On modified parameter estimators for identification and adaptive control. A unified framework and some new schemes

R Ortega, V Nikiforov, D Gerasimov - Annual Reviews in Control, 2020 - Elsevier
A key assumption in the development of system identification and adaptive control schemes
is the availability of a regression model which is linear in the unknown parameters (of the …

[HTML][HTML] Data-driven simultaneous identification of the 6DOF dynamic model and wave load for a ship in waves

Z Ren, X Han, X Yu, R Skjetne, BJ Leira… - … Systems and Signal …, 2023 - Elsevier
In marine operations, the performance of model-based automatic control design and
decision support systems highly relies on the accuracy of the representative mathematical …

A reduced-order adaptive state observer for DC–DC converters with unknown constant power load

W He, X Wang, MM Namazi, W Zhou… - Control Engineering …, 2024 - Elsevier
In this paper, main objective is to develop a reduced-order adaptive state observer (RASO)
for a large class of DC–DC converters with constant power load (CPL) to estimate their …

New results on parameter estimation via dynamic regressor extension and mixing: Continuous and discrete-time cases

R Ortega, S Aranovskiy, AA Pyrkin… - … on Automatic Control, 2020 - ieeexplore.ieee.org
We present some new results on the dynamic regressor extension and mixing parameter
estimators for linear regression models recently proposed in the literature. This technique …

Online estimation of power system inertia using dynamic regressor extension and mixing

J Schiffer, P Aristidou, R Ortega - IEEE Transactions on Power …, 2019 - ieeexplore.ieee.org
The increasing penetration of power-electronic-interfaced devices is expected to have a
significant effect on the overall system inertia and a crucial impact on the system dynamics …

Generalized parameter estimation-based observers: Application to power systems and chemical–biological reactors

R Ortega, A Bobtsov, N Nikolaev, J Schiffer, D Dochain - Automatica, 2021 - Elsevier
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 …

On preserving-excitation properties of kreisselmeier's regressor extension scheme

S Aranovskiy, R Ushirobira, M Korotina… - IEEE Transactions on …, 2022 - ieeexplore.ieee.org
In this article, we consider the excitation preservation problem of Kreisselmeier's regressor
extension scheme. We analyze this problem within the context of the dynamic regressor …

Conditions for convergence of dynamic regressor extension and mixing parameter estimators using LTI filters

B Yi, R Ortega - IEEE Transactions on Automatic Control, 2022 - ieeexplore.ieee.org
In this article, we study the conditions for convergence of the recently introduced dynamic
regressor extension and mixing (DREM) parameter estimator when the extended regressor …

Adaptive control of linear multivariable systems using dynamic regressor extension and mixing estimators: Removing the high-frequency gain assumptions

R Ortega, DN Gerasimov, NE Barabanov, VO Nikiforov - Automatica, 2019 - Elsevier
In this paper it is shown that, using the recently introduced dynamic regressor extension and
mixing parameter estimation technique, it is possible to remove the key assumption of prior …

Modeling, simulation and experimental validation of flow rate of electro-hydraulic hitch control valve of agricultural tractor

S Kumar, VK Tewari, CK Bharti, A Ranjan - Flow Measurement and …, 2021 - Elsevier
Advances in non-linear control theory have made it possible to develop controllers for non-
linear dynamic systems in their nature. The low-cost proportional control valves of the …