Othman B.k Hasnaoui Direct Drive Permanent Magnet Synchronous Generator Wind Turbine Investigation -low Voltage Ride through Capability Dynamic Behaviour in Presence of Grid Disturbance

In this paper, the authors investigated a Direct Drive Permanent Magnet Synchronous Generator Wind Turbine (PMSG-WT). This study deals with control of the PWM back-to-back converter (AC/AC) of the wind turbine, since the average size of WTG installations has increased due to the advent of larger capacity machines, especially variable speed technology, this raise of integration rate of wind energy could lead to propagation of transient stability and could potentially cause local or system wide blackout. This has provoked many utilities to adopt low voltage ride-through capability (LVRT), its analyze is a deferential element for the new Grid Connection Requirement (G.C.R) and the analyze of the dynamic behavior of the PSMG-WT in presence of the grid disturbance, especially the electromechanical stress on the generator and the turbine. Simulations results have been presented under real parameters of 2MW PMSG-WT in case of normal operating conditions and with presence of grid voltage disturbances. Due to the separation of the PMSG to the grid via the back-to-back converter, the influence of the grid disturbance on the generator is reduced compared to the others type of wind turbine such as Double Fed Induction Generator (DFIG) and the Fixed Speed Induction Generator (FSIG).