Combined voltage oriented control and direct power control based on backstepping control for four-leg PWM rectifier under unbalanced conditions
AbstractThis study focuses on a backstepping control (BSC) of a three-phase four-leg pulse width modulation (PWM) rectifier under balanced and unbalanced load and grid conditions. The proposed BSC for three-phase four-leg PWM rectifier connected to the grid is build up using three independent backstepping controllers based on Lyabonov theory to control simultaneously DC voltage and input currents. As a result, unit power factor, stable DC-bus voltage, sinusoidal input four-leg PWM rectifier currents with a lower harmonic content and lower zero sequence and natural currents can be accurately achieved. Not only that, stability and robustness against voltage grid fluctuations, load and filter inductance variations can also be carried out. The effectiveness, superiority, good dynamic, and steady-state performances of the proposed BSC based four-leg PWM rectifier have been validated by numerical simulations compared to the conventional proportional-integral control (PI) under balanced and unbalanced load and grid conditions.
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