Xinan Wang

US Patent:

20180156886, Jun 7, 2018

Filed:

Oct 18, 2017

Appl. No.:

15/787365

Inventors:

Xiao Lu - Nanjing, CN
Xinan Wang - Santa Clara CA, US
Di Shi - San Jose CA, US
Zhiwei Wang - Santa Clara CA, US
Jianyu Luo - Nanjing, CN
Chunlei Xu - Nanjing, CN

International Classification:

G01R 35/00
G01R 19/25

Abstract:

Data quality of Phasor Measurement Unit (PMU) is receiving increasing attention as it has been identified as one of the limiting factors that affect many wide-area measurement system (WAMS) based applications. In general, existing PMU calibration methods include offline testing and model based approaches. However, in practice, the effectiveness of both is limited due to the very strong assumptions employed. This invention presents a novel framework for online error detection and calibration of PMU measurement using density-based spatial clustering of applications with noise (DBSCAN) based on much relaxed assumptions. With a new problem formulation, the proposed data mining based methodology is applicable across a wide spectrum of practical conditions and one side-product of it is more accurate transmission line parameters for the energy management system (EMS) database and protective relay settings. Case studies are presented to demonstrate the effectiveness of the proposed method.