| This paper presents a new speed regulating system——high frequency chopping cascade control system,which adopts insulated-gate bipolar transistor(IGBT)as DC chopper. Compared with conventional cascade control system, high frequency chopping cascade control system increases the power factor ,restrains harmonic .In order to study the performance index and analyze the design scheme of high frequency chopping cascade control system , a simulation model of this system was built by using Power System Blockset (PSB) and Simulink of MATLAB . This model is simple and convenient. The result of the simulation is practical and reasonable. According to the simulation result and the theory of dynamic correction of conventional cascade speed regulating system,dynamic mathematical model of chopping cascade control system is deduced and closed loop control system with double loops of rotor speed and current is designed , which is verified by simulation. |
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