High-voltage inverter market situation

The high voltage frequency converter is divided into high-low-high; low-high; high-high. High-low-high-voltage high-voltage inverters are used to step down high-voltage power transformers and use low-voltage inverters to control them. The voltage is then increased by the step-up transformer to the voltage used by us, and it is used for high-voltage motors. General high and low high-end methods are used in low-power high-voltage motors for frequency conversion and energy saving. The low-high mode high-voltage inverter is controlled by a low-voltage inverter and directly boosts the voltage to the motor using a step-up transformer. The low-high mode is also used in low-power high-voltage motors for frequency conversion and energy saving. The high-high-voltage high-voltage inverter directly uses a high-voltage power supply and directly outputs a high-voltage power supply for high-voltage motors. The high way is mainly used in high-power high-voltage motors for frequency conversion and energy saving.

AC frequency conversion speed control technology is a combination of strong and weak electricity, electromechanical integration technology, not only to deal with the conversion of large electrical energy (rectification, inverter), but also to deal with the collection, transformation and transmission of information, so it must be divided into power and control Two major parts. The former must solve the technical problems related to high voltage and high current, and the latter should solve the problems of hardware and software control. Therefore, the future high-voltage frequency control technology will also be developed in these two areas, its main performance is:

1 High-voltage inverters will develop in the direction of high power, miniaturization, and lightweight.

2 High-voltage frequency converters will develop toward direct device high voltage and multiple superposition (device series and unit series).

3 Higher voltage, higher current new power semiconductor devices will be used in high voltage drives.

4 At this stage, IGBT, IGCT and SGCT will still play a major role. SCR and GTO will exit the inverter market.

5 The application of speed sensorless vector control, flux control and direct torque control will mature.

6Completely realize digitization and automation: parameter self-setting technology; process self-optimization technology; fault self-diagnosis technology.

7 Application 32-bit MCU, DSP and ASIC and other devices to achieve high-precision, multi-function inverter.

8 The related supporting industries are moving toward specialization and large-scale development, and the social division of labor will become more apparent.