铁道科学与工程学报2025，Vol.22Issue(1)：344-356,13.DOI:10.19713/j.cnki.43-1423/u.T20240482
牵引变流器直流环节有源功率解耦控制策略研究
Decoupling control strategy of active power in DC link of traction converter
摘要
Abstract
In order to solve the large volume and excessive weight of the LC resonant circuit in the DC link of the high-speed train traction inverter,which leads to the loss of the overall power density,not conducive to lightweight.An active power decoupling circuit was introduced to replace the LC resonant circuit to suppress the secondary ripple of the bus voltage.To adapt to the application scenarios of high-power and low switching frequency rail transit,Buck active power decoupling topology was selected as an alternative solution to LC resonant circuit.By using the particle swarm optimization(PSO)algorithm to design parameters based on CR400AF high speed EMU,the decoupling capacitance value,decoupling inductance value.Fourth pulse amplitude were as close as possible to the group optimal value.Based on the case,a multi-objective optimization function was established to obtain the optimal parameters.And a power decoupling strategy based on repetitive control was proposed for the decoupling circuit,with decoupling capacitor voltage as the control objective,including four parts:second order generalized integrator secondary pulsation(SOGI)current extraction,DC component tracking,AC component tracking,and pulse width modulation(PWM).The research results show that the Buck chopper active power decoupling topology reduces the power consumption by 28.3%compared to the LC resonant circuit and 5%compared to increasing the support capacitance topology,which meets the lightweight goal of the DC link.In terms of DC voltage ripple,it increases by about 90 V compared to the LC resonant circuit and decreases by 35 V compared to increasing the support capacitance,which is about 3.47%,meeting the requirement of less than 5%.Meanwhile,compared to the response time of 50%load change,Buck chopper active power decoupling takes the least time,which is 34.8%less than LC resonant circuit,indicating an improvement in dynamic performance.Buck chopper active power decoupling can effectively filter out secondary pulsation,stabilize DC voltage output,make the grid side current waveform closer to a sine wave,and achieve high-precision command tracking under low bandwidth conditions,improving dynamic performance.The research results can provide reference for the decoupling topology selection and control strategy optimization of lightweight DC links.关键词
牵引变流器/轻量化/有源功率解耦/重复控制/Buck斩波拓扑Key words
traction converter/lightweight/active power decoupling/repetitive control/buck topology分类
交通工程引用本文复制引用
丁颢,曾一鸣,李卓鑫,向超群,成庶,范子寅..牵引变流器直流环节有源功率解耦控制策略研究[J].铁道科学与工程学报,2025,22(1):344-356,13.基金项目
中国国家铁路集团有限公司科技研究开发计划资助项目(P2023J004) （P2023J004）
