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# 基于单周控制的新型有源电力 滤波器 - PowerPoint PPT Presentation

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### 基于单周控制的新型有源电力滤波器

2003.11

1.引言
• 电网谐波污染日益受到关注.有源滤波器(APF)与功率因素校正(PFC)已成为电力电子学研究热点之一.PFC需要对产生谐波的电力电子装置本身进行改造,调节其功率因数;APF可以直接与设备相连接,通过谐波抽取与注入来抑制谐波.经典的APF需要较复杂的控制,电路成本较高.

2.UCI-APF工作原理及直流分量问题
• 设有源滤波器开关频率为fs=1/T，全桥部分工作在两个状态：当0<t<DT时，M1、M4导通，当DT<t<T时，M2、M3导通。考虑到开关周期T远小于工频周期,一个开关周期内电感电流基本不变,根据电感伏秒平衡原理,可得到:

How to solve it

?

3.UCI-APF的直流分量抑制策略
• 针对上面所述的直流分量的产生机理，如果将电流直流分量负反馈，对开关占空比进行补偿，稳态情况下可以将直流分量调至零。负反馈可由电流积分得到。

4.实验结果及结论
• 根据上图原理得到实验结果。

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END
• 谢谢！