Power evaluation system of frequency converter in energy two-way transmission rectification mode and test method of power evaluation system

Abstract

The invention discloses a power evaluation system of a frequency converter in an energy two-way transmission rectification mode and a test method of the power evaluation system. The power evaluation system comprises a low-voltage high-current power evaluation system and a light-load joint debugging power evaluation system. The factory power elevation system of the frequency converter and the testmethod disclosed by the invention are suitable for factory routine test power evaluation of the frequency converter a rectifying module of which adopts an energy two-way transmission PWM (Pulse WidthModulation) rectification mode. The elevation system and the test method thereof disclosed by the invention have the advantages of simple design, low cost, high reliability, high actual application stability, strong generality and capability of saving electric energy.

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 bidirectional 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. [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 fields has become more and more popular; ...

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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