Study on Module Power Imbalance of Input-Series Output-Parallel DC/DC Converter

Abstract

In recent years medium-voltage solid-state transformers (SST) have gradually developed into smart micro-grid wind energy system and traction system Compared with the line frequency distribution transformer medium-voltage SST increases the operating frequency which reduces volume and weight of magnetic components The DC/DC converter of medium-voltage SST is limited by power semiconductor devices Hence it must select input-series output-parallel (ISOP) topology However the components of deviated parameters for the module cause the module power imbalance which causes damage to components and more heat dissipation Therefore in this thesis the module power imbalance is studied The relation of input voltage and output current sharing is proposed in the ISOP DC/DC converter Moreover using software of SIMPLIS? simulation to verify the feasibility of the proposed relation Finally the prototype circuit of the ISOP resonant DC/DC converter with input voltage of 3 04 kV output voltage of 380 V and output power of 9 5 kW is developed to verify the feasibility of the proposed relation

Date of Award	2019
Original language	English
Supervisor	Jiann-Fuh Chen (Supervisor)