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STEADY-STATE OPTIMIZATION OF AN INTERNAL COMBUSTION ENGINE FOR HYBRID ELECTRIC VEHICLES
Wang, F.,Zhang, T.,Yang, L.,Zhuo, B. The Korean Society of Automotive Engineers 2007 International journal of automotive technology Vol.8 No.3
In previous work, an approach based on maximizing the efficiency of an internal combustion engine while ignoring the power conversion efficiency of other powertrain components, such as the electric motor and power battery or ultracapacitor, was implemented in the steady-state optimization of an internal combustion engine for hybrid electric vehicles. In this paper, a novel control algorithm was developed and successfully justified as the basis for maximal power conversion efficiency of overall powertrain components. Results indicated that fuel economy improvement by 3.9% compared with the conventional control algorithm under China urban transient-state driving-cycle conditions. In addition, using the view of the novel control algorithm, maximal power generation of the electric motor can be chosen.
STEADY-STATE OPTIMIZATION OF AN INTERNAL COMBUSTION ENGINE FOR HYBRID ELECTRIC VEHICLES
F. WANG,T. ZHANG,L. YANG,B. ZHUO 한국자동차공학회 2007 International journal of automotive technology Vol.8 No.3
In previous work, an approach based on maximizing the efficiency of an internal combustion engine while ignoring the power conversion efficiency of other powertrain components, such as the electric motor and power battery or ultracapacitor, was implemented in the steady-state optimization of an internal combustion engine for hybrid electric vehicles. In this paper, a novel control algorithm was developed and successfully justified as the basis for maximal power conversion efficiency of overall powertrain components. Results indicated that fuel economy improvement by 3.9% compared with the conventional control algorithm under China urban transient-state driving-cycle conditions. In addition, using the view of the novel control algorithm, maximal power generation of the electric motor can be chosen.
Research of Seamless Transfer Control Strategy of Microgrid System
M.J. Yang,F. Zhuo,X.W. Wang,H.P. Guo,Y.J. Zhou 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Microgrid has two typical working modes: grid-connected mode and islanded mode. The transfer between these two modes should be seamless. In a microgrid that uses master-slave strategy to avoid circumfluence in the islanded mode, to control the master converter’s voltage is to control the microgrid voltage. Considering this, the master converter in this paper works as a voltage-controlled inverter when the microgrid is disconnecting from the utility grid while working as a current-controlled rectifier when the microgrid is in the grid-connected mode. Besides, by gradually adjusting the master converter’s output voltage to equal that of the utility grid when the microgrid is going to connect the utility grid and by setting an appropriate initial phase of the converter voltage when the microgrid needs to work alone, the seamless transfers between these two modes are accomplished. Experiment has been done to validate the accuracy, rapidity and reliability of this strategy.