MODELING AND ANALYSIS OF CLOSED-LOOP SLIP ENERGY RECOVERY INDUCTION-MOTOR DRIVE USING A LINEARIZATION TECHNIQUE

In this paper, a fourth order nonlinear model is derived from the prev iously developed model [1] for an open-loop slip energy recovery induc tion motor drive. The nonlinear transient model of the open-loop drive is linearized around a steady-state operating point using a small sig nal perturbation technique and the transfer functions which relate the input and output variables are derived. The block diagram for the clo sed-loop control system is obtained. The responses of the Proportional plus Integral (PI) controller employed to control the rotor speed and the PI controller used to control the dc link current are predicted a nd compared with experimental results.