engleski

Modelling and fault analysis of different wind generator technologies

There are number of technical challenges associated with operation of isolated systems, especially once with renewable energy sources. Varying loads and climate conditions can cause disturbances in the system, like frequency and voltage variances. It is thus important to develop adequate control and operational procedures of such systems. Important step in definition of control and operational procedures for any power system is short circuit analysis. It should be performed in order to obtain the magnitude of fault currents, which is used for grid elements dimensioning and protection adjustments. Results depend, of course, on grid topology, location of the fault and the type of the fault. Short reminder about short circuit theory will be presented in this paper. However, the first and the most important step in short-circuit analysis is to develop grid equivalent model and to determine overall impedance of the fault circuit. That means that every grid element should be presented with equivalent model, i.e. equivalent circuit. In systems with renewable energy sources it is interesting to consider and analyse different types of power sources and to develop their equivalent models. This paper will address different wind generators technologies and their modelling issues, since wind generator technologies differ significantly from generators used in conventional power plants. Both, contribution of different generation units to the fault currents and behaviour of generating units during disturbances in the grid will be discussed in this paper. The contribution of wind generators to the fault current and behaviour under fault conditions differ between three main wind aggregates types.

wind generator; short-circuit

nije evidentirano