Abstract:
Hybrid Energy Storage Systems (HESS) have evolved as a promising solution for managing
dynamic power demands in active buildings by combining high-power density and high-energy
density storage devices. Nevertheless, the design of efficient, high-gain, and compact
bidirectional DC-DC converters remains a critical challenge. Conventional buck-boost
converters struggle with achieving high voltage gain and efficient bidirectional power flow. To
address these limitations, this thesis presents a new non-isolated bidirectional DC-DC
converter design that delivers a high voltage gain of 25 at a low duty cycle, using a minimal
number of switching components. The proposed converter supports an input voltage range of
25V to 45V, delivers a rated output voltage of 625V, making it suitable for high-voltage energy
storage integration. A Proportional-Integral-Derivative (PID) based voltage control scheme is
developed for output regulation. The proposed design utilizes voltage sensor to create a costeffective and straightforward control system. This feedback is then used to compare against a
reference voltage the error signal is fed into the PID controller which processes it and generates
a control signal which is then fed into a pulse width modulation generator, which produces
switching signals to achieve desired output. Another voltage mode control is developed using
a Type-II compensator to enhance dynamic performance and stability. Furthermore, the paper
elucidates the mathematical modeling and operational modes of the converter. Simulation
results validate the converter’s high voltage gain and improved transient response under
dynamic load conditions.
