Intelligent breaking control method and system of direct current contactor

Abstract

The present application relates to the technical field of electronic circuit control, and particularly relates to an intelligent breaking control method and system of a direct current contactor. The method comprises the following steps: obtaining contact structure parameters of a moving contact and a stationary contact and geometric parameters of an arc extinguishing channel; determining an arc initiation position according to the contact structure parameters, and determining a constraint path of an arc in the arc extinguishing channel in combination with the geometric parameters of the arc extinguishing channel, and establishing a constraint relationship between the arc initiation position and the constraint path; in a breaking trigger process, adjusting a separation stroke and a separation speed of the moving contact according to the constraint relationship, so that the arc migrates from the arc initiation position to an entrance of the arc extinguishing channel along the constraint path; after the arc enters the arc extinguishing channel, dividing the channel into sections according to the geometric parameters of the arc extinguishing channel; the present application enhances the interaction efficiency between the arc and the arc extinguishing structure by breaking control of the direct current contactor, and improves the breaking safety and arc extinguishing efficiency of the direct current contactor under high energy working conditions.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit control technology, and in particular to an intelligent disconnection control method and system for a DC contactor. Background Technology

[0002] DC contactors are widely used in power electronics systems, energy storage systems, and new energy equipment under high-voltage and high-current DC conditions. Their core function is to achieve reliable switching control under load current conditions. However, because DC current does not have a natural zero-crossing point, it is prone to continuous arcing during the breaking process. The arc exists in the contact gap for a long time and migrates towards the arc extinguishing system. Its behavior has strong nonlinear and random characteristics, making the arc trajectory difficult to predict and the arc extinguishing path unstable. This easily leads to problems such as accelerated contact erosion, increased material loss, and prolonged breaking time. Existing technologies usually rely on fixed arc-extinguishing grids or passive magnetic blowout to guide the arc, but they lack precise control over the initial arc generation position, migration path, and multi-segment splitting process. This causes the arc to deviate or even return before entering the arc extinguishing channel, thereby reducing the reliability of breaking. Summary of the Invention

[0003] Therefore, it is necessary to provide an intelligent disconnection control method and system for DC contactors to solve at least one of the above-mentioned technical problems.

[0004] To achieve the above objectives, a method for intelligent disconnection control of a DC contactor includes the following steps: Step S1: Obtain the contact structure parameters of the moving contact and the stationary contact, as well as the geometric parameters of the arc extinguishing channel; determine the arc starting position based on the contact structure parameters, and determine the constraint path of the arc in the arc extinguishing channel in combination with the geometric parameters of the arc extinguishing channel, and establish the constraint relationship between the arc starting position and the constraint path; Step S2: During the disconnection triggering process, adjust the separation stroke and separation speed of the moving contact according to the constraint relationship, so that the arc moves directionally from the arc starting position to the arc extinguishing channel entrance along the constraint path; Step S3: After the electric arc enters the arc extinguishing channel, the channel is divided into sections according to the geometric parameters of the arc extinguishing channel, and the multiple arc columns of different channel sections are determined using each channel section; Step S4: During the advancement of the multiple arc columns along the channel section, when each arc column is extinguished in sequence within the preset arc-breaking section, the contact gap is maintained and the arc return path is blocked, so that the arc is extinguished and the break is completed.

[0005] This invention also provides a DC contactor intelligent disconnection control system, including a main body of the DC contactor intelligent disconnection control system, a power supply unit, and an electrical control unit. The power supply unit is installed inside the main body of the DC contactor intelligent disconnection control system, and the electrical control unit is electrically connected to the power supply unit. The electrical control unit is used to charge the main body of the DC contactor intelligent disconnection control system and control the main body of the DC contactor intelligent disconnection control system. The electrical control unit is used to execute the intelligent disconnection control method of the DC contactor as described above, and includes: The constraint path determination module is used to obtain the contact structure parameters of the moving contact and the stationary contact, as well as the geometric parameters of the arc extinguishing channel; determine the arc starting position based on the contact structure parameters, and determine the constraint path of the arc in the arc extinguishing channel in combination with the geometric parameters of the arc extinguishing channel, thus establishing the constraint relationship between the arc starting position and the constraint path. The moving contact adjustment module is used to adjust the separation stroke and separation speed of the moving contact according to the constraint relationship during the breaking triggering process, so that the arc moves directionally from the arc starting position along the constraint path to the arc extinguishing channel entrance. The multi-segment arc column determination module is used to divide the channel into segments based on the geometric parameters of the arc extinguishing channel after the electric arc enters the arc extinguishing channel, and to determine the multi-segment arc columns of different channel segments using each channel segment; The arc extinguishing and disconnecting module is used to maintain the contact gap and block the arc return path when each arc column is extinguished in sequence within the preset arc-breaking section during the advancement of multiple arc columns along the channel section, so that the arc extinguishing and disconnection are completed.

[0006] The beneficial effects of this invention are as follows: By constructing a collaborative modeling relationship between the contact structure parameters of the moving and stationary contacts and the geometric parameters of the arc-extinguishing channel, a unified mapping of the arc-starting position and the constraint path within the arc-extinguishing channel is achieved. This ensures that the arc is incorporated into the preset spatial constraint system at the initial stage of breaking, reducing the uncertainty of random arc propagation from the source. Furthermore, by collaboratively adjusting the separation stroke and separation speed of the moving contact during the breaking triggering process, the arc can stably migrate directionally towards the arc-extinguishing channel entrance along the constraint path, significantly improving the controllability and path consistency of arc transfer and reducing the arc's residence time in the contact area.

[0007] By segmenting the arc-extinguishing channel and forming multiple arc columns based on the segment structure, the originally continuous arc is spatially discretized into multiple confined arc column units, thereby enhancing the interaction efficiency between the arc and the arc-extinguishing structure. Furthermore, by coordinating the length attenuation and interval changes of the multiple arc columns within the preset arc-breaking section, each arc column sequentially enters an intermittent and extinguishing state according to spatial order, while maintaining the contact gap and blocking the arc return path. This effectively suppresses arc reignition and backflow phenomena, achieving stable, rapid, and reliable arc breaking, and improving the breaking safety and arc-extinguishing efficiency of the DC contactor under high-energy conditions. Attached Figure Description

[0008] Figure 1 A flowchart illustrating the steps of an intelligent disconnection control method for a DC contactor; Figure 2 This is a schematic cross-sectional view of a DC contactor according to one embodiment; Figure 3 This is a schematic diagram of the geometric parameters of the arc extinguishing channel of a DC contactor according to an embodiment; The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0009] The technical method of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0010] Furthermore, the accompanying drawings are merely illustrative of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor methods and / or microcontroller methods.

[0011] It should be understood that although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0012] To achieve the above objectives, please refer to Figures 1 to 3 A method for intelligent disconnection control of a DC contactor includes the following steps: All specific values ​​involved in this embodiment are exemplary parameters used to clearly illustrate the technical operation process and are not the only limitation of the present invention.

[0013] Step S1: Obtain the contact structure parameters of the moving contact and the stationary contact, as well as the geometric parameters of the arc extinguishing channel; determine the arc starting position based on the contact structure parameters, and determine the constraint path of the arc in the arc extinguishing channel in combination with the geometric parameters of the arc extinguishing channel, and establish the constraint relationship between the arc starting position and the constraint path; Step S2: During the disconnection triggering process, adjust the separation stroke and separation speed of the moving contact according to the constraint relationship, so that the arc moves directionally from the arc starting position to the arc extinguishing channel entrance along the constraint path; Step S3: After the electric arc enters the arc extinguishing channel, the channel is divided into sections according to the geometric parameters of the arc extinguishing channel, and the multiple arc columns of different channel sections are determined using each channel section; Step S4: During the advancement of the multiple arc columns along the channel section, when each arc column is extinguished in sequence within the preset arc-breaking section, the contact gap is maintained and the arc return path is blocked, so that the arc is extinguished and the break is completed.

[0014] In one embodiment, structural measurements are performed on the moving and stationary contacts to obtain the contact material type (e.g., silver alloy), the radius of curvature of the contact surface, and the contact pressure distribution. The initial arc occurrence region at the moment of contact separation is determined by high-speed imaging combined with voltage signal acquisition. Continuous position points (0.1 mm intervals) are divided along the contact edge, and the discharge probability at each position is statistically analyzed. The region with the highest discharge probability is selected as the arc-starting position. Simultaneously, the entrance position, channel width, and grid spacing (e.g., 1.5 mm) of the arc-extinguishing channel are obtained, and multiple continuous channel segments are divided along the channel axial direction. Based on the spatial relative positional relationship between the arc-starting position and the arc-extinguishing channel entrance, the preferred arc migration direction is determined, and each channel segment is sequentially connected to form a constraint path for the arc within the arc-extinguishing channel, thereby establishing a correspondence between the arc-starting position and the constraint path.

[0015] At the start of the disconnection triggering, the separation stroke and separation speed of the moving contact are adjusted in real time according to the spatial offset between the arc starting position and the arc extinguishing channel entrance. When the offset is small, the moving contact is kept moving along the initial separation direction so that the arc is stably attached to the arc starting position. When the offset increases, the separation direction is adjusted by superimposing the lateral component through the drive mechanism so that the arc migration direction is gradually aligned with the arc extinguishing channel entrance. As the contact gap gradually increases, the arc is stretched along the separation direction by adjusting the separation speed. When the arc leading edge approaches the arc extinguishing channel entrance, the separation speed and stroke are matched to allow the arc to enter the arc extinguishing channel entrance area and form a continuous migration path.

[0016] After the electric arc enters the arc-extinguishing channel entrance, the channel is divided into sections according to the arrangement structure of the grid plates within the channel, and the cross-sectional dimensions and grid plate gap positions of each channel section are obtained. When the electric arc extends along the axial direction of the channel, its expansion range in the width direction of the channel is restricted, so that the electric arc is concentrated in the central area of ​​the channel. When the electric arc crosses the grid plate gaps, the structural boundaries on both sides of the grid plates are used to divide the electric arc, so that the electric arc forms multiple independent arc segments in adjacent channel sections, thereby forming a multi-segment arc column distributed along the channel.

[0017] After multiple arc columns are formed, the length changes and spatial distribution of each arc column within the corresponding channel section are continuously acquired, and the interval between adjacent arc columns is monitored. As the arc columns advance deeper along the channel section, the channel structure restricts the arc columns, keeping them separated and gradually shortening them. When the arc columns enter the preset arc-breaking section, due to the reduced length of the arc columns and the inability to form a continuous conductive path between them, each arc column will sequentially become discontinuous and extinguish. After all the arc columns are extinguished, the contact gap is maintained and the arc return path is blocked, thus completing the breaking process.

[0018] In another embodiment, assuming the moving contact diameter is 10mm, the stationary contact diameter is 12mm, the contact surface curvature radius is 8mm, and the initial contact separation speed is 1m / s; 100 discrete location points are obtained by sampling at the contact edge, of which about 30 location points have a discharge probability higher than 0.6, and 10 location points concentrated in this area are selected as the arc starting region; the arc extinguishing channel is 30mm long and 5mm wide, with 10 grid plates inside, and the grid plate spacing is 2mm, which are divided into 10 channel segments; the initial offset distance between the arc starting position and the channel entrance is measured to be 3mm, and the arc preferential migration direction is determined by geometric connection, and the arc passes through the center position of each channel segment in sequence to form a constraint path, thereby realizing the path limitation from the arc starting position to the depth of the arc extinguishing channel.

[0019] Assuming an initial spatial offset of 2mm, when the offset is less than 1mm, the separation direction remains unchanged, and the separation speed is 1.2m / s. When the offset increases to the range of 2–4mm, a lateral component of 0.3m / s is superimposed on the separation direction, causing the separation trajectory to deflect approximately 10° toward the arc-extinguishing channel entrance. As the contact gap expands from 0 to 3mm, the separation speed is adjusted from 1.2m / s to 2.0m / s, stretching the arc length from 1mm to 5mm. When the arc front is less than 1mm from the channel entrance, the separation speed is further adjusted to 2.5m / s, allowing the arc front to enter the arc-extinguishing channel and form a stable migration path within approximately 2ms.

[0020] Assuming the arc extinguishing channel is 40mm long and divided into 8 channel segments, each segment is 5mm long and the channel width is 6mm; when the arc enters the channel, its initial length is about 6mm, extending to 10mm in the first and second segments; when the arc crosses the first grid gap (2mm spacing), it is divided into 2 arc columns; when it continues to advance to the third segment, it crosses the second grid to form 3 arc columns; in the fifth segment, it forms about 5 arc columns, each with a length between 2 and 6mm, and located in different channel segments.

[0021] Assuming the 6th to 8th sections of the channel are the arc-breaking sections, when the arc advances to this area, a total of 5 arc columns are formed, with initial lengths of 5mm, 4mm, 3mm, 3mm and 2mm respectively. During the advancement process, the length of each arc column gradually shortens to 3mm, 2.5mm, 2mm, 1.5mm and 1mm, and the distance between adjacent arc columns remains between 1 and 2mm. When the length of the arc column is less than 1mm, it is impossible to maintain a stable arc state, and each arc column extinguishes sequentially within about 3ms. At the same time, the contact gap remains above 5mm, effectively blocking the arc return path, thereby completing the entire breaking process.

[0022] Please refer to [link / reference needed] for further information. Figure 2 The "arc start position" corresponds to the initial formation point of the arc when the contacts separate. The arc migrates directionally along the arc constraint path, presenting the spatial positional relationship between the moving / static contact structure and the arc extinguishing channel. It intuitively reflects the arc's advancement from the contact gap to the arc extinguishing channel entrance and its movement along the constraint path.

[0023] Please refer to [link / reference needed] for further information. Figure 3 When the moving contact separates from the stationary contact, the electric arc is generated from the arc-starting position and then migrates directionally along the constraint path to the entrance of the arc-extinguishing channel. The channel is divided into multiple channel segments by the gaps between the grid plates. After the arc enters, it is segmented by the grid plates to form multiple arc columns, which are extinguished sequentially within the preset arc-extinguishing sections, achieving rapid disconnection.

[0024] Of particular importance, step S1 includes: Obtain the contact morphology parameters and relative arrangement relationship between the moving contact and the stationary contact, and determine the initial contact area where an electric arc is formed during the contact separation process; Based on the distribution of the initial contact area on the contact surface and the separation direction of the moving contact, the contact edge area corresponding to the arc starting position is determined, and the spatial orientation relationship of this area relative to the arc extinguishing channel inlet is obtained. Obtain the entrance position, extension direction, internal grid spacing and arrangement direction of the arc extinguishing channel, and divide the channel into multiple channel segments along the extension direction; Based on the spatial orientation relationship between the arc starting position and each channel segment, the path constraint of the arc from the arc starting position to the arc extinguishing channel entrance and extending along each channel segment is determined sequentially, and the constraint relationship between the arc starting position and the constraint path is established.

[0025] In one embodiment, a three-dimensional topographic scan is performed on the moving and stationary contacts to obtain the height distribution, contact pressure distribution, and local micro-protrusion density of the contact surface contact area. An initial contact area (approximately 35%–55% of the effective contact area) is determined based on the region where the contact pressure exceeds a preset threshold. Furthermore, according to the separation direction of the moving contact relative to the stationary contact (e.g., a vertical pulling direction or an inclined separation direction), boundary projection analysis is performed on the initial contact area to extract the edge sub-region closest to the arc-extinguishing channel inlet as the region corresponding to the arc-starting position. The spatial offset vector (including axial distance and lateral offset) from this region to the arc-extinguishing channel inlet is calculated. The inlet geometric coordinates, channel axis direction, and the spacing parameters and arrangement direction of the internal grid plates are obtained. The arc-extinguishing channel is then divided into multiple continuous channel segments along the channel axis direction, with each channel segment corresponding to the spatial range between two adjacent grid plates.

[0026] Based on the spatial orientation relationship between the arc starting position and each channel segment, the optimal set of arc migration paths is calculated. According to the spatial continuity relationship of "arc starting edge area → channel entrance → first channel segment → subsequent channel segments", the path sequence of the arc under structural constraints during the breaking process is determined, thereby establishing a one-to-one correspondence between the arc starting position and the arc extinguishing channel constraint path.

[0027] In another embodiment, assuming the effective contact area between the moving and stationary contacts is 120 mm², with the high-pressure contact area being approximately 65 mm², accounting for about 54%, the contact micro-protrusion density is determined to be approximately 3.2 × 10⁻⁶ mm². 4 The arc is concentrated in the area slightly to the right of the contact center, with the arc width per cm². With the separation direction vertically upward, the edge bandwidth closest to the arc-extinguishing channel entrance in the initial contact area is determined to be approximately 1.5 mm. This area serves as a candidate region for the arc-starting position, with a spatial distance of approximately 6 mm from the arc-extinguishing channel entrance and a lateral offset of approximately 1.2 mm. The arc-extinguishing channel entrance width is set to 3 mm, and the channel axial length is 25 mm. Six sets of grid structures are installed internally, with an average grid spacing of approximately 4 mm, and the grid arrangement direction is consistent with the channel axis. Based on these parameters, the arc-extinguishing channel is divided into six channel segments along the axial direction, each segment corresponding to a set of grid gap spaces. Calculations based on the spatial projection relationship between the arc-starting position and each segment show that the arc's path angle from the starting edge region to the entrance is approximately 8°, and after entering the channel, it sequentially passes through the spatial constraint areas of segments 1 to 6.

[0028] Preferably, step S2 includes: At the start of the breakout trigger, the spatial offset between the arc-starting position and the arc-extinguishing channel entrance is determined based on the constraint relationship; When the spatial offset is within the preset range, the moving contact is controlled to separate to form a contact gap, so that the electric arc is stably attached to the arc starting position; When the spatial offset exceeds the preset range, adjust the separation direction of the moving contact so that the separation trajectory tends to the entrance of the arc extinguishing channel; After the contact gap is formed, its lateral expansion trend is determined based on the change in the arc attachment position, and the arc is controlled to stretch along the contact separation direction. When the arc extends along the contact separation direction and approaches the entrance of the arc extinguishing channel, the separation stroke and separation speed are coordinated so that the leading edge of the arc enters the entrance of the arc extinguishing channel and forms a continuous migration path; Before the electric arc enters the arc-extinguishing channel entrance, the moving contact separation direction is kept consistent with the continuous migration path until the electric arc completes its directional migration from the arc-starting position to the arc-extinguishing channel entrance.

[0029] In one embodiment, at the start of the interruption trigger, based on the structural arrangement relationship between the moving contact and the stationary contact and the spatial position relationship of the arc extinguishing channel entrance, the relative position between the arc starting position and the arc extinguishing channel entrance is spatially analyzed to obtain the spatial offset state between the two, and the spatial offset state is divided into axial offset component and lateral offset component.

[0030] When the spatial offset is within the preset allowable range, the control moving contact performs a uniform separation action along the preset axial separation trajectory, so that the contact gap is gradually formed in a stable manner, and the arc is stably anchored in the contact edge area corresponding to the arc starting position, avoiding premature arc drift.

[0031] When the spatial offset exceeds the preset allowable range, the separation trajectory of the moving contact is corrected according to the offset trend of the arc-extinguishing channel inlet relative to the contact separation direction. A lateral correction component is superimposed on the original axial separation motion, so that the overall separation path of the moving contact gradually moves closer to the arc-extinguishing channel inlet, thereby reducing the deviation of the subsequent arc migration path. After the contact gap is formed, the changes in the attachment position of the arc on the surfaces of the moving and stationary contacts are continuously collected. By analyzing the continuous offset characteristics of the attachment position in the contact width direction, it is determined whether the arc has a lateral expansion trend.

[0032] When the arc attachment location is detected to be continuously expanding in the contact width direction, the moving contact separation process is dynamically adjusted to shorten the time interval between adjacent separation actions and limit the separation speed within a preset range, so as to enhance the tensile effect of the arc in the axial direction and suppress its lateral diffusion trend.

[0033] As the arc leading edge gradually approaches the entrance of the arc-extinguishing channel and enters the preset alignment area, the separation stroke and separation speed are coordinated and adjusted based on the spatial relationship between the arc leading edge and the entrance boundary. This causes the arc leading edge to gradually move towards the center position of the arc-extinguishing channel entrance, forming a continuous and stable migration path. Before the arc leading edge enters the arc-extinguishing channel entrance, the separation direction of the moving contact is kept consistent with the current migration path direction, allowing the arc to complete the directional migration process from the arc-starting position to the arc-extinguishing channel entrance under controlled guidance.

[0034] Preferably, when the spatial offset is within a preset range, controlling the moving contact to separate to form a contact gap, so that the arc is stably attached to the arc-starting position, includes: When the spatial offset is within the preset range, the moving contact is driven to separate according to the preset separation stroke increment, and an arc contact gap is established between the moving contact and the stationary contact. During the arc contact gap expansion process, the separation stroke increment is controlled to maintain a corresponding relationship with the separation speed, and the arc is anchored in the area corresponding to the arc starting position. When the arc contact gap reaches the preset gap range, the separation stroke increment remains unchanged and the separation speed change is limited, controlling the contact gap to gradually form and maintaining the arc attached to the arc starting position.

[0035] In one embodiment, based on the spatial offset determination result, the moving contact separation control enters a "stable anchoring mode." When the spatial offset is within a preset range, the system limits the separation control to a preset axial separation path to avoid introducing additional lateral disturbances. In this mode, the moving contact is periodically driven according to a preset separation stroke increment. Each driving cycle corresponds to a fixed displacement propulsion unit, gradually forming an initial arc contact gap between the moving and stationary contacts. During this process, the separation stroke increment and separation speed maintain a synchronous matching relationship; that is, within each separation cycle, the stroke propulsion amplitude and time rhythm remain consistent, thereby ensuring the continuity and stability of the gap expansion process.

[0036] As the arc contact gap gradually widens, the system continuously monitors the arc's adhesion status at the contact edge region. By limiting the fluctuation range of the separation speed, the system ensures that the arc remains within the contact edge region corresponding to the arc-starting position, preventing arc migration or drift due to rapid gap changes. When the arc contact gap reaches the upper limit of the preset gap range, the system switches from incremental control of the separation stroke increment to a constant holding state and constrains the change in separation speed to maintain it within a stable range. This allows the contact gap to gradually stabilize and ensures that the arc remains attached to the arc-starting position region, forming a stable initial arc-starting control state.

[0037] In another embodiment, the preset allowable range of spatial offset is set to a limited offset interval near the center region of the contact structure, the separation stroke increment is set to a fixed micro-step unit, and the separation speed is set to a low-speed stable control level. In the initial stage of separation, when the system determines that the spatial offset is within the allowable range, the moving contact separates in a fixed step manner, with each separation producing only a small displacement, causing the contact gap to form slowly.

[0038] During the gap expansion process, the system maintains a stable separation rhythm, ensuring that the stroke increment of each separation cycle is consistent with the time cycle, thereby avoiding arc instability caused by sudden gap changes. Throughout this process, the arc remains stably attached to the arcing initiation region at the contact edge. Once the contact gap reaches the upper limit of the preset range, the system maintains the separation step at a fixed value while limiting the separation speed to prevent significant fluctuations, allowing the contact gap to expand smoothly and gradually, maintaining the arc continuously attached to the initial arcing position until the next stage of the control process begins.

[0039] Preferably, when the spatial offset exceeds a preset range, adjusting the separation direction of the moving contact so that the separation trajectory tends towards the entrance of the arc extinguishing channel includes: When the spatial offset exceeds the preset range, the offset direction of the moving contact separation direction relative to the arc extinguishing channel inlet position is obtained, and the lateral offset state is determined. Adjust the separation motion of the moving contact along the lateral offset trend, and superimpose a lateral component on the moving contact; During the separation process, the change in the attachment position of the electric arc in the contact gap is monitored simultaneously, and the transverse component is corrected based on the change in the attachment position. When the arc front enters the entrance region of the arc extinguishing channel, the lateral component is weakened while maintaining the current separation direction.

[0040] In one embodiment, when a spatial offset exceeding a preset allowable range is detected, the spatial relative relationship between the current separation direction of the moving contact and the arc-extinguishing channel inlet is analyzed. By comparing the mapping relationship between the contact coordinate system and the arc-extinguishing channel inlet coordinate system, the deviation direction of the moving contact separation direction relative to the arc-extinguishing channel inlet is determined, and the current state of lateral offset is determined accordingly. After determining the lateral offset state, a lateral correction component is introduced on the basis of the original axial separation motion, so that the actual movement trajectory of the moving contact is adjusted from a single axial separation to an oblique separation trajectory with directional correction. The direction of the lateral component is consistent with the spatial offset direction of the arc-extinguishing channel inlet, thereby causing the separation trajectory to gradually approach the arc-extinguishing channel inlet.

[0041] During the separation process, information on the change in the arc's attachment position within the contact gap is continuously collected. By tracking the movement trajectory of the arc's leading edge on the contact surface, it is determined whether there is a tendency to deviate from the target migration path. When a shift in the arc's attachment position or an increased tendency to expand is detected, the lateral component is dynamically corrected to align with the actual migration direction of the arc, thereby achieving continuous correction of the arc's movement path. As the arc's leading edge gradually approaches the entrance of the arc-extinguishing channel and enters the entrance region, the intensity of the lateral component is gradually reduced, causing the separation trajectory to gradually transition from oblique control to a stable axial advancement state, while maintaining the current separation direction without significant change. This allows the arc to stably enter the arc-extinguishing channel entrance and continue migrating along the preset path.

[0042] In another embodiment, assuming the initial spatial offset exceeds a preset threshold and the lateral offset is significant, the system initially corrects the separation direction to an oblique separation path deflected approximately 10° to 20° towards the arc-extinguishing channel entrance. During this process, the lateral component is gradually superimposed at a low speed, causing the moving contact separation trajectory to gradually approach the arc-extinguishing channel entrance direction. Simultaneously, the arc attachment position is set to be updated once per cycle. When a slight arc offset is detected, the lateral component is slightly corrected to maintain alignment. When the arc leading edge's distance from the arc-extinguishing channel entrance decreases to within a preset range, the lateral correction intensity is gradually reduced, stabilizing the separation trajectory and maintaining a fixed separation direction, allowing the arc to smoothly enter the arc-extinguishing channel entrance region and complete the transition.

[0043] Preferably, when the spatial offset exceeds a preset range, obtaining the offset direction of the moving contact separation direction relative to the arc extinguishing channel inlet position and determining the lateral offset trend includes: When the spatial offset exceeds the preset range, select two consecutive positions before and after the moving contact separation direction, obtain the relative orientation of the moving contact edge and the arc extinguishing channel entrance position at each position, and record the change results of the relative orientation. Based on the changes in relative orientation, the degree of deviation of the moving contact from the entrance position of the arc-extinguishing channel during the separation process is determined, and the degree of deviation is corresponding to the lateral offset state.

[0044] In one embodiment, when the detected spatial offset exceeds a preset allowable range, two consecutive sampling positions are selected sequentially along the separation path of the moving contact. These two positions correspond to the spatial state of the moving contact at adjacent separation moments, representing the short-term trend of the separation trajectory. For each sampling position, the relative orientation information between the moving contact edge geometric contour and the arc-extinguishing channel inlet is calculated based on their spatial coordinate relationship. The relative orientation characterizes the offset direction and trend of the moving contact edge relative to the arc-extinguishing channel inlet in space. By comparing and analyzing the relative orientations of the previous and subsequent positions, the change results of the relative orientation are obtained. These results reflect whether the moving contact exhibits a trend of moving closer to or further away from the arc-extinguishing channel inlet during the separation process.

[0045] Based on this, the degree of deviation during the separation process of the moving contact is graded according to the relative orientation change results. The degree of deviation is divided into three states: stable deviation, enhanced deviation, or weakened deviation. Furthermore, the degree of deviation is mapped to a lateral offset state for subsequent correction control of the separation trajectory.

[0046] In another embodiment, it is assumed that the moving contact updates its position at a fixed sampling period during separation, recording the orientation relationship between the edge of the moving contact and the entrance of the arc-extinguishing channel once per period. After selecting two consecutive sampling positions, if the deviation angle of the latter position relative to the entrance of the arc-extinguishing channel increases, the lateral offset trend is determined to be enhanced; if the deviation angle decreases, the lateral offset trend is determined to be weakened; if it remains basically unchanged, it is determined to be a stable state. When multiple consecutive periods show enhanced deviation, the current state is classified as a significant lateral offset state and used to trigger subsequent separation trajectory correction control logic.

[0047] Preferably, after the contact gap is formed, determining its lateral expansion trend based on changes in the arc attachment position and controlling the arc stretching along the contact separation direction includes: After the contact gap is formed, the attachment position of the electric arc on the surfaces of the moving contact and the stationary contact is obtained along the contact separation direction and the contact width direction. Based on the continuous offset of the attachment position in the contact width direction, the lateral expansion state of the arc relative to the arcing start position is determined; When the separation is determined to be in a lateral expansion state, the time interval corresponding to the separation stroke is shortened and the separation speed is adjusted to a preset speed range while keeping the separation direction unchanged; When the attachment position shifts from the contact width direction to extending along the contact separation direction, the current separation speed is maintained.

[0048] In one embodiment, after the contact gap is formed, a two-dimensional tracking coordinate system for the arc attachment position is established, with the contact separation direction as the axial reference direction and the contact width direction as the lateral observation direction. The attachment points of the arc on the surfaces of the moving and stationary contacts are continuously sampled. By performing time-series analysis on the sampled attachment positions, the variation components in the axial and width directions are extracted, with particular attention paid to the continuous offset characteristics in the width direction. When the arc attachment position shows a continuous unidirectional offset in the width direction, it is determined that the arc is exhibiting a lateral expansion trend, i.e., the arc energy diffuses in the lateral region and deviates from the arc-starting position.

[0049] After determining that the lateral expansion state has been identified, the separation process of the moving contact is restructured. By shortening the time interval between adjacent separation strokes, the arc achieves axial stretching in a shorter time. Simultaneously, the separation speed is limited within a preset range to ensure the stability of the axial stretching and suppress further lateral expansion. During this process, the separation direction remains unchanged, allowing the arc to be continuously stretched axially under controlled conditions. When the trend of arc attachment position change from width-direction offset to extension along the separation direction, the lateral expansion trend is determined to have subsided. At this point, further compression of the time interval is stopped, and the current separation speed is maintained, allowing the arc to continue to expand stably axially until entering the next stage of the migration process.

[0050] In another embodiment, assuming that there is a slight lateral drift of the arc after the contact gap is formed, the system records the change in the arc attachment position at a fixed sampling period. When the arc continuously shifts to the same side in the contact width direction for several consecutive sampling periods, the system determines that it is in a lateral expansion state and immediately increases the frequency of the separation control cycle, switching the separation action from a standard cycle to a rapid stretching cycle, while adjusting the separation speed to a moderately stable range.

[0051] When the arc offset trend weakens in subsequent sampling and gradually turns to extend along the axial direction, the system no longer adjusts the separation speed, keeping it at the current set value, thereby ensuring that the arc continues to stretch stably along the separation direction and migrates towards the arc extinguishing channel entrance.

[0052] Preferably, when the arc extends along the contact separation direction and approaches the entrance of the arc-extinguishing channel, coordinating the separation stroke and separation speed to ensure that the leading edge of the arc enters the entrance of the arc-extinguishing channel and forms a continuous migration path includes: When the arc extends along the contact separation direction and approaches the entrance of the arc extinguishing channel, the relative positional relationship between the arc front and the entrance boundary of the arc extinguishing channel is obtained, and the entrance alignment interval corresponding to the arc front is determined. When the arc front enters the entrance alignment zone, the matching relationship between the separation stroke and the separation speed is adjusted according to the relative position relationship to control the separation direction of the arc front contact to align with the entrance of the arc extinguishing channel; After aligning the arc front with the arc extinguishing channel entrance, the separation direction remains unchanged and the separation speed is adjusted to the preset propulsion speed, so that the arc front crosses the entrance boundary and enters the arc extinguishing channel, forming a continuous migration path along the constraint path.

[0053] In one embodiment, as the arc continues to extend along the contact separation direction and gradually approaches the entrance of the arc-extinguishing channel, the leading edge of the arc is spatially located and tracked. The energy concentration area at the very front of the arc is used as the basis for leading edge identification, and the boundary contour information of the entrance to the arc-extinguishing channel is extracted simultaneously. By continuously calculating the spatial relationship between the position of the leading edge of the arc and the entrance boundary, the trend of distance change between the two is determined. When the distance enters a preset range, the leading edge of the arc is divided into a "state within the entrance alignment interval". This interval is used to indicate that the leading edge of the arc has the spatial conditions to enter the entrance of the arc-extinguishing channel.

[0054] Once the arc front enters the alignment zone, the system couples and adjusts the separation stroke and separation speed. By reducing the stroke variation per unit time and simultaneously correcting the separation advance rhythm, the arc front gradually moves towards the center of the arc-extinguishing channel entrance, thus achieving directional alignment control. After the arc front and the arc-extinguishing channel entrance are spatially aligned, the separation direction vector remains unchanged, and the separation speed is switched to a preset advance speed. This allows the arc front to cross the entrance boundary and enter the arc-extinguishing channel in a stable advance manner, forming a continuous migration path under the constraints of the channel structure.

[0055] In another embodiment, it is assumed that when the arc front approaches the entrance of the arc-extinguishing channel, the distance between it and the entrance boundary has decreased to the millimeter level. When the system detects that this distance has entered a preset alignment range, it automatically reduces the separation advance cycle and fine-tunes the separation speed, causing the arc front to gradually move towards the entrance center. After completing the alignment judgment, the separation direction remains unchanged, and the separation speed is switched to a preset constant advance level, allowing the arc front to stably cross the entrance boundary and enter the interior of the arc-extinguishing channel, continuing to advance inward along the channel structure constraint path.

[0056] Preferably, step S3 includes: After the electric arc enters the arc extinguishing channel entrance, the channel is divided into sections according to the geometric parameters of the arc extinguishing channel, and the position of the grid gap and the channel cross-sectional range in each channel section are obtained. Based on the spatial position of the electric arc when it enters the channel section, the distribution range of the electric arc within the channel cross section is defined, and the electric arc extension path is formed along the channel extension direction; As the electric arc extends along the channel section, when the arc crosses the gap between the grid plates, the arc is segmented based on the structural boundaries on both sides of the gap between the grid plates, resulting in multiple arc columns in different channel sections.

[0057] In one embodiment, after the arc leading edge enters the arc extinguishing channel entrance, the channel interior is spatially segmented based on the structural geometric parameters of the arc extinguishing channel, dividing the channel along its extension direction into several continuous segments. Each channel segment corresponds to a set of grid gap structures and channel cross-sectional constraint ranges. After the segmentation is completed, a local spatial coordinate system is established for each channel segment, and the specific spatial location of the grid gaps and the boundary range of the channel cross-section within that segment are extracted to constrain the arc's extension pattern within that segment.

[0058] When the electric arc enters a certain channel segment, it is confined to the corresponding channel cross-section based on its current spatial coordinates. This restricts the arc's propagation along the channel's extension direction only within the confined cross-section, creating a geometrically constrained arc extension path. During the arc's extension along the channel, the relative position of the arc's leading edge and the grid gap is continuously monitored. When the arc's leading edge crosses the grid gap boundary, the arc is spatially segmented based on the structural boundaries on both sides of the grid gap. This causes the original continuous arc to break into segments at different segment boundaries, forming multiple independent arc segments distributed along the channel. As the arc continues to advance along the channel, each segment extends independently within its corresponding channel segment, forming a multi-segment arc column structure constrained by multiple segments, achieving segmented control of the arc in space.

[0059] In another embodiment, the arc-extinguishing channel is assumed to be divided into multiple equidistant segments, each separated by grid gaps, which are periodically distributed in space. When the arc enters the arc-extinguishing channel, the system confines its initial position within the cross-sectional area of ​​the current segment, allowing it to gradually extend along the channel's axial direction. During arc propagation, when the arc is detected crossing a grid gap, this position is determined as a segment boundary, and the arc is split at that location, forming two independent arc segments. As the arc continues to advance into subsequent segments, this splitting process is repeated, thereby forming a multi-segment arc column structure within the entire arc-extinguishing channel.

[0060] Preferably, during the extension of the electric arc along the channel section, when the electric arc crosses the gap between the grid plates, the electric arc is segmented based on the structural boundaries on both sides of the gap between the grid plates, resulting in multiple arc columns in different channel sections, including: During the extension of the electric arc along the channel section, when the leading edge of the electric arc enters the range of the grid gap, the relative positional relationship between the leading edge of the electric arc and the structural boundaries on both sides of the grid gap is obtained, and it is determined that the electric arc is in a state of crossing the grid gap. When the electric arc is in a state of crossing the gap between the grid plates, the electric arc is divided based on the structural boundaries on both sides of the gap between the grid plates, and corresponding arc segments are formed before and after the gap between the grid plates respectively; After the arc segments are formed, each arc segment is assigned to an adjacent channel segment according to the position of the grid gap in the channel segment, and the distribution position of each arc segment in the corresponding channel segment is determined, forming an arc column sequence distributed along multiple channel segments.

[0061] In one embodiment, as the arc continues to advance along the arc-extinguishing channel section, a precise spatial calibration system is established for the position of the grid gaps. The two structural boundaries on both sides of each grid gap are defined as the inlet boundary and the outlet boundary, respectively, and used as the spatial reference for arc segmentation determination. As the arc front gradually approaches the grid gap, the system acquires the relative spatial relationship between the arc front position and the inlet and outlet boundaries of the grid gap in real time. By continuously monitoring the changes in the distance between the three, it determines whether the arc front has entered the coverage area of ​​the grid gap. When the arc front enters the grid gap range, the system marks this state as a crossing state and further confirms that the arc is simultaneously constrained by the spatial boundaries of the preceding and following structural boundaries, thereby triggering the segmentation separation mechanism. In the crossing state, based on the structural boundaries on both sides of the grid gap, the arc is spatially segmented, forming a front arc segment before the inlet boundary and a rear arc segment after the outlet boundary, thereby realizing the disconnection and reconstruction of the arc continuum. After the arc segment is formed, based on the spatial sequence position of the grid gap in the overall section of the arc extinguishing channel, the front arc segment and the rear arc segment are mapped to the adjacent channel segments respectively, and the specific distribution position of each arc segment in its respective channel segment is determined, so that they are rearranged along the channel extension direction to form an arc column sequence structure continuously distributed along multiple channel segments.

[0062] In another embodiment, it is assumed that the gaps between the grid plates within the arc-extinguishing channel are arranged periodically at a fixed interval, and the arc advances forward in the channel at a stable speed. When the leading edge of the arc enters a certain gap region, the system determines that it is simultaneously constrained by the front and rear structural boundaries and confirms that it has entered a crossing state. In this state, the system divides the arc into two arc segments before and after the gap between the grid plates, distributing them accordingly in adjacent channel segments, and sequentially records the spatial position of each arc segment according to the grid plate position order, thereby forming a multi-segment arc column structure arranged according to the channel segments.

[0063] Of particular importance, step S4 includes: During the advancement of multiple arc columns along the channel section, the distribution position and length change of each arc column in the corresponding channel section are obtained, and the interval state between adjacent arc columns is determined. Based on the length variation and spacing of each arc column, the connection trend between the arc columns is restricted, allowing each arc column to extend independently within its corresponding channel section. When each segment of the arc column enters the preset arc break section, the arc column is determined to be in an intermittent state based on the changes in the shortening of the arc column length and the increase of the interval. When each segment of the arc column is in an intermittent state and disappears in sequence, the contact gap is maintained and the arc return path is blocked, so that the arc is extinguished as a whole and the break is completed.

[0064] In one embodiment, during the formation and advancement of multiple arc columns along each segment of the arc-extinguishing channel, each arc column within the channel segment is independently tracked and modeled. The spatial distribution, axial extension length, and local energy distribution of each arc column are used as basic observation parameters to construct an arc column state sequence. By continuously analyzing the spatial relationship between adjacent arc columns, the trend of interval changes between arc columns is calculated, thereby characterizing whether there is a tendency for the arc columns to converge or connect. When the interval between arc columns is detected to remain stable or gradually decrease, a potential connection trend is determined to exist.

[0065] Based on this trend determination, the extension behavior of the arc within each channel segment is constrained and controlled. By limiting the energy expansion direction and connection path between arc columns, each arc column maintains an independent spatial distribution, thus achieving independent extension of the arc columns within each channel segment. When an arc column enters a preset arc-breaking section, the system continuously monitors the changes in arc column length and the evolution trend of the interval between adjacent arc columns. When the system detects that the arc column length is continuously shortening and the adjacent interval is gradually increasing, it determines that the arc column has entered an intermittent attenuation state. In this intermittent state, each arc column gradually attenuates energy and disappears sequentially according to its spatial order in the channel. During this process, the system maintains a stable contact gap and continuously blocks the arc path through the channel structure, thereby cutting off the arc return path and enabling the entire arc to be extinguished in a controlled manner, achieving the broken state.

[0066] In another embodiment, it is assumed that multiple arc columns advance sequentially in fixed segments within the arc-extinguishing channel, gradually decreasing in length during the advancement. When the system detects that the length of an arc column is lower than a preset threshold and the interval between adjacent arc columns gradually increases, it determines that the arc column has entered an intermittent state. In this state, each arc column decreases sequentially until it disappears, the system maintains the contact gap to prevent retraction, and simultaneously maintains the channel structure's blocking effect on the arc path, allowing the arc to be completely extinguished.

[0067] This invention also provides a DC contactor intelligent disconnection control system, including a main body of the DC contactor intelligent disconnection control system, a power supply unit, and an electrical control unit. The power supply unit is installed inside the main body of the DC contactor intelligent disconnection control system, and the electrical control unit is electrically connected to the power supply unit. The electrical control unit is used to charge the main body of the DC contactor intelligent disconnection control system and control the main body of the DC contactor intelligent disconnection control system. The electrical control unit is used to execute the intelligent disconnection control method of the DC contactor as described above, and includes: The constraint path determination module is used to obtain the contact structure parameters of the moving contact and the stationary contact, as well as the geometric parameters of the arc extinguishing channel; determine the arc starting position based on the contact structure parameters, and determine the constraint path of the arc in the arc extinguishing channel in combination with the geometric parameters of the arc extinguishing channel, thus establishing the constraint relationship between the arc starting position and the constraint path. The moving contact adjustment module is used to adjust the separation stroke and separation speed of the moving contact according to the constraint relationship during the breaking triggering process, so that the arc moves directionally from the arc starting position along the constraint path to the arc extinguishing channel entrance. The multi-segment arc column determination module is used to divide the channel into segments based on the geometric parameters of the arc extinguishing channel after the electric arc enters the arc extinguishing channel, and to determine the multi-segment arc columns of different channel segments using each channel segment; The arc extinguishing and disconnecting module is used to maintain the contact gap and block the arc return path when each arc column is extinguished in sequence within the preset arc-breaking section during the advancement of multiple arc columns along the channel section, so that the arc extinguishing and disconnection are completed.

[0068] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A method for intelligent disconnection control of a DC contactor, characterized in that, Includes the following steps: Step S1: Obtain the contact structure parameters of the moving contact and the stationary contact, as well as the geometric parameters of the arc extinguishing channel; determine the arc starting position based on the contact structure parameters, and determine the constraint path of the arc in the arc extinguishing channel in combination with the geometric parameters of the arc extinguishing channel, and establish the constraint relationship between the arc starting position and the constraint path; Step S2: During the disconnection triggering process, adjust the separation stroke and separation speed of the moving contact according to the constraint relationship, so that the arc moves directionally from the arc starting position to the arc extinguishing channel entrance along the constraint path; Step S3: After the electric arc enters the arc extinguishing channel, the channel is divided into sections according to the geometric parameters of the arc extinguishing channel, and the multiple arc columns of different channel sections are determined using each channel section; Step S4: During the advancement of the multiple arc columns along the channel section, when each arc column is extinguished in sequence within the preset arc-breaking section, the contact gap is maintained and the arc return path is blocked, so that the arc is extinguished and the break is completed.

2. The intelligent disconnection control method for a DC contactor according to claim 1, characterized in that, Step S2 includes: At the start of the breakout trigger, the spatial offset between the arc-starting position and the arc-extinguishing channel entrance is determined based on the constraint relationship; When the spatial offset is within the preset range, the moving contact is controlled to separate to form a contact gap, so that the electric arc is stably attached to the arc starting position; When the spatial offset exceeds the preset range, adjust the separation direction of the moving contact so that the separation trajectory tends to the entrance of the arc extinguishing channel; After the contact gap is formed, its lateral expansion trend is determined based on the change in the arc attachment position, and the arc is controlled to stretch along the contact separation direction. When the arc extends along the contact separation direction and approaches the entrance of the arc extinguishing channel, the separation stroke and separation speed are coordinated so that the leading edge of the arc enters the entrance of the arc extinguishing channel and forms a continuous migration path; Before the electric arc enters the arc-extinguishing channel entrance, the moving contact separation direction is kept consistent with the continuous migration path until the electric arc completes its directional migration from the arc-starting position to the arc-extinguishing channel entrance.

3. The intelligent disconnection control method for a DC contactor according to claim 2, characterized in that, When the spatial offset is within a preset range, controlling the moving contact to separate to form a contact gap, so that the arc is stably attached to the arc starting position includes: When the spatial offset is within the preset range, the moving contact is driven to separate according to the preset separation stroke increment, and an arc contact gap is established between the moving contact and the stationary contact. During the arc contact gap expansion process, the separation stroke increment is controlled to maintain a corresponding relationship with the separation speed, and the arc is anchored in the area corresponding to the arc starting position. When the arc contact gap reaches the preset gap range, the separation stroke increment remains unchanged and the separation speed change is limited, controlling the contact gap to gradually form and maintaining the arc attached to the arc starting position.

4. The intelligent disconnection control method for a DC contactor according to claim 2, characterized in that, When the spatial offset exceeds the preset range, the separation direction of the moving contact is adjusted so that the separation trajectory tends towards the entrance of the arc extinguishing channel, including: When the spatial offset exceeds the preset range, the offset direction of the moving contact separation direction relative to the arc extinguishing channel inlet position is obtained, and the lateral offset state is determined. Adjust the separation motion of the moving contact along the lateral offset trend, and superimpose a lateral component on the moving contact; During the separation process, the change in the attachment position of the electric arc in the contact gap is monitored simultaneously, and the transverse component is corrected based on the change in the attachment position. When the arc front enters the entrance region of the arc extinguishing channel, the lateral component is weakened while maintaining the current separation direction.

5. The intelligent disconnection control method for a DC contactor according to claim 3, characterized in that, When the spatial offset exceeds the preset range, the offset direction of the moving contact separation direction relative to the arc extinguishing channel inlet position is obtained, and the lateral offset trend is determined, including: When the spatial offset exceeds the preset range, select two consecutive positions before and after the moving contact separation direction, obtain the relative orientation of the moving contact edge and the arc extinguishing channel entrance position at each position, and record the change results of the relative orientation. Based on the changes in relative orientation, the degree of deviation of the moving contact from the entrance position of the arc-extinguishing channel during the separation process is determined, and the degree of deviation is corresponding to the lateral offset state.

6. The intelligent disconnection control method for a DC contactor according to claim 2, characterized in that, After the contact gap is formed, the lateral expansion trend is determined based on the change in the arc attachment position, and the arc stretching along the contact separation direction is controlled, including: After the contact gap is formed, the attachment position of the electric arc on the surfaces of the moving contact and the stationary contact is obtained along the contact separation direction and the contact width direction. Based on the continuous offset of the attachment position in the contact width direction, the lateral expansion state of the arc relative to the arcing start position is determined; When the separation is determined to be in a lateral expansion state, the time interval corresponding to the separation stroke is shortened and the separation speed is adjusted to a preset speed range while keeping the separation direction unchanged; When the attachment position shifts from the contact width direction to extending along the contact separation direction, the current separation speed is maintained.

7. The intelligent disconnection control method for a DC contactor according to claim 2, characterized in that, When the arc extends along the contact separation direction and approaches the entrance of the arc-extinguishing channel, coordinating the separation stroke and separation speed to ensure the arc front enters the entrance of the arc-extinguishing channel and forms a continuous migration path includes: When the arc extends along the contact separation direction and approaches the entrance of the arc extinguishing channel, the relative positional relationship between the arc front and the entrance boundary of the arc extinguishing channel is obtained, and the entrance alignment interval corresponding to the arc front is determined. When the arc front enters the entrance alignment zone, the matching relationship between the separation stroke and the separation speed is adjusted according to the relative position relationship to control the separation direction of the arc front contact to align with the entrance of the arc extinguishing channel; After aligning the arc front with the arc extinguishing channel entrance, the separation direction remains unchanged and the separation speed is adjusted to the preset propulsion speed, so that the arc front crosses the entrance boundary and enters the arc extinguishing channel, forming a continuous migration path along the constraint path.

8. The intelligent disconnection control method for a DC contactor according to claim 1, characterized in that, Step S3 includes: After the electric arc enters the arc extinguishing channel entrance, the channel is divided into sections according to the geometric parameters of the arc extinguishing channel, and the position of the grid gap and the channel cross-sectional range in each channel section are obtained. Based on the spatial position of the electric arc when it enters the channel section, the distribution range of the electric arc within the channel cross section is defined, and the electric arc extension path is formed along the channel extension direction; As the electric arc extends along the channel section, when the arc crosses the gap between the grid plates, the arc is segmented based on the structural boundaries on both sides of the gap between the grid plates, resulting in multiple arc columns in different channel sections.

9. The intelligent disconnection control method for a DC contactor according to claim 8, characterized in that, As the electric arc extends along the channel segment, when it crosses the gap between the grid plates, the arc is segmented based on the structural boundaries on both sides of the gap, resulting in multiple arc columns in different channel segments, including: During the extension of the electric arc along the channel section, when the leading edge of the electric arc enters the range of the grid gap, the relative positional relationship between the leading edge of the electric arc and the structural boundaries on both sides of the grid gap is obtained, and it is determined that the electric arc is in a state of crossing the grid gap. When the electric arc is in a state of crossing the gap between the grid plates, the electric arc is divided based on the structural boundaries on both sides of the gap between the grid plates, and corresponding arc segments are formed before and after the gap between the grid plates respectively; After the arc segments are formed, each arc segment is assigned to an adjacent channel segment according to the position of the grid gap in the channel segment, and the distribution position of each arc segment in the corresponding channel segment is determined, forming an arc column sequence distributed along multiple channel segments.

10. A DC contactor intelligent disconnection control system, characterized in that, The system includes a main body of a DC contactor intelligent disconnection control system, a power supply unit, and an electrical control unit. The power supply unit is installed inside the main body of the DC contactor intelligent disconnection control system, and the electrical control unit is electrically connected to the power supply unit. The electrical control unit is used to charge the main body of the DC contactor intelligent disconnection control system and control the main body of the DC contactor intelligent disconnection control system. The electrical control unit is used to execute the intelligent disconnection control method for the DC contactor as described in claim 1. The electrical control unit includes: The constraint path determination module is used to obtain the contact structure parameters of the moving contact and the stationary contact, as well as the geometric parameters of the arc extinguishing channel; determine the arc starting position based on the contact structure parameters, and determine the constraint path of the arc in the arc extinguishing channel in combination with the geometric parameters of the arc extinguishing channel, thus establishing the constraint relationship between the arc starting position and the constraint path. The moving contact adjustment module is used to adjust the separation stroke and separation speed of the moving contact according to the constraint relationship during the breaking triggering process, so that the arc moves directionally from the arc starting position along the constraint path to the arc extinguishing channel entrance. The multi-segment arc column determination module is used to divide the channel into segments based on the geometric parameters of the arc extinguishing channel after the electric arc enters the arc extinguishing channel, and to determine the multi-segment arc columns of different channel segments using each channel segment; The arc extinguishing and disconnecting module is used to maintain the contact gap and block the arc return path when each arc column is extinguished in sequence within the preset arc-breaking section during the advancement of multiple arc columns along the channel section, so that the arc extinguishing and disconnection are completed.

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