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A systematic controller-design approach for neutral-point-clamped three-level inverters

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3 Author(s)
Espinoza, J.E. ; Innovation Technol. Dept., Ind. Support Co. Ltd., Santiago, Chile ; Espinoza, J.R. ; Moran, L.A.

This paper proposes a simple linear feedback-based control technique that ensures zero-neutral-point (NP) potential in three-level voltage-source inverters. The technique works even under dynamic load conditions and enables the decoupled control of the direct and in-quadrature load currents. The technique is based on the relative-gain-array (RGA) approach, which has been successfully used in the control of chemical-engineering processes. The resulting scheme allows the use of outer control loops to set the direct and in-quadrature load currents as required for the specific application (e.g., adjustable speed drives). Experimental results prove the theoretical considerations and show the simplicity of the proposed control scheme.

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Industrial Electronics, IEEE Transactions on  (Volume:52 ,  Issue: 6 )