State estimation and observability analysis for phasor measurement unit measured systems

Korres, GN; Manousakis, NM

dc.contributor.author	Korres, GN	en
dc.contributor.author	Manousakis, NM	en
dc.date.accessioned	2014-03-01T02:14:40Z
dc.date.available	2014-03-01T02:14:40Z
dc.date.issued	2012	en
dc.identifier.issn	17518687	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30082
dc.subject.other	Accurate measurement	en
dc.subject.other	Branch currents	en
dc.subject.other	Bus voltage	en
dc.subject.other	Coefficient matrix	en
dc.subject.other	Convergence properties	en
dc.subject.other	Current phasors	en
dc.subject.other	Estimated state	en
dc.subject.other	Estimation performance	en
dc.subject.other	IEEE 118-bus system	en
dc.subject.other	Ill-conditioning	en
dc.subject.other	Measured system	en
dc.subject.other	Measurement Jacobian matrix	en
dc.subject.other	Non-iterative	en
dc.subject.other	Observability analysis	en
dc.subject.other	Phasor measurement unit	en
dc.subject.other	Phasor measurement unit (PMUs)	en
dc.subject.other	Phasor measurements	en
dc.subject.other	Polar coordinate	en
dc.subject.other	Rectangular coordinates	en
dc.subject.other	Standard equipments	en
dc.subject.other	State Estimators	en
dc.subject.other	Uncertainty propagation	en
dc.subject.other	Zero injections	en
dc.subject.other	Algorithms	en
dc.subject.other	Phase measurement	en
dc.subject.other	State estimation	en
dc.subject.other	Units of measurement	en
dc.subject.other	Observability	en
dc.title	State estimation and observability analysis for phasor measurement unit measured systems	en
heal.type	journalArticle	en
heal.identifier.primary	10.1049/iet-gtd.2011.0492	en
heal.identifier.secondary	http://dx.doi.org/10.1049/iet-gtd.2011.0492	en
heal.publicationDate	2012	en
heal.abstract	The synchronised phasor measurement units (PMUs) can provide extremely accurate measurements that will improve the state estimation performance and observability. Although full observability based only on PMUs appears very impractical today, it will be the case in a few years when these devices become standard equipment at substations. This paper compares the performances of three state estimation formulations, in terms of the convergence properties and the variance in the estimated states. Phasor measurements, as well as zero injections, are incorporated and either rectangular or polar coordinates can be used to represent the bus voltage and branch current phasors measured by PMUs. Current phasors in polar coordinates may give rise to ill-conditioning problems, which are resolved by conversion into rectangular coordinates format, using the uncertainty propagation theory. The behaviour of the elements in the measurement Jacobian matrix, because of the current measurements, is investigated for possible ill-conditioning of the state estimator coefficient matrix. A non-iterative topological-numerical algorithm is proposed for observability checking and restoration in case of observability loss. The proposed algorithms are demonstrated with the IEEE 14-bus and IEEE 118-bus systems. © 2012 © The Institution of Engineering and Technology.	en
heal.journalName	IET Generation, Transmission and Distribution	en
dc.identifier.doi	10.1049/iet-gtd.2011.0492	en
dc.identifier.volume	6	en
dc.identifier.issue	9	en
dc.identifier.spage	902	en
dc.identifier.epage	913	en