Variable-frequency speed regulator based on three-phase power supply

Abstract

The invention discloses a variable-frequency speed regulator based on a three-phase power supply. The variable-frequency speed regulator comprises a detection module, a control module, a human-machine interaction module, the three-phase power supply, a phase-shifting transformer, a five-level inverter. The three-phase power supply, the phase-shifting transformer, and the five-level inverter are connected successively. The output end of the three-phase power supply, the output end of the phase-shifting transformer, the output end of the five-level inverter are connected with the input ends of the detection module. The output end of the detection module is connected with the input end of the control module. The output end of the control module is connected with the input end of the human-machine interaction module and the input end of the five-level inverter. The variable-frequency speed regulator may monitor parameters, such as voltage, frequency, faults and the like, of a motor inside a frequency converter in real time, timely knows the operating state of the frequency converter, and may timely take corresponding measures according to a parameter change to guarantee the normal operation of the frequency converter.

Description

technical field [0001] The invention relates to a frequency conversion speed regulation system, in particular to a frequency conversion speed regulator based on a three-phase power supply, belonging to the field of frequency conversion speed regulation control. Background technique [0002] Since it was introduced into China in the 1980s, frequency converters, as important automation equipment in energy-saving applications and speed control, have been rapidly developed and widely used. In the practical application of the inverter, the frequency setting method of the inverter is mostly set by the panel or external terminals; At the same time, the location is scattered, the working environment is harsh, and the on-site panel adjustment is difficult to operate, and it is easy to cause problems such as misoperation; and when the analog quantity is adjusted through the external terminal, there are also problems such as low remote adjustment accuracy and inconvenient control; Fre...

AI Technical Summary

Problems solved by technology

In the practical application of the inverter, the frequency setting method of the inverter is mostly set by the panel or external terminals; At the same time, the location is scattered, the working environment is harsh, and the on-site panel adjustment is difficult to operate, and it is easy to cause problems such as misoperation; and when the analog quantity is adjusted through the external terminal, there are also problems such as low remote adjustment accuracy and inconvenient control; Frequency control is carried out by the switching value of the external control terminal of the inverter, which belongs to stepped speed regulation, which limits the scope of application

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