Variable-Speed Wind Turbines with Doubly-Fed Induction Generators

Abstract

Variable-speed pitch-controlled wind turbines with doubly-fed induction generators (DFIG) are modelled for power system dynamic stability. The model is explained and the parts of the model are verified. The model is implemented in the simulation tool PSS/E and created as a modular structure. This means that it is possible easily to add other control loops, as other modules, to the existing model code for ad-hoc investigations. This article is the first part of a large work dealing with investigation of dynamic interaction between the variable-speed wind turbines equipped with DFIG and the power grid.

Application of a Heat Flux Sensor in Wind Power Electronics

“…However, modern variable-speed wind turbines involve the operation of the generator-side inverters at lower frequencies. In doubly-fed drives, in particular, the rotational speed and the corresponding fundamental frequency of the load current are limited to around˘30% of their synchronous values [26]. Thus, at low operating frequencies, the IGBT thermal impedance has a lower attenuation effect on thermal cycling than at the 50 Hz operating frequency.…”

Effect of power converter on condition monitoring and fault detection for wind turbine

“…The generator used was a DFIG and was modelled as a 5th order system of differential equations which can be found in [14].…”

Control of Grid Voltage and Power of Doubly Fed Induction Generator wind turbines during grid faults

“…The damping controller is tuned to actively damp the torsion oscillations excited at a grid fault in the drive train system. [11] shows that absence or insufficient tuning of this PI controller may lead to self-excitation of the drive train system and to a risk of grid power tripping as protection against vibrations in the mechanical construction. The pitch control system is not able to damp the torsion oscillations, because of several delay mechanisms in the pitch [12].…”