Investigation and Analysis of Ashegoda Wind Farm Integration Impact on Ethiopian Grid
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Date
2010-10
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Addis Ababa University
Abstract
Ethiopian electric power corporation is under implementation stage to integrate wind power to exiting grid system which contains mainly hydro generators. Integration of wind power plant with grid system has many challenges that need to be studied thoroughly to identify major problems. The major problems induced by the wind farm depend on level of penetration. In this thesis work operational impacts associated with “Ashegoda Wind Farm (AWF)” integration has been studied, mainly variability, predictability and steady state stability impacts. The variability and predictability impacts have been studied using statistical method on the basis of data supplied from wind project office of “Ethiopian Electric Power Corporations”. Ashegoda wind farm increases the variability of the system load characteristics in case of hourly and thirty minute load. As per the result of the stability study, there is a steady state voltage stability impact under contingency cases. However, in base case, there is no any stability impact. Along with the stability analysis, one of possible solutions, that is, managing the transmission line capacity have been suggested and discussed. In addition to variability impact, predictability impact also studied by developing a wind power forecasting model. Different models have been developed and the one with best forecast accuracy selected on the basis of MAE and compared with persistence model considering as a base model.
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Keywords
Integration, Variability, Forecasting, Stability, Modeling, Frequency Distribution, Variable Speed, Ancillary Service