作者: Stewart Geoffrey Parker , Brendan P. McGrath , Donald Grahame Holmes
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摘要: The control of a grid-connected voltage source inverter with an inductive-capacitive-inductive (LCL) filter is very challenging task, since the LCL network causes resonance phenomenon near to stability boundary. While many active damping methods have been proposed overcome this issue, role that pulse width modulation transport delay plays in effectiveness these strategies still not fully resolved. This paper presents theoretical discrete time-analysis framework identifies three distinct regions resonance, namely, high resonant frequency region where required, critical controller cannot stabilize system, and low essential. Suitable controllers are then for two stable regions, gain calculations allow greatest system bandwidth damping. Simulation experimental results verify presented analysis.