Title :
A novel DC-link voltage and current control algorithm for Neutral-Point-Clamped converters
Author :
Porru, Mario ; Serpi, Alessandro ; Marongiu, Ignazio ; Damiano, Alfonso
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Cagliari, Cagliari, Italy
Abstract :
A novel DC-link voltage and current control algorithm for Three-Level Neutral-Point-Clamped converters (NPCs) is proposed in this paper. It is developed with the aim of sharing the overall DC-link voltage among DC-link capacitors as needed, without impairing NPC load performances. The proposed algorithm consists of an external DC-link voltage control loop, which synthesizes an appropriate reference DC-link current profile on the basis of the reference DC-link voltages. Such a current profile is then tracked by means of an inner DC-link current control system. This last synthesizes the most suitable PWM pattern for DC-link voltage regulation, prioritizing NPC load requirements at the same time. The effectiveness of the proposed DC-link voltage and current control algorithm is verified through extensive simulations, which refer to the case study of a three-phase NPC that feeds a Surface-Mounted Permanent Magnet Synchronous Machine.
Keywords :
PWM power convertors; electric current control; power capacitors; voltage control; DC-link capacitors; DC-link voltage regulation; NPC load performances; PWM pattern; current control algorithm; current profile; external DC-link voltage control loop algorithm; inner DC-link current control system; reference DC-link current profile; surface-mounted permanent magnet synchronous machine; three-level neutral-point-clamped converters; Capacitors; Current control; Load modeling; Pulse width modulation; Switches; Torque; Voltage control; Current control; Neutral-point-clamped converter; Pulse width modulation; Three-level converter;
Conference_Titel :
Industrial Electronics Society, IECON 2014 - 40th Annual Conference of the IEEE
DOI :
10.1109/IECON.2014.7049184
