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基于特定谐波消除的并网锁相环技术

, PP. 34-40

Keywords: 锁相环,特定谐波消除,鉴相器,傅里叶分析,非理想电网环境

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Abstract:

锁相环(phase-lockedloop,PLL)技术的性能直接影响大规模并网系统的运行效果。为实现精确并网逆变控制,提出一种基于特定谐波消除(selectiveharmonicelimination,SHE)的锁相环技术。利用SHE能消除特定低次谐波的特性,将方波与SHE相结合,组成一种新颖的鉴相器;基于傅里叶分析,验证了该鉴相器的可行性。与常规PLL相比,该锁相技术大幅简化计算、便于数字化实现;且能保证在非理想电网环境下有效跟踪基波信号。Matlab仿真及DSP实验结果验证了该新颖锁相技术具有良好的动静态跟踪性能,且能同时适用于单相和三相并网系统。

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