NDLI: Low-order controller design using remotely measured time delayed signals for stabilisation of equivalent power grid

Content Provider	IET Digital Library
Author	Kishor, Nand Seppänen, Janne M. Turunen, Jukka Nikkilä, Antti Juhani Haarla, Liisa C. Purwar, Shubhi
Abstract	This study discusses the use of time-delayed remote signals available through phasor measuring units (PMUs) for low-order controller design in order to stabilise the power oscillations in the range of 0.3–0.42 Hz between two areas. In the proposed approach, first synchronisation measures are determined among the group of generators located in two areas. Then, an index that characterises the joint observability and controllability property in terms of Hankel singular values is defined as a criterion to preselect the remote feedback signal. Following this, a low-order controller design based on minimisation of H ∞ norm is considered. The measurement redundancy is taken into account in controller design using rotor angle, power flow or speed deviation as feedback signal from one of the generators. Additionally, if some specific PMU fails to provide measurements from a chosen generator, then controller effectiveness is guaranteed using signal from other generator in the same area. The performance of controller is verified considering single-step and multi-step disturbances applied to the reference voltage of exciter system. The comparison with design functions such as H 2 norm, complex stability radius and spectral abscissa are also presented. The analytical results confirm using H ∞ design algorithm provides better dynamic performance.
Starting Page	2575
Ending Page	2585
Page Count	11
ISSN	17518687
Volume Number	9
e-ISSN	17518695
Issue Number	Issue 16, Dec (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/9/16
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2015.0268
Journal	IET Generation, Transmission & Distribution
Publisher Date	2015-12-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	A.C. Machine Complex Stability Radius Control of Electric Power System Controller Delay Distributed Parameter Control System Electric Generators Equivalent Power Grid Stabilisation Exciter System Frequency 0.3 Hz to 0.42 Hz Generator Hankel Singular Value H∞ Norm Minimisation H∞ Optimisation Load Flow Low-order Controller Design Measurement Redundancy Minimisation Multistep Disturbance Optimisation Technique Phasor Measurement Phasor Measuring Unit PMU Power Flow Power Grid Power Oscillation Power System Control Power System Measurement And Metering Power System Stability Power Transmission, Distribution And Supply Remote Feedback Signal Rotor Angle Rotors Spectral Abscissa Speed Deviation Synchronisation Measure Time Delayed Remote Signal
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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