Research On High Voltage Vacuum Circuit Breaker Motor Actuator And Fuzzy Control

In order to satisfy the demands of the intelligent equipments on the smart gridconstruction, and to improve the control performance and operation reliability of the highvoltage circuit breaker, the motor operating mechanism with application of modernintelligent control technology is getting more attention. This topic sets the motor operatingmechanism of a126kV high voltage vacuum circuit breaker as the research object. Thisthesis has further studied the movement characteristics of circuit breaker opening andclosing operation, the design simulation of the driving motor stator, the method of theprocess control, the driving control technology, and the practical engineering applications.In this thesis, the main research has been done as follows:(1) The thesis establishes and solves the dynamic equation of126kV high voltagevacuum circuit breaker motor mechanism, provides the basis and method for theparameters selection of the circuit breaker permanent magnet motor, calculates thecharacteristic parameters of motor driving circuit breaker during the closing and openingoperation of the operating mechanism, and analyzes the influence of the design parameterson the circuit breaker device operating speed. In order to increase the controllability of thepermanent magnet motor and to reduce the volume and moment inertia of the permanentmagnet motor, the thesis bases on the design schemes of4types of drive motor rotor,including analysis surface mounting type, dovetail groove surface mounting type, linearembedded type and outside V embedded type. It proposes the multiple slots double layersurface mounting type and design improvement of stator&rotor of permanent magnetmotor.(2) Dynamic mathematical modeling of permanent magnet motor institutions whichhave considered the characteristics of IGBT and reverse diode is studied. Through in-depthanalysis of servomotor mechanism of each link, the simulation model about servo motorcontrol system including current loop, speed loop, and position loop is proposed. And thesimulation of tracing the curve of the dynamic contact velocity characteristic is given. Theresults show that the system response time is long, and there is a big deviation in the startof the15ms when motor speed curve is traced with conventional PID control method. (3) Aiming at the characteristics of vacuum circuit breaker mechanism permanentmagnet motor servo control system, and combining the advantage of fast response speed ofthe conventional PID, a fuzzy immune PID speed tracking intelligent control method forpermanent magnet motor institutions is proposed in the thesis. The control method is basedon the principle of space vector PWM control to achieve continuous adjustability ofvoltage space vector. The simulation results show that this intelligent control method caneffectively reduce the error of the system tracking compared with the traditional PIDcontrol. The method has high robustness, and can accurately trace and momentarily controlthe dynamic performance of the permanent magnet motor.(4) Aiming at the controlled object's nonlinearity, large inertia, instant-start, heavycurrent, circuit breaker servo motor system for achieving complex control algorithm,DSP28335+FPGA+MCU multi-cpu structure has been developed. In the thesis the maincircuit designing methods of control system is presented and the prototype is developedand tested. Experiment results have shown that when these system parameters set PWM as1KHz and duty cycle as80%, these parameters of126kV breaker become closing time of40ms, opening time of30ms, the average closing speed of2.42m/s, and the averageopening speed of3.45m/s, which therefore validate the system.(5) The experiment chose mechanical properties of126kV high-voltage vacuumcircuit breaker as the test object, and established the motor drive control experiment system.Aiming at studying the different circuit breaker operation states, the experiments onclosing operation, opening operation, automatic reclosing, speed control in stages and ratetracking have been conducted respectively. Indeed, both the experimental results andcontrast analysis results of design theory show that the design requirements about the driveand control system of motor drive control system with the permanent magnet swingingangle torque can be met, and the operating status about high voltage vacuum circuitbreaker can be effectively controlled.