Abstract
Due to the increased renewable power penetration level renewable power plants have to provide low-voltage ride-through (LVRT) capability with simultaneous dynamic voltage support, to ensure the grid stability during grid faults. Concerning doubly fed induction generator (DFIG) based wind energy conversion systems (WECS) large transient electromotive forces (EMF) and rotor currents, which may damage the rotor-side converter (RSC), or adversely affect the controllability of the DFIG are induced into the rotor circuit in case of voltage dips. To limit the rotor currents and to accelerate the transient flux component's or transient electromotive force's damping respectively, a virtual resistance demagnetization approach based on the standard dq-control in the synchronous reference frame is discussed. The theoretical results are compared with those of more demanding virtual inductance and virtual impedance approaches. Additionally, to increase the IGBT's current conductivity, a reduction of switching losses due to a simple pulse pattern optimization is provided. The LVRT-capability is verified with measurement results, recorded during a certification campaign at a 2.1 MW WECS in India, concerning the Indian grid code.
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