The frequency converter is a power control device that utilizes the on-off function of the power semiconductor device to convert the power frequency power source to another frequency. With the rapid development of modern power electronic technology and microelectronics technology, high-voltage and high-power frequency conversion speed-regulating devices continue to mature. The high-voltage problems that have been difficult to solve in the past have been solved in recent years by connecting devices in series or units in series.
High-voltage and high-power frequency converters are widely used in large-scale mineral water applications and production plants, petrochemicals, municipal water supply, metallurgical steel, electric energy and other industries, a variety of fans, pumps, compressors, rolling mills and so on.
Development status of domestic high-voltage inverters At present, there are not less than 200 manufacturers of low-voltage inverters in China, most of which are low voltage products of AC380V, and about 30 high-voltage high-power inverters. Since Robinson does not apply for patent protection in China, most manufacturers use the Robinson technology that is the unit tandem multiple structure.
With the further development of technology research, in theory and function, domestic high-voltage inverters can be compared with imported inverters. However, due to the limitation of process technology, the gap with imported products is still quite obvious. These conditions are mainly manifested in the following aspects:
1 The products of major overseas brands are stepping up to occupy the domestic market and speed up the pace of localization.
2 It has annual growth in R&D capacity and industrialization scale.
3 The power of domestic high-voltage inverters has also grown bigger and bigger. At present, the largest domestic application has achieved 20,000 KW.
4 The technical standards for domestic high-voltage inverters have yet to be standardized.
5 The industries supporting high-voltage inverters are underdeveloped.
6 General production process, can meet the technical requirements of the inverter product, the price is relatively low.
7 The key power semiconductors used in the drive are completely dependent on imports, and will depend on imports for quite a long time.
8 The technological gap with developed countries is narrowing, and products with independent intellectual property rights are being used in the national economy.
9 has been developed with instantaneous power failure and recovery, recovery and other functions of the inverter.
Some 10 manufacturers have already developed four-quadrant high-voltage inverters.
Vector controlled high voltage inverters are already in use.
Development status of foreign high-voltage frequency converters The inverter manufacturers of major foreign brands all form serialized products, and their control systems have also been fully digitalized. Almost all products have the vector control function, and the perfect technology level is also a major feature of foreign brands. At present, in developed countries, as long as there are motors, there will be inverters at the same time. The development of the current stage is mainly as follows:
1 Technology development started early and has a considerable industrialization scale.
2 The inverter that can provide extra power has now exceeded 10000KW.
3 frequency conversion speed regulation product technical standard is more complete.
4 The supporting industries and industries related to the inverter have begun to take shape.
5 can produce power devices in the inverter, such as IGBT, IGCT, SGCT and so on.
6 High-voltage frequency converters are widely used in various industries and have achieved remarkable economic benefits.
7 The product is internationalized and localization has increased.
8 New technologies and new technologies emerge in an endless stream, and they are used in a large number of products rapidly.
The future development trend of high-voltage inverters The AC variable-frequency speed control technology is an integrated technology for strong and weak electricity hybrids and electromechanics. It not only deals with the conversion (rectification, inversion) of huge electrical energy, but also deals with the collection, transformation, and transmission of information. It must be divided into two parts: power and control. 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.
High-voltage and high-power frequency converters are widely used in large-scale mineral water applications and production plants, petrochemicals, municipal water supply, metallurgical steel, electric energy and other industries, a variety of fans, pumps, compressors, rolling mills and so on.
Development status of domestic high-voltage inverters At present, there are not less than 200 manufacturers of low-voltage inverters in China, most of which are low voltage products of AC380V, and about 30 high-voltage high-power inverters. Since Robinson does not apply for patent protection in China, most manufacturers use the Robinson technology that is the unit tandem multiple structure.
With the further development of technology research, in theory and function, domestic high-voltage inverters can be compared with imported inverters. However, due to the limitation of process technology, the gap with imported products is still quite obvious. These conditions are mainly manifested in the following aspects:
1 The products of major overseas brands are stepping up to occupy the domestic market and speed up the pace of localization.
2 It has annual growth in R&D capacity and industrialization scale.
3 The power of domestic high-voltage inverters has also grown bigger and bigger. At present, the largest domestic application has achieved 20,000 KW.
4 The technical standards for domestic high-voltage inverters have yet to be standardized.
5 The industries supporting high-voltage inverters are underdeveloped.
6 General production process, can meet the technical requirements of the inverter product, the price is relatively low.
7 The key power semiconductors used in the drive are completely dependent on imports, and will depend on imports for quite a long time.
8 The technological gap with developed countries is narrowing, and products with independent intellectual property rights are being used in the national economy.
9 has been developed with instantaneous power failure and recovery, recovery and other functions of the inverter.
Some 10 manufacturers have already developed four-quadrant high-voltage inverters.
Vector controlled high voltage inverters are already in use.
Development status of foreign high-voltage frequency converters The inverter manufacturers of major foreign brands all form serialized products, and their control systems have also been fully digitalized. Almost all products have the vector control function, and the perfect technology level is also a major feature of foreign brands. At present, in developed countries, as long as there are motors, there will be inverters at the same time. The development of the current stage is mainly as follows:
1 Technology development started early and has a considerable industrialization scale.
2 The inverter that can provide extra power has now exceeded 10000KW.
3 frequency conversion speed regulation product technical standard is more complete.
4 The supporting industries and industries related to the inverter have begun to take shape.
5 can produce power devices in the inverter, such as IGBT, IGCT, SGCT and so on.
6 High-voltage frequency converters are widely used in various industries and have achieved remarkable economic benefits.
7 The product is internationalized and localization has increased.
8 New technologies and new technologies emerge in an endless stream, and they are used in a large number of products rapidly.
The future development trend of high-voltage inverters The AC variable-frequency speed control technology is an integrated technology for strong and weak electricity hybrids and electromechanics. It not only deals with the conversion (rectification, inversion) of huge electrical energy, but also deals with the collection, transformation, and transmission of information. It must be divided into two parts: power and control. 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.
Tisineo (Hi-Tech) Technology Co. Ltd , http://www.tisineosafe.com