Rated-capacity test device for active front-end voltage type AC-DC-AC frequency converter

Abstract

The present invention relates to a rated-capacity test device for an active front-end voltage type AC-DC-AC frequency converter. The test device is mainly and technically characterized by comprising a frequency converter, a transformer device and a power grid, wherein an active front-end rectifier AFER and an inverter INV of the frequency converter are cut into the power grid through the transformer device; and by adjusting related settings of AFER and INV, the power and the output power factor of the frequency converter can be adjusted flexibly, so that reversible operation tests for the rated capacity with different power factors can be carried out and the rated capacity of the whole frequency converter and the temperature rise of power devices can be tested. The test device is designed reasonably; and by adjusting the output settings of the active front-end rectifier and the inverter as well as the output power and the power factor of the frequency converter, reversible operation tests for the rated capacity with different power factors are carried out, so that the rated capacity of the whole frequency converter and the temperature rise of power devices can be accurately tested.

Description

technical field [0001] The invention belongs to the field of frequency converters, in particular to a rated capacity test device of an active front-end voltage AC-DC-AC frequency converter. Background technique [0002] Frequency conversion speed regulation technology has become an important means to save energy and reduce consumption, improve process flow, improve product quality and environment, and promote technological progress in the industrial field. With the development of new high-power power electronic devices, various high-power frequency converters have been Widely used in large industrial production equipment. At present, high-performance and high-power inverters adopt active front-end AC-DC-AC topology as the mainstream structure. [0003] Rated capacity test is one of the most important test contents of inverters. For small and medium power inverters, there are two traditional methods for rated capacity testing: one is that the output of the tested inverter ha...

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Problems solved by technology

The advantage of this test method is that reversible tests can be carried out, steady-state and dynamic performance tests can be carried out, and the power loss in the test process is small; the disadvantages are that the unit equipment and accompanying test converter system are complicated, the equipment investment is large, and the laboratory occupies an area Large, difficult to maintain mechanical equipment, not suitable for rated capacity test of high-power or ultra-high-power VFD

[0005] For high-power or ultra-high-power inverters, due to the limitations of test equipment capacity (such as inverter-motor unit), site, power supply capacity, etc., it is difficult to conduct a stable rated capacity test. Rated temperature rise and loss tests and tests are usually only It can be carried out according to the unit, and then the overall rated capacity of the inverter can be estimated, or the actual test can be carried out at the operating site of the inverter, but it is generally difficult to have a continuous and stable rated operating condition in the field test

Most of the reported test devices are for power devices or power units, and there are few test methods for the rated capacity of high-power inverters

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