TY - GEN
T1 - Analysis and research of digitized sampling characteristics in smart substations
AU - Bu, Qiangsheng
AU - Yu, Liu
AU - Yuan, Yubo
AU - Lei, Gao
AU - Li, Peng
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2014/12/18
Y1 - 2014/12/18
N2 - Digitized sampling adopts decentralized, independent sampling mode, which introduces a new problem of data synchronization to secondary system of substations, especially for relay protections. This paper analyzes the time delay of every sections in sampling and the causes of non-synchronized sampling data. It states two general applied data synchronization method in smart substations at present, one method is based on external synchronizing signal while the other is based on interpolation method for resampling. The paper also compares two important indexes of digital sampling, rated delay time and phase error. Then the paper presents two methods, steady-state indirect method and time-scale direct method, to measure sampling delay and in turn to solve the problems of data synchronization. The test data of practical project shows that both two methods are able to achieve microsecond precision, but time-scale direct method is more accurate and stable. At last, the paper gives some precautions and recommendations for application of digital sampling in smart substations.
AB - Digitized sampling adopts decentralized, independent sampling mode, which introduces a new problem of data synchronization to secondary system of substations, especially for relay protections. This paper analyzes the time delay of every sections in sampling and the causes of non-synchronized sampling data. It states two general applied data synchronization method in smart substations at present, one method is based on external synchronizing signal while the other is based on interpolation method for resampling. The paper also compares two important indexes of digital sampling, rated delay time and phase error. Then the paper presents two methods, steady-state indirect method and time-scale direct method, to measure sampling delay and in turn to solve the problems of data synchronization. The test data of practical project shows that both two methods are able to achieve microsecond precision, but time-scale direct method is more accurate and stable. At last, the paper gives some precautions and recommendations for application of digital sampling in smart substations.
KW - Data synchronization
KW - Rated delay time
KW - Steady state indirect method
KW - Time scale direct method
UR - https://www.scopus.com/pages/publications/84925275264
U2 - 10.1109/POWERCON.2014.6993647
DO - 10.1109/POWERCON.2014.6993647
M3 - 会议稿件
AN - SCOPUS:84925275264
T3 - POWERCON 2014 - 2014 International Conference on Power System Technology: Towards Green, Efficient and Smart Power System, Proceedings
SP - 1822
EP - 1827
BT - POWERCON 2014 - 2014 International Conference on Power System Technology
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2014 International Conference on Power System Technology, POWERCON 2014
Y2 - 20 October 2014 through 22 October 2014
ER -
