Investigation And Analysis Of Ashegoda Wind Farm Integration Impact On Ethiopian Grid

Ethiopian electric power corporation is under implementation stage to integrate windrnpower to exiting grid system which contains mainly hydro generators.rnIntegration of wind power plant with grid system has many challenges that need to bernstudied thoroughly to identify major problems. The major problems induced by the windrnfarm depend on level of penetration.rnIn this thesis work operational impacts associated with “Ashegoda Wind Farm (AWF)”rnintegration has been studied, mainly variability, predictability and steady state stabilityrnimpacts. The variability and predictability impacts have been studied using statisticalrnmethod on the basis of data supplied from wind project office of “Ethiopian Electric PowerrnCorporations”.rnAshegoda wind farm increases the variability of the system load characteristics in case ofrnhourly and thirty minute load. As per the result of the stability study, there is a steady staternvoltage stability impact under contingency cases. However, in base case, there is no anyrnstability impact. Along with the stability analysis, one of possible solutions, that is,rnmanaging the transmission line capacity have been suggested and discussed.rnIn addition to variability impact, predictability impact also studied by developing a windrnpower forecasting model. Different models have been developed and the one with bestrnforecast accuracy selected on the basis of MAE and compared with persistence modelrnconsidering as a base model.rnKey words: integration,Variability, forecasting, stability, modeling, frequency distribution,rnVariable speed, Ancillary service.

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