Fuzzy Control based Speed Control Strategy of Wind Turbine for Frequency Regulation

The control objective of DFIG in the frequency regulation stage is to provide active power support for the power grid by releasing rotor kinetic energy. However, the control objective of the inherent control link represented by the speed controller is to maintain stable operation of rotor speed. For this reason, the fuzzy cooperative control and parameter correction strategy of the speed regulator in the frequency regulation stage of DFIG is proposed. Firstly, the mapping equivalent model between the parameters of the frequency regulation control link and the operating point is proposed by using the energy corresponding modes of rotor kinetic energy, pitch angle load shedding and virtual inertia and primary frequency regulation. Secondly, the influence of speed controller parameters on the inertia response link is analyzed, Based on the fuzzy logic algorithm, a speed controller dynamic operation algorithm is proposed to improve the power grid frequency control effect, which alleviates the inherent contradiction between the speed controller and the frequency regulation link.