Publication:
PV Inverter Based Volt/Var Control of Active Distribution Networks with Inverter Reliability Assessment and Enhancement

dc.contributor.advisor Li, Chaojie
dc.contributor.advisor Dong, Joe
dc.contributor.advisor Tong, Ziyuan (Ellie)
dc.contributor.advisor Zhang, Rachel
dc.contributor.author Chai, Qingmian
dc.date.accessioned 2023-01-12T21:51:04Z
dc.date.available 2023-01-12T21:51:04Z
dc.date.issued 2023
dc.date.submitted 2023-01-12T14:39:29Z
dc.description.abstract Traditional passive distribution networks can not sufficiently handle the voltage stability issues brought by the increasingly integrated PV systems, while an active distribution network, which features active management of distributed energy resources, can flexibly utilise PV inverters to provide a volt/var control (VVC) function to regulate the network voltage. However, PV inverters are vulnerable power electronics devices and utilising them for additional VVC support can further degrade their reliability, leading to shortened inverter lifetime and impaired economic benefits. In this regard, the thesis focuses on addressing the PV inverter reliability issues in VVC methods, via assessing the PV inverter reliability in VVC and proposing advanced PV inverter based VVC methods considering inverter reliability enhancement. The thesis consists of four stages of my research. Firstly, a comprehensive PV inverter reliability assessment approach is developed to evaluate inverter lifetime when used for VVC functions, and the impacts of the PV inverter based VVC on inverter lifetime are successfully quantified. Secondly, a PV inverter reliability constrained VVC method is proposed in which the constraints to enhance inverter reliability are developed with a restriction factor to regulate inverter apparent power outputs. This method can efficiently minimise network power loss and curtailed PV power, while guaranteeing long inverter lifetime. Thirdly, a PV inverter reliability constrained VVC approach with power smoothing is proposed, in which an inverter power smoothing scheme with high control flexibility is developed by utilising a power smoothing factor to constrict variations of inverter apparent power outputs. Additionally, a penalty convex-concave procedure (CCP) solution method is developed to solve the non-convex optimisation problem with high computing efficiency. Fourthly, a multi-objective PV inverter based VVC method is proposed to simultaneously minimise network power loss and inverter apparent power output, and a Pareto front analysis method is developed to select a solution to achieve efficient power loss reduction with expected inverter lifetime. All the proposed methods apply advanced network operating models and optimisation methods to address uncertainties. These methods have been successfully demonstrated and tested through comprehensive case studies, and numerical simulation results verified the feasibility and high efficiency of the proposed methods.
dc.identifier.uri http://hdl.handle.net/1959.4/100900
dc.language English
dc.language.iso en
dc.publisher UNSW, Sydney
dc.rights CC BY 4.0
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject.other Active distribution network
dc.subject.other PV inverter
dc.subject.other reliability analysis
dc.subject.other volt/var control
dc.title PV Inverter Based Volt/Var Control of Active Distribution Networks with Inverter Reliability Assessment and Enhancement
dc.type Thesis
dcterms.accessRights open access
dcterms.rightsHolder Chai, Martin
dspace.entity.type Publication
unsw.accessRights.uri https://purl.org/coar/access_right/c_abf2
unsw.date.workflow 2023-01-12
unsw.identifier.doi https://doi.org/10.26190/unsworks/24607
unsw.relation.faculty Engineering
unsw.relation.faculty Other UNSW
unsw.relation.school School of Electrical Engineering and Telecommunications
unsw.relation.school School of Electrical Engineering and Telecommunications
unsw.relation.school School of Electrical Engineering and Telecommunications
unsw.relation.school School of Electrical Engineering and Telecommunications
unsw.subject.fieldofresearchcode 400805 Electrical energy transmission, networks and systems
unsw.thesis.degreetype PhD Doctorate
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