Optimal Design of Pi Controller for Doubly Fed Induction Generator

Abstract

Due to continuous increase in power demand we can not depend on limited conventional sources so we go for the renewable energysources in which wind energy has proven technology. Among the different variable speed wind turbine doubly fed induction generator(DFIG) is the commonly used wind turbine in growing wind market. DFIG is usually used to satisfy grid code requirements such as power quality improvement, grid stability,grid synchronization, power control andfault ride through in grid connected wind energy conversion system. To fulfill these requirements DFIG needs a control strategy for both stator and rotor side along with variable frequency power electronic converters (VFC).

VFC normally controlled by set of PI controllers, tuning of these controller gains is a tedious task due to non-linearity and complexity of the system.  PSO algorithm is used to to find the optimal parameters of various  PI controllers for rotor side converter of VFC to apply a proper voltages to the rotor windings to maintain constant terminal voltage and control of active and reactive power of DFIG.