Reduction of harmonics distortion and voltage sag of PMSG based wind energy systems connected to distribution networks

Distributed generation based on wind turbine is one of the most growing, effective and potential technologies which has been scattered over the globe. This paper presents a permanent magnet synchronous generator based wind energy system with a static synchronous compensator where an energy storage is incorporated. The combination of battery and capacitor makes this system more efficient in improving its power quality. An AC/DC/AC converter is connected with the system to provide the maximum magnitude of the power to the distribution network; however, it generates harmonics which is a crucial problem. In this paper, the control mechanism of the generator's converter is based on the straight line theory and the pulse width modulation technique is used for designing the voltage source converter of the static synchronous compensator. A proper integration between these control mechanisms creates a stable system. Using PSCAD/EMTDC software, the overall performance of the proposed model is tested on a 12 bus radial network with a non-linear load connected to it. The results obtained from this comprehensive analysis proved that this entire model is successful to eliminate the harmonics, keep the voltage and current within a safe range as well as mitigate the voltage sag.