铁路电力供电系统中的柔性直流输电控制技术

Flexible DC Transmission Control Technology in Railway Power Supply System

柔性直流输电控制器采用全控性电力电子器件,运用PWM脉宽调制技术进行整流逆变,可使电流、电压波动尽快恢复稳态,从而提高了铁路电力供电系统的稳定性,保证了供电质量。本文首先从调节控制器、定直流电压控制器、定交流电压控制器方面,概述了铁路电力供电系统中柔性直流输电控制器的设计要点,随后介绍了铁路电力供电系统中PID控制的基本原理和参数设置,在此基础上应用PACAD软件构建了仿真模型,对系统柔性直流输电方式进行仿真分析。结果表明,仿真开始时系统的交、直流电压和无功功率有小幅度波动,但是通过控制系统的调节在短时间内达到稳态值,保证了铁路电力供电系统的稳定运行。

The flexible DC transmission controller adopts fully controllable power electronic devices,and uses PWM pulse width modulation technology for rectification and inversion,which can restore the current and voltage fluctuations to a steady state as soon as possible,thereby improving the stability of the railway power supply system and ensuring the stability of the railway power supply system.Power quality.This paper firstly summarizes the design points of the flexible DC transmission controller in the railway power supply system from the aspects of the regulating controller,the constant DC voltage controller and the constant AC voltage controller,and then introduces the basic principles of PID control in the railway power supply system.On this basis,the PACAD software is used to build a simulation model,and the simulation analysis of the flexible DC transmission mode of the system is carried out.The results show that the AC and DC voltage and reactive power of the system fluctuate slightly at the beginning of the simulation,but the steady-state value is reached in a short time through the adjustment of the control system,which ensures the stable operation of the railway power supply system.