Smart circuit breaker driven microgrid dynamic control method, system and medium

Abstract

The application discloses a microgrid dynamic control method and system driven by an intelligent circuit breaker, and a medium, relates to the technical field of microgrid dynamic control, and comprises the following steps: collecting positive and negative currents at the outlet side of a grid-connected converter and the pole currents at the head of each feeder in a plurality of feeders; comparing the ratio of the two pole currents with a preset selected pole reliability coefficient and determining a fault type; issuing a hierarchical action time sequence instruction generated according to the fault type to the intelligent circuit breaker cluster for tripping execution to obtain a fault section; generating a dynamic reconstruction instruction, and continuously supplying power to the non-fault section in the bipolar direct-current microgrid according to the dynamic reconstruction instruction. The application solves the technical problems of low fault discrimination accuracy, positioning lag and easy power interruption after fault in the existing bipolar direct-current microgrid, achieves accurate identification, section positioning and dynamic topology reconstruction of the direct-current microgrid, and improves the technical effects of power grid fault disposal efficiency and power supply reliability.

Description

Technical Field

[0001] This invention relates to the field of microgrid dynamic control technology, specifically to a microgrid dynamic control method, system, and medium driven by a smart circuit breaker. Background Technology

[0002] Currently, bipolar DC microgrids are increasingly widely used. Existing microgrid fault handling methods mostly adopt conventional sampling communication architectures, which are not synchronized with data acquisition and command issuance. This makes it difficult to quickly and accurately distinguish different fault types such as single-pole short circuits and inter-pole short circuits, resulting in low efficiency in fault location. At the same time, the timing coordination of traditional protection devices is unreasonable, which can easily cause large-scale power outages after a fault occurs. Furthermore, there is a lack of supporting dynamic grid reconfiguration strategies, which cannot effectively ensure continuous power supply to non-faulty areas. Overall, the fault handling capability and power supply stability are difficult to meet actual operation requirements.

[0003] Existing bipolar DC microgrids suffer from low fault detection accuracy, delayed location, and are prone to power outages after a fault. Summary of the Invention

[0004] This application provides a method, system, and medium for dynamic control of microgrids driven by intelligent circuit breakers, which is used to address the technical problems of low fault identification accuracy, delayed location, and easy power interruption after a fault in existing bipolar DC microgrids.

[0005] In view of the above problems, this application provides a method, system and medium for dynamic control of microgrid driven by intelligent circuit breakers.

[0006] A first aspect of this application provides a microgrid dynamic control method driven by a smart circuit breaker, the method comprising: The positive and negative currents at the output side of the grid-connected converter, as well as the pole currents at the beginning of each feeder in the multiple feeders, are synchronously acquired via Ether CAT bus. When any pole current exceeds a preset overcurrent threshold and the difference in amplitude between the positive and negative pole currents exceeds a preset range, the ratio of the two pole currents is compared with a preset pole selection reliability coefficient to determine the fault type. The graded action timing command generated based on the fault type is sent to the intelligent circuit breaker cluster via Ether CAT bus for tripping execution, thus obtaining the fault section. The main controller is activated to generate a dynamic reconfiguration command based on the fault type and the fault section, and continuous power supply is provided to the non-faulty sections in the bipolar DC microgrid according to the dynamic reconfiguration command.

[0007] A second aspect of this application provides a microgrid dynamic control system driven by a smart circuit breaker, the system comprising: The current acquisition module is used to synchronously acquire the positive and negative currents at the output side of the grid-connected converter, as well as the pole currents at the beginning of each of the multiple feeders, via the Ether CAT bus. The fault type determination module is used to determine the fault type by comparing the ratio of the two pole currents with a preset pole selection reliability coefficient when any pole current exceeds a preset overcurrent threshold and the difference in amplitude between the positive and negative pole currents exceeds a preset range. The fault section acquisition module is used to send a hierarchical action sequence command generated based on the fault type to the intelligent circuit breaker cluster via the Ether CAT bus for trip execution, thereby obtaining the fault section. The continuous power supply module is used to activate the main controller to generate a dynamic reconfiguration command based on the fault type and the fault section, and to continuously supply power to the non-faulty sections of the bipolar DC microgrid according to the dynamic reconfiguration command.

[0008] In a third aspect of this application, a computer-readable storage medium is provided storing a computer program for executing the microgrid dynamic control method for driving an intelligent circuit breaker provided in this application.

[0009] One or more technical solutions provided in this application have at least the following technical effects or advantages: The positive and negative currents at the output side of the grid-connected converter, as well as the pole currents at the beginning of each feeder in the multiple feeders, are synchronously acquired via Ether CAT bus. When any pole current exceeds a preset overcurrent threshold and the difference in amplitude between the positive and negative pole currents exceeds a preset range, the ratio of the two pole currents is compared with a preset pole selection reliability coefficient to determine the fault type. The graded action sequence command generated based on the fault type is then sent to the intelligent circuit breaker cluster via the Ether CAT bus for tripping execution, identifying the faulty section. The main controller is activated to generate a dynamic reconfiguration command based on the fault type and the faulty section, and continuous power supply is provided to the non-faulty sections of the bipolar DC microgrid according to the dynamic reconfiguration command. This achieves the technical effect of accurate fault identification, section location, and dynamic topology reconfiguration in the DC microgrid, improving the efficiency of grid fault handling and power supply reliability. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1This is a flowchart illustrating the microgrid dynamic control method driven by an intelligent circuit breaker provided in an embodiment of this application.

[0012] Figure 2 This is a schematic diagram of the structure of a microgrid dynamic control system driven by an intelligent circuit breaker, provided in an embodiment of this application.

[0013] Explanation of reference numerals in the attached diagram: Current acquisition module 10, fault type determination module 20, fault section acquisition module 30, continuous power supply module 40. Detailed Implementation

[0014] This application provides a method, system, and medium for dynamic control of microgrids driven by intelligent circuit breakers, which addresses the technical problems of low fault identification accuracy, delayed location, and easy power outage after a fault in existing bipolar DC microgrids.

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0016] Example 1, as Figure 1 As shown, this application provides a microgrid dynamic control method driven by a smart circuit breaker, the method comprising: Step S100: Synchronously acquire the positive and negative currents at the output side of the grid-connected converter, as well as the pole currents at the beginning of each of the multiple feeders, via the Ether CAT bus.

[0017] Specifically, this intelligent circuit breaker-driven microgrid dynamic control method is applicable to bipolar DC microgrid systems equipped with a main controller, intelligent circuit breaker clusters, grid-connected converters, and multiple feeders. It relies on the coordinated operation of various core devices within the system to complete the operation control and fault handling of the microgrid. First, a high-speed synchronous acquisition channel is constructed using the EtherCAT industrial real-time bus. Following a unified sampling rhythm, the real-time acquisition, transmission, and local buffering of the positive and negative currents at the grid-connected converter outlet side, as well as the currents at the beginning of all feeders, are completed synchronously to obtain full-loop current data for fault analysis.

[0018] Step S200: When it is detected that the current of any of the electrodes exceeds the preset overcurrent threshold and the difference between the amplitudes of the positive and negative electrodes exceeds the preset range, the ratio of the two electrodes currents is compared with the preset electrode selection reliability coefficient and the fault type is determined.

[0019] Specifically, the real-time collected current data of each pole is monitored and analyzed one by one. First, the value of each pole current is compared with the overcurrent threshold stored in the system. At the same time, the amplitude difference between the positive and negative pole currents on the output side of the grid-connected converter is calculated and verified against the preset deviation range. When both the current of any pole exceeds the threshold and the difference in the amplitude of the two pole currents exceeds the limit, the ratio of the positive current to the negative current is further calculated. This ratio is compared and matched with the preset pole selection reliability coefficient one by one. Based on the matching result, the specific fault type of the current power grid is accurately distinguished and determined.

[0020] Step S300: The hierarchical action timing command generated according to the fault type is sent to the intelligent circuit breaker cluster via the Ether CAT bus for trip execution, thereby obtaining the fault section.

[0021] Specifically, based on the identified fault type, the corresponding protection control logic is retrieved to generate hierarchical action timing instructions with sequential execution order. Leveraging the low latency and high real-time communication characteristics of the EtherCAT bus, the instructions are sent point-to-point to all intelligent circuit breaker clusters in the field. Each circuit breaker strictly follows the timing sequence to perform tripping actions, while simultaneously transmitting its own operating status and tripping signals in real time. The system summarizes all circuit breaker feedback information and combines it with the line topology to accurately locate and delineate the fault section in the power grid.

[0022] Step S400: Activate the main controller to generate a dynamic reconfiguration command based on the fault type and the fault section, and continuously supply power to the non-fault sections in the bipolar DC microgrid according to the dynamic reconfiguration command.

[0023] Specifically, the main controller is triggered to initiate the grid reconfiguration process. The main controller combines the determined fault type, the located fault section, and the original topology of the bipolar DC microgrid to perform real-time calculations and generate dynamic reconfiguration instructions adapted to the current operating conditions according to the preset power supply restoration strategy. After the instructions are issued, all power distribution equipment in the network completes line connection and disconnection, power supply circuit switching, and topology reorganization according to the reconfiguration instructions. While isolating the fault section, the power supply circuit is reconnected for all non-fault sections in the grid, ultimately achieving uninterrupted and continuous power supply to non-fault areas.

[0024] In one possible implementation, step S200 further includes: Step S210: Calculate the ratio of the two currents based on the positive current and the negative current, and determine whether the ratio of the two currents reaches the preset electrode selection reliability coefficient.

[0025] Step S220: If the ratio of the two pole currents reaches the preset pole selection reliability coefficient, the current fault is determined to be a single pole short circuit fault.

[0026] Step S230: If the ratio of the two pole currents does not reach the preset pole selection reliability coefficient, the current fault is determined to be an inter-pole short circuit fault.

[0027] Specifically, the measured values ​​of the positive and negative currents at the output side of the grid-connected converter are extracted, the ratio of the two currents is calculated by division, and then the calculated ratio is compared with the pre-stored polarity reliability coefficient of the system to complete the condition determination.

[0028] When the current ratio between the two poles is detected to meet and reach the preset criteria for pole selection reliability coefficient, the system combines the current operation characteristics and fault discrimination rules of the bipolar DC microgrid to determine that a single-pole short-circuit fault has occurred in the current grid circuit. The system also simultaneously marks the fault type, stores the corresponding current data and judgment results, and provides a basis for subsequent protection commands and grid reconfiguration.

[0029] When the ratio of the two pole currents does not reach the preset pole selection reliability coefficient after comparison, the system combines the bipolar DC microgrid fault discrimination logic and the two pole current operating characteristics to determine that the grid is currently experiencing an inter-pole short-circuit fault. It simultaneously records the fault type, corresponding current sampling data, and discrimination log, providing accurate fault basis for subsequent circuit breaker action command generation and grid topology reconfiguration.

[0030] In one possible implementation, step S300 further includes: Step S310: According to the hierarchical action timing instruction, the first circuit breaker set in the intelligent circuit breaker cluster is tripped instantaneously, and after a preset delay time, the second circuit breaker set in the intelligent circuit breaker cluster is tripped to obtain a unique fault location current path.

[0031] Step S320: Determine the fault section based on the unique fault location current path.

[0032] Specifically, the system analyzes the hierarchical action timing instructions, first controlling the first set of circuit breakers in the intelligent circuit breaker cluster to perform an instantaneous tripping operation, cutting off the corresponding power supply circuit; after waiting for the preset delay time to end, it drives the second set of circuit breakers to complete the tripping action in sequence. Combining the tripping status of each circuit breaker, the circuit on / off status and real-time current data, it reverse-engineers the line direction and finally locates the unique fault current conduction path.

[0033] Based on the unique fault current conduction path that has been located, combined with the preset line topology map of the bipolar DC microgrid, the location of each circuit breaker and the relationship between the circuits, the line sections through which the current flows are matched and identified one by one, the line range corresponding to the fault current is accurately delineated, and finally the clear fault section information is determined and output.

[0034] In one possible implementation, step S310 further includes: The first set of circuit breakers refers to all distributed power supply output side circuit breakers and non-faulty pole circuit breakers upstream of the fault point, while the second set of circuit breakers refers to the faulty pole circuit breaker on the output side of the grid-connected converter.

[0035] Specifically, the first set of circuit breakers refers to the circuit breakers installed on the output side of all distributed power sources within the line area upstream of the fault point, as well as the circuit breakers corresponding to the non-faulty poles in the power grid; the second set of circuit breakers specifically refers to the circuit breakers installed on the output side of the grid-connected converter at the location corresponding to the faulty pole. The two sets of circuit breakers are divided according to their installation location, controlled pole, and function, and are coordinated with hierarchical timing logic to complete the step-by-step tripping action.

[0036] In one possible implementation, step S310 further includes: If the current fault is the single-pole short-circuit fault, compare the fault pole current with the preset positioning threshold value. If the fault pole current reaches the preset positioning threshold value, determine that the fault is located in the predetermined downstream.

[0037] If the current fault is the inter-electrode short circuit fault, compare the smaller of the positive current and the negative current with the preset inter-electrode positioning threshold value. If the smaller one reaches the preset inter-electrode positioning threshold value, it is determined that the fault is located in the predetermined downstream.

[0038] Specifically, when the system determines that a single-pole short-circuit fault has occurred in the power grid, it first extracts the real-time current value corresponding to the fault pole and compares and verifies the current value with the system's preset location threshold value. If the fault pole current is greater than or equal to the preset location threshold value, the system determines that the fault location is in the predetermined downstream section of the current monitoring location by combining the line current transmission law and topology layout.

[0039] When a short-circuit fault is detected between poles in the power grid, the system first extracts the positive and negative currents at the output side of the grid-connected converter, selects the smaller current value, and compares it with a preset pole location threshold. If the smaller current reaches the threshold value, the system determines that the fault location is in a predetermined downstream section of the current monitoring location, based on the power grid line topology and current transmission characteristics.

[0040] In one possible implementation, step S400 further includes: Obtain the energy storage converter connected to the non-faulty pole.

[0041] The energy storage converter switches to composite voltage regulation mode according to the dynamic reconfiguration command to provide continuous power supply to non-faulty sections.

[0042] The composite voltage regulation mode is a composite voltage regulation mode based on droop control and nonlinear disturbance observer feedforward control, including: using feedforward control to suppress bus voltage disturbances and using droop control to distribute unbalanced current among multiple energy storage units.

[0043] Specifically, the system retrieves the equipment topology ledger and pole correspondence table of the bipolar DC microgrid, filters out the normally operating non-faulty poles based on the identified faulty pole information, and then searches for the equipment connected to the circuit of the non-faulty pole in combination with the line connection relationship, and finally accurately obtains the energy storage converter connected to the non-faulty pole.

[0044] After receiving the dynamic reconfiguration command from the main controller, the energy storage converter immediately shuts down the original operating mode and switches to the composite voltage regulation operation state according to the command parameters. In this mode, the energy storage converter outputs stable voltage and power in real time, and in conjunction with the reconfigured topology circuit of the grid, it continuously supplies power to the non-faulty sections in the bipolar DC microgrid, ensuring uninterrupted power supply to the area.

[0045] Among them, the composite voltage stabilization mode integrates two control strategies, namely droop control and nonlinear disturbance observer feedforward control, to operate in synergy. The system collects bus voltage fluctuation signals in real time through a nonlinear disturbance observer and introduces feedforward control to quickly offset and suppress bus voltage disturbances caused by various external factors. At the same time, it dynamically adjusts the output of each energy storage unit based on the droop control algorithm, reasonably distributes the load, and achieves a balanced distribution of unbalanced current among multiple energy storage units, thereby ensuring grid voltage stability and coordinated operation of energy storage equipment.

[0046] In one possible implementation, step S100 further includes: Each intelligent circuit breaker in the intelligent circuit breaker cluster integrates an electromagnetic compatibility optimization circuit, which includes an integrated inductor-fuse element with dual functions of power frequency current fusing and lightning surge current breaking.

[0047] When a normal fault current flows, the integrated inductor-fuse element operates as a common-mode filter inductor to suppress conducted interference.

[0048] When subjected to a lightning surge current exceeding a preset threshold, the integrated inductor-fuse element breaks within microseconds using electromagnetic mass dynamics, thereby protecting the internal control circuit of the circuit breaker.

[0049] Specifically, each smart circuit breaker in the smart circuit breaker cluster integrates an optimized circuit specifically designed to improve the electromagnetic compatibility performance of the equipment. The core of this circuit is an integrated inductor-fuse element, which has dual protection functions. It can perform fuse protection when the line is subjected to power frequency fault current, and can also achieve rapid tripping when subjected to lightning surge current impact, thereby enhancing the operational stability and protection capability of the circuit breaker in complex electromagnetic environments.

[0050] When a normal fault current flows through the line, the integrated inductor-fuse element switches to common-mode filter inductor mode, relying on its own inductance characteristics to attenuate and suppress conducted interference signals in the line, effectively purifying electrical signals and ensuring the stable operation of the circuit breaker circuit.

[0051] When the line is subjected to a lightning surge current with an amplitude exceeding the preset threshold, the integrated inductor-fuse element will break rapidly in a very short time (microseconds) under the action of electromagnetic mass dynamics, thus cutting off the surge current path in time, thereby isolating the surge energy and reliably protecting the control circuit inside the circuit breaker from damage.

[0052] In one possible implementation, step S300 further includes: A resistor-type fault current limiter is connected in series on the output side of the grid-connected converter.

[0053] When the main controller detects a short circuit fault, it sends an activation command to the resistive fault current limiter.

[0054] The issuance time of the input command is synchronized with the instantaneous tripping command of all distributed power source output side circuit breakers.

[0055] Specifically, at the output port of the grid-connected converter, a resistive fault current limiter is connected in series and deployed in series on the main circuit between the grid-connected converter outlet and the DC bus. Relying on the current limiting characteristics of the resistive element, the rise amplitude and rate of change of the fault current are quickly suppressed when a fault occurs in the power grid, thereby reducing the impact of the fault on the entire equipment and lines.

[0056] After the main controller identifies a short-circuit fault by collecting loop current and voltage signals in real time, it immediately generates a corresponding activation command and sends it to the resistive fault current limiter, triggering its internal switching devices to activate the equipment and connect it to the main circuit to perform current limiting.

[0057] At the same time that the main controller issues instantaneous trip commands to all distributed power source output side circuit breakers, it simultaneously sends an activation command to the resistive fault current limiter. The two types of commands are output in parallel to ensure that the fault current limiter and the circuit breaker operate synchronously.

[0058] Example 2, based on the same inventive concept as the microgrid dynamic control method driven by the intelligent circuit breaker in the foregoing examples, such as... Figure 2 As shown, this application provides a microgrid dynamic control system driven by an intelligent circuit breaker. The system and method embodiments in this application are based on the same inventive concept. The system includes: The current acquisition module 10 is used to synchronously acquire the positive and negative currents at the output side of the grid-connected converter, as well as the pole currents at the beginning of each of the multiple feeders, via the EtherCAT bus.

[0059] The fault type determination module 20 is used to determine the fault type by comparing the ratio of the two pole currents with a preset pole selection reliability coefficient when it is detected that the current of any pole current exceeds a preset overcurrent threshold and the difference between the amplitudes of the positive pole current and the negative pole current exceeds a preset range.

[0060] The fault section acquisition module 30 is used to send the hierarchical action timing instructions generated according to the fault type to the smart circuit breaker cluster for trip execution via the Ether CAT bus to obtain the fault section.

[0061] The continuous power supply module 40 is used to activate the main controller to generate a dynamic reconfiguration command based on the fault type and the fault section, and to continuously supply power to the non-fault sections in the bipolar DC microgrid according to the dynamic reconfiguration command.

[0062] Furthermore, the system is also used to implement the following functions: The ratio of the two pole currents is calculated based on the positive pole current and the negative pole current, and it is determined whether the ratio of the two pole currents reaches the preset pole selection reliability coefficient. If the ratio of the two pole currents reaches the preset pole selection reliability coefficient, the current fault is determined to be a single pole short circuit fault. If the ratio of the two pole currents does not reach the preset pole selection reliability coefficient, the current fault is determined to be an inter-pole short circuit fault.

[0063] Furthermore, the system is also used to implement the following functions: According to the hierarchical action timing instructions, the first set of circuit breakers in the intelligent circuit breaker cluster is tripped instantaneously, and after a preset delay time, the second set of circuit breakers in the intelligent circuit breaker cluster is tripped to obtain a unique fault location current path; the fault section is determined based on the unique fault location current path.

[0064] Furthermore, the system is also used to implement the following functions: The first set of circuit breakers refers to all distributed power supply output side circuit breakers and non-faulty pole circuit breakers upstream of the fault point, while the second set of circuit breakers refers to the faulty pole circuit breaker on the output side of the grid-connected converter.

[0065] Furthermore, the system is also used to implement the following functions: If the current fault is the single-pole short-circuit fault, compare the fault pole current with the preset positioning threshold value. If the fault pole current reaches the preset positioning threshold value, it is determined that the fault is located downstream of the predetermined fault. If the current fault is the inter-pole short-circuit fault, compare the smaller of the positive pole current and the negative pole current with the preset inter-pole positioning threshold value. If the smaller of the two reaches the preset inter-pole positioning threshold value, it is determined that the fault is located downstream of the predetermined fault.

[0066] Furthermore, the system is also used to implement the following functions: The energy storage converter connected to the non-faulty pole is obtained; the energy storage converter switches to the composite voltage regulation mode according to the dynamic reconfiguration command to continuously supply power to the non-faulty section; wherein, the composite voltage regulation mode is a composite voltage regulation mode based on droop control and nonlinear disturbance observer feedforward control, including: using feedforward control to suppress bus voltage disturbance, and using droop control to realize the distribution of unbalanced current among multiple energy storage units.

[0067] Furthermore, the system is also used to implement the following functions: Each intelligent circuit breaker in the intelligent circuit breaker cluster integrates an electromagnetic compatibility (EMC) optimization circuit. This EMC optimization circuit includes an integrated inductor-fuse element with dual functions of power frequency current fusing and lightning surge current breaking. When a normal fault current flows, the integrated inductor-fuse element acts as a common-mode filter inductor to suppress conducted interference. When subjected to a lightning surge current exceeding a preset threshold, the integrated inductor-fuse element breaks within microseconds using electromagnetic mass dynamics, thus protecting the internal control circuit of the circuit breaker.

[0068] Furthermore, the system is also used to implement the following functions: A resistive fault current limiter is connected in series on the output side of the grid-connected converter; when the main controller detects a short-circuit fault, it sends an activation command to the resistive fault current limiter; wherein the activation command is issued at the same time as the instantaneous trip command of all distributed power source output side circuit breakers.

[0069] Example 3: Based on the same inventive concept as the microgrid dynamic control method driven by the intelligent circuit breaker in the foregoing examples, this example provides a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the microgrid dynamic control method driven by the intelligent circuit breaker in this application. The processor executes the software programs, instructions, and modules stored in the memory to perform various functional applications and data processing of the computer device, thereby realizing the aforementioned microgrid dynamic control method driven by the intelligent circuit breaker.

[0070] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, the above description focuses on specific embodiments of this specification. Additionally, the processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some implementations, multitasking and parallel processing are possible or may be advantageous.

[0071] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0072] This specification and accompanying drawings are merely illustrative examples of this application and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Therefore, if such modifications and variations fall within the scope of this application and its equivalents, this application intends to include such modifications and variations.

Claims

1. A dynamic control method for microgrids driven by intelligent circuit breakers, applied to a bipolar DC microgrid comprising a main controller, intelligent circuit breaker clusters, grid-connected converters, and multiple feeders, characterized in that, include: The positive and negative currents at the output side of the grid-connected converter, as well as the pole currents at the beginning of each of the multiple feeders, are synchronously acquired via Ether CAT bus. When it is detected that the current of any of the electrodes exceeds the preset overcurrent threshold and the difference between the amplitudes of the positive and negative electrodes exceeds the preset range, the ratio of the two electrodes currents is compared with the preset electrode selection reliability coefficient to determine the fault type. The fault section is obtained by sending the hierarchical action timing command generated according to the fault type to the smart circuit breaker cluster via the Ether CAT bus for trip execution. The main controller is activated to generate a dynamic reconfiguration command based on the fault type and the faulty section, and to continuously supply power to the non-faulty sections in the bipolar DC microgrid according to the dynamic reconfiguration command.

2. The microgrid dynamic control method driven by a smart circuit breaker as described in claim 1, characterized in that, Compare the ratio of the two pole currents with the preset pole selection reliability coefficient and determine the fault type, including: The ratio of the two currents is calculated based on the positive current and the negative current, and it is determined whether the ratio of the two currents reaches the preset electrode selection reliability coefficient. If the ratio of the two pole currents reaches the preset pole selection reliability coefficient, the current fault is determined to be a single pole short circuit fault; If the ratio of the two pole currents does not reach the preset pole selection reliability coefficient, the current fault is determined to be an inter-pole short circuit fault.

3. The microgrid dynamic control method driven by an intelligent circuit breaker as described in claim 2, characterized in that, The fault-type-based hierarchical action timing instructions generated via the Ether CAT bus are sent to the intelligent circuit breaker cluster for tripping execution, resulting in the fault section, including: According to the hierarchical action timing instruction, the first circuit breaker set in the intelligent circuit breaker cluster is tripped instantaneously, and after a preset delay time, the second circuit breaker set in the intelligent circuit breaker cluster is tripped to obtain a unique fault location current path. The fault section is determined based on the unique fault location current path.

4. The microgrid dynamic control method driven by a smart circuit breaker as described in claim 3, characterized in that, The first set of circuit breakers refers to all distributed power supply output side circuit breakers and non-faulty pole circuit breakers upstream of the fault point, while the second set of circuit breakers refers to the faulty pole circuit breaker on the output side of the grid-connected converter.

5. The microgrid dynamic control method driven by an intelligent circuit breaker as described in claim 4, characterized in that, Within the preset delay time, the current detectors at the beginning of each of the multiple feeders determine whether the fault is located downstream based on the current amplitude characteristics of the unique fault location current path, including: If the current fault is the single-pole short-circuit fault, compare the fault pole current with the preset positioning threshold value. If the fault pole current reaches the preset positioning threshold value, determine that the fault is located in the predetermined downstream. If the current fault is the inter-electrode short circuit fault, compare the smaller of the positive current and the negative current with the preset inter-electrode positioning threshold value. If the smaller one reaches the preset inter-electrode positioning threshold value, it is determined that the fault is located in the predetermined downstream.

6. The microgrid dynamic control method driven by an intelligent circuit breaker as described in claim 4, characterized in that, Continuous power supply to the non-faulty sections of the bipolar DC microgrid according to the dynamic reconfiguration command includes, prior to: Obtain the energy storage converter connected to the non-faulty pole; The energy storage converter switches to the composite voltage regulation mode according to the dynamic reconfiguration command to provide continuous power supply to the non-faulty section. The composite voltage regulation mode is a composite voltage regulation mode based on droop control and nonlinear disturbance observer feedforward control, including: using feedforward control to suppress bus voltage disturbances and using droop control to distribute unbalanced current among multiple energy storage units.

7. The microgrid dynamic control method driven by a smart circuit breaker as described in claim 1, characterized in that, Each intelligent circuit breaker in the intelligent circuit breaker cluster integrates an electromagnetic compatibility optimization circuit, which includes an integrated inductor-fuse element with dual functions of power frequency current fusing and lightning surge current breaking. When a normal fault current flows, the integrated inductor-fuse element operates as a common-mode filter inductor to suppress conducted interference; When subjected to a lightning surge current exceeding a preset threshold, the integrated inductor-fuse element breaks within microseconds using electromagnetic mass dynamics, thereby protecting the internal control circuit of the circuit breaker.

8. The microgrid dynamic control method driven by an intelligent circuit breaker as described in claim 4, characterized in that, Also includes: A resistor-type fault current limiter is connected in series on the output side of the grid-connected converter. When the main controller detects a short circuit fault, it sends an activation command to the resistive fault current limiter. The issuance time of the input command is synchronized with the instantaneous tripping command of all distributed power source output side circuit breakers.

9. A microgrid dynamic control system driven by intelligent circuit breakers, applied to a bipolar DC microgrid including a main controller, intelligent circuit breaker clusters, grid-connected converters, and multiple feeders, characterized in that... The system is used to implement the microgrid dynamic control method driven by the intelligent circuit breaker according to any one of claims 1-8, and the system comprises: The current acquisition module is used to synchronously acquire the positive and negative currents at the output side of the grid-connected converter, as well as the pole currents at the beginning of each of the multiple feeders, via the Ether CAT bus. The fault type determination module is used to compare the ratio of the two pole currents with a preset pole selection reliability coefficient and determine the fault type when it is detected that the current of any pole current exceeds a preset overcurrent threshold and the difference between the amplitudes of the positive pole current and the negative pole current exceeds a preset range. The fault section acquisition module is used to send the hierarchical action timing instructions generated according to the fault type to the smart circuit breaker cluster for trip execution via the Ether CAT bus to obtain the fault section; A continuous power supply module is used to activate the main controller to generate a dynamic reconfiguration command based on the fault type and the fault section, and to continuously supply power to the non-fault sections in the bipolar DC microgrid according to the dynamic reconfiguration command.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the microgrid dynamic control method for driving the intelligent circuit breaker as described in any one of claims 1-8.

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