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Publications

Publications by Rui Esteves Araujo

2020

A survey of the modeling of switched reluctance machines and their applications

Authors
Mamede, ACF; Camacho, JR; Araújo, RE;

Publication
U.Porto Journal of Engineering

Abstract
The main objective of modeling a switched reluctance machine is to derive a mathematical function to relate the outputs to the inputs. Due to the nonlinear relationship between the variables of torque, flux linkage, current and angular position of the rotor, Switched Reluctance Machine (SRM) modeling is a very challenging task and an open problem. Modeling is usually done in two situations, modeling a single machine, or modeling a set of machines. Each one must fulfill different requirements. This work presents a survey of different SRM modeling approaches, evaluating its advantages and limitations when modeling a single machine or a set of machines.

2020

Vehicle Lateral Dynamic Identification Method Based on Adaptive Algorithm

Authors
Lopes, A; Araujo, RE;

Publication
IEEE OPEN JOURNAL OF VEHICULAR TECHNOLOGY

Abstract
The development of advanced driver assistance systems relies on an accurate estimation of the tire-road friction coefficient and cornering stiffness of the vehicle, which are closely linked to internal and external driving conditions. In this paper, an identification algorithm capable of simultaneously estimate the friction coefficient and cornering stiffness of the front and rear tires is pursued. A nonlinear adaptive law is proposed for the estimation of vehicle parameters under certain excitation conditions. It is shown that, by exploring the lateral dynamic of the vehicle, the convergence of the parameters to their true values can be guaranteed. A comprehensive study has been carried out in order to reveal the necessary conditions for convergence and observability of the parameters. Simulation results with a high fidelity full order Carsim model show a good performance of the proposed identification method.

2020

Virtual Inertia and Droop Control Using DC-Link in a Two-Stage PV Inverter

Authors
Ramos, JG; Araujo, RE;

Publication
2020 IEEE 14TH INTERNATIONAL CONFERENCE ON COMPATIBILITY, POWER ELECTRONICS AND POWER ENGINEERING (CPE-POWERENG), VOL 1

Abstract
The loss of rotational inertia in the future power systems motivate the need to find new technical solutions for this challenge. Many solution have emerged in last years based on power converters with emulation of inertia. In this paper, we explore the concept of distributed virtual inertia (DVI) by investigating a new control method that use the common DC bus capacitors in the DC link of the converter as a buffer of energy to provide an equivalent mechanical inertial response. Using time-domain simulations with a detailed two-stage Photovoltaic (PV) inverter, we observe and discuss the benefits in the grid frequency.

2020

Modelling and Control of Switched Reluctance Machines

Authors
Esteves Araújo, R; Roberto Camacho, J;

Publication

Abstract

2020

Review of Rotary Switched Reluctance Machine Design and Parameters Effect Analysis

Authors
Camila Ferreira Mamede, A; Roberto Camacho, J; Esteves Araújo, R;

Publication
Modelling and Control of Switched Reluctance Machines

Abstract

2020

Switched Reluctance Motor Modeling and Loss Estimation Review

Authors
Sousa Melo, P; E. Araújo, R;

Publication
Modelling and Control of Switched Reluctance Machines

Abstract

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