Carolina A. Evangelista

• PhD Eng. in Electronics
• Universidad Nacional de La Plata and CONICET

Modern multi-energy systems aim to incorporate emerging renewable energies to minimize resource variability and improve power provision. Among these, marine energy converters show great promise within integrated energy systems, due to the abundance of underutilized marine resources and their higher predictability compared to other renewable sources...

In wave energy systems, in contrast to other renewable energy applications, the external input acting on the system is not a measurable quantity. Simultaneously, knowledge of this wave excitation force is essential for the operation of energy-maximising controllers. Considering these aspects, the problem addressed in this paper is that of the desig...

Accurate excitation force estimation is essential for wave energy control. Over the past two decades, multiple proposals have been developed, ranging from linear to nonlinear observers, and from simple Kalman-based estimators to a wide range of statistical approaches. In particular, sliding mode unknown input observers are an attractive alternative...

This work presents an algorithm for determining the parameters of a nonlinear dynamic model of the respiratory system in patients undergoing assisted ventilation. Using the pressure and flow signals measured at the mouth, the model’s quadratic pressure–volume (P–V) characteristic is fit to these data in each respiratory cycle by appropriate estimat...

This work presents an algorithm for determining the parameters of a nonlinear dynamic model of the respiratory system in patients undergoing assisted ventilation. Using the pressure and flow signals measured at the mouth, the model's quadratic pressure-volume characteristic is fit to this data in each respiratory cycle by appropriate estimates of t...

The energy from waves has a vast untapped potential to contribute to renewable energy supply and diversification. For that reason, wave energy conversion systems have been a topical research area in recent years. In particular, harnessing wave energy with an oscillating water column converter has proved to be one suitable solution, which has also s...

Motivated by the lack of comprehensive experimental implementation and assessment of the potential benefit that can be achieved with energy-maximising optimal control solutions for arrays of wave energy converters (WECs), we present, in this paper, the development, design, experimental implementation, and performance appraisal, of optimal moment-ba...

An efficient algorithm to estimate a respiratory system nonlinear model of sedated patients under assisted ventilation is presented. The considered model comprises an airways resistance and a volume-dependant compliance and, for each respiratory cycle, the proposed algorithm provides online the model parameters guaranteeing a minimum accuracy, abov...

This paper presents a hardware-in-the-loop assessment of a moment-based optimal controller including a robust super-twisting tracking term. The aim of the overall control structure is to maximise the energy extracted by a flap-type wave energy converter. An experimental assessment is performed via hardware-in-the-loop testing, which allows experime...

Energy-maximising control has proven to be of fundamental aid in the pathway towards commercialisation of wave energy conversion technology. The WEC control problem is based upon the design of a suitable control law capable of maximising energy extraction from the wave resource, while effectively minimising any risk of component damage. A particula...

Wave energy converters (WECs) inherently necessitate appropriate control technology to operate at optimal efficiency. A particularly well-established family of WEC controllers is based upon a composite structure, where an optimal velocity reference is generated via direct optimal control procedures, followed by a suitable tracking control strategy....

Energy-maximising control has proven to be of fundamental aid in the pathway towards commercialisation of wave energy conversion technology. The WEC control problem is based upon the design of a suitable control law capable of maximising energy extraction from the wave resource, while effectively minimising any risk of component damage. A particula...

En este trabajo se presenta la estimación de parámetros de un modelo no lineal del sistema pulmonar en pacientes con COVID-19 bajo respiración asistida. El algoritmo utiliza señales de flujo y presión medidos en la boca del paciente. Estas señales se obtuvieron durante la maniobra de titulación de PEEP, la cual busca mejorar la mecánica pulmonar de...

Resumen-Este trabajo presenta el control de un dispositivo de columna de agua oscilante, que incluye un generador sincrónico de imán permanente, para la extracciónóptima de potencia. Se diseñan dos controladores de modo deslizante de segundo orden adaptables, que funcionan de manera robusta en modo deslizante real y muestran una notable mejora en l...

En este trabajo se presenta un algoritmo de estimación on-line de parámetros del modelo pulmonar bajo respiración asistida. La metodología propuesta combina diferenciadores por Modo Deslizante filtrantes con un estimador por mínimos cuadrados recursivo con factor de olvido, para lidiar con la variación temporal de los parámetros. Asimismo, se compl...

A new control methodology derived from higher order sliding mode control (HOSMC) strategy has been recently presented. It ensures high accuracy and requires reduced control effort and chattering; however, only finite time convergence has been proven. In this paper, this controller is revisited and domains of convergence are given for some cases. Th...

Ocean waves are an important renewable energy resource and several fields of R&D are concurrently working to improve technologies for harnessing their power. In that context, this paper presents a control to optimize the performance of oscillating water column systems. As a first contribution, a novel criterion to attain maximum wave energy extract...

Resumen—El control por Modo Deslizante ha demostrado ser una potente tecnica de diseño de controladores robustos para una variedad de aplicaciones. No obstante, la aplicación de acciones de control discontinuas da origen a efectos no deseados, manifestándose el chattering (oscilaciones de alta frecuencia) como uno de los más perjudiciales. Desde ha...

INTRODUCCIÓN Este trabajo es parte de una línea de investigación del Instituto LEICI, en el área de análisis y apoyo a pacientes ventilados mecánicamente. En la misma se orientan los trabajos al desarrollo de modelos matemáticos lineales y no lineales de la mecánica pulmonar, así como también a la mejora de las máquinas de respiración asistida y la...

The control of a new structure of twin wind turbines (TWT) is presented in this paper. This new concept includes two identical wind turbines ridden on the same tower, which can pivot face the wind with no additional actuator. The motion of the arms carrying the TWT is free. The control law based on sliding mode controller is designed to track the m...

En este trabajo se presenta un sistema emulador de turbinas eólicas altamente versátil, desarrollado a los efectos de disponer de un dispositivo que permita reproducir experimentalmente en laboratorio el comportamiento de diversos tipos de turbinas bajo condiciones de operación controladas. Esta herramienta es esencial para la elaboración, ensayo y...

In this chapter, an adaptive second-order sliding mode technique is exploited to optimize the efficiency of a variable-speed wind turbine. A revisited form of a recently proposed adaptation algorithm is proposed to deal with the characteristics and control requirements of the wind energy conversion system (WECS), particularly model uncertainties an...

In this paper, a novel adaptive second-order sliding mode technique to optimize the efficiency of certain types of variable-speed wind turbines is developed and analyzed. A revisited form of a recent adaptation algorithm is proposed to deal with the characteristics and control requirements of wind energy conversion systems (WECS), particularly mode...

In this paper a novel time-based adaptive second-order sliding mode (SOSM) technique to optimise the efficiency of a variable-speed wind turbine is developed and analised. A revisited form of a recent time-based adaptation algorithm is proposed to deal with the characteristics and control requirements of the wind energy conversion system (WECS), pa...

This work presents a controller based on a Super-Twisting (ST) algorithm with variable gains, designed to maximize the efficiency of a fuel cell (FC). The strategy consists on regulating the oxygen excess ratio, maintaining it at an optimum value in spite of external disturbances and model uncertainties. The tested algorithm has the well-known adva...

This study proposes a power control strategy for a grid-connected variable-speed wind turbine, based on a doubly-fed induction generator (DFIG) with slip power recovery. The control objectives vary with the zones of operation (dependant on the wind speed), aiming to maximize the active power in the partial load zone and to limit it when operating w...

This work explores an adaptive second-order sliding mode control strategy to maximize the energy production of a wind energy conversion system (WECS) simultaneously reducing the mechanical stress on the shaft. Such strategy successfully deals with the random nature of wind speed, the intrinsic nonlinear behavior of the WECS, and the presence of mod...

The purpose of this paper is to present a control strategy using Multiple Input/Multiple Output (MIMO) Second Order Sliding Modes (SOSM) for a grid-connected variable-speed Wind Energy Conversion System (WECS). The latter is based on a Double Fed Induction Generator (DFIG) in a bidirectional configuration with slip power recovery. Its points of ope...

This study presents the control of a variable-speed wind energy conversion system based on a brushless doubly fed reluctance machine. The control objectives are the tracking of the maximum power conversion point and the regulation of the reactive power injected by the generation system into the grid. The control design is approached using multi-inp...

This paper presents a high-order sliding mode control strategy that aims to optimize the power conversion efficiency of a wind energy conversion system within the partial load zone of operation. The main challenges of this control problem are related to the random variations of the wind speed, the nonlinear nature of the whole system, usual model u...

This paper presents a complete control scheme to efficiently manage the operation of an autonomous wind based hydrogen production system. This system comprises a wind energy generation module based on a multipolar permanent magnet synchronous generator, a lead-acid battery bank as short term energy storage and an alkaline von Hoerner electrolyzer....

This paper studies the applicability of second order sliding mode control strategies to a wind energy conversion system aiming to optimise its power conversion efficiency. Four different controllers are designed and analysed, based on the “sub-optimal”, “twisting”, “super-twisting” and “with a prescribed law of variation” algorithms, which present...

An adaptive second order sliding mode control strategy is explored in this work, to maximize the energy extracted from the wind in a wind energy conversion system (WECS). It is required to such strategy to deal with the nonlinear nature of the WECS, the randomness of the wind speed, model uncertainties and external disturbances, and also with the n...