| 引用本文: | 吴梓亮,李银红,李明,李婧靓.一种基于修正相角差的傅氏测频算法[J].电力系统保护与控制,2015,43(13):111-117.[点击复制] |
| WU Ziliang,LI Yinhong,LI Ming,LI Jingjing.Fourier frequency measurement algorithm based on modified phasor angle difference[J].Power System Protection and Control,2015,43(13):111-117[点击复制] |
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| 摘要: |
| 基于相角差的传统傅氏测频算法所采用的相角差无法正确反映真实相角差，导致计算结果存在原理误差。提出了一种基于修正相角差的傅氏测频算法。利用相角差作为中间量，通过修正因子对相角差进行修正，消除传统傅氏算法的原理误差。算法保留了傅氏算法不敏感于噪声和谐波的良好特性。同时，采用基于二次插值技术的采样序列迭代修正方法，克服传统测频算法速度与精度无法兼得的矛盾。仿真结果表明相比于传统傅氏算法，在相同的硬件环境下，该算法的运算速度及测量精度均有提高。 |
| 关键词: 电力系统 频率测量 傅氏算法 相角差 修正因子 二次插值 采样序列迭代修正 |
| DOI：10.7667/j.issn.1674-3415.2015.13.017 |
| 投稿时间：2014-09-29修订日期：2015-01-26 |
| 基金项目:2012年南方电网公司科技项目(CSGTRC-K12008) |
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| Fourier frequency measurement algorithm based on modified phasor angle difference |
| WU Ziliang,LI Yinhong,LI Ming,LI Jingjing |
| (State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology), Wuhan 430074, China;Electric Power Research Institute, CSG, Guangzhou 510080, China) |
| Abstract: |
| The phasor angle difference applied in traditional Fourier frequency measurement algorithm cannot correctly reflect the real difference, resulting the principle error. Therefore, Fourier frequency measurement algorithm based on modified phasor angle difference is proposed. As phasor angle, which acts as intermediate variable, is amended by correction factor, and the theoretical error of traditional Fourier algorithm is eliminated. The algorithm is not sensitive to the noise and harmonics, which is inherited from Fourier algorithm. Besides, to overcome the paradox that traditional iterative algorithm cannot have both accuracy and speed, quadratic interpolation technology is adopted for revising the sample sequences. Simulation results show that, compared with the traditional Fourier algorithm, both computing speed and accuracy of the proposed algorithm are improved under the same hardware environment. |
| Key words: power system frequency measurement Fourier algorithm phasor angle difference correction factor quadratic interpolation sampling sequence iteration |
