Fractional-order based droop control of an universal wind-turbine system

In this paper it is investigated the use of fractional-order controllers for an universal operation of small-power wind turbine system. Universal inverters should be able to work both connected to the grid both in island mode. Proper active/reactive control strategies are needed to get system work in universal operation. The aim of this paper is to investigate the use of fractional PI (PI
^α
) for active and reactive power control of an universal wind turbine system in order to achieve a better trade-off between dynamical response and stability. The effectiveness of the proposed control method is verified by simulation and experimental results.