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As one of the major pieces of equipment in fully mechanized coal mining, the drum shearer plays a critical role in improving the efficiency and energy utilization in the coal mining production process. In this paper, an energy consumption model of a shearer, derived from the analysis of the cutting and traction resistances on the shearer during different processes within a working cycle, is established. Based on the derived model, control and coordination strategies between the two speeds are proposed to minimize the shearer’s energy consumption in unidirectional mining. The case study of a real coal mine shows that the proposed models are valid, and the optimal control of shearer speeds can effectively reduce the energy consumption by 5.16% in a working cycle. To gain further insights into the impact of traction speed and drum rotational speed on the shearer’s energy consumption, several speed coordination cases are employed to further compare with the optimized one. Our study results show that the energy consumption of a shearer can be decreased with the increase of traction speed while decreasing drum rotational speed in coordination.
Zheng Zheng; Dilei Chen; Tao Huang; Guopeng Zhang. Coordinated Speed Control Strategy for Minimizing Energy Consumption of a Shearer in Fully Mechanized Mining. Energies 2021, 14, 1224 .
AMA StyleZheng Zheng, Dilei Chen, Tao Huang, Guopeng Zhang. Coordinated Speed Control Strategy for Minimizing Energy Consumption of a Shearer in Fully Mechanized Mining. Energies. 2021; 14 (5):1224.
Chicago/Turabian StyleZheng Zheng; Dilei Chen; Tao Huang; Guopeng Zhang. 2021. "Coordinated Speed Control Strategy for Minimizing Energy Consumption of a Shearer in Fully Mechanized Mining." Energies 14, no. 5: 1224.
Vehicle charging power supply is widely used because of its small size and portability. Aiming at the problems of slow dynamic response, subharmonic, oscillation and limited soft-switching range of phase-shifted full-bridge DC/DC converter, the paper proposed a modified PSFB converter by introducing clamp diodes at the primary side of the transformer to suppress voltage oscillation of the transformer’s secondary side. Also, digital peak current phase-shifting control and slope compensation are introduced to avoid subharmonic oscillation. Dynamic dead-time control technology introduced adjust the dead-time in different load ranges through the dead-time adjustment subroutine. Finally, an experimental platform of on-board charging phase-shifted full-bridge DC/DC converter is established. The experimental results show that the power supply eliminates subharmonic oscillation, achieves a wide range of soft-switching, improves the dynamic performance and antiinterference ability of the system, and optimizes the power efficiency.
Haijun Tao; Guopeng Zhang; Zheng Zheng; Changshun Du. Design of Digital Control System for DC/DC Converter of On-Board Charger. Journal of Advanced Transportation 2019, 2019, 1 -9.
AMA StyleHaijun Tao, Guopeng Zhang, Zheng Zheng, Changshun Du. Design of Digital Control System for DC/DC Converter of On-Board Charger. Journal of Advanced Transportation. 2019; 2019 ():1-9.
Chicago/Turabian StyleHaijun Tao; Guopeng Zhang; Zheng Zheng; Changshun Du. 2019. "Design of Digital Control System for DC/DC Converter of On-Board Charger." Journal of Advanced Transportation 2019, no. : 1-9.
Nowadays, marine electromagnetic method is a geophysical method which can effectively explore natural gas hydrate (NGH) resources. This method acquires seafloor structure and distribution laws of mineral resources by transmitting high-power electromagnetic waves to the seafloor, and its detection depth relies on the intensity of transmitted electromagnetic waves. At present, marine electromagnetic transmitter is not proper for transmission of high-power electromagnetic waves, and therefore, a novel controlled-source circuit of soft switching three-level marine electromagnetic transmitter is proposed in this paper, one step-down winding is added at the secondary side of high-frequency transformer in series connection with a linear inductor, asymmetric phase-shift PWM control is used, and soft switching of controlled-source circuit within the overall power range is realized. A detailed analysis of the operation process and circuit characteristics is given, and finally, a prototype is designed. Experimental results indicate that this circuit is of wide ZVS range and high efficiency, and it meets requirements for deep-sea detection of high-voltage power supply transmitter.
Haijun Tao; Guopeng Zhang; Zheng Zheng. Three-Level DC-DC Controlled-Source Circuit of Marine Electromagnetic Detection Transmitter. Journal of Electrical and Computer Engineering 2019, 2019, 1 -11.
AMA StyleHaijun Tao, Guopeng Zhang, Zheng Zheng. Three-Level DC-DC Controlled-Source Circuit of Marine Electromagnetic Detection Transmitter. Journal of Electrical and Computer Engineering. 2019; 2019 ():1-11.
Chicago/Turabian StyleHaijun Tao; Guopeng Zhang; Zheng Zheng. 2019. "Three-Level DC-DC Controlled-Source Circuit of Marine Electromagnetic Detection Transmitter." Journal of Electrical and Computer Engineering 2019, no. : 1-11.