A switching-loss
reduction strategy for improving the efficiency of three-level inverters
This paper investigates
a generalised discontinuous pulse width modulation (DPWM) technique designed to
minimise switching losses in three-level inverters. The proposed approach
addresses one of the primary sources of power loss in multilevel power converters
by strategically reducing the number of commutations per switching period. The
study compares the performance of various DPWM strategies with that of the
conventional hybrid space vector modulation (HSVM) method using detailed
MATLAB/Simulink simulations. The results show that switching losses can be
significantly reduced by a third compared to the classical PWM technique. However, the
proposed technique leads to a deterioration in Total Harmonic Distortion
(THD)
relative to the conventional method, while staying within acceptable
operational standards.
These findings highlight the capability of the proposed technique to
effectively balance inverter efficiency and output waveform quality. The
proposed method presents a promising way to enhance the performance of
high-power and high-efficiency applications, such as motor drives and renewable
energy conversion systems.
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