Energy Management and Power Control for a Grid-Connected PMSG Wind Energy Conversion System with Extra Function of Harmonic Elimination for Local Nonlinear Loads

Abstract

Wind energy conversion maximum power extracting along with power quality issues both play a crucial role in the power systems. This paper demonstrates the feasibility of using a new controlling method for simultaneously performing the maximum power point tracking and decreasing grid current total harmonic distortion (THD) as an extra function in wind energy conversion using permanent magnet synchronous generator (PMSG). While enhancing the grid power quality using proposed method, an improved maximum power point tracking (MPPT) algorithm based on optimum torque controlling is employed. Resorting this improved algorithm increases MPPT efficiency to be higher than 97% in all operation modes. In this study, a PMSG wind energy conversion with nominal power of 20 KW at wind speed of 9 m/s is considered for simulation. This system is connected to the local nonlinear load and the grid. Simulation results including MPPT dynamic and steady state behaviors in three different wind speeds and THD analyzing in presence and absence of harmonic elimination extra function show impressive benefits of the proposed method.