Stability and Oscillation Suppression of Grid Connected Inverter Based on Sequence Impedance
As a key interface between the distributed generation system and the power grid,the dynamic interaction be-tween the grid-connected inverter and the power grid may lead to the decline or even instability of the stability margin of the grid-connected inverter.In this paper,the harmonic linearization-based modeling method is used to establish the se-quence impedance model of LCL grid-connected inverter with phase-locked loops,and the influence of phase-locked loops and current loops on the stability of the system and their frequencies are analyzed.In order to solve the problem of insufficient stability margin in the resonant frequency band,this paper proposes an impedance reconstruction control method based on grid voltage feedforward.Finally,the effectiveness of the proposed method is verified by Simulink simulation.
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维普
