Shulou(Shulou.com)06/01 Report--

In recent years, with the deepening of people's understanding of the important role of the data center, the data center has developed rapidly both in terms of construction scale and development speed. however, the title of "large energy consumption" also makes the data center fall into a little helplessness and sigh. Nowadays, the energy problem has risen to the world level, and energy saving and consumption reduction has become an important index to measure whether a data center is successful or advanced or not. as the lifeline of "large energy consumption", the data center power supply and distribution system bears the brunt like the heart and blood of the human body and attracts people's attention.

Due to the lack of understanding of the overall concept of data center construction, some enterprises only pay too much attention to the single index of the power supply and distribution system, but do not pay attention to the balance between the overall reliability and security indexes. this has led to a series of hidden dangers in data centers, such as energy waste, harmonic pollution and so on. Therefore, how to configure the data center power supply and distribution system in a safer, more applicable and greener way to make it as powerful as the heart, to deliver purer and continuous fresh blood to the data center, and to give full play to its maximum efficiency has become a problem that people have to consider in the new era.

"since the security and reliability of the power supply and distribution system in the data center are closely related to the selection of power supply, the layout of the power supply and distribution system, the structure and form of the power supply and distribution system, from the beginning of the design, it is necessary to put forward targeted power supply and distribution solutions on the premise of fully understanding the overall application and operation of the data center. Only in this way can we improve the efficiency of the data center. The goal of reducing power loss. Mr. Cheng Yingjun, Manager of data Center Solutions Department of Siemens IT Solutions and Services Group, said when talking about the construction plan of data center power supply and distribution system: "first of all, from the point of view of the choice of power supply, take UPS equipment as an example, over the years, the major brands of UPS have the functions of reliability, machine efficiency, control of one-button switch, remote alarm and online monitoring. Have been greatly improved, while the important indicators of output current harmonic distortion have reached less than 3%, it can be said that in the current technical level has reached the extreme, or even standardization. Therefore, in general, the standardization of power supply equipment leads to the layout of the power supply and distribution system and the architecture of the power supply and distribution system will play a vital role in the reliability and security of the data center power supply and distribution system solution. " But in recent years, a big problem is that most users think that high reliability can be obtained by purchasing good equipment, while ignoring the "barrel effect" of the reliability of the power supply and distribution system of the data center. As Mr. Wang Lijian, a member of the AC Stability Committee of the China Power Society and a senior engineer of the General Clearing Center, said: "some data centers use dual power supply in the design of the power supply system." On the other hand, the air conditioner has an one-way power supply. If the UPS is still powered on after the power outage, but the air conditioner stops working, then the normal operation of the entire data center will be able to maintain much less time. Many similar problems show that the power supply and distribution systems of some data centers lack the overall design concept at the beginning of construction, so there is a "short board" state in the process of practical application, that is to say, the reliability of air conditioning and refrigeration is not high, even if the UPS power supply system maintains high reliability, it will also reduce the overall efficiency of the data center.

Mr. Cheng Yingjun also has his own understanding and view on the "deficiency" of the power supply and distribution system in the data center. He said: "when foreign power is satisfied, the design of the data center should meet the actual needs of the data center within a predetermined life cycle, and can be changed at any time according to the needs of users. A set of sustainable development and good data center power supply and distribution system is an important condition to ensure the safe operation of all equipment in the data center. In order to ensure the smooth power supply of computing and storage equipment, it is necessary to have independent power distribution system, dual-source mutual investment system and UPS to form a unified power supply defense line. For large servers and other equipment that users need, it is also necessary to achieve reliable grounding in order to meet all standards. Through the reasonable configuration of the battery and power supply lines, the high stability, high reliability and high security of the data center power supply system can be improved.

Therefore, in order to design the power supply and distribution system of the data center according to the principles of safety, applicability and green, the first element is to consider the safety. Take Siemens Beijing data Center as an example. As the largest data center of Siemens in Asia, the first phase covers an area of more than 490sqm, has 100cabinets and 630servers, and can provide services to internal and external customers in China and the whole Asia. It is a new data center with converged data center, communication center and power supply center under one roof, and has become a Siemens regional strategic IT hub. Siemens data center cabinet power distribution mode adopts the form of bus to cabinet. Among them, the bus slot is a dense system, which is a typical sandwich structure internally, and it is a flexible and reliable power distribution system. the bus slot intensive system has the characteristics of stable and reliable, high power distribution efficiency, good heat dissipation, low voltage, resistance to mechanical shock and easy installation. This form of distribution mode not only greatly improves the flexibility and expansibility of cabinet power distribution. At the same time, it also greatly enhances the reliability and security of the whole system. At the same time, the distribution circuit breaker in Siemens Beijing data Center has the monitoring function, which can not only realize the centralized monitoring of the whole power system, but also facilitate the maintenance and management personnel to find problems accurately and quickly. Moreover, the PUE value (data center energy efficiency index), one of the core indicators of the data center, can be measured in real time in order to continuously optimize the configuration and maximize energy utilization. Therefore, the high energy efficiency (PUE=1.7) of Siemens Beijing data center and its own "best practices" provide the "best reference" for the majority of users.

While considering data center security, applicability and green energy saving are equally important, not that the higher the reliability, the higher the security. Similarly, take the power supply equipment UPS as an example, in the vast majority of cases, the output of two UPS is more reliable than its parallel single bus, but the opposite results will occur under specific circumstances, so it must be designed according to the actual power supply situation and specific business requirements of the data center, in line with the principles of applicability and availability. In fact, if we overconsider the reliability and safety and ignore the applicability, for example, 8 UPS make a very complex system to bring an electric equipment, first of all, this kind of system will reach a safety limit to a certain extent, and if we increase its complexity, it will only increase the probability and hidden danger of failure, but will not increase its reliability. Secondly, if the system goes beyond the scope of application, it will bring great economic waste. Therefore, when talking about the principles of the design of the power supply and distribution system of the data center, Cheng Yingjun also talked about "availability and following the principles of zoning and classification", that is, at the beginning of the design of the power supply and distribution system of the whole data center, fault tolerance, maintainability, capacity enhancement, fault prevention and manageability should be taken into account. "the layout of Siemens Beijing data center has adopted subdivision design. This design is similar to the concept of ship cabin subdivision technology, which improves the safety and reliability of the whole system. No matter any abnormal situation such as fire in any area, it will not affect other areas, so as to minimize the harm of local risk to the whole system. Secondly, according to the functions of different areas and the characteristics of equipment, regional temperature control can be carried out, and different temperature and humidity can be controlled according to the different requirements of power distribution room, battery room, assembly room, data tape backup room and IT main computer room, so as to achieve the best energy saving effect. "

In the end, the power supply and distribution system is an indispensable "heart and blood system" in the data center, and any minor failure will have a great impact on the operation of the whole data center. therefore, how to ensure its continuity, stability, balance and classification is one of the important starting points in the design of power supply and distribution system solutions in data centers, as Cheng Yingjun finally said. "the power supply and distribution system of the data center starts from the whole, and not a set of principles can be applied to all data centers. How to really achieve the policy of saving energy and reducing consumption depends on the actual application situation. We are on the basis of the continuous operation of the power supply and distribution system. Improve the availability of data center infrastructure through continuous improvement of data center equipment reliability, sound planning and good organizational management, make data centers greener, have a higher return on IT investment, provide more detailed services to more users, and reflect more IT value. "

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