Implementation of Direct Torque Control of an Induction Motor with high gain observer on FPGA

Abstract

The Conventional Direct Torque Control (CDTC) of Induction Motor (IM) with an open loop estimator of stator flux suffers from problem like the correction of measurement errors of the stator current and estimation errors of stator flux and the problem of integration particularly at low speeds. To solve these problems, we use the high gain observer (HGO). This observer is used to estimate the stator flux, the stator currents, the load torque and the mechanical speed. In this paper, we investigate the hardware implementation method of Direct Torque control with High Gain Observer on FPGA using a Xilinx System Generator tool that generates synthesizable VHDL (VHSIC Hardware Description Language) code. The advantages of this method are the rapid time to market, real time and portability. The model of the CDTC with HGO has been designed and simulated using Xilinx System Generator blocks, synthesized with Xilinx ISE 12.4 tool and implemented on Xilinx Virtex-V FPGA.