Search Results for author: Rafael Cisneros

Found 7 papers, 1 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.

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

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.

Learning Bipedal Walking On Planned Footsteps For Humanoid Robots

1 code implementation26 Jul 2022 Rohan Pratap Singh, Mehdi Benallegue, Mitsuharu Morisawa, Rafael Cisneros, Fumio Kanehiro

To enable the application of RL policies for humanoid robots in real-world settings, it is crucial to build a system that can achieve robust walking in any direction, on 2D and 3D terrains, and be controllable by a user-command.

Reinforcement Learning (RL)

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.

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.

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