一种铁路功率调节器的样机设计

摘要

分析了铁路功率调节器(Railway Static Power Conditioner,简称RPC)的基本结构和补偿原理,提出一种RPC的样机设计方法.控制系统采用基于TMS320F2812的数字控制器,集成了DSP,SRAM,EEPROM,A/D,PWM等模块,硬件部分设计采样电路和硬件死区延时模块.控制器软件分为主程序和中断程序,实时检测负载电流并计算得到负序与谐波补偿参考量,采用双闭环策略控制直流侧电压和逆变器输出电流,内环电流采用多模递推PID控制算法,实现有功功率转移以及谐波和无功补偿.实验结果表明,在所设计的硬件模块和软件系统下,RPC具有良好的负序和谐波补偿性能.%This paper analyzes the basic structure as well as compensation principles of railway static power conditioner,and proposes a model machine design method.The control system adopts digital controller based on TMS320F2812, which is integrated with DSP, SRAM, EEPROM, A/D, PWM modules and so on. In hardware section, it focuses on design of sampling circuit and dead-time delay module. Software of the controller is divided into two parts,the main program and interruption routines, which can detect load current in real-time and calculate negative sequence and harmonic compensation reference volume. DC-side voltage and output current of inverter is controlled with dual-loop strategy, and the inner current adopts multi-recursive mode PID control algorithm to achieve active power transfer and harmonic and reactive compensation. Experimental results show that RPC has a good negative sequence and harmonic compensation performance under the designed hardware modules and software systems.