Experimental Validation of Very-Low and Zero Speed Operation of a Flux-Eliminated Adaptive Estimator for Vector Controlled IM Drive

The performance of a flux-eliminated MRAS at very low and zero speed is investigated experimentally in this paper. The estimator is formed with the Model Reference Adaptive System (MRAS). Instantaneous reactive power is considered in the reference model of the MRAS, whereas, the adjustable model is based on steady state reactive power under flux oriented condition. The use of flux oriented steady state reactive power in the adjustable model eliminates flux computation. Also, the method is independent of stator resistance variation. These make the scheme simple, easy to implement and suitable for low speed application. The algorithm is experimentally validated with a laboratory developed prototype using dSPACE-1104 controller board. Experiments have been performed at very-low speed and zero speed to confirm the usefulness of the proposed controller.