WSEAS Transactions on Power Systems
Print ISSN: 1790-5060, E-ISSN: 2224-350X
Volume 16, 2021
Performance and Tracking Control of Three-Phase Induction-Motor Drive Fed from a DC-Modified Nano-grid
Authors: ,
Abstract: Nowadays, induction motor (IM) can be used in tracking systems to follow a predefined path like in
robotics and servos. The modified nanogrid is a small scalable-renewable energy intermittent source that powers
loads via a single-stage inverter (SSI). Higher utilization of the inverter dc-link voltage improves its output
voltage and dependently, the performance of the motor tracking speed. So, this paper proposed a switched boost
inverter (SBI) to feed IM from PV-source to boost its dc-link output voltage. The usage SBI utilizes minimum
passive components, more active elements, introduces shot-through mode as z-source inverter and produces both
ac and dc voltages simultaneously. The performance of the motor-tracking speed depends directly on the motorstator voltage. So, the proposed method depends mainly on two parameters to verify the pre-defined trajectory
speed. The first proposed intention is a simple algorithm for a closed-loop dc-link boosting control based-on the
reference model to compute the optimum duty ratio (D). The second one depends mainly on the modulation index
(M) to produce the reference signals needed to adjust the speed of the motor through a (voltage/frequency) control
of a predefined value. The modelling and validation of the proposed system was implicit with the help of Matlab/
Simulink package. The robustness of the system has been tested by selecting several speed trajectories and was
able to track them. Furthermore, SBI-based system was compared with other VSI-inverter techniques such as the
space-vector PWM single- and two-stage VSI inverters. Test results explored that the SBI-based system is a
strong competitor to other inverter techniques especially at low-voltage intermittent supply.
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Keywords: Induction motor Drive (IM), Photo-voltaic (PV), Switched Boost Inverter (SBI), Modified
Nanogrid, Tracking Control
Pages: 8-21
DOI: 10.37394/232016.2021.16.2