Design of an Input-Parallel Output-Parallel LLC Resonant DC-DC Converter System for DC Microgrids

Y. L. Juan, T. R. Chen, H. M. Chang, S. E. Wei

Research output: Contribution to journalConference articlepeer-review


Compared with the centralized power system, the distributed modularized power system is composed of several power modules with lower power capacity to provide a totally enough power capacity for the load demand. Therefore, the current stress of the power components in each module can then be reduced, and the flexibility of system setup is also enhanced. However, the parallel-connected power modules in the conventional system are usually controlled to equally share the power flow which would result in lower efficiency in low loading condition. In this study, a modular power conversion system for DC micro grid is developed with 48 V dc low voltage input and 380 V dc high voltage output. However, in the developed system control strategy, the numbers of power modules enabled to share the power flow is decided according to the output power at lower load demand. Finally, three 350 W power modules are constructed and parallel-connected to setup a modular power conversion system. From the experimental results, compared with the conventional system, the efficiency of the developed power system in the light loading condition is greatly improved. The modularized design of the power system can also decrease the power loss ratio to the system capacity.

Original languageEnglish
Article number012101
JournalIOP Conference Series: Earth and Environmental Science
Issue number1
Publication statusPublished - 2017 Nov 28
Event2017 3rd International Conference on Energy, Environment and Materials Science, EEMS 2017 - Singapore, Singapore
Duration: 2017 Jul 282017 Jul 30

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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