Dynamic voltage restorer application in the multi-motor electric drive system of a belt conveyor

Relevance of this research lies in addressing the issue of the voltage distortions’ negative impact on belt conveyor electric drive systems, caused by irregularities in the voltage waveform of power supply networks at coal mining facilities.

The purpose of this study is to create a mathematical and computer model that demonstrates the effectiveness of using a dynamic voltage restorer (DVR) in a belt conveyor multi-motor electrical drive system powered by an underground electrical network.

Methods. A multi-motor electromechanical system consisting of three BA280S4 low-voltage asynchronous motors with a total power of 330 kW making up the electric drive for the 2L100U-01 mining belt conveyor system is the object of this research. The study of the DVR operation in the electromechanical system under consideration was carried out by computer modeling using the MATLAB/Simulink® software.

Results. Simulation of system operation with the DVR and without it was performed for the following modes: studying the static stability of the system when the grid voltage reduces to 0.5 pu of its nominal value, studying the dynamic stability when the grid voltage fails for up to 8 seconds, the occurrence of non-sinusoidal and asymmetric voltage waveforms for 1-2 seconds. The simulation results confirm that, without the use of a DVR, the operation of the conveyor drive under voltage asymmetry conditions is characterized by multiple torque overloads, and in cases where voltage is reduced to 0.5 pu of the nominal value or is cut off for more than 8 seconds, there is a loss of speed stability. The use of the DVR ensures the restoration of the voltage waveform and the stability of the transient characteristics of drive speed and torque.

Conclusion. The conducted research illustrates that the DVR is an effective way to ensure stable and reliable operation of low-voltage multi-motor electric drives in high-performance coal mining belt conveyor facilities. The introduction of a DVR is reasonably recommended for coal mining enterprises.

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