Performance Evaluation of FLC Based Three-Pha...

Performance Evaluation of FLC Based Three-Phase PWM AC Chopper Drive Using HBCC Technique

Author Name : R. Linga Swamy, A. Jyothsna

ABSTRACT

This work proposes a control method for FLC based three-phase PWM AC chopper for PFC by utilizing Hysteresis Band-Current Controller (HBCC) approach fed three phase squirrel cage IM with soft start and speed controlling modes. Generally, four IGBTs are used for developing the three-phase PWM AC chopper. The four IGBTs are driven by a novel closed-loop control approach that employs only two gate pulses. The three major control modes are operated through control scheme achieved by changing the RMS value of source voltage provided to the terminals of IM drive. The control method utilizes the Proportional-Integral (PI) controlling for regulating the error sequences. But, this PI scheme is un-popular due to improper selection of gain values which reduces the stable performance of IM drive system. This issue is eliminated by adopting the intelligent Fuzzy-Logic Controller (FLC) in place of classical PI control scheme. The FLC scheme utilizes the linguistic information provided by knowledge base through universal-approximated technique which eliminates the error sequences and enhances the stable performance. The proposed FLC-HBCC technique is developed in three-phase PWM controlled AC chopper for getting operating modes by using Matlab-Simulation tool, simulation waveforms of various operating conditions are presented.

Keywords: AC Chopper, Induction Motor Drive, Fuzzy-Logic Controller, Zero-Cross Detection, Hysteresis Band-Current Controller