Study and Implementation of Two-stage High Step-up Five-level Converter with Low Input/Output Current Ripple

Abstract

Due to the limited fossil countries in the world are developing renewable energy sources Output voltage of solar cells is low So it is required to boost the voltage and energy from DC to AC If input current ripple of conventional boost converter is large the maximum power tracking of the converter used in the PV system will be inaccurate In order to obtain better performance output voltage harmonics of inverter should be reduced To solve the aforementioned problems a low ripple DC/AC converter is proposed by National Tsing Hua University professor Ching-Tsai Pan in memory of his father Mr Kung Pan (K P ) First stage is a low input current ripple high step-up DC/DC converter and second stage is five level inverter with passive ripple cancellation filter In this thesis a converter prototype with input voltage 150Vdc the output voltage 220Vrms and a rated power 3kW is implemented The results show that the proposed converter reduce the input ripple current by 98 1% Input current ripple’ amplitude can be reduced to 200mA Five-level inverter with passive ripple cancellation filter can output high power quality

Date of Award	2016 Aug 22
Original language	English
Supervisor	Jiann-Fuh Chen (Supervisor)