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光伏发电中高压并网多电平逆变器的控制策略

, PP. 19-26

Keywords: 光伏发电,中高压并网,级联多电平逆变器,脉宽调制,功率平衡

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Abstract:

提出主从级联式多电平变换器应能兼顾系统对电压等级、功率转换效率、输出波形质量的高要求;特定谐波消除脉宽调制SHEPWM方法能够实现输出波形质量和功率转换效率的优化,便于实现功率平衡控制的控制方案.以十五电平逆变器为例,研究了主从级联式多电平逆变器的SHEPWM控制方法,提出了一种简单的功率平衡控制方法,以选取的典型点为例,研究了考虑功率平衡控制约束的SHEPWM非线性方程组的求解问题,对幅值调制比M=1的数值解进行了仿真和实验研究,结果证明所提控制方法是可行的.

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