Modelling wind farms for power system simulations

Abstract:

As a result of increasing wind farms penetration in power systems, the wind farms begin to influence power system, and thus the modelling of wind farms has become an interesting research topic. Modelling of wind farms depends on the purpose of investigations to be performed. For investigations of the internal behaviour of wind turbines within a wind farm, it is required the wind farms to be modelled by a complex detailed model, which includes the modelling of all the wind turbines and the wind farm electrical network. It can be also used to represent the collective response of a wind farm during transient stability studies of large scale power systems. However, if a wind farm with large number of wind turbines is modelled, the wind farm presents a high order, and therefore the simulation requires relatively large computation time. To reduce the complexity of the wind farm model during simulations of a large power system, simplified aggregated models of wind farms have been developed for the simulation of the collective response of wind farms on large power systems. Various approaches can be used for aggregating wind turbines. One of the most used equivalent models of wind farms is based on aggregating wind turbines experiencing identical incoming winds into an aggregated wind turbine. However, this aggregation method can not be applied to wind farms with wind turbines experiencing different winds. In such a case, the aggregated model require a dynamic simplified model of each individual wind turbine, which calculates the torque/power according to the incoming wind, and the aggregated torque/power is applied to an equivalent generation system. This aggregation method enables an accurate approximation of the collective response of the complete wind farm for power systems simulations, with an important reduction model order and the computation time. In this chapter, an overview of the wind farm models for power system dynamic simulations is performed, the models are described and their application in power system simulations are discussed. © 2010 by Nova Science Publishers, Inc. All rights reserved.

Año de publicación:

2011

Keywords:

• power system
• Wind farm
• Induction generator
• modelling
• Wind turbine

Fuente:

scopus