Early applications in the data center UPS power supply solutions are mostly stand-alone program or UPS in series program, there is a single point of failure output bottlenecks, now there is no way to completely solve it?
With the rapid development of business, IDCs and other data centers have gradually raised the importance and usability requirements of the business. In the past, the availability requirements for power supply systems were 99.9% ~ 99.999%. The solutions used were single-UPS work or serial UPS work or N + 1 work in parallel. 99.9% ~ 99.999% of the availability, the average annual time available for 8.76 hours to 5.3 minutes, apparently this failure time can not meet the current IDC and other data center requirements. In order to improve the availability of the data center, the reliability of the UPS power supply must be raised and the availability of the UPS power supply system must be completely raised. In the UPS stand-alone power supply scheme, or UPS series scheme, or UPS parallel scheme, there is a single point of failure output bottlenecks.
Research by IDC in the United States shows that the most important factor that affects the reliability of power supply in UPS power supply lies in the power distribution system output, including switch tripping, fuse burnout, short circuit and other power supply circuit failure: 79% comes from between UPS output and load 11% from UPS and battery packs; 10% from other failures; 10% from UPS and battery packs; %.
Emerson is a provider of end-to-end solutions for network energy. Especially in China, Emerson introduced dual-bus power supply system solutions as early as 1999 to provide highly reliable power supply solutions for IDC data centers in China.
Bank of China Tower - Headquarter of Bank of China The main office building is also home to the Bank Computer Center of Bank of China. It is a modern, intelligent building with fully automated management of the entire building. The project from the initial design to put into operation in May 2001 lasted three years, the entire system uses more than 140 sets of special ethylene glycol cooling room dedicated air-conditioning, four 7400 series 400KVA-12 pulse UPS system, 18 PPC and Other supporting equipment.
Huawei IDC Center - The largest UPS system of all brands in the Asia-Pacific region, with 6 800KVA and two 600KVA computer rooms put into operation in 2001. It is the largest UPS system in the Asia Pacific region at present. The total machine room area of ​​over 10,000 square meters.
Now, in order to solve the failure of the distribution circuit, it is necessary to configure the power supply of servers and other equipment into N + X redundant power supply systems, such as the 1 + 1 power supply module. Server power redundancy is generally equipped with two or more hot-swappable power supplies. During normal operation, each power supply outputs an average of a part of power, so that each power supply is in a relaxed load condition, which is conducive to stable power supply. If one of them fails, the other will take over the work of the server without any influence and alert by light or sound. At this point, you can replace the damaged power supply without shutting down the system, so the use of hot-swappable redundant power supply system to avoid damage caused by power down phenomenon.
In line with the server power supply configuration, the best IDC data center power supply scheme should be dual UPS power supply system composed of dual bus, to solve the power supply loop single point of failure bottlenecks.
Obviously, this dual-UPS dual-bus power supply system, with the server and other equipment to achieve the best dual redundant power supply, while completely solve the power supply of 79% of the probability of failure. In addition, dual-UPS dual-bus UPS power supply system to achieve the system can be online expansion, online maintenance and other requirements.
For single power equipment such as network switches, the STS is powered by the static switch STS. When one UPS or loop fails, the STS seamlessly switches to another UPS power supply loop, and also provides a dual power supply for a single power supply.
In large data centers, to ensure availability 99.99999%, full redundancy is used for all loops / devices between mains input and load input.
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