| 引用本文: | 张 赢,魏文震,李 江,等.基于北斗授时的μPMU测量误差综合分析[J].电力系统保护与控制,2021,49(8):83-91.[点击复制] |
| ZHANG Ying,WEI Wenzhen,LI Jiang,et al.Comprehensive measurement error analysis of μPMU based on Beidou time service[J].Power System Protection and Control,2021,49(8):83-91[点击复制] |
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| 摘要: |
| 微型相量测量单元(μPMU)的同步性与时钟源精度密切相关，目前我国电网中已投运的智能设备多以美国GPS为时钟源。伴随北斗系统(BDS)组网完成，采用北斗作为时钟源的设备将逐渐成为主流。首先，研究北斗系统时钟脉冲精度、互感器误差、基波频率及谐波等误差影响因素，揭示各环节对μPMU测量误差的作用机理。然后，评估基于北斗系统的μPMU测量装置相角误差，分析基于频率跟踪的极大似然估计相量误差。最后，评价时钟源、互感器饱和、频率变化、谐波干扰等因素产生的综合误差。通过研究关键影响因素，给出减小测量误差的主要措施。研究成果将为μPMU在配电网的大规模配置提供理论和实践指导。 |
| 关键词: 同步测量 北斗系统 动态跟踪 极大似然估计 微型相量测量单元 |
| DOI：DOI: 10.19783/j.cnki.pspc.200878 |
| 投稿时间：2020-07-23修订日期：2021-01-14 |
| 基金项目:国家自然科学基金项目资助(51977030); 国网内蒙古东部电力有限公司项目资助(SGMDHBOOFCJS1800881) |
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| Comprehensive measurement error analysis of μPMU based on Beidou time service |
| ZHANG Ying1,WEI Wenzhen2,LI Jiang2,SUN Qian2 |
| (1. State Grid Eastern Inner Mongolia Electric Power Co., Ltd., Hulun Buir 021000, China;2. School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China) |
| Abstract: |
| At present, most of the smart devices in service for power systems in China use Global Positioning System (GPS) as a clock source, and the synchronization of the micro Phasor Measurement Unit (μPMU) in a distribution network is related to the accuracy of the clock source. With the completion of the Beidou System (BDS), equipments installed with Beidou will gradually become mainstream. First, the influence mechanism of clock pulse accuracy, transformer performance, frequency fluctuation, and harmonic distortion on the measurement error of μPMU is analyzed comprehensively in this paper. Then, the phase angle error of a μPMU measurement device based on BDS is calculated, and the error of the maximum likelihood estimation based on tracking frequency algorithms is analyzed to give the comprehensive error of μPMU under different phasor estimation methods. Finally, the comprehensive errors caused by the clock source, signal conversion, frequency change, harmonic interference, and other factors, are studied. The relevant methods are also used to reduce measurement error. The conclusion will provide theoretical and practical guidance for the large-scale placement of μPMU in distribution networks.
This work is supported by the National Natural Science Foundation of China (No. 51977030) and Project of State Grid Eastern Inner Mongolia Electric Power Co., Ltd. (No. SGMDHBOOFCJS1800881). |
| Key words: synchronized measurement BDS dynamic tracking maximum likelihood estimation μPMU |
