低开关频率下三电平自然采样SVM算法的研究
单亮,汪海宁,孙琳琳
摘要(Abstract)：
为了降低大型光伏电站应用场合中的变换装置功耗,需降低器件开关频率,但低开关频率会引起输出电流低次谐波含量增大,影响输出电能质量。针对大型光伏电站中传统三电平逆变器空间矢量PWM(SVM)策略在低开关频率时低次谐波含量过高的问题,提出了将自然采样与SVM相结合的三电平自然采样SVM(NS-SVM)算法,并根据牛顿-拉夫逊迭代法简化了该算法,达到了快速在线数字实现。所提出的三电平NS-SVM算法相对于传统三电平SVM在低开关频率下具有更好的低次谐波性能,使得输出电流总谐波畸变率(THD)明显改善。最后通过Matlab/Simulink仿真验证了该调制策略的有效性。
关键词(KeyWords)： 大型光伏电站;低开关频率;三电平逆变器;低次谐波;自然采样SVM
基金项目(Foundation): 广东省引进创新科研团队计划资助(2011N015)
作者(Author): 单亮,汪海宁,孙琳琳
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