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Power quality of wind turbine generating systems and their interaction with the grid

Exploitable results

The interaction between wind turbine generators and electricity grids was studied in terms of overall system quality and reliability. Data measurements were taken on various types of rural grids, including wind farms in areas of high resource and complex terrain. The usefulness of existing analysis packages as prediction tools was appraised by comparison with real data. The results permit the prediction and subsequent measurement of the interactions of wind turbines with grids of varying stiffness, and should aid the integration of renewable energy sources within electrical networks. The introduction of wind turbines onto electrical networks can potentially reduce power quality to unacceptable levels. Unlike other power plant, wind turbine generating systems (WTGSs) cannot respond to consumer demand but are controlled by the nature of the wind, which is highly variable. Thus, the standard definitions of power quality for electrical power plant do not necessarily apply to WTGSs. Problems can arise even on strong grids when large numbers of turbines are clustered closely together. The introduction of new generation variable-speed turbines, having frequency conversion electronics, poses even greater problems. This project focused on the interaction between wind turbine generating systems and electrical grids. Turbines may be in the form of farms, clusters or isolated machines, whilst the grid can vary in "stiffness" from a strong network to an isolated system.