PETT高压级联整流器控制策略研究  

Research on control strategy of high-voltage cascade rectifier in PETT

作　　者：窦泽春 DOU Zechun(CRRC Zhuzhou Institute Co.,Ltd.,Zhuzhou,Hunan 412001,China)

机构地区：[1]中车株洲电力机车研究所有限公司,湖南株洲412001

出　　处：《机车电传动》2022年第4期37-44,共8页Electric Drive for Locomotives

基　　金：国家重点研发计划项目(2017YFB1200900)。

摘　　要：随着新型功率半导体器件的不断涌现和广泛应用,轨道交通用电力电子牵引变压器(Power Electronic Traction Transformer,PETT)逐渐成为业内的研究热点,高压级联整流器是PETT系统的核心部件。文章在同步旋转坐标系下,提出一种基于瞬时功率平衡的改进型单相四象限控制策略,实现了对高压级联整流器电流基波有功分量和无功分量的快速调节;通过对高压级联整流器各功率模块吸收功率的调节,实现各功率模块直流电压平衡控制;最后提出高压级联整流器特定次谐波抑制方法,将特定次谐波的调制波指令叠加在基波控制和电压平衡控制的调制波指令上,形成总的调制波指令,实现对PETT高压级联整流器的综合控制。试验表明,当牵引网电压骤降20%时,其扰动修复时间小于20 ms;在电网电压产生畸变时,可保证电网侧电流无3、5、7次低次谐波;同时当高压级联整流器的负载相差20%时,控制系统仍能维持直流电压平衡。With the emergence and application of new generation power semiconductor devices, power electronic traction transformer(PETT) for traction has gradually become a research hotspot in the industry, while the high-voltage cascaded rectifier is the core component of PETT. Based on the synchronous rotating coordinate system, an improved single-phase four-quadrant converter control strategy based on the theory of instantaneous power balance was proposed, which realized the rapid adjustment of the active and reactive parts of fundamental current;then through the absorbed power regulation of each cascaded power modules, the cascaded rectifier achieved voltage balance control;at last, a specific harmonic suppression method was proposed, the harmonic modulation wave command was superimposed on the fundamental wave and the modulation wave of the voltage balance control to formed a total voltage command to achieve combination control of the system. Experiments show that when the traction grid voltage drops by 20%, the response time is less than 20 ms;when the grid voltage is distorted, the grid side current is guaranteed to have no low-order harmonics such as 3,5, and 7;meanwhile, when the load diversity is 20%, the control system can still maintain the balance of DC voltages.

关 键 词：轨道交通用电力电子牵引变压器 高压级联整流器 同步旋转坐标系 瞬时功率平衡 特定次谐波抑制 

分 类 号：U264.3[机械工程—车辆工程]