Robust Active Damping for LCL-Type Grid-Connected Inverter with Capacitor Current Quasi-Integral Feedback
IET Power Electronics(2020)
摘要
Considering the time delay introduced by the digital control, it turns out that capacitor current proportional feedback active damping (AD) is equivalent to a frequency-dependent virtual impedance in parallel with the filter capacitor. Unstable open-loop poles will arise due to the presence of virtual negative resistor, which causes that the system stability is highly sensitive to grid-impedance v...
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关键词
damping,delays,digital control,feedback,invertors,power capacitors,power filters,power grids,resistors,robust control
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