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1887

access icon free Fault tolerant three-level boost inverter with reduced source and LC count

© The Institution of Engineering and Technology
Received 01/02/2017, Accepted 08/10/2017, Revised 15/09/2017, Published 10/10/2017

Presently single stage boost multilevel inverters are becoming more popular for power conversion in renewable energy systems, AC–DC hybrid microgrids etc. Usually in these boost inverter the voltage stress across the inverter leg switches as well as current through these switches are quite higher as compared to load ratings which increases the chances of inverter leg switch failure. In this paper a three level voltage source boost inverter is proposed to achieve rated three level AC output voltage in a single power conversion stage. It retains all the advantages of three level quasi Z- Source inverter by using less number of passive components in the intermediate network between DC source and inverter leg. Beside the inherent shoot through fault tolerant feature the proposed inverter is capable to operate in open circuit failure to give rated balanced AC voltage at load. The above advantages of the proposed single stage inverter make it suitable for low and medium power renewable energy applications where size, weight are main constraint and some of the critical loads are connected to the system. The proposed inverter is verified by simulation (in MATLAB Simulink) and experiment with the help of a laboratory prototype.

Inspec keywords: failure analysis; fault tolerance; invertors; power semiconductor switches; AC-DC power convertors; DC-DC power convertors; distributed power generation; voltage-source convertors

Other keywords: single power conversion stage; single stage inverter; rated balanced AC voltage; fault tolerant three-level boost inverter; low-power renewable energy applications; renewable energy systems; medium-power renewable energy applications; three-level voltage source boost inverter; rated three-level AC output voltage; MATLAB Simulink; passive components; inverter leg switch failure; reduced source; voltage stress; single stage boost multilevel inverters; AC-DC hybrid microgrids; open circuit failure; LC count; DC-DC converter; h-bridge inverter; impedance network

Subjects: DC-AC power convertors (invertors); Relays and switches; DC-DC power convertors; AC-DC power convertors (rectifiers); Distributed power generation; Reliability; Power semiconductor devices

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