| 一种改进的基于DFT鉴相的单相锁相环方法 |
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| 引用本文： | 钟诚,严干贵,张泽军.一种改进的基于DFT鉴相的单相锁相环方法[J].电测与仪表,2016,53(5). |
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| 作者姓名： | 钟诚 严干贵 张泽军 |
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| 作者单位： | 1. 东北电力大学,吉林吉林,132012;2. 北京市供电检修公司,北京,100083 |
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| 基金项目： | 自然科学基金资助项目(51277024) |
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| 摘 要： | 为了改善基于DFT(Discrete Fourier Transform,DFT)鉴相单相锁相环方法的锁相速度和提高其在电网频率变化时的锁相精度,文章在常规基于DFT鉴相单相锁相环基础上进行了两点改进。一是减少锁相环中前向积分环节,PI调节器输出直接作为相位误差信号;二是增加电压频率跟踪环节,进而调节系统采样频率,实现同步采样。仿真和实验结果验证此改进方法的有效性。
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| 关 键 词： | 单相锁相环 离散傅里叶变换 动态特性 频率跟踪 同步采样 |
| 收稿时间： | 2014/10/12 0:00:00 |
| 修稿时间： | 2014/10/12 0:00:00 |
A new improved single-phase phase locked loop with Discrete Fourier Transform |
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| ZHONG Cheng,YAN Gan-gui and ZHANG Ze-jun.A new improved single-phase phase locked loop with Discrete Fourier Transform[J].Electrical Measurement & Instrumentation,2016,53(5). |
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| Authors: | ZHONG Cheng YAN Gan-gui and ZHANG Ze-jun |
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| Affiliation: | Northeast Dianli University,Northeast Dianli University,The power supply maintenance branch of Beijing |
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| Abstract: | In order to improve the dynamic characteristics of PLL based on DFT and enhance the phase precision when grid frequency changes, two improvements is presented in this paper. The first one is taking the post-PI regulation output as error signal of phase, call off the forward integrating element. The second one is the frequency estimation loop is adding, and adjust sample frequency to realize synchronous sampling. The results of simulation and experimentation show the superiority of this method. |
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| Keywords: | single phase locked loop DFT dynamic characteristics frequency tracking synchronous sampling |
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