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The paper contribute to establish pragmatic methods to obtain modeling, identification and control laws of double stator windings induction generator DSWIG. The DSWIG model is obtained by formally juxtaposing/over lapping two induction machines, mechanically and magnetically identical to the real DSWIG machine, and having as stator winding the DSWIG load winding, one of them, and the second one having,...
The paper establishes a preliminary pragmatic method to obtain the control strategy of an innovative small windgenerator prototype. There is presented the proposed structure of the considered wind energy conversion system, respectively its components and subsystems. There were considered the wind turbine, the generator, the electronic converters, the brake systems and their characteristics, being...
The paper presents a study for determination the optimal control law for a small horizontal axis windgenerator. Experimentally, using a mixed physical-analog laboratory model, were determined the state variables, corresponding to different wind speed values, for the optimum regimes of the wind turbine, based on the turbine theoretical estimated mathematical model. From a large multitude of possible...
The paper presents a control strategy for a wind energy conversion system (WECS) which tracks the maximum power point of the wind turbine. The topology of the system consists of a permanent magnet synchronous generator (PMSG), a diode bridge rectifier, a hybrid dc-dc converter which lowers the dc voltage, a supercapacitor and a battery charger. This strategy uses the measured wind speed and imposes...
The paper proposes an innovative single-phase synchronous generator - a particular case of new generators' stator windings configurations. Electric structures of these configurations are considered, in the case of constant or variable speed squirrel cage and permanent magnet rotor of the three phase machines with single-phase output. The paper is focused on the study of the two stator windings permanent...
The paper proposes a new, high gain, power conversion system and an innovative speed-control strategy dedicated to optimize the efficiency and the delivered electric energy of small horizontal axis wind generators with non-regulated blades, in the frame of an European Economic Area (EEA) project, in partnership with “Politehnica” University from Timisoara.
The paper concerns a dual (double) split-wound three-phase stator windings induction generator having the same poles number (split-wound). The separate stator windings have distinct functions — excitation and, respectively, electric energy generation, that assures the physical decoupling of the excitation and of the load and their control simplification, There was considered [1] 90 electrical degrees...
This paper refers, mainly, to the problem of the current harmonics of PM synchronous generator, due to the electric conversion system rectifier, interfacing the generator and the grid, present in the structure of the variable speed windgenerators. The problem was experimentally studied on “Politehnica” University from Timisoara (UPT) laboratory test rig, based on the PM synchronous generator — “ac...
This paper considers the induction generator having two similar separate three-phase stator windings, wound for the same number of poles and a standard squirrel rotor (IG2). Here is given the mathematical model of such induction machine, which is based on our previous results, namely, the two separate stator windings must be space-displaced at 90 electrical degrees, one from the other (orthogonal...
The research was oriented to the problems of the double wound stator induction generator. Currently now, this generator is more and more considered in the technical literature, as an alternative to the synchronous generator. In the case of nonconventional generator systems, especially in the case of wind systems, the dynamic regimes of electrical generators show interest due to the random character...
The implementation complexity of classical algorithms for wind turbines control limits the utilization of low-end microcontrollers for such applications. We conceived an original method that aims to optimize the efficiency of windmills with fixed blades with the variation of the wind speed. In the paper we present an original method to determine generator's efficiency values using measurements that...
The paper discusses the optimization of low speed induction generators, directly coupled to the shaft of the turbines in variable-speed wind power generation systems. These low speed induction generators have a big number of poles and, as a consequence, low performance and big stator outer diameter. Because of the variable speed, a power electronic converter has to be used to deliver the produced...
The paper presents considerations regarding the problematic of induction generator's (IG) self excitation. There are considered the known issues, such as load loss racing, excitation reactive energy compensation, self-excitation and plant interconnection. The conducted theoretical and experimental studies permitted the establishment of technical conditions necessary for a normal operation of an IG...
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