Charging and discharging control method and system for circuit breaker synthesis test
By using a charge and discharge control device in the circuit breaker synthesis test, the capacitance voltage and displacement are monitored and controlled in real time, and the trajectory tracking algorithm and pulse width modulation technology are used to solve the problems of large timing error and low efficiency in traditional methods, which improves the test success rate and efficiency.
Patent Information
- Application Number
- CN202411322854.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2024-12-27
AI Technical Summary
In the circuit breaker synthesis test, the traditional method has large timing errors in the switching operation, which leads to a high probability of failure and is difficult to accurately control the capacitor charging and discharging process, which affects efficiency.
A charging and discharging control device is designed, including a controller, a light-controlled delay plate, a capacitor charging module, a charging voltage monitoring module and a contact displacement monitoring module. By monitoring the capacitor voltage and displacement information in real time, using a trajectory tracking algorithm and pulse width Modulation technology, precisely control the capacitance charge and discharge timing and speed.
It significantly reduces the errors between the actual operation timing and the set timing, improves the success rate of circuit breaker synthesis test, and reduces labor intensity and time.
Smart Images
Figure CN119199502A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of power equipment detection, and specifically discloses a charge and discharge control method and system for circuit breaker synthesis test. Background Art
[0002] With the continuous deepening of electrical research, electrical operating devices are gradually developing towards intelligence and simplicity. Circuit breakers play a vital role in power systems. During the design and manufacturing process of circuit breakers, synthetic tests must be carried out to test the opening and closing performance of circuit breakers.
[0003] The traditional synthetic test is to set the opening and closing sequence of the switch, and the circuit breaker operates in sequence to complete the synthetic test. However, there is a certain dispersion in the operating time of the circuit breaker during the test, that is, there will be errors between the set sequence and the actual operation sequence, making the circuit breaker synthetic test difficult, and even with a failure probability of up to 50%. It consumes a lot of labor and has low efficiency.
[0004] In the circuit breaker synthesis test, the switch operating mechanism needs to be controlled, and each opening and closing operation must be charged and discharged. Since the discharge process of the capacitor is a single second-order sinusoidal discharge process or a first-order exponential discharge process, it is difficult to control and simulate the actual circuit breaker disconnection through a single discharge function. Therefore, how to choose to charge the capacitor as a whole or charge a certain capacitor separately, monitor the current source capacitor, voltage source capacitor, and operating mechanism capacitor voltage in real time, and intelligently eliminate damaged capacitors; accurately control the synthesis timing and discharge speed, realize real-time monitoring of the amount of electricity in the capacitor charging process, and accurately control the discharge timing and speed are problems that need to be solved by technical personnel in this field. Summary of the invention
[0005] In order to solve the above technical problems, the present invention provides a charge and discharge control device for circuit breaker synthesis test, comprising: a controller for charge and discharge and reset timing control, a light-controlled delay board, an AC power supply, a capacitor charging module, a charging capacitor group, a charging voltage monitoring module, a contact displacement monitoring module, and a display module; the primary side of the capacitor charging module is electrically connected to the AC power supply, and the secondary side of the capacitor charging module is electrically connected to the charging capacitor group; the charging capacitor group is formed by a plurality of charge and discharge branches connected in parallel, each charge and discharge branch is composed of a switch, a diode and a capacitor connected in series, and the capacitor in each charge and discharge branch is connected in series. The positive electrode is connected to the positive electrode of the thyristor, the negative electrode of the thyristor is connected in series with the operating mechanism coil and then connected to the negative electrode of the capacitor, the positive electrode of the light-controlled delay board is connected to the thyristor gate, and the negative electrode is connected to the negative electrode of the thyristor. The charging voltage monitoring module includes a voltmeter connected in parallel with each capacitor and a digital-to-analog converter electrically connected to the voltmeter; the controller is respectively communicated with the capacitor charging module, the thyristor gate, the light-controlled delay board, the digital-to-analog converter, the contact displacement monitoring module and the display module. The light-controlled delay board is used to control the capacitor discharge, complete the reset operation and control the introduction of the voltage source of the synthetic test circuit by setting the delay trigger signal.
[0006] Preferably, the diode and capacitor are connected in series as a single diode connected in series with a single capacitor.
[0007] Preferably, a switch is provided on the primary side of the capacitor charging module electrically connected to the AC power supply, and a switch is provided on the secondary side of the capacitor charging module electrically connected to the charging capacitor group.
[0008] Based on the same inventive concept, a charge and discharge control method for a circuit breaker synthesis test is also disclosed, using the above device, comprising the following steps:
[0009] S1. Divide the control circuit of the charge and discharge control device for circuit breaker synthesis test into a charge control module, a discharge control module, a reset module, a charge voltage monitoring module, and a contact displacement monitoring module according to the function, and lead the input and output interfaces of each module to the control panel, wherein the input and output interfaces include but are not limited to keyboards, switches, buttons, voltage meters, and display screens;
[0010] S2. When the capacitor is automatically charged, the charging voltage monitoring module transmits the voltage signal to the controller to detect whether the preset charging voltage is reached. When the charging voltage reaches the preset value, charging stops. When the capacitor voltage remains unchanged after the charging switch is closed, or the capacitor voltage drops too fast after reaching the rated voltage, the controller will issue a command to actively exit the charging stage.
[0011] S3. During discharge, the light-controlled delay board controls the introduction of the synthesis circuit voltage source, and controls the discharge of the charge and discharge module by setting a delay trigger signal, so that the displacement of the contact driven by the operating mechanism tracks its empirical trajectory;
[0012] S4. During reset, the button is used to control the switch, connecting the positive electrode and gate electrode of the thyristor on the charge and discharge module, and the reset time of the operating mechanism is controlled by the light-controlled delay board.
[0013] Preferably, the tracking includes the following steps: collecting actual contact displacement information, comparing it with the empirical trajectory, extracting the empirical discharge speed curve corresponding to the empirical trajectory, programming to output waveforms with different duty cycles through a pulse width modulation output module, controlling the opening and closing of the IGBT to achieve control of the discharge speed, and tracking the empirical discharge speed curve; the programming also includes comparing the phase, angular velocity and linear velocity of the empirical trajectory curve and the actual trajectory curve, and after iteration, combining the kinematic model and based on the control law, reducing the error between the actual trajectory and the empirical trajectory at discrete points.
[0014] Another embodiment of the present invention is to provide a non-transitory readable recording medium for storing one or more programs including a plurality of instructions. When the instructions are executed, the processor will execute the above-mentioned charge and discharge control method for circuit breaker synthesis test.
[0015] Another embodiment of the present invention is to provide a charge and discharge control system for a circuit breaker synthesis test, including a processing circuit and a memory electrically coupled thereto, wherein the memory is configured to store at least one program, wherein the program includes a plurality of instructions, and the processing circuit runs the program to execute the above-mentioned charge and discharge control method for a circuit breaker synthesis test.
[0016] Compared with the prior art, the present invention produces the following beneficial effects:
[0017] By real-time monitoring of the current source capacitor, voltage source capacitor, and operating mechanism capacitor voltage, damaged capacitors can be intelligently eliminated; choose to charge the capacitor as a whole or charge a certain capacitor separately. According to the trajectory tracking algorithm, the operating mechanism speed compensation is performed through the displacement and current feedback method to control the discharge sequence and speed, thereby accurately controlling the synthesis sequence and discharge speed, and controlling the capacitor discharge according to the given curve. The error between the actual action sequence and the set sequence is reduced, and the probability of successful circuit breaker synthesis test is increased. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a wiring diagram of a charge and discharge control device used for a circuit breaker synthesis test in an embodiment of the present invention;
[0019] Figure 2 is a capacitor charging and discharging electrical schematic diagram for circuit breaker synthesis test in an embodiment of the present invention;
[0020] Figure 3 1 is a schematic diagram of the connection between the capacitor and the operating mechanism in an embodiment of the present invention;
[0021] Figure 4 is a displacement curve of a tracking mechanism of a trajectory tracking algorithm in an embodiment of the present invention;
[0022] Figure 5 This is a schematic diagram of the control panel partitions in an embodiment of the present invention;
[0023] In the figure, ZCC is the capacitor charging module, S1 is the device switch, S2 is the main switch for closing (opening), S3, S4, S5... are small switches for closing (opening) charging. D1, D2, D3...D10 are diodes, C1, C2, C3...C10 are charging capacitors, Ci represents any capacitor or capacitor combination, Q1 is a thyristor, and the gate level is connected to the control delay board. L1 is the closing (opening) coil of the operating mechanism. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making innovative efforts are within the scope of protection of the present invention.
[0025] In conjunction with the accompanying drawings of the specification, an embodiment of a charge and discharge control device for circuit breaker synthesis test is as follows: Figure 1-3 As shown,
[0026] Ten thyristors (expandable to n) are set, corresponding to 10 capacitors (expandable to n). Capacitors 1-5 and 6-10 are connected in common cathode and connected to terminal block 1. A single switch, a single diode, and a single capacitor are connected in series along the charging current direction to form a charging branch. Terminal block 2 is connected to the negative electrode of the thyristor to form a discharge circuit. Terminal block 3 is connected to the positive electrode of the thyristor, and terminal block 4 is connected to the gate level of the thyristor. Through the external light-controlled delay board and the inching button, the thyristor is controlled to self-conduct, thereby performing discharge and reset operations. During charging, multiple charging branches are integrated into a charging capacitor group through terminal blocks 1 and 3. The capacitor charging module is used to control the charging process. Its primary side is electrically connected to the AC power supply, and the secondary side is electrically connected to the charging capacitor group; it is connected to the controller through a built-in digital-to-analog converter, and can monitor the voltage and receive charging instructions issued by the controller. Each diode is connected in series with only one capacitor to prevent the capacitor voltage from affecting the charging end, so that the power is always kept in the capacitor, and other capacitors will not be charged in reverse. When the charging voltage reaches the preset value, charging stops. The controller is also connected to the thyristor gate, light-controlled delay board, contact displacement monitoring module and display module. The light-controlled delay board is used to control capacitor discharge, complete reset operation and control the introduction of voltage source of the synthetic test circuit by setting a delay trigger signal.
[0027] A switch is provided on the primary side of the capacitor charging module and electrically connected to the AC power supply, and a switch is provided on the secondary side of the capacitor charging module and electrically connected to the charging capacitor group.
[0028] The controller has a built-in CPU28335 for discharge timing and speed control. It applies a trajectory tracking algorithm, collects displacement information through the AD7606 high-precision analog-to-digital conversion chip, compares it with the discharge speed curve stored in advance, and then outputs waveforms with different duty cycles through the PWM (pulse width modulation) output module, thereby controlling the opening and closing of the IGBT to control the discharge speed and track the known curve. The tracking curve can be obtained by tracking the known mechanism displacement curve through MATLAB programming.
[0029] The use of the above device to complete the charge and discharge control for the circuit breaker synthesis test constitutes an embodiment of a charge and discharge control method for the circuit breaker synthesis test:
[0030] The control circuit of the charge and discharge control device for circuit breaker synthesis test is divided into a charge control module, a discharge control module, a reset module, a charge voltage monitoring module, and a contact displacement monitoring module according to the function, and the input and output interfaces of each module (including but not limited to keyboard, knife switch, push button switch, voltmeter and display screen) are connected to the control panel, and the charge operation area, voltmeter display area, reset area and main control area (such as Figure 5 As shown in the figure, the charging operation area is divided into a manual charging area and an automatic charging area. The operation logic of the manual closing operation area is: if the closing capacitors are charged uniformly, the secondary switches 6-10 are closed first, and then the opening and closing of the primary switch are controlled to perform unified charging control; if the closing capacitors are controlled individually, the primary switch needs to be closed first and then the secondary switch of the corresponding charging capacitor is controlled to achieve individual control; the opening operation is opposite to the closing operation, thereby achieving hierarchical control of capacitor charging. In the automatic charging area, the input voltage value can be preset through the keyboard. After charging is turned on, the voltage value is detected and fed back to the main controller after reaching the preset voltage value, and the main controller controls the charging to end. In the voltmeter display area, the meter for monitoring voltage uses a liquid crystal display header. The reset area is controlled by a jog switch, which is connected to the wiring banks 3 and 4 on the charge and discharge module to control the reset of the operating mechanism. CPU28335 is used to monitor the capacitor voltage. If the capacitor voltage remains unchanged after the charging switch is closed, or the capacitor voltage drops too fast after reaching the rated voltage, the control board will actively exit the charging stage to prevent other capacitors from overcharging. The light-controlled delay board controls the discharge of the charge and discharge module by setting a delay trigger signal, so that the operating mechanism can move in an orderly manner. In addition, the light-controlled delay board can also complete the reset operation and control the introduction of the voltage source of the synthesis circuit.
[0031] The breaking force of the mechanical switch is the breaking motion of the compression spring, and its breaking process can be regarded as the superposition of the sinusoidal motion process of the ideal spring and the actual motion process of the limited breaking.
[0032] i is a positive integer used to sort the parameters in the differential time period. The subscript r indicates the actual value of the parameter, and the subscript e indicates the error of the parameter. ω is the angular velocity of the sinusoidal motion process, V is the velocity, and X is the displacement. Therefore, the actual initial angular velocity ω r (1), initial velocity V r (1), Xr is the displacement of the actual position, the number of discrete points is determined according to the number of path points of the tracked trajectory, the tracked trajectory is segmented into straight lines, the interval between adjacent discrete points is a new tracked trajectory, and each segment is further divided into several time periods, as shown in formula (1).
[0033] dx=x (i+1) -x i (1)
[0034] The kinematic model of the entire tracking trajectory and the actual trajectory is shown in formula (2), where thr (i) is the angle (phase) of the tracked trajectory, th (i) is the actual trajectory angle:
[0035]
[0036] The tracking error for each segment is:
[0037]
[0038] The control rate calculation formula of the algorithm is shown in formula (4), where c1 and c2 are error correction coefficients:
[0039]
[0040] By comparing the position, angular velocity and linear velocity of the tracked trajectory (i.e. the empirical trajectory in the invention) and the actual trajectory, after iteration, combined with the kinematic model, under the control law, the tracking error between the actual trajectory and the tracked trajectory at discrete points can be reduced (see Figure 4 ).
[0041] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computers, available storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.
[0042] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.
[0043] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.
[0044] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.
[0045] Therefore, compiling the above method steps into a program and then storing it on a hard disk or other non-transitory storage medium constitutes the technical solution of "a non-transitory readable recording medium" of the present invention; and electrically connecting the storage medium to a computer processor, and completing the charge and discharge control for the circuit breaker synthesis test through data processing, constitutes the technical solution of "a charge and discharge control system for circuit breaker synthesis test" of the present invention.
[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A charge and discharge control device for circuit breaker synthesis test, characterized in that include: A controller for charge, discharge and reset timing control, a light-controlled delay board, an AC power supply, a capacitor charging module, a charging capacitor group, a charging voltage monitoring module, a contact displacement monitoring module, and a display module; the primary side of the capacitor charging module is electrically connected to the AC power supply, and the secondary side of the capacitor charging module is electrically connected to the charging capacitor group; the charging capacitor group is composed of multiple charging and discharging branches in parallel, each charging and discharging branch is composed of a switch, a diode and a capacitor in series, the positive electrode of the capacitor in each charging and discharging branch is turned on by the positive electrode of the thyristor, and the negative electrode of the thyristor is connected in series to operate The mechanism coil is connected to the negative electrode of the capacitor, the positive electrode of the light-controlled delay board is connected to the thyristor gate, and the negative electrode is connected to the negative electrode of the thyristor. The charging voltage monitoring module includes a voltmeter connected in parallel with each capacitor and a digital-to-analog converter electrically connected to the voltmeter; the controller is respectively communicated with the capacitor charging module, the thyristor gate, the light-controlled delay board, the digital-to-analog converter, the contact displacement monitoring module and the display module. The light-controlled delay board is used to control the capacitor discharge, complete the reset operation and control the introduction of the voltage source of the synthetic test circuit by setting the delay trigger signal.
2. A charge and discharge control device for circuit breaker synthesis test according to claim 1, characterized in that: The diode and capacitor are connected in series in the form of a single diode connected in series with a single capacitor.
3. A charge and discharge control device for circuit breaker synthesis test according to claim 2, characterized in that: A switch is provided on the primary side of the capacitor charging module and electrically connected to the AC power supply, and a switch is provided on the secondary side of the capacitor charging module and electrically connected to the charging capacitor group.
4. A charge and discharge control method for circuit breaker synthesis test, using a charge and discharge control device for circuit breaker synthesis test according to any one of claims 1 to 3, characterized in that The following steps are involved: S1. Divide the control circuit of the charge and discharge control device for circuit breaker synthesis test into a charge control module, a discharge control module, a reset module, a charge voltage monitoring module, and a contact displacement monitoring module according to the function, and lead the input and output interfaces of each module to the control panel, wherein the input and output interfaces include but are not limited to keyboards, switches, buttons, voltage meters, and display screens; S2. When the capacitor is automatically charged, the charging voltage monitoring module transmits the voltage signal to the controller to detect whether the preset charging voltage is reached. When the charging voltage reaches the preset value, charging stops. When the capacitor voltage remains unchanged after the charging switch is closed, or the capacitor voltage drops too fast after reaching the rated voltage, the controller will issue a command to actively exit the charging stage. S3. During discharge, the light-controlled delay board controls the introduction of the synthesis circuit voltage source, and controls the discharge of the charge and discharge module by setting a delay trigger signal, so that the displacement of the contact driven by the operating mechanism tracks its empirical trajectory; S4. During reset, the button is used to control the switch, connecting the positive electrode and gate electrode of the thyristor on the charge and discharge module, and the reset time of the operating mechanism is controlled by the light-controlled delay board.
5. A charge and discharge control method for circuit breaker synthesis test according to claim 4, characterized in that: The tracking includes the following steps: collecting actual contact displacement information, comparing it with the empirical trajectory, extracting the empirical discharge speed curve corresponding to the empirical trajectory, programming to output waveforms with different duty cycles through a pulse width modulation output module, controlling the opening and closing of the IGBT to achieve control of the discharge speed, and tracking the empirical discharge speed curve; the programming also includes comparing the phase, angular velocity and linear velocity of the empirical trajectory curve and the actual trajectory curve, and after iteration, combining the kinematic model and based on the control law, reducing the error between the actual trajectory and the empirical trajectory at discrete points.
6. A non-transitory readable recording medium for storing one or more programs including a plurality of instructions, characterized in that: When the instructions are executed, the processor will be caused to execute a charge and discharge control method for circuit breaker synthesis test according to any one of claims 4 to 5.
7. A charge and discharge control system for circuit breaker synthesis test, comprising a processing circuit and a memory electrically coupled thereto, characterized in that: The memory configuration stores at least one program, the program includes a plurality of instructions, and the processing circuit runs the program to execute a charge and discharge control method for circuit breaker synthesis test according to any one of claims 4-5.