Indirect Field Oriented Control With and Without Power Loops for Wind Conversion Systems Based DFIG

Abstract

This work provides a comprehensive comparative analysis of indirect vector control or Indirect Field Oriented Control (IFOC) for Wind Energy Conversion System (WECS) based on Doubly Fed Induction Generator (DFIG). IFOC without power loops (IFOC-WPL) and IFOC using power loops (IFOC-UPL) have been both systematically investigated, simulated and evaluated under three different scenarios of DFIG parameters. Precise numerical simulations have been established using Matlab/Simulink to evaluate the performance of each control strategy under realistic operating conditions. In a first scenario, reduced magnetizing inductance (L<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</inf>) and increased rotor resistance (R<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</inf>) have been implemented to evaluate the system under temperature variations and flux saturation impacts. The second scenario, simulate and evaluate the system performance only under flux saturation by reduced L<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</inf>. While, the system performance under nominal conditions of temperature and flux has been tested in the third scenario. Indices performance such as Integral Time Absolute Error (ITAE) and Integral Absolute Error (IAE) were both used to examine the performance of each control strategy including steady state error, transient response, and robustness against parameter changes. The findings confirm that IFOC-UPL outperforms IFOC-WPL by delivering several performance improvement in term of robustness, overall system stability and accuracy enen under the most challenging conditions.