Switching Frequency Optimization for a Solid State Transformer With Energy Storage Capabilities

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Abstract
This paper is focused on determining the efficiency dependency on the switching frequency for a solid state transformer (SST) with one of the ports connected to an energy storage device (Lithium-Ion battery). Some contributions for measuring the efficiency/losses for different power converter structures for energy storage applications can be found in the literature. However, there are few references which consider the impact of the high frequency behavior of the battery in the complete system performance. Moreover, to the best of authors' knowledge, there is no study considering these effects when the energy storage system is directly coupled to an SST port. This research will firstly obtain a parametric high frequency model of the battery cells, based on a vector fitting method in frequency domain. The model will be used for the estimation of the overall energy storage losses. Experimental results confirm the accuracy of the proposed model as well as the battery losses dependency on the switching frequency and the State of Charge (SoC)
Funding Information
  • Predoctoral Grants Program Severo Ochoa for the formation in research and university teaching of Principado de Asturias PCTI-FICYT (BP14-135, BP16-133)
  • Research, Technological Development and Innovation Program Oriented to the Society Challenges of the Spanish Ministry of Economy and Competitiveness (ENE2013-44245-R, ENE2016-77919-R)
  • European Union through ERFD Structural Funds (FEDER)

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