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Load Dispatching Control of Multiple-Parallel-Converters Rectifier to Maximize Conversion Efficiency
Dai Orihara,Hiroumi Saitoh,Yuji Higuchi,Tadatoshi Babasaki 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.3
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.
Load Dispatching Control of Multiple-Parallel-Converters Rectifier to Maximize Conversion Efficiency
Orihara, Dai,Saitoh, Hiroumi,Higuchi, Yuji,Babasaki, Tadatoshi The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.3
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.
A New High Performance Auto-Tuning Digital Control Circuit for Buck-Boost Converter
Fujio Kurokawa,Taku Ishibashi,Yoshihiko Komichi,Tadatoshi Babasaki 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The purpose of this paper is to present the dynamic characteristics of the new high performance autotuning digital control circuit for buck-boost converter when the step change of the load resistance R from 20 Ω to 10Ω. The buck-boost dc-dc converter is used with wide input voltage changing. At the same time, the suitable proportional gain and bias value are changing against the input voltage and the load resistance of the converter. So, we took two methods that changing proportional gain automatically and changing bias value against the input voltage, the load resistance and the loss of the converter. As a result, using this proposed method it is revealed that not only the dynamic characteristic but also regulation characteristic can be improved and it is effective for wide range input voltage. Especially, the steady-state error is improved from 470㎷ to 50㎷ when the input voltage is 5V, 700㎷ to 40㎷ when the input voltage is 15V, respectively.
K. Asakura,J. Inamori,K. Murai,T. Tanaka,T. Babasaki 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper describes the fuse-blowing characteristics for higher-voltage direct current (HVDC) power feeding systems. We developed a new fuse model, and evaluated the fuse-blowing characteristics and the effect of cable length. From the results, the electrical stability of HVDC power feeding system when a shorting accident or an overcurrent occurs is discussed.