基于改进自适应陷波滤波器的锁相方法

WU Xiaobo

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基于改进自适应陷波滤波器的锁相方法

更新时间：2025-08-13

- 基于改进自适应陷波滤波器的锁相方法
- Automation of Electric Power Systems Vol. 38, Issue 5, Pages: 103-108(2014)
- 作者机构：
  
  中国石油大学华东信息与控制工程学院,山东省,青岛市,266555
- 作者简介：
- 基金信息：
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- Published：2014
- 稿件说明：
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WU Xiaobo. [J]. Automation of electric power systems, 2014, 38(5): 103-108.
DOI：

WU Xiaobo. [J]. Automation of electric power systems, 2014, 38(5): 103-108. DOI：

摘要

风力发电等分布式发电系统并网时，需要实时检测电网电压的基波频率和瞬时相位，电网电压采样信号中含有的直流偏移不利于实现准确锁相。在理论分析直流偏移对自适应陷波滤波器影响的基础上，通过增加一个积分环节，使自适应陷波滤波器能够处理直流偏移。将改进后的自适应陷波滤波器应用到锁相中，在电网电压含有直流偏移以及谐波的情况下，实现了单相电压信号基波频率、幅值和相位的准确提取。实验结果验证了基于改进自适应陷波滤波器的锁相方法实现锁相的有效性。

Abstract

Fundamental frequency and instantaneous phase of grid voltage are critical information for grid-connected power generating systems.The DC-offset of grid voltage sampling signal is not propitious for accurate phase locking.By analyzing the impact of DC-offset on the adaptive notch filter（ANF），an integrator is added to the ANF to enable it to cope with the DC-offset.Fundamental frequency，amplitude and phase of the single-phase grid voltage signal containing the DC-offset and harmonics are accurately extracted by means of the enhanced ANF，based on which the validity of phase-locking is proved.

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