NDLI: New control scheme in the local system stabilizing controller

Content Provider	IEEE Xplore Digital Library
Author	Sato, Y. Fukui, C. Nakamura, T. Kanehara, K. Maekawa, K. Kojima, M.
Copyright Year	1999
Description	Author affiliation: Res. Lab., Hitachi Ltd., Ibaraki, Japan (Sato, Y.; Fukui, C.)
Abstract	A new control scheme for the local system stabilizing controller (SSC), an adaptive relay system to prevent blackout and maintain frequency of split subsystems with generator shedding and/or load shedding, is described. The most distinctive feature of the scheme is its multiple shedding steps; i.e., primary step and additional steps. This reduces the total amount of control and minimizes control error which may be caused by unmeasured factors such as load dropout by undervoltage relays. In the primary step, shortage control is implemented which is not enough to make the frequency deviation zero, but sufficient to suppress the frequency maximum predicted in real time analysis of dynamic characteristics. In the additional steps, multiple adjustment controls are implemented to revise the frequency deviation of the primary step. The true frequency value is estimated with plural values of measured frequency to deal with load dropout or recovery. The scheme was tested in a power system simulator. Test results showed the amount of shedding was cut 14.9% compared to a conventional scheme.
Starting Page	944
Ending Page	949
File Size	579388
Page Count	6
File Format	PDF
ISBN	0780348931
DOI	10.1109/PESW.1999.747297
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-01-31
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Control systems Frequency estimation Relays Power system dynamics Power system simulation Adaptive systems Programmable control Adaptive control Error correction Frequency measurement
Content Type	Text
Resource Type	Article

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