单相级联H桥APF载波相移梯形波脉宽调制与电容电压平衡控制方法  

Carrier Phase-shifted Trapezoidal Wave PWM and Capacitor Voltage Balanced Control for Single-phase Cascaded H-bridge APF

作　　者：李红 周天奇 杨剑锋 LI Hong;ZHOU Tianqi;YANG Jianfeng(School of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学自动化与电气工程学院

出　　处：《电力系统及其自动化学报》2019年第11期10-15,共6页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(61863023);兰州交通大学优秀科研团队资助项目(201701)

摘　　要：针对电气化铁路谐波污染的电能质量问题,将载波相移梯形波脉宽调制CPS-TPWM(carrier phase-shifted trapezoidal wave pulse width modulation)策略引入到单相级联H桥多电平有源电力滤波器APF(active power fil?ter)中,同时在单相级联多电平有源电力滤波器直流侧电容电压控制上采用内外层控制策略,以提高直流侧电压的均衡性和稳定性。结合数学分析,搭建3个单元模块的单相级联H桥多电平APF主电路和控制系统进行仿真验证。结果表明:所提方法能够有效抑制电气化铁路中的谐波电流,并且能提高各单元模块直流侧电容电压的稳定性和均衡性。In light of the power quality problem of harmonic pollution with electrified railway,the carrier phase-shifted trapezoidal wave pulse width modulation(CPS-TPWM)strategy is introduced to a single-phase cascaded H-bridge multi-level active power filter(APF).Meanwhile,the inner-and outer-layer control strategy is adopted on the DC-side capacitor voltage control of the single-phase cascaded multi-level APF to improve the balance and stability of the DCside voltage.With the combination of mathematical analysis,the main circuit of the single-phase cascaded H-bridge multi-level APF consisting of three unit modules and the corresponding control system are built to conduct simulations and verifications.Results show that the proposed method can effectively suppress the harmonic current in electrified rail?way,and it can improve the stability and balance of DC-side capacitor voltage of each unit module.

关 键 词：载波相移技术 梯形波脉宽调制(CPS-TPWM) 级联H桥 直流侧电压 有源电力滤波器(APF) 电气化铁路 

分 类 号：TN713[电子电信—电路与系统]