325 citations · 841 across the 67 of their papers we have counts for
75 papers
On-line Parameter Estimation of the Polarization Curve of a Fuel Cell with Guaranteed Convergence Properties: Theoretical and Experimental Results
Carlo Beltran, Alexey Bobtsov, Romeo Ortega +3
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 vol…
Synthesis of an adaptive observer of state variables for a linear stationary object in the presence of measurement noise
Alexey Bobtsov, Vladimir Virobyev, Nikolay Nikolaev +2
The article is devoted to the problem of synthesis of observers of state variables for linear stationary objects operating under conditions of noise or disturbances in the measurem…
Output Voltage Regulation of a Fuel Cell/Boost Converter System: A PI-PBC Approach
Rafael Cisneros, Romeo Ortega, Carlo A. Beltrán +2
In this paper we consider the problem of voltage regulation of a proton exchange membrane fuel cell connected to an uncertain load through a boost converter. We show that, in spite…
A Globally Convergent Estimator of the Parameters of the Classical Model of a Continuous Stirred Tank Reactor
Anton Pyrkin, Alexey Bobtsov, Romeo Ortega +2
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 cont…
Parameter Estimation of Two Classes of Nonlinear Systems with Non-separable Nonlinear Parameterizations
Romeo Ortega, Alexey Bobtsov, Ramon Costa-Castello +1
In this paper we address the challenging problem of designing globally convergent estimators for the parameters of nonlinear systems containing a non-separable exponential nonlinea…
A high performance globally exponentially stable sensorless observer for the IPMSM: Theoretical and experimental results
Bowen Yi, Romeo Ortega, Jongwon Choi +1
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 magn…
On-line Identification of Photovoltaic Arrays' Dynamic Model Parameters
Alexey Bobtsov, Fernando Mancilla-David, Stanislav Aranovskiy +1
This paper deals with the problem of on-line identification of the parameters of a realistic dynamical model of a photovoltaic array connected to a power system through a power con…
A New Least Squares Parameter Estimator for Nonlinear Regression Equations with Relaxed Excitation Conditions and Forgetting Factor
Romeo Ortega, Jose Guadalupe Romero, Stanislav Aranovskiy
In this note a new high performance least squares parameter estimator is proposed. The main features of the estimator are: (i) global exponential convergence is guaranteed for all…
Adaptive state observer for linear time-varying system with partially unknown parameters of the state matrix and the input vector
Alexey Bobtsov, Nikolay Nikolaev, Romeo Ortega +2
The article deals with the problem of synthesis of an adaptive observer of state variables of a linear time-varying SISO dynamic system. It is assumed that the control signal and t…
An Observer-Based Composite Identifier for Online Estimation of the Thevenin Equivalent Parameters of a Power System
Daniele Zonetti, Romeo Ortega, Rafael Cisneros +3
We consider a Thévenin 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…
Indirect Adaptive Control of Nonlinearly Parameterized Nonlinear Dissipative Systems
Romeo Ortega, Rafael Cisneros, Lei Wang +1
In this note we address the problem of indirect adaptive (regulation or tracking) control of nonlinear, input affine dissipative systems. It is assumed that the supply rate, the st…
An Almost Globally Stable Adaptive Phase-Locked Loop for Synchronization of a Grid-Connected Voltage Source Converter
Daniele Zonetti, Alexey Bobtsov, Romeo Ortega +2
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 o…
On-line Estimation of the Parameters of the Windmill Power Coefficient
Alexey Bobtsov, Romeo Ortega, Stanislav Aranovskiy +1
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. Such a mode…
An Adaptive Observer for Uncertain Linear Time-Varying Systems with Unknown Additive Perturbations
Anton Pyrkin, Alexey Bobtsov, Romeo Ortega +1
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-var…
State Observation of Affine-in-the-States Systems with Unknown Time-Varying Parameters and Output Delay
Alexey Bobtsov, Nikolay Nikolaev, Romeo Ortega +2
In this paper we address the problem of adaptive state observation of affine-inthe-states time-varying systems with delayed measurements and unknown parameters. The development of…
Observability is Sufficient for the Design of Globally Exponentially Convergent State Observers for State-affine Nonlinear Systems
Lei Wang, Romeo Ortega, Alexei Bobtsov
In this paper we are interested in the problem of state observation of state-affine nonlinear systems. Our main contribution is to propose a globally exponentially convergent obser…
Identifiability Implies Robust, Globally Exponentially Convergent On-line Parameter Estimation: Application to Model Reference Adaptive Control
Lei Wang, Romeo Ortega, Alexey Bobtsov +2
In this paper we propose a new parameter estimator that ensures global exponential convergence of linear regression models requiring only the necessary assumption of identifiabilit…
Persistent Excitation is Unnecessary for On-line Exponential Parameter Estimation: A New Algorithm that Overcomes this Obstacle
Marina Korotina, Jose Guadalupe Romero, Stanislav Aranovskiy +2
In this paper, we prove that it is possible to estimate online the parameters of a classical vector linear regression equation , where $ Y \in \mathbb{R}^n,\;Ω\in \mathbb{R}…
Parameter Estimation and Adaptive Control of Euler-Lagrange Systems Using the Power Balance Equation Parameterization
Jose Guadalupe Romero, Romeo Ortega, Alexey Bobtsov
It is widely recognized that the existing parameter estimators and adaptive controllers for robot manipulators are extremely complicated to be of practical use. This is mainly due…
Generation of new exciting regressors for consistent on-line estimation of unknown constant parameters
Alexey Bobtsov, Bowen Yi, Romeo Ortega +1
The problem of parameter estimation from a standard vector linear regression equation in the absence of sufficient excitation in the regressor is addressed. The first step to solve…
PID passivity-based droop control of power converters: Large-signal stability, robustness and performance
Daniele Zonetti, Gilbert Bergna-Diaz, Romeo Ortega +1
We present a full review of PID passivity-based controllers (PBC) applied to power electronic converters, discussing limitations, unprecedented merits and potential improvements in…
Parameter Identification with Finite-Convergence Time Alertness Preservation
Romeo Ortega, Alexey Bobtsov, Nikolay Nikolaev
In this brief note we present two new parameter identifiers whose estimates converge in finite time under weak interval excitation assumptions. The main novelty is that, in contras…
A Flux and Speed Observer for Induction Motors with Unknown Rotor Resistance and Load Torque and no Persistent Excitation Requirement
Anton Pyrkin, Alexey Bobtsov, Alexey Vedyakov +3
In this paper we address the problems of flux and speed observer design for voltage-fed induction motors with unknown rotor resistance and load torque. The only measured signals ar…
State Observation of LTV Systems with Delayed Measurements: A Parameter Estimation-based Approach
Alexey Bobtsov, Nikolay Nikolaev, Romeo Ortega +1
In this paper we address the problem of state observation of linear time-varying systems with delayed measurements, which has attracted the attention of many researchers|see [7] an…