New impedance model stabilizes droop-controlled inverters under grid imbalance
Novel scheme captures mirror frequency coupling effects for more accurate stability analysis.
A novel sequence impedance modeling scheme for droop-controlled inverters (DCIs) under unbalanced power grid conditions is presented. The method uses harmonic linearization and a single-input single-output approach to fully capture mirror frequency coupling effects (MFCE) and unbalanced factors—overcoming limitations of existing models. It identifies dominant stability factors via normalized sensitivity analysis and proportional weighting, validated on an experimental DCI platform. The work is accepted for publication in IEEE Transactions on Industrial Electronics.
- Proposes a novel sequence impedance model for droop-controlled inverters using harmonic linearization and single-input single-output method.
- Captures mirror frequency coupling effects (MFCE) and unbalanced factors, addressing a key gap in existing stability analysis.
- Validated on an experimental grid-connected DCI platform; accepted for publication in IEEE Transactions on Industrial Electronics.
Why It Matters
Enables more accurate stability analysis for renewable inverters in unbalanced grids, reducing oscillation risks and improving reliability.