Abstract:
A feed forward Variable Voltage Variable Frequency (VVVF) Controller Scheme
based on Voltage-Space Vector Pulse-Width Modulation (SVPWM) of Voltage
Source Inverter (VSI) is described. This thesis presents a new simple algorithm of
the Space-Vector PWM strategy. The scheme introduces a variable carrier
frequency, which can minimize the computation time as only two multiplications is
required to compute the time slices for each of the PWM cycles. An SVPWM
Control Application Specific Integrated Circuit (ASIC) is also proposed using Field
Programmable Gate Array (FPGA) technology. Using a single FPGA chip
(FLEX 10K IOLC84-3) for the practical implementation of the modulator, rather than
system consisted of microprocessor and external memory, achieves advantages like
less power and space consuming, short design time and reliability. Design Synthesis
of the ASIC is done using Very High Speed Integrated Circuit Hardware Description
Language (VHDL) and design entry tools provided by MaXPlusII.. The time
simulation of the FPGA chip is also performed using MaXPlusII. The time
simulation output of the proposed FPGA chip is tested and compared with the
conventional output.
