Load dispatching control of multiple-parallel-converters rectifier to maximize conversion efficiency

Dai Orihara, Hiroumi Saitoh, Yuji Higuchi, Tadatoshi Babasaki

Research output: Contribution to journalArticlepeer-review


In the context of increasing electric energy consumption in a data center, energy efficiency improvement is strongly emphasized. In a data center, electric energy is largely consumed by DC power supply system, which is based on a rectifier composed by multiple parallel converters. Therefore, rectifier efficiency must be improved for minimizing loss of DC power supply system. Rectifier efficiency can be modulated by load allocation to converters because converter efficiency depends on input AC power. In this paper, we propose a new control method to maximize rectifier efficiency. The method can control load allocation to converters by introducing active power converter control scheme and start-and-stop of converters. In order to illustrate optimal load allocations in a rectifier, a maximization problem of rectifier efficiency is formulated as a nonlinear optimization one. The problem is solved by Lagrangian relaxation method and the computation results provide the validity of proposed method.

Original languageEnglish
Pages (from-to)1132-1136
Number of pages5
JournalJournal of Electrical Engineering and Technology
Issue number3
Publication statusPublished - 2014 May


  • DC power supply
  • Data center
  • Energy efficiency
  • Load allocation
  • Parallel converters


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