Making full use of wind power is one of the main purposes of the wind turbine generator control. Conventional hill climbing search （HCS） method can realize the maximum power point tracking （MPPT）. However, the ste...Making full use of wind power is one of the main purposes of the wind turbine generator control. Conventional hill climbing search （HCS） method can realize the maximum power point tracking （MPPT）. However, the step size of HCS method is constant so that it cannot consider both steady-state response and dynamic response. A fuzzy logical control （FLC） algorithm is proposed to solve this problem in this paper, which can track the maximum power point （MPP） quickly and smoothly. To evaluate MPPT algorithms, four performance indices are also proposed in this paper. They are the energy captured by wind turbine, the maximum power-point tracking time when wind speed changes slowly, the fluctuation magnitude of real power during steady state, and the energy captured by wind turbine when wind speed changes fast. Three cases are designed and simulated in MATLAB/Simulink respectively. The comparison of the three MPPT strategies concludes that the proposed fuzzy logical control algorithm is more superior to the conventional HCS algorithms.展开更多
通过对三值静态随机存储器(Static Random Access Memory,SRAM)单元和数据比较电路结构以及碳纳米场效应晶体管(Carbon Nanotube Field Effect Transistor,CNFET)的研究,提出了基于CNFET的三值内容寻址存储器单元设计方案。首先利用CNFE...通过对三值静态随机存储器(Static Random Access Memory,SRAM)单元和数据比较电路结构以及碳纳米场效应晶体管(Carbon Nanotube Field Effect Transistor,CNFET)的研究,提出了基于CNFET的三值内容寻址存储器单元设计方案。首先利用CNFET阈值可调特性和开关信号理论设计三值缓冲器,采用反馈控制连接技术实现三值SRAM存储;然后结合三值SRAM单元和三值逻辑原理设计三值内容寻址存储器单元;最后实验验证,所设计的三值内容寻址存储器单元具有正确的逻辑功能,且与三态内容寻址存储器单元相比功耗延时积(Power-Delay Product,PDP)降低约83%。展开更多
基金supported by the National High Technology Research and Development Program of China under Grant No.2011AA05S113Major State Basic Research Development Program under Grant No.2012CB215106+1 种基金Science and Technology Plan Program in Zhejiang Province under Grant No.2009C34013National Science and Technology Supporting Plan Project under Grant No.2009BAG12A09
文摘Making full use of wind power is one of the main purposes of the wind turbine generator control. Conventional hill climbing search （HCS） method can realize the maximum power point tracking （MPPT）. However, the step size of HCS method is constant so that it cannot consider both steady-state response and dynamic response. A fuzzy logical control （FLC） algorithm is proposed to solve this problem in this paper, which can track the maximum power point （MPP） quickly and smoothly. To evaluate MPPT algorithms, four performance indices are also proposed in this paper. They are the energy captured by wind turbine, the maximum power-point tracking time when wind speed changes slowly, the fluctuation magnitude of real power during steady state, and the energy captured by wind turbine when wind speed changes fast. Three cases are designed and simulated in MATLAB/Simulink respectively. The comparison of the three MPPT strategies concludes that the proposed fuzzy logical control algorithm is more superior to the conventional HCS algorithms.
文摘通过对三值静态随机存储器(Static Random Access Memory,SRAM)单元和数据比较电路结构以及碳纳米场效应晶体管(Carbon Nanotube Field Effect Transistor,CNFET)的研究,提出了基于CNFET的三值内容寻址存储器单元设计方案。首先利用CNFET阈值可调特性和开关信号理论设计三值缓冲器,采用反馈控制连接技术实现三值SRAM存储;然后结合三值SRAM单元和三值逻辑原理设计三值内容寻址存储器单元;最后实验验证,所设计的三值内容寻址存储器单元具有正确的逻辑功能,且与三态内容寻址存储器单元相比功耗延时积(Power-Delay Product,PDP)降低约83%。
