NDLI: Precise measurement of power system frequency and absolute phase based on GPS

Content Provider	IEEE Xplore Digital Library
Author	Zhou Jie Zhang Changyin He Wei Jiang Ping Cheng Chunling
Copyright Year	2002
Description	Author affiliation: Nanjing Autom. Res. Inst., China (Zhou Jie; Zhang Changyin; He Wei; Jiang Ping)
Abstract	A precise calculation method of absolute phase angles and stable power frequency is presented in this paper. Firstly, the absolute phase angle of positive sequence voltages/currents relative to 1 PPS (1 pulse per second) from GPS is calculated by using discrete Fourier transforms (DFT). Then a most direct precise measurement of power frequency excursion /spl Delta/f is proposed by using the absolute phase angles every 1 PPS directly. The main point of the algorithm is that the sampling number of 1 period of fundamental signal can be considered as the reciprocal of nominal frequency for the phase angle-1PPS. The method here not only obtains high accurate frequency and absolute phase angles of entire power systems, but also reduces or eliminates the clock errors caused by crystal oscillators and inconsistency of electric components. So it is very cost-efficient and easy for engineering applications. The experimental results demonstrate the high accuracy of the algorithms. The measurement unit we designed sends measured phase angles and frequency to SCADA systems through the industrial Ethernet per second. This information of the entire power systems can be used for state estimation, prediction of instability and adaptive relaying.
Sponsorship	IEEE Power Eng. Soc. (IEEE PES) Chinese Soc. Electr. Eng. (CSEE) China Electric Power Res. Inst. IEEE/PES Beijing Chapter
Starting Page	1947
Ending Page	1951
File Size	318850
Page Count	5
File Format	PDF
ISBN	0780374592
DOI	10.1109/ICPST.2002.1067873
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-13
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power measurement Frequency measurement Phase measurement Power system measurements Global Positioning System Pulse power systems Discrete Fourier transforms Power system relaying Voltage Sampling methods
Content Type	Text
Resource Type	Article

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