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- W2532271156 abstract "This thesis investigates voltage instability leading to voltage collapse in PSS/E andhow such scenario can be prevented by the use of a system protection model whichhas been proposed and developed in this thesis. The model sees the system as awhole and can initiate a system protection response based on a voltage stabilityindicator in parallel with signals from over excitation limiters (OELs).Three case studies were performed for evaluating two well-known voltage stabilityindicators in the literature, namely the Impedance Stability Index (ISI) and theTransmission Path Stability Index (TPSI). The two first studies showed that oneof two methods to calculate the ISI gave a more stable result, which was selectedto be used in later case studies. Both indicators were then used and evaluated in athird case study consisting of the Nordic 32-bus test system developed by SvenskaKraftnat. In this case study, two separate contingency scenarios were designed tocause a voltage collapse. It was found that the calculations of the ISI were timeconsuming and did not indicate the margin to voltage collapse as clearly as theTPSI did.The TPSI and signals from OELs were used as input signals in the system protectionmodel designed to protect the power system. The model was designed togenerate control signals to change Automated Voltage Regulator (AVR) set-pointsof synchronous generators and initiate load shedding schemes. The functionalityof the system protection model was successfully verified when its implementationin PSS/E was able to prevent the voltage collapse scenarios designed in the thirdcase study. Voltage collapse in the first scenario was prevented by increasing AVRset-points when OELs were activated and the TPSI value was lower than 0.15. Thesecond scenario was more severe and it was necessary to utilize both increasingAVR set-points and as load shedding which was initialized when the TPSI droppedbelow a threshold of 0.05." @default.
- W2532271156 created "2016-10-28" @default.
- W2532271156 creator A5004483159 @default.
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- W2532271156 date "2016-01-01" @default.
- W2532271156 modified "2023-09-23" @default.
- W2532271156 title "Development of a system protection model against voltage collapse in PSS/E" @default.
- W2532271156 hasPublicationYear "2016" @default.
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