Suppression of Interactions of Parallel Grid Forming Converters using Decoupled Grid Forming Control

Grid-forming (GFM) converters are essential in modern power systems, providing voltage magnitude, phase angle and frequency regulation, synthetic inertia, potential black-start capability, and stable operation without requiring phase-locked loops, which are prone to instability in weak grids. However, parallel operation of GFM converters, poses challenges due to potential control interactions. Stable performance requires precise active and reactive power control. Conventional GFM strategies typically regulate an internal voltage magnitude and phase angle behind a virtual impedance. Reactive power is controlled via the internal voltage magnitude and active power via frequency droop or virtual synchronous machine dynamics. Effective P-Q decoupling requires d-q frame alignment with terminal…