Abstract
In this paper, an adaptive PI controller using a multi-level DC link (MLDCL) inverter is proposed and applied for angular position trajectory tracking in a permanent magnet synchronous motor (PMSM) with relatively low stator inductance and resistance. Modern lightweight motors have smaller resistance and inductance values when compared to conventional motors, which give rise to higher levels of current ripples when using large PWM frequencies. To alleviate the problem, the proposed controller combines the merits of a multi-level DC link inverter with a multivariable sliding-mode extremum seeking tuned PI controller to achieve fast and precise trajectory tracking. The extremum seeking tuning method adjusts the PI gains in realtime which makes the system tracking performance more precise. The MLDCL inverter used in this paper reduces the PMSM current ripples of the three-phase inverter through utilizing multiple half-bridge cells instead of an individual DC source used in traditional pulse-width modulation (PWM) inverters. The tracking performance of the proposed control scheme is investigated through simulations by comparing the results with a recently proposed fixed-gain PI controller using a traditional PWM inverter. The results demonstrate the effectiveness of the proposed controller in achieving lower torque ripples and more precise tracking response.
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