CRH3型动车组辅助变流器半实物仿真系统

摘要

基于对CRH3型动车组辅助变流器电路结构、控制器K1及其接口的分析,采用的模拟方案有:使用电磁继电器模拟接触器的闭合和关断；使用常闭按钮开关模拟熔断器、主风扇M30和变压器超温保护的反馈触点；采用反相器将IGBT的控制信号取反,以模拟IGBT的反馈信号；设置2个可调电阻用以模拟功率模块进风口和出风口的PT100温度传感器,并通过调节电流实现对主风扇M30的控制.采用Matlab软件的Simulink工具箱建立辅助变流器半实物仿真系统主电路的仿真模型,在Matlab软件的实时开发环境(Real-Time Windows Target,RTW)模块中经过模型分析、代码转换、程序生成并运行联编文件等步骤,获取该模型的可执行文件.运行该可执行文件,通过选择外部模式、构造、连接目标机、运行等步骤,再打开控制器K1,实现半实物仿真系统和控制器的协同工作.使用Visual Basic软件开发该仿真模型的人机界面.实践证明,这一方式完全能满足设计需求,同时又具有较高的性价比.该辅助变流器半实物仿真系统已经成为辅助变流器国产化设计的重要工具.%Based on the analysis on the circuit structure of CRH3 EMU auxiliary converter, the controller Kl and its interface, the adopted simulation method is to analog the contactor on or off using the electromagnetic relay, analog the fuses, main fan M30 and the feedback contact of transformer over-temperature protection using the normally closed switch button. The inverter is adopted to negate IGBT control signal so as to simulate IGBT feedback signal. Two adjustable resistors are set to simulate PT100 temperature sensors at the air intake and outlet of the power module. The main fan M30 is control by regulating the current. Simulation model of the main circuit of the semi-physical simulation system for auxiliary converter is established by adopting the Simulink toolbox of Matlab software. Through the Real-time Windows Target (RTW) module of Matlab software, after model analysis, code conversion, program generation and running the binding files, the executable file of the model is obtained. The executable file is run by such procedures as selecting the external mode, incremental build, connecting the target machine and running, then the controller Kl is opened to make the semi-physical simulation system and controller work together. Visual Basic software is used to develop the man-machine interface of the simulation model. Practice has proved that this system not only can fully meet the design requirements, but also has a higher cost performance. The auxiliary converter semi-physical simulation system has become an important tool for the localization design of the auxiliary converter.