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必赢亚州官网 登录-Innovative Technology of Kosta Three-phase High Power UPS

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Welcome~Shenzhen KSTAR power Polytron Technologies Inc
Language: 中文版 ∷  英文版

Industry new

Innovative Technology of Kosta Three-phase High Power UPS

Innovative Technology of Costa Three-phase High Power UPS Power Supply


In the past ten years, driven by the demand of large and super-large data centers, semiconductors and other industries, many new ideas and innovations have emerged in three-phase high-power UPS power supply. In this paper, five important new technologies are briefly introduced.



Three operating modes


I. Priority Operation Mode of Inverter (Double Conversion)


From the point of view of electrical conversion technology, the high frequency machine of power frequency machine adopts Dual-Transform on-line technology, that is, after two energy transformations of rectifier and inverter, the sinusoidal AC power supply with voltage accuracy of 1% and harmonic content of less than 5% is provided by the inverter to the load. This mode of operation can also be called: Inverter priority mode (dual conversion).


The advantage of the preferred mode of the inverter is that the precision of the output voltage is as high as 1%. The disadvantage is due to the two 100% conversion of energy. Under normal load of 15%-60%, the efficiency of UPS is only 88%-95%. At the same time, the current flows through the power devices of the rectifier inverters every second. The fatigue aging of the components is serious and the life of the components decreases, which leads to the decrease of the usability of UPS. Usability is the most important requirement for UPS.


Inverter priority mode (dual conversion) itself is a low availability mode of operation. This is a fact that has been painfully recognized for so many years. Are there any new ideas? Low-power backup UPS and online interactive UPS are normally bypass city power output power supply, not also protect IT load?


A careful study will reveal two points:


1. In fact, the requirement of AC for IT load is not high. The allowable voltage is -20%/+10%, the frequency is 40-70 Hz, and the interruption time is 10-20 Ms. The most proud 1% output accuracy of the inverter priority mode is meaningless.


2. Today, the availability of urban power grid has been greatly improved, and the availability of urban 10kV power grid has reached 99.94%. These two factors prompt us to realize that high-power UPS in three-phase can choose bypass priority operation mode just like low-power UPS. In fact, as early as 2010, each manufacturers three-phase UPS allowed users to choose the bypass priority mode, namely ECO mode (economic mode).


Second, bypass priority operation mode (ECO mode)


Under normal circumstances, UPS operates in the static bypass first, and is supplied directly by the municipal power to the load. When the bypass voltage exceeds the set window range, it will switch to the output mode of the inverter. The advantage of this model is that the efficiency is as high as 99%. The disadvantage is that the municipal direct power supply will produce bidirectional*, and the input power factor harmonic current index is poor. More importantly, when bypass failures require switching back to the inverter mode, the switching time of 4-20ms will occur, which will cause load interruption in some cases, greatly reducing the availability of UPS.


In this case, whether we can find a mode of operation, which not only has high availability, but also can improve the efficiency of operation. At the same time, the parameters of performance indicators can also meet the load requirements, has become an important goal of research and development of manufacturers.


3. Super bypass priority operation mode (E-transform mode)


Normally, the inverters work in parallel with the bypass municipal power supply, which is equivalent to the active filter. The inverters provide harmonic current and reactive power, and the bypass municipal power supply fundamental current and active power. The output voltage is determined by bypass. The advantages of this mode are that the current flowing through the power devices of rectifiers and inverters is small, the fatigue aging of components is slight, the service life is prolonged, and the usability of UPS is improved. Because the inverters are always running in parallel, when the bypass market power exceeds the window range, the system will switch back to the inverters at 0ms, and there is no problem of long switching failure time. The efficiency of this model is 98.8%, which is second only to ECO model. In addition, since the controllable bypass circuit only provides fundamental current and active power, the input power factor is 0.99 and the input harmonic current is less than 5%.


At present, the mainstream first-line brand manufacturers in the three-phase high-power UPS series are similar to the E-conversion technology in operation mode, for users to choose to use.


Multilevel Inverter Technology


Power frequency machine adopts transformer AC boost technology. The power frequency machine is usually equipped with 32 12V batteries. The DC bus voltage is 432V under floating charge, which is low. It can only invert 160V AC. It has to use boost power frequency transformer at the back end of the inverter to output 220/380V AC. The voltage of the power device of the inverter is 432V, which is low. The IGBT with 800V voltage withstand value can meet the requirement.


DC/DC DC DC boost technology is used in high frequency machine. In order to cancel the transformer and ensure that the inverter can directly invert 220V/380V AC, a DC/DC boost link of IGBT is added after the rectifier to make the DC bus voltage of the front end of the two-level inverters reach 800V, so that the voltage of the power components of the inverters is 800V, and 1500V IGBT is needed to meet the requirements.


By studying the failure rate curves of power devices such as field effect transistors and IGBT, it is found that the failure rate of power devices with 1500V voltage withstand value is several times higher than that of power devices with 800V voltage withstand value. In this way, researchers realize that reducing the voltage of power devices and selecting low voltage power devices can theoretically improve the availability of inverters. User experience practice also proves that the inverters of power frequency machines are more usable than those of two-level high frequency machines. In order to improve the availability of high frequency machine, three-level four-level inverters have been developed in the industry.


High Power Parallel Computer System with New Physical Architecture

Users of large and super-large data centers and semiconductor industries often build UPS systems with power of 1500kW or more, which requires the use of multiple UPS parallel system architecture. We all know that there are two kinds of parallel electrical structure, multiple UPS direct parallel, and public static bypass.

CONTACT US

Contact:Li Sheng Yuan

Phone:

Tel:400-080-0308

Email:

Add: The 4 layer of 1 science and technology two Road Software Park, high-tech zone, Shenzhen, Guangdong

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