Arthur H. R. Rosa

Passivity-based control of PFC boost converter with high-level programming

This paper presents a procedure for high-level programming of a microcontroller using passivity-based control implemented in PFC (Power Factor Correction) boost converters. This is a non-conventional approach, where libraries are used to directly interface with the Texass DSP 2812. Initially, the block diagrams that contain the control equations are constructed. Then, the codes are generated automatically. The advantages provided by the proposed method are: economy of development cycle time, easy understanding of the control process and programming, standardization and concurrent simulation. The other contribution of the paper refers to the development of a regulated source with high power factor and low THD using a boost converter controlled via passivity-based method. The approach based on passivity has been studied recently due to clear advantages in view of disturbances in the operation conditions of the system. The purpose of this technique is to improve the converter efficiency in applications of low and medium power, and improve the quality of the energy in the grid. Finally, in a new and satisfactory way, this nonlinear control technique has been validated experimentally for boost converters.

Stability in passivity-based boost converter controller for power factor correction☆

Abstract This paper addresses the control of Boost converters applied for Power Factor Correction in universal-line applications with unknown load, using adaptive nonlinear control based on passivity. The closed loop system stability is discussed based on the analysis of the internal dynamics resulting from the use of the proposed control strategy. The performance of the proposed PFC rectifier is tested on an experimental 630-W universal-line PFC prototype.

Hardware in the loop simulation of non linear control methods applied for power converters

This paper presents a Hardware in the loop (HIL) simulation of a microcontroller using non-linear control implemented in PFC (Power Factor Correction) boost, buck and SEPIC converters. This is a non-conventional approach, where libraries are used to directly interface with the Texass DSP 2812. Initially, the block diagrams that contain the control equations are constructed. Then, the codes are generated automatically. The advantages provided by the proposed method are: security, economy of development cycle time, easy understanding of the control process and programming, standardization and concurrent simulation. Three nonlinear control techniques - state feedback linearization (SFL), passivity based control (PBC) and interconnection and damping assignment passivity-based control (IDA-PBC) has been validated experimentally using HIL simulation for boost, buck and SEPIC converters.

Comparison of nonlinear control techniques applied to SEPIC and CUK converters with reduced modeling and hybrid solutions

This paper presents a study and comparison of nonlinear control techniques applied to SEPIC and CUK converters with reduced modeling and hybrid solutions based on boost converter. Three nonlinear control techniques — state feedback linearization (SFL), passivity based control (PBC) and interconnection and damping assignment passivity-based control (IDA-PBC) has been validated experimentally using HIL simulation for boost and SEPIC converters. Simulation results are also presented for these converters and control methods.

A study and comparison of nonlinear control techniques apply to second order power converters using HIL simulation

This article aims to study and comparison of nonlinear control techniques applied to static power converters type: buck, boost, buck-boost and flyback. Although they are basic building blocks in electronics, these converters have attracted growing interest in the power electronics and control areas. This is due to the diversity of applications including since household appliances to sophisticated electrical systems. Greater emphasis is given to the boost converter because it is the only converter analyzed with power factor correction (PFC), since it is the most suitable for this specific application. The other systems are analyzed as control voltage regulators (DC-DC) in which the input voltage comes up to a constant value. Due to a vast new field for nonlinear controls of converters, because they offer a more natural response and, especially, make electronic systems more efficient, nonlinear control algorithms are obtained and implemented: state feed-back linearization (SFL), passivity based control (PBC) and interconnection and damping assignment passivity-based control (IDA-PBC). Taking into account that many control laws require validation, this work employs high level programming with Malab / DSP integration using Hardware in The Loop (HIL) Simulation. This methodology facilitates the testing and collection of results and reduces the development cycle of the project.

Passivity-based control of boost converters using PLL

In the context that involves low and medium powers, boost-type converters have high performance and is therefore strongly recommended to work in regulated sources. However, without adequate control such converters eventually provide high levels of THD (Total Harmonic Distortion) and low power factor (pf). In this way, different authors validated the passivity-based control (PBC) applied to static converters. However, through these studies it was observed that the quality of results is associated with the input signal voltage. Thus, the insertion of the PLL (Phase-Locked Loop) is justified by the poor quality of networks in general. That is usually the power supply voltages are not purely sinusoidal and have very harmonic content. Thus, lower THD levels can be obtained by adding the PLL for imposing a sinusoidal reference signal to the input voltage.