EXPERIENCE IN DEVELOPING AN AUTOMATED ELECTRIC DRIVE FOR A RELOCATION COMPLEX OF OPEN-PIT EXCAVATORS

Abstract

The necessity of developing mobile relocation complexes for open-pit excavators is substantiated, which ensure their transportation between working areas without the need for temporary high-voltage power lines, is substantiated.The current state of technology in this field is analyzed. Existing relocation complexes based on DC generators or high-voltage transmission systems demonstrate poor technical and economic performance. It is shown that the application of low-voltage electric drives is a promising approach. Modern experimental solutions implemented in Ukrainian open-pit mines by domestic and international companies are reviewed, with their advantages and drawbacks analyzed. Particular attention is given to the relocation complex with a high-frequency converter developed by the “Dalgakiran” company. The operation of the automated electric drive, designed by “Pluton IC” LLC and based on a dual rectifier, is described for the relocation complex of “Yuromash” LLC with FI. A structure of an automated electric drive for the relocation complex based on a dual-set thyristor rectifier is proposed, which ensures efficient utilization of the synchronous generator power and increases operational reliability under mining conditions. To optimize the diesel generator set power for large excavators, the application of a relocation speed limit is proposed. It has been determined that variable input parameters hinder the calculation of this speed limit for defining the requirements of a universal relocation complex. To address this, a feedback-based regression model has been developed for setting the relocation speed and optimizing the generator power. The calculated regression coefficients for maximum conditions confirmed the possibility of reducing the diesel-generator unit power from 400 to 240 kW while maintaining the minimally acceptable travel speed. Future research will focus on the development of a universal relocation complex.