True Unit Power Factor Active Front End for High-Capacity Belt-Conveyor Systems

Abstract The paper presents results of analysis of a possible solution for enhancement of frequency converter (FC) AC supply power parameters. The method proposed is based on switched stabilisation of DC current of FC front-end rectifier unit. Such stabilisation allows obtaining rather good AC supply power parameters, i.e., its power factor and total harmonics distortion (THD) indicator for phase current. The paper also demonstrates a possible realisation scheme, a simplified mathematical description of processes in the scheme, as well as methods for consideration of its parameters, accounting the rated power of FC and the appointed level of the rectifier DC current continuity ratio. The results of computer simulation, to a great extent, testify a possible enhancement level.

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Application Research of a New Overrunning Clutch in Belt Conveyor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.479-481.890 ◽

2012 ◽

Vol 479-481 ◽

pp. 890-893 ◽

Cited By ~ 1

Author(s):

Tong Long Xue

Keyword(s):

Energy Consumption ◽

Power Factor ◽

Application Research ◽

Belt Conveyor ◽

Electric System ◽

Normal Operating ◽

Driven System ◽

Reduce Energy Consumption ◽

System Power ◽

Conveyor Roller

In mine high-power belt conveyor, the driven system commonly used multi-motor-driven program. After starting the conveyor, the lower power is needed in normal operating of the conveyor, this appears serious “big horse pulling small car” phenomenon. Therefore, using a new overrunning clutch, when normal operating of belt conveyor is ensured by some motors, you can cut off a group or two groups of gearbox and motor running. This will not only reduce the load of the belt conveyor roller, and reduce energy consumption of gearbox and motor, and also improve the electric system power factor. It means significant energy saving there.

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Artificial Neural Network for PWM Rectifier Direct Power Control and DC Voltage Control

Advances in System Dynamics and Control - Advances in Systems Analysis, Software Engineering, and High Performance Computing ◽

10.4018/978-1-5225-4077-9.ch010 ◽

2018 ◽

pp. 286-316 ◽

Cited By ~ 4

Author(s):

Arezki Fekik ◽

Hakim Denoun ◽

Ahmad Taher Azar ◽

Mustapha Zaouia ◽

Nabil Benyahia ◽

...

Keyword(s):

Neural Network ◽

Artificial Neural Network ◽

Power Control ◽

Power Factor ◽

Reactive Power ◽

Pwm Rectifier ◽

Direct Power ◽

Direct Power Control ◽

Dc Voltage ◽

Unit Power

In this chapter, a new technique has been proposed for reducing the harmonic content of a three-phase PWM rectifier connected to the networks with a unit power factor and also providing decoupled control of the active and reactive instantaneous power. This technique called direct power control (DPC) is based on artificial neural network (ANN) controller, without line voltage sensors. The control technique is based on well-known direct torque control (DTC) ideas for the induction motor, which is applied to eliminate the harmonic of the line current and compensate for the reactive power. The main idea of this control is based on active and reactive power control loops. The DC voltage capacitor is regulated by the ANN controller to keep it constant and also provides a stable active power exchange. The simulation results are very satisfactory in the terms of stability and total harmonic distortion (THD) of the line current and the unit power factor.

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