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基于叠加原理的八开关三相逆变器全调制度范围内两种等效PWM算法

, PP. 96-108

Keywords: 故障重构拓扑,八开关三相逆变器,空间矢量脉宽调制,载波脉宽调制,过调制,叠加原理,调制函数

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Abstract:

对八开关三相逆变器(ESTPI)两种基于不同基本电压矢量的全调制度范围空间矢量脉宽调制(SVPWM)算法进行比较研究,在此基础上,为了提高ESTPI直流电压利用率,提出一种基于叠加原理的SVPWM过调制算法,进而得到ESTPI全调制度范围SVPWM算法,该算法根据调制度的大小,将整个ESTPI运行区域划分为线性调制区、过调制模式Ⅰ区和过调制模式Ⅱ区。从调制函数角度出发,基于PWM规则采样法,推导与SVPWM算法等效的载波脉宽调制(CBPWM)算法,并得到了随着调制度的变化,CBPWM算法调制函数的变化规律。仿真和实验结果表明,这两种算法作用下的输出线电压基波幅值与调制度呈线性关系,且最多能将其提高约10.2%。

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