Abstract
The impact of converter control strategies on the drive train of wind turbines during voltage dips is investigated in this paper using a full electromechanical model. Aerodynamics and tower vibration are taken into consideration by means of a simulation program, named FAST. Detailed gearbox and electrical subsystems are represented in MATLAB. The dynamic response of electromagnetic torque and its impact on the mechanical variables are the concern in this paper and the response of electrical variables is less discussed. From the mechanical aspects, the effect of rising power recovery speed and unsymmetrical voltage dips are analyzed on the basis of the dynamic response of the high-speed shaft (HSS). A comparison of the impact on the drive train is made for two converter control strategies during small voltage dips. Through the analysis of torque, speed and tower vibration, the results indicate that both power recovery speed and the sudden torque sag have a significant impact on drive trains, and the effects depend on the different control strategies. Moreover, resonance might be excited on the drive train by an unbalanced voltage.
Highlights
In recent years, wind turbine generation systems have experienced a significant increase of penetration in electrical grids around the world
The doubly fed induction generators (DFIGs) 1.5-MW wind turbine model used in this paper considers the interaction among the aerodynamic, mechanical and electrical subsystems through co-simulation of the software package
Symmetrical and unsymmetrical faults have been simulated in this paper, which focuses on the impact on the drive train due to the different rotor side converter (RSC) control strategies under grid fault conditions
Summary
Wind turbine generation systems have experienced a significant increase of penetration in electrical grids around the world. A comparison on the response of mechanical parts under single-phase and a three-phase voltage dip conditions was studied. The impact on the drive train will be quite different due to the different control strategies implemented in the converter. This aspect has been less studied in previous works. The rising speed effect of power recovery, the reference value effect of electromagnetic torque during a small voltage dip and the torque response under unbalance voltage conditions are investigated based on the mechanical variables, such as HSS torque, generator speed and tower vibration. The DFIG 1.5-MW wind turbine model used in this paper considers the interaction among the aerodynamic, mechanical and electrical subsystems through co-simulation of the software package.
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