The mining method of anti-electromagnetic interference for electronic equipment in coal mine by considering network communication technology
Introduction
There is a large number of mobile or semi-mobile production equipment in the mine, such as electric locomotive, electric haulage shearer, belt conveyor, etc. Large electromechanical equipment has high power, relatively concentrated position and frequent start and stop, which will produce serious electromagnetic interference and adversely affect the work of automation equipment such as communication in coal mine [1]. With the rapid development of power electronic technology and the integration of power equipment, various new power electronic equipments have appeared in coal mines. With higher switching frequency and power, the control circuit becomes more and more complex. In the process of high-speed switching, the power switching devices in the main circuit of these power electronic equipment will produce high dv/dt and di/dt, which will produce serious conducted electromagnetic interference and sometimes strong electromagnetic radiation, which will cause interference to underground mining work and even bring potential safety hazards [2]. Electromagnetic interference there will have a serious impact on the surrounding electronic and electrical equipment, and may endanger the safety of mining personnel. In addition, most of these down hole electronic devices use PWM technology, and the power spectrum of output voltage and current is discrete, which will produce a large number of high-order harmonic components related to switching frequency, causing electromagnetic pollution to the power grid. At the same time, the measurement and control circuits of these power electronic devices are also subject to electromagnetic interference from their main circuits and mine environment. Therefore, studying the anti-electromagnetic interference performance of electronic equipment in coal mines can realize non-interference, high-efficiency and safe mining in coal mines.
However, the research on anti-electromagnetic interference mining of coal mine electronic equipment at home and abroad is still in the development stage. At present, research on anti-electromagnetic interference of coal mine electronic equipment mainly focuses on electromagnetic interference testing technology, electromagnetic interference mechanism research, electromagnetic interference modeling, electromagnetic interference suppression technology and other directions. Some scholars have put forward a mining method for anti-electromagnetic interference of coal mine electronic equipment based on electric field shielding technology, which mainly uses electric field shielding technology to suppress the influence of electrostatic field and constant magnetic field of coal mine electronic equipment, and eliminate the interference caused by distributed capacitive coupling among multiple circuits, so as to carry out the mining work smoothly [3]. Domestic research on anti-electromagnetic interference mining methods of underground electronic equipment is mainly about the propagation characteristics of electromagnetic waves, such as the influence of the shape and size of underground roadway on electromagnetic wave propagation, which mainly involves the influence of electromagnetic wave cut-off frequency in mine environment [4]. Some scholars put forward an anti-electromagnetic interference mining method for electronic equipment in coal mine based on single-point grounding technology, which mainly uses single-point grounding technology to connect all circuits and grounding wires of electronic equipment in coal mine to a common grounding point, and takes this point as the zero potential reference point of circuits and equipment, thus realizing anti-electromagnetic interference mining of electronic equipment in coal mine [5]. Due to the influence of electromagnetic sensitivity, it is impossible to analyze harmonic interference sources when using the above-mentioned mining method for anti-electromagnetic interference of underground electronic equipment. The transmission time of output pulse is in the range of 0.5 μs–1.1 μs, and the rate is low. Therefore, a mining method for anti-electromagnetic interference of electronic equipment in coal mine underground considering network communication technology is proposed, By analyzing the interference source of harmonic, calculating the total distortion rate of harmonic, simulating the voltage of motor terminal, analyzing the process of voltage reflection.
Section snippets
Design of the mining method of anti-electromagnetic interference for underground electronic equipment in coal mine considering network communication technology
There are many devices that generate and break high voltage and high current in coal mines, and their starting and working processes have strong interference on data transmission. Among the interference sources, harmonic interference, input impedance and output pulse voltage interference of frequency converter, distribution parameters of transmission lines, voltage reflection of motor terminals, etc.
Experimental design
In this paper, the mining method of anti-electromagnetic interference for underground electronic equipment in coal mine considering network communication technology is tested. Longgu Coal Mine is selected as the experimental coal mine. Longgu Coal Mine is located in the south central part of Juye Coal field. The 3# coal seam currently mined belongs to rich coal, with a coal seam dip angle of 3–13° (average 8.0°), the average thickness of coal seam of 8.5 m, mining height of 3.7 m, caving coal
Conclusions
With the rapid development of high-power power electronic technology and the wide application of frequency conversion equipment in the coal mine, the problems of harmonic and electromagnetic interference are paid more and more attention. It has important theoretical research significance and practical application value to study the mining method of anti-electromagnetic interference for underground electronic equipment in coal mine. In this paper, the interference source is analyzed and the
CRediT author statement
Yapeng Yan: Conceptualization, Writing- Original draft preparation, Methodology, Software. Wentao Cao: Data curation, Writing- Reviewing and Editing, Validation.
Declaration of competing interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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2022, Materials Chemistry and PhysicsCitation Excerpt :Electromagnetic interference can impair health of people who possess sensitive biomedical implants that use electricity (e.g., pacemakers, insulin pumps, hearing aids) [4–6]. Many devices that use electromagnetic drives produce electromagnetic waves that can affect other devices, such as sensors, telecommunication devices, and receiving and transmitting antennas [7–10]. Electromagnetic interference can directly impede the performance of modern military operations [11].