Variable frequency speed governor electric energy quality characteristic test cabinet, test system and test method thereof

Abstract

The invention provides a variable frequency speed governor electric energy quality characteristic test cabinet, a test system and a test method thereof. The system comprises an electric energy quality disturbance source which is connected to the input end of a tested Variable frequency speed governor, a drive motor which is connected to the output end of the tested variable frequency speed governor, a load motor whose input end is connected to a load motor variable frequency speed governor and whose output end is connected to the drive motor, and a digital collection device which is used for collecting and calculating the electric energy quality emission and tolerance characteristic indexes of the tested variable frequency speed governor. Compared with the prior art, the invention provides the frequency conversion speed governor electric energy quality characteristic test cabinet, the test system and the test method thereof, through controlling the electric energy quality disturbance source to output the test voltage comprising multiple types of electric energy quality disturbance, the electric energy quality tolerance of the tested variable frequency speed governor can be tested, the electric energy quality disturbance source is controlled to output standard voltage, and the various types of electric energy quality emission characteristics of the tested frequency conversion speed governor in various operation conditions can be tested.

Description

technical field [0001] The invention relates to the technical field of automated testing of electrical equipment, in particular to a frequency conversion speed regulator power quality characteristic testing cabinet, a testing system and a testing method thereof. Background technique [0002] The frequency conversion speed controller is a device that uses the on-off function of power electronic devices to convert the power frequency power supply into another frequency of electric energy to adjust the motor speed to achieve the effect of energy saving and consumption reduction. It mainly includes a control circuit, a rectifier circuit, and a DC intermediate circuit. and inverter circuits. The control circuit completes the control of the main circuit, the rectifier circuit converts the alternating current into direct current, the direct current intermediate circuit smoothes and filters the output of the rectifier circuit, and the inverter circuit reverses the direct current int...

AI Technical Summary

Problems solved by technology

[0004] 1. The frequency conversion speed controller mainly uses power electronic equipment, which will inject power quality disturbances such as harmonic currents into the grid during work, causing additional losses in various electrical equipment in the grid, thereby reducing the service life

[0005] 2. When the power supply on the input side of the frequency converter contains power quality disturbances, it may cause the frequency converter to run abnormally or even stop running, which will seriously affect the production safety and economy of power users

For example, when a short-term power interruption or voltage sag lasts less than 1 minute in the input side power supply, the variable frequency speed controller has limited energy storage capacity of its DC intermediate circuit, resulting in a reduction in the motor speed or even outage.

[0006] In summary, the power quality emission and tolerance characteristics of the frequency converter will have an important impact on the operation of the power grid and the power consumption of power users, but there is currently no technical means to effectively detect the power quality characteristics of the frequency converter, so as to reduce the Ensure the safety and economy of frequency converter operation

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