Abstract:
This thesis presents a broad study and design of Dual Active Bridge (DAB) converter based Boost Inverter
for many applications such as Grid connected inverters, rectifiers and Solid state transformer etc. Inverter
has the property to step down the output voltage which reduces the gain therefore, the main purpose of
the proposed design is to increase the gain of the inverter.
The proposed topology consist of active H-bridge inverter on the primary and Inverter rectifier on the
secondary side of single phase high-frequency toroidal transformer. Output voltage can be realized with
the help of gate pulse provided by sine Pulse width modulation. Power is transferred from the primary
side bridge to the secondary side bridge through high frequency toroidal transformer. DAB converter acts
as boost stage for DC supply and converts LV to HV according to the gain/turns ratio of the HFT. HVDC
is then applied to DC/AC inverter and fundamental voltage is achieved after passing the output of inverter
through LC filter.
DAB converter rely only on the characteristics of the transformer to accomplish high gain. Proper design
of toroidal transformer and study magnetizing and leakage inductance based on high-frequency is the
achieved in the proposed system. In this work, two-winding toroidal transformers are modeled and
simulated using ANSYS Maxwell, and the variation of the leakage inductance due to the windings’
distribution is analyzed. Minimizing the leakage inductance of a transformer which is a challenging task
is achieved using Finite Element Analysis (FEA). Analysis of transformer in ANSYS Maxwell is more
economical and time-saving than repeatedly construct and test prototypes. Simulation results are provided
to verify the analytical analysis.
Three phase voltage fed inverter with Sic MOSFET module has been designed and implemented.
Designed and implemented inverter had been operated using SPWM modulation with the input voltage
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and output voltage has been investigated. Minimum total harmonic distortion (THD) under SPWM has
been recorded.
