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.

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