基于多频段自适应阻抗重塑的双馈风力发电机并网振荡抑制方法OA

Grid-connected operation of doubly-fed induction generators(DFIGs)easily triggers wide-band oscillations.In order to adapt to complex grid operating conditions and scenarios involving DFIG parameter deviations,this paper proposes an adaptive impedance reshaping method that combines coordinated rotor-side and grid-side regulation with segmented frequency control.First,an analytical model of the frequency coupling sequence impedanc for DFIGs is built to clarify the dominant factors affecting impedance characteristics over a broad-band frequency range.Second,a virtual impedance controller is designed for the rotor side with gains dynamically adjusted to the frequency,while employing active damping control at the grid side to adapt to parameter variations,which reshapes the impedance characteristics within sub-synchronous and super-synchronous and intermediate frequency bands,respectively.On this basis,the established impedance model is revised,and the discretization design of the control algorithm is carried out.The feasibility of its engineering application is verified.Finally,Simulation case studies validate the practicability of the proposed control method in various operating scenarios,including series compensation and shunt compensation scenarios.