Dynamically Reconfigurable Control Structure for Induction Motor Drives on FPGA Control Platform

Abstract

The concept of dynamic reconfiguration of controls is commonly known in Fault Tolerant Control (FTC) systems. The general idea of this concept is highlighted and that can be extended to achieve the optimal performance from a plant in its whole operating region. Today, many industrial standard drives provide more than one control scheme for the drive control. The customer may chose between, e.g., flux-oriented control (FOC) and constant voltage frequency ratio control (v/f). However, the dynamic (on-the fly) change-over between these control schemes is usually not available as a feature, although it may be essential e.g. in cases of handling different operating modes optimally or as a fallback strategy in case of faults. The main emphasis of this contribution is to present the detailed concept, implementation and the experimental validation of dynamic reconfiguration between the well known control schemes for the induction machine. The idea is not only to show the switch-over between different control schemes, but also to utilize field-programmable gate arrays (FPGA) as basis for controller implementation. The inherent parallel execution of FPGA makes it easy to implement such dynamically reconfigurable control structure on a single control platform.