Analyzing energy processes in power line of operating open-pit excavator

Key features of electric energy processes in mechatronic systems of electric excavators are discussed. Electrical power is supplied to excavator with 1st harmonic. In mechatronic system, electrical power is converted to mechanical work together with accumulation of kinetic and potential energies and with their mutual transformation inside movable elements of the machine, as well as with the dynamoelectric conversion of energy. During electric energy conversion, generation of higher harmonics takes place owing to the 1st harmonic energy. The load of the recuperated energy and higher harmonic generator is the power line, connected electrical equipment and the power source. When the power factor decreases, the loss of energy in the power line increases in proportion to the power factor square. From the analysis of energy processes and the accomplished experimental research, the key relationships are established between the consumed and recuperated energy during operation of open-pit excavator EKG-20 with ac-drive. Active energy recuperated by interconnected main drives of the excavator and united by the common dc link is partly taken by the main drives and partly goes, via the main transformer, to the power line. The auxiliary transformer connected to the power line takes some recuperated energy to power the ancillary electrics of the excavator. The beneficial use of the recuperated energy portion (more than 30%) by the ancillary electrics of excavators is experimentally proved. Higher efficiency of energy transmission from the source to a consumer is achieved owing to the use of compensating devices improving power factor and energy quality, due to reduction in input current of electric motors as well as thanks to the electric drive control algorithms ensuring electromagnetic compatibility of equipment.

Keywords: mechatronics, excavator, energy, electric drive, power factor, recuperation, efficiency, control system.
For citation:

Malafeev S. I., Malafeev S. S. Analyzing energy processes in power line of operating open-pit excavator. MIAB. Mining Inf. Anal. Bull. 2020;(3):126-137. [In Russ]. DOI: 10.25018/0236-1493-2020-3-0-126-137.

Acknowledgements:
Issue number: 3
Year: 2020
Page number: 126-137
ISBN: 0236-1493
UDK: 622.271.3
DOI: 10.25018/0236-1493-2020-3-0-126-137
Article receipt date: 09.01.2019
Date of review receipt: 27.05.2019
Date of the editorial board′s decision on the article′s publishing: 20.02.2020
About authors:

S.I. Malafeev, Dr. Sci. (Eng.), Professor, Chief Researcher, «Joint Power» Company Ltd, 111672, Moscow, Russia, Stoletovs Vladimir State University, 600000, Vladimir, Russia, e-mail: simalafeev@gmail.com, sim@jpc.ru,
S.S. Malafeev, Candidate of Technical Sciences, Lecturer, e-mail: Cepg87@gmail.com, Vladimir Polytechnic College, 600001, Vladimir, Russia.

For contacts:

S.I. Malafeev, simalafeev@gmail.com; sim@jpc.ru

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