Topology Optimization and Unified Control of Dual Active Bridge Converters for Flexible DC Grids with Energy Storage Integration

Dual Active Bridge (DAB) converters have emerged as a pivotal solution for energy conversion and management in flexible DC grids due to their bidirectional power flow capability and wide operating range. This paper delves into the advanced topology optimization techniques tailored for DAB converters in the context of the flexible DC grid systems integrated with energy storage. A paramount focus is given to the design methodologies that enhance system efficiency, reliability, and dynamic performance. An innovative unified control strategy is also proposed to ensure seamless operation under varying grid and load conditions, emphasizing transient responses and energy storage management. The optimized topology, coupled with the advanced control approach, holds the potential to fortify the operational integrity of flexible DC grids with integrated energy storage solutions. Numerical simulations and experimental validations manifest the efficacy of the proposed techniques, highlighting their significance in the evolution of next-generation power systems.

I. Introduction

The continuous growth of renewable energy sources and the ever-increasing demand for efficient energy conversion systems have propelled the development of advanced power electronic systems [1]. One of the outcomes of this technological evolution is the emergence of flexible DC grids, which have come to be seen as a linchpin in the modern power architecture due to their potential for seamless energy flow control and efficient power conversion. DAB converters have gained substantial traction in this arena. Figure 1 provides a visual representation of a standard DAB converter. Their inherent ability to manage bidirectional power flow and operate over a wide voltage range has made them indispensable in the domain of flexible DC grids [2]. However, the complexities of integrating various energy sources and the incessant demand for high efficiency and reliability necessitate further research into optimizing their topologies and control methodologies.