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Reduced-order models for wind generators suitable for dynamic simulation of electrical energy systems

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Abstract:
For this diploma thesis, reduced-order models for wind generators suitable for dynamic simulation of electrical energy systems have been developed. The main purpose is to keep voltage stability, which is the ability of a power system to maintain steady acceptable voltages at all buses in the system under normal operating conditions and after being subjected to a disturbance. The simulated disturbances are the wind deviations and symmetric three-phase faults in the grid. The developed wind turbine models include the following electromechanical components: the generator, possible power electronics, main control systems and a two-mass shaft system. Specifically, the examined wind turbine models can be divided into: • First type: It is referred to as a fixed-speed turbine, which uses a squirrel cage induction generator, directly coupled to the grid. • Second type: It is a variable-speed wind turbine, which uses a doubly-fed induction generator. The stator winding is coupled to the grid, and the rotor winding to a power electronics converter. For the variable-speed operation, rotor speed, pitch angle and terminal voltage controllers are used. • Third type: It is a variable-speed wind turbine, called direct-drive turbine. It uses a multipole synchronous ring generator and the same controllers as the second type one. The stator is not coupled directly to the grid but to a power electronics converter.

Type of Seminar:
IfA Seminar
Speaker:
Kostas B.Margellos
Dept of electrical and computer engineering, University of Patras
Date/Time:
Nov 01, 2007   14:00
Location:

ETL K 25
Contact Person:

Prof. John Lygeros
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Biographical Sketch:
At present, I am working on my diploma thesis in the field of developing reduced order models for wind generators suitable for dynamic simulation of electrical energy systems, under the supervision of the professor G.Giannakopoulos, and I am about to graduate in the academic year 2007-2008.