HDL Coder-based FPGA Implementation of a Continuous-Discrete Time Observer for Sensorless Induction Machine

Abstract

A continuous-discrete time high gain observer (CDHGO) for sensorless control of an induction machine (IM) is proposed in this paper. From only the two undersampled and noisy stator current measurements, an estimation of the IM states variables such as rotor flux, mechanical speed, and the load torque is achieved. Precisely, After a mild change of state coordinates that transform the IM model into the quasi-block triangular form, both observation stages are designed in a cascade structure. A hardware implementation of the CDHGO is carried out in the FPGA target by using advanced Matlab tools namely HDL Coder and Fixed Point Designer. Through the ModelSim software, a validation of the implemented algorithm is performed, where the estimates brings closer the those provided by the model despite the lack of information between the sample instants and the presence of the measurements noise.

Additional information

Notes on contributors

Moez Besbes

Moez Besbes received his BS and MS degrees in automatic and signal processing from ENSIT, Tunis, Tunisia in 2001 and 2005, respectively. He is currently a secondary professor in electric engineering, Tunisia. His research interests include state observation, controller design and FPGA implementation of electrical machine drives. Email: [email protected]

Salim Hadj Saïd

Salim Hadj Saïd received PhD and academic accreditation in electric engineering from ENIT in 2009 and ENIM in 2015, respectively. He is currently an assistant professor of Automatic at Preparatory Institute for Engineering Studies of Monastir (IPEIM), Tunisia. His research interests include robust observation, predictive and back-stepping control. Corresponding author. Email: [email protected]

Faouzi M'Sahli

Faouzi M'Sahli received his BS and MS degrees from ENSET, Tunis, Tunisia in 1987 and 1989, respectively. In 1995, he obtained his PhD degree in electrical engineering from ENIT, Tunisia. He is currently a professor of electrical engineering at National School of Engineers, Monastir, Tunisia. His research interests include modeling, identification, predictive and adaptive control of linear and nonlinear systems. He has published over 80 technical papers and co-author of a book “Identification et commande numérique des procédés industriels”, Technip editions, Paris. Email: [email protected]