Transmission system and method for mechanical part and power electronic assembly

Abstract

The present disclosure relates to the technical field of switch control. Disclosed are a transmission system and method for a mechanical part and a power electronic assembly. The system comprises: a mechanical transmission shaft, a starting signal generator and a control unit, wherein the starting signal generator comprises a turntable and at least one optical fiber collimator; one end of the mechanical transmission shaft is connected to the mechanical part of a power electronic on-load tap-changer, and the other end of the mechanical transmission shaft is connected to the turntable, the mechanical transmission shaft being configured, when the mechanical part is in action, to drive the turntable to rotate; and the control unit controls, on the basis of the state of a received optical signal, whether to trigger the power electronic assembly of the power electronic on-load tap-changer. The present disclosure utilizes the advantages of stable transmission and strong anti-interference capability of an optical signal, and achieves, by means of identifying changes in the optical signal, real-time monitoring of the mechanical state, thus providing an action starting reference point for coordinated control of action timing, improving the accuracy and reliability of controlling the triggering of the power electronic assembly.

Description

A transmission system and method for mechanical parts and power electronic components

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on and claims the priority of Chinese patent application with application number 202410131323.8 and application date of January 30, 2024. The entire contents of the Chinese patent application are hereby introduced into this disclosure in their entirety. Technical Field

[0003] The present disclosure relates to the field of switch control technology, and in particular to a transmission system and method for a mechanical part and a power electronic component. Background Art

[0004] Power electronic on-load tap-changers consist of mechanical components and power electronic components, typically mechanical switches and semiconductor components. Mechanical switches exhibit millisecond-level actuation errors, driven by the rapid release of a spring-loaded mechanism. This makes the switching process uncontrollable. Semiconductor components, on the other hand, achieve microsecond-level control via a driver board, enabling real-time control of the switching process. Ensuring that the millisecond-level mechanical switches and microsecond-level semiconductor components complete their switching actions strictly according to the set timing is a pressing challenge. The start signal generator provides the starting signal for the semiconductor components to operate, serving as the link between the semiconductor components and the mechanical switching switch, determining the proper functioning of the switching sequence. The start signal must be accurate and reliable. Excessive errors can cause misalignment between the semiconductor and mechanical switches, leading to serious failures. Therefore, accurate and reliable acquisition of this signal is crucial.

[0005] To address these issues, research on accurate, reliable, and low-error starting signal generators has become a hot topic. Currently, the main types of starting signal generators include pendulums, pulleys, and gears. Pendulums experience severe up-and-down vibration during switching; pulleys have long ropes that easily deform after repeated switching, causing significant errors; and gears are bulky and difficult to secure. Consequently, existing starting signal generators have limited accuracy and reliability in controlling the triggering of power electronic components.

[0006] Summary of the Invention

[0007] In view of this, the present disclosure provides a transmission system and method for a mechanical part and a power electronic component to solve the technical problem of poor accuracy and reliability in controlling the triggering of the power electronic component in the existing solution.

[0008] In a first aspect, the present disclosure provides a transmission system for a mechanical part and a power electronic component, comprising: a mechanical transmission shaft, a start signal generator, and a control unit, wherein the start signal generator comprises a turntable and at least one optical fiber collimator; one end of the mechanical transmission shaft is connected to the mechanical part of the power electronic on-load tap changer, and the other end is connected to the turntable, and the mechanical transmission shaft is used to drive the turntable to rotate when the mechanical part is actuated; the turntable is further provided with a through hole corresponding to the optical fiber collimator, and the optical fiber collimator comprises a transmitting optical head and a receiving optical head, wherein the transmitting optical head and the receiving optical head are connected to each other. The optical heads are respectively arranged on both sides of the corresponding through holes. When the mechanical part is in a stationary state, the light beam sent by the transmitting optical head is received by the receiving optical head through the corresponding through hole, and the receiving optical head sends the received optical signal to the control unit. When the mechanical part is in a gear switching state, the mechanical transmission shaft drives the turntable to rotate, and the relative position of the fiber collimator and the corresponding through hole changes, so that the light beam sent by the transmitting optical head is blocked by the turntable; the control unit controls whether to trigger the power electronic component of the power electronic on-load tap changer according to the state of the received optical signal.

[0009] In some embodiments, a first preset number of the optical fiber collimators and the through holes are provided, and the control unit controls whether to trigger the power electronic components of the power electronic on-load tap changer according to the state of the received optical signal, including: the control unit controls the triggering of the power electronic components of the power electronic on-load tap changer when the state of the optical signals of at least a second preset number of the optical fiber collimators changes from a light-on state to a light-off state according to the state of the received optical signal; wherein the second preset number is less than the first preset number, and the first preset number is greater than or equal to two.

[0010] In some embodiments, the first preset number is four, the second preset number is two, the through holes on the turntable are arranged at 90° intervals, and the moment when the power electronic component of the power electronic on-load tap changer is triggered is the moment when the second optical signal in chronological order is blocked.

[0011] In a second aspect, the present disclosure provides a method for transmitting a mechanical part and a power electronic component, which is applied to a control unit in a transmission system of a mechanical part and a power electronic component as described in the first aspect. The method for transmitting the mechanical part and the power electronic component includes: controlling whether to trigger the power electronic component of the power electronic on-load tap changer according to the state of the optical signal sent by the optical fiber collimator.

[0012] In some embodiments, controlling whether to trigger the power electronic component of the power electronic on-load tap changer according to the state of the optical signal sent by the optical fiber collimator includes: controlling the power electronic component of the power electronic on-load tap changer to be triggered when the state of the optical signal sent by at least a second preset number of the optical fiber collimators changes from a light-on state to a light-off state according to the state of the optical signal sent by the optical fiber collimator; wherein a first preset number of the optical fiber collimators and the through-holes are each provided, the second preset number is less than the first preset number, and the first preset number is greater than or equal to two.

[0013] In some embodiments, the first preset number is four, the second preset number is two, and the moment of triggering the power electronic component of the power electronic on-load tap changer is the moment when the optical signal is blocked second in chronological order.

[0014] In some embodiments, before controlling whether to trigger the power electronic components of the power electronic on-load tap changer according to the state of the optical signal sent by the optical fiber collimator, it includes: setting a de-bouncing time of a first preset time length for the optical signal sent by each optical fiber collimator when it changes from a light state to a light-off state, and taking the moment when the optical signal detected as being in a light-off state after the de-bouncing time has passed as the moment when the optical signal is blocked.

[0015] In some embodiments, after controlling whether to trigger the power electronic component of the power electronic on-load tap changer according to the state of the optical signal sent by the optical fiber collimator, the method includes: after the power electronic component controlling the power electronic on-load tap changer is triggered and the switching is completed, each of the optical signals is detected within a second preset time period, and if the number of the optical signals detected in the light-on state is less than a third preset number, a fault alarm is initiated.

[0016] In some embodiments, the time obtained by adding the third preset time duration to the time when the power electronic component controlling the power electronic on-load tap changer is triggered is used as the time when the switching is completed.

[0017] In some embodiments, the second preset duration is 180ms-220ms, the third preset duration is 100ms-120ms, and the third preset number is two.

[0018] It can be seen from the above technical solutions that the embodiments of the present disclosure have the following advantages:

[0019] The present disclosure provides a transmission system and method for a mechanical part and a power electronic component. The system comprises a start signal generator including a turntable and at least one fiber optic collimator. One end of a mechanical transmission shaft is connected to the mechanical part of the power electronic on-load tap changer, and the other end is connected to the turntable. The mechanical transmission shaft is used to drive the turntable to rotate when the mechanical part operates. The turntable is also provided with a through hole corresponding to the fiber optic collimator. The fiber optic collimator includes a transmitting optical head and a receiving optical head, which are respectively disposed on either side of the corresponding through hole. When the mechanical part is stationary, a light beam transmitted by the transmitting optical head passes through the corresponding through hole and is received by the receiving optical head. The receiving optical head then transmits the received optical signal to a control unit. The control unit controls the triggering of the power electronic component based on the received optical signal, driving the turntable to rotate when the mechanical part switches. The fiber optic collimator undergoes a change from light on, to light off, and then back to light on. Leveraging the advantages of stable optical signal transmission and strong anti-interference properties, the system monitors the mechanical state in real time by identifying optical signal changes, providing an action starting reference point for coordinated action sequence control, and improving the accuracy and reliability of controlling the triggering of the power electronic component. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] FIG1 is a schematic structural diagram of a transmission system of a mechanical part and a power electronic component according to an embodiment of the present disclosure;

[0022] FIG2 is a top view of the turntable according to an embodiment of the present disclosure;

[0023] FIG3 is a schematic structural diagram of a fiber collimator according to an embodiment of the present disclosure;

[0024] FIG4 is a schematic diagram of the operation logic of a 4-way optical fiber collimator according to an embodiment of the present disclosure;

[0025] FIG5 is a schematic diagram of the operation logic of another 4-way fiber collimator according to an embodiment of the present disclosure.

[0026] Reference numerals: 10: control unit; 11: mechanical transmission shaft; 12: turntable; 13: optical fiber collimator; 20: rotating main shaft; 21: through hole. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present disclosure.

[0028] To address the issues of high vibration intensity, high processing difficulty, difficult installation, and difficulty in coordinating and stably controlling the mechanical parts of power electronic on-load tap changers, the present disclosure proposes a transmission system for the mechanical parts and power electronic components, as shown in Figures 1, 2, and 3. The system includes:

[0029] Mechanical transmission shaft 11, control unit 10, starting signal generator including turntable 12 and at least one optical fiber collimator 13;

[0030] One end of the mechanical transmission shaft 11 is connected to the mechanical part of the power electronic on-load tap changer, and the other end is connected to the turntable 12. The mechanical transmission shaft 11 is used to drive the turntable 12 to rotate when the mechanical part is in operation;

[0031] The turntable 12 is further provided with a through hole 21 corresponding to the fiber collimator 13. The fiber collimator 13 includes a transmitting optical head and a receiving optical head, which are respectively arranged on both sides of the corresponding through hole 21. When the mechanical part is in a stationary state, the light beam sent by the transmitting optical head is received by the receiving optical head through the corresponding through hole 21, and the receiving optical head sends the received light signal to the control unit 10. When the mechanical part is in a gear switching state, the mechanical transmission shaft 11 drives the turntable 12 to rotate, and the relative position of the fiber collimator 13 and the corresponding through hole 21 changes, so that the light beam sent by the transmitting optical head is blocked by the turntable 12.

[0032] The control unit 10 controls whether to trigger the power electronic components of the power electronic on-load tap changer according to the state of the received optical signal.

[0033] Specifically, the mechanical part mainly includes mechanical switches, and the power electronic components mainly include semiconductor components.

[0034] As the link between the power electronic components and the mechanical part, the starting signal generator provides a reliable and accurate starting signal for the power electronic components to operate, ensuring that the switching timing between the mechanical part and the power electronic components is not misaligned, thus avoiding the occurrence of faults.

[0035] A circular hole is provided at the center of the turntable 12 , and the turntable 12 is connected to the mechanical transmission shaft 11 of the mechanical part of the power electronic on-load tap changer through the circular hole.

[0036] The diameter of the through hole 21 corresponding to each fiber optic collimator 13 can theoretically be 1 mm (spot diameter), but due to installation errors and rotation errors, it is necessary to consider enlarging the through hole 21 to include the above errors. The maximum thickness of the turntable 12 cannot exceed 6 mm (air gap in the optical channel), and the minimum value must ensure that it will not deform after multiple rotations. The material of the turntable 12 must ensure that it can block light with a wavelength of 850 nm. If it is metal, equipotential connection must be considered. Try to choose a material with light weight and low inertia for the turntable 12 to achieve a lightweight design. When installing the turntable 12, ensure that it cooperates with the mechanical transmission shaft 11 and the fiber optic collimator 13, and the detection error does not exceed the range after multiple actions.

[0037] The mechanical structure of the optical fiber collimator 13 mainly includes a flange, a mirror, metal parts and a multimode optical fiber. The multimode optical fiber includes a transmitting optical head and a receiving optical head.

[0038] The main mechanical components of the fiber collimator 13 are composed of two flanges, two mirrors, and metal parts. The optical fiber used is a 62.5µm / 125µm multimode fiber with a wavelength of 850nm. After the light passes through the fiber, it is reflected within the mirrors, which are approximately 5mm long, and can then pass through an air gap of 6-8mm.

[0039] The controller uses a VBC control board, and the optical signal from the fiber collimator 13 is fed back to the VBC control board for logic analysis. When the mechanical part is in motion, the mechanical drive shaft 11 rotates the turntable 12, and the optical signal sent by the fiber collimator 13 changes from light to darkness. After the mechanical part completes its motion, the mechanical drive shaft 11 rotates a certain angle and then stops. The rotation angle depends on the number of fiber collimators 13; a larger number of fiber collimators results in a smaller rotation angle. After the mechanical part completes its motion, the fiber collimator 13 moves from the previous through-hole 21 position to the next through-hole 21 position, and the optical signal sent by the fiber collimator 13 changes from darkness to light. Throughout the entire motion process, the optical signal sent by the fiber collimator 13 changes from light to darkness and then back to light. The moment when the fiber collimator 13 changes from light to darkness is selected as the starting point for the power electronic component to start its motion, controlling the triggering of the power electronic component and completing the transmission from the mechanical part to the power electronic component.

[0040] Taking advantage of the stable transmission and strong anti-interference capabilities of optical signals, real-time monitoring of mechanical status can be achieved through optical signals, providing a starting reference point for the coordinated control of the action timing of the mechanical parts and power electronic components.

[0041] The present disclosure provides a transmission system of a mechanical part and a power electronic component. The system includes a turntable 12 and a start signal generator of at least one optical fiber collimator 13. One end of a mechanical transmission shaft 11 is connected to the mechanical part of the power electronic on-load tap changer, and the other end is connected to the turntable 12. The mechanical transmission shaft 11 is used to drive the turntable 12 to rotate when the mechanical part is in motion. The turntable 12 is also provided with a through hole 21 corresponding to the optical fiber collimator 13. The optical fiber collimator 13 includes a transmitting optical head and a receiving optical head. The transmitting optical head and the receiving optical head are respectively arranged on both sides of the corresponding through hole 21. When the mechanical part is stationary, the optical fiber collimator 13 is connected to the turntable 12. When in the on / off state, the light beam sent by the transmitting optical head is received by the receiving optical head through the corresponding through hole 21, and the receiving optical head sends the received optical signal to the control unit 10. The control unit 10 controls the triggering of the power electronic component according to the received optical signal, drives the turntable 12 to rotate when the mechanical part switches, and the optical fiber collimator 13 undergoes a change process from light to no light and then to light. By utilizing the advantages of stable optical signal transmission and strong anti-interference, the real-time monitoring of the mechanical state is realized by identifying the change of the optical signal, providing an action starting reference point for the coordinated control of the action timing, and improving the accuracy and reliability of controlling the triggering of the power electronic component.

[0042] In some embodiments, the optical fiber collimator 13 and the through hole 21 are each provided with a first preset number, and the control unit 10 controls whether to trigger the power electronic component of the power electronic on-load tap changer according to the state of the received optical signal, including:

[0043] The control unit 10 controls the power electronic components of the power electronic on-load tap changer to trigger when the states of the optical signals of at least a second preset number of optical fiber collimators 13 change from the light state to the light-off state according to the state of the received optical signal;

[0044] The second preset number is smaller than the first preset number, and the first preset number is greater than or equal to two.

[0045] Specifically, when the mechanical portion, i.e., the mechanical switch, is in a stationary, unswitched state, the fiber collimator 13 transmits a constant optical signal from the optical head. This signal, after passing through the fiber collimator 13, returns to the corresponding receiving optical head. At this point, the optical signal is in a live state. When the mechanical switch is switched, the mechanical portion actuates, rotating the mechanical transmission shaft 11, which is connected to the turntable 12. This shaft drives the light shielding plate on the turntable 12 to rotate. The fiber collimator 13 remains stationary, blocking the light beam. At this point, the optical signal received by the fiber collimator 13 switches from a live state to a dead state.

[0046] The first preset number can be 2, 4, 6, 8, etc., and the corresponding second preset number can be 1, 3, 5, 7, etc. By setting logic trigger conditions such as two-choose-one and four-choose-two, redundancy is increased to ensure reliable, effective and stable switching of the power electronic on-load tap changer.

[0047] Furthermore, the first preset number is four, the second preset number is two, the through holes 21 on the turntable 12 are arranged at 90° intervals, and the moment when the power electronic component of the power electronic on-load tap changer is triggered is the moment when the second optical signal in chronological order is blocked.

[0048] Specifically, the laser collimator is provided with 4 channels, which are respectively arranged at the through holes 21 at the 4 positions (position 1, position 2, position 3, and position 4 as shown in FIG2 ) of the turntable 12, and each through hole 21 is arranged at 90° intervals. The 4-channel transmitting optical heads of the fiber optic collimator 13 send regular optical signals, which return to the 4 corresponding receiving optical heads after passing through the fiber optic collimator 13. The 4-channel interface is redundant. When the mechanical switch is in a static and unswitched state, the control unit 10 should receive 4-channel optical signals in the initial normal state. When the mechanical switch gear is switched, the mechanical part is actuated and the mechanical transmission shaft 11 rotates 90°. The mechanical transmission shaft 11 is connected to the turntable rotation main shaft 20. The mechanical transmission shaft 11 drives the turntable 12 to rotate 90°. The fiber optic collimator 13 is fixed and does not move. The 4-channel fiber optic collimator 13 signals received by the control unit 10 are changed from a light state to a lightless state. Due to consistency issues in the mechanical design, the fiber optic collimator 13 cannot block four optical signals at the same time. To prevent jitter at the startup switching moment, the fiber optic collimator 13 is designed to have a de-jitter time of 100us during startup. After the de-jitter is completed, the interface board of the fiber optic collimator 13 will respectively detect whether the four interfaces are blocked by optical signals, and sort the blocked optical signals in chronological order. The "four-out-of-two" logical judgment result is used as the triggering condition for electronic power components such as thyristors, and the moment when the second optical signal in chronological order is blocked is used as the triggering moment, which can reduce the error caused by inconsistent vibration.

[0049] The present disclosure also provides a transmission method for a mechanical part and a power electronic component, which is applied to the control unit 10 in the transmission system of the mechanical part and the power electronic component. The transmission method for the mechanical part and the power electronic component includes:

[0050] Whether to trigger the power electronic components of the power electronic on-load tap changer is controlled according to the state of the optical signal sent by the optical fiber collimator 13 .

[0051] When the mechanical part is in motion, the mechanical transmission shaft 11 drives the turntable 12 to rotate, and the state of the optical signal sent by the fiber optic collimator 13 changes from light to no light; after the mechanical part completes the action, the mechanical transmission shaft 11 stops rotating after a certain angle. The angle of rotation depends on the number of fiber optic collimators 13. The greater the number, the smaller the angle of rotation should be set. After the mechanical part completes the action, the fiber optic collimator 13 should be transferred from the previous through hole 21 position to the next through hole 21 position, and the state of the optical signal sent by the fiber optic collimator 13 changes from no light to light; during the entire action process, the state of the optical signal sent by the fiber optic collimator 13 changes from light to no light and then to light. The moment when the fiber optic collimator 13 changes from the light state to the no light state is selected as the starting moment for the power electronic component to start the action, control the triggering of the power electronic component, and complete the transmission from the mechanical part to the power electronic component.

[0052] Taking advantage of the stable transmission and strong anti-interference capabilities of optical signals, real-time monitoring of mechanical status can be achieved through optical signals, providing a starting reference point for the coordinated control of the action timing of the mechanical parts and power electronic components.

[0053] In some embodiments, the power electronic component of the power electronic on-load tap changer is controlled to trigger according to the state of the optical signal sent by the optical fiber collimator 13, including:

[0054] According to the state of the optical signal sent by the optical fiber collimator 13, when the state of the optical signal of at least a second preset number of optical fiber collimators 13 changes from the light state to the light-off state, controlling the power electronic component of the power electronic on-load tap changer to trigger;

[0055] The optical fiber collimator 13 and the through hole 21 are both provided with a first preset number, the second preset number is smaller than the first preset number, and the first preset number is greater than or equal to two.

[0056] Specifically, the first preset number can be 2, 4, 6, 8, etc., and the corresponding second preset number can be 1, 3, 5, 7, etc. By setting logical trigger conditions such as two-choose-one and four-choose-two, redundancy is increased, ensuring reliable, effective and stable switching of the power electronic on-load tap changer.

[0057] In some embodiments, the first preset number is four, the second preset number is two, and the moment when the power electronic component of the power electronic on-load tap changer is triggered is the moment when the second optical signal in chronological order is blocked.

[0058] Specifically, the laser collimator is provided with 4 channels, which are respectively arranged at the through holes 21 at the 4 positions of the turntable 12, and each through hole 21 is arranged at an interval of 90°. The 4-channel transmitting optical head of the fiber optic collimator 13 sends a regular optical signal, which returns to the 4 corresponding receiving optical heads after passing through the fiber optic collimator 13. The 4-channel interface is redundant. When the mechanical switch is in a static and unswitched state, the control unit 10 should receive 4 optical signals in the initial normal state. When the mechanical switch gear is switched, the mechanical part moves and the mechanical transmission shaft 11 rotates 90°. The mechanical transmission shaft 11 is connected to the turntable rotation main shaft 20. The mechanical transmission shaft 11 drives the turntable 12 to rotate 90°. The fiber optic collimator 13 is fixed and does not move. The 4-channel fiber optic collimator 13 signals received by the control unit 10 are changed from a light state to a lightless state. Due to consistency issues in the mechanical design, the fiber optic collimator 13 cannot block four optical signals at the same time. The interface board of the fiber optic collimator 13 will respectively detect whether the four interfaces are blocked by optical signals, and sort the blocked optical signals in chronological order. It uses the "four out of two" logical judgment result as the triggering condition for electronic power components such as thyristors, and uses the moment when the second optical signal in chronological order is blocked as the triggering moment, which can reduce the error caused by inconsistent vibration.

[0059] In some embodiments, before controlling whether to trigger the power electronic component of the power electronic on-load tap changer according to the state of the optical signal sent by the optical fiber collimator 13 , the method includes:

[0060] A debouncing time of a first preset time length is set for the optical signal sent by each optical fiber collimator 13 when the optical signal changes from the light state to the light-off state, and the moment when the optical signal detected as the light-off state after the debouncing time has passed is regarded as the moment when the optical signal is blocked.

[0061] Taking the thyristor as an electronic power component as an example, in order to prevent jitter at the startup switching moment, the de-jitter time of the fiber optic collimator 13 is designed to be 100us during startup, that is, the first preset duration is 100us. After the de-jitter is completed, the fiber optic collimator 13 interface board will respectively detect whether the four interfaces are blocked by the optical signal, and sort the blocked optical ports in chronological order, and use the "four out of two" logical judgment result as the condition for triggering the thyristor.

[0062] As shown in FIG4 , the “two out of four” logic requires that at least two optical signals among the four receiving optical ports (interface A, interface B, interface C, and interface D) are blocked. Before blocking, the receiving optical port of the optical fiber collimator 13 is in a light-on state, and after blocking, the receiving optical port of the optical fiber collimator 13 is in a light-off state. The debouncing time of the four receiving optical ports is 100 μs. The four receiving optical ports are arranged in the order of the jitter elimination completion moment as interface A, interface B, interface D, and interface C. Among the blocked optical ports, the moment of the second optical port in the order after debouncing is completed is used as the starting moment of the thyristor trigger command.

[0063] When the mechanical shaft switches, it drives the start signal generator dial 12 to rotate, and its waveform will experience a change that first jitters and then tends to be stable. It is generally believed that the jitter moment is an inherent error of the equipment system. By increasing the time method to make the jitter moment transition and then make a judgment, the purpose of reducing system errors is achieved.

[0064] In some embodiments, after controlling whether to trigger the power electronic components of the power electronic on-load tap changer according to the state of the optical signal sent by the optical fiber collimator 13 , the method includes:

[0065] After the power electronic component controlling the power electronic on-load tap changer is triggered and the switching is completed, each optical signal is detected within a second preset time period. If the number of optical signals detected to be in the light state is less than a third preset number, a fault alarm is initiated.

[0066] As shown in Figure 5, the fiber collimator interfaces in the "four-out-of-two" logic include interfaces A, B, C, and D. Before blocking, the optical receiving port of the fiber collimator 13 is in a light-receiving state; after blocking, the optical receiving port of the fiber collimator 13 is in a light-receiving state. After the control unit 10 completes the "four-out-of-two" logic judgment, it controls whether the thyristor is triggered. If the "four-out-of-two" judgment logic is met, a thyristor trigger command is issued; if not, a trip request is sent to the electrical control box, terminating the current switching.

[0067] Furthermore, the time obtained by adding the third preset time period to the time when the power electronic component that controls the power electronic on-load tap changer is triggered is used as the time when the switching is completed.

[0068] In one embodiment, the second preset time length is 180ms-220ms, the third preset time length is 100ms-120ms, and the third preset number is two. For example, as shown in Figure 5, the second preset time length is 200ms, the third preset time length is 110ms, and the third preset number is two. The switching process is considered to be completed after a delay of 110ms from the issuance of the thyristor trigger command. After a 200ms debounce, the optical port function check of the four-way fiber optic collimator 13 interface is performed. If the optical signal can be continuously detected within 200ms, the corresponding fiber optic collimator 13 functions normally. After the 110ms switching + fiber optic collimator 13 function test is completed, at least 2 optical ports should function normally, then the switching test will continue until the number of normal optical ports is detected to be less than 2, then the entire fiber optic collimator 13 is considered to be faulty, the fault information is reported, and a tripping request is made to the electrical control box to stop the next switching.

[0069] Under normal operating conditions, each switching process is carried out after the mechanical part drives the turntable 12 to rotate. The four fiber optic collimators 13 on the turntable 12 all undergo a transition from a light-on state to a light-off state and then to a light-on state. By adding a debounce time to reduce the system error caused by the mechanical equipment, the "four-out-of-two" logic is adopted to provide an accurate and reliable starting signal for the action of the power electronic switch, which greatly reduces the difficulty of timing coordination between the mechanical part and the power electronic components during the switching process.

[0070] The transmission method for the mechanical portion and power electronic components of the disclosed embodiment utilizes a well-designed start signal generator as a link between the mechanical portion and the power electronic components. To address the issue of unstable start signals, the disclosed embodiment employs multiple fiber optic collimators 13 to generate the start signals, increasing redundancy. Furthermore, optical signal transmission is stable and highly resistant to interference. This optical signal allows for real-time monitoring of the mechanical state, providing a starting reference point for coordinated control of the timing of the mechanical switch and power electronic components, ensuring safe and stable switching of the on-load tap changer.

[0071] Based on this, the operating time of each mechanical part and power electronic component is reasonably designed. By adding a debounce time, the system error caused by mechanical equipment is reduced. After switching, the fiber collimator 13 is promptly detected to see if it is faulty. This not only ensures reliable, effective and stable switching of the on-load tap changer, but also ensures that all components of the tap changer are in a safe working state, avoiding accidents.

[0072] Although the embodiments of the present disclosure have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present disclosure, and such modifications and variations are all within the scope defined by the appended claims. Industrial Applicability

[0073] The present disclosure provides a transmission system and method for a mechanical part and a power electronic component. The system comprises a start signal generator including a turntable and at least one fiber optic collimator. One end of a mechanical transmission shaft is connected to the mechanical part of the power electronic on-load tap changer, and the other end is connected to the turntable. The mechanical transmission shaft is used to drive the turntable to rotate when the mechanical part operates. The turntable is also provided with a through hole corresponding to the fiber optic collimator. The fiber optic collimator includes a transmitting optical head and a receiving optical head, which are respectively disposed on either side of the corresponding through hole. When the mechanical part is stationary, a light beam transmitted by the transmitting optical head passes through the corresponding through hole and is received by the receiving optical head. The receiving optical head then transmits the received optical signal to a control unit. The control unit controls the triggering of the power electronic component based on the received optical signal, driving the turntable to rotate when the mechanical part switches. The fiber optic collimator undergoes a change from light on, to light off, and then back to light on. Leveraging the advantages of stable optical signal transmission and strong anti-interference properties, the system monitors the mechanical state in real time by identifying optical signal changes, providing an action starting reference point for coordinated action sequence control, and improving the accuracy and reliability of controlling the triggering of the power electronic component.

Claims

1. A transmission system of a mechanical part and a power electronic component, comprising: A mechanical transmission shaft, a start signal generator and a control unit, wherein the start signal generator includes a turntable and at least one optical fiber collimator; One end of the mechanical transmission shaft is connected to the mechanical part of the power electronic on-load tap changer, and the other end is connected to the turntable. The mechanical transmission shaft is used to drive the turntable to rotate when the mechanical part is in operation. The turntable is further provided with a through hole corresponding to the fiber collimator, and the fiber collimator includes a transmitting optical head and a receiving optical head, which are respectively arranged on both sides of the corresponding through hole. When the mechanical part is in a stationary state, the light beam sent by the transmitting optical head is received by the receiving optical head through the corresponding through hole, and the receiving optical head sends the received light signal to the control unit. When the mechanical part is in a gear switching state, the mechanical transmission shaft drives the turntable to rotate, and the relative position of the fiber collimator 13 and the corresponding through hole changes, so that the light beam sent by the transmitting optical head is blocked by the turntable; The control unit controls whether to trigger the power electronic components of the power electronic on-load tap changer according to the state of the received optical signal.

2. The system according to claim 1, wherein: The optical fiber collimator and the through hole are each provided with a first preset number, and the control unit controls whether to trigger the power electronic component of the power electronic on-load tap changer according to the state of the received optical signal, including: The control unit controls the power electronic component of the power electronic on-load tap changer to trigger when the state of the optical signals of at least a second preset number of the optical fiber collimators changes from a light-on state to a light-off state according to the state of the received optical signals; The second preset number is smaller than the first preset number, and the first preset number is greater than or equal to two.

3. The system according to claim 2, wherein: The first preset number is four, the second preset number is two, the through holes on the turntable are arranged at 90° intervals, and the moment of triggering the power electronic component of the power electronic on-load tap changer is the moment when the second optical signal in chronological order is blocked.

4. A transmission method for a mechanical part and a power electronic component, wherein: A control unit applied to a transmission system of a mechanical part and a power electronic component according to any one of claims 1 to 3, wherein the transmission method of the mechanical part and the power electronic component comprises: Whether to trigger the power electronic components of the power electronic on-load tap changer is controlled according to the state of the optical signal sent by the optical fiber collimator.

5. The method according to claim 4, wherein The method of controlling whether to trigger the power electronic component of the power electronic on-load tap changer according to the state of the optical signal sent by the optical fiber collimator includes: According to the state of the optical signal sent by the optical fiber collimator, when the state of the optical signal of at least a second preset number of the optical fiber collimators changes from a light-on state to a light-off state, controlling the power electronic component of the power electronic on-load tap changer to trigger; Wherein, the optical fiber collimator and the through hole are both provided with a first preset number, the second preset number is smaller than the first preset number, and the first preset number is greater than or equal to two.

6. The method according to claim 5, wherein: The first preset number is four, the second preset number is two, and the moment of triggering the power electronic component of the power electronic on-load tap changer is the moment when the optical signal that is second in chronological order is blocked.

7. The method according to claim 4, wherein: Before controlling whether to trigger the power electronic components of the power electronic on-load tap changer according to the state of the optical signal sent by the optical fiber collimator, the method includes: A de-bouncing time of a first preset time length is set for the optical signal sent by each optical fiber collimator when it changes from a light state to a light-off state, and the moment when the optical signal is detected to be in a light-off state after the de-bouncing time has passed is regarded as the moment when the optical signal is blocked.

8. The method according to claim 4, wherein After controlling whether to trigger the power electronic components of the power electronic on-load tap changer according to the state of the optical signal sent by the optical fiber collimator, the method includes: After the power electronic component controlling the power electronic on-load tap changer is triggered and the switching is completed, each of the optical signals is detected within a second preset time period. If the number of the optical signals detected to be in the light-on state is less than a third preset number, a fault alarm is initiated.

9. The method according to claim 8, wherein The time obtained by adding the third preset time period to the time when the power electronic component that controls the power electronic on-load tap changer is triggered is used as the time when the switching is completed.

10. The method according to claim 9, wherein: The second preset duration is 180ms-220ms, the third preset duration is 100ms-120ms, and the third preset number is two.

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