中国电机工程学报2017，Vol.37Issue(3)：705-711,7.DOI:10.13334/j.0258-8013.pcsee.152457
电力系统工频量测伪振荡现象的判别方法
A Method to Identify Pseudo-oscillation of Phasor Measurement in Power Systems
王茂海 1齐霞2
作者信息
- 1. 国家电网华北电力调控分中心,北京市西城区 100053
- 2. 国网冀北电力有限公司经济技术研究院,北京市昌平区 100005
- 折叠
摘要
Abstract
Converters consisting of power electronics may generate harmonics and inter-harmonics in power systems; thereby exert adverse effects, such as pseudo-oscillation, on phasor measurement. To solve this problem, this paper presented a method to identify whether an oscillation is a pseudo oscillation because of measurement errors, or a real oscillation actually happened in real power system. If power system frequency deviated from its rated value, and sampling theorem was not satisfied, higher harmonics above Nyquist frequency would be mapped symmetrically as inter-harmonics under Nyquist frequency in the sampling signal. Under certain conditions, the mapped inter-harmonics would be close to fundamental frequency, resulting in pseudo-oscillations of phasor measurement results. The pseudo-oscillation frequency was the difference between fundamental frequency and inter-harmonics frequency. Concerned with DC converter station, coordination principle for sampling frequency and characteristic harmonics was given. Simulation examples and actual examples were given to verify the analysis conclusion.关键词
电力系统振荡/谐波/间谐波/特征谐波/相量测量Key words
power system oscillation/harmonics/inter-harmonics/characteristic harmonics/phasor measurement分类
信息技术与安全科学引用本文复制引用
王茂海,齐霞..电力系统工频量测伪振荡现象的判别方法[J].中国电机工程学报,2017,37(3):705-711,7.
