Suppliers of frequency converter supporting equipment remind you that with the development of industrial automation, electrical automation has also been regarded as an important measurement indicator. The safe and stable operation of the power system is also an important part of the industrial automation process. Variable frequency speed regulation technology refers to adjusting the motor speed appropriately by changing the frequency of the working power supply based on the relationship between the motor speed and the input frequency of the working power supply.
At present, there have been many frequency conversion speed control methods, such as direct torque control, vector control, and so on. The development of digital control technology and the widespread application of semiconductor technology have led to the widespread use of vector control not only in the high-performance range, but also in the driving and specialized driving fields. Vector control has also been widely applied in household appliances such as variable frequency air conditioners and refrigerators in people's daily lives. In addition, AC drivers have also been 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 function of reactive power compensation principle: the purpose of installing reactive power compensation devices is to improve power supply efficiency and the power supply environment. It fully utilizes the principle of energy exchange between two types of loads to compensate for losses between power transformers and transmission lines. In the power supply system, reactive power compensation devices are an indispensable component; Only by selecting compensation devices reasonably and applying them to the power system can the power factor of the power grid be effectively improved, network losses be minimized to the maximum extent, and the quality of the power grid be effectively improved.
When selecting reactive power compensation devices, capacitors and reactors that are grouped and switched are usually applied. In some special cases, phase-shifting cameras and static reactive power compensation devices are also good choices; To meet the requirements of reactive power balance and promote the realization of voltage quality standards, it is necessary to apply voltage regulating devices. To apply the principles of hierarchical partitioning and on-site balancing to reactive power compensation in the power grid, it is also necessary to fully consider the reactive power regulation capability of substations, and vigorously promote voltage optimization and power factor. Advanced technologies such as power grid reactive power management system software should be actively applied to improve the quality of the power grid and ensure its safe and reliable operation.
The second is the load standard for frequency converters: compared to the heating time of transformers and motors, the heating time of semiconductor devices is often smaller, usually calculated in minutes. If there is an overload or overheating problem, it will cause significant problems. Therefore, it is necessary to strictly regulate the load conditions. It is necessary to classify the operating types of the inverter. The first level rated output is full current output, and overload situations will not occur; The second level can continuously output basic load current, and short-term overload operation can reach 50%; Overloading from level three to level six requires a longer time. At present, in the market, sales are generally only made to the second and first levels. In addition, it is necessary to combine the requirements of production machinery load performance and speed range to make a reasonable selection of frequency converters.