Abstract
This paper describes phase current reconstruction methods from dc-link currents in three-phase three-level PWM inverters. Since the three-level inverters have three paths between dc-link and power switches, the reconstructions differ from that in two-level inverters which have two paths there. Considering these paths in three-level inverter, this paper proposes the methods for phase current reconstruction. While the reconstruction method is executed by the currents sampled on the dc-links, the system encounters current-unmeasurable areas where the dc currents cannot be sampled due to the lack of measurement time according to the PWM status. This paper analyzes the areas and proposes a minimum voltage injection method for minimizing them to guarantee accurate current reconstruction. The method provides the expanded operating areas especially in low-output voltage operation and the minimized distortions in output voltages. The feasibility of the proposed method has been assessed in experiments.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
