Rapid LVRT Control of a DFIG-Based Wind Power Plants Based on Adaptive IQ-V Characteristics

摘要

Wind turbine generator should inject the reactive power to support the grid voltage and suppress the increase in the DC-link voltage during a fault in order to fulfil the low voltage ride-through (LVRT) requirement in grid codes. This paper proposes a rapid LVRT control of a Doubly Fed Induction Generator (DFIG) based Wind Power Plants (WPPs) based on the adaptive reactive current to voltage characteristics that suppresses the rise in DC-link voltage by reducing the torque in the rotor side converter (RSC) of the DFIG in proportion to the voltage dip and weighting factor at the terminals of the DFIGs. The current priorities from the real current to the reactive current to inject more reactive power to support the grid voltage during a fault is proposed in this scheme. The RSC of the DFIG is operated in the voltage control mode with the slope of the reactive current capability to the voltage tolerance around a rated value. In addition, slope is changed relying on the voltage dip during a fault to support the grid voltage. The proposed scheme is performed for twenty units of 5-MW DFIGs using an EMTP-RV simulator. The results depict that the scheme rapidly supports the grid voltage and suppresses the rise in DC-link voltage during a fault.