Abstract
Grid-connected wind turbines are fluctuating power sources that may produce flicker during continuous operation. This paper presents a simulation model of a MW-level variable speed wind turbine with a full-scale back-to-back power converter and permanent magnet synchronous generator (PMSG) developed in the simulation tool of PSCAD/EMTDC. Flicker emission of this system is investigated. The 3p (three times per revolution) power oscillation due to wind shear and tower shadow effects is the significant part in the flicker emission of variable speed wind turbines with PMSG during continuous operation. A new method of flicker mitigation by controlling the rotational speed is proposed. It smoothes the 3p active power oscillations from wind shear and tower shadow effects of the wind turbine by varying the rotational speed of the PMSG. Simulation results show that damping the 3p active power oscillation by using the flicker mitigation speed controller is an effective means for flicker mitigation of variable speed wind turbines with full-scale back-to-back power converters and PMSG during continuous operation.
Highlights
During the past 20 years, renewable energy has become an increasing part of the worldwide power generation and especially wind energy has captured a significant part of this power production
The flicker emission produced by grid-connected variable speed wind turbines with full-scale back-to-back converters during continuous operation is mainly caused by fluctuations in the output power due to wind speed variations, the wind shear and the tower shadow effects [3]
The 3p power oscillations from the wind turbine due to wind shear and tower shadow effects are actively damped by a flicker mitigation speed controller (FMSC), such that the flicker can be mitigated under any conceivable operation condition
Summary
During the past 20 years, renewable energy has become an increasing part of the worldwide power generation and especially wind energy has captured a significant part of this power production. The flicker emission produced by grid-connected variable speed wind turbines with full-scale back-to-back converters during continuous operation is mainly caused by fluctuations in the output power due to wind speed variations, the wind shear and the tower shadow effects [3]. The 3p power oscillations from the wind turbine due to wind shear and tower shadow effects are actively damped by a flicker mitigation speed controller (FMSC), such that the flicker can be mitigated under any conceivable operation condition. When the FMSC damps the 3p active power oscillations which are the significant parts in the flicker emission, it smoothes the active power fluctuations into the grid by varying the rotational speed of the PMSG.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
