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In this paper, a simple and robust speed estimator and Pseudo Derivative Feedback (PDF-PDF) controller are proposed for sensorless PMSM drive to improve its performance at standstill and low speed regions. The speed estimator is formed using stator flux and electromagnetic torque based model reference adaptive system, which performs better during transient conditions and reduces steady state error...
This paper presents a comprehensive evaluation of PI controller and proposed pseudo derivative feedback (PDF) controller based direct torque controlled (DTC) permanent magnet synchronous motor (PMSM) drive. The proposed controller eliminates oscillation and overshoot in the actual rotor speed and significantly reduces the flux, torque and stator current ripples. The performance of the proposed controller...
This paper proposes a comparison between the PWM control and Digital control strategy between cascaded multilevel inverter where the conventional method produces 2n+1 output level for n independent DC sources and the digital control strategy produces 2n+1−1 output level for the same n independent DC sources also with the same number switches. This paper also brings out the advantage of using Digital...
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