MODELING AND PERFORMANCE OF SLIP ENERGY RECOVERY INDUCTION-MOTOR DRIVES

The operation of slip energy recovery induction motor (1M) drives is complicated by the fact that the region of interest is centered on the rotor and not on the stator as in most other 1M drives. A detailed study of the rotor phenomena including the rectifier commutation overlap and inverter harmonics are facilitated by the use of the actual rotor state variables instead of transformed variables that are used in most other 1M drive systems. The use of the “natural” equations however, has the serious drawback of having a 6 x 6 inductance matrix that depends on the rotor angle and which must be inverted at each step of integration. This paper uses a newly proposed hybrid model which retains the actual rotor phase variables but trans formes the statol- only to examine the transient and steady state performance of a slip energy drive system. This new model does not have a variable inductance matrix that must be inverted at each step of the integration. The computer program developed can be used to examine the transient performance of slip energy recovery drives for the proper rating of semiconductor devices or to examine the effects of faults on the associated power system on the drive performance. Current and speed controllers designed using linear techniques can be evaluated using this program as well. © 1990 IEEE