Abstract:
We propose vector current control derived from direct power control (VCC-DPC) for a three-phase voltage source inverter (VSI) in the synchronous rotating frame using instantaneous real and reactive powers. Since we obtain the VSI d-q axes currents model without Park transformation or the phase-locked loop (PLL) system, the proposed VCC-DPC method has the same control structure as the conventional VCC except for the coordinate transformation.
If the PLL correctly extracts the grid voltage phase angle, the proposed method behaves like the conventional VCC. The proposed method outperforms the VCC due to the PLL’s slow dynamics. Since there is no Park transformation or PLL in the controller implementation, it also reduces computational burden. The proposed method guarantees exponential stability in the operating range for the closed-loop system. Finally, simulation and experimental results with a 15-kW inverter system match theoretical predictions.
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