A generator circuit breaker control system and method based on a travel curve

Abstract

The application provides a generator circuit breaker control system and method based on a stroke curve, which is built by using 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, stroke data of a main branch circuit breaker is collected in real time, and a circuit breaker stroke curve model is established. When a short-circuit fault occurs at a generator outlet side, the action time of the circuit breaker is predicted according to the stroke curve of the main branch circuit breaker, and the opening time is optimized through a correction algorithm, so that the fast and accurate control of the generator circuit breaker is realized. The application mainly solves the problem that the existing control method is too dependent on a complex short-circuit current calculation expression, provides a generator circuit breaker control method with small interference and strong universality, and fills the technical blank in the field of generator outlet side circuit control.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of intelligent control of generator outlet circuit breaker, and relates to a generator circuit breaker control system and method based on a stroke curve. BACKGROUND

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

[0003] The short-circuit fault at the generator outlet side is particularly harmful because it occurs at a critical link of power conversion. The instantaneous impact of high voltage and large current can cause serious damage to the generator body, transformer, switchgear, and other equipment, shorten the service life of the equipment, and increase maintenance costs. In addition, short-circuit faults can also cause voltage fluctuations in the power grid, affecting power quality and threatening various electrical equipment connected to the grid.

[0004] In order to effectively respond to this challenge, the generator circuit breaker, as an important protective device in the power system, plays an increasingly critical role. The generator circuit breaker not only requires high breaking capacity, which can quickly break the short-circuit current in a very short time (usually measured in milliseconds) to limit the expansion of the fault, but also has good thermal stability and electrical life to ensure reliable operation 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 technological progress of the generator circuit breaker itself, the overall protection strategy of the power system is also being optimized. For example, by configuring reasonable relay protection devices, fast detection and positioning of faults can be achieved; by using automated control systems, the efficiency and accuracy of fault handling can be improved; and by strengthening the daily monitoring and maintenance of the power system, potential safety hazards can be discovered and handled in a timely manner, which are important measures to reduce the impact of short-circuit faults and improve the stability of the power system.

[0006] Most of the generator outlet circuit breakers on the market currently use control methods based on the characteristics of short-circuit current, which rely on the calculation expression of short-circuit current. However, due to the complexity of the short-circuit fault current calculation formula at the generator outlet side, it is difficult to quickly and accurately predict the breaking time in practical applications, resulting in an unsatisfactory response speed of the circuit breaker. At the same time, traditional circuit breakers (such as SF6 circuit breakers) have slow breaking speed and limited breaking current level when handling faults, 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 faster speed, their control methods also face higher technical challenges. SUMMARY

[0007] In view of the problems in the prior art, the present application provides a generator circuit breaker current transfer control system and method based on the breaking stroke of the main circuit breaker, which solves the problem of excessive dependence of existing control methods on short-circuit current, and the problem of the complexity of the short-circuit fault current calculation formula at the generator outlet side, which leads to an insufficiently fast and accurate prediction of the breaking time. The method has the characteristics of strong universality and strong anti-interference capability.

[0008] The present application is realized by the following technical solutions:

[0009] A generator circuit breaker control system based on stroke curve, comprising:

[0010] An electromagnetic repulsion mechanism, a laser displacement sensor 5, a vacuum arc chamber 1, a drive circuit, a controller 6, and a transfer capacitor branch and a small-capacity circuit breaker S1;

[0011] The laser displacement sensor is arranged outside the electromagnetic repulsion mechanism, and the vacuum arc chamber is connected with the electromagnetic repulsion mechanism to form a main branch circuit breaker;

[0012] The main branch circuit breaker comprises a moving contact and a stationary contact, and a main branch circuit breaker breaking point is formed between the moving contact and the stationary contact;

[0013] The input end of the controller is connected with the laser displacement sensor for receiving the stroke of the main branch circuit breaker breaking point; the output end of the controller is connected with the input end of the drive circuit, the output end of the drive circuit is connected with the electromagnetic repulsion mechanism; the transfer capacitor branch is arranged below the main branch circuit breaker and is connected in parallel with the main branch circuit breaker; and the small-capacity circuit breaker S1 is arranged below the main branch circuit breaker and is connected at both ends with the main branch circuit breaker and the transfer branch, respectively.

[0014] Preferably, the electromagnetic repulsion mechanism comprises an electromagnetic repulsion mechanism shell, a cross slide and an excitation coil; the cross slide and the excitation coil are located inside the electromagnetic repulsion mechanism shell, the laser displacement sensor is arranged on the electromagnetic repulsion mechanism shell, and an output end of the drive circuit is connected with the excitation coil.

[0015] Preferably, the stroke of the main branch circuit breaker contact is 0-15 mm, and the displacement of the cross slide is 0-15 mm.

[0016] Preferably, when the main branch circuit breaker is in the closed position, the stroke of the main branch circuit breaker contact is 0, and the displacement of the cross slide is 0; when the main branch circuit breaker is in the open position, the stroke of the main branch circuit breaker contact is 15 mm, and the displacement of the cross slide is 15 mm.

[0017] Preferably, the range of the laser displacement sensor is 50 mm-100 mm, and the distance between the laser displacement sensor and the cross slide is 70 mm-85 mm.

[0018] 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.

[0019] A generator circuit breaker control method based on a stroke curve, comprising the following steps:

[0020] According to the stroke curve of the main branch circuit breaker contact and the requirements of the generator outlet circuit breaker, the theoretical change rate value of the distance of the longitudinal movement of the main branch circuit breaker to the breaking time is set, that is, and ;

[0021] The stroke curve of the main branch circuit breaker contact is collected in real time, and when the main branch circuit breaker receives a breaking command, the actual measured change rate k of the distance of the longitudinal movement of the main branch circuit breaker contact to the breaking time in the stroke curve is calculated.

[0022] By analyzing the change 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 capacitance 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.

[0023] Preferably, the calculation process of the actual measured change rate k is as follows:

[0024] The actual measured change rate ,

[0025] In the formula, wherein is the time difference between the sampling points of the two main branch circuit breaker contacts, namely , is the sampling frequency of the laser displacement sensor; is the distance of the contact along the longitudinal direction at the Nth sampling point, namely the stroke curve value of the Nth sampling point, then is the stroke curve value of the Nth sampling point. is the stroke curve value of the Nth sampling point.

[0026] Preferably, the sampling frequency of the stroke curve of the main branch circuit breaker contact collected in real time is 100 kHz, namely the time interval of each sampling point is 10 us.

[0027] Preferably, the breaking time of the main branch circuit breaker is obtained by analyzing the change state of the actual measured change rate k and the theoretical change rate value, and the specific process is as follows:

[0028] The theoretical change rate value includes two different stage theoretical change rate values and .

[0029] The stroke curve of the main branch circuit breaker contact is collected in a discrete manner, and the time when the main branch circuit breaker contact starts to separate is taken as When the actual measured change rate k changes from to after the main branch circuit breaker receives the breaking command, the time when the actual measured change rate k changes is captured and recorded as When the actual measured change rate k changes to 0, namely the time when the main branch circuit breaker completes breaking, the breaking time is captured and recorded as .

[0030] When the breaking time of the main branch circuit breaker is , the transfer capacitance branch is put into the transfer current, so that the short-circuit current on the main branch circuit breaker rapidly decreases to 0, and the main branch circuit breaker realizes fast breaking.

[0031] When the breaking time of the main branch circuit breaker is , the main branch circuit breaker has completed breaking at this time, the transfer capacitance branch contains a limited current resistance, and the small-capacity circuit breaker S1 is broken at this time, realizing complete breaking of the generator outlet circuit breaker.

[0032] Compared with the prior art, the present application has the following beneficial technical effects:

[0033] ​​In view of the limitation that the existing control method relies too much on complex short-circuit current calculation expression, the application provides a generator circuit breaker control system and method based on stroke curve, which uses an electromagnetic repulsion mechanism, a laser displacement sensor, a vacuum arc chamber, a drive circuit, a controller, a transfer capacitor branch and a small-capacity circuit breaker S1 to build a control system, collects stroke data of the main branch circuit breaker in real time, and establishes a circuit breaker stroke 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 stroke curve of the main branch circuit breaker, and the opening time is optimized through a correction algorithm, so that fast and accurate control of the generator circuit breaker is realized. The application mainly solves the problem that the existing control method relies too much on complex short-circuit current calculation expression, provides a generator circuit breaker control method with small interference and strong universality, fills the technical gap in the field of generator outlet circuit control, and has the advantages of strong universality and good anti-interference ability, effectively improving the reliability and efficiency of the generator outlet circuit breaker.

[0034] Further, the application collects stroke data of the main branch circuit breaker in real time, and establishes a stroke curve model, so that 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 fault duration, and thus reduce the potential damage to the power grid and equipment. The application of the laser displacement sensor ensures the high precision of stroke data collection, further improving the accuracy of control.

[0035] Further, the application introduces the electromagnetic repulsion mechanism to make the action of the circuit breaker more rapid and reliable, reduces the risk of opening failure caused by mechanical delay or jamming, effectively utilizes the vacuum arc chamber to significantly improve the arc extinguishing capacity of the circuit breaker, and ensures that the arc in the opening process can be quickly and safely extinguished. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The structure diagram of the main branch circuit breaker of an embodiment of the application;

[0037] Figure 2 The structure diagram of the electromagnetic repulsion mechanism of an embodiment of the application; Fig. (a) is a front view, and Fig. (b) is a top view;

[0038] Figure 3 The circuit diagram of the drive circuit of an embodiment of the application;

[0039] Figure 4 The comparison diagram of the actual stroke curve and the ideal stroke curve of an embodiment of the application;

[0040] Figure 5 This is a schematic diagram of the principle of a current-transfer generator circuit breaker according to an embodiment of the present invention.

[0041] Figure 6 This refers to the time node of the main branch circuit breaker travel curve in one embodiment of the present invention.

[0042] Figure 7 This is a diagram of a generator circuit breaker control system based on a stroke curve, according to an embodiment of the present invention.

[0043] In the diagram, 1 is the vacuum interrupter, 2 is the excitation coil, 3 is the outer shell of the electromagnetic repulsion mechanism, 4 is the cross bracket, 5 is the laser displacement sensor, 6 is the controller, 7 is the stationary contact, 8 is the moving contact, and 9 is the break point of the main branch circuit breaker. Detailed Implementation

[0044] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0045] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0046] To address the limitations of existing control methods that rely too heavily on complex short-circuit current calculation expressions, this invention proposes a generator fast circuit breaker control method based on the travel curve of the main branch circuit breaker. Unlike traditional methods, this method does not rely on the characteristic calculation of short-circuit current, but instead achieves fast and accurate circuit breaking control by monitoring and analyzing the travel curve of the main branch circuit breaker. It possesses advantages such as strong versatility and good anti-interference capability, effectively improving the reliability and efficiency of the generator outlet circuit breaker.

[0047] This invention is mainly applied to flow-transfer type generator circuit breakers, such as... Figure 3 As shown, the actual stroke curve is controlled by PWM through the switching on and off of the controllable power device Q. Figure 4 As shown, this makes the actual travel curve continuously approach the ideal travel curve.

[0048] like Figure 5 As shown. When the generator is in normal operation, current flows through the main branch circuit breaker. Both the main branch circuit breaker and the circuit breaker S on the transfer branch are fast-acting circuit breakers driven by a fast repulsion mechanism, enabling rapid tripping after triggering. For example... Figure 6As shown, when the main branch circuit breaker receives the breaking command, the control algorithm is started, and the rate of change of breaking time k with respect to the distance of the contact along the longitudinal direction in the stroke curve is calculated. After the main branch circuit breaker receives the breaking command, the rate of change k changes to , and the time when the change occurs is recorded as . When the rate of change k changes to 0, i.e., at the moment when the main branch circuit breaker completes breaking, the time is captured and recorded as . At the moment when the rate of change k changes to 0, i.e., at the moment when the main branch circuit breaker completes breaking, the time is captured and recorded as . At the moment when the rate of change k changes to 0, i.e., at the moment when the main branch circuit breaker completes breaking, the time is captured and recorded as . At the moment when the rate of change k changes to 0, i.e., at the moment when the main branch circuit breaker completes breaking, the time is captured and recorded as , the circuit breaker S1 is opened, and the purpose of completely breaking the fault circuit is finally achieved.

[0049] Embodiment 1

[0050] The control method for the generator circuit breaker in this embodiment is mainly applied after the main branch circuit breaker at the outlet side of the generator starts breaking a large current, as shown in Figure 7 , which mainly includes:

[0051] an electromagnetic repulsion mechanism, a laser displacement sensor 5, a vacuum arc chamber 1, a drive circuit, a controller 6, and a transfer capacitance branch and a small-capacity circuit breaker S1;

[0052] The laser displacement sensor is arranged outside the electromagnetic repulsion mechanism, and the vacuum arc chamber is connected with the electromagnetic repulsion mechanism to form the main branch circuit breaker.

[0053] The main branch circuit breaker includes a moving contact and a stationary contact, and a main branch circuit breaker breaking gap is formed between the moving contact and the stationary contact.

[0054] The input end of the controller is connected with the laser displacement sensor, for receiving the stroke of the main branch circuit breaker breaking gap; the output end of the controller is connected with the input end of the drive circuit, the output end of the drive circuit is connected with the electromagnetic repulsion mechanism; the transfer capacitance branch is arranged below the main branch circuit breaker and is connected in parallel with the main branch circuit breaker; and the small-capacity circuit breaker S1 is arranged below the main branch circuit breaker and is connected at both ends with the main branch circuit breaker and the transfer branch, respectively.

[0055] Preferably, the electromagnetic repulsion mechanism includes an electromagnetic repulsion mechanism shell, a cross bracket, and an excitation coil; the cross bracket and the excitation coil are both located inside the electromagnetic repulsion mechanism shell, the laser displacement sensor is arranged on the electromagnetic repulsion mechanism shell, and the output end of the drive circuit is connected with the excitation coil.

[0056] The small-capacity circuit breaker S1 generally adopts the ABB molded case circuit breaker S1 series, such as S1N125, S1N160, etc.

[0057] ② Further defining the connection, the cross bracket is connected to the break point of the main branch circuit breaker. When the circuit breaker is open, the cross bracket and the break point of the main branch circuit breaker are relatively stationary. The stroke of the main branch break point can be obtained by measuring the displacement of the cross bracket. The stroke of the main branch break point 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 stroke of the main branch circuit breaker break point is 0, and the displacement of the cross bracket is 0. When the main branch circuit breaker is in the open position, the stroke of the main branch break point is 15mm, and the displacement of the cross bracket is 15mm.

[0058] ④ Further specified, 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.

[0059] ⑤ In the control method applied to the generator circuit breaker, after the controller receives the stroke of the main branch circuit breaker, it compares it with the ideal stroke curve. When using PWM, the actual stroke curve is as close as possible to the ideal stroke curve. When the actual stroke is less than the ideal stroke, the controllable power device Q is turned on, increasing the speed of the main branch circuit breaker; when the actual stroke is greater than the ideal stroke, the controllable power device Q is turned off, decreasing the speed of the main branch circuit breaker, so that the actual stroke curve continuously approaches the ideal stroke curve.

[0060] ⑥ Based on the stroke curve of the main branch circuit breaker and the requirements of the generator outlet circuit breaker, reasonably set the theoretical rate of change of the longitudinal movement distance and time of the main branch circuit breaker. and Where the rate of change and The settings should be made reasonably based on the actual characteristics of the circuit breaker.

[0061] ⑦ The travel curve of the main branch circuit breaker contacts of the generator circuit breaker is acquired in real time. When the main branch circuit breaker receives an opening command, the control algorithm is activated, and the rate of change k of the longitudinal movement distance of the contacts in the travel curve relative to the actual measured opening time is calculated. The actual control system acquires the travel curve of the main branch circuit breaker contacts in a discrete manner. This represents the distance the contact at the Nth sampling point moves longitudinally, causing the main branch circuit breaker contacts to begin separating. The time is recorded as the 0th sampling point. Indicates the first The travel curve values ​​at each sampling point Indicates the first The travel curve values ​​at each sampling point. Rate of change. Wherein is the time difference between two sampling points, i.e. , is the sensor sampling frequency, after the main branch circuit breaker receives the breaking command, the actual measured rate of change k changes from the rate of change to , the time when the change occurs is recorded as . When the rate of change changes to 0, i.e. at this moment the main branch circuit breaker completes the breaking, the time is captured and recorded as . By converting the discrete time coordinate to the continuous time coordinate, we can get , , wherein is the sampling interval, , generally defaults to .

[0062] The generator outlet side main branch circuit breaker breaking time can be calculated to calculate the arc length of the main branch circuit breaker, which is the key parameter to test whether the main branch circuit breaker is broken.

[0063] When the main branch circuit breaker breaking time , the transfer branch is put into the transfer current, so that the short-circuit current on the main branch is rapidly reduced to 0, so that the main branch realizes fast breaking.

[0064] When the main branch circuit breaker breaking time , at this moment the main branch circuit breaker has completed the breaking, and the transfer branch still has a current limiting resistor in the circuit, at this moment the small capacity circuit breaker S1 is broken, and the generator outlet circuit breaker is completely broken.

[0065] In an embodiment, the main branch circuit breaker structure is as shown in Figure 1 , the cross bracket is connected with the main branch circuit breaker fracture in the vacuum arc chamber through the elements inside the electromagnetic repulsion mechanism. The laser displacement sensor is located outside the electromagnetic repulsion mechanism, and the displacement of the cross bracket is measured to obtain the stroke of the main branch circuit breaker.

[0066] Figure 2 is the structure diagram of the electromagnetic repulsion mechanism of the application, in which the laser displacement sensor is fixed on the electromagnetic repulsion mechanism shell, and the displacement of the cross bracket is measured through the hole on the electromagnetic repulsion mechanism shell.

[0067] Figure 3 is the driving circuit circuit diagram of the application. After the power is turned off, the power supply charges the capacitor through the resistor Charging. After the charging is completed, S1 is disconnected. During the driving of the electromagnetic repulsion mechanism, the conduction and non-conduction of Q are controlled by the controller. When Q is conducted, the capacitor The discharge of the excitation coil accelerates the action speed of the circuit breaker. When When the excitation coil and the freewheeling diode D form a loop, the current in the excitation coil decreases, and the action speed of the circuit breaker slows down.

[0068] The driving circuit comprises a direct current power supply V, an energy storage capacitor C, a freewheeling thyristor D, and a power device Q. The positive pole of the direct current power supply V is connected with a small-capacity circuit breaker S2, a 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 with the negative pole of the direct current power supply V. One end of the energy storage capacitor C is connected with the node between the resistor R1 and the power device Q, and the other end of the energy storage capacitor C is connected with the negative pole of the direct current power supply V.

[0069] Figure 4 is a comparison diagram of the actual travel curve and the ideal travel curve of an embodiment of the present application. Under the control of the controller, the actual travel curve of the breaking point of the main branch circuit breaker fluctuates near the ideal travel curve and constantly approaches the ideal travel curve.

[0070] Figure 5 is a schematic diagram of the injection current generator circuit breaker of an embodiment of the present application. In the diagram, the arrow is the current flow direction. Under normal circumstances, the current passes through the main branch circuit breaker. After a short-circuit fault occurs, the transfer thyristor is turned on according to the fault current direction, so that a transfer current opposite to the fault current direction is generated in the transfer branch, the current in the main branch circuit breaker is forced to zero, and the breaking of the fault current is realized. 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 in the main branch circuit rapidly increases. At the right time, the transfer branch current opposite to the main branch circuit current direction is applied, so that the current in the main branch circuit is rapidly reduced to zero, which is beneficial to the breaking of the main branch circuit breaker. After the main branch circuit is disconnected, the residual current flows through the damping module and is subjected to the current limiting effect, and finally the circuit is completely broken through the circuit breaker S1.

[0071] It should be particularly noted that the generator circuit breaker control method based on the symmetry of the short-circuit current of the present application is only applied to Figure 5 the injection current generator circuit breaker, and the method of the present application is not applicable to other types of generator circuit breakers.

[0072] Figure 6 is the travel curve diagram of the main branch circuit breaker of the present embodiment. In the diagram, the vertical axis is the distance of the main branch circuit breaker contact along the vertical direction, and Figure 6 the important time nodes captured in the control method are indicated in the diagram. The control device receives the signal at the moment when the main branch circuit breaker contact starts to separate, and starts the subsequent control method. As the distance of the contact moving along the longitudinal direction increases, the control device successively captures the time of putting in the transfer current and the time of putting in the small-capacity circuit breaker S1 , and finally completes the complete breaking of the fault circuit

[0073] Figure 7 It is the overall structure diagram of the embodiment, the left upper half is the main breaking part and the electromagnetic repulsion mechanism part in the breaking topology, the lower half is the remaining control part, such as the transfer branch thyristor, the main breaking mechanism thyristor, the S1 switch thyristor and the like, and the right side is the main control part, including the laser displacement sensor, the main controller and the upper computer part.

[0074] The above is only the preferred embodiment of the present application, and does not limit the present application in any form; any ordinary technical personnel in the industry can smoothly implement the present application according to the drawings and the above description; however, any slight change, modification and evolution of the equivalent changes of the above-mentioned technical content within the scope of the technical scheme of the present application are equivalent embodiments of the present application; at the same time, any equivalent change, modification and evolution of the above-mentioned embodiments according to the essential technology of the present application are still within the protection scope of the technical scheme of the present application.

Claims

1. A travel curve based generator circuit breaker control system, characterized by, It comprises an electromagnetic repulsion mechanism, a laser displacement sensor 5, a vacuum arc-extinguishing chamber 1, a drive circuit, a controller 6, a transfer capacitance branch and a small-capacity circuit breaker S1. The laser displacement sensor is arranged outside the electromagnetic repulsion mechanism, and the vacuum arc-extinguishing chamber is connected with 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 gap is formed between the moving contact and the stationary contact. An input end of the controller is connected with the laser displacement sensor to receive the stroke of the main branch circuit breaker gap, an output end of the controller is connected with an input end of the drive circuit, an output end of the drive circuit is connected with the electromagnetic repulsion mechanism, the transfer capacitance branch is arranged below the main branch circuit breaker and is connected in parallel with the main branch circuit breaker, and the small-capacity circuit breaker S1 is arranged below the main branch circuit breaker and is connected with the main branch circuit breaker and the transfer branch at two ends. The control method of the generator circuit breaker control system based on the stroke curve comprises the following steps: According to the stroke curve of the main branch circuit breaker gap and the requirements of the generator outlet circuit breaker, a theoretical variation rate value of the distance of the longitudinal movement of the main branch circuit breaker to the breaking time is set; When the main branch circuit breaker receives a breaking command, the actual measured variation rate k of the distance of the longitudinal movement of the main branch circuit breaker to the breaking time in the stroke curve is calculated; By analyzing the variation state between the actual measured variation rate k and the theoretical variation rate value, the breaking time of the main branch circuit breaker is obtained, the current input of the transfer capacitance 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. The electromagnetic repulsion mechanism comprises an electromagnetic repulsion mechanism shell, a cross bracket and an excitation coil, the cross bracket and the excitation coil are located inside the electromagnetic repulsion mechanism shell, the laser displacement sensor is arranged on the electromagnetic repulsion mechanism shell, and an output end of the drive circuit is connected with the excitation coil.

2. A travel curve based generator circuit breaker control system as claimed in claim 1, wherein, The stroke of the main branch circuit breaker gap is 0-15 mm, and the displacement of the cross bracket is 0-15 mm.

3. A travel curve based generator circuit breaker control system as claimed in claim 1, wherein, When the main branch circuit breaker is in a closing position, the stroke of the main branch circuit breaker gap is 0, and the displacement of the cross bracket is 0; when the main branch circuit breaker is in an opening position, the stroke of the main branch circuit breaker gap is 15 mm, and the displacement of the cross bracket is 15 mm.

4. A travel curve based generator circuit breaker control system as claimed in claim 3, wherein, The 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.

5. A travel curve based generator circuit breaker control system as claimed in claim 1, wherein, When the main branch circuit breaker is in the closing position, the displacement measured by the laser displacement sensor is 85 mm; when the main branch circuit breaker is in the opening position, the displacement measured by the laser displacement sensor is 70 mm.

6. A travel curve based generator circuit breaker control system as claimed in claim 1, wherein, The control method comprises the following steps:

7. A control method applied to the travel curve-based generator circuit breaker control system according to claim 1, characterized by, According to the stroke curve of the main branch circuit breaker gap and the requirements of the generator outlet circuit breaker, a theoretical variation rate value of the distance of the longitudinal movement of the main branch circuit breaker to the breaking time is set; When the main branch circuit breaker receives a breaking command, the actual measured variation rate k of the distance of the longitudinal movement of the main branch circuit breaker to the breaking time in the stroke curve is calculated; By analyzing the variation state between the actual measured variation rate k and the theoretical variation rate value, the breaking time of the main branch circuit breaker is obtained, the current input of the transfer capacitance 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. The electromagnetic repulsion mechanism comprises an electromagnetic repulsion mechanism shell, a cross bracket and an excitation coil, the cross bracket and the excitation coil are located inside the electromagnetic repulsion mechanism shell, the laser displacement sensor is arranged on the electromagnetic repulsion mechanism shell, and an output end of the drive circuit is connected with the excitation coil. The stroke of the main branch circuit breaker gap is 0-15 mm, and the displacement of the cross bracket is 0-15 mm. When the main branch circuit breaker is in a closing position, the stroke of the main branch circuit breaker gap is 0, and the displacement of the cross bracket is 0; when the main branch circuit breaker is in an opening position, the stroke of the main branch circuit breaker gap is 15 mm, and the displacement of the cross bracket is 15 mm. The 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. When the main branch circuit breaker is in the closing position, the displacement measured by the laser displacement sensor is 85 mm; when the main branch circuit breaker is in the opening position, the displacement measured by the laser displacement sensor is 70 mm. The control method comprises the following steps: According to the stroke curve of the main branch circuit breaker gap and the requirements of the generator outlet circuit breaker, a theoretical variation rate value of the distance of the longitudinal movement of the main branch circuit breaker to the breaking time is set; When the main branch circuit breaker receives a breaking command, the actual measured variation rate k of the distance of the longitudinal movement of the main branch circuit breaker to the breaking time in the stroke curve is calculated; By analyzing the variation state between the actual measured variation rate k and the theoretical variation rate value, the breaking time of the main branch circuit breaker is obtained, the current input of the transfer capacitance 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. The stroke curve of the main branch circuit breaker contact is collected in real time, and when the main branch circuit breaker receives an opening command, the actual measured change rate k of the distance of the main branch circuit breaker contact moving along the longitudinal direction in the stroke curve to the actual measured opening time is calculated; The opening time of the main branch circuit breaker is obtained by analyzing the change state between the actual measured change rate k and the theoretical change rate value, the current input of the transfer capacitance branch is controlled by the opening time to control the breaking of the main branch circuit breaker, and the opening of the small-capacity circuit breaker S1 is controlled to control the breaking of the generator outlet circuit breaker.

8. The control method of the travel curve-based generator circuit breaker control system according to claim 7, characterized by, The calculation process of the actual measured change rate k is as follows: Actual measured rate of change , wherein is the time difference between the sampling points of the two main branch circuit breaker contacts, i.e. , is the sampling frequency of the laser displacement sensor; denotes the distance of the contact at the Nth sampling point in the longitudinal direction, i.e. the travel curve value at the Nth sampling point, then denotes the travel curve value at the Nth sampling point.

9. The control method of the travel curve-based generator circuit breaker control system according to claim 8, characterized by, The sampling frequency of the real-time acquisition of the stroke curve of the main branch circuit breaker contact is 100 kHz, that is, the time interval of each sampling point is 10 us.

10. The control method of the travel curve-based generator circuit breaker control system according to claim 7, characterized by, The opening time of the main branch circuit breaker is obtained by analyzing the change state between the actual measured change rate k and the theoretical change rate value, and the specific process is as follows: The calculation process of the actual measured change rate k is as follows: The opening time of the main branch circuit breaker is obtained by analyzing the change state between the actual measured change rate k and the theoretical change rate value, and the specific process is as follows: theoretical rate of change values, including theoretical rate of change values for two different phases and theoretical rate of change values ; The stroke curve of the main branch circuit breaker contact is collected in a discrete manner, and the main branch circuit breaker contact is started to separate as The time when the actual measured change rate k changes from to is recorded as ; and the time when the main branch circuit breaker is completed to be opened is recorded as ; When the main branch circuit breaker breaking time is When the main branch circuit breaker breaking time is When the main branch circuit breaker breaking time is When the main branch circuit breaker opening time The transfer capacitor branch contains a limited current resistance at this time, and the small capacity circuit breaker S1 is opened at this time to achieve complete disconnection of the generator outlet circuit breaker.

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