Generator circuit breaker control system and method based on stroke curve

Abstract

The invention provides a generator circuit breaker control system and method based on a stroke curve, and the method comprises the steps: building a control system through employing an electromagnetic repulsion mechanism, a laser displacement sensor, a vacuum arc-extinguishing chamber, a drive circuit, a controller, a transfer capacitor branch, and a small-capacity circuit breaker S1, and collecting the stroke data of a main branch circuit breaker in real time; and establishing a circuit breaker travel curve model. When a short-circuit fault occurs at the outlet side of the generator, the action time of the circuit breaker is predicted according to the travel curve of the main branch circuit breaker, and the opening time is optimized through a correction algorithm, so that the quick and accurate control of the generator circuit breaker is realized. The problem that an existing control method excessively depends on a complex short-circuit current calculation expression is mainly solved, the generator circuit breaker control method which is small in interference influence and high in universality is provided, and the technical blank in the field of generator outlet side circuit break control is filled up.

Description

Technical Field

[0001] The invention belongs to the technical field of intelligent control of generator output circuit breakers, and relates to a control system and method of a generator circuit breaker based on a travel curve. Background Art

[0002] In recent years, with the rapid development of the power system, the voltage level has been continuously improved, and the single-unit capacity of the generator has also increased significantly. Although this trend has greatly improved the efficiency and scale of power production, it has also brought new challenges, especially the increasing severity of short-circuit faults on the generator outlet side. Short-circuit faults, as a common type of fault in the power system, may not only cause equipment damage, but also trigger a chain reaction, affecting the stable operation of the entire power system, and even causing large-scale power outages, causing significant impacts on the economy and society.

[0003] The short circuit fault on the generator outlet side is particularly harmful because it occurs at the key link of power conversion. The instantaneous impact of high voltage and high current may cause serious damage to the generator body, transformer, switchgear, etc., shorten the service life of the equipment and increase maintenance costs. In addition, the short circuit fault will also cause grid voltage fluctuations, affect the quality of power, and pose a threat to various electrical equipment connected to the grid.

[0004] In order to effectively meet this challenge, generator circuit breakers, as important protective equipment in power systems, play an increasingly critical role. Generator circuit breakers are not only required to have extremely high breaking capacity, and be able to quickly break short-circuit currents in a very short time (usually in milliseconds) to limit the expansion of the fault range, but also have good thermal stability and electrical life to ensure that they can still work reliably after multiple actions. Modern generator circuit breakers usually use advanced arc extinguishing technology and materials, as well as precise control systems to achieve fast and accurate fault isolation and ensure the continuous and stable operation of the power system.

[0005] In addition to the technical progress of generator circuit breakers themselves, the overall protection strategy of the power system is also being optimized. For example, by configuring reasonable relay protection devices to achieve rapid detection and location of faults; using automated control systems to improve the efficiency and accuracy of fault handling; and strengthening daily monitoring and maintenance of power systems to promptly discover and handle potential safety hazards, these are all important measures to reduce the impact of short-circuit faults and improve the stability of power systems.

[0006] At present, most of the generator output circuit breakers on the market use control methods based on short-circuit current characteristics, which rely on the calculation expression of short-circuit current. However, due to the complex calculation formula of short-circuit fault current on the generator output side, it is difficult to quickly and accurately predict the opening time in practical applications, resulting in the circuit breaker response speed being less than ideal. At the same time, traditional circuit breakers (such as SF6 circuit breakers) have slow breaking speeds and limited breaking current levels during fault handling, which cannot meet the requirements of modern power equipment for high efficiency and environmental protection. Although hybrid circuit breakers have the advantages of breaking higher current levels and fast speeds, their control methods also face higher technical challenges. Summary of the invention

[0007] In view of the problems existing in the prior art, the present invention provides a generator circuit breaker current transfer control system and method based on the main circuit breaker breaking stroke, which solves the problem of excessive reliance on short-circuit current in existing control methods, and solves the problem that the short-circuit fault current calculation formula on the generator outlet side is relatively complex, resulting in the predicted circuit breaking time not being fast and accurate enough. The method has the characteristics of strong versatility and strong anti-interference ability.

[0008] The present invention is achieved through the following technical solutions: A generator circuit breaker control system based on a travel curve, comprising: Electromagnetic repulsion mechanism, laser displacement sensor 5, vacuum interrupter 1, drive circuit, controller 6, transfer capacitor branch and small capacity circuit breaker S1; The laser displacement sensor is arranged outside the electromagnetic repulsion mechanism, and the vacuum interrupter is connected to the electromagnetic repulsion mechanism to form a main branch circuit breaker; The main branch circuit breaker comprises a moving contact and a stationary contact, and a main branch circuit breaker break is formed between the moving contact and the stationary contact; The input end of the controller is connected to the laser displacement sensor for receiving the stroke of the main branch circuit breaker; the output end of the controller is connected to the input end of the drive circuit, and the output end of the drive circuit is connected to the electromagnetic repulsion mechanism; the transfer capacitor branch is arranged below the main branch circuit breaker and connected in parallel with the main branch circuit breaker; the small-capacity circuit breaker S1 is arranged below the main branch circuit breaker, and its two ends are respectively connected to the main branch circuit breaker and the transfer branch.

[0009] Preferably, the electromagnetic repulsion mechanism includes an electromagnetic repulsion mechanism housing, a cross bracket and an excitation coil; the cross bracket and the excitation coil are both located inside the electromagnetic repulsion mechanism housing, the laser displacement sensor is arranged on the electromagnetic repulsion mechanism housing, and the output end of the drive circuit is connected to the excitation coil.

[0010] Preferably, the stroke of the main branch circuit breaker breaking port is 0-15 mm, and the displacement of the cross bracket is 0-15 mm.

[0011] Preferably, when the main branch circuit breaker is in the closed position, the main branch circuit breaker break stroke is 0 and the cross bracket displacement is 0; when the main branch circuit breaker is in the open position, the main branch circuit breaker break stroke is 15mm and the cross bracket displacement is 15mm.

[0012] Preferably, the measuring range of the laser displacement sensor is 50 mm-100 mm, and the distance between the laser displacement sensor and the cross bracket is 70 mm-85 mm.

[0013] Preferably, when the main branch circuit breaker is in the closed position, the displacement measured by the laser displacement sensor is 85 mm; when the main branch circuit breaker is in the open position, the displacement measured by the laser displacement sensor is 70 mm. A generator circuit breaker control method based on a travel curve comprises the following steps: According to the travel curve of the main branch circuit breaker and the requirements of the generator output circuit breaker, the theoretical change rate of the main branch circuit breaker's longitudinal movement distance to the breaking time is set, that is, and ; The travel curve of the main branch circuit breaker contact is collected in real time. When the main branch circuit breaker receives a breaking command, the change rate k of the actual measurement of the breaking time of the main branch circuit breaker contact moving in the longitudinal direction in the travel curve is calculated; By analyzing the changing state between the actual measured change rate k and the theoretical change rate value, the breaking time of the main branch circuit breaker is obtained. The current input of the transfer capacitor branch is controlled by the breaking time to control the breaking of the main branch circuit breaker, and the breaking of the small capacity circuit breaker S1 is controlled to control the breaking of the generator outlet circuit breaker.

[0014] Preferably, the calculation process of the actual measured change rate k is: Actual measured rate of change , In the formula, is the time difference between the sampling points of the two main branch circuit breaker contacts, that is, , is the sampling frequency of the laser displacement sensor; Indicates the distance that the contact of the Nth sampling point moves in the longitudinal direction, that is, The travel curve value of the sampling point is Indicates The stroke curve value of each sampling point. Preferably, the sampling frequency for real-time acquisition of the travel curve of the main branch circuit breaker contact is 100 kHz, that is, the time interval between each sampling point is is 10us.

[0015] Preferably, the breaking time of the main branch circuit breaker is obtained by analyzing the changing state of the actually measured change rate k and the theoretical change rate value. The specific process is: Theoretical change rate value, including theoretical change rate values ​​in two different stages and the theoretical rate of change ; The travel curve of the main branch circuit breaker contacts is collected in a discrete manner, and the main branch circuit breaker contacts begin to separate as At the moment, after the main branch circuit breaker receives the breaking command, when the actual measured change rate k changes from The value changes to When the actual measured change rate k changes, the moment is recorded as ; When the actual measured change rate k changes to 0, that is, when the main branch circuit breaker is completely disconnected, the disconnection moment is captured and recorded as ; When the main branch circuit breaker is opened for When the transfer current is input through the transfer capacitor branch, the short-circuit current on the main branch circuit breaker drops rapidly to 0, so that the main branch circuit breaker can be quickly disconnected.

[0016] When the main branch circuit breaker is opened At this time, the main branch circuit breaker has been disconnected, and the transfer capacitor branch contains a current-limiting resistor. At this time, the small-capacity circuit breaker S1 is disconnected to achieve complete disconnection of the generator outlet circuit breaker.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: Aiming at the limitation that the existing control method is too dependent on the complex short-circuit current calculation expression, the present invention proposes a generator circuit breaker control system and method based on the travel curve. The method uses an electromagnetic repulsion mechanism, a laser displacement sensor, a vacuum interrupter, a drive circuit, a controller, a transfer capacitor branch and a small-capacity circuit breaker S1 to build a control system, collect the travel data of the main branch circuit breaker in real time, and establish a circuit breaker travel curve model. When a short-circuit fault occurs on the generator outlet side, the action time of the circuit breaker is predicted according to the main branch circuit breaker travel curve, and the opening time is optimized by a correction algorithm, thereby realizing fast and accurate control of the generator circuit breaker. The present invention mainly solves the problem that the existing control method is too dependent on the complex short-circuit current calculation expression, provides a generator circuit breaker control method with little interference and strong versatility, and fills the technical gap in the field of generator outlet side circuit breaker control. Different from the traditional method, this method does not rely on the characteristic calculation of the short-circuit current, but realizes fast and accurate circuit breaker control by monitoring and analyzing the travel curve of the main branch circuit breaker. It has the advantages of strong versatility and good anti-interference ability, and effectively improves the reliability and efficiency of the generator outlet circuit breaker.

[0018] Furthermore, by collecting the travel data of the main branch circuit breaker in real time and establishing a travel curve model, the system can accurately predict the action time of the circuit breaker, improve the response speed to emergency situations such as short circuit faults, reduce the duration of faults, and thus reduce potential damage to the power grid and equipment. The application of laser displacement sensors ensures high accuracy of travel data collection and further improves the accuracy of control.

[0019] Furthermore, the invention introduces an electromagnetic repulsion mechanism to make the circuit breaker operate more quickly and reliably, reducing the risk of breaking failure caused by mechanical delay or jamming. The effective use of the vacuum interrupter significantly improves the arc extinguishing ability of the circuit breaker, ensuring that the arc can be extinguished quickly and safely during the breaking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a main branch circuit breaker according to an embodiment of the present invention; Figure 2 1 is a structural diagram of an electromagnetic repulsion mechanism according to an embodiment of the present invention; FIG. (a) is a main view, and FIG. (b) is a top view; Figure 3 A driving circuit diagram of an embodiment of the present invention; Figure 4 A comparison diagram of an actual travel curve and an ideal travel curve according to an embodiment of the present invention; Figure 5 The figure is a schematic diagram of the principle of a current transfer type generator circuit breaker according to an embodiment of the present invention.

[0021] Figure 6 A time node of a main branch circuit breaker travel curve according to an embodiment of the present invention; Figure 7 A diagram of a generator circuit breaker control system based on a travel curve according to an embodiment of the present invention; In the figure, 1 is the vacuum interrupter, 2 is the excitation coil, 3 is the housing of the electromagnetic repulsion mechanism, 4 is the cross bracket, 5 is the laser displacement sensor, 6 is the controller, 7 is the static contact, 8 is the moving contact, and 9 is the main branch circuit breaker break. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] In view of the limitation of the existing control method that is too dependent on complex short-circuit current calculation expressions, the present invention proposes a generator fast circuit breaker control method based on the main branch circuit breaker travel curve. Unlike the traditional method, this method does not rely on the characteristic calculation of the short-circuit current, but achieves fast and accurate circuit breaker control by monitoring and analyzing the travel curve of the main branch circuit breaker. It has the advantages of strong versatility and good anti-interference ability, and effectively improves the reliability and efficiency of the generator output circuit breaker.

[0025] The present invention is mainly applied to current transfer type generator circuit breakers, such as Figure 3 As shown, by controlling the on and off of the controllable power device Q, the actual travel curve is controlled by PWM. Figure 4 As shown, the actual stroke curve is constantly approaching the ideal stroke curve.

[0026] like Figure 5 As shown. When the generator is in normal operation, the current flows through the main branch circuit breaker. The main branch circuit breaker and the circuit breaker S on the transfer branch are fast circuit breakers driven by a fast repulsion mechanism, which can achieve fast opening after being triggered. Figure 6 As shown in FIG. 1 , when the main branch circuit breaker receives the breaking command, the control algorithm is started and the change rate k of the breaking time of the distance moved longitudinally by the contact in the stroke curve is calculated. Changes to When the change is captured, it is recorded as When the rate of change When the change is 0, that is, when the main branch circuit breaker is completely disconnected, this moment is captured and recorded as .exist The circuit breaker S1 is disconnected at all times, and finally the purpose of completely disconnecting the fault circuit is achieved.

[0027] Example 1 The control method applied to the generator circuit breaker of this embodiment is mainly applied after the main branch circuit breaker at the generator outlet side starts to interrupt the large current, such as Figure 7 As shown, it mainly includes: Electromagnetic repulsion mechanism, laser displacement sensor 5, vacuum interrupter 1, drive circuit, controller 6, transfer capacitor branch and small capacity circuit breaker S1; The laser displacement sensor is arranged outside the electromagnetic repulsion mechanism, and the vacuum interrupter is connected to the electromagnetic repulsion mechanism to form a main branch circuit breaker; The main branch circuit breaker comprises a moving contact and a stationary contact, and a main branch circuit breaker break is formed between the moving contact and the stationary contact; The input end of the controller is connected to the laser displacement sensor for receiving the stroke of the main branch circuit breaker; the output end of the controller is connected to the input end of the drive circuit, and the output end of the drive circuit is connected to the electromagnetic repulsion mechanism; the transfer capacitor branch is arranged below the main branch circuit breaker and connected in parallel with the main branch circuit breaker; the small-capacity circuit breaker S1 is arranged below the main branch circuit breaker, and its two ends are respectively connected to the main branch circuit breaker and the transfer branch.

[0028] Preferably, the electromagnetic repulsion mechanism includes an electromagnetic repulsion mechanism housing, a cross bracket and an excitation coil; the cross bracket and the excitation coil are both located inside the electromagnetic repulsion mechanism housing, the laser displacement sensor is arranged on the electromagnetic repulsion mechanism housing, and the output end of the drive circuit is connected to the excitation coil.

[0029] Small capacity circuit breakers S1 generally use ABB molded case circuit breakers S1 series, such as S1N125, S1N160, etc.; ② Further defined, the cross bracket is connected to the main branch circuit breaker break. When the circuit breaker is opened, the cross bracket and the main branch circuit breaker break are relatively static. The stroke of the main branch break can be obtained by measuring the displacement of the cross bracket. The stroke of the main branch break is 0-15mm, and the displacement of the cross bracket is 0-15mm. When the main branch circuit breaker is in the closed position, the main branch circuit breaker break stroke is 0, and the cross bracket displacement is 0. When the main branch circuit breaker is in the open position, the main branch break stroke is 15mm, and the cross bracket displacement is 15mm.

[0030] ④ Further limit, the range of the laser displacement sensor is 50mm-100mm, and the distance between the laser displacement sensor and the cross bracket is 70mm-85mm. When the main branch circuit breaker is in the closed position, the displacement measured by the laser displacement sensor is 85mm; when the main branch circuit breaker is in the open position, the displacement measured by the laser displacement sensor is 70mm. ⑤ In the control method applied to the generator circuit breaker, after the controller receives the stroke of the main branch breaker, it compares it with the ideal stroke curve. When the PWM method is used, the actual stroke curve is as close to the ideal stroke curve as possible. When the actual stroke is less than the ideal stroke, the controllable power device Q is controlled to be turned on to speed up the main branch circuit breaker; when the actual stroke is greater than the ideal stroke, the controllable power device Q is controlled to be turned off to slow down the main branch circuit breaker, so that the actual stroke curve continues to approach the ideal stroke curve.

[0031] ⑥ Combined with the travel curve of the main branch circuit breaker and the requirements of the generator output circuit breaker, reasonably set the theoretical change rate of the distance and time of the main branch circuit breaker moving along the longitudinal direction and The rate of change and Reasonable settings should be made based on the characteristics of the actual circuit breaker.

[0032] ⑦ Real-time acquisition of the travel curve of the main branch circuit breaker contact of the generator circuit breaker. When the main branch circuit breaker receives the breaking command, the control algorithm is started, and the change rate k of the actual measurement of the breaking time of the distance moved longitudinally by the contact in the travel curve is calculated. The actual control system acquires the travel curve of the main branch circuit breaker contact in a discrete manner. Indicates the distance that the contact of the Nth sampling point moves in the longitudinal direction, causing the main branch circuit breaker contacts to begin to separate as The moment is recorded as the 0th sampling point. Indicates The stroke curve value of the sampling point, Indicates The travel curve value of the sampling point. Change rate ,in is the time difference between the two sampling points. , is the sampling frequency of the sensor. After the main branch circuit breaker receives the breaking command, the actual measured change rate k changes from the change rate Changes to When the change is captured, it is recorded as When the rate of change When the change is 0, that is, when the main branch circuit breaker is completely disconnected, this moment is captured and recorded as . By converting the discrete time coordinates into the continuous time coordinates, we can get , ,in is the sampling interval, Generally the default is .

[0033] The arcing duration of the main branch circuit breaker can be calculated based on the opening moment of the main branch circuit breaker on the generator outlet side, which is a key parameter to test whether the main branch circuit breaker is opened.

[0034] ⑧ When the main branch circuit breaker is disconnected When the transfer current is input through the transfer branch, the short-circuit current on the main branch is rapidly reduced to 0, so that the main branch is quickly disconnected.

[0035] ⑨When the main branch circuit breaker is disconnected At this time, the main branch circuit breaker has been disconnected, and the transfer branch still has a current limiting resistor in the circuit. At this time, the small-capacity circuit breaker S1 is disconnected to achieve complete disconnection of the generator outlet circuit breaker.

[0036] In one implementation case, the main branch circuit breaker structure is as follows: Figure 1 As shown, the cross bracket is connected to the main circuit breaker break in the vacuum interrupter through the components inside the electromagnetic repulsion mechanism. The laser displacement sensor is located outside the electromagnetic repulsion mechanism, and the stroke of the main circuit breaker is obtained by measuring the displacement of the cross bracket.

[0037] Figure 2 It is a structural diagram of the electromagnetic repulsion mechanism of the present invention, in which the laser displacement sensor is fixed on the shell of the electromagnetic repulsion mechanism, and the displacement of the cross bracket is measured through the hole on the shell of the electromagnetic repulsion mechanism.

[0038] Figure 3 This is the circuit diagram of the driving circuit of the present invention. Rear power supply Through the resistor Capacitor After charging is completed, S1 is disconnected. In the process of driving the electromagnetic repulsion mechanism to move, the controller controls the on and off of Q. When Q is turned on, the capacitor Discharge to the excitation coil, the circuit breaker action speed increases. When closed, the excitation coil and the freewheeling diode D form a loop, the current in the excitation coil decreases, and the circuit breaker operation speed slows down.

[0039] The driving circuit includes a DC power supply V, an energy storage capacitor C, a freewheeling thyristor D, and a power device Q; the positive electrode of the DC power supply V is connected to the small-capacity circuit breaker S2, the resistor R1, the power device Q, and the cathode of the freewheeling thyristor D in sequence, and the anode of the freewheeling thyristor D is connected to the negative electrode of the DC power supply V. One end of the energy storage capacitor C is connected to the node between the resistor R1 and the power device Q, and one end of the energy storage capacitor C is connected to the negative electrode of the DC power supply V; Figure 4 It is a comparison diagram of the actual travel curve and the ideal travel curve of an embodiment of the present invention. Under the control of the controller, the actual travel curve of the main branch circuit breaker breaks fluctuates around the ideal travel curve and keeps approaching the ideal travel curve.

[0040] Figure 5 It is a schematic diagram of the principle of an injection current generator circuit breaker of an embodiment of the present invention. In the figure, when the arrow is the direction of current flow, under normal circumstances, the current passes through the main branch circuit breaker. After a fault short circuit occurs, the transfer thyristor will be turned on according to the direction of the fault current, so that the transfer branch generates a transfer current in the opposite direction of the fault current, forcing the main branch circuit breaker current to appear zero point, and realize the interruption of the fault current. The transfer branch and the current limiting branch are directly connected in parallel with the main branch circuit breaker. When a short circuit fault occurs, the current on the main branch will increase rapidly. At the right time, the transfer branch current in the opposite direction of the main branch current can quickly reduce the current on the main branch to zero, which is conducive to the disconnection of the main branch contacts. After the main branch is disconnected, the remaining current flows through the damping module and is subject to the current limiting effect, and finally the purpose of completely disconnecting the circuit is achieved through the circuit breaker S1.

[0041] It is particularly noted that the generator circuit breaker control method based on short-circuit current symmetry of the present invention is only applicable to Figure 5 The method of the present invention is not applicable to generator circuit breakers of the current injection type and generator circuit breakers of other principles.

[0042] Figure 6 is a main branch circuit breaker travel curve diagram of this embodiment, in which the vertical axis is the distance that the main branch circuit breaker contact moves in the longitudinal direction, and Figure 6 The important time nodes captured in the control method are marked in. The moment is when the main branch circuit breaker contacts begin to separate, the control device receives the signal and starts the subsequent control method. As the distance of the contact moving in the longitudinal direction increases, the control device successively captures the moment of input transfer current. And the time of putting small capacity circuit breaker S1 into operation , and finally complete the complete disconnection of the fault circuit Figure 7It is the overall structural block diagram of this embodiment. The upper left part is the main break component and electromagnetic repulsion mechanism component in the breaking topology, and the lower part is the remaining control parts, such as transfer branch thyristor, main break mechanism thyristor, S1 switch thyristor, etc. The right side is the main control part, including laser displacement sensor, main controller and host computer part.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A generator circuit breaker control system based on a travel curve, characterized in that: include: Electromagnetic repulsion mechanism, laser displacement sensor 5, vacuum interrupter 1, drive circuit, controller 6, transfer capacitor branch and small capacity circuit breaker S1; The laser displacement sensor is arranged outside the electromagnetic repulsion mechanism, and the vacuum interrupter is connected to the electromagnetic repulsion mechanism to form a main branch circuit breaker; The main branch circuit breaker comprises a moving contact and a stationary contact, and a main branch circuit breaker break is formed between the moving contact and the stationary contact; The input end of the controller is connected to the laser displacement sensor for receiving the stroke of the main branch circuit breaker; the output end of the controller is connected to the input end of the drive circuit, and the output end of the drive circuit is connected to the electromagnetic repulsion mechanism; the transfer capacitor branch is arranged below the main branch circuit breaker and connected in parallel with the main branch circuit breaker; the small-capacity circuit breaker S1 is arranged below the main branch circuit breaker, and its two ends are respectively connected to the main branch circuit breaker and the transfer branch.

2. A generator circuit breaker control system based on a travel curve according to claim 1, characterized in that: The electromagnetic repulsion mechanism comprises an electromagnetic repulsion mechanism housing, a cross bracket and an excitation coil; the cross bracket and the excitation coil are both located inside the electromagnetic repulsion mechanism housing, the laser displacement sensor is arranged on the electromagnetic repulsion mechanism housing, and the output end of the drive circuit is connected to the excitation coil.

3. A generator circuit breaker control system based on a travel curve according to claim 1, characterized in that: The stroke of the main branch circuit breaker break is 0-15mm, and the displacement of the cross bracket is 0-15mm.

4. A generator circuit breaker control system based on a travel curve according to claim 3, characterized in that: When the main branch circuit breaker is in the closed position, the main branch circuit breaker break stroke is 0 and the cross bracket displacement is 0; when the main branch circuit breaker is in the open position, the main branch circuit breaker break stroke is 15mm and the cross bracket displacement is 15mm.

5. The generator circuit breaker control system based on travel curve according to claim 1, characterized in that: The measuring range of the laser displacement sensor is 50mm-100mm, and the distance between the laser displacement sensor and the cross bracket is 70mm-85mm.

6. The generator circuit breaker control system based on travel curve according to claim 1, characterized in that: When the main branch circuit breaker is in the closed position, the displacement measured by the laser displacement sensor is 85mm; when the main branch circuit breaker is in the open position, the displacement measured by the laser displacement sensor is 70mm.

7. A generator circuit breaker control method based on travel curve according to claim 1, characterized in that: The following steps are involved: According to the stroke curve of the main branch circuit breaker and the requirements of the generator output circuit breaker, the theoretical change rate value of the main branch circuit breaker's longitudinal moving distance to the breaking time is set; The travel curve of the main branch circuit breaker contact is collected in real time. When the main branch circuit breaker receives a breaking command, the change rate k of the actual measurement of the breaking time of the main branch circuit breaker contact moving in the longitudinal direction in the travel curve is calculated; By analyzing the changing state between the actual measured change rate k and the theoretical change rate value, the breaking time of the main branch circuit breaker is obtained. The current input of the transfer capacitor branch is controlled by the breaking time to control the breaking of the main branch circuit breaker, and the breaking of the small capacity circuit breaker S1 is controlled to control the breaking of the generator outlet circuit breaker.

8. A method for controlling current transfer of a generator circuit breaker based on the main circuit breaker breaking stroke according to claim 7, characterized in that: The calculation process of the actual measured change rate k is: Actual measured rate of change , In the formula, is the time difference between the sampling points of the two main branch circuit breaker contacts, that is, , is the sampling frequency of the laser displacement sensor; Indicates the distance that the contact of the Nth sampling point moves in the longitudinal direction, that is, The travel curve value of the sampling point is Indicates The stroke curve value of each sampling point.

9. A method for controlling current transfer of a generator circuit breaker based on the main circuit breaker breaking stroke according to claim 8, characterized in that: The sampling frequency of real-time acquisition of the travel curve of the main branch circuit breaker contact is 100kHz, that is, the time interval of each sampling point is 10us.

10. A method for controlling current transfer of a generator circuit breaker based on the main circuit breaker breaking stroke according to claim 7, characterized in that: By analyzing the changing state of the actual measured change rate k and the theoretical change rate value, the breaking time of the main branch circuit breaker is obtained. The specific process is as follows: Theoretical change rate value, including theoretical change rate values ​​in two different stages and the theoretical rate of change ; The travel curve of the main branch circuit breaker contacts is collected in a discrete manner, and the main branch circuit breaker contacts begin to separate as At the moment, after the main branch circuit breaker receives the breaking command, when the actual measured change rate k changes from The value changes to When the actual measured change rate k changes, the moment is recorded as ; When the actual measured change rate k changes to 0, that is, when the main branch circuit breaker is completely disconnected, the disconnection moment is captured and recorded as ; When the main branch circuit breaker is opened for When the transfer current is input through the transfer capacitor branch, the short-circuit current on the main branch circuit breaker drops rapidly to 0, so that the main branch circuit breaker can be quickly disconnected; When the main branch circuit breaker is opened At this time, the main branch circuit breaker has been disconnected, and the transfer capacitor branch contains a current-limiting resistor. At this time, the small-capacity circuit breaker S1 is disconnected to achieve complete disconnection of the generator outlet circuit breaker.

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