Power and energy management of grid/PEMFC/battery/supercapacitor hybrid power sources for UPS applications

This paper presents a hybrid power and energy source supplied by a proton exchange membrane fuel cell (PEMFC) as the main power source in an uninterruptible power supply (UPS) system. To prevent the PEMFC from fuel starvation and degradation and realize their seamless linking in the hybrid UPS system, the power and energy are balanced by the battery and/or supercapacitor (SC) as two alternative auxiliary power sources. Based on the modeling and sizing of hybrid power and energy components, the power and energy management strategies and efficiency measurements of four operating modes in UPS system are proposed. To evaluate the proposed strategies, an experimental setup is implemented by a data acquisition system, a PEMFC generating system, and a UPS system including AC/DC rectifier, DC/AC inverter, DC/DC converter, AC/DC recharger and its intelligent control unit. Experimental results with the characteristics of a 300 W self-humidified air-breathing of PEMFC, 3-cell 12 V/5 Ah of batteries, and two 16-cell 120 F/2.7 V of SCs in parallel corroborate the excellent management strategies in the four operating modes of UPS system, which provides the basis for the optimal design of the UPS system with hybrid PEMFC/battery/SC power sources.     

基于DSP的不间断应急电源控制系统研究

针对电源系统的高要求性,以通信基站的电源系统作为研究基础提出一种基于数字信号处理器(DSP)的不间断应急电源(UPS)控制系统。利用DSP TMS320F2812实现了不间断应急电源系统闭环电压调节以及实现与市电同步的控制,可以有效提高系统工作效率与稳定性。     

浅析UPS不可间断电源在防空地下室中的应用

本文根据防空地下室的特殊性及其施工设计技术,提出了一种在防空地下室配电系统中加入UPS不可间断电源的方案,结合实际工程案例,验证了该方案的可行性和优越性,其不仅节约了工程成本,而且提高了防空地下室电气系统运行的连续性、可靠性和稳定性。     

UPS输出端中性线接地问题探讨

从UPS工作原理入手,分析单相UPS和三相UPS“另起的系统”的接地问题,结论：UPS输出端的中性线做重复接地的规定有误。     

UPS 蓄电池容量的选择方法

根据负载特性和容量选择合适的蓄电池组容量对于降低UPS的成本,保证不间断供电的可靠性尤为重要。本文通过能量平衡、电压匹配原理介绍一种简单易行的蓄电池容量和数量选择的计算方法。     

长江三峡左岸电站UPS系统运行分析与风险处置

介绍了长江三峡水电站UPS系统设置的目的、工作原理及其组成,指出了UPS电源在水电站运行中可能存在的风险,提出了处置办法和预防措施。     

Regulation of TRAIL-Receptor Expression by the Ubiquitin-Proteasome System

The tumor necrosis factor (TNF)-related apoptosis-inducing ligand- receptor (TRAIL-R) family has emerged as a key mediator of cell fate and survival. Ligation of TRAIL ligand to TRAIL-R1 or TRAIL-R2 initiates the extrinsic apoptotic pathway characterized by the recruitment of death domains, assembly of the death-inducing signaling complex (DISC), caspase activation and ultimately apoptosis. Conversely the decoy receptors TRAIL-R3 and TRAIL-R4, which lack the pro-apoptotic death domain, function to dampen the apoptotic response by competing for TRAIL ligand. The tissue restricted expression of the decoy receptors on normal but not cancer cells provides a therapeutic rational for the development of selective TRAIL-mediated anti-tumor therapies. Recent clinical trials using agonistic antibodies against the apoptosis-inducing TRAIL receptors or recombinant TRAIL have been promising; however the number of patients in complete remission remains stubbornly low. The mechanisms of TRAIL resistance are relatively unexplored but may in part be due to TRAIL-R down-regulation or shedding of TRAIL-R by tumor cells. Therefore a better understanding of the mechanisms underlying TRAIL resistance is required. The ubiquitin-proteasome system (UPS) has been shown to regulate TRAIL-R members suggesting that pharmacological inhibition of the UPS may be a novel strategy to augment TRAIL-based therapies and increase efficacies. We recently identified b-AP15 as an inhibitor of proteasome deubiquitinase (DUB) activity. Interestingly, exposure of tumor cell lines to b-AP15 resulted in increased TRAIL-R2 expression and enhanced sensitivity to TRAIL-mediated apoptosis and cell death in vitro and in vivo. In conclusion, targeting the UPS may represent a novel strategy to increase the cell surface expression of pro-apoptotic TRAIL-R on cancer cells and should be considered in clinical trials targeting TRAIL-receptors in cancer patients.     

大功率UPS传导干扰现场测试方法探讨

阐述UPS传导干扰的产生机理及危害,通过使用电压探针、电流探针、功率探针和电能质量分析仪的测试,对大功率UPS传导干扰的现场测试方法进行了探讨,对现场安装完成的大功率UPS的传导干扰水平进行评估。     

对测试库房UPS供电系统接地的方案设计

概述了各种接地制式的低压配电系统,指出它们的应用范围。根据测试库房实际要求设计合理的接地系统,有效净化了UPS的供电环境,提高了供电的安全性。     

通信机房UPS主机原位不断电更换割接方案研究

本文主要通过对通信机房UPS供电系统结构的分析,结合实际改造工程经验,对UPS电源供电系统设备更换割接进行技术方面的研究,给出UPS电源设备不断电割接技术方案,为工程设计、施工的割接方案编制提供参考.