AMI量测用于配电网在线状态估计的可信度建模及分析  

Credibility Modelling and Analysis of AMI Measurements for On-line Distribution State Estimation

作　　者：林佳颖 栾文鹏 余贻鑫[1] 秦超[1] LIN Jiaying1, LUAN Wenpeng2, YU Yixin1, QIN Chao1(1. Key Laboratory of Smart Grid （Tianj in University）, Ministry of Education, Nankai District, Tianj in 300072, China; 2. China Electric Power Research Institute Co., Ltd., Haidian District, Beijing 100192, China)

机构地区：[1]智能电网教育部重点实验室(天津大学),天津市南开区300072 [2]中国电力科学研究院有限公司,北京市海淀区100192

出　　处：《电网技术》2018年第4期1191-1199,共9页Power System Technology

摘　　要：高级量测体系（advanced metering infrastructure,AMI）的推广,提高了中低压配电网系统范围的可观测性。然而,通过召测模式采集的AMI量测存在时间不同步的问题,将这些量测直接用于系统分析会造成较大的误差甚至出现不收敛的情况。针对此问题,该文提出一种基于AMI异步量测可信度分析和建模的配电网在线状态估计方法。首先利用即时电表历史量测和配变日负荷曲线,建立基于离线数据样本分析的精细化的AMI异步量测可信度模型;进而运用求得的可信度模型,确定各在线AMI异步量测的权重,估算系统状态的95%置信区间。以116节点中低压一体化配电网为例,分别从局部和全系统的角度,验证了在线场景下系统状态的95%置信区间的准确性和灵敏性。As fundamental equipment of advanced metering infrastructure（AMI）, smart meters provide system wide visibility for distribution network. However, smart meter measurements are often not synchronized possibly causing inaccuracy and divergence when directly applied to system analysis. To cope with this problem, this paper proposed a method of distribution system state estimation incorporating credibility analysis and modelling of smart meter measurements. The credibility model was simulated with actual residential loads taken by high resolution meters and daily load profiles of distribution transformers. With above information, measurement weights were tuned and 95% confidence intervals of the network states were estimated for each scenario and time segment. A 116-node distribution network was selected to validate the proposed method. Simulation results demonstrated its accuracy and sensitivity.

关 键 词：配电网在线状态估计 AMI异步量测 可信度模型 系统状态的95%置信区间 

分 类 号：TM721[电气工程—电力系统及自动化]