Method and device for eliminating direct current distribution arc and storage medium

Abstract

The application relates to the technical field of direct-current power distribution, and discloses a method and system for eliminating an arc in direct-current power distribution and a storage medium. The method comprises the following steps: connecting an arc protection breaker and an arc fault detector in series between a direct-current input end and an output end, the action time limit of the arc protection breaker being greater than a preset execution time length, and the arc fault detector comprising a normally open execution switch and being connected with an alternating-current auxiliary branch; the alternating-current auxiliary branch comprises an alternating-current power supply, a resonance capacitor module and a rotating permanent magnet transformer; when an arc state value is detected to be greater than a preset value, the execution switch is closed, the alternating-current power supply generates an oscillation potential through the resonance capacitor module and a primary winding, a rotor is driven to rotate to assist magnetism, and an alternating-current induced voltage is generated in a secondary winding. The voltage generates a voltage and a current zero point at a direct-current output end, and the arc is eliminated. The application can realize arc non-tripping elimination in direct-current power distribution, and guarantees power supply continuity.

Description

Technical Field

[0001] This application relates to the technical field of DC power distribution, and in particular to a method, system and storage medium for eliminating DC power distribution arc. Background Technology

[0002] Unlike AC power distribution systems, DC current does not have a natural zero-crossing point. Even under conventional loads of tens of amperes or hundreds of volts, a sustained arc can form at an open circuit or poor contact. In AC systems, open circuit faults in low-voltage circuits typically do not produce sustained arcs; only short-circuit grounding faults can trigger high-energy sustained arcs. However, in DC power distribution lines, any open circuit or poor contact can generate a self-sustaining arc. Because it lacks overcurrent characteristics, circuit breakers cannot identify and trip it. Prolonged arcing can easily lead to equipment damage, fires, and other safety accidents. Therefore, arc protection in DC power distribution systems is crucial for ensuring their safe operation.

[0003] Currently, arc fault protectors are widely used in the market. Their core function is to detect arc faults in electrical circuits in real time, including series arcs and parallel arcs. They quickly disconnect the circuit before the arc energy accumulates to the point of causing a fire. Arc fault protectors effectively address the hidden dangers of series arcs caused by aging insulation and loose connections, significantly reducing the risk of electrical fires caused by arcs and playing a vital safety protection role in AC power distribution systems.

[0004] However, open-circuit faults and associated problems such as poor contact occur far more frequently in electrical systems than short-circuit faults, and arcing caused by such problems is even more common in DC power grids. Existing arc fault protectors only disconnect the circuit to handle these arcs, which leads to a significant increase in system tripping frequency and severely reduces power supply reliability, making them particularly unsuitable for scenarios with high requirements for power supply continuity. Therefore, there is an urgent need for a protection method that can eliminate arcing from common open-circuit faults without tripping, thus balancing safety protection and power supply reliability. Summary of the Invention

[0005] In order to eliminate the arc of common open circuit faults without tripping, this application provides a method, system and storage medium for eliminating arc in DC power distribution.

[0006] In a first aspect, this application provides a method for eliminating electric arcs in DC power distribution, employing the following technical solution:

[0007] A method for eliminating electric arc in DC power distribution includes the following steps:

[0008] An arc protection circuit breaker and an arc fault detector are connected in series between the DC input terminal and the DC output terminal. The arc protection circuit breaker has an operating time limit that is longer than the preset execution time. The arc fault detector is equipped with a normally open execution switch.

[0009] The execution switch is connected to an AC auxiliary branch, which also includes an AC power supply, a resonant capacitor module, and a rotating permanent magnet transformer. The rotating permanent magnet transformer includes a portal core with a circular opening section at the opening and a permanent magnet cylindrical rotor inside. The other side of the portal core has a primary winding and a secondary winding.

[0010] The live wire of the AC power supply, the execution switch, the resonant capacitor module, the primary winding, and the neutral wire of the AC power supply are connected in series in sequence, and the secondary winding is connected in series on the negative terminal of the DC output terminal.

[0011] The arc fault detector detects the arc state in the DC output terminal and generates an arc state value. If the arc state value is greater than a preset state reference value, the execution switch is closed.

[0012] The AC power supply generates an oscillating AC potential through the resonant capacitor module and the primary winding. The oscillating AC potential drives the permanent magnet cylindrical rotor to generate electromagnetic torque and rotate to assist magnetization, thereby generating an AC induced voltage in the secondary winding.

[0013] The AC induced voltage generates a voltage zero-crossing point at the DC output terminal, and a current zero-crossing point is generated based on the voltage zero-crossing point to eliminate DC power distribution arc.

[0014] By adopting the above technical solution, the arc signal corresponding to the arc state in the DC main circuit is measured by the arc protection circuit breaker and the arc fault detector. When the arc signal appears, the arc protection circuit breaker does not trip immediately because it has an execution time. At this time, the execution switch of the arc fault detector closes, and the AC power supply generates a high oscillating AC potential through the oscillating capacitor module and the primary winding of the rotating permanent magnet transformer. This potential causes the permanent magnet cylindrical rotor to generate electromagnetic torque and rotate, playing a magnetizing role. A very high AC induced voltage is generated in the secondary winding. This AC induction is superimposed on the DC output terminal in series, and an AC oscillating voltage with an amplitude exceeding the DC voltage is superimposed on the DC voltage, thereby generating the voltage zero crossing point and the current zero crossing point, so that the arc has the conditions to be extinguished and the arc fault is eliminated. At this time, since the arc protection circuit breaker did not trip and the DC power supply continued to supply power, the DC power distribution system can achieve arc fault isolation without power interruption. This achieves arc fault isolation without tripping. Under the condition of maintaining uninterrupted power supply, the voltage zero-crossing point and current zero-crossing point are generated by superimposing AC oscillation waves to eliminate arc sparks. At the same time, the DC power supply is maintained without interruption, which improves the reliability of DC power supply. Moreover, the arc elimination process does not require manual intervention.

[0015] Optionally, the method further includes the following steps:

[0016] Within a preset historical time period, acquire multiple arc state values ​​corresponding to the closing action of the execution switch;

[0017] Calculate the average arc value and discrete arc value of the multiple arc state values;

[0018] The average calculated value is calculated based on the average value of the electric arc and the preset reference average value, and the discrete calculated value is calculated based on the discrete value of the electric arc and the preset reference discrete value.

[0019] The calculated value of the electric arc is calculated by weighting the average calculated value and the discrete calculated value.

[0020] If the average calculated value is greater than the preset reference calculated value, then the calculation ratio of the electric arc calculated value to the reference calculated value is calculated.

[0021] The state reference value is adjusted inversely based on the calculated ratio. When the calculated ratio increases, the state reference value decreases. When the calculated ratio decreases, the state reference value remains unchanged.

[0022] By adopting the above technical solution, the state reference value is dynamically optimized by analyzing historical arc state data: the arc state value corresponding to the closing action is obtained within the historical period, the average arc value and discrete value are calculated, and the average calculated value and discrete calculated value are compared with the reference value respectively. The weighted average calculated value is then obtained. When the average calculated value exceeds the reference average value, the state reference value is adjusted according to the inverse correlation of the calculated ratio. The arc characteristics are incorporated into the state judgment criteria, and the state reference value is dynamically reduced to adapt to the working conditions of increased arc fluctuations, avoid malfunctions of the actuator switch caused by arc anomalies, improve the adaptability of the control system to complex arc environments, and enhance the reliability and stability of the switch action.

[0023] Optionally, the method further includes the following steps:

[0024] The arc fault detector generates multiple arc state values ​​within a preset detection period;

[0025] Window smoothing filtering is performed on multiple arc state values ​​according to a preset window length;

[0026] The window length is adjusted inversely based on the calculated ratio; the larger the calculated ratio, the shorter the window length, and the smaller the calculated ratio, the longer the window length.

[0027] By adopting the above technical solution, multiple arc state values ​​are generated within a preset detection period, and window smoothing filtering is applied. The window length is adjusted according to the inverse correlation between the calculated arc ratio and the calculated reference value. When the calculated ratio is large, the window length is shortened to enhance the response speed to sudden arcs and capture rapidly changing fault characteristics; when the calculated ratio is small, the window length is extended to improve the smoothing effect on steady-state arcs and reduce the influence of random interference. Dynamically adjusting the window length allows the filtering window to adapt to the arc fluctuation characteristics.

[0028] Optionally, the method further includes the following steps:

[0029] The rotational speed of the permanent magnet cylindrical rotor is obtained based on a preset rotational speed sensor.

[0030] Calculate the ratio of the stated rotational speed to a preset reference rotational speed value;

[0031] The window length is adjusted in a positive correlation with the speed ratio; the larger the speed ratio, the longer the window length, and the smaller the speed ratio, the shorter the window length.

[0032] By adopting the above technical solution, when the AC power load is high, the frequency and speed decrease; when the AC power load is low, the frequency and speed increase. When the speed is high, the window is extended to enhance the smoothing of high-frequency arc signals and reduce interference. When the speed is low, the window is shortened to improve the response speed to low-frequency arcs.

[0033] Optionally, the method further includes the following steps:

[0034] The execution time is greater than the preset minimum time.

[0035] The execution duration is adjusted inversely based on the speed ratio; the larger the speed ratio, the shorter the execution duration, and the smaller the speed ratio, the longer the execution duration.

[0036] By adopting the above technical solutions, the execution time is ensured to be no less than the minimum time. When the speed ratio is large, the execution time is shortened to adapt to the special working conditions of circuit breakers. When the speed ratio is small, the execution time is extended to ensure the continuity of the circuit under high load without interruption and to dynamically adapt to different working conditions.

[0037] Optionally, the method further includes the following steps:

[0038] The weight of the average calculated value is adjusted according to the execution time. The longer the execution time, the greater the weight of the average calculated value, and the shorter the execution time, the smaller the weight of the average calculated value.

[0039] Within the historical time period, obtain the number of actions that cause the execution switch to close.

[0040] The weight of the discrete calculated value is adjusted in a positive correlation with the number of actions. The larger the number of actions, the larger the weight of the discrete calculated value, and the smaller the number of actions, the smaller the weight of the discrete calculated value.

[0041] By adopting the above technical solution, the weight of the average calculated value is adjusted according to the positive correlation of the execution time, and the weight of the discrete calculated value is adjusted according to the positive correlation of the number of actions, thereby strengthening the corresponding weights, making the arc calculation more realistic, and improving the accuracy and adaptability of the state judgment.

[0042] Optionally, the method further includes the following steps:

[0043] The number of times the arc protection circuit breaker breaks is obtained within a preset recording time period;

[0044] If the number of circuit breaks is greater than the preset circuit break reference value, then the circuit break difference between the number of circuit breaks and the circuit break reference value is calculated.

[0045] The duration of the historical time period is adjusted according to the positive correlation between the circuit breaker difference and the historical time period. The larger the circuit breaker difference, the longer the historical time period; the smaller the circuit breaker difference, the shorter the historical time period.

[0046] By adopting the above technical solution, when the number of circuit breaks exceeds the reference value, the historical time period is controlled according to the positive correlation of the circuit break difference. When circuit breaks occur frequently, the data sampling range is expanded to capture more fault characteristics, improve the accuracy of arc characteristic analysis, and enhance the adaptability and reliability of the circuit breaker to abnormal operating conditions.

[0047] Optionally, the method further includes the following steps:

[0048] Calculate the average value of the speed ratio within a preset recording time period;

[0049] The number of turns of the primary winding is adjusted according to the average value of the ratio. The larger the average value of the ratio, the more turns the primary winding has, and the smaller the average value of the ratio, the fewer turns the primary winding has.

[0050] Or / and, the number of turns of the secondary winding is adjusted inversely according to the average value of the ratio. The larger the average value of the ratio, the fewer the number of turns of the secondary winding; the smaller the average value of the ratio, the more the number of turns of the secondary winding.

[0051] By adopting the above technical solution, the number of turns of the primary winding and the secondary winding can be dynamically adapted to the operating conditions of the line.

[0052] Secondly, this application provides a DC power distribution arc elimination system, which adopts the following technical solution:

[0053] A DC power distribution arc elimination system includes a processor, wherein the processor performs the steps of the DC power distribution arc elimination method as described in any of the preceding claims.

[0054] Thirdly, this application provides a storage medium, which adopts the following technical solution:

[0055] A storage medium storing a program, which, when executed by a processor, implements the steps of the method for eliminating DC power distribution arcs as described in any one of the preceding claims.

[0056] In summary, this application includes at least one of the following beneficial technical effects:

[0057] By connecting an arc protection circuit breaker and an arc fault detector in series in the DC main circuit, and adding an AC auxiliary branch containing a rotating permanent magnet transformer, when a dangerous arc is detected, the execution switch is closed to generate an AC induced voltage in the auxiliary branch. This voltage and current zero-crossing point are superimposed at the DC output terminal to eliminate the arc, and the arc protection circuit breaker does not trip to ensure uninterrupted power supply. At the same time, the arc suppression adaptability and accuracy are improved by using parameters such as historical arc data, rotor speed and other dynamic adjustment status reference values, filtering window, execution time and winding turns. The circuit breaker tripping is also used as a backup guarantee, ultimately significantly improving power supply reliability while ensuring safety. Attached Figure Description

[0058] Figure 1 This is a circuit diagram for eliminating arcing in DC power distribution.

[0059] Figure 2 This is a schematic diagram of a rotating permanent magnet transformer.

[0060] Reference numerals: 1. DC input terminal; 2. DC output terminal; 3. Arc protection circuit breaker; 4. Arc fault detector; 5. AC power supply; 6. Resonant capacitor module; 7. Rotating permanent magnet transformer; 8. Secondary winding; 9. Primary winding; 10. Portal core; 11. Circular open section; 12. Permanent magnet cylindrical rotor. Detailed Implementation

[0061] The embodiments of this application are described in detail below, and examples of the embodiments are shown in the accompanying drawings.

[0062] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] This application discloses a method for eliminating electric arcs in DC power distribution, referring to... Figure 1 and Figure 2 It includes the following steps:

[0064] An arc protection circuit breaker 3 and an arc fault detector 4 are connected in series between DC input terminal 1 and DC output terminal 2. The arc protection circuit breaker 3 has an operating time limit longer than a preset execution time, and the arc fault detector 4 contains a normally open execution switch. The arc protection circuit breaker 3 is a circuit breaker with a time delay function, and its operating time limit is set to be longer than the preset execution time. The preset execution time refers to the longest estimated time required from arc detection to successful arc elimination. Setting this operating time limit ensures that the arc protection circuit breaker 3 will not trip prematurely during arc elimination, guaranteeing the continuity of power supply. Only when arc elimination fails and the execution time has exceeded the limit will the arc protection circuit breaker 3 trip, providing a final safety guarantee. The arc fault detector 4 integrates a detection module, a control module, and a normally open execution switch. The detection module can detect arc state-related parameters at DC output terminal 2 in real time using components such as current sensors and voltage sensors, including current waveform distortion and voltage fluctuations during arc generation, and transmit these parameters to the control module. The control module analyzes and processes these parameters to generate arc state values. The execution switch is controlled by the control module and is normally in the open state to avoid affecting the DC main circuit.

[0065] The actuator switch is connected to an AC auxiliary branch, which includes an AC power supply 5, a resonant capacitor module 6, and a rotating permanent magnet transformer 7. The AC power supply 5 uses a power source compatible with the mains power supply to provide power to the AC auxiliary branch. The resonant capacitor module 6 is composed of multiple capacitors combined in a specific manner; only one capacitor is shown in the diagram as a schematic representation. Its capacitance value is precisely calculated to resonate with the subsequent primary winding 9, generating the required oscillating AC potential. The rotating permanent magnet transformer 7 is the core component of the device. It includes a portal core 10, which is made of stacked high-permeability silicon steel sheets to reduce magnetic losses. The portal core 10 has a circular opening section 11 at its opening, the diameter of which is slightly larger than the diameter of the permanent magnet cylindrical rotor 12, providing rotational space for the permanent magnet cylindrical rotor 12. Inside the portal core 10 is the permanent magnet cylindrical rotor 12, made of high-performance permanent magnet materials, such as neodymium iron boron permanent magnets, which have strong magnetism. The other side of the portal core 10 is wound with a primary winding 9 and a secondary winding 8. There is a certain turns ratio between the primary winding 9 and the secondary winding 8, which can be designed according to actual needs.

[0066] The connection method of the AC auxiliary branch is as follows: the live wire of AC power supply 5, the execution switch, the resonant capacitor module 6, the primary winding 9 and the neutral wire of AC power supply 5 are connected in series to form a circuit; the secondary winding 8 is connected in series to the negative terminal of DC output terminal 2, so that the voltage generated by the secondary winding 8 can directly act on the DC main circuit.

[0067] The detection module of the arc fault detector 4 monitors the arc status of the DC output terminal 2 in real time. When an arc is generated due to an open circuit or poor contact at the DC output terminal 2, the detection module will capture the corresponding electrical signal change and transmit it to the control module.

[0068] The control module analyzes the received electrical signals and generates an arc state value. This arc state value is a quantified value obtained by comprehensively considering factors such as arc current distortion, duration, and energy accumulation. The control module has a preset state reference value, which is a critical value for determining whether the arc needs to be eliminated. This reference value is set based on factors such as the rated parameters and load characteristics of the DC power distribution system.

[0069] When the control module determines that the arc state value is greater than the preset state reference value, it indicates that the arc has become dangerous and needs to be eliminated. The control module then sends a closing command to the actuator switch, which changes from the normally open state to the closed state, connecting the AC auxiliary branch.

[0070] After the switch is closed, AC power supply 5 begins to supply power to the AC auxiliary branch. The AC power output from AC power supply 5 passes through resonant capacitor module 6 and primary winding 9. Since the inductance of resonant capacitor module 6 and primary winding 9 forms a resonant circuit, an oscillating AC potential is generated.

[0071] The oscillating alternating electromotive force generates an alternating magnetic field in the portal core 10. This alternating magnetic field interacts with the permanent magnet cylindrical rotor 12, causing it to produce electromagnetic torque. Under the influence of this electromagnetic torque, the permanent magnet cylindrical rotor 12 begins to rotate. During this rotation, it continuously changes the magnetic field distribution within the portal core 10, thus aiding magnetization and enhancing the magnetic field strength and rate of change. The principle of magnetization is as follows: Driven by the oscillating alternating electromotive force, the permanent magnet cylindrical rotor rotates. Its own permanent magnet magnetic field continuously changes its relative position with the portal core as it rotates, dynamically coupling with the alternating magnetic field generated by the primary winding. This not only superimposes and enhances the magnetic field strength within the portal core but also increases the rate of change of the magnetic field, thereby inducing a higher amplitude alternating voltage in the secondary winding, providing the necessary conditions for arc elimination.

[0072] Under the magnetizing effect of the rotating cylindrical rotor 12, the secondary winding 8 will generate an AC induced voltage due to electromagnetic induction. Since the secondary winding 8 is connected in series with the negative terminal of the DC output terminal 2, this AC induced voltage will be superimposed on the DC voltage of the DC main circuit.

[0073] The amplitude of the AC induced voltage is designed to exceed the DC voltage of the DC main circuit. Thus, the voltage at DC output terminal 2 will exhibit a waveform resulting from the superposition of the DC voltage and the AC induced voltage, which will periodically show voltage zero-crossing points. Based on the relationship between voltage and current in the circuit, a corresponding current zero-crossing point will occur when a voltage zero-crossing point occurs.

[0074] The maintenance of a DC arc requires a continuous current. When the current crosses zero, the arc loses the continuous current support and cannot continue to burn, thus being successfully extinguished.

[0075] After the arc is extinguished, the detection module of the arc fault detector 4 will detect the disappearance of the arc state, and the arc state value generated by the control module will be lower than the state reference value. At this time, the control module issues a command to disconnect the execution switch, stop the AC auxiliary branch from working, and restore the DC main circuit to normal DC power supply.

[0076] Since the arc protection circuit breaker 3 did not trip during the entire process, the power supply of the DC power distribution system was never interrupted, thus achieving the goal of eliminating the arc while ensuring the continuity of power supply.

[0077] Furthermore, the entire process of arc detection, judgment, elimination, and subsequent restoration is automatically completed by the corresponding device without human intervention, which improves the timeliness and reliability of arc elimination.

[0078] The arc state value is a quantitative value obtained by comprehensively considering factors such as arc current distortion, duration, and energy accumulation. The specific steps are as follows:

[0079] The control module first collects and preprocesses the current and voltage signals of the electric arc, extracts and quantifies three core features: current distortion, duration, and energy accumulation (0-10), and then calculates them according to preset weights (weights in sequence, such as 0.4, 0.3, 0.3) to generate an electric arc state value (0-10) that comprehensively reflects the degree of danger of the electric arc.

[0080] Arc current distortion A1 quantification method:

[0081] Calculate the distortion coefficient of the current signal within the acquisition period (e.g., 10ms); Distortion coefficient = (sum of squares of the deviations between the actual current waveform and the smoothed DC waveform) / (sum of squares of the smoothed DC waveform); and map it to a value of 0-10 (0 = no distortion, 10 = severe distortion), for example:

[0082] Normal current: distortion coefficient < 0.1 → A1 = 0-1;

[0083] Minor electric arcs (such as short-term contact sparks): distortion coefficient 0.1-0.3 → A1=2-4;

[0084] Continuous arc: distortion coefficient > 0.3 → A1 = 5-10.

[0085] Duration A2 quantization method:

[0086] Based on the duration of continuous occurrence of the arc characteristic signal, it is mapped to a value of 0-10:

[0087] Duration < 50ms → A2 = 0 (determined to be a harmless spark);

[0088] 50ms ≤ duration < 100ms → A2 = 2 - 4 (This needs attention);

[0089] Duration ≥ 100ms → A2 = 5 - 10 (incrementing according to duration, with a maximum of 300ms corresponding to 2 = 10).

[0090] A3 quantization method for waveform distortion:

[0091] The energy during the existence of the electric arc is calculated in real time: E=∫(current×voltage)dt (the integration interval is the duration of the electric arc), and compared with a preset safety threshold (e.g., 10J, based on the ignition point of the insulating material), mapped to a value of 0-10.

[0092] E < 2J → A3 = 0 - 1;

[0093] 2J≤E<5J→A3=2-4;

[0094] E≥5J→A3=5-10 (A3=10 when E=10J).

[0095] The control module calculates the three characteristic parameters (A1, A2, A3) according to the "hazard weight" to obtain the final arc state value (range 0-10): Arc state value = 0.4×A1 + 0.3×A2 + 0.3×A3.

[0096] In this embodiment, the method for eliminating DC power distribution arcs further includes a step of dynamically optimizing the state reference value based on historical arc state data to improve adaptability to complex arc environments. The specific method includes the following steps:

[0097] The system presets a historical time period, which is set according to the operating characteristics of the DC power distribution system, such as 24 hours or 72 hours. Within this historical time period, the control module records the arc state value corresponding to each closing action of the actuator switch in real time. For example, if the actuator switch closes 8 times within 24 hours due to the detection of a dangerous arc, the arc state values ​​triggered by these 8 closing actions are stored synchronously to form a historical arc state dataset.

[0098] The control module performs statistical analysis on the collected arc state values, and calculates the arc average value and arc discrete value:

[0099] The average arc value is calculated using the arithmetic mean method, which is the sum of all arc state values ​​divided by the number of values. For example, if the arc state values ​​corresponding to 8 closing actions are 6.2, 7.5, 5.8, 8.1, 6.9, 7.3, 5.6, and 6.7, then the average arc value is (6.2 + 7.5 + 5.8 + 8.1 + 6.9 + 7.3 + 5.6 + 6.7) ÷ 8 = 6.76.

[0100] The arc dispersion value is calculated using the standard deviation, reflecting the degree of fluctuation in the arc state value. The calculation formula is: the square root of the sum of the squares of the deviations of each arc state value from the average value, divided by the number of values. Taking the above data as an example, the calculated arc dispersion value is 0.89, indicating that the arc state value fluctuates relatively little within this time period; if the dispersion value is greater than 2, it indicates that the arc state fluctuates drastically.

[0101] Average and Discrete Calculations: The system presets a reference average value (e.g., 6.5) and a reference discrete value (e.g., 1.2). The average calculated value is the ratio of the arc average value to the reference average value, i.e., 6.76 ÷ 6.5 ≈ 1.04; the discrete calculated value is the ratio of the arc discrete value to the reference discrete value, i.e., 0.89 ÷ 1.2 ≈ 0.74.

[0102] Arc calculation value: A weighted average is calculated from the average and discrete calculation values. The weights can be set according to the system's sensitivity to arc intensity and fluctuations. For example, the average calculation value has a weight of 0.6, and the discrete calculation value has a weight of 0.4. Then, the arc calculation value = 1.04 × 0.6 + 0.74 × 0.4 ≈ 0.624 + 0.296 = 0.92.

[0103] The system presets a reference calculation value, such as 1.0. When the average calculated value (1.04) is greater than the reference calculated value (1.0), the ratio of the calculated arc value to the reference calculated value is 0.92 ÷ 1.0 = 0.92.

[0104] If the calculated value of the electric arc increases, such as when the calculated ratio becomes 1.2 due to the increase in arc intensity, the state reference value will decrease according to the inverse correlation law, for example, from the original set value of 5.0 to 4.5, so that the actuator switch can trigger the arc suppression action earlier to adapt to the working conditions where the risk of electric arc is increased.

[0105] If the calculated ratio decreases, such as dropping to 0.8, the state reference value remains unchanged at 5.0, avoiding over-adjustment due to short-term fluctuations and ensuring the stability of the switching action.

[0106] Through the aforementioned dynamic adjustment mechanism, the state reference value can be adaptively optimized according to the actual characteristics of historical arcs, improving detection sensitivity when arc risk increases and maintaining the action threshold when the arc state is stable, thereby reducing erroneous or missed actions of the execution switch and improving the reliability of the system in complex arc environments.

[0107] In this embodiment, the method for eliminating DC power distribution arcs further includes window smoothing filtering of the arc state value and dynamic adjustment of the window length to improve the accuracy and response speed of arc state detection. The specific method includes the following steps:

[0108] The control module of the arc fault detector 4 has a preset detection period, such as 50ms, which can be adjusted according to the system's requirements for arc response speed. Within each detection period, it continuously acquires arc characteristic signals from the DC output terminal 2, including current distortion, duration, and energy accumulation, and generates multiple arc state values ​​as described above. For example, within a 50ms detection period, one arc state value is generated every 5ms, resulting in 10 consecutive values, such as 5.2, 5.5, 5.3, 6.8, 7.1, 6.9, 5.8, 5.6, 5.4, and 5.3.

[0109] The control module employs a sliding window smoothing filter algorithm to process multiple arc state values ​​within a cycle, eliminating transient interference such as numerical jumps caused by electromagnetic noise. Specifically:

[0110] The initial window length is preset, such as 15ms for 3 data points. The arithmetic mean of the arc state values ​​within the window is used as the filtered output value.

[0111] A sliding window with a step size of 5ms is used to process 10 data points sequentially throughout the entire detection period. For example, the first window covers data [5.2, 5.5, 5.3], and the filtered value is (5.2+5.5+5.3)÷3=5.3; the next window covers [5.5, 5.3, 6.8], and the filtered value is (5.5+5.3+6.8)÷3=5.9, and so on, finally obtaining 8 filtered and smoothed data points.

[0112] The dynamic adjustment of the window length is based on the calculated ratio (the ratio of the calculated arc value to the reference calculated value), following the inverse correlation adjustment rule:

[0113] The calculated ratio is derived from historical data optimization steps, and as mentioned earlier, it typically ranges from 0.5 to 1.5, reflecting the degree of fluctuation and risk level of the current arc state.

[0114] When the calculated ratio is large, such as 1.3, it indicates that the arc state fluctuates violently and the risk of sudden changes is high. The control module shortens the window length, such as reducing it from 3 data points to 2, corresponding to 10ms. At this time, the filtering window is more sensitive and can quickly capture sudden changes in the arc state. For example, the jump from 6.8 to 7.1 in the above data can be reflected more quickly, avoiding response delay caused by over-filtering.

[0115] When the calculated ratio is small, such as 0.7, it indicates that the arc state is stable and there is little interference. The control module extends the window length, for example, from 3 data points to 4, corresponding to 20ms. At this time, the filtering effect is stronger, which can smooth out random noise, such as the small fluctuations in the data from 5.8 to 5.6, and reduce the risk of false triggering.

[0116] The window length adjustment range is limited to a preset range, such as 2-5 data points, to ensure a balance between filtering effect and response speed, and to avoid system instability caused by extreme values.

[0117] Through the above mechanism, window smoothing filtering can adapt to the fluctuation characteristics of the arc state: when the arc changes abruptly, a short window is used to improve the response speed, and when the arc is stable, a long window is used to enhance the anti-interference capability, so that the filtered arc state value can more accurately reflect the actual fault situation and provide a reliable basis for the action judgment of the switch.

[0118] In this embodiment, the method for eliminating DC power distribution arcs also includes a step of adjusting the window length based on the rotational speed of the permanent magnet cylindrical rotor 12. The filtering effect is optimized by combining the load characteristics of the AC power supply 5. The specific method includes the following steps:

[0119] A preset speed sensor, such as a Hall sensor or photoelectric encoder, is installed on the permanent magnet cylindrical rotor 12 of the rotating permanent magnet transformer 7. The speed sensor detects the rotational speed of the rotor in real time and outputs a speed pulse signal. The control module counts and converts the pulse signal to obtain the real-time speed value of the rotor (unit: r / min).

[0120] The preset speed reference value is the rotor's rated speed corresponding to the AC power supply frequency (50Hz). For example, based on the structural design of the rotating permanent magnet transformer 7, the rotor's rated speed at 50Hz is 3000 r / min. The control module calculates the ratio of the real-time speed value to the speed reference value, i.e.: Speed ​​ratio = Real-time speed value ÷ Speed ​​reference value.

[0121] For example: if the real-time speed is 3600 r / min, the speed ratio = 3600 ÷ 3000 = 1.2; if the real-time speed is 2400 r / min, the speed ratio = 2400 ÷ 3000 = 0.8.

[0122] The speed ratio is negatively correlated with the AC power supply load. Higher loads correspond to lower AC power supply frequencies, resulting in lower rotor speeds and smaller speed ratios; conversely, lower loads lead to higher speeds and larger speed ratios. The control module adjusts the window length of the smoothing filter based on the positive correlation with the speed ratio. The window length is measured in data points, corresponding to the sampling interval within the detection period. The specific rules are as follows:

[0123] The baseline window length is set to 5 data points, corresponding to 25ms within the detection period. Based on a sampling frequency of 10ms / data point, the adjustment range is limited to 3-8 data points to avoid poor anti-interference due to being too short or response delay due to being too long.

[0124] When the speed ratio is large, such as 1.2, corresponding to low load and high speed of AC power supply 5, the high-frequency component of the induced voltage output by the AC auxiliary branch is high, and the arc state value is easily affected by high-frequency noise. The control module extends the window length according to the positive correlation rule, such as increasing it from 5 data points to 7, corresponding to 35ms. A longer window can enhance the smoothing effect on high-frequency fluctuations. For example, averaging the arc state values ​​[5.1, 6.8, 5.3, 7.0, 5.2, 6.9, 5.4] within the detection period can filter out instantaneous high-frequency interference and output a more stable filtered result.

[0125] When the speed ratio is small, such as 0.8, corresponding to high load and low speed of AC power supply 5: at this time, the low-frequency component of the AC induced voltage accounts for a high proportion, the arc state changes relatively slowly but is prone to energy accumulation, and the trend needs to be captured quickly. The control module shortens the window length, such as from 5 data points to 4, corresponding to 20ms. A shorter window can improve the response speed, for example, by averaging [6.2, 6.5, 6.8, 7.1], to reflect the rising trend of the arc state in a timely manner and avoid missing the arc suppression opportunity due to filtering delay.

[0126] By combining the speed ratio to reflect the load and frequency characteristics of the AC power supply, and by dynamically adjusting the window length based on the speed ratio, the filtering process can be adapted to the characteristics of the arc signal under different operating conditions: a long window is used to resist high-frequency interference under low load, and a short window is used to maintain low-frequency response under high load, further improving the accuracy of arc state detection and providing a more reliable basis for executing switching actions.

[0127] In this embodiment, the method for eliminating DC power distribution arcs also includes a dynamic adjustment step for the execution time. By optimizing the execution time in combination with the rotational speed characteristics of the permanent magnet cylindrical rotor 12, a balance between arc elimination effect and power supply continuity can be ensured under different operating conditions. The specific method includes the following steps:

[0128] The system presets a minimum execution time threshold of 0.5 seconds. This value is determined based on the physical process of arc extinguishing, which is the minimum time required for the AC auxiliary branch to generate a zero-crossing point and extinguish the arc. All adjustments must ensure that the final execution time is not less than 0.5 seconds to avoid arc extinguishing failure due to insufficient time.

[0129] The initial execution time is set to a baseline value of 1.0 seconds, which is greater than the minimum duration. This value is suitable for the operating conditions under AC power supply 5 rated load (speed ratio = 1.0).

[0130] The execution time and the speed ratio have an inverse correlation, that is:

[0131] The larger the speed ratio, the lower the AC power load, the higher the rotor speed, and the shorter the execution time.

[0132] The smaller the speed ratio, the higher the AC power load and the lower the rotor speed, resulting in a longer execution time.

[0133] The control module has a built-in adjustment formula: real-time execution time = baseline execution time × (1 ÷ speed ratio), and ≥ 0.5 seconds.

[0134] Under low load conditions, the speed ratio is large:

[0135] When the AC power supply 5 is under low load, such as when the equipment is operating under light load, the real-time rotor speed is 3600 r / min, and the speed ratio = 3600 ÷ 3000 = 1.2 (greater than 1.0).

[0136] Substituting into the formula: Real-time execution time = 1.0 × (1 ÷ 1.2) ≈ 0.83 seconds (≥ 0.5 seconds, valid).

[0137] At this time, the AC auxiliary branch has a high oscillation potential frequency and high energy conversion efficiency, and the arc can be eliminated in a short time. Shortening the execution time (from 1.0 second to 0.83 seconds) can reduce the working time of the auxiliary branch, reduce interference to the DC main circuit, and adapt to the "rapid arc change" conditions that may occur under light load, thereby improving response efficiency.

[0138] Under high load conditions, the speed ratio is small:

[0139] When the AC power supply 5 is under high load, such as when multiple devices are running simultaneously, the real-time rotor speed is 2000 r / min, and the speed ratio = 2000 ÷ 3000 ≈ 0.67 (less than 1.0).

[0140] Substituting into the formula: Real-time execution time = 1.0 × (1 ÷ 0.67) ≈ 1.5 seconds (≥ 0.5 seconds, valid).

[0141] At this time, the oscillating potential frequency of the AC auxiliary branch is low, the energy release is gradual, and the arc elimination process is relatively slow. Extending the execution time (from 1.0 second to 1.5 seconds) can ensure that the AC induced voltage is fully superimposed and a stable zero-crossing point is generated, avoiding arc reignition due to insufficient time; at the same time, the longer execution time provides sufficient arc elimination time for "continuous arc" under high load, ensuring the power supply continuity of the DC main circuit under heavy load conditions.

[0142] Extreme low speed protection:

[0143] If the rotor speed is too low, such as 1000 r / min, the speed ratio is ≈0.33. According to the formula, the real-time execution time is ≈3.0 seconds (still ≥0.5 seconds). Although the execution time is relatively long, it can ensure that the arc is completely eliminated under high load and low frequency conditions, and avoid the circuit breaker from tripping prematurely.

[0144] By adjusting the execution time through the inverse correlation of the speed ratio, the system can adapt to the load changes of AC power supply 5; under low load, it improves the response speed with a short duration, and under high load, it ensures the thoroughness of arc suppression with a long duration, while always meeting the minimum duration requirement, thus taking into account the dual needs of rapid arc suppression and uninterrupted power supply.

[0145] In this embodiment, the method for eliminating DC power distribution arcs further includes a step of dynamically adjusting the weights of the average calculated value and the discrete calculated value. By combining the execution time and the number of switching actions, the weight allocation of the arc calculated value is optimized to improve the accuracy of the state judgment. The specific method includes the following steps:

[0146] The average calculated value reflects the overall intensity trend of historical arc states, and its weight is positively correlated with the execution duration, as follows:

[0147] The baseline weight for the average calculation is set to 0.5, corresponding to a baseline execution time of 1.0 second. The weight adjustment range is limited to 0.3-0.7 to avoid calculation imbalance caused by excessively high or low weights.

[0148] The control module adjusts the average calculated value weight according to the ratio of real-time execution time to baseline execution time using the following formula: Average calculated value real-time weight = Baseline weight × (Real-time execution time ÷ Baseline execution time).

[0149] When the execution time is extended, such as 1.5 seconds under high load conditions:

[0150] The average calculated value's real-time weight is 0.5 × (1.5 ÷ 1.0) = 0.7, reaching the adjustment upper limit. At this point, the execution time is long, indicating that the arc elimination process relies more on a stable intensity trend judgment. Increasing the weight of the average calculated value can strengthen the consideration of the overall arc intensity, for example, reflecting more of the influence of a long-term high arc average value in the arc calculation value.

[0151] When the execution time is shortened, such as 0.8 seconds under low load conditions:

[0152] The average calculated value's real-time weight is 0.5 × (0.8 ÷ 1.0) = 0.4. At this point, the execution time is short, and the arc state is more susceptible to instantaneous changes. Reducing the average calculated value's weight can decrease over-reliance on the overall trend and reserve more weight space for discrete calculated values.

[0153] The discrete calculated values ​​reflect the fluctuations in the historical arc state, and their weights are positively correlated with the number of switch closing actions performed during the historical time period, as follows:

[0154] The control module counts the total number of times the switch closes within a preset historical time period, such as 24 hours. The baseline weight for the discrete calculation value is set to 0.5, corresponding to a baseline number of actions of 10 times / 24 hours. The weight adjustment range is also limited to 0.3-0.7.

[0155] The control module adjusts the weight of the discrete calculation value according to the ratio of the actual number of actions to the baseline number of actions using the following formula: Real-time weight of discrete calculation value = Baseline weight × (Actual number of actions ÷ Baseline number of actions), and the total weight (average calculation value weight + discrete calculation value weight) is always 1.0.

[0156] When the number of movements increases, such as 20 movements in 24 hours:

[0157] The real-time weight of the discrete calculated value is 0.5 × (20 ÷ 10) = 1.0. However, due to the upper limit of adjustment of 0.7, the actual weight is 0.7, and the weight of the average calculated value is correspondingly reduced to 0.3. A large number of actions indicates frequent fluctuations in the arc state. Increasing the weight of the discrete calculated value can strengthen the consideration of the degree of arc fluctuation; for example, the impact of frequently changing arc states can be emphasized in the arc calculated value.

[0158] When the number of movements decreases, such as 5 movements in 24 hours:

[0159] The real-time weight of the discrete calculated value is 0.5 × (5 ÷ 10) = 0.25. Due to the lower limit of adjustment of 0.3, the actual weight is taken as 0.3, and the weight of the average calculated value is correspondingly increased to 0.7. A small number of actions indicates that the arc state is relatively stable. Reducing the weight of the discrete calculated value can reduce the oversensitivity to random fluctuations and rely more on the average calculated value to reflect the overall trend.

[0160] Through the aforementioned dynamic weight allocation mechanism, the composition of the arc calculation value can adapt to the system's operating state: when the execution time is long and the arc state is stable, the average calculation value is used as the main judgment basis, highlighting the overall intensity trend; when there are many actions and the arc fluctuates violently, the discrete calculation value is used as the main judgment basis, highlighting the fluctuation characteristics. This adjustment makes the arc calculation value more in line with the actual working conditions, avoiding misjudgments under a single weight, such as stable arcs being interfered with by overly sensitive fluctuation detection, or fluctuating arcs being missed due to over-reliance on the average value, significantly improving the accuracy of state reference value optimization and the system's adaptability to complex arc environments.

[0161] In this embodiment, the method for eliminating DC power distribution arcs also includes the step of adjusting the duration of the historical time period based on the number of circuit breaks by the arc protection circuit breaker 3. This improves the accuracy of arc characteristic analysis by dynamically adjusting the data sampling range. The specific method includes the following steps:

[0162] The system has a preset recording time period, such as 7 days, to cover short-term operating condition fluctuations. The control module records the number of circuit breaker trips within this time period through the status feedback interface of the arc protection circuit breaker 3, i.e., the number of trips triggered by arc suppression failures. For example, if the circuit breaker trips a total of 6 times within 7 days, the number of trips is recorded as 6.

[0163] The preset circuit breaker reference value is the maximum allowable number of circuit breakers under normal system operation, such as 3 times / 7 days, which is set based on equipment lifespan and power supply reliability requirements. When the actual number of circuit breakers (6 times) within the recorded time period exceeds the circuit breaker reference value (3 times), the historical time period duration adjustment mechanism is triggered.

[0164] The adjustment of the historical time period duration is positively correlated with the circuit breaker difference, and the specific rules are as follows:

[0165] The circuit breaker difference is the difference between the actual number of circuit breaks and the reference number of circuit breaks, i.e.:

[0166] Interruption difference = Actual number of interruptions - Interruption reference value;

[0167] For example, if the actual number of circuit breaks is 6 and the reference number is 3, the difference in circuit breaks is 6 - 3 = 3.

[0168] The baseline duration of the historical time period is set to 24 hours to adapt to conventional arc characteristic analysis. The adjustment range is limited to 12-72 hours to avoid insufficient data due to too short a duration or reduced timeliness due to too long a duration.

[0169] The control module adjusts the duration of the historical time period according to the following formula:

[0170] The real-time historical time period duration = base duration × (1 + circuit breaker difference × 0.5), and shall not exceed the adjustment range.

[0171] When the circuit breaker difference is small, such as twice:

[0172] The real-time historical time period is 24 × (1 + 2 × 0.5) = 24 × 2 = 48 hours. At this point, the number of circuit breaks slightly exceeds the reference value. Appropriately extending the historical time period from 24 hours to 48 hours can increase the data sample size and capture more potential arc fault correlation characteristics, such as the arc frequency pattern in specific time periods.

[0173] When the circuit breaker difference is large, such as 4 times:

[0174] The real-time historical time period is 24 × (1 + 4 × 0.5) = 24 × 3 = 72 hours, reaching the adjustment limit. Frequent circuit breaks at this point indicate a possible persistent system anomaly, such as line aging or load mismatch issues. Extending the time to the maximum allows for comprehensive collection of arc data under different operating conditions, enabling more accurate analysis of the root cause of the fault, such as differences in arc characteristics during high-load periods.

[0175] When the circuit breaker difference is 1:

[0176] The duration of the real-time historical period is 24 × (1 + 1 × 0.5) = 36 hours, which is slightly extended to improve the representativeness of the data.

[0177] By dynamically adjusting the historical time period based on the circuit breaker difference, the system can expand the data sampling range when circuit breaks are frequent, comprehensively capturing the diverse characteristics of arc faults, such as the arc intensity and fluctuation patterns under different loads and at different times. This provides a more comprehensive basis for subsequent state reference value optimization and weight adjustment. When the number of circuit breaks is close to the reference value, a relatively short historical time period is maintained to ensure data timeliness. This mechanism enables arc characteristic analysis to adapt to the severity of the fault, improving the system's diagnostic accuracy and response reliability for abnormal operating conditions, and reducing erroneous adjustments or missed protection due to insufficient data.

[0178] In this embodiment, the method for eliminating DC power distribution arcs also includes a step of dynamically adjusting the number of turns of the rotating permanent magnet transformer 7 winding based on the average value of the speed ratio. This optimizes the electromagnetic induction efficiency to meet the arc elimination requirements under different operating conditions. The specific method includes the following steps:

[0179] The system has a preset recording time period, such as 24 hours, covering typical operating conditions. The control module collects the speed ratio of the permanent magnet cylindrical rotor 12 every 5 minutes, which is the ratio of the real-time speed to the rated speed, and stores it as a raw data sequence. For example, a total of 288 speed ratio data points are collected within 24 hours: such as 1.1, 1.05, 0.9, 0.85...

[0180] The control module calculates the arithmetic mean of all speed ratios within the recording time period to obtain the average ratio. The calculation formula is: Average ratio = (Sum of all speed ratios) ÷ Total number of data.

[0181] For example, if the sum of 288 data points is 259.2, then the average ratio = 259.2 ÷ 288 = 0.9, which reflects that the rotor speed was generally lower than the rated value during this period, corresponding to a higher overall load on AC power supply 5.

[0182] The number of 9 turns in the primary winding is positively correlated with the average ratio. By changing the primary inductance, it adapts to the oscillation potential at different frequencies. The specific rules are as follows:

[0183] The reference number of turns for the primary winding 9 is set to 100 turns. Under the rated operating condition with an average adaptation ratio of 1.0, the adjustment range is limited to 80-120 turns to avoid excessive inductance due to too many turns or excessive current overload due to too few turns.

[0184] The control module achieves the change of the number of turns through a built-in turns adjustment mechanism, such as a winding structure with switchable taps. The adjustment formula is: real-time primary turns = reference turns × average ratio; the result is rounded to the nearest integer and is within the adjustment range.

[0185] When the average ratio is relatively large, such as 1.2, it corresponds to AC power supply 5 operating at low load and high speed:

[0186] The real-time primary winding turns = 100 × 1.2 = 120 turns, reaching the upper limit of adjustment. At this time, the rotor speed is high, and the oscillation frequency of the AC auxiliary branch is high. Increasing the primary winding turns can increase the inductance, which matches the resonant capacitor module 6 to form a more stable high-frequency oscillation, ensuring that the secondary winding 8 induces an AC voltage of sufficient amplitude to meet the requirements for eliminating high-frequency arcs.

[0187] When the average ratio is small, such as 0.8, it corresponds to high load and low speed of AC power supply 5:

[0188] The real-time primary winding turns = 100 × 0.8 = 80 turns, reaching the lower limit of adjustment. At this time, the oscillation frequency is low. Reducing the primary winding turns can reduce the inductance, avoid excessive inductive reactance at low frequencies leading to insufficient current, ensure the energy output of the oscillation potential, and meet the continuous elimination requirements of low-frequency arcs.

[0189] The number of 8 turns in the secondary winding is inversely correlated with the average ratio. The amplitude of the induced voltage is adjusted by changing the turns ratio, as follows:

[0190] The base number of turns of the secondary winding 8 is set to 200 turns, forming a 2:1 ratio with the primary winding of 100 turns, which is suitable for rated operating conditions and the adjustment range is limited to 160-240 turns.

[0191] The formula for adjusting the number of secondary turns is: Real-time number of secondary turns = Base number of turns ÷ Average ratio; the result is rounded to the nearest integer and must be within the adjustment range.

[0192] When the average ratio is large, such as 1.2:

[0193] The real-time secondary winding turns = 200 ÷ 1.2 ≈ 167 turns, taking 167 from the range of 160-240. At this time, the primary winding turns have increased (120 turns). Reducing the secondary winding turns can maintain a reasonable turns ratio, avoid excessive induced voltage leading to overvoltage in the DC main circuit, and ensure the reliability of zero-crossing point generation.

[0194] When the average ratio is small, such as 0.8:

[0195] The real-time secondary winding turns = 200 ÷ 0.8 = 250 turns. Due to the adjustment limit of 240 turns, 240 turns are actually used. At this time, the primary winding turns are reduced (80 turns). Increasing the secondary winding turns can improve the turns ratio, compensate for the induced voltage loss at low frequencies, and ensure that the amplitude of the superimposed AC voltage is sufficient to generate a zero-crossing point, so as to meet the arc elimination requirements under high load.

[0196] By dynamically adjusting the number of turns in the primary and secondary windings based on the average ratio, the electromagnetic induction characteristics of the rotating permanent magnet transformer 7 can adapt to changes in the load and frequency of the AC power supply 5.

[0197] At low load and high speed, high frequency energy conversion is optimized by using a combination of multiple primary windings and fewer secondary windings;

[0198] At high load and low speed, the low-frequency voltage output is enhanced by combining fewer primary windings and more secondary windings.

[0199] This adjustment enables the AC auxiliary branch to stably generate the required AC induced voltage under different operating conditions, ensuring the reliable generation of voltage and current zero-crossing points, and further improving the efficiency and adaptability of arc elimination.

[0200] This application also discloses a DC power distribution arc elimination system, including a processor, wherein the processor performs the steps of the DC power distribution arc elimination method as described in any of the above embodiments.

[0201] This application also discloses a storage medium storing a program that, when executed by a processor, implements the steps of the method for eliminating DC power distribution arcs described in any of the above embodiments.

[0202] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method of eliminating a direct current power distribution arc, characterized by, It comprises the following steps: An arc fault breaker (3) and an arc fault detector (4) are arranged in series between a direct current input end (1) and a direct current output end (2), wherein the action time limit of the arc fault breaker (3) is greater than a preset execution time, and the arc fault detector (4) is provided with a normally open execution switch; The execution switch is connected with an alternating current auxiliary branch, and the alternating current auxiliary branch further comprises an alternating current power supply (5), a resonant capacitor module (6) and a rotating permanent magnet transformer (7); the rotating permanent magnet transformer (7) comprises a door-shaped core (10), the door-shaped core (10) is provided with a circular opening section (11) at an opening, and is internally provided with a permanent magnet cylindrical rotor (12); the door-shaped core (10) is provided with a primary winding (9) and a secondary winding (8) on the other side; The live wire of the alternating current power supply (5), the execution switch, the resonant capacitor module (6), the primary winding (9) and the zero line of the alternating current power supply (5) are connected in series, and the secondary winding (8) is connected in series on the negative electrode of the direct current output end (2); The arc fault detector (4) detects the arc state in the direct current output end (2) to generate an arc state value, and if the arc state value is greater than a preset state reference value, the execution switch is closed; The alternating current power supply (5) generates an oscillating alternating current potential through the resonant capacitor module (6) and the primary winding (9), the oscillating alternating current potential drives the permanent magnet cylindrical rotor (12) to generate an electromagnetic torque to rotate and magnetize, so that the secondary winding (8) generates an alternating current induced voltage; The alternating current induced voltage generates a voltage zero point in the direct current output end (2), and a current zero point is generated based on the voltage zero point to eliminate the direct current distribution arc; In a preset historical time period, a plurality of arc state values corresponding to the closing action of the execution switch are obtained; The arc average value and the arc dispersion value of the plurality of arc state values are calculated; The average calculation value is calculated according to the arc average value and the preset reference average value, and the dispersion calculation value is calculated according to the arc dispersion value and the preset reference dispersion value; The arc calculation value is calculated by weighted average according to the average calculation value and the dispersion calculation value; If the average calculation value is greater than a preset reference calculation value, the calculation ratio of the arc calculation value and the reference calculation value is calculated; The state reference value is inversely related to the calculation ratio, that is, the larger the calculation ratio, the smaller the state reference value, and the smaller the calculation ratio, the state reference value remains unchanged.

2. The method of eliminating direct current power distribution arcs according to claim 1, wherein, The method further comprises the following steps: The arc fault detector (4) generates a plurality of arc state values in a preset detection period; The plurality of arc state values are window smoothed according to a preset window length; The window length is inversely related to the calculation ratio, that is, the larger the calculation ratio, the shorter the window length, and the smaller the calculation ratio, the longer the window length.

3. The method of eliminating direct current power distribution arcs according to claim 2, wherein, The method further comprises the following steps: The rotating speed value of the permanent magnet cylindrical rotor (12) is obtained based on a preset rotating speed sensor; calculating a rotation speed ratio value of the rotation speed value and a preset rotation speed reference value; adjusting the window length according to a positive correlation of the rotation speed ratio value, the greater the rotation speed ratio value, the longer the window length, the smaller the rotation speed ratio value, the shorter the window length.

4. The method of eliminating direct current power distribution arcs according to claim 3, wherein, The method further comprises the following steps: The execution duration is greater than a preset minimum duration; adjusting the execution duration according to an inverse correlation of the rotation speed ratio value, the greater the rotation speed ratio value, the shorter the execution duration, the smaller the rotation speed ratio value, the longer the execution duration.

5. The method of eliminating direct current power distribution arcs according to claim 1, wherein, The method further comprises the following steps: adjusting the weight value of the average calculation value according to a positive correlation of the execution duration, the longer the execution duration, the greater the weight value of the average calculation value, the shorter the execution duration, the smaller the weight value of the average calculation value; acquiring the number of actions of the execution switch generating a closing action within the historical time period; adjusting the weight value of the discrete calculation value according to a positive correlation of the number of actions, the greater the number of actions, the greater the weight value of the discrete calculation value, the smaller the number of actions, the smaller the weight value of the discrete calculation value.

6. The method of eliminating direct current power distribution arcs according to claim 5, wherein, The method further comprises the following steps: acquiring the number of times of breaking of the arc protection circuit breaker (3) within a preset recording time period; if the number of times of breaking is greater than a preset breaking reference value, calculating a breaking difference value of the number of times of breaking and the breaking reference value; adjusting the duration of the historical time period according to a positive correlation of the breaking difference value, the greater the breaking difference value, the longer the historical time period, the smaller the breaking difference value, the shorter the historical time period.

7. The method of eliminating direct current power distribution arcs according to claim 3, wherein, The method further comprises the following steps: calculating a ratio average value of the rotation speed ratio value within a preset recording time period; adjusting the number of turns of the primary winding (9) according to a positive correlation of the ratio average value, the greater the ratio average value, the greater the number of turns of the primary winding (9), the smaller the ratio average value, the smaller the number of turns of the primary winding (9); or / and, adjusting the number of turns of the secondary winding (8) according to an inverse correlation of the ratio average value, the greater the ratio average value, the smaller the number of turns of the secondary winding (8), the smaller the ratio average value, the greater the number of turns of the secondary winding (8).

8. A system for eliminating direct current power distribution arcs, characterized by, The processor executes the steps of the arc elimination method of the direct current distribution arc in the processor.

9. A storage medium, characterized by The storage medium stores a program, and the program is executed by the processor to implement the steps of the arc elimination method of the direct current distribution arc in any one of claims 1-7.

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