地铁能量回馈并联变流器零序环流自抗扰控制  

Zero-sequence Circulating Current Active Disturbance Rejection Control for Metro Energy Feedback Parallel Converter

作　　者：黄科元[1] 王剑平 张铁军 钟树人 HUANG Ke-yuan;WANG Jian-ping;ZHANG Tie-jun;ZHONG Shu-ren(Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082 [2]株洲中车时代电气股份有限公司,湖南株洲412002

出　　处：《电力电子技术》2019年第7期47-51,共5页Power Electronics

摘　　要：地铁列车制动时产生的制动能量通过多模块并联变流器逆变回馈至电网,加以回收再利用,是未来城市轨道发展的研究重点方向之一。在地铁牵引网振荡下,直流侧的电压扰动会使回馈用多模块交错并联变流器环流问题加剧。这里在两个并联三相脉宽调制(PWM)变流器的数学模型基础上分析直流侧电压扰动对零序环流的影响机理,通过动态控制空间矢量PWM(SVPWM)中的变零矢量来抑制零序环流,并引入二阶观测器估计扰动量进行补偿。在此基础上,设计了零序环流自抗扰控制器(ADRC),增加零序环流抑制环,构建带有零序环流抑制的交错并联变流器控制策略。实验结果表明,在牵引网直流电压振荡时,该方法能够有效抑制交错并联变流器的零序环流,提高回馈用交错并联变流器的抗干扰能力。The braking energy generated during the braking of subway trains is fed back to the power grid through multi-module parallel converters,which is recycled and reused.It is one of the research priorities of future urban rail development.Under traction DC bus voltage oscillation,the voltage disturbance on the DC side will increase the problem of circulation in energy feedback interleaved parallel converter.The influence mechanism of DC side voltage disturbance on zero-sequence circulation is analyzed based on the mathematical model of two parallel three-phase pulse width modulation(PWM)converters.The zero-sequence circulation is suppressed by dynamically controlling the zerovector in space vector PWM(SVPWM).A second-order observer is introduced to estimate the disturbance amount and compensate.Based on the above foundation,the zero-sequence loop active disturbance rejection controller(ADRC)is designed,and the zero-sequence loop suppression loop is added to construct the interleaved parallel converter control strategy with zero-sequence loop suppression.The experimental results show that the method can effectively suppress the zero-sequence circulation of the interleaved parallel converter and improve the anti-interference ability of the energy feedback interleaved parallel converter under traction DC bus voltage oscillation.

关 键 词：交错并联变流器 零序电流环 自抗扰控制 

分 类 号：TM46[电气工程—电器]