An Improved Combined Control for PMSG-Based Wind Energy Systems to Enhance Power Quality and Grid Integration Capability

Abstract

Fast transient and smooth steady state responses are among the most important desirable requirements of permanent magnet synchronous machine based wind energy conversion systems to provide power quality and grid connection capability. Combined control, has a potential to accommodate the mentioned features, by using vector control and direct torque control. In this paper, it is shown that the conventional combined control can be improved effectively by fully employing the potential. Investigating the fundamental basis of combined control by new mathematical analysis, an improved combined control system is introduced which provides faster transient and smoother steady state responses of the system in comparison with the conventional combined control. The system performance features enhance the grid connection capability of the machines and improve the THD of transferred power to the grids.