Modeling and analysis of variable speed wind generators connected on the electrical power systems.

Author(s)

Maurício Barbosa de Camargo Salles

• Document type: Doctoral Thesis
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Escola Politécnica (EP/BC)
• Defense date: 2009-10-02

Examining board members

José Roberto Cardoso; Edwin Avolio; Walmir de Freitas Filho; Diógenes Pereira Gonzaga; Pedro Pereira de Paula

• Advisor: José Roberto Cardoso; Walmir de Freitas Filho

Abstract

The development of computational models of wind turbines equipped with different electrical machines is presented in this thesis, emphasizing the doubly fed induction generator. Such models were developed to investigate the performance of different control strategies as well as different protection system of the back-to-back converters. Additionally, this thesis present an original analytic method to investigate the stability of doubly fed induction generators during large disturbance on the electric system. The methodology is validated by comparing results from the developed dynamic models to the results from the analytical equations. For the dynamic models, the obtained results by simulations show that the chosen of the appropriate control strategies and the protection system can permit more reactive power injection during short circuits in the network. The proposed analytic method is sufficiently precise to analyze large disturbance stability reducing the necessary effort spending on dynamic simulation without the need of buying a specific license to run the software. (AU)