A Novel Three-port Inverter with Flying Capacitor

  • 方 冠升

Student thesis: Master's Thesis


The micro-inverters using decoupling circuit are popular for stand-alone renewable system applications recently because the three-port interface makes the system more flexible In Addition the multi-level inverters are particularly prominent for high power applications because of the low total harmonic distortion performance without increasing the switching frequency By combining the three-port concept and the multilevel inverter technique a novel three-port inverter is proposed in this thesis The proposed topology can achieve three-port single-stage interface charging regulator and high-power application simultaneously Besides the topology has the advantages of the low switch voltage stress and less component Finally a prototype of the inverter with an input port for 400 Vdc voltage source a bidirectional port for 100 V battery and an AC output port for 120 Vac_rms is implemented to verify the theoretical analysis The experimental results show that the voltage total harmonic distortion before filter in SISO mode is lower than 7% The voltage total harmonic distortion before filter total harmonic distortion in DISO and SIDO modes are lower than 11 7% The efficiency in SISO is up to 98 1% and the system efficiency is up to 98 1% and 98 7% in DISO and SIDO modes
Date of Award2014 Aug 16
Original languageEnglish
SupervisorJiann-Fuh Chen (Supervisor)

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