Since the raising of the cloud computing, the applications of web service have been extended rapidly. However, the data centers of cloud computing also cause the problem of power consumption and the resources usually ...Since the raising of the cloud computing, the applications of web service have been extended rapidly. However, the data centers of cloud computing also cause the problem of power consumption and the resources usually have not been used effectively. Decreasing the power consumption and enhancing resource utilization become main issues in cloud computing environment. In this paper, we propose a method, called MBFDP （modified best fit decreasing packing）, to decrease power consumption and enhance resource utilization of cloud computing servers. From the results of experiments, the proposed solution can reduce power consumption effectively and enhance the utilization of resources of servers.展开更多
In order to improve the working efficiency of the power battery pack and prolong the service life, there is a problem of inconsistency among the individual cells. Based on the centralized equalization structure of the...In order to improve the working efficiency of the power battery pack and prolong the service life, there is a problem of inconsistency among the individual cells. Based on the centralized equalization structure of the multi-output winding transformer, a three-stage hybrid equalization control strategy is designed for equalization. The equalization scheme realizes that the high voltage single battery transfers the energy to the low voltage battery cell during the charging of the battery pack, improving not only charging efficiency and energy use loss, but also the high voltage battery transferring the power to the low voltage battery cell when the pressure difference is greater than 10 mv during the discharge. Between 5 mv and 10 mv, it performs passive equalization, reducing the output fluctuation of the power battery pack and achieving the balance purpose. During the standing time, the maximum active balancing operation within the battery pack is performed in order to achieve intra-group optimum consistency. It is proved by experiments that the equalization control method can realize the quick and effective equalization in the battery pack, and the energy balance of each single battery.展开更多
为了解决在役核电厂因空间受限无法实施1E级蓄电池组扩容的问题,研究设计了一种磷酸铁锂蓄电池组样机。考虑行业尚无针对磷酸铁锂蓄电池组的1E级鉴定标准或规范,研究并建立了磷酸铁锂蓄电池组1E级鉴定方法和流程。该方法和流程遵循压水...为了解决在役核电厂因空间受限无法实施1E级蓄电池组扩容的问题,研究设计了一种磷酸铁锂蓄电池组样机。考虑行业尚无针对磷酸铁锂蓄电池组的1E级鉴定标准或规范,研究并建立了磷酸铁锂蓄电池组1E级鉴定方法和流程。该方法和流程遵循压水堆核电厂核岛电气设备设计和建造规则(Design and Construction rules for Electrical and I&C Systems and Equipment,简称RCC-E)关于K3类电气设备1E级鉴定基本流程,包含基准试验、老化试验、极限性能试验和抗震试验四个阶段试验内容。经过1E级鉴定试验验证,表明该磷酸铁锂蓄电池组样机符合1E级鉴定要求。研究结果表明,该磷酸铁锂蓄电池组设计上符合1E级蓄电池组设备鉴定要求,其体积能量密度从原30~50 Wh/L提升至约160 Wh/L。该成果可解决受限空间1E级蓄电池组无法扩容的问题,也为行业1E级蓄电池组能量密度提升提供了参考。展开更多
文摘Since the raising of the cloud computing, the applications of web service have been extended rapidly. However, the data centers of cloud computing also cause the problem of power consumption and the resources usually have not been used effectively. Decreasing the power consumption and enhancing resource utilization become main issues in cloud computing environment. In this paper, we propose a method, called MBFDP （modified best fit decreasing packing）, to decrease power consumption and enhance resource utilization of cloud computing servers. From the results of experiments, the proposed solution can reduce power consumption effectively and enhance the utilization of resources of servers.
文摘In order to improve the working efficiency of the power battery pack and prolong the service life, there is a problem of inconsistency among the individual cells. Based on the centralized equalization structure of the multi-output winding transformer, a three-stage hybrid equalization control strategy is designed for equalization. The equalization scheme realizes that the high voltage single battery transfers the energy to the low voltage battery cell during the charging of the battery pack, improving not only charging efficiency and energy use loss, but also the high voltage battery transferring the power to the low voltage battery cell when the pressure difference is greater than 10 mv during the discharge. Between 5 mv and 10 mv, it performs passive equalization, reducing the output fluctuation of the power battery pack and achieving the balance purpose. During the standing time, the maximum active balancing operation within the battery pack is performed in order to achieve intra-group optimum consistency. It is proved by experiments that the equalization control method can realize the quick and effective equalization in the battery pack, and the energy balance of each single battery.
文摘为了解决在役核电厂因空间受限无法实施1E级蓄电池组扩容的问题,研究设计了一种磷酸铁锂蓄电池组样机。考虑行业尚无针对磷酸铁锂蓄电池组的1E级鉴定标准或规范,研究并建立了磷酸铁锂蓄电池组1E级鉴定方法和流程。该方法和流程遵循压水堆核电厂核岛电气设备设计和建造规则(Design and Construction rules for Electrical and I&C Systems and Equipment,简称RCC-E)关于K3类电气设备1E级鉴定基本流程,包含基准试验、老化试验、极限性能试验和抗震试验四个阶段试验内容。经过1E级鉴定试验验证,表明该磷酸铁锂蓄电池组样机符合1E级鉴定要求。研究结果表明,该磷酸铁锂蓄电池组设计上符合1E级蓄电池组设备鉴定要求,其体积能量密度从原30~50 Wh/L提升至约160 Wh/L。该成果可解决受限空间1E级蓄电池组无法扩容的问题,也为行业1E级蓄电池组能量密度提升提供了参考。
