Ultimate boundedness of droop controlled Microgrids with secondary loops

In this paper we study theoretical properties of inverter-based microgrids controlled via primary and secondary loops. Stability of these microgrids has been the subject of a number of recent studies. Conventional approaches based on standard hierarchical control rely on time-scale separation between primary and secondary control loops to show local stability of equilibria. In this paper we show that (i) frequency regulation can be ensured without assuming time-scale separation and, (ii) ultimate boundedness of the trajectories starting inside a region of the state space can be guaranteed under a condition on the inverters power injection errors. The trajectory ultimate bound can be computed by simple iterations of a nonlinear mapping and provides a certificate of the overall performance of the controlled microgrid.Comment: 8 pages, 1 figur

Fault-tolerant control under controller-driven sampling using virtual actuator strategy

We present a new output feedback fault tolerant control strategy for continuous-time linear systems. The strategy combines a digital nominal controller under controller-driven (varying) sampling with virtual-actuator (VA)-based controller reconfiguration to compensate for actuator faults. In the proposed scheme, the controller controls both the plant and the sampling period, and performs controller reconfiguration by engaging in the loop the VA adapted to the diagnosed fault. The VA also operates under controller-driven sampling. Two independent objectives are considered: (a) closed-loop stability with setpoint tracking and (b) controller reconfiguration under faults. Our main contribution is to extend an existing VA-based controller reconfiguration strategy to systems under controller-driven sampling in such a way that if objective (a) is possible under controller-driven sampling (without VA) and objective (b) is possible under uniform sampling (without controller-driven sampling), then closed-loop stability and setpoint tracking will be preserved under both healthy and faulty operation for all possible sampling rate evolutions that may be selected by the controller

Adolf Reinach sur le continu

peer reviewe

La violation du tiers exclu comme critère d’intentionnalité

peer reviewe

Intentionalisme et phénoménologie de l'intentionnalité

peer reviewedThis paper presents an argument in favor of a “phenomenological” approach to intentionality. This approach, as I see it, involves the view that intentional facts are better expressed with the help of appearance words (“seems”, “appears”, “is similar to”, etc.). By contrast, what I call the “intentionalist approach” assumes that intentional facts are better expressed by intentional verbs. The argument is as follows. First, it is well-known that the use of intentional verbs to express typically intentional facts generates anomalies with respect to existential generalization, substitution of identicals, and the principle of excluded middle. Secondly, I argue that the use of appearance words does not generate the same anomalies, which suggests that appearance words are more appropriate to describe intentional facts. This, I conclude, is an argument for preferring the phenomenological to the intentionalist approach to intentionality

La critique de la psychologie de Natorp dans la Ve Recherche logique de Husserl

La présente étude vise à identifier et à clarifier quelques aspects centraux de la critique de la psychologie de Natorp dans la VeRecherche logique de Husserl. Après avoir ramené l’argumentation de Husserl à quatre objections principales, nous montrons qu’elles ont toutes pour enjeu l’idée d’une psychologie empirique de style brentanien. Nous commentons sur cette base deux questions parmi les plus significatives soulevées par la controverse Husserl-Natorp : la nature de la différence entre le psychique et le physique et la possibilité d’objectiver les contenus phénoménaux — en clarifiant en quel sens les deux auteurs y apportent des réponses diamétralement opposées. L’article s’achève par quelques remarques sur les faiblesses de la conception de Natorp.The aim of this essay is to identify and to analyze some key aspects of Husserl’s critique of Natorp’s psychology in the fifth Logical Investigation. After dividing Husserl’s argumentation into four main objections, we show that what is at stake in all of them is the idea of an empirical psychology in Brentano’s style. From that perspective we comment two of the most significant questions raised by the Husserl-Natorp debate : the nature of the difference between psychical and physical, the possibility of objectifying phenomenal contents. We then attempt to clarify in what sense Husserl’s and Natorp’s answers to these two questions are diametrically opposed. We conclude by some remarks on the intrinsic weaknesses of Natorp’s approach

Brentano's Project of Descriptive Psychology

peer reviewe

Afterward: A Comparative Look at the Status of Women in the Legal Profession

Women in Legal Practice: Global and Local Perspectives, Symposium, June 5-8, 2012. Annual Meeting of the Law and Society Association