Intelligent diagnosis method and system applied to switch box output circuit
By generating a precharge curve in the switch box output circuit and determining whether the one-way change characteristics exceed the alarm threshold, the problem of inaccurate fault detection in the prior art is solved, and early warning is achieved before a fault occurs, reducing losses and reducing maintenance costs .
Patent Information
- Application Number
- CN202411424999.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2025-02-11
AI Technical Summary
In the prior art, the switch box output circuit is inaccurate in the detection of faults, which can easily lead to the expansion of the fault range and cause major losses.
By collecting the operating data of the access device and the current and voltage of the pre-charge circuit in the switch box output circuit during startup, a pre-charge curve reflecting the voltage and current changes of the device during startup are generated, and a one-way change characteristics are judged. Whether the set alarm threshold is exceeded, the pre-alarm and alarm will be triggered, and corresponding measures will be taken.
It realizes early warning before a fault occurs, reducing greater losses caused by the expansion of the fault, reducing maintenance costs, and enhancing overall stability.
Smart Images
Figure CN119414202A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an intelligent diagnosis method and system applied to a switch box output circuit, belonging to the field of power electronics. Background Art
[0002] In today's rapidly developing field of power electronics and intelligent control technology, with the booming development of industrial automation, smart home, new energy vehicles and other fields, the importance of the design of the switch box output circuit as a key link in power distribution and protection has become increasingly prominent. Research and application in this field have made significant progress at home and abroad, but in the face of increasingly complex and changing circuit environments and ever-increasing intelligent needs, existing technologies still have certain limitations. For example, inaccurate fault detection can easily lead to the expansion of the fault range and cause significant losses. Summary of the invention
[0003] The purpose of the present invention is to provide an intelligent diagnosis method and system for a switch box output circuit, so as to solve the problem in the prior art that the switch box output circuit is inaccurate in fault detection, which easily leads to the expansion of the fault range and causes significant losses.
[0004] To achieve the above object, the solution of the present invention includes: An intelligent diagnosis method for a switch box output circuit of the present invention comprises the following steps: According to the operation data of the connected equipment and the current and voltage of the pre-charging circuit in the output circuit of the switch box during the startup process, a pre-charging curve reflecting the voltage and current changes of the equipment during the startup process is generated; Determine whether the unidirectional change characteristic of the pre-charge curve exceeds a first alarm threshold in its unidirectional change direction, and trigger a pre-alarm when the first alarm threshold is exceeded; then continue to monitor the unidirectional change characteristic and determine whether the unidirectional change characteristic exceeds a second alarm threshold in its unidirectional change direction, and trigger an alarm when the second alarm threshold is exceeded; Among them, the operating data of the equipment is used to indicate the current amplitude-time curve during the equipment startup process, the current establishment process, and the voltage amplitude-rate curve during the voltage establishment process; the second alarm threshold is greater than the first alarm threshold; the unidirectional change characteristics include the continuous decrease in the voltage of the equipment or the continuous increase in the current of the equipment.
[0005] Furthermore, it also includes: When the second alarm threshold is not exceeded, the unidirectional change characteristic continues to be monitored and it is determined whether the unidirectional change characteristic exceeds the first alarm threshold in its unidirectional change direction.
[0006] Furthermore, when the voltage data collected in real time is continuously smaller than the historical data at the corresponding moment, it is considered that a unidirectional change feature occurs; or when the current data collected in real time is continuously larger than the historical data at the corresponding moment, it is considered that a unidirectional change feature occurs.
[0007] Furthermore, the pre-alarm includes: the pre-alarm indicator light is on, and the operation and maintenance personnel conduct maintenance; the alarm includes cutting off the power supply or starting the backup equipment.
[0008] Furthermore, the pre-charging circuit includes: a pre-charging resistor for current limiting, a capacitor for filtering and voltage stabilization, and a contactor for controlling the pre-charging resistor to join and exit the charging circuit.
[0009] An intelligent diagnosis system for a switch box output circuit of the present invention includes a processor, and the processor executes a computer program to implement the following method steps: According to the operation data of the connected equipment and the current and voltage of the pre-charging circuit in the output circuit of the switch box during the startup process, a pre-charging curve reflecting the voltage and current changes of the equipment during the startup process is generated; Determine whether the unidirectional change characteristic of the pre-charge curve exceeds a first alarm threshold in its unidirectional change direction, and trigger a pre-alarm when the first alarm threshold is exceeded; then continue to monitor the unidirectional change characteristic and determine whether the unidirectional change characteristic exceeds a second alarm threshold in its unidirectional change direction, and trigger an alarm when the second alarm threshold is exceeded; Among them, the operating data of the equipment is used to indicate the current amplitude-time curve during the equipment startup process, the current establishment process, and the voltage amplitude-rate curve during the voltage establishment process; the second alarm threshold is greater than the first alarm threshold; the unidirectional change characteristics include the continuous decrease in the voltage of the equipment or the continuous increase in the current of the equipment.
[0010] Furthermore, it also includes: when the second alarm threshold is not exceeded, then continue to monitor the unidirectional change feature and determine whether the unidirectional change feature exceeds the first alarm threshold in its unidirectional change direction.
[0011] Furthermore, when the voltage data collected in real time is continuously smaller than the historical data at the corresponding moment, it is considered that a unidirectional change feature occurs; or when the current data collected in real time is continuously larger than the historical data at the corresponding moment, it is considered that a unidirectional change feature occurs.
[0012] Furthermore, the pre-alarm includes: the pre-alarm indicator light is on, and the operation and maintenance personnel conduct maintenance; the alarm includes cutting off the power supply or starting the backup equipment.
[0013] Furthermore, the pre-charging circuit includes: a pre-charging resistor for current limiting, a capacitor for filtering and voltage stabilization, and a contactor for controlling the pre-charging resistor to join and exit the charging circuit.
[0014] The beneficial effects of the present invention are as follows: as a pioneering invention, the intelligent diagnosis method and system for the output circuit of a switch box of the present invention, first, by giving an early warning before a fault occurs, maintenance personnel can intervene in advance to reduce the occurrence of greater losses caused by the expansion of the fault; second, it reduces repeated maintenance work caused by misjudgment or missed judgment, and reduces maintenance costs; third, it can monitor the circuit status in real time, promptly discover and deal with potential problems, prevent faults from occurring, and thus enhance overall stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a flow chart of an intelligent diagnosis method applied to a switch box output circuit provided by an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a pre-charging circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0017] The idea of the present invention is to generate a pre-charging curve reflecting the voltage and current changes of the equipment during the startup process by collecting the operating data of the connected equipment and the current and voltage of the pre-charging circuit in the output circuit of the switch box during the startup process, and judge whether the unidirectional change characteristic of the pre-charging curve exceeds the first alarm threshold in its unidirectional change direction. When the first alarm threshold is exceeded, a pre-alarm is triggered; then continue to monitor the unidirectional change characteristic and judge whether the unidirectional change characteristic exceeds the second alarm threshold in its unidirectional change direction. When the second alarm threshold is exceeded, an alarm is triggered.
[0018] An embodiment of an intelligent diagnosis method applied to a switch box output circuit: Figure 1 is a flow chart of an intelligent diagnosis method for a switch box output circuit provided by an embodiment of the present invention, such as Figure 1 As shown, the method comprises the following steps: S101. After the switch box output circuit is connected to the device, a pre-charging curve of the connected device is formed according to the operation data of the connected device and the voltage and current of the pre-charging circuit in the switch box output circuit during the startup process.
[0019] Among them, the pre-charge curve reflects the voltage and current changes of the connected equipment during the startup process, and is an important basis for evaluating the equipment status; the equipment operation data refers to the current amplitude-time curve during the current establishment process during the equipment startup process, and the voltage amplitude-rate curve during the voltage establishment process.
[0020] The operating data of the connected equipment and the voltage and current data of the pre-charging circuit in the output circuit of the switch box during the startup process are collected. These data include both the current real-time collected data and the historical data over a period of time.
[0021] Among them, the voltage can be collected through a voltage sensor or a voltage transformer, etc., and the present invention does not make any special limitations on this; the current can be collected through a current sensor or a current transformer, etc., and the present invention does not make any special limitations on this.
[0022] Since the collected data may contain noise and outliers, which may affect the accuracy of the pre-charge curve, in order to make the pre-charge curve of the access device more accurate, as an optional implementation, the collected voltage and current as well as the operating data of the device will be cleaned, integrated and converted.
[0023] Among them, cleaning refers to filtering the data; integration refers to integrating data from different sources to form a complete data set; conversion refers to converting the collected analog data into digital quantities for subsequent processing.
[0024] Among them, the structural diagram of the pre-charging circuit can be referred to Figure 2 , Figure 2 is a schematic diagram of a pre-charging circuit provided by an embodiment of the present invention. Figure 2 As shown, the pre-charging circuit 100 includes: a power supply, a pre-charging group R, a capacitor C and a contactor K. The positive electrode ("+") of the power supply is connected to one end of the capacitor C through the pre-charging group R, and the other end of the capacitor C is connected to the negative electrode ("-") of the power supply. The contactor K is connected in parallel to both ends of the pre-charging group R, and the control end of the contactor K is used to connect to a control system (not shown).
[0025] Among them, the pre-charging resistor R is a current limiting resistor, and its main function is to limit the current at the initial stage of the pre-charging circuit startup to prevent damage to subsequent equipment or grid fluctuations due to instantaneous large currents. The resistance value of the pre-charging resistor R is selected based on the load characteristics of the connected equipment and the expected starting current to ensure that the current always remains within a safe range during the pre-charging process.
[0026] The connected devices refer to different electrical devices connected by users, such as refrigerators, air conditioners, electric vehicles, etc., which are not particularly limited in the present invention; the load characteristics of the equipment refer to the electrical characteristics and working rules of the equipment.
[0027] Among them, the capacitor C plays the role of energy storage and filtering in the pre-charging circuit 101. At the initial start-up of the pre-charging circuit 101, the capacitor C is charged through the pre-charging resistor R, gradually accumulating electric energy and smoothing the output voltage waveform, reducing the impact of voltage fluctuations on the subsequent equipment. As the capacitor C is charged, the voltage across it gradually rises. When the physical quantity of the capacitor C reaches a preset threshold, the capacitor C can be used as a temporary power supply support to provide a stable voltage environment for the subsequent equipment; the selection of the capacitance value of the capacitor C is designed according to the actual situation, and the present invention does not make any special restrictions on this.
[0028] Among them, the physical quantity of capacitor C can be the voltage across capacitor C, the charging time of capacitor C, the current change rate of capacitor C, etc. The present invention does not specifically limit this. The following will take the example that the physical quantity of capacitor C is the voltage across capacitor C as an example for exemplary explanation.
[0029] Among them, the contactor K is used as a control element of the pre-charging circuit 101 to control the connection or disconnection of the pre-charging circuit 101 with the main circuit. Before the pre-charging circuit 101 is started, the contactor K is in a disconnected state, and the pre-charging circuit 101 pre-charges the subsequent equipment through the pre-charging resistor R and the capacitor C. When the physical quantity of the capacitor C reaches / exceeds the preset threshold value (for example, the voltage across the capacitor C reaches a preset value), the contactor K is closed, and the pre-charging circuit 101 is connected to the connected equipment, so that the equipment starts and runs in a stable voltage environment.
[0030] In order to better monitor the operating status of the pre-charging circuit 101, as an optional implementation, the pre-charging circuit 101 is also provided with a voltage sensor (not shown) and a current sensor (not shown), which are respectively used to collect the voltage and current of the pre-charging circuit 101, and can report the voltage and current conditions of the pre-charging circuit 101 to the control system for subsequent calls.
[0031] The following explains Figure 2 The working principle of the pre-charge circuit is provided.
[0032] In the startup phase: the contactor K remains disconnected, the pre-charging resistor R is engaged in the work, and the power supply charges the capacitor C through the pre-charging resistor R. Due to the current limiting effect of the pre-charging resistor R, the charging current is controlled within a safe range. At the same time, the voltage sensor and current sensor monitor the current changes in real time to ensure the safety of the charging process.
[0033] In the transition phase: as the capacitor C is charged, the voltage across it gradually rises. When the voltage across the capacitor C reaches a preset threshold, the contactor K closes. At this time, the pre-charging circuit 101 is connected to the connected device, and the device starts and runs in a stable voltage environment.
[0034] In the stable operation stage: after the contactor K is closed, the pre-charging resistor R no longer works, but the capacitor C still exists as a filter element to further smooth the output voltage waveform and reduce the impact of voltage fluctuations on the subsequent equipment. At the same time, the voltage sensor and current sensor monitor the current changes in real time to ensure the safety of the charging process.
[0035] The voltage stabilization control strategy achieves voltage stabilization effects of different requirements by controlling the opening and closing time of the contactor K in the pre-charging circuit, or controlling the physical quantity at both ends of the capacitor C to reach / exceed the preset threshold.
[0036] The pre-charging circuit 101 achieves precise control of the starting current through the coordinated work of the pre-charging resistor R, capacitor C and contactor K, effectively protecting the subsequent equipment from the impact of surge current, ensuring that the subsequent equipment can smoothly transition to normal working state, improving the reliability and stability of the switch box output circuit, reducing equipment failures and grid fluctuations caused by voltage fluctuations; simplifying the structure of the switch box output circuit, reducing costs and maintenance difficulties.
[0037] S102, determine whether the unidirectional change characteristic of the pre-charging curve of the access device exceeds the first alarm threshold in its unidirectional change direction. If exceeded, trigger a pre-alarm and continue to execute step S103; if not exceeded, continue to monitor and determine whether it exceeds the first alarm threshold.
[0038] Among them, the unidirectional change characteristic of the pre-charging curve can be a continuous decrease in voltage, or a continuous increase in current, etc. The present invention does not specifically limit this. If the unidirectional change characteristic of the pre-charging curve is a continuous decrease in voltage, then whether the unidirectional change direction exceeds the first alarm threshold refers to whether the voltage is less than the first alarm threshold; if the unidirectional change characteristic of the pre-charging curve is a continuous increase in current, then whether the unidirectional change direction exceeds the first alarm threshold refers to whether the current is greater than the first alarm threshold. The unidirectional change characteristic of the pre-charging curve is a continuous decrease in voltage as an example for illustrative explanation. By continuously monitoring and analyzing the pre-charging curve of the same device and comparing the changing trends of historical data and current data, the unidirectional change characteristics of the pre-charging curve can be identified.
[0039] Specifically, by comparing the voltage and current change trends in historical data, the startup characteristics of the equipment under normal operation can be understood; according to the change trends of historical data, a reasonable first warning curve and a second warning curve are set, and the value on the first warning curve is called the first alarm threshold, and the value on the second warning curve is called the second alarm threshold. These thresholds are used to determine whether the change of the pre-charge curve is abnormal; by comparing the difference between current data and historical data, the unidirectional change characteristics of the pre-charge curve are identified. Among them, the second alarm threshold is greater than the first alarm threshold.
[0040] Taking voltage as an example, the voltage sensor can be used to know the voltage of the connected device at the current moment, and compare it with the historical data corresponding to the current moment of the device in the database (for example, if the current time is 5 pm, then find the voltage data corresponding to 5 pm in the database), and determine whether it is consistent with the historical data within the allowable error range. If it is consistent, it means that the connected device is within the safe operation range and no fault has occurred; if it is inconsistent, it will reflect that the voltage value of the connected device at the current moment is less than the historical data corresponding to the current moment in the database. The voltage sensor continues to collect the voltage value of the connected device at the next moment. If the voltage value at the next moment is still less than the historical data corresponding to the next moment in the database, it means that a unidirectional change feature has occurred.
[0041] When it is less than the first alarm threshold, it means that there is a potential problem with the connected device, but no failure has occurred yet. At this time, a pre-alarm will be triggered. The pre-alarm signal can be sent to the maintenance personnel through the indicator light, display screen or remote communication module, and the maintenance personnel will conduct maintenance. At the same time, the early warning information will be recorded and the corresponding diagnostic report will be generated to provide a reference for subsequent troubleshooting and processing.
[0042] S103. After triggering the early warning, continue to monitor the unidirectional change characteristics of the pre-filling curve and determine whether it exceeds the second alarm threshold. If it exceeds, trigger an alarm; if it does not exceed, continue monitoring and continue to execute step S102.
[0043] When it is less than the second alarm threshold, it means that the connected device has failed or is about to fail. At this time, an alarm will be triggered and necessary measures (such as cutting off power supply, starting backup equipment, etc.) will be taken to prevent the failure from escalating and reduce the occurrence of safety accidents.
[0044] An embodiment of the present invention provides an intelligent diagnosis method for a switch box output circuit. First, by issuing an early warning before a fault occurs, maintenance personnel can intervene in advance to reduce the occurrence of greater losses caused by the expansion of the fault; second, it reduces repeated maintenance work caused by misjudgment or missed judgment, thereby reducing maintenance costs; third, it can monitor the circuit status in real time, promptly discover and handle potential problems, prevent faults from occurring, and thus enhance overall stability.
[0045] An intelligent diagnostic system for switch box output circuits: An embodiment of the present invention provides an intelligent diagnosis system applied to a switch box output circuit, comprising: a processor, wherein the processor executes a computer program to implement an intelligent diagnosis method applied to the switch box output circuit.
[0046] Among them, the intelligent diagnosis method applied to the output circuit of the switch box can refer to the above related description, which will not be repeated here.
[0047] An intelligent diagnosis system applied to a switch box output circuit provided by an embodiment of the present invention can achieve the same beneficial effects as the aforementioned intelligent diagnosis method applied to a switch box output circuit, which will not be described in detail here.
Claims
1. An intelligent diagnosis method applied to the output circuit of a switch box, characterized in that: The steps include: Generate a pre-charging curve reflecting the voltage and current changes of the device during the startup process according to the operation data of the connected device and the current and voltage of the pre-charging circuit in the output circuit of the switch box during the startup process; Determine whether the unidirectional change characteristic of the pre-charging curve exceeds a first alarm threshold in its unidirectional change direction, and trigger a pre-alarm when the first alarm threshold is exceeded; then continue to monitor the unidirectional change characteristic and determine whether the unidirectional change characteristic exceeds a second alarm threshold in its unidirectional change direction, and trigger an alarm when the second alarm threshold is exceeded; Among them, the operating data of the device is used to indicate the current amplitude-time curve during the device startup process, the current establishment process, and the voltage amplitude-rate curve during the voltage establishment process; the second alarm threshold is greater than the first alarm threshold; the unidirectional change characteristics include the voltage of the device continuing to decrease or the current of the device continuing to increase.
2. The intelligent diagnosis method for the switch box output circuit according to claim 1 is characterized in that: Also includes: When the second alarm threshold is not exceeded, the unidirectional change characteristic continues to be monitored and it is determined whether the unidirectional change characteristic exceeds the first alarm threshold in its unidirectional change direction.
3. The intelligent diagnosis method for the switch box output circuit according to claim 1 is characterized in that: When the voltage data collected in real time is continuously smaller than the historical data at the corresponding moment, it is considered that the unidirectional change feature occurs; or when the current data collected in real time is continuously larger than the historical data at the corresponding moment, it is considered that the unidirectional change feature occurs.
4. The intelligent diagnosis method for the switch box output circuit according to claim 1, characterized in that: The pre-alarm includes: the pre-alarm indicator light is on, and the operation and maintenance personnel carry out maintenance; the alarm includes cutting off the power supply or starting the backup equipment.
5. The intelligent diagnosis method applied to the output circuit of the switch box according to any one of claims 1 to 4, characterized in that: The pre-charging circuit comprises: a pre-charging resistor for current limiting, a capacitor for filtering and voltage stabilization, and a contactor for controlling the pre-charging resistor to join and exit the charging circuit.
6. An intelligent diagnostic system applied to the output circuit of a switch box, characterized in that: The method comprises a processor, wherein the processor executes a computer program to implement the following method steps: Generate a pre-charging curve reflecting the voltage and current changes of the device during the startup process according to the operation data of the connected device and the current and voltage of the pre-charging circuit in the output circuit of the switch box during the startup process; Determine whether the unidirectional change characteristic of the pre-charging curve exceeds a first alarm threshold in its unidirectional change direction, and trigger a pre-alarm when the first alarm threshold is exceeded; then continue to monitor the unidirectional change characteristic and determine whether the unidirectional change characteristic exceeds a second alarm threshold in its unidirectional change direction, and trigger an alarm when the second alarm threshold is exceeded; Among them, the operating data of the device is used to indicate the current amplitude-time curve during the device startup process, the current establishment process, and the voltage amplitude-rate curve during the voltage establishment process; the second alarm threshold is greater than the first alarm threshold; the unidirectional change characteristics include the voltage of the device continuing to decrease or the current of the device continuing to increase.
7. The intelligent diagnosis system for switch box output circuit according to claim 6, characterized in that: Also includes: When the second alarm threshold is not exceeded, the unidirectional change characteristic continues to be monitored and it is determined whether the unidirectional change characteristic exceeds the first alarm threshold in its unidirectional change direction.
8. The intelligent diagnosis system for switch box output circuit according to claim 6, characterized in that: When the voltage data collected in real time is continuously smaller than the historical data at the corresponding moment, it is considered that the unidirectional change feature occurs; or when the current data collected in real time is continuously larger than the historical data at the corresponding moment, it is considered that the unidirectional change feature occurs.
9. The intelligent diagnosis system for switch box output circuit according to claim 6, characterized in that: The pre-alarm includes: the pre-alarm indicator light is on, and the operation and maintenance personnel carry out maintenance; the alarm includes cutting off the power supply or starting the backup equipment.
10. The intelligent diagnosis system applied to the output circuit of the switch box according to any one of claims 6 to 9, characterized in that: The pre-charging circuit comprises: a pre-charging resistor for current limiting, a capacitor for filtering and voltage stabilization, and a contactor for controlling the pre-charging resistor to join and exit the charging circuit.