LCL filters play an important role in grid-connected converters when trying to reduce switching-frequency ripple currents injected into the grid. Besides, their small size and low cost make them attractive for many practical applications. However, the LCL filter is a third-order system, which presents a resonance peak frequency. Oscillation will occur in the control loop in high frequency ranges, especially in current loop in double-loops controlled converters. In order to solve this, many strategies have been proposed to damp resonance, including passive and active methods. This paper makes a review of these methods.
Proceedings of the 2014 Ieee International Energy Conference (energycon), 2014, p. 169-176
LCL filter; Active damp methods; Passive damp method; Grid-connected inverter
Main Research Area:
I E E E International Energy Conference. Energycon Proceedings
2014 IEEE International Energy Conference (ENERGYCON), 2014