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“模块化UPS最优配置原则的探讨”的再探讨
作者:云易维  更新时间:2018-11-19

最近在UPS应用杂志上看到一篇文章“模块化UPS最优配置原则的探讨”,在这篇文章里,作者深入分析了当前联通公司的IDC定位,地市级IDC的主要特点,以及使用模块化2N-供电方案 和高频UPS N+1供电方案的比较。

北京云易维公司技术经理对这篇文章进行详细的剖析,抛砖引玉,希望有更多的技术大咖可以一起讨论中国IDC数据中心基础架构方案

一、联通公司IDC定位

  1. 联通IDC布局定位

联通IDC布局定位,要构建“集团级战略/核⼼基地+省级DC+地市DC/边缘节点”三级云数据中⼼体系,分层分级满⾜不同地域、不同类别客户业务需求,三级云数据中⼼⼀体化协同部署与运营,全⽹覆盖形成M(集团级)+1(省级中⼼)+N(地市级边缘)规划格局

  1. 地市级IDC的主要特点

背景:2015年,联通全国有PSTN机房退⽹,约有2300多个端局、6万多模块局需要退⽹改造,绝⼤多数PSTN端局集中在北⽅⼗省(占87%),其中省会城市约占27%。

定位:交换局房改造定为N类规划格局,定位于中、低端IDC机房,满⾜互联⽹及本地中⼩企业客户租赁机柜、带宽的需求,这些⽤户对机房要求低、价格敏感、属地化要求⾼。

特点:交换局房⼀般具有建设年代早、基础设施条件差、数量多、单局空余⾯积较⼩

选址: 联通集团关于DC局房改造局站的选取建议:

  • 优先选择建成年代较近的(不超过25年)

  • 建设标准较高(楼⾯活荷载不低于6kN/m2);

  • 抗震性能较好(框架、框剪结构)

  1. 为什么考虑模块化UPS
  • 技术层面 :其可靠性是否通过了技术验证;运维部⻔对模块化UPS系统使⽤安全模式的认可。

  • 商务层面:联通公司加⼤了投资效益的考核,且对改造DC局房所⾯对的⽤户层级进⾏了明确的定位(定位于T2-T3)

二、IDC实例的进一步思考

案例:在XX局IDC机房4F、5F各新增IDC机架190架,共计380架,本期按单机柜功耗按2kW计列、终期单机机柜功耗按3.3kW考虑进⾏电源⽅案配置。交流不间断电源及后备蓄电池组设备的容量按近期负荷配置,考虑远期负荷增加时可进⾏设备扩容以满⾜远期配置

  1. 设计依据:
  • UPS系统功率因数按0.9考虑

  • 通信局(站)电源系统维护技术要求第4部分:不间断电源(UPS)第4.3.6条规定:“对于N+l并联冗余系统,系统输出端的最⼤负载应不超过UPS容量×N×80%”。

  1. 计算过程:
  • 单机柜功率2kW,交流负载总功率需求760kW,本期需新建UPS容量为:760kW/0.9/0.8 =1055(kVA)

  • 终期单机柜功率3.3KW,交流负载总功率需求1254KW,最终需要UPS容量为1742KVA

备注:在这里,和作者的终期负载2111KVA有出入,根据后期模块化UPS配置4台500KVA UPS推测,应该是作者负载计算错误,导致后面高频UPS配置偏大。

  1. 高频UPS和模块化UPS配置的等级
  • 方案一:使用高频UPS N+1方案

采用400KVA高频机,按照2+1方案,每套UPS系统由3台400KVA UPS并联组成,3台UPS之间采用2+1冗余配置

在一期,1套UPS系统,给4F设备供电,另一套UPS系统给5F供电,负载率为35%

在终期,这2套UPS系统依然能够为总负载供电,负载率为58%

序号 设备规格型号 单位 单价(万元) 规模 投资估算(万元)
1 UPS主机-400KVA 21 6 126
2 UPS输出配电柜 5 6 30
3 UPS蓄电池组-500AH/384V 10 12 120
4         276
  • 方案二:使用2N-方案

采用500KVA UPS带载4F机柜的一侧,另一台500KVA UPS带载4F机柜的另一侧,

在一期:每台UPS使用7个模块,实现2个功率模块冗余,带载率在60%

在终期:每台UPS使用10个模块,实现3个功率模块冗余,带载率为70%

总体造价为272

方案一中使用的9台UPS,变成了6台,节省了资金的投入。

  1. 故障问题分析

以终期负载,分析可能出现的问题:

方案一:

  • 一台UPS整流器或逆变器故障:UPS会退出并机系统,另外两台UPS带全部负载,负载627KW,UPS系统720KW,负载率达到87%

  • 一台UPS旁路或充电电路故障:UPS会报警,但仍然工作在逆变状态

  • 一台UPS控制系统故障:UPS会退出并机系统,另外两台UPS带全部负载,负载率达到87%

  • 市电断电,一台UPS电池不能供电:另外两台UPS仍然会继续供电,但电池后备时间会缩短

方案二:

  • 一台UPS模块故障:一台UPS有3个冗余功率模块,在冗余范围内,UPS正常运行

  • 一台UPS智能模块故障:一台UPS有2个智能模块,在冗余范围内,UPS正常运行

  • 一台UPS旁路模块故障:UPS会报警,工作于正常模式

  • 内部通信系统故障:内部通信系统一般为双路通信,在冗余范围内会正常运行

  • 市电断电,一台UPS电池不能供电:该UPS停机,另外一台UPS因过载停机

通过上述分析,发现:

  • 方案一在有一台UPS出现故障的时候,UPS系统达到87%

  • 方案二要比方案一更要注重电池的日常维护,方案二的本质还是1+1增容并机,单机内部实现智能模块和功率模块冗余

  1. 电池后期新旧混接的问题

在一期和终期的规划中,电池也是分步进行增容的,但这中间会存在一个问题,就是新旧电池混接的问题。电池一般在4-5年进行更换,如果在这个时间点,相对来说还比较好,可以将电池全部更换就好。但如果业务在3年内,或者在6年以后增长到一定程度,需要进行电池增容的时候,如何面对新旧电池混接的问题?

  1. 电池承重问题

在这个案例的使用场景中,这么多的电池,承重将是不可避免要遇到的问题,考虑到当前局站特点,如何解决铅酸蓄电池的承重问题?

这种场景下,是否可以使用锂电池替代铅酸蓄电池?

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