Self-adaptive switching-on and switching-off control method for ultra-high-speed circuit breaker
By using the adaptive closing control method in the ultra-high-speed circuit breaker, the dynamic current threshold and the generation of the opening current interval are calculated, which solves the problem of insufficient accuracy in short-circuit fault detection, and improves the accuracy of the circuit breaker opening and system safety.
Patent Information
- Application Number
- CN202411899816.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-03-28
AI Technical Summary
During short-circuit fault detection of ultra-high-speed circuit breakers, due to sensor error, equipment aging and magnetic field interference, the short-circuit current feedback from the current transformer is close to but not reached the threshold, which reduces the accuracy of triggering the opening operation, increasing the probability of electrical equipment damage and safety accidents.
Adaptive closing control method is adopted to obtain the opening current threshold and historical current monitoring value of the circuit breaker, calculate the dynamic current threshold, generate the opening current interval, and generate the opening operation command based on the real-time current monitoring value, opening current interval and threshold to improve the opening accuracy of the circuit breaker.
It effectively improves the accuracy of circuit breaker opening, reduces the probability of damage to electrical equipment and safety accidents, and improves the reliability and safety of the system.
Smart Images
Figure CN119726558A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of circuit breaker equipment, and in particular to an adaptive closing and opening control method for an ultra-high-speed circuit breaker. Background Art
[0002] Ultra-high-speed circuit breakers refer to circuit breakers that can complete opening and closing actions in a very short time. Their operating speed is much faster than that of conventional circuit breakers. With the development of material science, manufacturing technology and drive technology, the performance of ultra-high-speed circuit breakers will continue to improve, and the operating time will be further shortened. The closing and opening actions of ultra-high-speed circuit breakers can be completed in a few milliseconds to tens of milliseconds. This type of circuit breaker is usually used in situations where it is necessary to quickly cut off the fault circuit or quickly restore power supply, such as ultra-high voltage power grids, new energy access and other fields.
[0003] The underlying basic logic of the operation of an ultra-high-speed circuit breaker (hereinafter referred to as a circuit breaker) or a device using a circuit breaker is to execute a trip command after sensing a short-circuit fault current, and to trip the circuit breaker, thereby cutting off the circuit and protecting electrical equipment and personnel safety.
[0004] In the actual application of circuit breakers, the following phenomenon exists: a short-circuit fault has indeed occurred. Due to factors such as sensor error, equipment aging, and magnetic field interference, the short-circuit current fed back by the current transformer is close to but has not reached the current threshold, which has triggered the circuit breaker's opening action.
[0005] However, this phenomenon of triggering the tripping action before the short-circuit current reaches the current threshold does not occur accurately every time. That is, a short-circuit fault has indeed occurred, and the current output by the current transformer is close to but has not reached the current threshold, but the circuit breaker does not perform the tripping action, which reduces the accuracy of the circuit breaker tripping and increases the probability of damage to electrical equipment and safety accidents. Summary of the invention
[0006] In order to improve the accuracy of circuit breaker opening, the present application provides an adaptive closing and opening control method for an ultra-high-speed circuit breaker.
[0007] The present application provides an adaptive closing and opening control method for an ultra-high-speed circuit breaker, which adopts the following technical solution:
[0008] An adaptive closing and opening control method for an ultra-high-speed circuit breaker, comprising:
[0009] Obtain the preset trip current threshold of the circuit breaker and the current monitoring value corresponding to the historical trip of the circuit breaker;
[0010] Comparing the opening current threshold with a plurality of the current monitoring values, and screening out the current monitoring values that do not reach the opening current threshold;
[0011] Calculating a dynamic current threshold based on a plurality of the current monitoring values that do not reach the trip current threshold;
[0012] Using the opening current threshold and the dynamic current threshold as interval endpoints, respectively, to generate an opening current interval;
[0013] Based on the current monitoring value acquired in real time, the opening current interval and the opening current threshold, an opening action instruction of the circuit breaker is generated.
[0014] Through the above technical solution, the system for controlling the opening of the circuit breaker can record the short-circuit current value (here refers to the current monitoring value fed back by the current transformer) each time the circuit breaker fails. That is to say, each time a single-phase grounding fault occurs, in the system records, theoretically, the corresponding current monitoring value can be found for each single-phase grounding fault.
[0015] Compare multiple current monitoring values with the trip current threshold, screen out the current monitoring values that do not reach the trip current threshold, and calculate the dynamic current value (see below for specific calculation). Since the screened current monitoring value is less than the current monitoring value, the trip current threshold is used as the right end point of the interval, and the dynamic current threshold is used as the left end point of the interval to generate a trip current interval. If the current monitoring value monitored in real time is less than the trip current threshold and is within the trip current interval, the circuit breaker is controlled to trip.
[0016] Since the current monitoring value is close to but has not reached the tripping current threshold, according to the tripping records recorded by the system, the current monitoring value has met the tripping conditions. This method can effectively improve the accuracy of circuit breaker tripping, thereby reducing the probability of damage to electrical equipment and safety accidents.
[0017] In a preferred example, the present application can be further configured as follows:
[0018] A two-dimensional coordinate system is formed by taking the number of opening times of the circuit breaker as the horizontal axis and the current monitoring value of the circuit breaker opening as the vertical axis, and a plurality of opening discrete points are generated in the two-dimensional coordinate system;
[0019] Based on the plurality of the opening discrete points, generating an opening fitting straight line;
[0020] A dynamic current threshold is generated according to the gate-off fitting straight line.
[0021] Through the above technical solution, a two-dimensional coordinate system is established with the number of openings as the horizontal coordinate and the current monitoring value as the vertical coordinate. The current monitoring values recorded by the historical openings are marked in the two-dimensional coordinate system to form a number of opening discrete points, which can intuitively reflect the distribution of the current monitoring values.
[0022] Then, fitting is performed based on multiple discrete points to generate a disconnection fitting straight line. Generally speaking, the type of single-phase grounding fault is relatively fixed, so the resulting straight line is a horizontal straight line, and the vertical coordinate of any point on the straight line is the dynamic current threshold; if the straight line is an inclined straight line, then the vertical coordinate of the intersection of the straight line and the longitudinal axis of the coordinate system is the dynamic current threshold.
[0023] The reason why the left endpoint value of the trip current interval is called the dynamic current threshold is that the dynamic current threshold determined by the trip fitting straight line will change every time the current monitoring value of a single-phase grounding fault is recorded by the system.
[0024] In a preferred example, the present application may be further configured as follows:
[0025] The gate-off fitting straight line is generated by combining a plurality of the gate-off discrete points through the least square method.
[0026] Through the above technical solution, in the above two-dimensional coordinate system, if the horizontal straight line where the trip current threshold is located is drawn (hereinafter referred to as the "reference straight line"), then the above-mentioned multiple trip discrete points are relatively concentrated in a certain range below the reference straight line. Then, based on the least squares method, a straight line can be fitted and generated by combining multiple trip discrete points, that is, the trip fitting straight line, so that the dynamic current threshold can be determined.
[0027] In a preferred example, the present application may be further configured such that after generating the tripping current interval, the following processing steps are further included:
[0028] Acquire multiple current monitoring values between the lowest current monitoring value and the dynamic current threshold, referred to as pending current values;
[0029] Obtaining occurrence frequencies corresponding to a plurality of the pending current values;
[0030] Screening out a specific current value according to the occurrence frequencies of the plurality of pending current values;
[0031] Based on the current monitoring value acquired in real time, the opening current interval, the opening current threshold and the specific current value, an opening action instruction of the circuit breaker is generated.
[0032] Through the above technical solution, multiple current monitoring values between the dynamic current threshold and the opening current threshold are used as the second opening judgment standard because they are already within the opening current interval (the first opening judgment standard is still the opening current threshold, which will be described in detail later). Although the multiple pending current values (i.e., multiple current monitoring values between the lowest current monitoring value and the dynamic current threshold) have not reached the lowest value of the opening current interval, the inducement of the short-circuit current value may be caused by the repeated occurrence of the same single-phase grounding fault, such as an object frequently touching the line at a fixed position, and the short-circuit current values generated by the same fault are relatively close or equal, so screening out these specific current values can further improve the accuracy of circuit breaker opening.
[0033] In a preferred example, the present application may be further configured such that the generating of the opening action instruction of the circuit breaker includes the following processing steps:
[0034] Prioritizing comparing the current monitoring value obtained in real time with the tripping current threshold;
[0035] If the current monitoring value acquired in real time is greater than or equal to the opening current threshold, a circuit breaker opening action instruction is generated; if the current monitoring value acquired in real time is less than the opening current threshold, it is determined whether the current monitoring value acquired in real time is within the opening current range;
[0036] If the current monitoring value acquired in real time is within the opening current interval, a circuit breaker opening action instruction is generated; if the current monitoring value acquired in real time is not within the opening current interval, it is determined whether the current monitoring value acquired in real time is equal to the specific current value;
[0037] If the current monitoring value obtained in real time is equal to the specific current value, a circuit breaker opening action instruction is generated; if the current monitoring value obtained in real time is not equal to the specific current value, the circuit breaker is kept closed.
[0038] Through the above technical solution, the priority of the circuit breaker opening judgment is as follows: first, the opening current threshold; second, the opening current range; third, the specific current value. The current monitoring value obtained in real time is compared in the above three rounds in sequence, and the short circuit caused by various faults is fully considered to determine whether the circuit breaker needs to be controlled to open, thereby fully improving the accuracy of the circuit breaker opening.
[0039] In a preferred example, the present application may be further configured as follows: screening out a specific current value according to the occurrence frequencies of the plurality of pending current values includes the following processing steps:
[0040] sorting the plurality of pending current values according to the magnitude of the occurrence frequency;
[0041] The undetermined current value with the highest occurrence frequency is obtained, which is called a specific current value.
[0042] Through the above technical solution, among multiple specific current values, the specific current value with the highest occurrence frequency has certain particularities. For example, at a fixed position or at a specific time, an object frequently touches the line, and the short-circuit current values generated by the same fault are relatively close or equal. Therefore, the frequency of occurrence of this specific current value is also relatively high. Therefore, the specific current value with the highest probability of occurrence is screened out, which can further improve the accuracy of circuit breaker opening.
[0043] In a preferred example, the present application may be further configured as follows: screening out a specific current value according to the occurrence frequencies of the plurality of pending current values includes the following processing steps:
[0044] sorting the plurality of pending current values according to the magnitude of the occurrence frequency;
[0045] Generate a tripping compensation current interval according to the undetermined current value with the highest occurrence frequency and the preset current fluctuation value;
[0046] The multiple current values corresponding to the opening compensation current interval are referred to as multiple specific current values.
[0047] Through the above technical scheme, short-circuit faults frequently caused by a specific reason may cause certain fluctuations in the current, that is, a small range of fluctuations occurs above and below the specific current value. The screened specific current value and the preset current fluctuation value (the current fluctuation value can be obtained based on the historical fault type judgment and the analysis of the corresponding current value) are combined to obtain the tripping compensation current interval, that is, the current fluctuation value is added or subtracted from the specific current value to obtain the interval endpoints of the tripping compensation current interval, thereby forming the tripping compensation current interval. The multiple current values included in this interval are all specific current values.
[0048] In a preferred example, the present application may be further configured such that after generating the gate-off compensation current interval, the following processing steps are further included:
[0049] Comparing the opening compensation current interval with the opening current zone;
[0050] If there is an overlap between the opening compensation current interval and the opening current interval or an overlap between endpoints, the overlapping interval or endpoint is removed from the opening compensation current interval.
[0051] Through the above technical solution, if there is interval overlap or endpoint overlap between the opening compensation current interval and the opening current interval, it indicates the overlapping numerical segments or specific numerical values, and the overlapping parts are removed from the opening compensation current interval to reduce the possibility of system disorder.
[0052] In summary, this application includes the following beneficial technical effects:
[0053] 1. By applying the system of this method, a multi-layer progressive opening judgment logic (i.e., a three-layer judgment logic, opening current threshold, opening current threshold and specific current value) is set, and the current value with the opening condition is screened out from multiple current monitoring values that have not reached the opening current threshold, thereby improving the accuracy of circuit breaker opening;
[0054] 2. This method can update the dynamic current threshold according to the current monitoring value of the short-circuit fault tripping in real time, thereby updating the tripping current range, thereby continuously improving the accuracy of circuit breaker tripping. BRIEF DESCRIPTION OF THE DRAWINGS
[0055] Figure 1 It is a flow chart of the closing and opening control method in the embodiment of the present application.
[0056] Figure 2 It is a schematic diagram of the process of generating a dynamic current threshold in an embodiment of the present application.
[0057] Figure 3 It is a flow chart of the generation of the opening action instruction in the embodiment of the present application.
[0058] Figure 4 It is a flow chart of circuit breaker opening determination in an embodiment of the present application.
[0059] Figure 5 It is a schematic diagram of the process of screening specific current values in the embodiment of the present application.
[0060] Figure 6 It is another schematic diagram of the process of screening specific current values in the embodiment of the present application.
[0061] Figure 7 It is a flowchart of processing interval overlap in an embodiment of the present application.
[0062] Figure 8 It is a schematic diagram of a two-dimensional coordinate system, a trip current threshold, a trip discrete point, and a trip current range in an embodiment of the present application. DETAILED DESCRIPTION
[0063] The following is combined with Figure 1 -Attached Figure 8 This application is described in further detail.
[0064] An embodiment of the present application discloses an adaptive closing and opening control method for an ultra-high-speed circuit breaker. The execution subject of the method may be a circuit breaker control system to which the method is applied.
[0065] See attached Figure 1As shown, an adaptive closing and opening control method for an ultra-high-speed circuit breaker includes the following processing steps:
[0066] S101. Obtain a preset trip current threshold of a circuit breaker and a current monitoring value corresponding to a historical trip of the circuit breaker.
[0067] In practice, each time a single-phase grounding fault occurs, in the system records, theoretically, it is possible to find the corresponding current monitoring value for each single-phase grounding fault, obtain the current monitoring value and the preset tripping current threshold, and proceed to the subsequent steps. Here, the current monitoring value refers to the current value fed back by the current transformer when a short-circuit fault occurs; the tripping current threshold refers to the judgment value of the circuit breaker action in the traditional tripping control method, which can be understood as follows: when the current monitoring value reaches the tripping current threshold, the circuit breaker is controlled to trip.
[0068] S102: Compare the opening current threshold with a plurality of current monitoring values, and select the current monitoring values that do not reach the opening current threshold.
[0069] In practice, the multiple current monitoring values recorded by the system can be divided into the following types according to their specific values and the trip current threshold: current monitoring values greater than or equal to the trip current threshold and current monitoring values less than the trip current threshold. If the current monitoring value is greater than or equal to the trip current threshold, the circuit breaker is tripped, which is a normal situation for the circuit breaker to be tripped. If the same situation occurs next time, there is a basis for judging the circuit breaker to be tripped again.
[0070] When the current monitoring value is less than the tripping current threshold, the circuit breaker trips. This is an abnormal situation. The next time the same situation occurs, the circuit breaker may not be able to trip in time. At this time, according to the tripping current threshold, the current monitoring values that reach the tripping current threshold are screened out. On the one hand, the calculation sample of the subsequent dynamic current threshold is reduced. On the other hand, the dynamic current threshold is calculated based on data with practical reference significance.
[0071] S103: Calculate a dynamic current threshold based on multiple current monitoring values that do not reach the tripping current threshold.
[0072] In implementation, the relevant specific calculations are described later.
[0073] S104, generating a trip current interval with the trip current threshold and the dynamic current threshold as interval endpoints.
[0074] In implementation, since the screened current monitoring value is less than the current monitoring value, the trip current threshold is used as the right end point of the interval and the dynamic current threshold is used as the left end point of the interval to generate the trip current interval. For the comparison of the numerical values involved in this paragraph, please refer to the attached Figure 8 shown.
[0075] The reason why the left endpoint value of the trip current interval is called the dynamic current threshold is that the dynamic current threshold determined by the trip fitting straight line will change every time the current monitoring value of a single-phase grounding fault is recorded by the system.
[0076] S105: Generate a circuit breaker opening action instruction based on the current monitoring value, the opening current interval and the opening current threshold value acquired in real time.
[0077] In implementation, whether the circuit breaker needs to be controlled to open is determined based on the real-time acquired current monitoring value, opening current interval and opening current threshold. For the relevant specific determination priority and determination principle, please refer to the relevant description in step S5 below.
[0078] See attached Figure 2 Shown and attached Figure 8 As shown, the processing steps for calculating the dynamic current threshold are as follows:
[0079] S201. A two-dimensional coordinate system is formed with the number of times the circuit breaker is opened as the horizontal axis and the current monitoring value of the circuit breaker opening as the vertical axis, and a plurality of opening discrete points are generated in the two-dimensional coordinate system.
[0080] In implementation, the two-dimensional coordinate system uses the number of times the circuit breaker is opened as the horizontal axis (i.e., the X-axis, marked as K) and the current monitoring value of the circuit breaker opening as the vertical axis (i.e., the Y-axis, marked as I). Multiple current monitoring values recorded by the system are marked in the coordinate system to form multiple discrete points, called opening discrete points, which intuitively reflect the distribution of current monitoring values.
[0081] Since the above-mentioned multiple opening discrete points have all been screened by the opening current threshold, the opening discrete points are evenly distributed on the straight line where the opening current threshold is located (see Appendix Figure 8 y=a, a is below the tripping current threshold).
[0082] S202: Generate a gate-opening fitting straight line based on a plurality of gate-opening discrete points.
[0083] In implementation, multiple discrete points are used to generate gate fitting lines according to a certain fitting logic.
[0084] S203: Generate a dynamic current threshold value according to the opening gate fitting straight line.
[0085] In implementation, generally speaking, the type of single-phase grounding fault is relatively fixed, so the resulting straight line is a horizontal straight line, that is, the straight line where Y=b is located in the coordinate system, and the vertical coordinate of any point on the straight line is the dynamic current threshold; if the straight line is an inclined straight line, then the vertical coordinate of the intersection of the straight line and the longitudinal axis of the coordinate system is the dynamic current threshold.
[0086] See attached Figure 2As shown, in step S202, a gate-opening fitting straight line is generated, and the gate-opening fitting straight line can be generated by combining a plurality of gate-opening discrete points in the coordinate system through the least square method.
[0087] See attached Figure 3 and attached Figure 8 As shown, after step S104, the following processing steps may also be included:
[0088] S301 . Acquire multiple current monitoring values between the lowest current monitoring value and the dynamic current threshold, which are referred to as pending current values.
[0089] In implementation, multiple current monitoring values between the lowest current monitoring value and the dynamic current threshold are obtained and displayed in a coordinate system, that is, the vertical coordinates of multiple discrete points below the straight line where Y=b is located in the coordinate system are obtained.
[0090] S302, obtaining occurrence frequencies corresponding to a plurality of pending current values.
[0091] S303: Screen out a specific current value according to the occurrence frequencies of multiple pending current values.
[0092] In implementation, the specific current values screened out have certain particularities. For example, at a fixed location in a certain period of time, an object frequently touches the line, and the short-circuit current values generated by the same fault are relatively close or equal. Therefore, the frequency of short-circuit faults corresponding to the specific current value is obviously different from other faults. Screening out the short-circuit faults corresponding to the specific current value and adding them to the opening judgment logic can further improve the accuracy of circuit breaker opening.
[0093] The specific current value serves as the third judgment criterion of the closing and opening control method.
[0094] S304: Generate a circuit breaker opening action instruction based on the current monitoring value, the opening current interval, the opening current threshold and the specific current value acquired in real time.
[0095] In implementation, the current monitoring value obtained in real time refers to the fault current value collected by the current transformer in real time, and the tripping current range, tripping current threshold and specific current value are the judgment criteria for circuit breaker tripping, which can also be understood as judgment logic. The specific judgment process is shown in the specific description of step S4 in the following text.
[0096] See attached Figure 4 and attached Figure 8 As shown, in step S105, generating a circuit breaker opening action instruction includes the following processing steps:
[0097] S401. Preferentially compare the current monitoring value acquired in real time with the tripping current threshold.
[0098] In practice, the tripping current threshold, as the preset tripping standard, remains the unshakable first judgment logic.
[0099] S402. If the current monitoring value acquired in real time is greater than or equal to the opening current threshold, a circuit breaker opening action instruction is generated; if the current monitoring value acquired in real time is less than the opening current threshold, it is determined whether the current monitoring value acquired in real time is within the opening current range.
[0100] In practice, if the current monitoring value obtained in real time is marked on the attached Figure 8 In the coordinate system, it is displayed as a certain coordinate point. If the coordinate point is on the straight line where Y=a or above the straight line, the circuit breaker opening action instruction is generated; if the coordinate point is below the straight line where Y=a, it is determined whether the coordinate point is within the opening current range, that is, within the range from a to b.
[0101] S403. If the current monitoring value acquired in real time is within the opening current range, a circuit breaker opening action instruction is generated; if the current monitoring value acquired in real time is not within the opening current range, it is determined whether the current monitoring value acquired in real time is equal to a specific current value.
[0102] Here, the description of the coordinate system in step S402 is continued. In implementation, if the coordinate point is within the interval from a to b, a circuit breaker opening action instruction is generated; if the coordinate point is not within the interval from a to b, it is determined whether the ordinate of the coordinate point is equal to a specific current value.
[0103] S404: If the current monitoring value obtained in real time is equal to the specific current value, an opening action instruction of the circuit breaker is generated; if the current monitoring value obtained in real time is not equal to the specific current value, the circuit breaker is kept closed.
[0104] Here, the description of the coordinate system in step S402 and S403 is continued. In implementation, if the ordinate of the coordinate point is equal to the specific current value, a circuit breaker opening action instruction is generated; if the ordinate of the coordinate point is not equal to the specific current value, the circuit breaker is kept closed.
[0105] See attached Figure 5 and attached Figure 8 As shown, in step S303, the specific processing steps for screening out the specific current value may be as follows:
[0106] S501 , sorting a plurality of pending current values according to the magnitude of the occurrence frequency.
[0107] S502: Obtain a pending current value with the highest occurrence frequency, which is referred to as a specific current value.
[0108] In practice, the frequency of occurrence of the selected specific current value is the highest, which means that the short-circuit fault corresponding to the current value occurs frequently, has certain particularity (as explained above), and has the conditions for tripping. The specific current value is reflected in the coordinate system as the straight line where Y=c is located. The number of discrete points of tripping distributed on this straight line is the largest, that is, the probability of occurrence is the highest.
[0109] See attached Figure 6 and attached Figure 8 As shown, in step S303, the specific processing steps for screening out the specific current value may also be as follows:
[0110] S601. Sort multiple pending current values according to the magnitude of occurrence frequency.
[0111] S602: Generate a tripping compensation current interval according to the undetermined current value with the highest occurrence frequency and a preset current fluctuation value.
[0112] In practice, short circuit faults frequently caused by a specific reason may cause the current to fluctuate to a certain extent, that is, a small range of fluctuations may occur above and below the specific current value. Figure 8 The value of d in the figure can be obtained based on the historical fault type judgment and the analysis of the corresponding current value). Since the specific current value is c and the current fluctuation value is d, the opening compensation current interval is cd to c+d. The straight line where the endpoints of the opening compensation current interval are located is shown in the attached figure. Figure 8 Indicated by dotted lines.
[0113] S603: The multiple current values corresponding to the opening compensation current interval are referred to as multiple specific current values.
[0114] In implementation, the multiple current values included in the opening compensation current interval are multiple specific current values.
[0115] Here, for the attached Figure 8 The symbols in the two-dimensional coordinate system shown are explained. The horizontal coordinate axis K represents the number of times the circuit breaker is opened; the vertical coordinate axis I represents the current monitoring value of the circuit breaker; a represents the opening current threshold; b represents the dynamic current threshold; c represents a specific current value (one or more); d represents the current fluctuation value; the interval from a to b represents the opening current interval; cd to c+d represents the opening compensation current interval; the multiple hollow circles in the figure represent discrete opening points.
[0116] See attached Figure 7 and attached Figure 8 As shown, after the gate opening compensation current interval is generated in step S602, the following processing steps are also included:
[0117] S701. Compare the opening compensation current interval and the opening current zone.
[0118] S702: If there is an overlap between the opening compensation current interval and the opening current interval or an overlap between endpoints, the overlapping interval or endpoint is removed from the opening compensation current interval.
[0119] In implementation, if there is overlap between the opening compensation current interval and the opening current interval, it will directly affect the opening judgment logic of the circuit breaker. Therefore, removing the overlapping intervals or endpoints from the opening compensation current interval can improve the opening judgment logic and reduce the possibility of system disorder.
[0120] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application in turn. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. An adaptive closing and opening control method for an ultra-high-speed circuit breaker, characterized in that: The method comprises: Obtain the preset trip current threshold of the circuit breaker and the current monitoring value corresponding to the historical trip of the circuit breaker; Comparing the opening current threshold with a plurality of the current monitoring values, and screening out the current monitoring values that do not reach the opening current threshold; Calculating a dynamic current threshold based on a plurality of the current monitoring values that do not reach the trip current threshold; Using the opening current threshold and the dynamic current threshold as interval endpoints, respectively, to generate an opening current interval; Based on the current monitoring value acquired in real time, the opening current interval and the opening current threshold, an opening action instruction of the circuit breaker is generated.
2. The adaptive closing and opening control method of an ultra-high-speed circuit breaker according to claim 1, characterized in that: The processing steps for calculating the dynamic current threshold are as follows: A two-dimensional coordinate system is formed by taking the number of opening times of the circuit breaker as the horizontal axis and the current monitoring value of the circuit breaker opening as the vertical axis, and a plurality of opening discrete points are generated in the two-dimensional coordinate system; Based on the plurality of the opening discrete points, generating an opening fitting straight line; A dynamic current threshold is generated according to the gate-off fitting straight line.
3. The adaptive closing and opening control method of an ultra-high-speed circuit breaker according to claim 2, characterized in that: The processing steps for generating the gate-opening fitting straight line are as follows: The gate-off fitting straight line is generated by combining a plurality of the gate-off discrete points through the least square method.
4. The adaptive closing and opening control method of an ultra-high-speed circuit breaker according to claim 3, characterized in that: After the generating of the tripping current interval, the following processing steps are also included: Acquire multiple current monitoring values between the lowest current monitoring value and the dynamic current threshold, referred to as pending current values; Obtaining occurrence frequencies corresponding to a plurality of the pending current values; Screening out a specific current value according to the occurrence frequencies of the plurality of pending current values; Based on the current monitoring value acquired in real time, the opening current interval, the opening current threshold and the specific current value, an opening action instruction of the circuit breaker is generated.
5. The adaptive closing and opening control method of an ultra-high-speed circuit breaker according to claim 4, characterized in that: The generating of the opening action instruction of the circuit breaker comprises the following processing steps: Prioritizing comparing the current monitoring value obtained in real time with the tripping current threshold; If the current monitoring value acquired in real time is greater than or equal to the opening current threshold, a circuit breaker opening action instruction is generated; if the current monitoring value acquired in real time is less than the opening current threshold, it is determined whether the current monitoring value acquired in real time is within the opening current range; If the current monitoring value acquired in real time is within the opening current range, generating an opening action instruction for the circuit breaker; If the current monitoring value acquired in real time is not within the opening current interval, determining whether the current monitoring value acquired in real time is equal to the specific current value; If the current monitoring value obtained in real time is equal to the specific current value, a circuit breaker opening action instruction is generated; if the current monitoring value obtained in real time is not equal to the specific current value, the circuit breaker is kept closed.
6. The adaptive closing and opening control method of an ultra-high-speed circuit breaker according to claim 4, characterized in that: The method of screening out a specific current value according to the occurrence frequencies of the plurality of pending current values comprises the following processing steps: sorting the plurality of pending current values according to the magnitude of the occurrence frequency; The undetermined current value with the highest occurrence frequency is obtained, which is called a specific current value.
7. The adaptive closing and opening control method of an ultra-high-speed circuit breaker according to claim 4, characterized in that: The method of screening out a specific current value according to the occurrence frequencies of the plurality of pending current values comprises the following processing steps: sorting the plurality of pending current values according to the magnitude of the occurrence frequency; Generate a tripping compensation current interval according to the undetermined current value with the highest occurrence frequency and the preset current fluctuation value; The multiple current values corresponding to the opening compensation current interval are referred to as multiple specific current values.
8. The adaptive closing and opening control method of an ultra-high-speed circuit breaker according to claim 7, characterized in that: After the generating of the opening compensation current interval, the following processing steps are also included: Comparing the opening compensation current interval with the opening current zone; If there is an overlap between the opening compensation current interval and the opening current interval or an overlap between endpoints, the overlapping interval or endpoint is removed from the opening compensation current interval.