Power checking system for frequency converter adopting one-way energy transmitting and rectifying mode and testing method thereof

Abstract

The invention discloses a power checking system for a frequency converter adopting a one-way energy transmitting and rectifying mode and a testing method thereof. The system comprises an alternating-current power supply, a voltage regulator, transformers, a low-voltage high-current power supply output wiring cabinet and an alternating-current power supply output wiring cabinet, wherein the alternating-current power supply and the voltage regulator are separated into two paths after being connected in series; one path is connected with the input end of a rectifying system of a tested frequency converter through a first transformer and the low-voltage high-current power supply output wiring cabinet; the output end of the rectifying system is connected with a current divider; the other path is connected with the input end of the tested frequency converter through a second transformer and the alternating-current power supply output wiring cabinet; the tested frequency converter consists of a rectifying system and an inverting system; and the output end of the tested frequency converter is optionally connected with an inductance load or a resistance-inductance load through a change-over switch. In the invention, the voltage, current and frequency characteristics of the induction load as well as the voltage, current and the frequency characteristics of a resistance-inductance combined load are fully utilized; the power checking system has the advantages of simple design, low cost, high reliability, high practical application stability, high generality; and simultaneously, power is saved.

Description

technical field [0001] The invention relates to a frequency converter, in particular to a power assessment system and a test method for a frequency converter using energy unidirectional transmission and rectification. Background technique [0002] The frequency converter is a power control device that uses the on-off function of power semiconductor devices to transform the power frequency power supply into another frequency power supply. It is a device that converts power frequency power (50Hz or 60Hz) into AC power of various frequencies to realize the variable speed operation control of the motor. The output of the rectifier circuit is smoothed and filtered, and the inverter circuit inverts the direct current into alternating current with adjustable frequency and voltage. [0003] With the rapid development of my country's converter technology, the application of inverters in high-voltage power transmission, industrial variable transmission, electric traction and other fi...

AI Technical Summary

Problems solved by technology

Investigating the root cause, a large part of the reason is due to the high power consumption of the inverter factory current power assessment test (some are even as large as the rated power of the inverter), if a resistive load is used as a high-power assessment load (some even full power assessment), the waste of heat and electric energy can be imagined; if the back-to-back motor is used to drag the feedback load assessment system, the construction cost is also quite expensive

[0004] The main problems of the current general back-to-back motor load factory power assessment system and method are: the test system is expensive to build, the repair and maintenance are complicated, high cost and poor versatility

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