This paper documents design and modeling of a grid-connected emergency back-up power supply for medium power applications. Back-up power supplies are very important in regard to support electrical loads in the events ...This paper documents design and modeling of a grid-connected emergency back-up power supply for medium power applications. Back-up power supplies are very important in regard to support electrical loads in the events of grid power outage. However, grid-integration of a back-up power supply substantiates continual power transfer to the loads, especially to the critical loads, which should not suffer from power interruptions. Therefore, design and circuit modeling of switching converters based reliable grid-tied emergency back-up power supply are presented in this paper. There are a rectifier-link boost derived battery charging circuit and a 4-switch push-pull power inverter circuit which are controlled by high frequency pulse width modulation (PWM) signals. This paper presents a state averaging model and Laplace domain transfer function of the charging circuit and a switching converter model of the power inverter circuit. A changeover relay based transfer switch controls the power flow towards the utility loads. During off-grid situations, loads are fed power by the proposed inverter circuit and during on-grid situations, battery is charged by an ac-link rectifier-fed boost converter. However, there is a relay switching circuit to control the charging phenomenon of the battery. The proposed design is simulated in PLECS and the simulation results corroborate the reliability of the presented framework.展开更多
企业实现信息通讯和资源共享时,网络安全是企业生存和发展的重要因素。采用了先进技术对系统安全进行强化和补充,尤其采用了最先进的存储区域网络技术(storage area network,SAN)和数据备份及灾难恢复技术中的自动修复计算机(automatica...企业实现信息通讯和资源共享时,网络安全是企业生存和发展的重要因素。采用了先进技术对系统安全进行强化和补充,尤其采用了最先进的存储区域网络技术(storage area network,SAN)和数据备份及灾难恢复技术中的自动修复计算机(automatically repaired computer,ARC)技术,为企业构建了一个完整的安全体系,加强了灾难的预防和恢复措施。该系统在油田的采油企业实施,极大地提高了信息系统安全性能。该方法对我国其他企业也有较好的借鉴价值。展开更多
文摘This paper documents design and modeling of a grid-connected emergency back-up power supply for medium power applications. Back-up power supplies are very important in regard to support electrical loads in the events of grid power outage. However, grid-integration of a back-up power supply substantiates continual power transfer to the loads, especially to the critical loads, which should not suffer from power interruptions. Therefore, design and circuit modeling of switching converters based reliable grid-tied emergency back-up power supply are presented in this paper. There are a rectifier-link boost derived battery charging circuit and a 4-switch push-pull power inverter circuit which are controlled by high frequency pulse width modulation (PWM) signals. This paper presents a state averaging model and Laplace domain transfer function of the charging circuit and a switching converter model of the power inverter circuit. A changeover relay based transfer switch controls the power flow towards the utility loads. During off-grid situations, loads are fed power by the proposed inverter circuit and during on-grid situations, battery is charged by an ac-link rectifier-fed boost converter. However, there is a relay switching circuit to control the charging phenomenon of the battery. The proposed design is simulated in PLECS and the simulation results corroborate the reliability of the presented framework.
文摘企业实现信息通讯和资源共享时,网络安全是企业生存和发展的重要因素。采用了先进技术对系统安全进行强化和补充,尤其采用了最先进的存储区域网络技术(storage area network,SAN)和数据备份及灾难恢复技术中的自动修复计算机(automatically repaired computer,ARC)技术,为企业构建了一个完整的安全体系,加强了灾难的预防和恢复措施。该系统在油田的采油企业实施,极大地提高了信息系统安全性能。该方法对我国其他企业也有较好的借鉴价值。
