Crina Vlad

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This paper presents the results of experimental investigation of a low-power wind energy conversion system (WECS), based on a permanent-magnet synchronous generator (PMSG) connected directly to the turbine. A development system was built in order to carry out the experiments. Its detailed description is also provided. The development system can work as an(More)
Cooperating autonomous agents are becoming increasingly attractive for systems where problem solving and decision making must be decentralized. So far, work in this area has focused either on theoretical aspects or on implementation of ad-hoc specialized applications, but neither has led to significant result in the industrial field. One reason for this is(More)
In recent years, Modular Multilevel Converters (MMCs) have received an increasing attention, because they are seen as a viable solution for high power applications. An MMC is characterized by a modular arm structure, composed of a cascade connection of a large number of simple dc/dc cells with floating capacitors. These cells can be easily assembled into a(More)
This paper analyzes the variability of the linearized model of a Horizontal Axis Wind Turbine (HAWT) system that operates around the optimal regimes characteristic (ORC). Based on the obtained results, a gain scheduling control structure is proposed for rotational speed tracking in order to ensure maximum power conversion. The proposed control law(More)
The paper deals with the robust control of the dissolved oxygen concentration in the case of wastewater treatment processes. The Gain Scheduling control method has been chosen for the dissolved oxygen concentration control. Firstly the dissolved oxygen control loop was experimental identified in various operating points. The Gain Scheduling strategy was(More)
In this paper a hierarchical control structure appropriated to recirculating aquaculture processes is proposed. The control software consists in two levels. The first level is the low level and deals with the basic control functions of the process such as: the control of the dissolved oxygen concentration and the temperature monitoring in the aquaculture(More)
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