https://pure.rug.nl/ws/files/14408405/2002AutomaticaOrtega.pdf

Interconnection and damping assignment passivity-based control of port-controlled Hamiltonian systems

This paper presents a review of recently used direct torque and flux control (DTC) techniques for voltage inverter-fed induction and permanent-magnet synchronous motors. A variety of techniques, different in concept, are described as follows: switching-table-based hysteresis DTC, direct self control, constant-switching-frequency DTC with space-vector modulation (DTC-SVM). Also, trends in the DTC-SVM techniques based on neuro-fuzzy logic controllers are presented. Some oscillograms that illustrate properties of the presented techniques are shown.

Direct torque control of PWM inverter-fed AC motors - a survey

Energy is one of the fundamental concepts in science and engineering practice, where it is common to view dynamical systems as energy-transformation devices. This perspective is particularly useful in studying complex nonlinear systems by decomposing them into simpler subsystems that, upon interconnection, add up their energies to determine the full system's behavior. The action of a controller may also be understood in energy terms as another dynamical system. The control problem can then be recast as finding a dynamical system and an interconnection pattern such that the overall energy function takes the desired form. This energy-shaping approach is the essence of passivity-based control (PBC), a controller design technique that is very well known in mechanical systems. Our objectives in the article are threefold. First, to call attention to the fact that PBC does not rely on some particular structural properties of mechanical systems, but hinges on the more fundamental (and universal) property of energy balancing. Second, to identify the physical obstacles that hamper the use of standard PBC in applications other than mechanical systems. In particular, we show that standard PBC is stymied by the presence of unbounded energy dissipation, hence it is applicable only to systems that are stabilizable with passive controllers. Third, to revisit a PBC theory that has been developed to overcome the dissipation obstacle as well as to make the incorporation of process prior knowledge more systematic. These two important features allow us to design energy-based controllers for a wide range of physical systems.

/pdf/putting-energy-back-in-control-1b6hr2kss0.pdf

Putting energy back in control

We consider the application of a formulation of passivity-based control (PBC), known as interconnection and damping assignment (IDA) to the problem of stabilization of underactuated mechanical systems, which requires the modification of both the potential and the kinetic energies. Our main contribution is the characterization of a class of systems for which IDA-PBC yields a smooth asymptotically stabilizing controller with a guaranteed domain of attraction. The class is given in terms of solvability of certain partial differential equations. One important feature of IDA-PBC, stemming from its Hamiltonian formulation, is that it provides new degrees of freedom for the solution of these equations. Using this additional freedom, we are able to show that the method of "controlled Lagrangians"-in its original formulation-may be viewed as a special case of our approach. As illustrations we design asymptotically stabilizing IDA-PBCs for the classical ball and beam system and a novel inertia wheel pendulum.

Stabilization of a class of underactuated mechanical systems via interconnection and damping assignment

Brief paper: Distributed finite-time attitude containment control for multiple rigid bodies

/pdf/passivity-based-control-of-euler-lagrange-systems-215bq46ma0.pdf

Passivity-based Control of Euler-Lagrange Systems

Spacecraft formation flying: A review and new results on state feedback control

In this brief, a tracking controller is presented to stabilize the attitude of a micro satellite via integrator backstepping and quaternion feedback. The controller is shown to render the equilibrium points in the closed-loop system uniformly asymptotically stable. Simulations are performed using satellite parameters from the ESEO mission under the European Space Agency's SSETI project.

Per Johan Nicklasson

Papers

Passivity-based Control of Euler-Lagrange Systems

Spacecraft formation flying: A review and new results on state feedback control

Satellite Attitude Control by Quaternion-Based Backstepping

Brief paper: Spacecraft coordination control in 6DOF: Integrator backstepping vs passivity-based control

On speed control of induction motors