| The extensive application of More Electric Aircraft and all-electric aircraft require strictly onthe power quality, harmonic brings serious harm to the power system and the equipments of theaircraft, affects the output performance of the generator and reduces power factor of the system. It’sof great significance to study how to reduce the harmonic content of the airborne AC grid. Amongvarious measures to reduce harmonics, the multi-pulse rectifier has advantages of a simple structure aswell as high reliability, thus it is widely used in the fields of aerospace.Taking the DP-type18-pulse auto-transformer rectifier as an example, this paper analyzes thecircuit topology, then calculates the equivalent transformer capacity and the distortion rate of the inputcurrent. It uses Saber to simulate the circuits with fault states including asymmetric three-phase input,which makes up for the lack of simulation in the existing literature. Then, it calculates the parametersof the DP-type18-pulse ATRUs with different power levels. Finally, it designs s a software based onLabview for the calculation and the choice of parameters of DP-type18-pulse ATRUs on differentpower levels. Moreover, it develops a prototype with12.5KW power and takes experiments on itsdifferent conditions. The measured waveforms and the experimental data are analyzed, which showthat this kind of transformer rectifier can reduce input current harmonics and the output voltage rippleefficiently, that the efficiency of the prototype can reach98.1%and the total input current distortionless than7%. These results are in line with the requirements of national military standards and meanthat18-pulse ATRU can be well used in the airplane. |
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