CN201364850Y - Cylindrical linear induction motor control device of high-voltage circuit breaker - Google Patents

Abstract

The utility model relates to a control device for a cylindrical linear induction motor of a high-voltage circuit breaker. The main shaft of the cylindrical linear induction motor of the device is respectively connected with a moving contact of the high-voltage circuit breaker, a power grid fault detection unit and a control unit, and the control units are respectively connected inverter unit and grid fault detection unit. The utility model is beneficial to improving the closing and breaking capacity of the high-voltage circuit breaker, and the mechanical and electrical life and reliability of the high-voltage circuit breaker. Through the control method, the reverse operation force can be generated to replace the function of the traditional buffer device, so as to achieve the purpose of simplifying the mechanism.

Description

A Cylindrical Linear Induction Motor Control Device for High Voltage Circuit Breaker

technical field

The utility model relates to the technical field of power transmission and transformation equipment, in particular to a cylindrical linear induction motor control device for a high-voltage circuit breaker, which is used for a cylindrical linear induction motor operating mechanism and a high-voltage circuit breaker used in conjunction with high-voltage switchgear Control of the stroke characteristics of the moving contact.

Background technique

The traditional high-voltage circuit breaker operating mechanism is mainly composed of connecting rods, locks, and energy supply systems. It has many links, large cumulative motion tolerance, slow response, poor controllability, and low efficiency. The response time is generally tens of milliseconds. In addition, the action time dispersion of these operating mechanisms is also relatively large. For AC control signals, it is even greater than 10ms. Therefore, the moving characteristics of the moving contact of the high-voltage circuit breaker in the above-mentioned operating mechanism are difficult to reach an ideal level.

Contents of the invention

Aiming at the problems existing in the existing high-voltage switch operation technology, the utility model proposes an all-round control device for effectively protecting the power system by driving the high-voltage circuit breaker through a cylindrical linear induction motor when some temporary faults occur in the power grid .

The device includes a high-voltage circuit breaker and a cylindrical linear induction motor, wherein the main shaft of the cylindrical linear induction motor is connected to the moving contact of the high-voltage circuit breaker, the power grid fault detection unit and the control unit, and the control unit is connected to the inverter unit and the power grid respectively. Fault detection unit.

The inverter unit includes a three-phase power supply, an uncontrollable diode bridge rectifier module, an IPM module, a first resistor (Ron), a switch, a second resistor (R1), a voltage dividing resistor (R2), and a first capacitor (C1) , the second capacitor (C2), the third resistor (Rb), IGBT elements, diodes and Hall elements, in which the three-phase power supply is connected to the uncontrollable diode bridge rectifier module to realize the transformation of the three-phase power supply into the IPM required DC power supply, the positive pole of the DC side of the uncontrollable diode bridge rectifier module is connected to the common collector of the IPM module through the first resistor (Ron), and the negative pole of the DC side of the uncontrollable diode bridge rectifier module is connected to the common emitter of the IPM module. Wherein the first resistor (Ron) is connected in parallel with the switch, the control signal of the switch is connected to the pin set in the DSP chip initialization module, when the cylindrical linear induction motor is running, the control command is output, and the switch is closed to short-circuit the first resistor (Ron), the first branch (I) composed of the second resistor (R1) and the voltage dividing resistor (R2) in series is connected in parallel between the common collector and the common emitter of the IPM module, and the first capacitor (C1) The second branch (II) formed in series with the second capacitor (C2) and the third branch (III) composed of the third resistor (Rb) in series with the IGBT element, wherein the role of the first resistor (Ron) is to Before the operation of the cylindrical linear induction motor, make the filter first capacitor (C1) and the second capacitor (C2) have a small charging current in advance, to avoid the impact caused by the instantaneous high current charging of the capacitor, and to protect the rectifier module and filter capacitor. The leading end of the voltage dividing resistor (R2) in the first branch (I) is connected with the input end of the overvoltage detection circuit in the control unit; Control the discharge driving circuit in the third branch (III) to drive the IGBT to turn on, and consume the electric energy on the third resistor (Rb). In the second branch (II), the anode of the first capacitor (C1) and the IPM module The common collector of the IPM module is connected to the common emitter of the IPM module and the anode of the second capacitor (C2); in the third branch (III), the emitter and the collector of the IGBT component are connected in parallel with the diode, and the IGBT component The base of the IPM is connected to the output terminal of the discharge drive circuit in the control unit; the input terminal of the IPM module is connected to the output terminal of the IPM isolation drive circuit in the control unit, and the three-phase terminal output by the IPM module passes through the Hall element and the control unit. The input terminals of the level conversion circuit are connected.

The control unit includes an overvoltage detection circuit, a DSP chip, a discharge drive circuit, an IPM isolation drive circuit, a level conversion circuit, a rotary encoder, an emulator and a host PC, and the output terminal of the overvoltage detection circuit is connected to the DSP chip protection module. The pins set in the over-voltage protection function are connected, the input end of the discharge drive circuit is connected to the pin set by the DSP chip protection module, and the input end of the isolated drive circuit of the IPM is connected to PWM1~PWM6 on the DSP chip. The output pins of the level conversion circuit are connected to the analog input port on the DSP chip. The level conversion circuit converts the signal output by the Hall element into the signal accepted by the DSP, and the code disc shaft of the rotary encoder Through the connection of the small pulley with the cylindrical linear induction motor, the rotary encoder can detect the speed and position of the motor in the utility model, and the A and B phase output terminals of the rotary encoder are connected with the QEP1 and QEP2 ports on the DSP chip. The calculation is carried out through the DSP speed measurement module, and the DSP chip is connected with the upper PC through an emulator.

The grid fault detection unit includes a grid fault detection circuit, and the grid fault detection circuit is connected to the pins set by the grid fault detection module of the DSP chip in the control unit.

The utility model is beneficial to improving the closing and breaking capacity of the circuit breaker, as well as the mechanical and electrical service life and reliability of the circuit breaker through the control of the cylindrical linear induction motor. In addition, the purpose of simplifying the mechanism can be achieved by controlling the effect of the buffer device that can make the mechanism generate a reverse operating force to replace the buffer device of the traditional operating mechanism.

Description of drawings

Fig. 1 is a schematic diagram of mechanism model connection in the utility model;

Fig. 2 is the structural diagram of the control system of the cylindrical linear induction motor of the present invention;

Fig. 3 is a flow chart of the application method control program of the cylindrical linear induction motor control device of the utility model high-voltage circuit breaker;

Fig. 4 is a flow chart of the application method step 1 of the control program of the cylindrical linear induction motor control device of the high voltage circuit breaker;

Fig. 5 is a control program flow chart of the third step of the application method of the cylindrical linear induction motor control device of the high-voltage circuit breaker;

Fig. 6 (a) is the utility model rotary encoder;

Fig. 6 (b) is the output mode of the utility model rotary encoder;

Fig. 7 is the hardware connection diagram of the utility model RS-232 and TMS320F2812;

Fig. 8 (a) is the speed curve of the moving contact when the utility model is closed

Fig. 8 (b) is the speed curve of the moving contact when the utility model is opened;

Fig. 9 is a schematic diagram of the level conversion circuit of the present invention;

Fig. 10 is a schematic diagram of the grid fault detection circuit of the utility model;

Fig. 11 is a schematic diagram of the utility model overvoltage detection circuit;

Fig. 12 is a schematic diagram of the utility model discharge driving circuit;

In Figure 1: 1 inverter unit, 2 control unit, 3 grid fault detection unit, 4 cylindrical linear induction motor, 5 high voltage circuit breaker;

In Figure 2: 6 three-phase power supply, 7 uncontrollable diode bridge rectifier module, 8IPM module, 29 Hall element, 9 overvoltage detection circuit, 10 discharge drive circuit, 11IPM isolation drive circuit, 12DSP chip, 13 electric circuit Flat conversion circuit, 14 rotary encoder, 15 power grid fault detection circuit, 16 emulator, 17 upper PC;

Among Fig. 7: 18 light sources, 19 concentrated light sources, 20 photoelectric discs, 21 light baffle plates, 22 photocells, 23 shaping and enlarging, 24 numerical display devices, 25 small pulleys, 26 lattice layers, 27 gaps, 28 code disc rotating shafts.

Detailed ways

The DSP chip model of the utility model is TMS320F2812, the IPM isolation drive circuit adopts a high-speed model HCPL-4504 photoelectric coupler dedicated to the IPM interface, the discharge drive circuit model is PM300DSA120, the Hall element model is LT10-C, and the rotary encoder adopts OMRON’s incremental The model of the quantitative rotary encoder is E6B2-CWZ6C, and the DSP communicates with the upper PC through the driver chip SP3223EEY that conforms to the RS-232 standard.

As shown in Figure 1, the device includes a high-voltage circuit breaker 5, a cylindrical linear induction motor 4, and the main shaft of the cylindrical linear induction motor 4 is connected to the moving contact of the high-voltage circuit breaker 5, the grid fault detection unit 3 and the control unit 2 respectively. , the control unit 2 is connected to the inverter unit 1 and the grid fault detection unit 3 respectively.

As shown in Figure 2, the inverter unit 1 includes a three-phase power supply 6, an uncontrollable diode bridge rectifier module 7, an IPM module 8, a first resistor (Ron), a switch, a second resistor (R1), a voltage dividing resistor ( R2), the first capacitor (C1), the second capacitor (C2), the third resistor (Rb), IGBT element, diode and Hall element 29, wherein the three-phase power supply 6 and the uncontrollable diode bridge rectifier module 7 Connected, the positive pole of the DC side of the uncontrollable diode bridge rectifier module 7 is connected to the common collector of the IPM module 8 through the first resistor (Ron), and the negative pole of the DC side of the uncontrollable diode bridge rectifier module 7 is connected to the common collector of the IPM module 8. Emitter, wherein the first resistor (Ron) is connected in parallel with the switch, the control signal of the switch is connected to the pin provided in the DSP chip 12 initialization module, and is connected in parallel between the common collector and the common emitter of the IPM module 8 by The first branch (I) composed of the second resistor (R1) and the voltage dividing resistor (R2) in series, the second branch (II) composed of the first capacitor (C1) and the second capacitor (C2) in series, and the The third branch (III) formed by the third resistor (Rb) and the IGBT element in series, the lead-out end of the voltage dividing resistor (R2) in the first branch (I) and the overvoltage detection circuit 9 in the control unit 2 The input end is connected; In the second branch (II), the anode of the first capacitor (C1) is connected with the common collector of the IPM module 8, and the common emitter of the IPM module 8 is connected with the anode of the second capacitor (C2); In the third branch (III), the diode is connected in parallel between the emitter and the collector of the IGBT element, and the base of the IGBT element is connected to the output end of the discharge drive circuit 10 in the control unit 2; the input end of the IPM module 8 The output terminal of the isolated drive circuit 11 of the IPM in the control unit 2 is connected, and the three-phase output terminal of the IPM module 8 is connected to the input terminal of the level conversion circuit 13 in the control unit 2 through the Hall element 29 .

As shown in Figure 2, the control unit 2 includes an overvoltage detection circuit 9, a DSP chip 12, a discharge drive circuit 10, an isolation drive circuit 11 for IPM, a level conversion circuit 13, a rotary encoder 14, an emulator 16 and a host PC 17 , wherein the output end of the overvoltage detection circuit 9 is connected to the set pin of the overvoltage protection function in the DSP chip 12 protection module, and the input end of the discharge drive circuit 10 is connected to the set pin of the DSP chip 12 protection module , the input end of the isolation driving circuit 11 of IPM is connected with six output pins of PWM1～PWM6 on the DSP chip 12, the output end of the level conversion circuit 13 is connected with the analog input port on the DSP chip 12, and the rotary encoder 14 is as The code disc rotating shaft 28 shown in Figure 7 is connected with the cylindrical linear induction motor 4 through the small pulley 25, and the A and B phase output ends of the rotary encoder 14 are connected with the QEP1 and QEP2 ports on the DSP chip 12, and the DSP chip 12 passes through The emulator 16 is connected with a host PC 17 .

Grid fault detection unit 3 comprises grid fault detection circuit 15 as shown in Fig. 2, Fig. 8 (a) and Fig. 8 (b), and grid fault detection circuit 15 and DSP chip 12 grid fault detection modules in control unit 2 are set The pins are connected.

The application method of the high-voltage circuit breaker cylindrical linear induction motor control device is shown in Figure 3, and the steps are as follows:

Step 1. The grid fault detection unit feeds back the measured grid voltage and current signals to the control unit, and the control unit obtains the speed curve;

Step 2. The control unit controls the inverter unit, and then the inverter unit drives the cylindrical linear induction motor to move;

Step 3: The moving contact of the high-voltage circuit breaker is controlled by the movement of the main shaft of the cylindrical linear induction motor to perform opening/closing movement according to the speed curve.

In the first step, the grid fault detection unit feeds back the measured grid voltage and current signals to the control unit, and the control unit obtains the control method of the speed curve according to the following steps:

Step 1. The control system starts to run, download the program to the DSP chip through the upper PC, and the CPU of the DSP chip calls the SCI communication module to set the communication protocol; The device is initialized;

Step 2. The CPU of the DSP chip detects whether there is an interruption in the power grid fault detection module. When the power grid fault detection circuit detects a power grid fault, apply for an interruption and enter step 3. When there is no fault interruption, return to step 2.

Step 3. The CPU checks whether there is an overvoltage signal. If yes, go to step 7. If not, go to step 4.

Step 4. The DSP chip judges the fault type according to the detection signal, and then determines the corresponding speed curve by querying the fault type and speed curve table, as shown in Figure 8(a) and Figure 8(b), and uses it as a given speed, If a three-phase short-circuit fault occurs in the power grid at this time, the CPU calculates the speed given curve of the three-phase short-circuit fault type;

Step 5. The DSP chip calculates the corresponding speed curve by querying the fault type and speed curve table, as shown in Figure 8(a) and Figure 8(b), compares it with the motor speed detection signal, and the DSP chip calls the speed measurement module to calculate The speed regulator is given, and then the PI adjustment module, the vector transformation module, the current sampling module, the flux linkage angle calculation module, and the voltage space vector module are sequentially called through the DSP chip to perform control algorithm operations. Pins PWM1~PWM6 send the generated SVPWM control signal to the IPM module;

Step 6. Invert the IPM module to form the primary iron core voltage signal required by the cylindrical linear induction motor, thereby driving the cylindrical linear induction motor to move, and then drive the movable contact of the high-voltage circuit breaker by the cylindrical linear induction motor, so that The moving contact moves according to the speed curve;

Step 7. The DC side of the inverter circuit is connected to the overvoltage protection circuit through a voltage dividing resistor (R2). When the pump overvoltage occurs on the DC side, the overvoltage protection circuit sends a high-level signal to the DSP chip, so that the DSP chip protects the module. Apply for an interrupt, and then the DSP chip generates a SVPWM modulation signal and sends it to the discharge drive circuit.

The main functions of the modules referenced in the above steps are:

The initialization module is used to set the system clock, set the format of the serial port, and allow the serial port to receive interrupts, initialize various I/O interfaces, initialize each timer, set to full comparison mode, and set the dead zone Time, A/D sampling initialization, select sampling channel, clear the analog input port, and initialize and assign values to the storage units corresponding to each variable; the SCI communication module is used to send characters according to the PC, and the DSP chip receives data, When the received identifier is "1", set the speed given value; when the received identifier is "2", set the d-axis current PI parameter; when the received identifier is "3", set the q-axis current PI parameters, when the received identifier is "4", set the PI parameters for speed adjustment, when the received identifier is "5", receive the system running flag, and start the system when the bit is "1" Operation; the current sampling module is used to process the signal input to the A/D port of the DSP chip through the level conversion circuit; the circuit protection module is used to judge whether the overvoltage is received according to the overvoltage detection signal , if there is overvoltage, a control signal is given to the discharge drive circuit to protect the circuit; the speed measurement module is used to enter the servo interruption, read the motor speed signal, and compare it with the given ideal signal , given the input of the speed regulator; the PI adjustment module is used to complete the functions of the speed regulator and the current regulator; the vector transformation module is used for coordinate transformation and provides an algorithm; the flux linkage angle The calculation module is used to complete the calculation of the indirect flux linkage angle, and the control quantity is calculated in combination with the vector transformation; the voltage space vector module is used to determine the SVPMWM duty cycle according to the combination control quantity; the power grid fault detection module is used The fault type is judged based on the grid fault signal detected by the grid detection circuit. Since each fault type corresponds to a speed curve, it must correspond to the fault type and speed curve table programmed in advance, and then give the corresponding speed curve.

Claims (4)

1, a kind of primary cut-out cylindrical linear induction motor control device, comprise primary cut-out, cylindrical linear induction motor, it is characterized in that: the main shaft of cylindrical linear induction motor is connected with control unit with moving contact in high voltage breaker, electric network fault detecting unit respectively, and control unit connects inversion unit and electric network fault detecting unit respectively.

2, primary cut-out cylindrical linear induction motor control device according to claim 1, it is characterized in that described inversion unit comprises three phase mains, uncontrollable diode bridge rectifier module, the IPM module, first resistance (Ron), switch, second resistance (R1), divider resistance (R2), first electric capacity (C1), second electric capacity (C2), the 3rd resistance (Rb), the IGBT element, diode and Hall element, wherein three phase mains links to each other with uncontrollable diode bridge rectifier module, uncontrollable diode bridge rectifier module DC side positive pole connects the common collector of IPM module through first resistance (Ron), uncontrollable diode bridge rectifier module DC side negative pole connects the common emitter of IPM module, wherein first resistance (Ron) and switch in parallel, the control signal of switch terminates on the pin set in the dsp chip initialization module, first branch road (I) that is composed in series by second resistance (R1) and divider resistance (R2) in parallel between the common collector of IPM module and common emitter, second branch road (II) that is composed in series by first electric capacity (C1) and second electric capacity (C2) and the 3rd branch road of forming by the 3rd resistance (Rb) and IGBT element connected in series (III), the input of the over-voltage detection circuit in first branch road (I) in the exit of divider resistance (R2) and the control unit links to each other; The anode of first electric capacity (C1) links to each other with the common collector of IPM module in second branch road (II), and the common emitter of IPM module links to each other with the anode of second electric capacity (C2); In the 3rd branch road (III), be in parallel with diode between the emitter and collector of IGBT element, the base stage of IGBT element connects the output of the discharge drive circuit in the control unit; The input of IPM module connects the output of the isolated drive circuit of the IPM in the control unit, and the three phase terminals process Hall element of IPM module output links to each other with the level shifting circuit input in the control unit.

3; primary cut-out cylindrical linear induction motor control device according to claim 1; it is characterized in that described control unit comprises over-voltage detection circuit; dsp chip; the discharge drive circuit; the isolated drive circuit of IPM; level shifting circuit; rotary encoder; simulator and upper PC; wherein the output of over-voltage detection circuit links to each other with the pin that sets about over-voltage protection function in the dsp chip protection module; the input of discharge drive circuit connects the pin that the dsp chip protection module sets; the input of the isolated drive circuit of IPM links to each other with six output pins of PWM1～PWM6 on the dsp chip; the output of level shifting circuit links to each other with analog input port on the dsp chip; the code-disc rotating shaft of rotary encoder is connected with cylindrical linear induction motor by truckle; the A of rotary encoder; QEP1 on B phase output terminal and the dsp chip; the QEP2 port links to each other, and dsp chip links to each other with upper PC by simulator.

4, primary cut-out cylindrical linear induction motor control device according to claim 1, it is characterized in that described electric network fault detecting unit comprises the electric network fault testing circuit, the electric network fault testing circuit links to each other with the pin that dsp chip electric network fault detection module in the control unit sets.

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