High-frequency UPS performance can not only completely replace the power frequency machine UPS, in short, but also has the advantages that the latter does not have. There is no doubt that at the time it was a cutting-edge technology, and the UPS technology of the transform-type power frequency machine was presented in the 1970s. For decades, it has also made an immortal contribution to the field of power electronics technology. Generally speaking, the advancement of any technology is relatively speaking, and any advanced product also has a certain period of application. With the emergence and development of IT technology, the UPS components of the power frequency machine reveal its shortcomings, such as large size, heavy weight, high power consumption and low input power factor, which greatly affect the reliability of the data center. Historical development always follows a law: whenever a technology hinders the development of productivity, there will be a new technology to replace it.
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Advantages of high-frequency UPS compared with power frequency UPS 1. High input power factor The input power factor does not exceed 0.8 harmonic current is 30%. If the generator is connected to the front, the power frequency machine UPS is generally 200kVA, and the following input circuits are all thyristor 6 pulse rectification. The capacity of the generator must be at least 3 times the UPS capacity; if it is a single-phase low-power UPS generator, the capacity must be at least 5 times the UPS capacity.
The harmonic current is less than 5%. The input power factor of any high-frequency UPS can be more than 0.99. The capacity of the front-mounted generator is theoretically the same as the UPS power, which greatly reduces the investment and floor space. In particular, the full use of utility power has good economic and social significance.
2, its own power consumption is small plus harmonic filter or 12-pulse rectification, if the input power factor of the power frequency machine is required to be 0.95 or more, as shown in Figure 1. When the efficiency of the power frequency machine UPS is 5% lower than that of the high frequency machine UPS, the power frequency machine UPS consumes 50,000 kWh more than the high frequency machine UPS every year!
3, small external disturbances Mechanical noise affects people's physical and mental health, electrical frequency machine UPS electrical noise and mechanical noise. Electrical noise affects machine stability and reduces work efficiency. The high-frequency machine UPS works above 20kHz, and the 20kHz human ear can't hear the frequency, which makes the working environment quiet. Moreover, since the input power factor of the high-frequency machine UPS is as high as 0.99 or more, the external interference is almost zero.
4, small size, light weight The same manufacturer's 250kVA high-frequency machine UPS weight only 830kg power frequency machine UPS due to the output transformer and adapt to low-frequency components such as 50Hz inductors and capacitors make the volume and weight are very large. For example, a brand 200kVA power frequency machine UPS weighs 1380kg.
5. All-digital technology Nowadays, it is generally developed as a combination of digital and analog technology. Analog technology is less reliable than digital technology. The high-frequency machine UPS technology is an all-digital technology, the analog technology originally used by the power frequency machine UPS. The reliability is very high.
6. Strong adaptability to the power grid This greatly extends the life of the battery. The power frequency machine UPS is very difficult to adapt to the input voltage ±15% change; and the high frequency machine UPS even adapts to the input voltage ±30% or more changes.
7. The parallel current can be attenuated to almost zero and the direct parallel connection of the transformer is most likely to generate circulation. The parallel connection of the power frequency machine UPS is the direct parallel connection of the transformer. Moreover, the path of the circulation is unblocked, as shown in Figure 2a. Since the UPS has no output transformer, its parallel connection is shown in Figure 2b. It can be seen that there is an obstacle everywhere in the circulation path. The voltage difference less than 2V is not formed into a loop, and the power frequency machine UPS will form a large circulation in this case. .
The future development of high frequency machines:
1. High power factor and low harmonic The currently widely used thyristor phase-controlled rectifier has a low power factor and a large harmonic wave on the side of the network. Increasing the grid-side power factor of solid-state welders is becoming increasingly important for both users and the grid. Therefore, it is very urgent to study the requirements of dynamic reactive/harmonic compensation devices and high-power high-power-factor rectifiers.
2. High-frequency current At present, the domestic solid-state welding machine has a working frequency of about 800 kHz. It cannot completely replace the tube equipment in the special welded pipes such as non-ferrous metal pipes. Therefore, improving the operating frequency of the solid-state welding machine, expanding the application field, and finally replacing the high-energy-consumption and low-efficiency electron tube welding machine is one of the development directions of the solid-state welding machine.
3. Supporting and intelligent control With the intelligent degree of welded pipe production line and the high reliability requirements of solid-state welding machine, it is necessary to strengthen the development of supporting facilities for solid-state welding machines, such as welding machine water cooling system, load matching and sensor production. , sealed chassis design, speed-power closed-loop control system. At the same time, the solid-state high-frequency welding machine is developing in the direction of intelligent control. The solid-state welding machine with computer intelligent interface, liquid crystal display man-machine interface, remote control, automatic fault diagnosis and other control performance is becoming the next generation development goal.
4. Supporting and intelligent control With the intelligent degree of welded pipe production line and the high reliability requirement of solid state welding machine, it is necessary to strengthen the development of supporting facilities of solid welding machine, such as welding machine water cooling system, load matching and sensor production. , sealed chassis design, speed-power closed-loop control system. At the same time, the solid-state high-frequency welding machine is developing in the direction of intelligent control. The solid-state welding machine with computer intelligent interface, liquid crystal display man-machine interface, remote control, automatic fault diagnosis and other control performance is becoming the next generation development goal.
5. Automatic load matching Automatic control of load is achieved by control technology to adapt to load changes and improve solid-state power utilization and welding efficiency.
