Experimental Research on FPGA based Novel Control for Matrix Converter Fed Induction Motor Drive
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Date
2019
Authors
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Publisher
MPUT, UDAIPUR
Abstract
Induction motor drives are used in industrial and process applications which require
high performances. It is desired in high-performance drive systems, that the speed of
motor should closely follow the reference trajectory regardless of any load
disturbances within limits, parameter variations and model uncertainties. In most of
the industrial applications hard acceleration, deceleration, the inability to vary the
speed and torque causes a serious problem. However, in some applications there are
requirement of constant speed. Induction motor drives provide the solution of these
problems by various types of control strategy using different controlling parameters
with modifying the voltage and frequency of the AC supply. In induction motor the
high dynamic performance can be obtained similar to dc motors, with the recent
advances in power semiconductors and their switching techniques, integrated
circuits like FPGAs, microcontrollers and DSPs; and development in control
strategies.
This work mainly focuses on the development of fuzzy logic based DTC controlled
matrix converter fed induction motor drive using FPGA. Space vector PWM
switched Matrix converter along with fuzzy logic based DTC control provides the
basic platform to accomplish the research objectives in both hardware and software
aspects. The torque and flux of the induction motors can be controlled independently
using vector control. The use of matrix converters yields the advantage of compact
size, less weight, almost sinusoidal input output waveforms and lack of energy
storage device over the conventional converter. It is possible to achieve the
combined advantages of direct torque control and matrix converter using DTC based
matrix converter fed induction motor drive.
The FLC based DTC controlled MC fed IM drive is first developed using
MATLAB/Simulink and, then a laboratory 1.5 kW prototype of proposed system is
built using FPGA board to conduct detailed experimentation for validation of fuzzy
control and SVPWM under different input/output and balanced/unbalanced
conditions. The developed control system is implemented using Altium nano board
3000 which is mainly based on Xilinx Spartan XC3S1400an-FGG676 Field
programmable gate array (FPGA) using MATLAB/simulink-Xilinx toolbox. The
(xxi)
actual motor currents are measured by current sensors and fed back to the FPGA
board through the A/D channels. Rotor position is sensed by an optical incremental
encoder and is fed back to the FPGA board through the encoder interface. The
controller generates the space vector PWM signals for the control of matrix
converter fed induction motor drive.
Novelty of the presented work is that matrix converter with improved SVPWM and
fuzzy logic based DTC controller is experimentally investigated and validated for
three-phase induction motor drive. Also, it makes no assumptions on the input and
output frequencies of the matrix converter and so applicable under unbalanced input
and/or output conditions.
The work presents the experimental evaluation of proposed system, under various
abnormal conditions like change in load, supply, frequency, ride-through, misfire in
the converter, unbalancing of load and supply etc. The control system is
implemented in real time on a FPGA real time board. Simulation and experimental
results are presented using a laboratory 1.5 kW prototype of matrix converter fed IM
drive to demonstrate the resulting improvements of the developed system and its
control under steady-state and dynamic balanced/unbalanced conditions.
It also presents the comparative experimental and simulation results for developed
control system under different conditions to demonstrate the robust enhancement in
the steady-state and dynamic performance of proposed control over traditional
system. Also, experimental results were found consistent with the simulated results
except for slight differences caused by losses in practical system. Significant
improvement in output power, efficiency with low harmonic distortions, disturbance
rejection and ride-through capabilities provided by proposed system has been
confirmed through both computer simulations and experimental results.
Description
Experimental Research on FPGA based Novel Control for Matrix Converter Fed Induction Motor Drive
Keywords
Citation
Swami R.K. And Kumar V.