采用小型汽油发电机对UPS供电探讨

在UPS供电系统中,市电中断时间较短时,蓄电池的直流电能经逆变器转换后给交流负载供电.但是,蓄电池的容量有限,不能长时间供电,为了保证市电长时间停电后设备能够正常工作,必须采用发电机来进一步支持UPS,共同组成UPS/发电机组的完整的不间断供电系统.对使用小型发电机为UPS供电出现的问题进行探讨,并提供实际的使用例子.     

采用小型汽油发电机对UPS供电探讨

在UPS供电系统中，市电中断时间较短时，蓄电池的直流电能经逆变器转换后给交流负载供电。但是，蓄电池的容量有限，不能长时间供电，为了保证市电长时间停电后设备能够正常工作，必须采用发电机来进一步支持UPS，共同组成UPS／发电机组的完整的不间断供电系统。对使用小型发电机为UPS供电出现的问题进行探讨，并提供实际的使用例子。     

革命性的技术，革命性的选择（五）——免蓄电池磁悬浮飞轮储能UPS与发电机的配置

对于要求长时间不问断供电的应用系统及对供电安全要求较高的场合,为保证市电长时间停电后设备能够正常工作,在交流不停电供电系统中还必须配置发电机组,由配置的发电机组来进一步支持UPS。UPS和发电机组共同组成完整的不间断供电系统。     

基于数码交流发电机的不间断供电系统设计

针对用户对负载供电不间断的实际需求,分析了数码发电机的内部结构及其不能实现供电的不间断性能的原因,提出一种由数码发电机改造组成的交流不间断供电系统的设计方法.该设计利用发电机内部的逆变器,在市电正常时,由市电经过逆变器给负载供电,同时给蓄电池充电;在市电断电时,一边启动发电机,一边由蓄电池的直流电通过逆变器转换成交流电供负载使用,实现无论市电正常还是异常,系统对负载提供不间断电源.设计对市电进行稳压、稳频、输出零切换、蓄电池的充放电管理等新功能.此设计无需单独购买不间断电源,避免重复投资和资源浪费.     

直播机房UPS电源使用经验

1 UPS电源的选择UPS(UNINTERRUPTIBLE POWER SYSTEM)即不间断电源系统,当市电正常输入时,UPS就将市电稳压后供给负载使用,同时对机内电池充电,把能量储存在电池中,当市电中断(事故停电)或输入故障时,UPS立即将机内电池的能量转换为220 V交流电继续供负载使用,使负载维持正常工作并保护负载软硬件不受损坏。UPS电源包括两部分:UPS主机和蓄电池。按工作方式可分为后备式和在线式两种,后备式电源在市电正常供电时,市电通过交流旁路通道直接向负载供电,此时主机上的逆变器不工作,只是在市电停电时,才由蓄电池供电,经逆变器驱…     

能与柴油发电机更好配合的飞机UPS

在为重要负载供电时,如果用户必须使用柴油发电机与UPS相结合,为何不考虑飞轮UPS？众所周知,蓄电池组是UPS供电系统中最薄弱的环节,存在着诸多隐患。当下,飞轮UPS的技术已经非常成熟,飞轮所存储的能量足够来启动发电机,并提供不间断的电源,直到发电机启动为止。     

UPS系统和柴油发电机组接口问题探讨

UPS是为关键负载提供交流不间断电源的设备。市电正常时,UPS从市电获得能源,经过适当的电力变换和调节(最典型的是整流／逆变双变换),消除市电线路的各种干扰,从而为负载提供稳定可靠的交流电源。市电停电时,UPS利用内部蓄电池的储能,经逆变器不间断地供给负载稳定可靠的交流电源。但蓄电池的储能一般只能供电10～30min。对于市电长时间停电,虽然可以采用大容量蓄电池,但保护时间仍然是有限的,而且大容量蓄电池是十分昂贵的。目前国内外普遍认为,大、中功率的UPS系统采用大容量蓄电池并不是经济合理的方法,只有在非常特殊的情况下才推荐采用大容量蓄电池。     

UPS技术比较

概述 UPS发展概况 作为不间断电源的UPS自从伴随计算机诞生以来发展很快,开始的UPS只是带有一个大飞轮的电动机——发电机组,如七十年代英国的1900系列计算机就是由这样的原始UPS供电的,它的发电机上带有一个5吨重的飞轮,市电停电后该发电机可以维持正常供电数秒钟。后来又发展到直流电动机——发电机组,其供电时间可以通过驱动直流电动机的蓄电池容量的增加而延长。上面这种方式结构的     

微波站太阳电池和市电并行供电系统的设计方法

介绍了微波站采用太阳电池与市电并行供电的原理；并行供电系统中太阳电池和蓄电池用量的计算方法；以实例说明了并行供电系统中太阳电池和蓄电池用量明显地减少；最后，讨论了太阳电池与市电并行供电方式的结果。     

燃气轮机机组和柴油发电机组在超大型IDC机房的应用对比

对于IDC机房来说,安全、可靠的供电系统就是整个IDC机房的动力中心、是“心脏”,服务器在数据中心要能够长时间、稳定运行,供电系统一定要经过很周密的设计,除了采用双路市电供电外,还需配置发电机组做为后备电源,以及不间断电源系统UPS。     

磁悬浮飞轮储能设备在UPS系统中的应用研究

磁悬浮飞轮储能设备是指在磁悬浮真空环境下通过高速运转的飞轮来储存能量的装置,具有能耗低、无污染和寿命长等优点,在后备油机及高低压配电系统能快速响应的前提下可完全替代铅酸蓄电池作为UPS系统的新型后备电源。目前,该技术及产品在国外大型数据中心应用广泛,但在国内还比较少见。随着我国通信行业特别是数据中心节能减排问题提上日程,飞轮储能设备将在中国数据中心建设中大显身手。文中通过搭建一套由后备油机、高低压配电设备、UPS主机、飞轮设备及假负载组成的供电系统进行实地联动测试,并分析了在UPS供电系统中利用飞轮设备替代铅酸蓄电池的可行性,最后给出了该技术和产品在中国推广应用的一些建议。     

固定型阀控式密封铅酸蓄电池的应用

蓄电池在供电系统中主要是作为储能设备,当外部交流供电突然中断时,作为系统供电的后备保护．为通信设备的正常工作提供保障。在我站的-48V直流供电系统中,两组蓄电池组可提供大约40小时的不停电供电电源,在交流不间断供电系统（UPS）中,蓄电池可提供5小时的不间断供电电源,以维持正常的通信。     

Performance of a single-stage UPS system for single-phasetrapezoidal-shaped AC-voltage supplies

A high-performance single-stage UPS system for single-phase AC power supply systems is presented. The topology generates a trapezoidal-shaped load voltage that is synchronized with the AC supply; therefore, a small DC-link capacitor is required. This feature leads to a high-input power factor (0.94 at nominal voltage), and due to the single-stage structure, high efficiency (93% at nominal voltage) is also achieved. Moreover, in both cases the supply current spectrum presents low-order harmonics, all of which satisfy IEC 555. The high performance is validated using both resistive (linear) and diode RC (nonlinear) loads. The dynamic performance of the UPS system is also analyzed under different transient conditions. Specifically, the supply to battery, battery to supply transition, load transient, and supply/battery-voltage transients are performed. They show a transfer time of 500 μs (from AC supply to battery) and overvoltages of at most 15%. The dynamic and static evaluations are performed on a 1 kVA UPS system. The design guidelines for the key components and control parameters are also included     

A new UPS topology employing a PFC boost rectifier cascadedhigh-frequency tri-port converter

A new uninterruptible power supply (UPS) topology using the high-frequency tri-port UPS technique is proposed which presents the advantages of no-break power, low cost, input unity power factor, high power density, and high power conversion efficiency. Through the proposed circuit configuration, charging concept, and control strategy, the battery management is easily obtained by controlling the output voltage of the power-factor-correction (PFC) converter, which results in no additional power device being required for charging. The implementing circuit of the charging method is submitted to perform the two-stage charging, constant current charging, and constant voltage charging. The proposed technologies can be applied to the switching power supply with built-in UPS function featuring a low-cost solution for computer equipment, Finally, an experimental AC online UPS is built to verify the proposed concept, analysis, and control strategy     

成都地铁一号线通信UPS电源系统简述

成都地铁1号线通信UPS电源系统由配电系统、UPS系统、集中监控系统、蓄电池组、接地装置构成。文中论述了该电源系统各组成部分及功能。     

High-Performance Transformerless Online UPS

In this paper, a high-performance single-phase transformerless online uninterruptible power supply (UPS) is proposed. The proposed UPS is composed of a four-leg-type converter, which operates as a rectifier, a battery charger/discharger, and an inverter. The rectifier has the capability of power-factor collection and regulates a constant dc-link voltage. The battery charger/discharger eliminates the need for the transformer and the increase of the number of battery and supplies the power demanded by the load to the dc-link capacitor in the event of the input-power failure or abrupt decrease of the input voltage. The inverter provides a regulated sinusoidal output voltage to the load and limits the output current under an impulsive load. The control of the dc-link voltage enhances the transient response of the output voltage and the utilization of the input power. By utilizing the battery charger/discharger, the overall efficiency of the system is improved, and the size, weight, and cost of the system are significantly reduced. Experimental results obtained with a 3-kVA prototype show a normal efficiency of over 95.6% and an input power factor of over 99.7%.      

UPS电源在中波发射台的运用研究

不间断电源(Uninterruptible Power System,UPS)是当前广播发射台供电系统中不可缺少的组成部分,在处理电台突发断电状况、保护广播电视安全传输发射方面发挥着重要作用。随着UPS电源越来越多的配备到了中波发射台站中,如何管理和维护好UPS电源系统是一项重要工作。文中首先对UPS电源进行介绍,其次分析了UPS电源在717台的应用现状,最后对UPS电源的检修维护给出了相应的策略。     

A novel on-line UPS with universal filtering capabilities

A novel line-interactive uninterruptible power supply (UPS) is proposed that offers the characteristics of an “on-line” or “inverter-preferred” UPS (which incorporates a pulse-width modulation (PWM) rectifier) at a reduced cost. This new UPS is based on the combination of two full-bridge VSI converters: one in series with the input and the other in parallel with the load. The UPS acts as a line conditioner and output-voltage stabilizer in the presence of input power while charging the battery at a controlled rate. In case of loss of input power, the UPS can make a seamless transition to backup mode while supplying the load with a controlled sinusoidal voltage, drawing power from the battery. The series converter sees only a small percentage of the input voltage (typically, 10%-20%) while carrying the input current and therefore has a small kilovoltampere rating. The parallel converter supplies the load during blackout and hence determines the total kilovoltampere rating of the UPS. The reduced kilovoltampere rating of the series converter results in reduced system cost compared to conventional on-line systems without sacrificing any desirable characteristics. A laboratory version of the proposed UPS has been built to demonstrate the claimed capabilities, and both simulation and experimental results are included in the paper     

不间断电源电气性能测试技术

通信电源是整个通信系统的＂心脏＂。交流不间断电源（UPS,Uninterruptible Power Supply）能够在交流输入突然切断时,通过后备电池继续保证高质量的交流供电。为了提高供电质量,保证通信网络的良好运行,必须对UPS电源设备的各种电气参数进行定期测量,以便及时了解设备的运行状况,调整不利于设备运行的参数。文中介绍了不间断电源（UPS）的工作原理,对其主要电气性能测试方法进行了详细论述。