Event
Ph.D. Research Proposal Exam: Arafat Hasnain
Wednesday, November 13, 2024
11:00 a.m.
AVW 1146
Maria Hoo
301 405 3681
mch@umd.edu
ANNOUNCEMENT: Ph.D. Research Proposal Exam
Name: Arafat Hasnain
Committee:
Professor Alireza Khaligh (Chair)
Professor Xin Zan
Professor Sahil Shah
Date/time: Wednesday, November 13, 2024, 11 am - 12 pm
Location: AVW 1146
Title: Investigation of Dual Active Bridge (DAB) Derived Power Dense Single-Stage Isolated Inverters
Abstract:
Power electronics converters are increasingly gaining importance in renewable energy applications. Single-phase inverter, in particular, which converts direct current (DC) to alternating current (AC) power or vice versa, is one of the most promising applications of power electronics in avenues such as solar photovoltaic (PV) and electrified transportation. Traditionally, the architecture of isolated single-phase inverters requires two discrete power conversion stages, i.e. an isolated DC-DC stage with a voltage boost cascaded with an additional high voltage DC-AC stage. This Ph.D. research proposes a study of isolated single-stage inverters based on dual active bridge (DAB) converters, which are typically used for DC-DC conversion. By studying the impact of topological modifications using direct matrix variations, this study extends the advantages of DAB converters for compact and high-efficiency inverter applications.
The proposed research focuses on modeling DAB derived topologies in the frequency domain specifically for DC-AC applications. This approach extends the conventional modeling of DAB converters for achieving low switching loss through zero-voltage switching and minimal conduction loss while meeting the AC power tracking requirement. Through the use of optimal phase-shift modulation parameters from non-linear constrained optimization in high-frequency models, the study introduces a three-dimensional lookup table-based methodology that allows the single-stage inverter to operate effectively at grid-line frequency. Furthermore, the integration of bidirectional voltage and current blocking switch configurations and planar magnetics are implemented for a compact hardware design. To further enhance the power density of single-phase inverters, a novel approach of integrating second-order power decoupling in a modified DAB inverter is introduced without the usage of additional active circuitry and large DC-link capacitors. The innovations from this work contribute to the wider adoption of single-stage DAB-based inverters in addressing key challenges within renewable energy systems.
