Modelling and Analysis of DFIG based Power System

Abstract

Doubly Fed Induction Generator (DFIG) based wind penetration in the power sys- tem is increasing every day. Many issues like inertia reduction, reduced Low voltage ride through capability, system stability etc. are also to be handled while increasing the wind generation penetration. It is meaningful model DFIG based power system and perform various analysis on the same. Among all the issues that has been writ- ten above mainly inertia reduction and stability related issues has been discussed in this thesis. Considering the inertia reduction issue, the controller of the system functions to change the torque set point, adjusting pitch compensation and maxi- mum power, so that the converter responds to the changes in the frequency during transient conditions in order to increase the effective inertia of the system. In order to check the stability of any system eigen value analysis is a tool to employ and has been discussed here. Synchronous generators based SMIB is modelled mathematically and the obtained eigen values are verified by finding the eigen values from in the standard software. Further, one synchronous machine is replaced by equivalent rating of DFIG (farm) in SMIB system and WSCC 9 bus standard test system. The system eigen values are determined analytically and validated through software.