A control method of variable frequency power supply for motor test

A variable frequency power supply and motor testing technology, which is used in motor generator testing, electrical components, conversion of AC power input to AC power output, etc., can solve the problems of inability to achieve multi-voltage level rated capacity output and large output harmonic content, etc. Achieve good parallel current sharing effect, ensure rated output, and avoid the effect of circulating current.

Active Publication Date: 2016-03-09
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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  • Description
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AI Technical Summary

Problems solved by technology

However, the existing technologies 2 and 3 adopt the energy circulation scheme of the common DC bus, and the output harmonic content is large, and a special output filter device needs to be added, and the rated capacity output of multiple voltage levels cannot be realized.

Method used

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  • A control method of variable frequency power supply for motor test
  • A control method of variable frequency power supply for motor test
  • A control method of variable frequency power supply for motor test

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Embodiment approach

[0073] As a typical implementation of the present invention, when the contactor KM3 is disconnected and the two four-quadrant cascaded frequency converters 1 operate independently, the maximum capacity of 2500KVA is completed, and the motors 2 of different voltage levels include no-load characteristic test, overlapping frequency temperature Relevant tests including the rise test; when the contactor KM3 is disconnected and the two motors 2 are rigidly connected coaxially, carry out related tests including the temperature rise test and load characteristic test of the motor 2 with a maximum capacity of 2500kVA and different voltage levels ; When two four-quadrant cascaded inverters 1 are running in parallel, the contactor KM3 is closed, and the maximum capacity of 5000KVA is completed. The relevant tests of motors 2 of different voltage levels include no-load characteristic test and overlapping frequency temperature rise test.

[0074] The four-quadrant cascaded frequency converte...

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Abstract

The invention discloses a control method for a motor testing variable-frequency power supply. A motor testing variable-frequency power supply system comprises two four-quadrant cascade frequency converters, motors and a contactor, wherein the two four-quadrant cascade frequency converters are used for respectively dragging one motor to work or simultaneously dragging two motors which are connected rigidly and coaxially to perform dragging test. When the two four-quadrant cascade frequency converters run independently, the contactor is switched off to complete motor test of different voltage levels respectively. When the two four-quadrant cascade frequency converters run independently, the contactor is switched off; and when the two motors are connected rigidly and coaxially, motor dragging test of different voltage levels is completed. When the two four-quadrant cascade frequency converters run in parallel, the contactor is switched on to complete motor test of higher capacity levels. Due to the adoption of the control method, the driving capability of the power supply system can be increased greatly, dual motors can be driven in parallel or driven independently, relevant test requirements of motors of different voltage levels and different capacities can be met, and four-quadrant transmission can be realized.

Description

technical field [0001] The invention relates to a control method of a power supply system, in particular to a control method of a variable frequency power supply system applied to an energy feedback type motor test. Background technique [0002] Motors are widely used in power plants, oil fields, petrochemicals, mines, metallurgy, chemicals, building materials and other industries. In recent years, with the rapid development of my country's national economy, the market demand for motors has become increasingly strong, and the requirements for the quality of motors have also become higher and higher. The motor test is one of the important means to test the quality of the motor, and its accuracy and reliability are closely related to the quality of the motor test power supply. In the motor industry, in the past, generator sets were mainly used as motor test equipment for motor testing. This method is restricted by the capacity of the equipment, and cannot meet the requirement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/32H02M5/458H02M7/219H02M7/5387G01R31/34
Inventor 黄欢彭力罗仁俊范伟邓霆钟强欧海平王博陈志新梁金成王世平黄志国肖泉华雷立熊强
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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