A New Control Technique for Improved Active-Neutral-Point-Clamped (I-ANPC) Multilevel Converters Using Logic-Equations Approach
The per-phase leg of an improved active-neutral-point-clamped (I-ANPC) multilevel converter is realized by the cascaded connection of the standard ANPC topology and the concatenated H-bridge modules consisting of the flying-capacitors (FCs). This paper proposes an innovative approach for active control of the I-ANPC inverters. The introduced methodology is developed on the basis of the logic-equations set for active voltage balancing of the FCs within the H-bridge modules, and controlling the generated output voltage. It derives logic-variables employing the direction of the output current, and the deviation of the FCs' voltages from their target operating levels in the H-bridge cells. These logic-variables are fed into a set of logic-equations derived for control of I-ANPC inverter. The regulation of the floating-capacitor voltages at their reference values along with synthesizing the required PWM voltage-level at the output having fast dynamics are the control objectives to achieve. The derived logic-equations and the proposed control method are explored and verified by the experimentally measured results obtained from the 5-kW prototype of a five-level converter.
IEEE Transactions on Industry Applications
Open Access Status
Dargahi, V., Khoshkbar Sadigh, A., Corzine, K., Enslin, J., Rodriguez, J., & Blaabjerg, F. (2019). A New Control Technique for Improved Active-Neutral-Point-Clamped (I-ANPC) Multilevel Converters Using Logic-Equations Approach. IEEE Transactions on Industry Applications, 1–1. https://doi.org/10.1109/TIA.2019.2952316