46 results about "Fault current limiting" patented technology

The invention discloses a converter collaborative current limiting method based on adaptive virtual impedance and a power loop, and the method comprises the steps: firstly building an equivalent impedance model of a converter and a power grid, analyzing the steady-state and transient characteristics of fault current, and extracting key parameters for current limiting design; when it is detected that the voltage drop of the grid-connected point exceeds a threshold value, a self-adaptive virtual impedance link is automatically put into use, and virtual resistance and reactance values are dynamically calculated according to the variation amplitude of voltage or current, so that the virtual resistance and reactance values are proportionally adjusted along with the fault degree; and when the system voltage returns to normal, the virtual impedance automatically quits, and the control continuity is ensured. Then, the active and reactive power reference values are dynamically corrected according to the voltage drop depth, a power reference signal matched with the voltage amplitude is generated, it is guaranteed that power output does not exceed the limit, and the voltage supporting capacity is improved. Finally, real-time current-limiting control of the converter and stable operation of the system are realized on the premise of not switching the control mode through the synergistic effect of the virtual impedance ring and the power ring. The method has the advantages of being high in response speed, excellent in current limiting effect, good in control continuity and the like, and is suitable for fault current limiting and voltage support control of the grid-forming converter.

The invention provides a network construction current limiting method, network construction type converter equipment and a new energy system, and relates to the technical field of new energy. The method comprises the following steps: in response to a condition that a power grid signal meets a preset condition, determining that network-forming converter equipment enters a current-limiting mode, and determining virtual impedance of a first stage of the current-limiting mode; determining that the network construction type converter equipment is in a first stage, and controlling the network construction type converter equipment by using the virtual impedance; and determining that the network construction type converter equipment is in a second stage of the current limiting mode, adjusting the virtual impedance according to the power grid signal, and controlling the network construction type converter equipment by using the adjusted virtual impedance. According to the embodiment of the invention, the current limiting mode of the network-forming converter equipment is divided into the first stage and the second stage, and the virtual impedance of the first stage is adjusted in the second stage, so that fault current limitation and power grid voltage support can be considered at the same time.

The invention provides a self-adaptive short-circuit fault current-limiting control method and system for a primary and secondary fusion circuit breaker, and relates to the technical field of circuit protection and manufacturing, and the method comprises the steps: collecting a current value, a voltage value and a state quantity of a circuit breaker, and forming a first operation parameter set; performing feature extraction based on the amplitude abrupt change, the phase offset and the harmonic component, generating a first feature vector, and matching the first feature vector with a preset short-circuit fault feature template to obtain a fault recognition result, a fault type and a position identifier; a dynamic current-limiting control curve is calculated according to the identifier and the current value, a current-limiting control parameter set is generated, and a current-limiting execution mechanism is controlled to obtain current-limiting response data; after the action is completed, a second operation parameter set is collected, current limiting effect analysis is executed to generate state feedback data, and a current limiting control parameter set is updated based on the feedback data; and factory calibration can be carried out on the power electronic current limiting module serving as a current limiting execution mechanism. According to the method, the adaptive capacity and accuracy of current limiting control are improved.

This invention relates to the field of power distribution network technology and discloses a direct-connected integrated energy storage-power flow conversion device and its control method. It employs a direct-connected multi-module series-parallel composite topology, organically integrating multiple functions—power flow conversion module, energy storage module, voltage support and current limiting module—into a single device. Based on a hierarchical coordinated control architecture designed for the three functional circuits, it achieves flexible and precise control of power flow between the two-terminal grids and efficient coordinated management of the energy storage units within the device. It also provides active voltage support and transient fault current limiting protection for the sending-end grid. This integrated design significantly reduces equipment redundancy, simplifies the overall system architecture, and, through the internal coordinated control of each functional module, significantly improves the device's operational reliability under complex conditions such as power flow reversal, load surges, and transient faults.

The present application relates to the field of high-voltage direct current transmission, and aims to provide a topology of bridge arm integrated current-limiting energy-consuming device, a converter valve and a coordinated control method. The topology is a modular MMC architecture of three-phase double bridge arms, which comprises a plurality of MMC sub-modules connected in series in the upper bridge arm, and a current-limiting energy-consuming device composed of a plurality of current-limiting energy-consuming sub-modules connected in series in the lower bridge arm; the current-limiting energy-consuming sub-module comprises a sub-module main power unit and a sub-condition energy-consuming unit, the latter at least contains two energy-consuming units adapted to different fault conditions, and each contains an energy-consuming resistor and an adaptive condition switching device. The present application integrates the functions of direct-current fault current limiting and alternating-current fault energy consumption in the same integrated device, realizes integrated protection of AC and DC faults, does not need to configure multiple sets of separate equipment, and solves the problem of functional redundancy of the traditional scheme. Redundant configuration can be reduced, hardware cost is reduced, system size is reduced, and operation and maintenance complexity is simplified; the risk of device overvoltage breakdown is avoided, and the service life of the equipment is improved.

The invention relates to a low-voltage intelligent circuit breaker fault condition test and evaluation method and system based on a deep neural network. The method comprises the following steps: collecting real-time operation data of a low-voltage intelligent circuit breaker; performing normalization, denoising and feature extraction on the collected real-time operation data of the low-voltage intelligent circuit breaker in sequence; constructing an overcurrent control circuit for executing a fault current limiting (FCL) function; based on the extracted features, a complete protection closed loop from detection, current limiting, isolation to recovery is realized by using a constructed overcurrent control circuit for executing an FCL function; based on the fault record characteristics and the equipment operation state parameters, intelligent fault current detection is carried out by using a deep neural network method to obtain fault data so as to realize an FCL function; and designing heat capacity based on the system thermal resistance parameter and the fault current parameter, and obtaining a low-voltage intelligent circuit breaker fault condition test evaluation result based on thermal performance through thermal simulation and transient modeling. According to the invention, the performance and reliability of the system under the actual fault condition can be predicted and evaluated.

This application provides a VSG fault current limiting control strategy based on reactive power deviation integral feedback, including: constructing a reactive power deviation integral feedback control branch between the reactive power droop control output and the voltage command generation in the VSG reactive power loop; determining an integral feedback compensation value based on reactive power deviation control based on the reactive power deviation integral feedback control branch; and limiting the short-circuit current amplitude based on the integral feedback compensation value. The strategy proposed in this application, by introducing reactive power deviation integral feedback compensation control during fault periods, can equivalently adjust the reactive power droop coefficient and voltage command value, effectively reducing the fault current amplitude during fault periods and providing reactive power support for the system.

The invention provides a partial-capacity medium-voltage flexible interconnection device and a fault current-limiting control method, and belongs to the technical field of medium-voltage power distribution network flexible interconnection, and the device comprises a power frequency isolation transformer, a power flow transfer module, a fault protection module, and a fault current-limiting module formed by connecting a diode rectifier bridge and a thyristor in parallel. During normal operation, the power frequency isolation transformer provides isolation to ensure that the power flow transfer module does not cause loss due to generation of leakage current, and meanwhile, a thyristor SCR1A of the fault protection module is turned off to ensure normal power flow adjustment of the series converter module; when a power grid line breaks down, devices of the series module are all locked, meanwhile, the thyristor SCR1A is rapidly switched on so as to bypass the series module, the thyristor SCR2A of the fault current limiting module is switched off, and the diode rectifier bridge is connected to the line in series and blocks fault current. The device overcomes the defects that a traditional device is high in cost and needs complex protection, gives consideration to efficiency and compactness, and is suitable for low-cost flexible power flow control of the medium-voltage power distribution network.

The present application relates to the technical field of grid-forming converter control, and particularly relates to a grid-forming converter fault ride-through method and system based on dynamic virtual resistance control, which comprises the following steps: adding a control link based on virtual impedance in a grid-forming converter control system; detecting the actual value of grid voltage to determine whether the grid voltage drops; detecting the current amplitude output by the grid-forming converter in real time to determine whether the current amplitude exceeds a set value; if one of the two conditions is met, starting the virtual impedance control link: performing stage-type current limiting control on the virtual resistance, and the size of the virtual resistance provided by the grid-forming converter to the power system is adjusted in real time according to the fault current amplitude; when the grid voltage recovers and the current amplitude is less than the set value, the stage-type current limiting control of the virtual resistance is exited. The present application can realize fault current limiting during grid-forming converter fault ride-through, thereby improving the fault ride-through capability and transient stability performance of the grid-forming converter.

The application relates to the technical field of power distribution networks, and discloses a novel DC power distribution network hybrid current limiter and a polarity self-recovery control method, wherein the hybrid current limiter comprises: hybrid current limiters which are respectively arranged in series between current limiters and DC circuit breakers at two ends of a DC line, and each end hybrid current limiter comprises a current passing branch, a current limiting branch and a commutation branch; the current passing branch is used for providing a current passing path; the current limiting branch is used for limiting the increase of a fault current; and the commutation branch is used for performing current commutation of the current passing branch and the current limiting branch to block the passing of the fault current from the current passing branch; the application not only improves the fault current limiting capacity of the DC power distribution network, but also reduces the breaking stress of the DC circuit breaker and the investment cost of the DC power distribution network system, and realizes fast reclosing.

The application provides a VSG fault whole-process multi-target ride-through control strategy, which comprises the following steps: closing the second switch to a preset first side to establish a first side passage connection; monitoring and judging whether the closing trigger condition of the first switch is met in real time; if yes, closing the first switch and outputting a first target power angle value; when detecting that the power grid fault is removed, closing the second switch to a preset second side and outputting a second target power angle value; and disconnecting the first switch after the VSG restores to stability. The strategy provided by the application realizes the multi-target fault ride-through of the VSG from the regulation and control requirements of the transient synchronization stability of the VSG, fault current limiting, impact current suppression, fault rapid recovery and power support.

A circuit breaker network includes a solid-state circuit breaker (SSCB), one or more circuit breakers, and a current limiting control circuit of the SSCB. The current limiting control circuit is programmed to determine a first time period for keeping the SSCB in an on state, determine a second time period for keeping the SSCB in an off state, and switch, cyclically, the SSCB to the off state for the second time period and then to the on state for the first time period to control the fault current within a predetermined band-to-band range that is below the first current threshold and above the second current threshold for a fault clearance duration.

The invention discloses a single-core step-down phase shifter based on thyristor control and a winding transformation ratio design and multi-mode control method thereof, and the maximum utilization of the winding capacity of the phase shifter and the minimum adjustment step length in the adjustment process are realized through the transformation ratio design of a secondary winding of the phase shifter; when no fault is detected, the transformation ratio of the winding is controlled through the thyristor valve group so as to execute voltage reduction and phase shift operation, the output voltage amplitude and the phase shift angle are kept at reference values, and the system runs normally; after a fault occurs, impedance is calculated, and the fault position is determined; when an upstream fault occurs, entering a low-voltage protection mode, and limiting a non-fault phase-to-ground voltage through a phase shifter winding; and when a downstream fault occurs, entering a fault current limiting mode, and compensating voltage and absorbing power through a phase shifter winding so as to limit fault phase current and maintain non-fault phase voltage. According to the invention, the functions of voltage stabilization during normal operation of the phase shifter, low-voltage protection during abrupt drop of upstream voltage and current limiting during a downstream short-circuit fault can be realized.

The invention relates to a VSG power current cooperative control method, system and device based on an improved SOGI under an unbalanced power grid and a medium, and the method comprises the steps: constructing a VSG control mathematical model, and carrying out the calculation to obtain the instantaneous active power and reactive power provided by a VSG; performing positive and negative sequence separation by adopting an improved SOGI to obtain a positive sequence component and a negative sequence component of voltage and current; during the normal operation state of the system, performing sequence-dividing control of the VSG under the voltage and current double closed loop based on the positive sequence component and the negative sequence component of the voltage and current; during a system fault period, a correlation coefficient is introduced to realize cooperative control of VSG output power constancy and grid-connected current balance, a negative sequence current instruction is obtained through calculation, and virtual impedance is introduced to carry out fault current limiting and carry out positive sequence current instruction calculation under a voltage outer loop. And realizing system stability according to the positive sequence current instruction, the negative sequence current instruction and the reactive power support. The method can be widely applied to the technical field of virtual synchronous generator control.

The application provides a fault current limiting system suitable for an over-configuration network type energy storage system, which comprises: a voltage loop connected with an energy storage unit; a current limiter connected with the voltage loop; the current limiter has an asymmetric limiting boundary, that is, the maximum allowable values of d-axis and q-axis currents in a current d-q coordinate system are different; and a current loop connected with the current limiter and a power grid. The application can realize differentiated constraints of AC side reactive current and DC side active current, and improve the voltage support capability and low voltage ride through performance of the system.

The application discloses a fault current limiting system and method, relates to the field of fault current limiting systems, and the system comprises a first CT, a first fast switch, a second fast switch, a second CT, a capacitor, an inductor, a third fast switch and a control protection system. The first CT and the first fast switch are connected in series in a power grid circuit. The second fast switch, the second CT, the capacitor and the inductor are connected in series to form a loop, and the loop is connected in parallel with the first fast switch. The third fast switch is connected in parallel with the capacitor. The control protection system is used for collecting current signals of the first CT and the second CT, carrying out calculation according to the current signals, and controlling the first fast switch, the second fast switch and the third fast switch to act according to logic. The system can realize that the capacitor and the inductor do not need to flow for a long time, and also meets the first half-wave current limiting requirement.

The application discloses a superconducting charging cable of fault current limiting type, and mainly solves the problems that existing superconducting cables cannot be used for bidirectional direct-current high-power charging and have complex structures. The superconducting charging cable comprises a cable framework and liquid nitrogen passage (1), a composite conductor layer (2) and a thermal insulation shell (3). The cable framework supports the composite conductor layer and the thermal insulation shell. The composite conductor layer is composed of inner and outer superconducting tape layers and inner and outer fault current limiting stabilizing layers, and is wrapped on the cable framework. The inner composite conductor layer and the outer composite conductor layer are separated by using an intermediate layer insulating bushing, so that the bidirectional direct-current charging function of the superconducting cable is realized. The fault current limiting stabilizing layer is armored on the superconducting tape layer, so that the fault current limiting function of the superconducting cable is realized. The thermal insulation shell is wrapped on the outer liquid nitrogen bellows, so that the heat leakage of the cable body to the outside is greatly reduced. The superconducting charging cable has a compact structure, does not need to use a fault current limiter, and can be used for connecting electrode terminals to perform high-power direct-current fast charging on electric vehicles.

The present invention relates to the detection of faults and particularly relates to a system for detecting earth faults in a photovoltaic system (PVS). The method carried out by the system comprises: referencing the PVS to earth; balancing the potential difference between (+) and (-) against earth; detecting earth fault current; limiting the fault current to values that do not affect the continuity of the electricity generation service; identifying the circuit or branch of the PVS with the earth fault; preventing the PVS from disconnecting as a result of the earth fault; and generating an alert signal to report or inform of the existence of an earth fault.

The invention discloses an asymmetric fault current limiting method based on a network-forming type energy storage current converter. The asymmetric fault current limiting method comprises three core links of power parameter setting, internal potential primary compensation and internal potential secondary compensation. In the power parameter setting step, reference amplitudes of an active current and a reactive current are determined based on a fault current limiting range and active support characteristics of a reactive voltage loop of the grid-forming type energy storage converter; setting of power parameters is completed; the internal potential primary compensation is used for compensating the internal potential compensation amount of the negative-sequence current required to be suppressed to the original internal potential; and the internal potential secondary compensation is used for limiting transient overcurrent under an asymmetric fault on the basis of the internal potential primary compensation and power parameter setting. According to the method, through primary compensation of the internal potential, the aim of balancing the current is achieved by suppressing the negative sequence current and limiting the overall current under network-forming type control, and meanwhile, secondary compensation of the internal potential is further introduced, so that transient over-current limitation under an asymmetric fault is achieved.

The invention relates to the field of high-voltage direct-current power transmission, and aims to provide a topology of a bridge arm integrated current-limiting energy consumption device, a converter valve and a coordination control method. The topology is a three-phase double-bridge-arm modular MMC architecture which comprises a plurality of MMC sub-modules connected in series in an upper bridge arm, and a current-limiting energy consumption device formed by connecting a plurality of current-limiting energy consumption sub-modules in series in a lower bridge arm; the current-limiting energy consumption sub-module comprises a sub-module main power unit and a sub-working-condition energy consumption unit, the sub-working-condition energy consumption unit at least comprises two paths of energy consumption units adaptive to different fault working conditions, and each energy consumption unit comprises an energy consumption resistor and an adaptive working condition switching device. The direct current fault current limiting function and the alternating current fault energy consumption function are integrated into the same integrated device, integrated protection of alternating current and direct current faults is achieved, multiple sets of separation equipment do not need to be configured, and the problem of function redundancy of a traditional scheme is solved. Redundant configuration can be reduced, the hardware cost is reduced, the system size is reduced, and the operation and maintenance complexity is simplified; the overvoltage breakdown risk of the device is avoided and the service life of equipment is prolonged.

This invention discloses a deep-grid DC transmission system based on hybrid energy storage, belonging to the field of DC transmission technology for power systems. It includes multiple deep-grid converter stations, multiple DC lines, and a coordination control module. The deep-grid converter stations adopt a modular multilevel converter topology. The hybrid energy storage units within their sub-modules are connected to the converter arms via passive-active co-coupling circuits. A dual-port decoupling control strategy is employed, utilizing the energy storage in the sub-modules to process the unbalanced power on both the AC and DC sides, enabling each converter station to simultaneously possess AC-side virtual synchronous machine characteristics and DC-side grid voltage support capabilities. The coordination control module controls key parameters of the grid-connected converters to achieve system-level coordinated grid construction. Combined with a superconducting current limiter and circuit breaker connected in series on the DC side, the system achieves fault current limiting, non-blocking ride-through, and rapid isolation. This invention significantly improves the transient stability and battery life of high-proportion renewable energy grids.

The invention relates to an offshore wind power direct current collection topology circuit and a direct current line protection method. The circuit comprises a fan side conversion unit, a first-stage boost collection unit, a second-stage boost transmission unit and a grid-connected conversion unit which are connected in sequence, based on the circuit, a direct current line protection method is implemented, and the method comprises the following steps of: respectively arranging current transformers for acquiring current at two ends in real time at two ends of a connecting line between a first-stage boosting collection unit and a second-stage boosting transmission unit; differential current and braking current are calculated according to the collected current; and according to the numerical relationship between the differential current and the brake current and the system voltage parameter, judging the fault type and triggering the corresponding protection action. Compared with the prior art, the method has the advantages that unification of safety and economy of the offshore wind power direct current collection system is achieved, the equipment insulation requirement is lowered through the graded voltage design, dependence on the breaking capacity of a circuit breaker is reduced through fault current limitation, and rapid and accurate fault isolation is guaranteed through the optimized protection criterion.

This invention relates to the field of power system protection and control technology, and discloses a fault handling method for flexible DC distribution networks based on efficient coordination of active current limiting, fault identification, and fault disconnection. This method configures a multi-port fault current limiting module in the flexible DC distribution network. It achieves rapid suppression of fault current by activating a low-impedance current limiting state in the early stages of a fault. During the current limiting process, voltage and current signals are collected, and fault area identification is performed based on voltage-current plane trajectory characteristics. After determining that the fault is within the area, it switches to a high-impedance current limiting state for deep suppression of the fault current, and cooperates with circuit breakers to perform fault disconnection, achieving rapid fault clearance. Simultaneously, the fault identification method normalizes voltage and current data and calculates the trajectory discrete curvature and its cumulative value to accurately distinguish different fault types. This invention achieves coordinated control between active current limiting, fault identification, and fault disconnection, improving fault handling speed and reliability, and exhibiting good resistance to transition resistance and noise interference.

This invention discloses a fault current limiting method for grid-connected energy storage converters based on dynamic virtual impedance. By introducing positive and negative sequence dynamic virtual impedance, the virtual impedance is adjusted to its optimal value in real time according to the degree of grid voltage drop and the magnitude of grid-connected current. This method effectively suppresses short-circuit current under all types of short-circuit faults, including symmetrical and asymmetrical faults, protecting the operational safety of the converter equipment. Furthermore, this method adjusts the power command according to the fault condition, achieving rapid reactive power support while maintaining transient power angle stability. This method facilitates grid fault recovery, enhances the operational stability of new power systems, and effectively solves the problem that existing control methods struggle to simultaneously address fault current limiting and transient instability under severe grid short-circuit faults.

The present application relates to a kind of offshore wind power dc collection topology circuit and dc line protection method, circuit includes: wind turbine side conversion unit, primary voltage boosting collection unit, secondary voltage boosting transmission unit and grid-connected conversion unit connected in turn;Based on this circuit, a kind of dc line protection method is implemented, method includes: in the connecting line between primary voltage boosting collection unit and secondary voltage boosting transmission unit, current transformer for real-time acquisition of current at both ends is respectively arranged;According to the current of acquisition, calculate differential current and braking current;According to the numerical relationship of differential current and braking current and system voltage parameter, the type of fault is discriminated and corresponding protection action is triggered.Compared with prior art, the present application realizes the unity of offshore wind power dc collection system safety and economy, and the insulation requirement of equipment is reduced by hierarchical voltage design, and the dependence on circuit breaker breaking capacity is reduced by fault current limitation, and the optimized protection criterion ensures the rapid and accurate isolation of fault.

This invention belongs to the technical field of protection for high-power power electronic equipment. It discloses a fault current-limiting control method and control system for a T-type modular multilevel DC transformer. The control method includes: calculating a virtual differential-mode impedance voltage at the port for port faults based on the port current signal to obtain a compensation voltage; using the compensation voltage to compensate the bridge arm output voltage calculated by the energy balance control module to obtain a target value for the bridge arm output voltage that can suppress fault current. Furthermore, the compensation voltage may also include a virtual differential-mode impedance voltage at the port and / or a virtual common-mode impedance voltage on the bridge arm. The introduction of virtual impedance in this method does not affect the steady-state performance of the transformer and can adaptively adjust to quickly suppress transient fault currents during transformer faults, achieving targeted suppression of transient faults.

The invention relates to the field of electrical engineering, and discloses a network construction type flexible direct current fault current limiting method, which comprises the following steps of: setting a modulation ratio module, and synchronously and proportionally reducing a d-axis voltage instruction value according to a voltage drop depth during a direct current voltage drop period so as to maintain the modulation ratio of a current converter to be stable and limit fault steady-state overcurrent; meanwhile, a self-adaptive virtual resistance module is arranged, in the fault recovery stage, self-adaptive virtual resistance is calculated according to the minimum direct-current voltage value recorded in the fault period, a voltage compensation value related to real-time current is generated and injected into a control loop, and dynamic damping is formed to restrain transient overcurrent. Through cooperation of the two modules, various kinds of overcurrent in the whole fault process are comprehensively suppressed, the fault ride-through capability of the grid-forming type converter station and the stability of system operation are improved, the virtual resistor introduced in the method only exists in the transient process, accurate damping needed for suppressing transient overcurrent is provided, and the transient stability of the system is guaranteed.

The present application relates to the technical field of grid-forming converter control, and provides a grid-forming converter fault current limiting method, system, device and medium, which comprises extracting positive and negative sequence current components from two-phase synchronous rotating coordinate system according to the obtained three-phase static coordinate system current signal of the converter, obtaining positive and negative sequence current components, after analyzing the positive and negative sequence virtual impedance voltage drop based on the obtained positive sequence current reference value, negative sequence current reference value and angle difference value of the outer loop voltage control output, obtaining positive and negative sequence impedance voltage drop, and combining the positive and negative sequence current components to perform voltage and current double closed loop control to obtain control output voltage and perform pulse width modulation. The present application can eliminate current amplitude calculation oscillation problem without current saturation limiter, ensure that the virtual impedance intervenes in advance and continues to act when the current approaches the limit value, effectively suppresses the fault current, maintains the voltage source characteristics, and further enhances the system stability.

Disclosed in the present invention are a variable admittance-based fault current limiting system and method for a grid-forming converter. The system comprises: a power calculation module, an excitation link module, a virtual rotor module, a coordinate transformation module, a dual-loop control module, and a space vector pulse width modulation module. The power calculation module is used for calculating active power and reactive power of a current power grid; the excitation link module is used for performing steady-state stepless variable susceptance control on the basis of the calculated reactive power, so as to adjust the electromotive force of the current power grid; the virtual rotor module is used for performing transient stepped variable conductance control on the basis of the calculated active power, so as to adjust the phase angle of the current power grid; the coordinate transformation module is used for converting the adjusted electromotive force and phase angle into electromotive force components in a direct current coordinate system; the dual-loop control module is used for generating and calculating a current instruction on the basis of the converted electromotive force components; and the space vector pulse width modulation module is used for generating a modulation signal to guide operation of a switching device.

The application discloses a power aircraft direct current protection system based on a superconducting circuit breaker and a working method thereof, and the system comprises a fault current limiting module and a fault current breaking module in series, wherein the fault current breaking module comprises a main direct current branch, a buffer branch, a commutation branch and a charging branch; the main direct current branch comprises a fast switch S1 and a circuit breaker CB in series; the buffer branch comprises a buffer resistor R1 and a buffer capacitor C1 in series; the commutation branch comprises a fast switch S2, a commutation inductor L and a commutation capacitor C in series; and the charging branch comprises a fast switch S3 and a charging resistor R C The fault current limiting module can not only suppress the fault current to a lower level, but also continuously consume the accumulated energy in the system due to the resistive characteristic of the superconducting tape, so that the fault can be quickly cleared, the efficiency of clearing the fault is improved, and the manufacturing cost of the protection part is reduced.