Multiwinding Transformer Leakage Inductance Optimization for Power Flow Decoupling in Multiport DC-DC Converters

Abstract

Isolated multiport DC-DC converters manifest some prominent advantages over usual multiple two-port DC-DC converters such as smaller holistic magnetics and higher power density. However, the operation of such a converter is tied to the power flow decoupling capability in the magnetic medium frequency transformer (MFT). This paper targets to optimize the decoupling between the multiwinding MFT ports by means of multi-objective optimization of the leakage inductance network. Three different multi-objective cost functions are proposed and solved by Genetic Algorithm (GA). The obtained results show that a winding topology where primary winding is sandwiched by the two secondaries and are tightly wound to the core, provides the minimum possible leakage inductance without interleaving the windings. The obtained topologies from solving different objectives can be used as a benchmark in design and manufacturing of mutliwinding transformers. Experimental results are provided to verify the obtained optimum design.

Dynamics analysis for DC transformers integration in hybrid AC‐DC power distribution networks

“…The plant model remains the same as the VR-VR configuration Model II, presented mathematically in (8).…”

“…Galvanically DC/DC isolated converters [5] are employed to provide voltage adaptation and a similar behavior as AC transformers. A lot of development has been done around DCTs: new topologies with modular designs [6], development of high power bulk power processing converters with high power semiconductor switches [7], multiport converters [8,9] and energy routers [10][11][12]. Converters can be controlled in closed-loop, typically with topologies such as Dual Active Bridge (DAB) [13], or in open-loop, using resonant topologies.…”