Research On Energy Saving Strategy Of Multi-Motor-Driven Belt Conveyor Based On Power Balance

Nowadays, with the development of social economy, the production scale and efficiency of enterprises urgently need to be promoted, which accelerates the development of belt conveyor in the high-speed, long-distance, energy-saving, intelligent direction. In order to meet the miniaturization standards and cost control of equipment selection, more importantly, to reduce the tension of the belt, the use of multi-motor to drive a long-distance, high-speed belt conveyor is necessary. However, the quantity of driving motor increase will inevitably lead to the increase of degrees of control freedom in the system and energy consumption, the former will make a certain driving motor overload operation and even damage in serious condition, thus achieving the power balance between the driving motors in the belt conveyor system is very necessary. Due to in the actual driving device selection of the belt conveyor, experts generally consider a certain margin, which easily lead to system and equipments do not match, along with the traditional belt conveyor is limited by the control strategies and equipments, generally running at a constant speed, ignoring the actual situation that the conveying amount is changing throughout, which lead to serious energy consumption and low driving efficiency. Thus in the operational process of belt conveyor, the research of carrying on the energy saving and consumption reduction based on achieving the power balance between the driving motors is very meaningful.In this paper, the AC asynchronous motor is the research object in the control system, firstly, according to two different connections between the driving motors with rigid connection and flexible connection, the author ensures the control structures and strategies for the power balance between the driving motors based on asynchronous motor vector control model, the master-slave control structure is adopted for rigid connection, and the parallel control structure based on coupling compensation is adopted for flexible connection. Then the electrical energy saving methods and strategies based on the power balance between the driving motors are discussed, the belt conveyor resistance and energy consumption are analyzed in this paper. On this basis, energy-saving belt conveyor control algorithm based on variable frequency speed control is proposed. In order to improve the performance of the asynchronous motor vector control system, ANN intelligent control method and PID control strategy are combined in this paper for composite control to solve the control difficulties that the PID parameters can not be self-adjusting once selected, and the superiority of the compound controller is verified in the Simulink simulation platform.In the Matlab/Simulink, the modeling and simulation of dual-motor power balance control system based on the selected control structure and the single asynchronous motor vector control model improved by ANNPI compound controller are researched in this paper, the performance of the power balance strategy which can achieve proportional distribution of power between the motors is verified, and then the effectiveness of the energy-saving control algorithm based on variable frequency speed control by seeking the best belt speed is calculated, analysed and verified through the concrete examples.