325 citations · 841 across the 67 of their papers we have counts for
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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…