At present, the main problem that hinders the application of variable frequency speed control technology in high-voltage and high-power AC motor drive is that the power supply voltage of high-power motor is high (3~10kV), while the withstand voltage level of inverter components is lower (1kV), resulting in The problem of voltage matching. At present, the United States Robin Kang Company, AB Company, Germany Siemens, Russia Moscow Electric Power Research Institute, France CEGELEC Company, Japan Mitsubishi Corporation, Chengdu Oriental Kaiqi Electric Co., Ltd. and other large domestic and foreign companies have successfully solved the high pressure, The problem of large capacity has already produced high-voltage and high-power inverters. The technologies adopted by various companies are not the same, but there are two main types: one is the use of multiple technologies, that is, multiple low-voltage components are superimposed; the second is to continue Develop new high voltage resistant devices.
The main performance of its products is compared as follows:
(1) Siemens high-low-high (12-pulse) inverter harmonic voltage content greater than 10%, must use the filter circuit; AB high-high inverter harmonic voltage content is less than 5%, perfect harmonic-free inverter And Siemens high-high MT high-voltage inverters have a low harmonic content of only 1.2%, so the perfect harmonic-free inverter can protect online devices (such as computers, telephones, etc.) from harmonic interference, without considering Expensive harmonic filters and associated resonance problems.
(2) The perfect harmonic-free inverter has high efficiency. The perfect harmonic-free inverter, Siemens high-high MT high-voltage inverter and AB high-high inverter have their own efficiency between 95% and 97% in the whole speed regulation range. Siemens high-low-high inverters are relatively inefficient over the entire speed range, from 85% to 97%.
(3) The perfect harmonic-free inverter and the Siemens high-high MT high-voltage inverter have high power factor. In the normal shift range (60%~100% load), the power factor is basically unchanged, generally exceeding 0.95. Any power factor compensation capacitor; the controllable grid side rectifier of the Siemens high-low-high inverter makes a certain phase shift between the input current and the power supply voltage. This feature determines that the inverter must absorb reactive power. Power, power factor is lower at low loads, requiring a reactive compensator.
(4) The perfect harmonic-free high-high voltage inverter and the Siemens high-high MT high-voltage inverter can only operate in two quadrants. The high-low-high current inverter can operate in four quadrants.
The AB high voltage inverter can be operated in four quadrants. Siemens is committed to the application of IGBT technology. The SIMOVERT high-high MT high-voltage inverter is different from the Robincon IGBT inverter. Siemens uses high-voltage HV-IGBT components, with reduced power components and compact structure. The number of components required for the trigger circuit is much less than that of GTO or IG-BT. The trigger power is significantly lower than that of GTO or IGBT devices. This means that the MT high-voltage inverter is more reliable and has better performance. It is an ideal one. High-voltage inverter.
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