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A Modified Direct Power Control Strategy Allowing the Connection of Three-Phase Inverters to the Grid Through LCL Filters

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4 Author(s)
Serpa, L.A. ; Swiss Fed. Inst. of Technol., Zurich ; Ponnaluri, S. ; Barbosa, P.M. ; Kolar, J.W.

This paper proposes a novel approach to adapt a conventional direct power control (DPC) for high-power applications, where a third-order LCL filter is frequently required. The LCL filter can cause a strong resonance and requires additional effort for system control. The application of a DPC for the control of a three-phase voltage source inverter that is connected to the grid through an filter has not yet been considered. The addition of an active damping strategy, together with a harmonic rejection control loop, to the conventional DPC is proposed and analyzed in this paper. The steady-state, as well as the dynamic performance of the proposed system, is verified with simulation results and experimental measurements.

Published in:

Industry Applications, IEEE Transactions on  (Volume:43 ,  Issue: 5 )

Date of Publication:

Sept.-oct. 2007

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