Active and Reactive Power Control of Doubly Fed Induction Generator Wind Turbines to Answer Grid Codes Requirements

Abstract—Recently, wind energy becomes one of important and promising sources of renewable energy despite its important fluctuations due to wind time varying nature. These fluctuations affect the power quality in the grid, mainly in term of frequency and voltage stability. Thus, Grid Managers are now dictating dynamic profiles for active and reactive powers that must be respected at the Point of Common Coupling (PCC) to make wind installations able to support the control of grid frequency and grid voltage. In this paper, it is detailed one of the most important types of Wind Energy Conversion System (WECS) consisting on Turbine associated with Doubly Fed Induction Generator (DFIG). Vector control concept using stator flux orientation is adopted to allow independent control of active and reactive powers to answer easily Grid Codes requirements. This work is limited to present the PI control with its direct and indirect approaches that are compared by using MATLAB-SIMULINK software. Except its limited robustness, PI Controller stays a simple and easy solution to control the power flow between WECS farms and electrical network. It should be noticed, however, that Indirect approach based on currents control gives better results in term of overshooting rates. This work constitutes a good basis to implement any other PQ control strategy.