How to make sure the UPS system never stops and the network always online

With the rapid growth of Enterprise http://www.aliyun.com/zixun/aggregation/11969.html > Internet application, the importance of data center is further enhanced--the data center is no longer the data itself, but the core business of the enterprise. , and its reliability is the key to ensure the efficient operation of enterprise core business. Data center system to maintain a stable operation, power supply is the basis to ensure that UPS power supply reliability has become the focus of the problem.

How to make sure that the UPS system never stops, so that the network "forever online"? This may be the industry's eternal theme – demand has been challenging technology, and applications are always driving innovation. At present, in the UPS application there are several points to pay attention to, first of all, the frequency of the machine and High-frequency machine selection. In this respect, people have a misunderstanding, often think high-frequency is good, high-frequency machine is superior to the frequency machine, in fact, power frequency ups and high frequency ups can not be isolated analysis, should be seen from the specific application.

In response to this issue, China Telecom and Telecommunications Institute of Power Supply Department of senior engineer Hou Yongtao has done a special analysis, pointed out in two important aspects of the advantages of the frequency machine: 1 reliability, 2 load on the 0 voltage requirements. On the one hand, the frequency machine uses SCR SCR rectifier, mature technology, strong resistance to current impact. As SCR is a half-control device, there will be no direct, false trigger and other failures, compared to the high-frequency machine used IGBT high frequency rectifier, although the switching frequency is high, but the IGBT work with a strict voltage, current work area, low impact resistance. Therefore, the IGBT rectifier is lower than the SCR rectifier in terms of overall reliability.

On the other hand, the high-power three-phase high-frequency machine 0 line will be introduced into the rectifier and as the neutral point of positive and negative bus, this structure will inevitably cause rectifier and inverter high-frequency harmonic coupling on the 0 line, lifting 0 voltage, resulting in 0 of the load end voltage elevation, it is difficult to meet IBM, HP and other server manufacturers to 0 ground voltage less than 1V site requirements. In addition, in the mains and generator switching process, high-frequency machine is often due to the loss of 0 lines and must be bypass work, under specific conditions can cause a heavy load flash fault; the power frequency machine because the rectifier does not need 0 lines to participate in, in the 0 line disconnect, UPS can maintain the normal supply.

From the structural point of view, the difference between ups and high-frequency machine UPS is mainly in isolating transformer, and the use of power frequency machine to isolating transformer greatly improves the reliability of UPS. From the comprehensive performance aspect, the frequency machine and the high-frequency machine each has the superiority and disadvantage, at least at present, does not exist who replaces who the question. In the process of purchasing equipment, customers should be based on their own actual needs, rather than blindly follow others. For example, companies want to build large data centers, then the requirements for reliability and stability should be placed in the first place, high-power power frequency machine ups should be the preferred, if it is the general office space Applications, or mainly take into account the use of the equipment, you can consider high-frequency machine ups.

Unlike other devices, as a key system to ensure the quality of power supply and continuity of power supply, the UPS demand for reliability is "never-ending", and UPS's own performance "unlimited Upgrade" has been unable to meet the needs of the application, redundant "device Backup" configuration design. In other words, in order to make the network as much as possible to obtain "100% high availability", it must be in the entire UPS redundant power supply system to eliminate the possibility of single point "bottleneck" hidden trouble, it is necessary in the entire UPS power supply system, from the High-voltage input transformer low-voltage side/ The redundant input power of the standby generator, until it is delivered to the input end of the end-user device, must take the necessary redundancy design and configuration in order to obtain sufficient "fault-tolerant" functionality. For the above reasons, some equipment manufacturers in key applications to provide customers with a dual-bus power supply program, a manufacturer of redundant "dual-bus output" type power supply system can make critical load power supply reliability of 99.99999%.

In fact, for the reliability of the computer room, power supply itself has been unable to consider in isolation, the computer room power supply and environment, including infrastructure management and monitoring more and more become a inseparable whole, as the basis of all specific technology and business applications, this system needs relatively independent and unified planning and construction. If there is no consistent thought, whether the power equipment or other infrastructure systems are in line with the growth of the core business and phased input, decentralized procurement, resulting in the machine room infrastructure brand, equipment diversity, resulting in system compatibility problems and maintenance difficulties, will inevitably reduce the overall reliability of the room, and ultimately bring security risks.

Visible, based on ups to build a highly reliable power supply system is far from the purchase of several devices so simple, it needs to inspect the performance of equipment, on-demand configuration of power supply system. For device providers, you need to have a deep understanding of the data Center application and customer needs, the need to have the power supply and even the entire infrastructure system aspects of the technology and expertise, to provide power distribution, refrigeration, infrastructure management and other aspects of the full range of products, to design a reasonable overall solution for customers, At the same time provide efficient technical support and maintenance, only so that can more effectively ensure the reliability and availability of the system, so that the room "never downtime", so that the network "forever online."