Adaptive notch filter-based active damping technique for grid-connected inverters with LCL filter under resonance drift conditions
Abstract
Abstract LCL filters are commonly used in grid-connected inverters but suffer from resonance, which may compromise stability. Active damping with a notch filter is effective, yet its performance is sensitive to variations in grid inductance and load conditions, leading to misalignment between the notch and actual resonance frequency. To address this issue, this paper proposes an adaptive notch filter that tracks the resonant frequency in real time using a synchronous-reference-frame phase-locked loop (SRF-PLL). The proposed method enables automatic frequency alignment without additional sensors or complex estimation algorithms. Both theoretical analysis and experimental validation demonstrate that the approach ensures stable current control under varying grid conditions.
Fields of Study & Subjects
Microgrid Control and Optimization
Wind Turbine Control Systems
Islanding Detection in Power Systems
Publication details
- Journal / source
- Journal of Power Electronics
- Publisher
- Springer Science and Business Media LLC
- Volume
- 26
- Issue
- 3
- Pages
- 638–647
- Publication date
- 2 February 2026
- Language
- EN