VIENNA整流器中点电位振荡抑制与平衡控制研究  

Investigation of Neutral-Point Voltage Oscillation Suppression and Balancing Control in VIENNA Rectifiers

作　　者：丁文龙 刘家君 段彬[1] 张承慧[1] 

机构地区：[1]山东大学控制科学与工程学院,山东省济南市250061

出　　处：《中国电机工程学报》2017年第24期7284-7293,共10页Proceedings of the CSEE

基　　金：国家重大仪器研制项目(61527809;51377101;61703239;2016ZDJS03A02)~~

摘　　要：VIENNA整流器具有结构简单、单位功率因数运行、谐波小等优点,但中点电位不平衡及振荡问题不仅降低电容寿命和系统可靠性,而且会导致电能质量差,甚至造成系统崩溃。为此,提出一种新型中点电位振荡抑制与平衡控制的调制方法。首先根据空间矢量等效原理简化零序分量注入调制,分析开关状态对中点电位影响并计算中点电位补偿系数,动态补偿注入的零序分量,最终实现中点电位振荡快速抑制。该方法不仅能够实现中点电位振荡的抑制和平衡控制,而且三相输入电流含有较低谐波。仿真与实验均验证了所提算法的可行性与有效性。With its simple structure, the VIENNA rectifier realizes the operation of the unit power factor and low harmonic. However, its neutral-point voltage unbalance and oscillation not only reduce the capacitor life resulting in a poor operational reliability, but also could degrade the power quality so seriously that could lead to system crash. Consequently, a novel method to suppress the neutral-point（NP） voltage oscillation and control NP potential unbalance was proposed in this paper. First, carrier-based PWM（CB-PWM） for VIENNA rectifiers was simplified based on the equivalence of SVM. Secondly, the effect of voltage vectors on the NP voltage was analyzed. After calculating the compensation factor of NP voltages, the injection of zero-sequence component is modified to minimize the low-frequency NP Voltage oscillation. The method proposed in this paper can suppress the NP voltage oscillation and control NP voltage unbalance with low current harmonic distortion. The feasibility and effectiveness of NP voltage oscillation suppression considering NP voltage balance control were verified in simulations and experiments.

关 键 词：VIENNA整流器 零序分量注入 中点电位振荡抑制 中点电位平衡控制 

分 类 号：TM46[电气工程—电器]