Download Digital Plug-In Repetitive Controller for Single

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Digital Plug-In Repetitive Controller for SinglePhase Bridgeless PFC Converters
Abstract:
This paper investigates a plug-in repetitive control scheme for bridgeless power factor
correction (PFC) converters to mitigate input current distortions under continuous
conduction mode and discontinuous conduction mode operating conditions. From the PFC
converter model and the fact that a type-II compensator is used, a design methodology to
maximize the bandwidth of the feedback controller is suggested. After that, the error
transfer function including the feedback controller is derived, and the stability of the
repetitive control scheme is evaluated using the error transfer function. The implementation
of the digital repetitive controller is also discussed. The simulation and experimental results
show that the input current THD is significantly improved by using the proposed control
scheme for a 1-kW single-phase bridgeless PFC converter prototype.
INTRODUCTION:
RIDGELESS power factor correction (PFC) converters which do not have a diode bridge
B rectifier have been extensively used in many applications due to high efficiency and
simple control features [1]-[3]. For the control of a bridgeless PFC converter, either an
analog or a digital controller can be employed, and most of the traditional control strategies
for boost PFC converters can be directly applied for controlling the bridgeless PFC
converter. Generally, a digital control scheme can easily implement various control logics
and sequences for the converter operation as well as interfacing an upper level controller in
convenient. One problem of the digital control scheme for the bridgeless PFC converter,
however, is that the current control bandwidth cannot be as high as an analog controller
due to the digital delay effects caused by the digital pulse-width modulation (DPWM) delay
and the digital computation delay. Accordingly, the performance of the input current
regulation with a digital controller is relatively poorer than the case with an analog
controller implementation.
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Architecture Diagram:
CONCLUSION
This paper discussed the plug-in repetitive control scheme for the bridgeless PFC converter.
To do this, the design procedure for the feedback and the feed-forward controllers was
discussed. After that, the proposed repetitive controller was designed to handle the current
distortion near the ZCP of the input voltage and the input current as well as compensating
the current harmonic components. The stability analysis for the PFC converter including the
proposed control scheme was performed. From this analysis, the control parameters for the
repetitive controller were selected. By using the designed repetitive controller, the current
distortion could be mitigated both in CCM and in DCM operations. Both the simulation and
experimental results verified the effectiveness of the proposed control scheme under
various operating conditions including transient and steady-state operations for the 1-kW
bridgeless PFC converter prototype.
References:
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www.frontlinetechnologies.org
[email protected]
+91 7200247247