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This work analyzes the performance of a dual stator-winding induction generator based wind turbine during grid faults. The simulated and experimental results can be used to improve the transient response during these faults, as well as being a reference frame of low-voltage ride-through capability enhancement for this type of induction generator.
This paper uses an easy technique to calculate directly the parameters for induction motors, using single- and double-cage models. This technique has been applied in a wide sample of 2167 induction motors, where the parameters have been calculated from manufacturer data. The results show that this technique provides large errors in the start and maximum torque points, but on the other hand, it provides...
Urban integration of wind generators demands direct injection of the energy produced to the grid. Battery-based electrical storage is usually expensive in terms of direct cost, space, and maintenance. Direct grid-injection implies AC-AC conversion where the input source, a synchronous alternator, has a variable output voltage and frequency. This conversion is usually realized with two converters....
This paper proposes and implements a modified topology of dual stator winding induction generator with standard squirrel cage rotor. The induction generator design includes a two-dimensional finite elements analysis to investigate the magnetic field distribution. A DWIG prototype is developed and tested to verify the validity of this machine design as variable speed wind generator. The proposed design...
A battery-supplied, DC-HID lamp ballast, inspired on the Loss Free Resistor (LFR) concept is presented here. It consists of two stages. The first one, a boost converter, behaves like a constant power source. The second one, a switched capacitor boost converter is the ignitor circuit. The cascade connection of both converters results in a transformerless ballast able to reach a voltage of 6 kV from...
In this work, we present an electronic system that simplify the incorporation of additional sources to a previously existent small PV system. Particularly, we investigate how to proceed with a low voltage, high-current PEM fuel-cell. The proposed system is developed from the concept of loss-free resistor, and can be easily adapted to any type of energy source and storage elements. Among the advantages...
An analysis and design of an asymmetrical full-bridge multilevel converter in sliding-mode operation for inverter applications in small power systems are presented. A five-level sinusoidal current source inverter is proposed with the lowest number of controllable devices and the simplest control electronics. The current source nature of the inverter is achieved by means of a sliding-mode control loop...
This paper proposes a system, based on a self- excited induction generator with a shunt electronic converter, to feed isolated three-phase and single-phase linear or nonlinear loads. The electronic converter is composed by a three-phase four-wire voltage source inverter (VSI) and, connected to its dc side, two dc/dc converters. The VSI compensates the current harmonics, the reactive power and the...
This work proposes a system, based on a self-excited induction generator (SEIG) with a shunt electronic converter, to feed isolated three-phase and single-phase linear or nonlinear loads. The electronic converter is composed by a three-phase four-wire shunt active filter and a DC chopper attached to its DC bus. The converter compensates the current harmonics, the reactive power and the load unbalances...
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