Nov 23, 2020
Future market analysis of high voltage inverter
The high-voltage inverter is divided into high-low-high; low-high; high-high. The high-low-high mode high-voltage inverter uses a transformer to step down the high-voltage power supply, then uses a low-voltage inverter to control it, and then uses a step-up transformer to increase the voltage to the voltage we use and supply it to the high-voltage motor. Generally, the high-low-high method is used for low-power high-voltage motors for variable frequency energy saving. The low-high mode high-voltage inverter is controlled by the low-voltage inverter, and the voltage is directly boosted to the motor voltage with a step-up transformer.
The low-high method is also used in low-power high-voltage motors for frequency conversion and energy saving. The high-high mode high-voltage inverter directly uses the high-voltage power supply after multiple modules of the inverter are connected in series, and directly outputs high-voltage for high-voltage motors. The high-high method is mainly used for high-power and high-voltage motors for frequency conversion and energy saving.
The AC variable frequency speed regulation technology is a combination of strong and weak electricity and a mechatronics integrated technology. It not only handles the conversion of huge electric energy (rectification, inverter), but also handles the collection, transformation and transmission of information, so it must be divided into power and control Two parts. The former must solve the technical problems related to high voltage and high current, and the latter must solve the software and hardware control problems. Therefore, the future high-voltage frequency conversion speed regulation technology will also be developed in these two aspects, and its main performance is:
① The high-voltage inverter will develop in the direction of high power, miniaturization and light weight.
② The high-voltage inverter will develop in the two directions of direct device high-voltage and multiple superposition (device series and unit series).
③ New power semiconductor devices with higher voltage and higher current will be used in high-voltage inverters.
④ At this stage, IGBT, IGCT, and SGCT will still play a major role, and SCR and GTO will exit the inverter market.
⑤ The application of speed sensorless vector control, magnetic flux control and direct torque control will become mature.
⑥ Fully realize digitalization and automation: parameter self-setting technology; process self-optimization technology; fault self-diagnosis technology.
⑦ Use 32-bit MCU, DSP and ASIC to realize the high precision and multi-function of the inverter.
⑧ Related supporting industries are moving towards specialization and large-scale development, and social division of labor will become more obvious.