Wind farms generation limits and its impact in real-time voltage stability assessment

This paper proposes a method to consider the impactof the wind farms maximum current limits on real-time voltagestability assessment. The approach is based in a multi-portequivalent of the system which makes possible to assess theeffect of each wind farm limit on the stability boundary, theapproach indicates the distance to the limit activation and theeffect of each load in such a limit. The wind farm control schemesincludes voltage control and it is represented as a constantcurrent at its limit. A criteria to select the critical bus bar, basedon the generator transformation coefficients, is presented. Thismethodology is tested in a platform that produces synthesizedPMU measurements from time-domain simulations and criticalboundary for the wind-farm limits are shown. The methodology isalso tested for synchronous machines and its parallel structure isexploited when implemented in a High Performance Computingenvironment. A computational time under 2ms shows that themethod is suitable for real-time applications.