New feedback-linearizing controller settles grid inverter in 0.76ms vs 50ms+
A paper shows a 65x faster settling time over cascaded PI controllers.
Deep Dive
A full-state feedback linearization controller is proposed for grid-forming inverters in islanded microgrids. The controller settles a 20 MW reference step in 0.76 ms, while a cascaded PI controller fails to reach the 2% band within 50 ms. The PI controller shows better robustness to filter parameter mismatch due to its inner-loop integral action. The approach eliminates rotational coupling and load conductance nonlinearities.
Key Points
- Feedback-linearizing controller settles 20 MW voltage step in 0.76 ms vs. PI controller failing to reach 2% band within 50 ms
- Method uses full relative degree to cancel rotational coupling, resistive drops, and load conductance in a single feedback law
- Cascaded PI controller shows better robustness to filter parameter mismatch due to inner-loop integral action
- Closed-loop system reduces to two independent double integrators for simple pole-placement design
Why It Matters
Faster microgrid voltage regulation could reduce hardware costs and improve reliability for remote or islanded power systems.