325 citations · 841 across the 67 of their papers we have counts for
11 papers · 1 filter
Smooth, Time-invariant Regulation of Nonholonomic Systems via Energy Pumping-and-Damping
Bowen Yi, Romeo Ortega, Weidong Zhang
In this paper we propose an energy pumping-and-damping technique to regulate nonholonomic systems described by kinematic models. The controller design follows the widely popular in…
Online Estimation of Power System Inertia Using Dynamic Regressor Extension and Mixing
Johannes Schiffer, Petros Aristidou, Romeo Ortega
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…
Sensorless Control of the Levitated Ball
Alexey Bobtsov, Anton Pyrkin, Romeo Ortega +1
One of the most widely studied dynamical systems in nonlinear control theory is the levitated ball. Several full-state feedback controllers that ensure asymptotic regulation of the…
Orbital Stabilization of Nonlinear Systems via the Immersion and Invariance Technique
Romeo Ortega, Bowen Yi, Jose Guadalupe Romero +1
Immersion and Invariance is a technique for the design of stabilizing and adaptive controllers and state observers for nonlinear systems. In all these applications the problem cons…
On the Existence and Long-Term Stability of Voltage Equilibria in Power Systems with Constant Power Loads
Alexey S. Matveev, Juan E. Machado, Romeo Ortega +2
Voltage instability is a major threat in power system operation. The growing presence of constant power loads significantly aggravates this issue, hence motivating the development…
Active Damping of a DC Network with a Constant Power Load: An Adaptive Passivity-based Control Approach
Juan E. Machado, José Arocas-Pérez, Wei He +2
This paper proposes a nonlinear, adaptive controller to increase the stability margin of a direct-current (DC) small-scale electrical network containing a constant power load, whos…
On Generation of Virtual Outputs via Signal Injection: Application to Observer Design for Electromechanical Systems
Bowen Yi, Romeo Ortega, Houria Siguerdidjane +2
Probing signal injection is a well-established technique to extract additional information from a weakly (or non) observable dynamical system. Using averaging theory, a framework t…
Permanent Magnet Synchronous Motors are Globally Asymptotically Stabilizable with PI Current Control
Romeo Ortega, Nima Monshizadeh, Pooya Monshizadeh +2
This note shows that the industry standard desired equilibrium for permanent magnet synchronous motors (i.e., maximum torque per Ampere) can be globally asymptotically stabilized w…
An Adaptive Observer for Sensorless Control of the Levitated Ball Using Signal Injection
Bowen Yi, Romeo Ortega, Houria Siguerdidjane +1
In this paper we address the problem of sensorless control of the 1-DOF magnetic levitation system. Assuming that only the current and the voltage are measurable, we design an adap…
Power-Controlled Hamiltonian Systems: Application to Electrical Systems with Constant Power Loads
Pooya Monshizadeh, Juan E. Machado, Romeo Ortega +1
We study a type of port-Hamiltonian system, in which the controller or disturbance is not applied to the flow variables, but to the systems power, a scenario that appears in many p…
Robust integral action of port-Hamiltonian systems
Joel Ferguson, Alejandro Donaire, Romeo Ortega +1
Interconnection and damping assignment, passivity-based control (IDA-PBC) has proven to be a successful control technique for the stabilisation of many nonlinear systems. In this p…