Stabilization of grid connected wind power system by using ECS

Abstract

It is very important to stable the grid connected wind farms output power. This paper presents a fixed speed wind turbine based Induction generator (IG) including energy capacitor system (ECS) which is the combination of power electronics and electric double layer capacitor (EDLC). It is seen that ECS can significantly compensate voltage and power fluctuations of grid-connected fixed-speed wind generator. It is very important to select a proper output power reference of wind farm for smoothing the wind farm output power. This paper proposes a low cost and simple Low Pass Filter (LPF) method to generate the reference output power of a grid-connected wind farm. To stable the output power the proposed control system is designed on the basis to follow line power reference by absorbing or providing real power to or from the ECS and to keep the wind farm terminal voltage at the desired reference level necessary reactive power are also to be supplied. The performance of the proposed system is analyzed by simulation using PSCAD/EMTDC software.