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Abstract

In wind power stations, induction machines are used as induction generators. Transient stability analysis of induction generator used in wind power station, joint to infinite bus, before and after balanced and unbalanced short circuit faults is one of the main issue in power system security and operation. It is necessary to know the transient behavior of induction generator, when joint to network, in usual faults. In this paper, active power, torque and speed of induction generator at balanced and unbalanced short circuit faults with dynamic equation of induction machine are studied. With single equation of induction machine, transient active power, torque and speed are measured. Induction generators used in wind power system before and after three phase fault, two phase fault, single phase fault and two phase to earth fault conditions are analysed. The natural approximation to derive analytical formulas for transient conditions is proposed, and the transient behavior of induction generator is analyzed by the single equations. This paper includes three parts: modeling, simulation and analysis of results.