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.
|Conference||2014 IEEE International Energy Conference (ENERGYCON)|
|Period||13/05/2014 → 16/05/2014|
|Series||I E E E International Energy Conference. ENERGYCON proceedings|
- LCL filter
- Active damp methods
- Passive damp method
- Grid-connected inverter