Research On Driving Control System Of Mine Super Capacitor Electric Locomotive

At present,most battery electric vehicles used in coal mines use lead-acid batteries as energy storage devices and DC motors or three-phase asynchronous motors as drive control systems.This type of electric vehicle has a small number of battery charge and discharge cycles,long charging time,and maintenance.High cost,short battery life and large starting energy consumption of the motor.However,supercapacitors can reduce charging time and increase the density of discharge power;while permanent magnet synchronous motors can improve starting torque and performance of electric locomotives at low speeds,and reduce energy loss during starting.Therefore,this paper proposes to replace lead-acid batteries as energy storage devices with supercapacitors,replace DC motors(or asynchronous motors)with permanent magnet synchronous motors,and construct a new type of electric vehicle drive control system.This paper mainly studies the energy-saving conversion bi-directional DC/DC converter buck-boost control,and the three-phase inverter-driven permanent magnet synchronous motor start-up speed control.First,the energy storage device of the newly constructed mining electric locomotive super capacitor bank was analyzed and designed,and the voltage level of the super capacitor bank and the number of series and parallel connections of the single super capacitor were determined.An improved bidirectional parallel was selected through analysis and comparison.Interleaved DC/DC converters are used to implement DC-side buck-boost and energy feedback charging.A voltage/current dual closed-loop PI control strategy is proposed for the DC/DC converter to achieve a high step-up ratio,high-efficiency energy conversion,and reduction.Output current ripple and output DC voltage stabilization.Secondly,the motor drive control system of mining electric locomotive is studied.The motor drive system is mainly composed of three-phase inverter and permanent magnet synchronous motor.Based on the working characteristics of the mining electric locomotive and the technical requirements for starting and speed regulation,it is analyzed that the vector control strategy is adopted for the permanent magnet synchronous motor,and the maximum torque-current ratio control is determined at starting and low speed,and the optimal stator current is established.The system simulation model of operation control.The simulation results show the correctness of the vector control strategy.The hardware design of the driving control system of mining electric locomotive is carried out.The main circuit of the driving system includes two parts:bidirectional DC/DC converter and inverter.The main circuit,auxiliary power,drive isolation,voltage/current detection,position/speed are designed.Detection,etc.,and gave a detailed introduction of the two parts of the hardware circuit design,introduced the software design ideas of the drive system and some software flowcharts.Finally,MATLAB/Simulink software was used to simulate the proposed driving control system for mining electric locomotives.The test platform was built,and super capacitors,bidirectional DC/DC converters,three-phase inverters,and permanent magnet synchronous motors were built.The overall performance test of the composed drive control system has verified that the locomotive drive control system has greatly improved the starting and speed regulation performance of the locomotive,ensuring the safe and efficient operation of the mining locomotive.Figure[51]table[5]reference[81]...