零序电压注入法控制三电平NPC中点电位平衡  

Zero sequence voltage injection to control neutral potential balance of three-level NPC

作　　者：黄海宏[1] 陈志强 王海欣[1] Huang Haihong;Chen Zhiqiang;Wang Haixin(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《电子测量与仪器学报》2020年第6期138-143,共6页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(51177037)资助项目。

摘　　要：学术界有两种解决中点电位波动问题的思路,基于空间矢量调制(SVPWM)控制的小矢量调节和基于载波调制(SPWM)控制的零序电压注入。采用的中点电位平衡控制方法是带校正控制的改进型的零序电压注入法,相较于传统的零序电压注入法,不仅兼顾了传统鞍形调制波的优势,还解决了此种调制波存在的过调制问题,并研究了实用的校验与修正零序电压计算方法,使得中点电位波动限制在5 V以内,网侧电流THD也相应的降低了1%。最后通过MATLAB/Simulink软件仿真和实验验证了所述控制方法的正确性和可行性。There are two ways to solve the problem of midpoint potential fluctuation in the academic world:One is small vector adjustment based on SVPWM control;the second is zero-sequence voltage injection based on SPWM control.The midpoint potential balance control method used in this paper was an improved zero-sequence voltage injection method with correction control.Compared with the traditional zero-sequence voltage injection method,it took into account the advantages of traditional saddle-shaped modulated waves,and improved the over-modulation problem,and studied the practical zero-sequence voltage calculation method,which finally effectively suppresses the fluctuation of the midpoint potential,and the practical calculation method of checking and correcting zero sequence voltage is studied,the fluctuation of medium voltage point is successfully limited to 5 V,and the THD of grid side current is correspondingly reduced by 1%.Finally,the correctness and feasibility of the control method are verified by MATLAB/Simulink software simulation and experiment.

关 键 词：二极管钳位 三电平变流器 中点电位平衡 零序电压注入 

分 类 号：TM461[电气工程—电器] TN35[电子电信—物理电子学]