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A Symmetric Carrier Technique of CRPWM for Voltage Balance Method of the Flying Capacitor Multi-level Inverter  

전재현 (한양대 전기공학과)
김태진 (한양대 전기공학과)
강대욱 (한양대 전기공학과)
현동석 (한양대 공대 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers B / v.52, no.12, 2003 , pp. 624-631 More about this Journal
Abstract
This paper presents a simple carrier symmetric method for the voltage balance of flying capacitors in FCMLI(flying capacitor multi-level inverter). To achieve the voltage balance of flying capacitors, the utilization of each carrier must be balanced during a half-cycle of the switching period such as PSPWM(Phase-Shifted PWM). However, the CRPWM(Carrier Redistribution PWM) method causes the fluctuation of flying capacitor voltages because the balanced utilization of carriers is not achieved. Moreover, it does not consider that the load current change has an influence on flying capacitor voltages by assuming that the current flows into the load. To overcome the drawbacks of CRPWM, it is modified by the technique that carriers of each band are disposed symmetrically at every fundamental period. Firstly, the CRPWM method is reviewed and the theory on voltage balance of flying capacitors is analyzed. The proposed method is introduced and is verified through the experiment result.
Keywords
Carrier-Redistribution PWM; Flying Capacitor Multi-Level Inverter; Flying Capacitors' Voltage Balance; Carrier symmetry meth;
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