Introduction to new technologies and development trends of high-power UPS power systems. High-power UPS power supply has penetrated into every important unit of life. It is currently mainly operated in two scenarios: data center and critical power supply. It is widely used in various industries such as IDC, finance, telecommunications, medical care, semiconductors, petroleum and petrochemicals, airports, rail transit, and electric power. widely used.

　　Five new technologies for high-power UPS power systems

　　1. Three operating modes of electrical conversion technology

　　Inverter priority

　　Bypass priority

　　super bypass priority

　　2.Multi-level inverter technology

　　It is necessary to find a reasonable balance between the withstand voltage value and the number of power devices. Schneider Electric's practice has proven that the availability of tens of thousands of four-level inverters operating worldwide is superior to traditional power frequency machines.

　　3. High-power parallel system with new physical architecture

　　Users in large and very large data centers and in the semiconductor industry often build UPS systems with a power of 1500KW and above, which requires a system architecture in which multiple high-power UPS power supplies are connected in parallel. The new parallel physical structure simplifies the entire UPS power system and reduces the number of external supporting power distribution cabinets, switches and cables. The on/off operation is simplified, and the copper bar connection makes the output impedance consistent. These features are conducive to improving the availability of high-power UPS systems.

　　4. Lithium batteries enter data centers

　　Ordinary lead-acid batteries are replaced approximately every 3-4 years. During the 10-12-year life cycle of a three-phase high-power UPS power supply system, users spend even more money on the battery system than the UPS host. Compared with lead-acid batteries, the advantages of lithium batteries in terms of electrical performance are: fast charging, fast discharging, and a cycle life of up to 6,000-10,000 times. The characteristics of fast discharge make lithium batteries particularly suitable for short-delay discharge scenarios of high-power UPS power systems.

　　5. Cloud services improve system availability

　　Cloud services have completely changed the after-sales maintenance model, reducing the number of failures, shortening maintenance time, and improving system availability. The user's UPS power supply or the entire system can be directly connected to the cloud monitoring platform, which can provide early warning of potential failure risks and handle them in advance. When a fault does occur, the fault can be discovered immediately and the fault location can be quickly and accurately determined.

　　Development trend of high power UPS power supply

　　Intelligent

　　Through the analysis and synthesis of various types of information, the intelligent system should not only realize the control function of the normal operation of the corresponding parts of the UPS power supply, but also realize real-time monitoring of the running UPS, analyze and process the important data information in the circuit, and draw conclusions from it. Functions such as whether each part of the circuit is working normally; when a UPS failure occurs, it can conduct timely analysis based on the test results, diagnose the fault location, and provide solutions; take necessary emergency maintenance and control actions in a timely manner according to on-site needs to prevent Expansion of the scope of failure; complete necessary self-maintenance, have the function of exchanging information, and can input information to the computer or obtain information from the networked machine at any time.

　　Digitizing

　　High-power UPS uses the latest digital signal controller (DSP) and digitized Hall sensor devices to complete 100% digital operation of the UPS power system. A multiple microprocessor redundant system is also used, using multiple microprocessors with independent power supplies to control the rectifier, inverter and internal static bypass, thus improving the digitalization level and reliability of the system.

　　High frequency

　　The power switch of the first generation UPS is a thyristor, the second generation is a high-power transistor or field effect transistor, and the third generation is an IGBT (insulated gate bipolar transistor). The switching speed of high-power transistors or field-effect transistors is an order of magnitude higher than that of thyristors, and the current capacity and speed of IGBT power devices are much larger and faster than that of high-power transistors or field-effect transistors, which reduces the operating frequency of the power conversion circuit. up to 50kHz. The advancement of conversion circuit frequency has greatly reduced the inductance, capacitance, noise, and volume used for filtering, and greatly improved UPS efficiency, dynamic response characteristics, and control accuracy.

　　Redundant parallel technology

　　Through the development of new application technology, multi-module redundant parallel operation in the UPS power supply can be realized without the need for additional central control components. The load is evenly distributed. When a problem occurs in a certain module, the load is automatically transferred, and hot plugging can be performed during maintenance. Unplug, greatly improving the power supply reliability of a single UPS. Coupled with the redundant operation of the system composed of multiple UPS, if a single UPS fails, it will be shut down immediately, and other UPS systems will automatically bear the entire load without any impact on the load.

　　Integrated

　　With the development of informatization, the application scope of power supply protection continues to expand and the requirements continue to increase. It is difficult for high-power UPS to meet these requirements alone. It must control the links involved in the entire power system. UPS starts from the initial equipment maintenance and system maintenance. Pure backup power supply technology for maintenance has been developed to today's integrated applications of information maintenance, intelligent management and overall computer room integration. Its connotation has expanded to power generation, power distribution, conversion, discontinuous power supply, computer room, power equipment, power cables, data wiring, In terms of environmental monitoring and system management, it is no longer UPS in the original sense. UPS power supply equipment is only the central component of the system.

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