With the accelerated development of the degree of industrial automation and the process of urbanization, electrical automation is also used as an important measure. The safe and stable operation of the power system is also an important part of the industrial automation process. Today, the editor will introduce to you the development and application of frequency conversion speed regulation technology.
A brief description of frequency converter speed regulation technology:
Specifically, frequency conversion speed regulation technology refers to the proper adjustment of the motor speed by changing the frequency of the motor’s working power supply based on the relationship between the motor speed and the direct influence of the input frequency of the working power supply . With the development of science and technology, frequency conversion speed regulation technology has been widely used in our daily life and work. At present, there have been many frequency conversion speed control methods, such as direct torque control, vector control and so on. With the development of digital control technology and the widespread application of semiconductor technology, vector control has begun to be widely used not only in the high-performance range, but also in the drive field and special drive field, and it has also begun to be widely used in household appliances . Applications, such as inverter air conditioners, refrigerators, etc. In addition, AC drives have also begun to be applied in some other fields , such as industrial machines, electric vehicles, and so on.
Reasonable application of frequency converter speed regulation technology:
The first is the role of reactive power compensation principle: the purpose of installing reactive power compensation device is to improve the power supply efficiency and the power supply environment, and it will make full use of the principle of energy exchange between the two loads to power supply The loss between the transformer and the transmission line is compensated. In the power supply system, the reactive power compensation device is an integral part that cannot be obtained; only when the compensation device is reasonably selected and applied to the power system can the power factor of the grid be adjusted . Effectively improve, minimize the network loss, and promote the effective improvement of the quality of the power grid.
When selecting reactive power compensation devices, capacitors switched in groups are usually applied . In some special cases, condensers and static var compensation devices are also good choices; meeting the requirements of reactive power balance Requirements, in order to promote the realization of the requirements of the voltage quality standard, it is also necessary to apply the voltage regulating device. It is necessary to apply the principles of hierarchical division and local balance to the reactive power compensation of the power grid. At the same time, it is also necessary to fully take into account the reactive power adjustment capability of the substation, and to promote voltage optimization and power factor. The application of advanced technologies, such as power grid reactive power management system software , etc., can improve the quality of the power grid and make the power grid more secure and reliable.
The second is the load standard of the inverter .Compared with the heating time of transformers and motors, the heating time of semiconductor devices is often smaller, which is usually used in calculations It’s minutes, if there is an overload and overheating problem, it will cause a big problem.
Therefore, it is necessary to strictly specify the load conditions. It is necessary to divide the operation types of the converter. The first rated output is full current output, and the overload situation will not appear; the second level can continuously output the basic load current, and the short-term overload operation can reach 50%; Levels 3 through 6 take longer.
Currently in the market, generally only the second level and the first level are sold. In addition, it is necessary to combine the requirements of production mechanical load performance and speed regulation range to make a reasonable selection of the frequency converter.
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