Research on Loss Balance Modulation Strategy Based on Single-phase Half-Bridge TL-ANPC Inverter

Abstract

Three Level Active Neutral-Point-Clamped (TL-ANPC) inverters are under a variety of zero-level redundant switching states, which can overcome traditional neutral-point-clamped inverters. The problem of unbalanced loss of power switch tubes in the Neutral-Point-Clamped (NPC). This paper takes the single-phase half-bridge TL-ANPC inverter as the research object, proposes a loss-balanced modulation strategy for switching devices with bipolar carrier sinusoidal modulation wave decomposition, and derives the implementation process of the modulation strategy. The dynamic commutation process and loss distribution characteristics of the inverter are analyzed. Finally, a simulation model of a single-phase half-bridge TL-ANPC inverter needs to be based on the PLECS and MATLAB/Simulink platforms. The simulation results show that the method proposed in this paper can reduce the imbalance of inverter losses, and also improve the DC side capacitor voltage imbalance and reduce the harmonic content of output voltage.