Abstract
Mining enterprises are energy intensive facilities. The capacity of single technological units can reach 5 MW. Variable-frequency drive systems are often used to set them in motion. The paper analyzes the features of choosing and using variable-frequency drives under diamond mining conditions. The study objective is to formulate and formalize the problems of introducing and operating variable-frequency drives at diamond-mining enterprises to further develop and implement guidelines for improving the performance of this drive type. To achieve this objective, the use of variable frequency drives in various process units of diamond mining should be studied and analyzed. The units are considered, for which in recent years, electric drive systems have been groundlessly (according to the authors) chosen by the engineering staff of enterprises. A technical and economic comparison of low-voltage frequency converters with the same power but different control modes is performed. The economic indicators of introducing high-voltage and low-voltage frequency converters into an existing electric drive system are calculated and represented as a comparative table. Conclusions are made on the need to proceed with the research and develop guidelines for implementing frequency converters at diamond-mining enterprises.
Highlights
The use of a variable-frequency drive (VFD) to improve the energy efficiency of industrial processes with the right approach to the implementation and further operation of an electric drive (ED) system may give a multiplicative economic effect [1-3]
2 Research objective and problems The research objective is to formulate the problems of operating a variable-frequency drive under the diamond mining conditions to further develop and implement guidelines for improving the efficiency of this drive type
The last example of implementing a high-voltage frequency converters (FCs) shows the feasibility of determining the electric drive power limit, at which low-voltage converters should be used [30]
Summary
The use of a variable-frequency drive (VFD) to improve the energy efficiency of industrial processes with the right approach to the implementation and further operation of an electric drive (ED) system may give a multiplicative economic effect [1-3]. The first one comprises units, in which the automatic speed control based on any process parameter (fluid pressure in the pipeline, fluid level in the sump, air depression in the ventilation duct, etc.) allows saving energy [12-15]; these include pumps and fans. The second group is the mechanisms, the speed of which should be controlled to ensure the required process unit operating modes [16, 17]. This group comprises, e.g., mine hoists and dredge trip spotting hoists
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