Damping Improvement of a Large-scale Offshore Wind Farm Fed to a Multimachine Power System Using a Generalized Unified Power-Flow Controller

Abstract

This paper presents the damping-improvement outcomes of a large-scale offshore wind farm (OWF) based on doubly-fed induction generator (DFIG) fed to a two-area four-generator power system using a generalized unified power-flow controller (GUPFC). Two proportional-integral-derivative (PID) damping controllers and two fuzzy logic controllers (FLCs) of the proposed GUPFC are designed to improve the damping of the dominant modes of the studied multi-machine power system under different operating conditions, respectively. Eigenvalue analysis and nonlinear-model simulations are both performed to examine the effectiveness of the proposed GUPFC equipped with the designed damping controllers. The comparative simulation results show that the proposed GUPFC joined with the designed FLCs demonstrates better damping performance for improving the damping of the dominant modes of the studied multimachine system subject to different disturbances than the designed PID damping controllers.