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The Control of Large Wind-Farm-Induced Voltage Fluctuations

A major problem encountered in the use of large amounts of wind for the production of electric energy is the variability of the electric power produced by the turbine. Also, the literature contains several papers which address potential dynamic impacts of large wind farms on interconnected utility systems in terms of, for example, stability [1, 2, 3] However, there is no current research on the effects of potentially large power fluctuations on the utility voltage profile This paper represents an initial investigation on potential voltage fluctua¬ tion problems caused by large wind farms and possible control strategies to minimize these fluctuations. The control strategies involve the use of a special ac/dc/ac interface, shown in Fig. 1, which has been designed [4] to control, among other things, this potentially severe disturbance. The control is convenient, economical, and effective A simula¬ tion algorithm was synthesized to capture the quasi-steadystate time-varying nature of the aggregate wind/utility sys¬ tem and to facilitate demonstration of the problem and its potential solution The problem is illustrated on the WSCC 9bus test system which is in character typical of the small isolated utilities likely to benefit from the use of wind as an energy source. A wind power injection model is developed in the paper and is excited by wind data synthesized by the techniques of [5] from actual data supplied by the Rocky Flats test site