Title :
Position estimation in a true asymmetric cascade H-bridge multilevel inverter
Author :
Saleh, Khaldoun ; Sumner, M.
Author_Institution :
Univ. of Nottingham, Nottingham, UK
fDate :
Aug. 30 2011-Sept. 1 2011
Abstract :
This paper introduces a new method to track the saliency of motor fed by a multilevel inverter through measuring the dynamic current response of the motor line currents due the IGBT switching actions. The method uses only the fundamental PWM waveform (i.e there is no modification to the operation of the multilevel inverter) similar to the fundamental PWM method proposed for a 2-level inverter. Simulation results are provided to demonstrate the performance of the complete sensorless speed control of a PM motor driven by such a converter over a wide speed range. Finally the paper introduces a comparison between the 2-level inverter and the multilevel inverter in terms of the reduction of the Total Harmonic Distortion (THD) using the fundamental PWM method in both cases.
Keywords :
PWM invertors; PWM power convertors; angular velocity control; cascade systems; electric current measurement; harmonic distortion; insulated gate bipolar transistors; motor drives; permanent magnet motors; power semiconductor switches; sensorless machine control; switching convertors; IGBT switching action; PM motor; THD reduction; asymmetric cascade H-bridge multilevel inverter; dynamic current response measurement; fundamental PWM waveform; motor line currents; motor saliency track method; position estimation; sensorless speed control; total harmonic distortion; Equations; Insulated gate bipolar transistors; Inverters; Pulse width modulation; Switches; Topology; Voltage control; 2-Level Converter; Multilevel converter; SVPWM; Sensorless;
Conference_Titel :
Power Electronics and Applications (EPE 2011), Proceedings of the 2011-14th European Conference on
Conference_Location :
Birmingham
Print_ISBN :
978-1-61284-167-0
Electronic_ISBN :
978-90-75815-15-3
