Speed sensorless control of an induction machine using a PWM inverter with output LC filter

摘要

A method of controlling of an induction machine using an inverter with output LC filter. The method comprising the steps of determining the inverter output current vector (iA), determining the inverter output voltage vector (uA), forming a full-order observer having a system matrix (Â) and gain vector (K), the observer producing the estimated rotor flux linkage vector (Ψ̂R), the estimated stator current vector (îs), the estimated stator voltage vector (ûs and the estimated inverter output current vector (îA), determining the estimation error (iA-îA) of the inverter output current vector, forming a speed adaptation law based on estimation error of the inverter output current vector for determining the estimate for electrical angular speed (ω̂m) of the induction machine, and controlling the induction machine based on the produced estimates and the measured inverter output current.