Analysis of Capacitor Voltage and Boost Vector in Neutral-Point-Clamped and H-Bridge Converter

NPC와 B-Bridge 컨버터의 부스트 벡터와 커패시터전압의 해석

This paper discover another boost vectors in high modulation index In steady states, modulation index of converter operation is normally $0.7\~0.8[p.u]$. Even though zero vectors are not imposed, DC-Link voltage is constant because 3-level boost convert has another boost vectors. and this paper proposes the analysis and the comparison for NPC and H-Bridge converter. It proposed the calculation method for the voltage ripple and charging current of each capacitor and deals with voltage balance problems of each link capacitor they are associated with the switching state, the position of reference voltage vector. Simulation and analysis are used in order to prove validity of the proposed methods.