Experimental Verification of Speed Control of IM Fed by Sinusoidal-VSI with Active LC-LPF via IRM-ILQ Control

The output voltage of PWM inverters used for induction motors (IM's) contains many harmonic components due to switching. This causes electromagnetic interference (EMI) problems, torque ripple, and noise. The LC-LPF is effective in removing these harmonic components. However, due to resonant phenomena of LC-LPF, it is difficult to realize a stable operation with a wide range of operation. Simulation has revealed that the Inverse Linear Quadratic control with Inverse Reference Model (IRM-ILQ control) based on multivariable two-degrees-of-freedom control, provides a robust and stable control. In this paper, stable and accurate velocity control of sinusoidal VSI using active LC-LPF fed IM is experimentally verified.