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Adaptive notch filter based active damping control method
Author(s): 
Pages: 108-116
Year: Issue:  9
Journal: Electric Machines and Control

Keyword:  weak gridgrid-connected inverteractive damping controlself-adaptation controlnotch fil-ter;
Abstract: The LCL filter is widely applied as interface between grid-connected inverter and grid due to a preferable high frequency attenuation characteristic. In the condition of weak grid, impedance value of grid model cannot be ignored, and the existence of grid impedance results in different LCL resonant fre-quencies, which challenges traditional active damping control. Based on the analysis of band pass filter based active damping control strategy, an adaptive active damping control was proposed by introducing the application of active notch filter, which can adjust the position of negative resonance point adaptively so as to manage sudden grid changes. Theoretical analysis and simulation results presented on the plat-form of grid-connected PV inverter system indicate the effectiveness and adaptability of this active damp-ing strategy:deviation of system resonance point is correctly traced, besides, harmonic contents of the resonance point and nearby frequency bands is significantly reduced. In addition, system stability can be ensured by the rapid dynamic response characteristic when there is a voltage leap within ± 5%.
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