Investigation of novel methodologies using reactive power reserves for online voltage stability margin monitoring and control

dc.contributor.advisor Venkataramana Ajjarapu
dc.contributor.author Leonardi, Bruno
dc.contributor.department Electrical and Computer Engineering
dc.date 2018-08-11T19:13:19.000
dc.date.accessioned 2020-06-30T02:40:58Z
dc.date.available 2020-06-30T02:40:58Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2011
dc.date.embargo 2013-06-05
dc.date.issued 2011-01-01
dc.description.abstract <p>As the amount of uncertainty in online power system operations grows, new methodologies need to be devised in order to timely monitor and control the power grid. In this work, novel techniques for online voltage stability margin monitoring and control have been developed with a focus on reactive power reserves.</p> <p>The maintenance of adequate reactive power reserves (RPRs) is a critical step in avoiding a voltage collapse. A thorough investigation of the relationship between different definitions of reactive power reserves and how they are related to voltage stability margin (VSM) is performed.</p> <p>Multi-linear regression models are used to relate RPRs and VSM. Several operating conditions and a significantly large number of different network topologies, including NERC category B, C and D outages are considered as well. A classification tool is then developed in order to identify which regression model needs to be used based on system conditions and network topology. The approach is tested in the IEEE 30 bus test system and in a reduced case of the eastern power system interconnection of the United States. Results have shown that the approach can monitor voltage stability margin in real time based on the amount of system wide reactive power reserves.</p> <p>In case degenerative system conditions are identified, control actions need to be put in place to increase the amount of RPRs and system VSM. A novel control method is proposed here in order to identify the location and amount of control necessary to recover RPRs, VSM and to remove existing voltage violations. The approach is based on the identification of a critical set of generators that, if exhausted, will directly contribute to a voltage collapse.</p> <p>Potential control actions are investigated in order to recover those critical reactive power reserves, namely: active power re-dispatch, capacitor switching, active and reactive power load shedding. The effectiveness of each control variables on RPRs is calculated using reactive power reserve sensitivities, a concept introduced in this work. Once these sensitivities are calculated, the problem of recovering RPRs and VSM is formulated as convex quadratic optimization problem with a reduced dimension.</p> <p>Results on the IEEE 30 bus test system and the IEEE 118 bus test system are used to illustrate the efficacy of the approach.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/12193/
dc.identifier.articleid 3142
dc.identifier.contextkey 2808340
dc.identifier.doi https://doi.org/10.31274/etd-180810-2825
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/12193
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/26384
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/12193/Leonardi_iastate_0097E_11981.pdf|||Fri Jan 14 19:14:55 UTC 2022
dc.subject.disciplines Electrical and Computer Engineering
dc.subject.keywords Machine learning techniques
dc.subject.keywords Power systems stability
dc.subject.keywords Reactive power reserves
dc.subject.keywords Real time control
dc.subject.keywords Voltage stability control
dc.subject.keywords Voltage stability margin monitoring
dc.title Investigation of novel methodologies using reactive power reserves for online voltage stability margin monitoring and control
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication a75a044c-d11e-44cd-af4f-dab1d83339ff
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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