no code implementations • 29 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.
no code implementations • 15 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.
no code implementations • 12 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.
no code implementations • 24 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.).
no code implementations • 17 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.
no code implementations • 11 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.
no code implementations • 1 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.
no code implementations • 15 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.
no code implementations • 14 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.
no code implementations • 15 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.
no code implementations • 14 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.
no code implementations • 19 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.
no code implementations • 10 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.
no code implementations • 21 Aug 2021 • Lei Wang, Romeo Ortega, Alexei Bobtsov
In this paper we are interested in the problem of state observation of state-affine nonlinear systems.
no code implementations • 19 Aug 2021 • Lei Wang, Romeo Ortega, Alexey Bobtsov, Jose Guadalupe Romero, Bowen Yi
The estimators are shown to be robust to additive measurement noise and--not necessarily slow--parameter variations.
no code implementations • 16 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.
no code implementations • 13 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.
no code implementations • 30 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.