A slip control system and control method for a high-power pulse generator set

Abstract

The present invention belongs to the technical field of motor system control, and specifically relates to a slip control system of a high-power pulse generator set and a control method thereof. The slip control system comprises: a 2500kw motor, a slip device, a main monitoring PC, a PLC master station and a slip control cabinet and a plurality of slip control devices arranged in the slip control cabinet. The present invention realizes high-parameter and high-precision slip starting mode control, can meet the technical requirements of frequent starting of a high-power pulse generator set and interlocking control of multiple slip control devices, can meet the safety of the unit starting and stably accelerate according to a given current.

Description

Technical Field

[0001] The invention belongs to the technical field of motor system control, and in particular relates to a slip control system and a control method of a high-power pulse generator set. Background Art

[0002] The traditional motor rotor series resistance starting control method is used in low-power applications. It maintains a constant torque starting of the rotor circuit series resistance by changing the slip resistance to maintain a constant stator current. The control parameters and accuracy requirements are low. The traditional control system only supports starting from a stop state to the maximum speed, and the maximum speed that can be achieved by accelerating the motor using the traditional slip control system is low, which cannot meet the discharge requirements of the device experiment. In addition, the existing slip control method has large fluctuations in the stator current during the acceleration process, and cannot stably accelerate the unit according to the given current.

[0003] In the Tokamak device, a high-power pulse generator set is required for power supply. The pulse generator set consists of three parts: an electric motor, a flywheel, and a generator. The motor power of the high-power horizontal pulse generator set is as high as 2500kW, the motor starting torque is large, and the starting time is long. According to the experimental requirements of the 2M device, the unit needs to start quickly to 1500rpm within 20 minutes, and discharge and re-accelerate every 15 minutes during the experiment. The high-power pulse generator set uses a liquid slip regulator (abbreviated as "slip") to control the unit. The slip device is equipped with three travel switches: high position, pre-position, and low position, including three operating modes: quick lift, high position, and acceleration. During the experiment, the slip device needs to frequently move between the pre-position and the low position to realize the discharge and re-acceleration process of the unit; and the resistance liquid spacing between the low-position plates of the slip device is only 2mm. How to ensure that the stator overcurrent does not occur while also ensuring the extremely high requirements of the generator set for parameters such as acceleration time, current fluctuation, and torque stability is a problem that urgently needs to be solved. Therefore, it is necessary to design a slip control system and control method that can control high parameters and high precision in a high-power pulse generator set to solve the above-mentioned prior art problems. Summary of the invention

[0004] The present invention proposes a slip control system and a control method for a high-power pulse generator set, which are used to solve the technical problems that the slip control device in the prior art only supports state switching from a stop state to a maximum speed, and the maximum speed of the acceleration motor of the existing slip control device is low and cannot meet the experimental discharge requirements. In addition, the control method of the existing slip control device has large fluctuations in the stator current during the acceleration process and cannot stably accelerate the unit according to a given current.

[0005] The technical solution of the present invention is:

[0006] A slip control system for a high-power pulse generator set includes: a 2500kw motor, a slip device, a main monitoring PC, a PLC master station, a slip control cabinet, and several sets of slip control devices arranged in the slip control cabinet; the 2500kw motor is connected to the slip device and the slip control cabinet respectively, and each set of slip control devices includes: a slip DC speed regulator, a PID regulator, a slip PLC substation, a communication control module and a current measuring device.

[0007] The slip DC speed regulator in the slip control device is connected to the slip PLC substation, the PID regulator is connected to the DC motor in the slip control device, the communication control module is arranged in the slip PLC substation, and the current measuring device is connected to the PID regulator.

[0008] The main monitoring PC is connected to the PLC master station, and the PLC master station is also connected to the slip control cabinet.

[0009] The slip PLC substations in each slip control device are connected to the PLC master station through the slip control cabinet.

[0010] The slip device contains a liquid resistor.

[0011] The 2500KW motor is started by means of a liquid resistor in a rotor series slip device.

[0012] The control logic of the slip PLC substation in each slip control device includes: slip control system raising position operation mode, slip control system fast raising operation mode and slip control system accelerating operation mode;

[0013] When the slip control system operates in the fast-lift mode, the DC speed regulator in the slip control device is set to a voltage of 220V, and the slip device is quickly raised to the pre-position one in about 10s;

[0014] When the slip control system operates in the high position operation mode, the DC speed regulator in the slip control device is set to a voltage of 220V, and the slip device is raised to the high position;

[0015] When the slip control system runs in acceleration mode, the DC speed regulator in the slip control device has a given voltage of 180V. The slip control system adjusts the PID regulator by introducing the stator current of the unit as a feedback signal, and the slip device is moved from a high position or pre-position to a low position.

[0016] The number of the plurality of slip control devices is three, and the names of the three slip control devices are respectively slip control device number one, slip control device number two, and slip control device number three.

[0017] The communication between the slip PLC substation and the PLC master station adopts the PROFIBUS DP communication protocol; the communication between the main monitoring PC and the PLC master station adopts the MPI communication protocol.

[0018] The master station PLC controls the three slip control devices to accelerate in sequence according to a preset acceleration sequence. The preset acceleration sequence of the three slip control devices is slip control device number three, slip control device number one and slip control device number two, thereby ensuring that only one slip control device is accelerated at the same time, avoiding multiple slip control devices from working at the same time.

[0019] Each slip control device has two control modes: local control and computer control. The computer control mode is to control the PLC master station through the main monitoring PC, and control the slip PLC substation connected to the PLC master station;

[0020] The local control mode directly controls the slip PLC substation through the slip control cabinet;

[0021] Of the two control modes mentioned above, local control and computer control, computer control has priority.

[0022] When the slip control system is running in acceleration mode, a time delay is set in the start-up phase.

[0023] The stator current stop value and the stator current start value are set for the PID regulator; when the stator current exceeds the stator current stop value, the DC speed regulator stops; when the stator current decreases to the stator current start value, the DC speed regulator restarts.

[0024] A control method for the slip control system of the high-power pulse generator set as described above comprises the following control steps:

[0025] Step 1: When the PLC substation in the slip control device meets the start-up conditions of the slip control system and the PLC substation receives the computer control command of the main monitoring PC or the local control command, the unit starts, the slip control device starts after a delay, and the DC speed regulator starts to work and executes the acceleration operation mode of the slip control system;

[0026] Step 2: The PID regulator receives the stator current signal of the 2500KW motor and controls the electrode descent speed. After the electrode reaches the low position, the electrode startup is completed.

[0027] Step 3: If the unit is discharged during step 2, the slip control system starts the fast-lift operation mode, the DC speed regulator set voltage is 220V, and the slip device quickly rises to the pre-position 1 in about 10s. After the discharge is completed, the slip control system is restarted to accelerate the operation mode, and the PID regulator feedback control works. When the electrode reaches the low position, the acceleration is completed;

[0028] When the unit is shut down during step 2, the slip control system executes the high-position operation mode, the DC speed regulator set voltage is 220V, and the slip device is raised to the high position.

[0029] Beneficial effects of the present invention:

[0030] The slip control system and control method designed in the present invention realize high-parameter and high-precision slip starting mode control, can meet the technical requirements of frequent starting of large-power pulse generator sets and interlocking control of multiple slip control devices, can meet the unit starting safety and stable acceleration according to a given current.

[0031] In addition, the slip control device designed in the present invention has the following specific technical advantages:

[0032] 1) The slip control system designed in the present invention takes into account that when multiple slip control devices work at the same time, the multiple slip control devices are operated by a linkage control method. Through the linkage control between different slip control devices, the multiple slip control systems are accelerated in sequence, avoiding simultaneous acceleration. It is ensured that only one slip device is accelerated at the same time, thereby improving reliability and operating parameters.

[0033] 2) The slip control device in the slip control system designed by the present invention adopts three control operation modes, namely, quick lifting, high position and acceleration operation modes.

[0034] 3) The control strategy of the slip control device is optimized, and a time delay is added to the startup phase of the acceleration operation mode of the slip control device to prevent overcurrent of the stator current of the generator set system during startup.

[0035] The present invention can effectively improve the stability of the unit startup, avoid the impact of unstable startup on the unit structure, increase the unit startup current, effectively shorten the unit startup time, and take into account the requirements of shortening the startup time and starting stability. The unit stator current overcurrent phenomenon will not occur, and the unit protection tripping during the startup process is avoided. The device can meet the high-parameter pulse discharge requirements of the 2M Tokamak device and can shorten the discharge time interval from 20 minutes to 15 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the slip control system of the present invention;

[0037] Figure 2 A schematic diagram of a configuration network connection of multiple slip control devices in the slip control system of the present invention;

[0038] Figure 3It is a control flow chart of the slip PLC substation in the slip control device of the present invention;

[0039] Figure 4 A flow chart of the PID regulator adjustment process in the slip control device designed for the present invention;

[0040] Figure 5 It is a waveform diagram of the generator set speed increase, the set stator current, the set rotor current and the set rotor voltage; DETAILED DESCRIPTION

[0041] The following is a detailed description of a slip control system and a control method for a high-power pulse generator set of the present invention in conjunction with the accompanying drawings and embodiments.

[0042] A slip control system for a high-power pulse generator set includes: a 2500kw motor, a slip device, a main monitoring PC, a PLC master station, a slip control cabinet, and several sets of slip control devices arranged in the slip control cabinet; the 2500kw motor is connected to the slip device and the slip control cabinet respectively, and each set of slip control devices includes: a slip DC speed regulator, a PID regulator, a slip PLC substation, a communication control module and a current measuring device.

[0043] The slip DC speed regulator in the slip control device is connected to the slip PLC substation, the PID regulator is connected to the DC motor in the slip control device, the communication control module is arranged in the slip PLC substation, and the current measuring device is connected to the PID regulator.

[0044] The main monitoring PC is connected to the PLC master station, and the PLC master station is also connected to the slip control cabinet.

[0045] The slip PLC substations in each slip control device are connected to the PLC master station through the slip control cabinet.

[0046] The slip device contains a liquid resistor.

[0047] The slip control cabinet also includes: lifting and lowering contactors, control line relays, current transformers, current transmitters and digital input and output modules. The connection relationship between the lifting and lowering contactors, control line relays, current transformers, current transmitters and digital input and output modules in the slip control cabinet is the same as the connection relationship in the original slip control.

[0048] The 2500KW motor is started by means of a liquid resistor in a rotor series slip device.

[0049] The control logic of the slip PLC substation in each slip control device includes: slip control system raising position operation mode, slip control system fast raising operation mode and slip control system accelerating operation mode;

[0050] When the slip control system operates in the fast-lift mode, the DC speed regulator in the slip control device is set to a voltage of 220V, and the slip device is quickly raised to the pre-position one in about 10s;

[0051] When the slip control system operates in the high position operation mode, the DC speed regulator in the slip control device is set to a voltage of 220V, and the slip device is raised to the high position;

[0052] When the slip control system runs in acceleration mode, the DC speed regulator in the slip control device has a given voltage of 180V. The slip control system adjusts the PID regulator by introducing the stator current of the unit as a feedback signal, and the slip device is moved from a high position or pre-position to a low position.

[0053] The number of the plurality of slip control devices is three, and the names of the three slip control devices are respectively slip control device number one, slip control device number two, and slip control device number three.

[0054] The communication between the slip PLC substation and the PLC master station adopts the PROFIBUS DP communication protocol; the communication between the main monitoring PC and the PLC master station adopts the MPI communication protocol.

[0055] The master station PLC controls the three slip control devices to accelerate in sequence according to a preset acceleration sequence. The preset acceleration sequence of the three slip control devices is slip control device number three, slip control device number one and slip control device number two, thereby ensuring that only one slip control device is accelerated at the same time, avoiding multiple slip control devices from working at the same time.

[0056] Each slip control device has two control modes: local control and computer control. The computer control mode is to control the PLC master station through the main monitoring PC, and control the slip PLC substation connected to the PLC master station;

[0057] The local control mode directly controls the slip PLC substation through the slip control cabinet;

[0058] Of the two control modes mentioned above, local control and computer control, computer control has priority.

[0059] When the slip control system is running in acceleration mode, a time delay is set in the start-up phase.

[0060] The stator current stop value and the stator current start value are set for the PID regulator; when the stator current exceeds the stator current stop value, the DC speed regulator stops; when the stator current decreases to the stator current start value, the DC speed regulator restarts.

[0061] like Figure 3 As shown; A control method for a slip control system of a high-power pulse generator set as described above comprises the following control steps:

[0062] Step 1: When the PLC substation in the slip control device meets the start-up conditions of the slip control system and the PLC substation receives the computer control command of the main monitoring PC or the local control command, the unit starts, the slip control device starts after a delay, and the DC speed regulator starts to work and executes the acceleration operation mode of the slip control system;

[0063] Step 2: The PID regulator receives the stator current signal of the 2500KW motor and controls the electrode descent speed. After the electrode reaches the low position, the electrode startup is completed.

[0064] Step 3: If the unit is discharged during step 2, the slip control system starts the fast-lift operation mode, the DC speed regulator set voltage is 220V, and the slip device quickly rises to the pre-position 1 in about 10s. After the discharge is completed, the slip control system is restarted to accelerate the operation mode, and the PID regulator feedback control works. When the electrode reaches the low position, the acceleration is completed;

[0065] When the unit is shut down during step 2, the slip control system executes the high-position operation mode, the DC speed regulator set voltage is 220V, and the slip device is raised to the high position.

[0066] The slip control device sets two speed parameters to drive the electrode action, and controls the selection switch to switch the speed mode through the control line relay, the lifting operation mode of the slip control device, and the descending operation mode of the slip control device.

[0067] The specific embodiment operation method includes:

[0068] When the slip control device is in descending operation mode, a 20s time delay is added to the start-up phase to prevent stator current overcurrent. The slip device will perform the descending operation after the delay time is up. At the beginning of the descent phase, the DC speed regulator given voltage rises from 0V to 220V within 2s according to the given slope. Set the stator current stop setting value and start setting value of the PID regulator. The stator current is inversely proportional to the DC speed regulator given voltage. When the current is 0, the electrode descends at full speed according to the DC speed regulator given voltage setting parameter of 180V. When the current reaches the stop setting value of 248A, the DC speed regulator given voltage is 0V, and the electrode stops descending. When the current drops to the stop start value of 248A, the DC speed regulator given voltage is greater than 0V, and the electrode descends again. There is a difference of 2A between the stator current stop setting value and the start setting value to avoid frequent starting and stopping of the DC motor.

[0069] Figure 4It is a functional diagram of the PID regulator. The traditional slip speed regulation only controls the start and stop of the electrode by introducing a switch node signal, and the speed is adjusted by frequent actions of the electrode operating mechanism or the speed regulating motor.

[0070] The PID regulation introduced in the device of the present invention measures the motor stator current through a 400 / 5 current transformer, and then converts it using a 5A / 10V circuit sensor, introduces the obtained voltage signal into a PID controller, compares the motor stator measurement value with the motor stator given value to obtain a deviation value, and then performs PID processing on the deviation value, and the DC speed regulator output drives the DC motor to control the descending speed of the slip electrode, thereby changing the resistance value of the liquid resistor to adjust the stator current.

[0071] The slip resistance changes with the displacement of the slip electrode, and the descent process of the slip electrode is a closed-loop control process. The stator current of the motor outputs a secondary current through the current transformer, and the current sensor converts the secondary current into a DC voltage output proportional to it. After comparing the stator current setting signal with the DC signal output by the current sensor, the signal integrated and amplified by the PID feedback control unit controls the output of the DC speed control power supply, which controls the speed of the electrode descending motor to make the liquid resistance change with the stator current.

[0072] like Figure 5 As shown, Figure 5 In the middle, waveform 1 is the unit speed rising waveform, waveform 2 is the unit stator current, waveform 3 is the unit rotor current, and waveform 4 is the unit rotor voltage.

[0073] Figure 5 The unit started quickly to 1500rpm within 18 minutes. The stator current was stable and close to the maximum value of 248A during the entire startup process, reflecting that the unit started smoothly and quickly. The rotor voltage dropped at a certain slope and the rotor current was stable, reflecting that the resistance of the slip device dropped steadily and the speed control system was stable.

[0074] The slip control cabinet can also be remotely monitored and controlled through the main monitoring PC during the operation of the unit. The PROFIBUS DP communication protocol is used to replace a large amount of long-distance wiring and calibration work; fieldbus communication greatly simplifies system maintenance, reduces failure points, and increases system reliability.

[0075] The signal calls between the various slip systems are realized through the program, which is convenient for reading and writing programs and improves the readability of the programs; at the same time, the execution status of the variables and statements in the program can be monitored online in real time, and the status of each parameter and each device can be directly displayed dynamically. The main monitoring PC not only realizes the working status monitoring of the slip system, but also has the functions of alarm display and data archiving.

[0076] In the device of the present invention, multiple slip control devices are interlocked through the master station PLC, and the three units are accelerated in the order of serial number 3-1-2 to avoid multiple slip systems working at the same time. After the slip control device receives the acceleration command, the system starts to accelerate when the slip control device receives the signal that the pole plate position is in the pre-position one, the central control command release signal, the return command condition signal, and the other slip control devices have not accelerated. When the slip control device receives the low-position signal, it stops accelerating. When the speed reaches 1500rpm, the slip control device sends an acceleration completion signal. When the previous slip control device sends an acceleration completion signal, the other slip control devices meet their own acceleration conditions, and the slip control device starts the acceleration process. It effectively solves the interlocking problem of multiple slip control systems, and the unit acceleration process is smooth and without fluctuations. It can quickly start to the maximum speed to protect the operation safety of the unit.

[0077] In addition, the slip control system designed in the present invention introduces a time delay function in the acceleration mode starting phase to prevent the stator current of the unit system from overcurrent during startup. The slip device performs the descending operation after the delay time is up, and slope control is added in the descending starting phase. The given voltage of the DC speed regulator increases according to the slope, and there will be an acceleration process in the descending process.

[0078] The embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the field without departing from the purpose of the present invention.

Claims

1. A slip control system for a high-power pulse generator set, characterized in that: include: 2500kW motor, slip device, main monitoring PC, PLC master station and slip control cabinet and several sets of slip control devices installed in the slip control cabinet; The 2500kW motor is connected to the slip device and the slip control cabinet respectively. Each slip control device includes: slip DC speed regulator, PID regulator, slip PLC substation, communication control module and current measurement device. The slip DC speed regulator in the slip control device is connected to the slip PLC substation, the PID regulator is connected to the DC motor in the slip control device, the communication control module is arranged in the slip PLC substation, and the current measuring device is connected to the PID regulator; The main monitoring PC is connected to the PLC master station, and the PLC master station is also connected to the slip control cabinet; The control logic of the slip PLC substation in each slip control device includes: slip control system raising position operation mode, slip control system fast raising operation mode and slip control system accelerating operation mode; When the slip control system operates in the fast lifting mode, the DC speed regulator in the slip control device is set to a voltage of 220V, and the slip device is quickly raised to the pre-position one in about 10s; When the slip control system operates in the high position operation mode, the DC speed regulator in the slip control device is set to a voltage of 220V, and the slip device is raised to the high position; When the slip control system runs in acceleration mode, the DC speed regulator in the slip control device has a given voltage of 180V. The slip control system adjusts the PID regulator by introducing the stator current of the unit as a feedback signal, and the slip device is moved from a high position or pre-position to a low position.

2. A slip control system for a high-power pulse generator set according to claim 1, characterized in that: The slip PLC substations in each slip control device are connected to the PLC master station through the slip control cabinet.

3. A slip control system for a high-power pulse generator set according to claim 2, characterized in that: The slip device contains a liquid resistor.

4. A slip control system for a high-power pulse generator set according to claim 3, characterized in that: The 2500kW motor is started by means of a liquid resistor in a rotor series slip device.

5. A slip control system for a high-power pulse generator set according to claim 4, characterized in that: The number of the plurality of slip control devices is three, and the names of the three slip control devices are respectively slip control device number one, slip control device number two, and slip control device number three.

6. A slip control system for a high-power pulse generator set according to claim 5, characterized in that: The communication between the slip PLC substation and the PLC master station adopts the PROFIBUS DP communication protocol; the communication between the main monitoring PC and the PLC master station adopts the MPI communication protocol.

7. A slip control system for a high-power pulse generator set according to claim 6, characterized in that: The master station PLC controls the three slip control devices to accelerate in sequence according to a preset acceleration sequence. The preset acceleration sequence of the three slip control devices is slip control device number three, slip control device number one and slip control device number two, thereby ensuring that only one slip control device is accelerated at the same time, avoiding multiple slip control devices from working at the same time.

8. A slip control system for a high-power pulse generator set according to claim 7, characterized in that: Each slip control device has two control modes: local control and computer control. The computer control mode is to control the PLC master station through the main monitoring PC, and control the slip PLC substation connected to the PLC master station; The local control mode directly controls the slip PLC substation through the slip control cabinet; Of the two control modes mentioned above, local control and computer control, computer control has priority.

9. A slip control system for a high-power pulse generator set according to claim 8, characterized in that: When the slip control system is running in acceleration mode, a time delay is set in the start-up phase.

10. A slip control system for a high-power pulse generator set according to claim 9, characterized in that: The PID regulator is numerically set to a stator current stop value and a stator current start value; when the stator current exceeds the stator current stop value, the DC speed regulator stops; When the stator current drops to the stator current starting value, the DC speed regulator restarts.

11. A control method for a slip control system of a high-power pulse generator set according to any one of claims 1 to 10, characterized in that The control steps include: Step 1: When the PLC substation in the slip control device meets the start-up conditions of the slip control system and the PLC substation receives the computer control command of the main monitoring PC or the local control command, the unit starts, the slip control device starts after a delay, and the DC speed regulator starts to work and executes the acceleration operation mode of the slip control system; Step 2: The PID regulator receives the stator current signal of the 2500kW motor and controls the electrode descending speed. After the electrode reaches the low position, the electrode startup is completed; Step 3: If the unit is discharged during step 2, the slip control system starts the fast-lift operation mode, the DC speed regulator set voltage is 220V, and the slip device quickly rises to the pre-position 1 in about 10s. After the discharge is completed, the slip control system is restarted to accelerate the operation mode, and the PID regulator feedback control works. When the electrode reaches the low position, the acceleration is completed; When the unit is shut down during step 2, the slip control system executes the high-position operation mode, the DC speed regulator set voltage is 220V, and the slip device is raised to the high position.

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