| 引用本文: | 王铀程,陈 蓉,杨 勇.基于改进TLS-ESPRIT与自卷积窗的谐波与间谐波检测算法[J].电力系统保护与控制,2023,51(17):159-168.[点击复制] |
| WANG Youcheng,CHEN Rong,YANG Yong.Harmonic and inter-harmonic detection algorithm based on improved TLS-ESPRIT and a self-convolution window[J].Power System Protection and Control,2023,51(17):159-168[点击复制] |
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| 摘要: |
| 随着光伏发电系统大规模接入电网，不可避免地带来了严重的谐波污染问题。为了有效监测光伏并网系统输出电流的谐波、间谐波，提出了一种基于改进快速最小二乘法-旋转不变法(total least squares-estimation of signal parameters via rotational invariance technique, TLS-ESPRIT)与2阶Blackman-Harris自卷积窗相结合的检测方法。首先对待测信号进行三次采样并利用快速TLS-ESPRIT算法检测频率。随后对检测结果基于简化K-means聚类算法进行分析，提取出真实的谐波分量。最后结合2阶Blackman-Harris自卷积窗对信号进行加窗插值计算，准确估算出其幅值、相位信息，实现了谐波、间谐波的高精度检测。仿真算例和现场数据测试结果表明，所提方法相较于传统方法具有更高的谐波、间谐波检测精度，且抗干扰能力更强。 |
| 关键词: 光伏并网逆变器 改进TLS-ESPRIT K-means聚类 2阶Blackman-Harris自卷积窗 加窗插值算法 |
| DOI：10.19783/j.cnki.pspc.221776 |
| 投稿时间：2022-11-08修订日期：2022-12-30 |
| 基金项目:国家自然科学基金项目资助(52007127，51977136) |
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| Harmonic and inter-harmonic detection algorithm based on improved TLS-ESPRIT and a self-convolution window |
| WANG Youcheng,CHEN Rong,YANG Yong |
| (School of Rail Transportation, Soochow University, Suzhou 215131, China) |
| Abstract: |
| With the large-scale connection of PV power generation systems to the power grid, serious harmonic pollution is inevitable. In order to effectively monitor the output current’s harmonics and inter-harmonics of a PV grid-connected system, this paper proposes a detection method based on the improved fast TLS-ESPRIT algorithm combined with the 2-order Blackman-Harris self-convolution window. First, the signal is sampled three times and the frequency is detected by the fast TLS-ESPRIT algorithm. Then the detection results are analyzed based on the simplified K-means clustering algorithm and the real harmonic components are extracted. Finally, the 2-order Blackman-Harris self-convolution window is used to interpolate the signal, and the amplitude and phase information of the signal are accurately estimated. The high-precision detection of harmonics and inter-harmonics is realized. Simulation and field data test results show that the proposed method has higher harmonic and inter-harmonic detection accuracy and stronger anti-interference ability than the traditional methods. |
| Key words: PV grid-connected inverter improved TLS-ESPRIT K-means clustering 2-order Blackman-Harris self- convolution window windowed interpolation algorithm |
