A systematic controller-design approach for neutral-point-clamped three-level inverters
Espinoza, J.E.; Espinoza, J.R.; Moran, L.A.
Industrial Electronics, IEEE Transactions on
Volume 52, Issue 6, Dec. 2005 Page(s): 1589 - 1599
Digital Object Identifier   10.1109/TIE.2005.858719
Summary: 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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