A multi-redundancy bypass switch and a control method thereof

Abstract

The application discloses a kind of multi-redundancy bypass switch and its control method, belong to direct current transmission technical field, bypass switch includes through-flow module, including respectively opposite setting movable contact and static contact, auxiliary movable contact and auxiliary static contact;Dual-drive execution module contains two independently arranged and output end is jointly connected in the input end of a differential link;The differential link has the first output end and the second output end of different linear output stroke, the first output end is connected with movable contact, for driving movable contact linear motion;Second output end is connected with auxiliary movable contact, for driving auxiliary movable contact linear motion;The linear output stroke of second output end is more than the first output end;Dual-source power supply module is used to power two drive units respectively;State feedback module is used to detect and feedback the action state of each drive unit and movable contact displacement. The closing speed is improved, the rebound time is reduced, and the switch system reliability is enhanced.

Description

Technical Field

[0001] This invention belongs to the field of DC power transmission technology, and particularly relates to a multi-redundancy bypass switch and its control method. Background Technology

[0002] Flexible DC transmission is a new generation of "voltage source" DC transmission technology that emerged in the 1990s. Compared with traditional "current source" DC transmission, it offers more flexible control over voltage and frequency, enabling it to support safe and stable system operation at critical moments. It is suitable for long-distance, high-capacity ultra-high voltage DC transmission projects. The highly stable and reliable converter valve is the core equipment of this technology.

[0003] The bypass switch in the flexible DC converter valve submodule plays a crucial role in fault isolation, system protection, and energy transfer. Existing bypass switches mostly employ a single-drive control structure, which suffers from long closing times and inaccurate bounce control. Furthermore, they lack reliable redundancy in control, communication, and power supply, affecting system reliability and response speed. Therefore, a novel bypass switch structure and control method are urgently needed to improve closing speed, reduce bounce, and enhance system stability. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-redundancy bypass switch and its control method. Through the dual-drive control structure of differential transmission and the optimized bounce control strategy, the closing speed is significantly improved, the bounce time is reduced, and the reliability of the system is enhanced.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution:

[0006] In a first aspect, the present invention provides a multi-redundancy bypass switch, comprising: The current-passing module includes main contacts and auxiliary contacts encapsulated inside a vacuum interrupter; the main contacts include a moving contact and a stationary contact arranged opposite each other; the auxiliary contacts include an auxiliary moving contact and an auxiliary stationary contact arranged opposite each other; the stationary contact and the auxiliary stationary contact are fixedly arranged in the same vertical direction; the moving contact and the auxiliary moving contact are arranged in the same vertical direction and move linearly in the horizontal direction; The dual-drive actuator module comprises two independently configured drive units whose output ends are connected to the input end of a differential linkage. The differential linkage has a first output end and a second output end with different linear output strokes. The first output end is connected to a moving contact and is used to drive the moving contact to move linearly. The second output end is connected to an auxiliary moving contact and is used to drive the auxiliary moving contact to move linearly. The linear output stroke of the second output end is greater than that of the first output end. The dual-source power supply module includes two independent power supply circuits that are respectively connected to the corresponding drive units to supply power to the drive units; The status feedback module includes two auxiliary switches that are linked to the corresponding drive units to detect and provide feedback on the operating status of each drive unit, and a position sensor that is positioned toward the moving contact to detect the displacement of the moving contact in real time. The control system is used to control the dual-source power supply module to supply or de-energize the dual-drive execution module; it is also used to receive the drive unit's action status and moving contact displacement status from the status feedback module, and control the output of the drive unit accordingly.

[0007] Optionally, the differential linkage includes a main push rod and a pre-contact lever; The input end of the main push rod is hinged to the input end of the pre-contact lever, the output end of the main push rod is connected to the moving contact, and the output end of the pre-contact lever is connected to the auxiliary moving contact. A sliding groove mechanism is also connected between the main push rod and the pre-contact lever; The sliding mechanism includes an elongated hole on the pre-contact lever and a pin connected to the main push rod, the pin being slidably embedded in the inner cavity of the elongated hole.

[0008] Optionally, both drive units include a magnetic cylinder and a snap-fit ​​mechanism, wherein the moving iron core of the magnetic cylinder is connected to the input end of the snap-fit ​​mechanism, and the output ends of both snap-fit ​​mechanisms are connected to the input end of the differential linkage.

[0009] Optionally, the magnetic cylinders of the two drive units are symmetrically arranged on both sides of the moving contact direction, and their center lines are parallel or coincident.

[0010] Optionally, the auxiliary switch includes an interconnected drive rod and contacts; The drive rod of each auxiliary switch is linked to the moving iron core of the corresponding magnetic cylinder or the corresponding snapping mechanism; The contacts of the two auxiliary switches are connected in series to output a double-confirmed opening and closing status signal to the external control system.

[0011] Optionally, the position sensor is a non-contact linear displacement sensor, whose measuring axis coincides with the motion axis of the moving contact.

[0012] Optionally, the bypass switch further includes an insulation support module; The insulating support module includes an insulating housing and insulators disposed within the insulating housing, used to install and insulatingly fix the current-carrying module, dual-drive execution module, dual-source power supply module and status feedback module, and to maintain the set electrical insulation and relative positional relationship between each module.

[0013] Optionally, the differential linkage further includes a moving end linkage extending in the opposite direction to the main push rod; The bypass switch also includes a buffer device sleeved on the outer periphery of the moving end connecting rod. The two ends of the buffer device abut against a limiting block on one side of the insulating housing and on the moving end connecting rod, respectively, to absorb mechanical impact during the closing process.

[0014] Optionally, a redundant path for cross-power supply is provided between the two power supply circuits.

[0015] In a second aspect, the present invention provides a control method for a multi-redundancy bypass switch applied to any of the claims in the first aspect, comprising: Closing control steps: The control system supplies power to the two drive units through the dual-source power supply module, drives the differential linkage mechanism to move, so that the auxiliary contact first contacts to form a pre-charging path, and then the main contact closes to bear the main current. The output force of the drive unit is adjusted in real time according to the displacement signal fed back by the position sensor to suppress contact bounce. The tripping control procedure is as follows: The control system cuts off the power supply from the dual-source power supply module to the drive unit, the main contacts separate first, and the auxiliary contacts separate later. Status confirmation step: The control system acquires status signals through two auxiliary switches, and confirms the operation is valid when the two signals are consistent. Compared with existing technologies, the beneficial effects achieved by this invention are as follows: Redundant design is adopted in the drive, power supply, and status feedback links, ensuring that the system will not fail even if a single component fails, thus guaranteeing the reliability of the bypass switch. This is particularly suitable for high-voltage, high-power flexible DC transmission systems. Furthermore, the dual-drive mechanism combined with differential design enables current switching from low-current pre-contact to high-current main contact, resulting in short closing time, good bounce suppression, and reduced wear on the main contacts. Dual auxiliary switches provide dual status verification, enabling timely identification of system faults. Position sensors provide real-time movement trajectory of the moving contact and feed it back to the control system, which adjusts the output of the drive unit based on the feedback to suppress bounce. The differential linkage allows the auxiliary contacts to pre-contact, and the voltage across the main contacts is lowered by the pre-charging circuit when the main contacts close, greatly reducing the closing arc energy and significantly improving electrical life. Attached Figure Description

[0016] Figure 1 The diagram shown is a structural schematic of a multi-redundancy bypass switch in one embodiment of the present invention.

[0017] Figure 2 The diagram shown is a schematic diagram of the bypass switch control logic in one embodiment of the present invention.

[0018] Figure 1In the middle section: 1. Vacuum interrupter; 2. Stationary copper busbar; 3. Moving copper busbar; 4. Stationary contact; 5. Moving contact; 6. Auxiliary stationary contact; 7. Auxiliary moving contact; 8. Main push rod; 9. Pre-contact lever; 10. Oblong hole; 11. Guide pin; 12. Moving connecting rod; 13. First closing mechanism; 14. Second closing mechanism; 15. Main magnetic cylinder; 16. Auxiliary magnetic cylinder; 17. First auxiliary switch; 18. Second auxiliary switch; 19. Position sensor; 20. Insulating housing; 21. Insulator; 22. Buffer device. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] Example 1

[0023] This embodiment provides a multi-redundancy bypass switch, specifically including a current-carrying module, a dual-drive execution module, a dual-source power supply module, a status feedback module, and an insulation support module, such as... Figure 1 As shown, the specific structure is as follows:

[0024] The current-carrying module includes a moving copper busbar 3, a stationary copper busbar 2, a moving contact 5 and a stationary contact 4 arranged opposite each other, an auxiliary moving contact 7 and an auxiliary stationary contact 6 arranged opposite each other, and a vacuum interrupter 1 encapsulating the copper busbars and contacts. The stationary contact 4 and the auxiliary stationary contact 6 are connected to the stationary copper busbar 2 and are fixedly arranged on the same vertical line of the vacuum interrupter 1. The moving contact 5 and the auxiliary moving contact 7 are connected to the moving copper busbar 3 and are arranged on the same vertical line of the vacuum interrupter 1. Both can move linearly in a direction parallel to the horizontal axis of the vacuum interrupter 1, so that the moving contact 5 contacts or separates from the stationary contact 4 to connect or disconnect the main current path, and the auxiliary moving contact 7 contacts or separates from the auxiliary stationary contact 6 to connect or disconnect the small current path.

[0025] The dual-drive execution module includes a first drive unit, a second drive unit, and a differential linkage. The first and second drive units are independently configured. The first drive unit includes a main magnetic cylinder 15 and a first closing mechanism 13, while the second drive unit includes an auxiliary magnetic cylinder 16 and a second closing mechanism 14. Both the main magnetic cylinder 15 and the auxiliary magnetic cylinder 16 are symmetrically arranged along the axis of motion of the moving contact 5, generating a coaxial thrust on the differential linkage and avoiding lateral driving force. This dual-drive cooperative structure provides power redundancy; even if one drive unit fails, the other unit can still independently complete the opening and closing operations.

[0026] The moving iron core of the main magnetic cylinder 15 is connected to the input end of the first engagement mechanism 13, and the moving iron core of the auxiliary magnetic cylinder 16 is connected to the input end of the second engagement mechanism 14. The output ends of the first engagement mechanism 13 and the second engagement mechanism 14 are hinged together to a differential linkage. The differential linkage has two output ends: the first output end is connected to the moving contact 5 and is used to drive the moving contact 5 to move linearly; the second output end is connected to the auxiliary moving contact 7 and is used to drive the auxiliary moving contact 7 to move linearly.

[0027] The differential linkage includes a main push rod 8, a pre-contact lever 9, and a sliding mechanism. The output end of the main push rod 8 is rigidly connected to the moving contact 5, and the input end is hinged to the output ends of the first closing mechanism 13 and the second closing mechanism 14. The input end of the pre-contact lever 9 is also hinged to the output ends of the first closing mechanism 13 and the second closing mechanism 14, and the output end is rigidly connected to a plurality of auxiliary moving contacts 7. The pre-contact lever 9 is also connected to the main push rod 8 through the sliding mechanism. The sliding mechanism is configured to allow the output end of the pre-contact lever 9 to undergo relative displacement with respect to the output end of the main push rod 8 during the closing action phase, thereby enabling the auxiliary contacts to close before the main contacts.

[0028] The sliding mechanism includes an elongated hole 10 formed on the pre-contact lever 9 and a guide pin 11 fixed on the main push rod 8. The free end of the guide pin 11 is nested in the elongated hole 10. The length direction of the elongated hole 10 forms an acute angle with the movement direction of the moving contact 5. The length L of the elongated hole 10 satisfies: L ≥ Δs / cosθ, where θ is the angle between the length direction of the elongated hole 10 and the movement direction of the moving contact 5, and Δs is the linear stroke of the output end of the pre-contact lever 9 before the output end of the main push rod 8.

[0029] The working principle of the differential linkage is as follows: When the drive unit drives the differential linkage to move, the main push rod 8 and the contact lever move synchronously. Due to the connection method of the sliding groove mechanism, the guide pin 11 fixed on the main push rod 8 is forced to slide obliquely downward along the hole 10 of the pre-contact lever 9, causing the pre-contact lever 9 to rotate an additional angle clockwise around the input end hinge point. This causes the output end of the pre-contact lever 9 to extend Δs in the straight line during the synchronous translation with the main push rod 8. When the sliding stroke of the guide pin 11 in the oblong hole 10 ends, the main push rod 8 and the contact lever are rigidly locked. In the subsequent synchronous translation, the output ends of the main push rod 8 and the contact lever will output the same linear stroke under the driving action of the drive unit. Therefore, in the initial stage of closing, the additional linear stroke of the pre-contact lever 9 will drive the auxiliary moving contact 7 to contact the auxiliary stationary contact 6 first, completing the pre-charging. Subsequently, the moving contact 5 contacts the stationary contact 4, and the main contact closes to complete the main current charging.

[0030] refer to Figure 2 The dual-source power supply module includes a first power supply circuit and a second power supply circuit. The output end of the first power supply circuit is connected to the coil of the main magnetic cylinder 15, and the output end of the second power supply circuit is connected to the coil of the auxiliary magnetic cylinder 16. The first power supply circuit and the second power supply circuit are independent of each other and supply power to the corresponding drive units. A cross power supply path is provided between the first power supply circuit and the second power supply circuit.

[0031] To achieve redundancy backup, a cross power supply path composed of OR-ing diodes is set at the output of the two power supply circuits. When either power supply circuit fails and there is no output, the other normal power supply can automatically switch to the two drive units to continue supplying power through the OR-ing diodes, ensuring that the switch can perform at least one complete action.

[0032] refer to Figure 2The status feedback module includes a position sensor 19 and a first auxiliary switch 17 and a second auxiliary switch 18, each independently controlled by two control modules. The drive rod of the first auxiliary switch 17 is linked to the moving iron core of the main magnetic cylinder 15 or the first closing mechanism 13, used to detect and feedback the operating state of the first drive unit. The drive rod of the second auxiliary switch 18 is linked to the moving iron core of the auxiliary magnetic cylinder 16 or the second closing mechanism 14, used to detect and feedback the operating state of the second drive unit. The contacts of the two auxiliary switches are typically connected in series to form an AND logic. Only when the signals received by the two control modules are consistent will a valid open or close position signal be sent to the controller, achieving redundant verification of signal feedback. The position sensor 19 is preferably a non-contact linear displacement sensor, fixedly installed aligned with the moving contact 5 or a component moving synchronously with the moving contact 5. Its detection axis coincides with the movement axis of the moving contact 5, used to detect and output the displacement signal of the moving contact 5 in real time, and feed the signal back to the controller, providing a data basis for achieving closed-loop bounce suppression.

[0033] The insulating support module includes an insulating housing 20 and an insulator 21 disposed inside it. The current-carrying module, dual-drive execution module, dual-source power supply module and status feedback module are all fixedly installed on the insulating support module. The insulator 21 maintains the required electrical insulation and relative positional relationship between the modules, ensuring that the relative positions of components such as contacts, magnetic cylinders, connecting rods and sensors are stable and reliable, and meeting the high-voltage insulation requirements.

[0034] In this embodiment, the insulating support module adopts a drawer-type slide rail design, which allows the current-carrying module and the dual-drive execution module to be pulled out as a whole along the slide rail, facilitating uninterrupted maintenance and greatly improving the maintainability and availability of the equipment.

[0035] In this embodiment, the differential linkage further includes a moving end linkage 12. One end of the moving end linkage 12 is connected to the input end of the main push rod 8. The outer ring of the other end of the moving end linkage 12 is fitted with a buffer device 22. The two ends of the buffer device 22 abut against one side of the insulating housing 20 and a limiting block (not shown in the figure) on the moving end linkage 12, respectively, to absorb the mechanical impact energy at the closing end, suppress bounce, and provide initial acceleration force when opening.

[0036] Example 2

[0037] This embodiment provides a control method for the multi-redundancy bypass switch described in Embodiment 1, including the following steps:

[0038] Assembly and debugging steps: Assemble the current-carrying module, dual-drive execution module, dual-source power supply module, status feedback module and buffer device 22 onto the insulating support module respectively. Adjust the length of the long round hole 10 in the differential connecting rod and the matching relationship with the guide pin 11 to ensure that the auxiliary contact contacts 1-2ms earlier than the main contact, and ensure that the initial air gap of the two drive units is consistent.

[0039] Closing control steps: After the controller issues a closing command, the dual-source power supply module synchronously supplies power to the two drive units. The drive unit pushes the auxiliary contact to close first through the differential linkage, forming a pre-charging path; subsequently, the main contact closes quickly, bearing the main current. During the movement of the main contact, the position sensor 19 monitors the displacement in real time. Once a slight rebound is detected after the contact closes, the control system immediately dynamically adjusts the current output of the drive unit, forming a closed-loop negative feedback control to suppress bouncing.

[0040] The tripping control steps are as follows: The control system cuts off the power supply to the drive unit of the two power supply circuits. Under the restoring force provided by the buffer device 22, the moving contact 5 first separates from the stationary contact 4, and then the auxiliary moving contact 7 separates from the auxiliary stationary contact 6, thus completing the tripping.

[0041] Status confirmation procedure: After the opening or closing operation is completed, the first auxiliary switch 17 and the second auxiliary switch 18 respectively upload the detected status signals to the controller. The controller compares the two signals, and only when the two signals match is the operation confirmed as successful and valid.

[0042] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A multi-redundancy bypass switch, comprising: include: The current-passing module includes main contacts and auxiliary contacts encapsulated inside a vacuum interrupter; the main contacts include a moving contact and a stationary contact arranged opposite each other; the auxiliary contacts include an auxiliary moving contact and an auxiliary stationary contact arranged opposite each other; the stationary contact and the auxiliary stationary contact are fixedly arranged in the same vertical direction; the moving contact and the auxiliary moving contact are arranged in the same vertical direction and move linearly in the horizontal direction; The dual-drive actuator module comprises two independently configured drive units whose output ends are connected to the input end of a differential linkage. The differential linkage has a first output end and a second output end with different linear output strokes. The first output end is connected to a moving contact and is used to drive the moving contact to move linearly. The second output end is connected to an auxiliary moving contact and is used to drive the auxiliary moving contact to move linearly. The linear output stroke of the second output end is greater than that of the first output end. The dual-source power supply module includes two independent power supply circuits that are respectively connected to the corresponding drive units to supply power to the drive units; The status feedback module includes two auxiliary switches that are linked to the corresponding drive units to detect and provide feedback on the operating status of each drive unit, and a position sensor that is positioned toward the moving contact to detect the displacement of the moving contact in real time. The control system is used to control the dual-source power supply module to supply or de-energize the dual-drive execution module; it is also used to receive the drive unit's action status and moving contact displacement status from the status feedback module, and control the output of the drive unit accordingly. The differential linkage includes a main push rod and a pre-contact lever; The input end of the main push rod is hinged to the input end of the pre-contact lever, the output end of the main push rod is connected to the moving contact, and the output end of the pre-contact lever is connected to the auxiliary moving contact. A sliding groove mechanism is also connected between the main push rod and the pre-contact lever; The sliding mechanism includes an elongated hole on the pre-contact lever and a pin connected to the main push rod, the pin being slidably embedded in the inner cavity of the elongated hole.

2. The multi-redundancy bypass switch according to claim 1, characterized in that, Both drive units include a magnetic cylinder and a snap-fit ​​mechanism. The moving iron core of the magnetic cylinder is connected to the input end of the snap-fit ​​mechanism, and the output ends of both snap-fit ​​mechanisms are connected to the input end of the differential linkage.

3. The multi-redundancy bypass switch according to claim 2, characterized in that, The magnetic cylinders of the two drive units are symmetrically arranged on both sides of the moving contact direction, and their center lines are parallel or coincident.

4. The multi-redundancy bypass switch according to claim 2, characterized in that, The auxiliary switch includes interconnected drive rods and contacts; The drive rod of each auxiliary switch is linked to the moving iron core of the corresponding magnetic cylinder or the corresponding snapping mechanism; The contacts of the two auxiliary switches are connected in series to output a double-confirmed opening / closing status signal to the control system.

5. The multi-redundancy bypass switch according to claim 1, characterized in that, The position sensor is a non-contact linear displacement sensor, and its measuring axis coincides with the motion axis of the moving contact.

6. The multi-redundancy bypass switch according to claim 1, characterized in that, It also includes an insulation support module; The insulating support module includes an insulating housing and insulators disposed within the insulating housing, used to install and insulatingly fix the current-carrying module, dual-drive execution module, dual-source power supply module and status feedback module, and to maintain the set electrical insulation and relative positional relationship between each module.

7. The multi-redundancy bypass switch according to claim 6, characterized in that, The differential linkage also includes a moving end linkage extending in the opposite direction to the main push rod; The bypass switch also includes a buffer device sleeved on the outer periphery of the moving end connecting rod. The two ends of the buffer device abut against a limiting block on one side of the insulating housing and on the moving end connecting rod, respectively, to absorb mechanical impact during the closing process.

8. The multi-redundancy bypass switch according to claim 1, characterized in that, A redundant path for cross-power supply is provided between the two power supply circuits.

9. A control method for a multi-redundancy bypass switch as described in any one of claims 1-8, characterized in that, include: Closing control steps: The control system supplies power to the two drive units through the dual-source power supply module, drives the differential linkage to move, so that the auxiliary contact first contacts to form a pre-charging path, and then the main contact closes to bear the main current. The output force of the drive unit is adjusted in real time according to the displacement signal fed back by the position sensor to suppress contact bounce. The tripping control procedure is as follows: The control system cuts off the power supply from the dual-source power supply module to the drive unit, the main contacts separate first, and the auxiliary contacts separate later. Status confirmation step: The control system acquires status signals through two auxiliary switches and confirms the operation is valid when the two signals are consistent.

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