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电网技术  2014 

变采样周期锁相环的分析与设计

DOI: 10.13335/j.1000-3673.pst.2014.09.045, PP. 2605-2610

Keywords: 锁相环,变采样周期,三相不平衡,调节器设计

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Abstract:

现有文献对变采样周期锁相环(variablesamplingperiodPLL,VSP_PLL)的原理分析尚不深入,且未给出其调节器设计方法。通过与传统的基于同步旋转坐标系锁相环(synchronousreferenceframePLL,SRF_PLL)对比,明晰了VSP_PLL的控制机制,揭示了其内在联系。建立了VSP_PLL的离散域数学模型,分析了采用不同调节器的VSP_PLL环路特性,得出了调节器(包括其型式及参数)的优化设计方法。实验结果验证了所设计的VSP_PLL在电网电压出现谐波、不平衡、幅值及频率瞬变的情况下均可准确快速地锁相。

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