Search Results for author: Romeo Ortega

Found 18 papers, 0 papers with code

Nonlinear Voltage Regulation of an Auxiliary Energy Storage of a Multiport Interconnection

no code implementations29 Mar 2024 Felipe Morales, Rafael Cisneros, Romeo Ortega, Antonio Sanchez-Squella

In this article, we propose a nonlinear voltage control to ensure power exchange in a multiport interconnected system, which consists of a bidirectional DC-DC converter and generating-storing devices.

A New Adaptive Phase-locked Loop for Synchronization of a Grid-Connected Voltage Source Converter: Simulation and Experimental Results

no code implementations15 Sep 2023 wei he, Jiachen Yan, Romeo Ortega, Daniele Zonetti, Wangping Zhou

In [1] a new adaptive phase-locked loop scheme for synchronization of a grid connected voltage source converter with guaranteed (almost) global stability properties was reported.

On-line Parameter Estimation of the Polarization Curve of a Fuel Cell with Guaranteed Convergence Properties: Theoretical and Experimental Results

no code implementations12 Aug 2023 Carlo Beltran, Alexey Bobtsov, Romeo Ortega, Diego Langarica-Cordoba, Rafael Cisneros, Luis H. Diaz-Saldierna

In this paper, we address the problem of online parameter estimation of a Proton Exchange Membrane Fuel Cell (PEMFC) polarization curve, that is the static relation between the voltage and the current of the PEMFC.

Fault Detection

Synthesis of an adaptive observer of state variables for a linear stationary object in the presence of measurement noise

no code implementations24 May 2023 Alexey Bobtsov, Vladimir Virobyev, Nikolay Nikolaev, Anton Pyrkin, Romeo Ortega

It is also assumed that there is no a priori information about the disturbance or noise in the measurement channel (for example, frequency spectrum, covariance, etc.).

Output Voltage Regulation of a Fuel Cell/Boost Converter System: A PI-PBC Approach

no code implementations17 Feb 2023 Rafael Cisneros, Romeo Ortega, Carlo A. Beltrán, Diego Langarica-Córdoba, Luis H. Díaz-Saldierna

We show that, in spite of the inherent nonlinearities in the current-voltage behaviour of the fuel cell, the voltage of a fuel cell/boost converter system can be regulated with a simple proportional-integral (PI) action designed following the {Passivity-based Control (PBC) approach.

A Globally Convergent Estimator of the Parameters of the Classical Model of a Continuous Stirred Tank Reactor

no code implementations11 Feb 2023 Anton Pyrkin, Alexey Bobtsov, Romeo Ortega, Jose Guadalupe Romero, Denis Dochain

In this paper we provide the first solution to the challenging problem of designing a globally exponentially convergent estimator for the parameters of the standard model of a continuous stirred tank reactor.

regression

A high performance globally exponentially stable sensorless observer for the IPMSM: Theoretical and experimental results

no code implementations1 Oct 2022 Bowen Yi, Romeo Ortega, Jongwon Choi, Kwanghee Nam

In a recent paper [18] the authors proposed the first solution to the problem of designing a {\em globally exponentially stable} (GES) flux observer for the interior permanent magnet synchronous motor.

regression

On-line Identification of Photovoltaic Arrays' Dynamic Model Parameters

no code implementations15 Sep 2022 Alexey Bobtsov, Fernando Mancilla-David, Stanislav Aranovskiy, Romeo Ortega

While there are many results of identification of the parameters of the latter model, to the best of our knowledge, no one has provided a solution for the aforementioned more complex dynamic model since it concerns the parameter estimation of a nonlinear, underexcited system with unmeasurable state variables.

An Observer-Based Composite Identifier for Online Estimation of the Thevenin Equivalent Parameters of a Power System

no code implementations14 Mar 2022 Daniele Zonetti, Romeo Ortega, Rafael Cisneros, Alexey Bobtsov, Fernando Mancilla-David, Oriol Gomis-Bellmunt

We consider a Th\'evenin equivalent circuit capturing the dynamics of a power grid as seen from the point of common coupling with a power electronic converter, and provide a solution to the problem of online identification of the corresponding circuit parameters.

Indirect Adaptive Control of Nonlinearly Parameterized Nonlinear Dissipative Systems

no code implementations15 Jan 2022 Romeo Ortega, Rafael Cisneros, Lei Wang, Arjan van der Schaft

In this note we address the problem of indirect adaptive (regulation or tracking) control of nonlinear, input affine dissipative systems.

An Almost Globally Stable Adaptive Phase-Locked Loop for Synchronization of a Grid-Connected Voltage Source Converter

no code implementations14 Jan 2022 Daniele Zonetti, Alexey Bobtsov, Romeo Ortega, Nikolay Nikolaev, Oriol Gomis-Bellmunt

In this paper we are interested in the problem of adaptive synchronization of a voltage source converter with a possibly weak grid with unknown angle and frequency, but knowledge of its parameters.

On-line Estimation of the Parameters of the Windmill Power Coefficient

no code implementations19 Dec 2021 Alexey Bobtsov, Romeo Ortega, Stanislav Aranovskiy, Rafael Cisneros

Wind turbines are often controlled to harvest the maximum power from the wind, which corresponds to the operation at the top of the bell-shaped power coefficient graph.

An Adaptive Observer for Uncertain Linear Time-Varying Systems with Unknown Additive Perturbations

no code implementations10 Dec 2021 Anton Pyrkin, Alexey Bobtsov, Romeo Ortega, Alberto Isidori

In this paper we are interested in the problem of adaptive state observation of linear time-varying (LTV) systems where the system and the input matrices depend on unknown time-varying parameters.

Persistent Excitation is Unnecessary for On-line Exponential Parameter Estimation: A New Algorithm that Overcomes this Obstacle

no code implementations16 Jun 2021 Marina Korotina, Jose Guadalupe Romero, Stanislav Aranovskiy, Alexey Bobtsov, Romeo Ortega

In this paper, we prove that it is possible to estimate online the parameters of a classical vector linear regression equation $ Y=\Omega \theta$, where $ Y \in \mathbb{R}^n,\;\Omega \in \mathbb{R}^{n \times q}$ are bounded, measurable signals and $\theta \in \mathbb{R}^q$ is a constant vector of unknown parameters, even when the regressor $\Omega$ is not persistently exciting.

PID passivity-based droop control of power converters: Large-signal stability, robustness and performance

no code implementations13 Jan 2021 Daniele Zonetti, Gilbert Bergna-Diaz, Romeo Ortega, Nima Monshizadeh

We present a full review of PID passivity-based controllers (PBC) applied to power electronic converters, discussing limitations, unprecedented merits and potential improvements in terms of large-signal stability, robustness and performance.

Conditions for Convergence of Dynamic Regressor Extension and Mixing Parameter Estimator Using LTI Filters

no code implementations30 Jul 2020 Bowen Yi, Romeo Ortega

Regarding PE we prove that, under some mild technical assumptions, if $\phi(t)$ is PE then the scalar regressor of DREM, $\Delta(t) \in \mathbb{R}$, is also PE, ensuring exponential convergence.

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