Control of a three‐phase AC/DC VIENNA converter based on the sliding mode loss‐free resistor approach

Abstract

The three-phase VIENNA rectifier supplying a regulated DC bus in a micro-grid architecture is controlled in this study by means of a sliding-mode regulation loop, which imposes a loss-free resistor (LFR) behaviour in each phase for power factor correction. Assuming equal parameters per phase and that the intermediate node between the output capacitors of the DC link is the neutral point of the AC generator, the rectifier can then be modelled as a tetra-port LFR with three decoupled resistive input ports and one output port characterised by a power source representing the input power absorbed by the rectifier. After demonstrating that the resulting sliding dynamics are globally stable, the control is analogically executed, this only requiring an analogue multiplier, several operational amplifiers and some auxiliary digitally implemented logic circuitry. Experimental results for different power levels and frequencies supplied by a low-power wind generator are in perfect agreement with the theoretical predictions.

Using low‐cost microcontrollers to implement variable hysteresis‐width comparators for switching power converters

“…T^s w (z) Finally, note that the effective hysteresis band is the result of adding algebraically to the constant value given by (22) the corresponding corrections introduced by the switching period regulation loop. Fig.…”

Efficiency comparison between Si and SiC‐based implementations in a high gain DC–DC boost converter

“…The corresponding control law has been designed by means of the sliding-mode control theory [27,[30][31][32][33] in order to describe the dynamic behaviour of the system employing a hysteretic modulator in the feedback loop when sliding motions can be induced.…”

Sliding Mode Control of the Isolated Bridgeless SEPIC High Power Factor Rectifier Interfacing an AC Source with a LVDC Distribution Bus

“…It has been demonstrated that this technique is able to track periodic references, forcing loss-free resistor behavior. This implies resistive behavior at the input port and power source behavior at the output port of a power converter [30], which in fact transforms the set rectifier-load into a virtual resistance, as it is successfully developed for a semi-bridge-less pre-regulator in the work of [31] and a three-phase HPF Vienna rectifier in the work of [32]. As in the case of the grid-connected inverters, the control must track a reference, which can be directly provided by a measurement of the input voltage or indirectly by a synchronized reference generator [33].…”