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Control Strategies for Isolated High-Frequency Modular DC/DC Converter Implemented in Programmable Logic Array

The main topic of the article is control strategies for high-frequency modular DC/DC converters, which are increasingly applied in electrical power systems, e.g. in DC microgrids and energy storage systems. The paper presents dual active bridge (DAB) modulation methods and an evaluation of their properties and implementation possibilities in high-frequency modular solutions. Furthermore, an analysis of their impact on important parameters of modular systems (such as DC-bias current in dynamic states) is discussed. Technical aspects of choosing a digital controller for these systems as well as an algorithm implementation in FPGA, that provides very good dynamic properties with minimization of DC current ripple and support for a large number of DAB modules are also presented.