Dual-Passivity-based Control based on Capacitor Current Feedback Method for Grid-connected Inverter with LCL Filter to Suppress Peak Resonance and Improve Power Quality

The grid-connected inverter with an LCL-type filter has the ability of attenuating the high-frequency current harmonics. However, the frequency response of an LCL-type filter has a resonance peak. Passive and active based on capacitor current feedback solutions for damping the resonance of the LCL-type filter have been extensively discussed in many paper, which these methods do not consider the output power quality and external disturbances in detai. In this paper, the capacitor current feedback is combined with dual passivity-based control (dPBC) strategy with strong robustness against parameters perturbations of resistors and possessing better dynamic and static performances, which can effectively suppress resonance spikes and improve power quality of the system.