АНАЛІЗ ВПЛИВУ ВИЩИХ ГАРМОНІК ПРИ ЖИВЛЕННІ АСИНХРОННОГО ДВИГУНА ВІД АВТОНОМНОГО ІНВЕРТОРА НАПРУГИ У SIMUL

Abstract

Autonomous voltage inverters(AVI) of three-level and two-level topologies power supplying an induction motor are considered in this article. The influence of the carrier frequency and the structure of the AVI on the shape of the current sine wave is analyzed. A comparison of the values of the coefficient of nonlinear distortions under the same conditions is made. The results are obtained using FFT Analysis in Simulink. The parameters of the induction motor have been calculated, the transient torque, velocity, and current transients of the motor stator and rotor have been obtained and compared. During operation, the engine, besides useful work, releases heat. This effect accompanies it throughout its operation, but overheating shortens the overall life of the machine. The presence of harmonics in the applied voltage can lead to excessive heating. Therefore, the purpose of this article was to compare the topologies of autonomous voltage inverters and to evaluate the effect on electrical and electromechanical motor performance in transients. Three-level AVI diagram of operation is considered. Technique from the aricle by Moshchinsky et al. was used to obtain unknown engine parameters based on passport data. The transients in the asynchronous motor make it clear that the autonomous inverters of both topologies at the tested frequencies make Simulink motor model to speed up to a nominal speed with about equal efficiency, which does not eliminate the fact that the shape of the currents and the electromagnetic torque is significantly distorted. The state of the machine and the losses in the transitional as well as the steady modes require further, more detailed study in the context of other articles.