DC Voltage Sensorless Predictive Control of a High-Efficiency PFC Single-Phase Rectifier Based on the Versatile Buck-Boost Converter

Abstract

Many electronic power distribution systems have strong needs for highly efficient AC-DC conversion that can be satisfied by using a buck-boost converter at the core of the power factor correction (PFC) stage. These converters can regulate the input voltage in a wide range with reduced efforts compared to other solutions. As a result, buck-boost converters could potentially improve the efficiency in applications requiring DC voltages lower than the peak grid voltage. This paper compares SEPIC, noninverting, and versatile buck-boost converters as PFC single-phase rectifiers. The converters are designed for an output voltage of 200 V and an rms input voltage of 220 V at 3.2 kW. The PFC uses an inner discrete-time predictive current control loop with an output voltage regulator based on a sensorless strategy. A PLECS thermal simulation is performed to obtain the power conversion efficiency results for the buck-boost converters considered. Thermal simulations show that the versatile buck-boost (VBB) converter, currently unexplored for this application, can provide higher power conversion efficiency than SEPIC and non-inverting buck-boost converters. Finally, a hardware-in-the-loop (HIL) real-time simulation for the VBB converter is performed using a PLECS RT Box 1 device. At the same time, the proposed controller is built and then flashed to a low-cost digital signal controller (DSC), which corresponds to the Texas Instruments LAUNCHXL-F28069M evaluation board. The HIL real-time results verify the correctness of the theoretical analysis and the effectiveness of the proposed architecture to operate with high power conversion efficiency and to regulate the DC output voltage without sensing it while the sinusoidal input current is perfectly in-phase with the grid voltage.

A Composite DC–DC Converter Based on the Versatile Buck–Boost Topology for Electric Vehicle Applications

“…In Figure 19 and Figure 20 , the size of the pie charts are proportional to the power loss. The power inductor losses are calculated as in [ 41 ], and the MOSFET conduction and switching losses are provided by the thermal model of the PLECS simulation. For the BBV converter, the total loss is composed of the MOSFET conduction loss, the MOSFET switching loss, the coupled inductor loss, and the damping network loss.…”

Measurements, Predictions, and Control in Microgrids and Power Electronic Systems

“…Generally, model predictive control (MPC) helps reduce the need for sensors, as predictive models allow for estimating variables required in real-time, where a modular rectification system and a finite-control-set MPC are presented to control the same system. This is demonstrated in [7] Contributions [8,9] of this Special Issue provide innovative approaches for generalizing sensorless control strategies for different types of DC-DC converters [8] and for rectifying AC-DC using DC-DC converters [9]. In the same context of DC-DC converters, it is wellknown that these converters can operate in continuous and discontinuous modes when they operate with synchronous commutation.…”

Co-Design of the Control and Power Stages of a Boost-Based Rectifier with Power Factor Correction Depending on Performance Criteria

“…The proposed SMC is based on the sliding-surface Φ reported in (6), where Ψ (7) is the switching function defining the surface. The operation of the system into that surface Φ forces the inductor current i L to follow the reference i r .…”

“…Taking into account that the current SMC is globally stable, the sliding surface (6) ensures that i L = i r . Therefore, the voltage differential Equation ( 4) of the averaged model is modified as given in (36), where v dc is the averaged DC voltage at the converter output, and i r represents the averaged value of the current reference.…”

“…PFC rectifiers can be implemented with different DC/DC converter topologies such as Boost, Buck [5], Buck-Boost [6], Cuk [7], Sepic [8], and Flyback [9], among others. However, Boost-based PFC rectifiers are the most widely adopted topology in the literature, since the Boost converter provides continuous input current, requires few elements (i.e., low cost), has a simple model, and has a simpler analysis and control design than Cuk-and SEPIC-based rectifiers [1,2].…”