Hybrid Pwm Based Mras Speed Observer for Sensorless Control of Induction Motor Drive
نویسندگان
چکیده
This paper presents a novel method of Hybrid pulse width modulation (HPWM) algorithm for control of induction motor drive based on model referencing adaptive system (MRAS). In the conventionally used space vector pulse width modulation (CSVPWM) scheme the duration of zero voltage application is equally distributed in each and every sampling period. In this is paper a HPWM is presented for sensorless controlled induction motor using MRAS to reduce steady state ripples. The proposed method is developed on stator flux ripple notion which is nothing but a measurement for ripple in line current. The proposed HPWM method for induction motor is developed by using the expressions for mean square flux ripple over a sub-cycle for each switching sequence. By using the proposed method the performance of the drive is improved at different modulation indices. The simulations have been carried out and the results are presented and analyzed.
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