摘要
基于冗余电压矢量的不同处理,提出一种三电平空间电压矢量调制模式这种调制模式较之常见的八段对称式SVPWM具有明显的谐波和控制优势。为解决三电平逆变器中点波动问题,基于这种调制方法提出了一种新的中点电压平衡控制方法,推导了分配因子计算公式,这种方法只需直流电容电压和负载三相电流的信息,通过调整小矢量对的时间分配因子实现对中点电流的精确控制。控制算法简便易行,有利于计算机数字化实现。所提出控制方法的有效性通过仿真和实验研究得到了证实。
This paper proposes a novel SVPWM strategy for the three-level neutral-point-clamped voltage source inverter, based on the particular disposition of all the redundant voltage vectors. The new modulation approach shows superior performance for the harmonic voltage and the control of neutral-point potential compared to the popular eight-stage centered SVPWM and realizes the balancing control of inverter neutral-point potential by modifying redundant small vectors pairs＇ distribution factor accurately, only requiting the information of dc-link capacitor voltages and three-phase load currents, which is convenient to apply and is compatible of digital computer realization. The feasibility of the proposed control approach has been verified via simulation and experiment results.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2006年第12期95-100,共6页
Proceedings of the CSEE
基金
上海市重点学科建设项目资助(T0103)
关键词
中点箝位式逆变器
空间矢量调制
中点电压平衡
分配因子
Neutral-point-clamped inverter
Neutral-point potential control
space vector pulse width modulation （SVPWM）
Distribution factor
