Research on capacity configuration method of concentrated reactive power compensator for wind farm LVRT capability

Abstract

In order to fulfil the requirement for low‐voltage ride‐through (LVRT) capability, the wind farms need to inject the reactive currents during grid fault to support voltage recovery. As the main concentrated reactive power compensator, the static var generators (SVGs) are widely employed in the wind farm for reactive current injection. This study investigates the dynamic reactive currents of the wind turbine based on the field‐test data during the grid faults. Then, the scheme that taking wind turbines as main reactive current sources and SVG as compensator is adopted to realise the wind farm LVRT capability. According to this scheme, the capacity configuration method of SVG is developed, which can be used to design SVG capacity to improve the wind farm dynamic reactive current behaviour. Finally, the simulation results are provided to demonstrate the effectiveness and the availability of the proposed method.