Rated capacity test method of active front end voltage-type alternating current-direct current-alternating current frequency converter

Abstract

The invention relates to a rated capacity test method of an active front end voltage-type alternating current-direct current-alternating current frequency converter. The method is technically featured by comprising the steps as follows: (1) accessing an active front-end rectifier AFER and an inverter INV of the frequency converter to a power grid to form a closed-loop testing circuit through a transformer unit, respectively; (2) building a test control system in an independent vector control manner of active power and reactive power; and (3) flexibly adjusting the magnitudes of the power and an output power factor of the frequency converter by adjusting related settings of the AFER and the IVN, carrying out reversible operation tests of rated capacity under different power factors, and testing rated capacity of the complete set of frequency converter and temperature rise of a power apparatus. The method, disclosed by the invention, has rational design. The reversible operation tests of the rated capacity are carried out under different power factors by adjusting output settings of the active front-end rectifier and the inverter as well as the output power magnitude and the power factor of the frequency converter, and the rated capacity of the complete set of frequency converter and the temperature rise of the power apparatus are accurately tested.

Description

technical field [0001] The invention belongs to the field of frequency converters, in particular to a rated capacity test method 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...

AI Technical Summary

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 methods 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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