摘要
该文首先建立了基于开关函数的三相四线三电平中点箝位(NPC)电压型整流器的数学模型,分析了它的工作原理。并在Lyapunov稳定性理论的基础上,提出了一种新的三相四线三电平中点箝位PWM整流器非线性控制方法。该方法具有大范围渐进稳定,动态响应快的优点,并且通过设计新的三电平PWM调制方法,有效地解决了由现有三电平SPWM调制方法引入的直流母线中点电位存在三次波动的问题。系统仿真验证了该数学模型的正确性,以及基于Lyapunov直接法设计的非线性控制器的有效性。
In this paper, the mathematical model of three-phase four-wire three-level neutral-point-clamped （NPC） voltage source rectifier（VSR） using switching functions is founded firstly, and its operating principle is analyzed. Then a new nonlinear control law based on LYAPUNOV＇s stability theory for the PWM rectifier is presented. With this control law, the converter can be stabilized globally for handling large-signal disturbances, and exhibit good transient response. Also, by designing new three-level sinusoidal PWM method, this paper solves effectively the problem that the neutral point potential of DC-link have triple-harmonic fluctuation resulting from existing three-level SPWM method. Computer simulations of the system confirm the validity of the mathematical model and the effectiveness of the proposed control strategy.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第24期79-84,共6页
Proceedings of the CSEE
关键词
电力电子
三相四线三电平中点箝位整流器
数学模型
李亚普诺夫直接法
三电平脉宽调制
Power electroncis
Three-phase four-wire three-level NPC VSR
Mathematical model
Lyapunov＇s direct method
Three-level pulse width modulation（PWM）
