325 citations · 841 across the 67 of their papers we have counts for
56 papers · 1 filter
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…
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…
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…
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}…
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…
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…
Conditions for Convergence of Dynamic Regressor Extension and Mixing Parameter Estimator Using LTI Filters
Bowen Yi, Romeo Ortega
In this note we study the conditions for convergence of recently introduced dynamic regressor extension and mixing (DREM) parameter estimator when the extended regressor is generat…
Distributed Observers for LTI Systems with Finite Convergence Time: A Parameter Estimation-based Approach
Romeo Ortega, Emmanuel Nuño, Alexei Bobtsov
A novel approach to solve the problem of distributed state estimation of linear time-invariant systems is proposed in this paper. It relies on the application of parameter estimati…
A Globally Convergent State Observer for Multimachine Power Systems with Lossy Lines
Alexey Bobtsov, Romeo Ortega, Nikolay Nikolaev +1
We present the first solution to the problem of estimation of the state of multimachine power systems with lossy transmission lines. We consider the classical three-dimensional \fl…
A Globally Stable Practically Implementable PI Passivity-based Controller for Switched Power Converters
Alexey Bobtsov, Romeo Ortega, Nikolay Nikolaev +1
In this paper we propose a PI passivity-based controller, applicable to a large class of switched power converters, that ensures global state regulation to a desired equilibrium po…
State Observation of Power Systems Equipped with Phasor Measurement Units: The Case of Fourth Order Flux-Decay Model
Alexey Bobtsov, Romeo Ortega, Nikolay Nikolaev +2
The problem of effective use of Phasor Measurement Units (PMUs) to enhance power systems awareness and security is a topic of key interest. The central question to solve is how to…
PMU-Based Decentralized Mixed Algebraic and Dynamic State Observation in Multi-Machine Power Systems
M. Nicolai L. Lorenz-Meyer, Alexey A. Bobtsov, Romeo Ortega +2
We propose a novel decentralized mixed algebraic and dynamic state observation method for multi-machine power systems with unknown inputs and equipped with Phasor Measurement Units…
Path following of a class of underactuated mechanical systems via immersion and invariance-based orbital stabilization
Bowen Yi, Romeo Ortega, Ian R. Manchester +1
This paper aims to provide a new problem formulation of path following for mechanical systems without time parameterization nor guidance laws, namely, we express the control object…
Voltage regulation in buck--boost coniverters feeding an unknown constant power load: an adaptive passivity-based control
Carlos A. Soriano--Rangel, Wei He, Fernando Mancilla--David +1
Rapid developments in power distribution systems and renewable energy have widened the applications of dc--dc buck--boost converters in dc voltage regulation. Applications include…