Symmetrical tuning for resonant controllers in inverter based micro-grid applications

Voltage source inverters in micro-grid applications need the effective control of the filter output voltages. Harmonic compensation is a mandatory request to eliminate voltage distortion due to non-linear and unbalanced loads. The use of resonant controllers allows achieving high quality voltage regulation. The proposed paper investigates a closed form tuning strategy for controllers´ parameters selection based on the symmetrical frequency behavior of the whole resonant controller structure. Symmetrically tuned controllers allow achieving the largest bandwidth around the resonance frequency in a multi-resonance controller structure.