Testing system for loads of frequency converters

Abstract

The invention provides a testing system for loads of frequency converters, which comprises a power supply transformer, at least one testing module and a controller. The power supply transformer outputs at least one power supply voltage, each testing module comprises at least one frequency converter to be measured and a load testing cabinet, each load testing cabinet is used as a variable load to adjust output of the corresponding frequency converter to be measured and outputs corresponding alternating-current voltage to an output end of the power supply transformer, the controller controls the magnitude of the load testing cabinet of each testing module when the load testing cabinet is used as the variable load, and accordingly the output of the frequency converters to be measured is adjusted by the aid of the load testing cabinets. A three-phase reactor is directly disposed at an output end of each frequency converter to be measured so as to realize filtering processing, and accordingly a running mode of each frequency converter with a motor load is simulated. In addition, the frequency converters with different voltage grades can be loaded and tested under the condition without the motors, residual electric energy is fed back to the output end of the power supply transformer to be recycled, and accordingly energy is saved.

Description

technical field [0001] The invention relates to the load testing technology of the frequency converter, in particular to the load testing system of the frequency converter without motor load. Background technique [0002] At present, with the rapid development of modern power electronics technology and computer control technology, a breakthrough technological revolution has also taken place in the field of electric transmission. For example, AC speed regulation replaces traditional DC speed regulation, especially frequency conversion speed regulation, which not only saves a lot of electric energy, but also improves the production process and operating environment, and improves product quality. Therefore, frequency conversion speed regulation is more and more concerned and favored by the industry for its high efficiency, high power factor and good speed regulation and braking performance. [0003] As we all know, the manufacturer of the frequency converter needs to test the ...

AI Technical Summary

Problems solved by technology

However, this test method converts electrical energy into mechanical energy, which consumes a lot of energy, and the noise of the motor is very high when it is working

Furthermore, the frequency converter usually has multiple voltage levels between 110V and 660V, so it is necessary to prepare multiple motors with different voltage levels for aging tests at the same time, which is not only costly, but also quite cumbersome to manage.

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