Research On Boost Chopper Type Slip Energy Recovery Drive System

The Slip energy recovery drive system (SERDS) as a high efficient and reliable scheme is more suitable than variable frequency variable speed system for the second order torque load such as pump or fan.In this paper, the basic principle and the power factor of conventional SERDS are discussed. Aiming at its shortage of low power factor, boost chopper type SERDS is adopted. The equivalent circuit of the new scheme is built up, and then vector diagram is used to analyze the power factor of the system, also the harmonic distortion of the system is discussed. The experiment device is established base on a 380F/7.5 kW induction motor and a passive soft switching scheme is applied in order to improve the working condition of IGBT. At last, the experimental results are shown.Experimental results show that the boost chopper can notably improve the power factor and reduce the harmonic distortion of the system, and make reactive power compensation more economically. The experiment device works reliably and the soft switching scheme can improve the switching condition of IGBT efficiently.