| 引用本文: | 刘灏,许苏迪,毕天姝,谷松林.基于同步相量数据的间谐波还原算法[J].电力自动化设备,2019,39(1): |
| LIU Hao,XU Sudi,BI Tianshu,GU Songlin.Inter-harmonic reduction algorithm based on synchrophasor measurements[J].Electric Power Automation Equipment,2019,39(1): |
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| 摘要: |
| 随着新能源的快速发展，越来越多的电力电子设备应用在了电网中，导致电力信号中出现了频率为次同步及超同步的间谐波。当这些间谐波严重时会造成次同步振荡，危害电网安全。因此，间谐波的监测预警至关重要。目前，同步相量测量单元(PMU)已在电网中大量装备，这为监测电网中的间谐波提供了可能。基于PMU测量相量，提出了一种间谐波的还原算法。提出了基于复数相量的次/超同步间谐波提取方法。针对频谱分析所得的频率和幅值误差较大的问题，提出了将间谐波的频率和幅值分开求解的思路：基于能量重心法修正间谐波的计算频率；进一步地，提出了基于最小二乘法的间谐波幅值校正方法。通过仿真验证以及电力系统实际录波数据的测试表明，所提方法能够在电气量中含有多个对称和非对称间谐波、高噪声条件下较为准确地计算得到间谐波的频率和幅值。 |
| 关键词: 间谐波 相量测量单元 傅里叶变换 能量重心修正法 电力系统 |
| DOI：10.16081/j.issn.1006-6047.2019.01.023 |
| 分类号:TM711;TM76 |
| 基金项目:国家重点研发计划项目(2017YFB0902900)；国家自然科学基金资助项目(51725702,51627811,51707064)；国网经济技术研究院有限公司资助项目(主动配电网信号特性与作用机理仿真研究及测量装置样机研制) |
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| Inter-harmonic reduction algorithm based on synchrophasor measurements |
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LIU Hao1, XU Sudi1, BI Tianshu1, GU Songlin2
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1.State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.State Grid Economic and Technological Research Institute, Beijing 102209, China
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| Abstract: |
| With the rapid development of renewable energies, more and more power electronic equipments are applied in power grids, resulting in subsynchronous and super-synchronous inter-harmonics in electrical signals. When these inter-harmonics are serious, subsynchronous oscillation will occur. Therefore, the monitoring and warning of inter-harmonics in real time is very important. Nowadays, there are many PMUs(Phasor Measurement Units) ha-ving been deployed in the power system, which provides possibility for monitoring the inter-harmonics. An inter-harmonic reduction algorithm based on phasor measurements of PMUs is proposed. The extraction method of subsynchronous and super-synchronous inter-harmonics based on the complex phasor is proposed to decompose the subsynchronous and super-synchronous harmonics. Aiming at the larger magnitude and frequency errors obtained by the spectrum analysis, the idea to solve the frequency and amplitude of inter-harmonic separately is presented. The calculative frequency of inter-harmonic is corrected by the energy centrobaric correcting method. Then, a correction method for inter-harmonic magnitude based on the least squares method is proposed. The simulation and the test based on the actual recording data of power system show that the frequency and amplitude of inter-harmonics can be calculated accurately by the proposed method under the condition of multiple symmetrical and asymmetrical inter-harmonics and strong noises. |
| Key words: inter-harmonics phasor measurement unit Fourier transform energy centrobaric correcting method electric power systems |
