Simulation of Soft Start-Up of Asynchronous Machines with Pump-Control Function Based on Thyristor

To reduce the high starting current as asynchronous motors start up directly and eliminate the negative influence to electrical equipment and mechanism that brought about by asynchronous when it starts up with reduced-voltage means, a new method based on power electronics technology for improving the starting characteristics of asynchronous motor is presented. It has three start modes: the ramp voltage start, the limit current start, and the pump-control start which is different from the traditional soft starter. We used MATLAB to establish simulation module of the three phase current voltage regulation circuit system, and tested the soft starter designed in the article, and the simulation result indicated that the soft starter with pump control function could not only effectively reduce the starting impact of the motor to the power grid, but reduce the impact from the water hammer and optimize the start performance of the motor.