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dc.contributorDepartment of Electrical and Electronic Engineeringen_US
dc.contributor.advisorKaraagac, Ulas (EEE)en_US
dc.contributor.advisorBu, Siqi (EEE)en_US
dc.creatorOuyang, Chenxi-
dc.identifier.urihttps://theses.lib.polyu.edu.hk/handle/200/12956-
dc.languageEnglishen_US
dc.publisherHong Kong Polytechnic Universityen_US
dc.rightsAll rights reserveden_US
dc.titleA computationally efficient impedance scanning of inverter-based resourcesen_US
dcterms.abstractImpedance-based stability assessment (IBSA) is an effective method to identify stability problems of inverter-based resources (IBRs) in modern power systems. The desired accuracy can be achieved by using the electromagnetic transient (EMT)-type impedance scanning method. This method also allows extracting the impedance models of manufacturer-specific models, thus, has gained popularity among transmission system operators (TSOs). In single-sinusoidal (SS) method, a small SS signal voltage perturbation is used to obtain the impedance/admittance of an IBR. The major drawback of the SS method is its high computational burden as the EMT simulations are performed at each frequency.en_US
dcterms.abstractThe multi-sinusoidal (MS) method may be used to improve the computational efficiency of EMT-type impedance scanning. However, the high magnitudes of the superimposed MS signals can cause saturation in converter controls and/or activation of transient functions. These large magnitudes can be reduced by using a phase shift approach such as quadratic phase shift (QPS) and optimized phase shift (OPS).en_US
dcterms.abstractIn this thesis, SS and MS methods for impedance scanning are investigated and evaluated. To benefit from the advantages of both schemes, a hybrid scanning method is proposed including perturbation signal, magnitude, and frequency segmentation settings. Additionally, a modified quadratic phase shift (MQPS) scheme is proposed for reducing the high magnitudes of MS signals. All methods are validated and compared using the average value model of doubly fed induction generator (DFIG) and full-size converter (FSC)-based wind parks (WPs). The guidelines and recommendations are provided for the proper usage of the proposed hybrid scanning in the sub-synchronous frequency range.en_US
dcterms.extent72 pages : color illustrationsen_US
dcterms.isPartOfPolyU Electronic Thesesen_US
dcterms.issued2024en_US
dcterms.educationalLevelM.Phil.en_US
dcterms.educationalLevelAll Masteren_US
dcterms.LCSHElectric power system stabilityen_US
dcterms.LCSHRenewable energy sourcesen_US
dcterms.LCSHElectric power distributionen_US
dcterms.LCSHHong Kong Polytechnic University -- Dissertationsen_US
dcterms.accessRightsopen accessen_US

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Please use this identifier to cite or link to this item: https://theses.lib.polyu.edu.hk/handle/200/12956