Reactive Power Reserve Assessment Scheme Considering Stochastic Wind Power Generation

Abstract

Abstract This paper presents a reactive power “VAR” reserve assessment tool considering the extended capability curve of the doubly fed induction generator (DFIG) based wind farm. The problem is formulated such that the VAR reserve amount is determined taking into account the wind power forecast errors by addressing their possible scenarios for both the base case and a presumed severe disturbance. The model is stated as an optimization problem, aiming to optimize simultaneously three objective functions representing the expected values of the energy cost corresponding to the base case, corrective control cost under the most severe contingency, and the VAR reserve from the committed conventional synchronous generators. The total objective function is achieved while satisfying, for each addressed scenario, a set of operating constraints including explicitly the probable active power output of DFIG wind turbine and its relevant VAR capability limits as well as voltage stability margin.