Authors: V.A. Shpenst, P. Grigorev

Title of the article: The study on interaction of PWM algorithms and the sine-wave filter in the three phase inverter of the mining truck

Year: 2021, Issue: 3, Pages: 60-70

Branch of knowledge: 09.05.03 Electrotechnical complexes and systems

Index UDK: 621.314.57

DOI: 10.26730/1816-4528-2021-3-60-70

Abstract: This paper deals with the issue of the interaction of pulse-width modulation algorithms with a sine-wave filter as a part of a traction electric drive of a mining truck. Using the automatic control theory methods, the sine filter parameters are calculated to suppress the higher harmonic components of the voltages of an autonomous inverter. To ensure the effective suppression of higher harmonics, the modulation frequency is determined. An imitation model of the inverter part of the AC traction electric drive of the 90-t BELAZ dump truck was created. The simulation was carried out in the Matlab / Simulink environment. As a result, the effective reduction of the higher voltage harmonics amplitudes is provided by the selection of the sine filter resonant frequency at 5 or more times lower than the modulation frequency of the inverter. The interaction of sinusoidal pulse-width modulation with a sine filter allows to reduce the distortion of the inverter output voltage down to 10%. The use of pre-modulation by the third harmonic of the pulse-width modulation carrier frequency in conjunction with a sine-wave filter ensures the distortion of the autonomous inverter voltage curve within 8%. The use of a sine-wave filter leads to a decrease in the voltage at the terminals of the drive motor stator windings, and therefore its overload capacity is reduced. With the aim of the voltage drop compensation across the sine-wave filter, the frequency converter DC-bus voltage must be increased. A sharp increase in the load current leads to a critical decrease in the voltage on the drive motor stator windings and can cause machine overturning in transient operating modes of the electric drive. Reduction of the drive motor currents in these modes can be provided by the electric drive control system. The results can be used to assess the quality of stand-alone inverters output voltages, as well as in studies of traction electric drives.

Key words: pulse-width modulation PWM sinusoidal PWM PWM with pre-modulation autonomous voltage inverter sine-wave filter higher harmonics traction electric drive mining truck

Receiving date: 11.05.2021

Publication date: 13.07.2021

CITE DOWNLOAD