基于DSP的地铁制动能量吸收装置设计

Design of metro braking energy absorption device based on DSP

设计了地铁制动能量吸收装置,装置控制系统采用双微机结构,上位机为管理机,下位机控制器采用DSP芯片TMS320LF2407,充分利用其强大的数据处理功能实现对装置的实时控制,上、下位机之间的通信采用RS-485总线实现。地铁系统的电压、电流等信号经模拟量检测电路送至DSP,由其内置A/D转换器进行模数转换,然后根据采集的信号对列车运行状况进行综合判断,满足吸收条件时装置快速投入工作,并经PID运算输出相应的PWM信号,放大后控制斩波器的通断,从而稳定网压。为提高系统稳定性,在IGBT驱动放大电路中采用带光电隔离的高压IGBT驱动芯片2SD315AI-33。实验结果表明该装置实时、可靠,实现了稳定网压的功能。

A metro braking energy absorption device is designed. Its control system adopts dual-processor architecture：upper management computer and lower controller. The powerful processing function of the lower controller,DSP TMS320LF2407,is fully used to carry out the real-time control of the device. The communication between two processors is implemented with RS-485 bus. The voltage and current signals of metro system are inputted from analogue detection circuit to DSP and converted by its built-in ADC ,based on which the running condition of train is evaluated. When the absorption condition is met,the device is put into operation,and after PID calculation,the corresponding PWM signals are outputted via amplifier to control the chopper for stabilizing the supply voltage. The driving chip 2SD315AI-33 with optoelectronic isolation is used for high-voltage IGBT to enhance the system stability. Experimental results show that the device is reliable and stabilizes the supply voltage in real time.