Power Control Method for Reducing Circulating Current in Parallel Operation of DC Distribution System

  • Shin, Soo-Cheol (Dept. of Information and Communication Engineering, Sungkyunkwan University) ;
  • Lee, Hee-Jun (Dept. of Information and Communication Engineering, Sungkyunkwan University) ;
  • Kim, Young-Ho (Dept. of Information and Communication Engineering, Sungkyunkwan University) ;
  • Lee, Jung-Hyo (Dept. of Information and Communication Engineering, Sungkyunkwan University) ;
  • Lee, Taeck Kie (Dept. of Electrical Engineering, Hankyoung National University) ;
  • Won, Chung-Yuen (Dept. of Information and Communication Engineering, Sungkyunkwan University)
  • Received : 2013.05.27
  • Accepted : 2013.06.07
  • Published : 2013.09.01


In general, for a large power system like DC distribution system for buildings, several power converters are modularized for parallel operation. However, in parallel operation, inconsistency of parameters in each module causes circulating current in the whole system. Circulating current is directly related to loss, and, therefore, it is most important for the safety of the power system to supply the suitable current to each module. This paper proposes a control method to reduce circulating current caused during parallel operation. Accordingly, the validity of parallel operation system including response characteristics and normal state was verified by simulation and experiment result.


DC distribution;Circulating current;Parallel system;AC/DC converter;Dc/Dc converter;Power control


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