Fault tolerant-topology and controls for a three-level hybrid neutral point clamped-flying capacitor converter

• Published in: IET power electronics 2016-10, Vol.9 (12), p.2350-2359
• Main Authors: Ben Abdelghani, Hafedh, Bennani Ben Abdelghani, Afef, Richardeau, Frédéric, Blaquière, Jean-Marc, Mosser, Franck, Slama-Belkhodja, Ilhem
• Format: Article
• Language: English
• Subjects: Capacitors; converter fault‐tolerant capability; converter NP voltage balance; Converters; Decoupling; Electric power; Electronics; Engineering Sciences; fault diagnosis; fault isolation; Fault tolerance; fault tolerant‐topology; Faults; FC‐based leg; flying capacitor leg; neutral point clamped‐based phases; post‐fault converter; power convertors; Special Section: Hybrid Multilevel Converters: Topologies Modulation and Control; Strategy; switch fault occurrence; three‐level hybrid fault‐tolerant converter; three‐level hybrid neutral point clamped‐flying capacitor converter; Topology
• ISSN: 1755-4535; 1755-4543; 1755-4543; 1755-4535
• DOI: 10.1049/iet-pel.2015.0785

This study details a three-level hybrid fault-tolerant converter. The definition of an original decoupling solution between the fourth flying capacitor (FC) leg and the three neutral point (NP) clamped-based phases overcomes topology hybridisation issues. Under normal conditions, a control strategy of the FC-based leg leads to a converter NP voltage balance, and decreases the DC side capacitors’ volume and cost. Under fault conditions, the presented fault isolation and converter reconfiguration strategies generate a post-fault converter, which is able to operate safely with the added FC-based leg. The proposed topology is an interesting trade-off between converter fault-tolerant capability and its complexity and offers the ability to be simply reconfigured and controlled in the case of switch fault occurrence. Two operation modes under fault conditions are presented and their performances are shown and discussed through simulation results and first experimental tests.