325 citations · 841 across the 67 of their papers we have counts for
11 papers · 1 filter
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…
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…
Generalized Parameter Estimation-based Observers: Application to Power Systems and Chemical-Biological Reactors
Romeo Ortega, Alexey Bobtsov, Nikolay Nikolaev +2
In this paper we propose a new state observer design technique for nonlinear systems. It consists of an extension of the recently introduced parameter estimation-based observer, wh…
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…