Research On The Intelligent Controller Of Solid Soft Starter Based On Variable Reactance Technique

In order to reduce the influence and damage to the motor itself, the load, the electric net and other equipment under the same net that brought by the direct start of 3-phase asynchronism motor, the soft start based on variable reactance technique is analyzed and the intelligeng controller of this soft start system is especially studied.In this thesis, the solid soft start system is analyzed, compared with several traditional soft start methods, the merit of the soft start based on variable reactance is expatiated. In order to satisfy the requirement of the soft starter system, the construct and blue print of the intelligent controller is discussed.In this dissertation, hardware circuit based on a microprocessor is introduced, including the system of microprocessor, the input/output channels of analog and switch signals, CAN bus communication, man-machine conversation module and the DC power, every part of the circuit is analyzed in detail. The software of the controller is discussed; include the flow of soft start and several important parts. Single neuron control algorithm is adopted to design software which is mostly fit for limiting current start mode.The model of the soft start system is set up and smulated by Matlab/Simulink, the feasibility of the controller is proved by the simulation results. At last, system debugging is illuminated and experimental results are presented.The experiments show that the intelligent controller of solid soft starter can availably control shock current of starting, and the current is lower than 3 times rating current. The operation of the controller is simple and easy, it has high degree in intelligence, and reaches the requests of the soft start of asynchronous motor.