Type-1 and Type-2 fuzzy logic speed controller based high performance direct torque and flux controlled induction motor drive

In this research study, a new speed control scheme is proposed for direct torque and flux control (DTFC) of induction motor drive (IMD) to replace the conventional constant gain PI-speed controller (PISC). The conventional PISC offers poor dynamic response of stator current, torque and motor speed under sudden change in speed or load torque disturbances. In order to improve the dynamic as well as the steady state performance and minimize the ripple contents and also motor speed drops under load torque conditions, a new Mamdani type, triangular membership function (M.F) based Type-2 fuzzy logic speed controller (T2FLSC) is proposed, which is replaced in place of PISC. The proposed Type-2 FLSC is extension of Type-1 FLSC, which is very effectively control under sudden load torque disturbances and sudden change in speed conditions. A detailed simulation results are carried out when an IMD is operating in forward and reversal motoring under no-load, load, sudden change in speed and zero speed conditions.