loss and significantly improving operating efficiency. Moreover, this optimized solution enhances the long-term performance stability of the system while reducing operating energy consumption, providing an effective solution for building energy-efficient DC power systems.

[0084] 5) Support for reclosing protection: Whether the fault occurs on the left or right side, the capacitor can quickly return to its initial state after the fault handling is complete, providing the necessary energy reserve for subsequent reclosing operations. This design enables the invention to have strong fault breaking capability while supporting repetitive protection functions, significantly expanding the applicability of application scenarios and significantly improving the operating safety and stability of the DC system.

[0085] As Figure 2 shown, the application embodiment also provides a control method for a solid-state DC circuit breaker based on a three-winding coupled inductor as in the above embodiment, comprising the following steps:

[0086] Step S1, when the to-be-charged branch is fully charged through the left or right charging branch, it is determined whether the DC system starts to start.

[0087] Wherein, the to-be-charged branch is charged through the line-left / right charging branch-capacitance branch-capacitance charging resistance branch-ground.

[0088] Step S2, when it is determined that the DC system starts to start, a conduction signal is generated and sent to the through-flow branch, and it is determined whether the current of the through-flow branch in normal operation is zero-crossed.

[0089] Wherein, when it is determined that the DC system does not start to start, it is turned to step S1. When it is determined that the DC system starts to start, a conduction signal is generated and sent to the thyristor T1 and the thyristor T2 in the through-flow branch to conduct.

[0090] Step S3, when it is determined that the current of the through-flow branch in normal operation is not zero-crossed, it is determined whether the through-flow branch receives the current breaking signal of the DC system; when it is determined that the current of the through-flow branch in normal operation is zero-crossed, it is turned to the step of generating a conduction signal and sending it to the through-flow branch, and determining whether the current of the through-flow branch in normal operation is zero-crossed.

[0091] Step S4, when it is determined that the through-flow branch does not receive the current breaking signal of the DC system, it is turned to the step of determining whether the current of the through-flow branch in normal operation is zero-crossed.

[0092] Step S5, when it is determined that the through-flow branch receives the current breaking signal of the DC system, it is determined whether the current flow direction of the through-flow branch is from the left charging branch direction to the right charging branch direction.

[0093] Step S6, when it is determined that the current flow direction of the through-flow branch is from the left charging branch direction to the right charging branch direction, the first coupled inductor branch is turned on.

[0094] Step S7, when it is determined that the current flow direction of the through-flow branch is not from the left charging branch direction to the right charging branch direction, the second coupled inductor branch is turned on.

[0095] Step S8, it is determined whether the DC system needs to be reclosed.

[0096] Step S9, when it is determined that the DC system needs to be reclosed, it is turned to the step of determining whether the DC system starts to start when the to-be-charged branch is fully charged through the left or right charging branch.

[0097] Step S10, when it is determined that the DC system does not need to be reclosed, the process is ended.

[0098] It should be noted that steps S1-S7 are the system starting and current breaking process, if reclosing is needed, i.e. step S8 is entered.

[0099] In the embodiments of the present application, it is necessary to ensure that the reverse recovery process of each thyristor is long enough through reasonable parameter design, so as to realize reliable turn-off function.

[0100] In the embodiments of the present application, through the design of the coupling inductor, it is ensured that the stress generated in the circuit breaker is kept within a controllable range, thereby avoiding excessive electrical stress on the equipment and ensuring the stability and reliability of the system.

[0101] In the embodiments of the present application, through the current bearing capacity of each device, especially in the case of current surge, it is ensured that the device can withstand sudden current fluctuation, avoiding damage or failure of the device caused by surge current.

[0102] The embodiments of the present application also provide a control method of a solid-state DC circuit breaker based on a three-winding coupling inductor. Different from the passive scheme triggered by the fault itself, the embodiments of the present application adopt an active control strategy, which can actively break the current during system operation without relying on the occurrence of the fault itself. This active control method enables the circuit breaker to accurately respond according to the real-time detected operating conditions, thereby significantly improving the flexibility and reliability of control. Compared with the passive scheme, the control of the present application is more powerful, which can effectively avoid damage to the equipment caused by fault expansion or current impact, and ensure the stability and safety of the system.

[0103] The embodiments of the present application can accurately judge the current change during load switching and system current fluctuation, and will not be mis-triggered due to the fluctuation or waveform characteristics of the current similar to the fault. This feature enables the present application to adapt to more complex working conditions, avoid misoperation or unnecessary action, and thus ensures the stable operation of the system in different working environments. Compared with the traditional scheme triggered by the fault itself, the present application has higher robustness and reliability when facing system dynamic changes.

[0104] In the design of the embodiments of the present application, the combined action of the coupling inductor and the charging capacitor causes the surge arrester in the energy consumption branch to act in time to clamp the voltage across the circuit breaker to a level higher than the system voltage after successful operation. This process effectively and quickly suppresses the rise of the line current, avoids the expansion of the overcurrent, and thus reduces the damage of the fault to the DC system. Through this design, the system not only can quickly respond when a fault occurs, but also can provide stronger protection capability, thereby ensuring the stability and safety of the DC system under various fault situations.

[0105] In the embodiments of the present application, a unified control method is adopted when breaking the operating current or fault current, that is, the thyristors in the coupled inductance branch are turned on to control. This design simplifies the control steps, makes the operation process of the entire circuit breaker more simple and intuitive, and reduces the complexity and potential error probability in the operation process. Due to the consistency of the control method, in the embodiments of the present application, the stability and efficiency of the breaking process can be ensured under various operating conditions.

[0106] In the embodiments of the present application, the thyristor turn-off process in the through-flow branch is independent of the external circuit and completes the current breaking task independently. Since the turn-off process does not depend on the external circuit parameters, the reliability of the current breaking can be ensured, and the breaking failure problem caused by the change of the external circuit can be avoided. This design improves the autonomy and stability of the circuit breaker, enabling it to effectively perform breaking operations in complex electrical environments, thereby improving the overall reliability and safety of the DC system.

[0107] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0108] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A solid-state DC circuit breaker based on a three-winding coupled inductor, characterized in that, include: Energy consumption branch (10), current flow branch (20), left charging branch (31), right charging branch (32), capacitor branch (40), capacitor charging resistor branch (50), first coupling inductor branch (60), and second coupling inductor branch (70). The energy consumption branch (10) is connected in parallel with the flow branch (20); The two ends of the current-carrying branch (20) are electrically connected to the left charging branch (31) and the right charging branch (32) respectively; The end of the left charging branch (31) away from the current-carrying branch (20) and the end of the right charging branch (32) away from the current-carrying branch (20) are respectively connected to the first coupling inductor branch (60) and the second coupling inductor branch (70); The first coupled inductor branch (60), the second coupled inductor branch (70), and the capacitor branch (40) are connected in parallel; The first end of the capacitor charging resistor branch (50) is electrically connected to the first coupling inductor branch (60), the second coupling inductor branch (70) and the capacitor branch (40) respectively, and the second end of the capacitor charging resistor branch (50) is grounded. The current-carrying branch (20) includes a thyristor (T1), a thyristor (T2), and a tertiary winding (N3). The thyristor (T1) and the thyristor (T2) are connected in parallel in reverse. The thyristor (T1) is connected to the third-side winding (N3).

2. The solid-state DC circuit breaker based on a three-winding coupled inductor according to claim 1, characterized in that, The energy consumption branch (10) includes a surge arrester (M m ).

3. The solid-state DC circuit breaker based on a three-winding coupled inductor according to claim 1, characterized in that, The left charging branch (31) includes a diode (D L The diode (D) L The anode of the diode (D) is electrically connected to the current-carrying branch (20), and the diode (D) L The cathode of the first coupled inductor branch (60) is electrically connected to the cathode of the first coupled inductor branch (60).

4. The solid-state DC circuit breaker based on a three-winding coupled inductor according to claim 3, characterized in that, The right-side charging branch (32) includes a diode (D R The diode (D) R The anode of the diode (D) is electrically connected to the current-carrying branch (20), and the diode (D) R The cathodes of the diodes are respectively connected to the cathodes of the diodes. L The cathode of the second coupled inductor branch (70) is electrically connected to the cathode of the second coupled inductor branch (70).

5. The solid-state DC circuit breaker based on a three-winding coupled inductor according to claim 1, characterized in that, The capacitor branch (40) includes a capacitor (C) and a diode (D). C ) and surge arrester (M) C ); The first end of the capacitor (C) is connected to the connection point of the left charging branch (31) and the right charging branch (32), and the second end of the capacitor (C) is connected to the first end of the capacitor charging resistor branch (50). The diode (D) C The anode of the surge arrester (M) and the surge arrester (M) C The first terminal of the diode (D) is electrically connected. C The cathode of the charging branch (31) is connected to the connection point of the left charging branch (31) and the right charging branch (32); The surge arrester (M) C The second end of the capacitor is connected to the connection point of the capacitor (C) and the capacitor charging resistor branch (50).

6. The solid-state DC circuit breaker based on a three-winding coupled inductor according to claim 1 or 5, characterized in that, The capacitor charging resistor branch (50) includes a resistor (R) C The resistor (R) C The first end of the resistor (R) is electrically connected to the first coupled inductor branch (60), the second coupled inductor branch (70), and the capacitor branch (40), respectively. C The second end of the device is grounded.

7. The solid-state DC circuit breaker based on a three-winding coupled inductor according to claim 1, characterized in that, The first coupled inductor branch (60) includes a primary winding (N1) and a thyristor (T). N1 ); The first end of the primary winding (N1) is electrically connected to the left charging branch (31), and the second end of the primary winding (N1) is connected to the thyristor (T). N1 Anode connection; The thyristor (T) N1 The cathode of the capacitor is connected to the connection point of the capacitor branch (40) and the capacitor charging resistor branch (50).

8. The solid-state DC circuit breaker based on a three-winding coupled inductor according to claim 1, characterized in that, The second coupled inductor branch (70) includes a secondary winding (N2) and a thyristor (T). N2 ); The first end of the secondary winding (N2) is electrically connected to the right charging branch (32), and the second end of the secondary winding (N2) is connected to the thyristor (T N2 Anode connection; The thyristor (T) N2 The cathode of the capacitor is connected to the connection point of the capacitor branch (40) and the capacitor charging resistor branch (50).

9. A control method for a solid-state DC circuit breaker based on a three-winding coupled inductor as described in any one of claims 1 to 8, characterized in that, Includes the following steps: Once the charging branch is fully charged via the left or right charging branch, determine whether the DC system should start. When it is determined that the DC system has started up, a conduction signal is generated and sent to the current-carrying branch, and it is determined whether the current of the current-carrying branch has crossed zero during normal operation. If it is determined that the current of the current-carrying branch is not zero during normal operation, then it is determined whether the current-carrying branch has received a current interruption signal from the DC system. When it is determined that the current of the current-carrying branch crosses zero during normal operation, the process proceeds to the step of generating a conduction signal and sending it to the current-carrying branch, and determining whether the current of the current-carrying branch crosses zero during normal operation. When it is determined that the current-carrying branch has not received the current interruption signal from the DC system, the process proceeds to the step of determining whether the current of the current-carrying branch is zero during normal operation. When it is determined that the current-carrying branch receives the current interruption signal from the DC system, it is then determined whether the current flow direction of the current-carrying branch is from the left charging branch direction to the right charging branch direction. When it is determined that the current flow direction of the current-carrying branch is from the left charging branch to the right charging branch, the first coupled inductor branch is turned on. If it is determined that the current flow direction of the current-carrying branch is not from the left charging branch to the right charging branch, then the second coupled inductor branch is turned on. Determine whether the DC system requires reclosing; When it is determined that the DC system needs to be reclosed, the process proceeds to the step of determining whether the DC system should start up after the charging branch is fully charged via the left or right charging branch. If it is determined that the DC system does not require reclosing, the process ends.

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