Enhanced Transient Performance of Wind-Driven PMSG: A Revised Control Structure of Wind-Power Converters

To deal with low-voltage ride-through (LVRT) and to enhance the transient performance of a grid-connected wind-driven permanent-magnet synchronous generator during voltage dips on the grid side, this study presents a revised control structure for wind-power converters, comprising a machine-side converter (MSC) and grid-side converter (GSC). In the proposed approach, the control variables' references are modified with grid voltage, and the revised control designs for the MSC and GSC are established. During voltage dips, the captured wind power is stored as the kinetic energy of the turbine rotor. The active component of the stator current is curtailed according to the dip level by terminating the maximum power tracking operation. The modified GSC current references assist the grid in providing the required reactive current and attempt to minimize the power loss by utilizing the maximum GSC current-carrying capacity. The revised controls are responsible not only for maintaining the DC-link voltage and GSC current within safe limits, but also support the grid in providing reactive power during voltage recovery. Simulations verify the suitability and effectiveness of the proposed design in handling LVRT operations and providing additional flexibility by incorporating stability and security constraints.