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The use of synchrophasors in analysing voltage stability and detecting voltage collapse

Gill, Daniel (2016) The use of synchrophasors in analysing voltage stability and detecting voltage collapse. Honours thesis, Murdoch University.

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Voltage stability is an incredibly important concept in power systems engineering. Voltages can become unstable due to numerous reasons, but the most common reason is when the power generation and load gap is too large. In the worst case scenario, voltage instability can cause voltage collapse. Voltage collapse refers to the shutdown of a power system due to its inability to maintain adequate bus voltage levels. When the event of voltage collapse begins in a power system, circuit protection systems can become unstable and inoperable.

With the increasing complexity of the world’s power transmission networks, it is becoming more and more difficult to analyse and maintain power system stability. This report looks at how four voltage stability analysis methods, namely, the Voltage Change Index (VCI), the Voltage Collapse Proximity Indicator (VCPI), Continuation Power Flow (CPF) and the New Voltage Stability Index (NVSI), can be used in conjunction with synchrophasor measurements to analyse voltage stability and detect voltage collapse.

Results show that the NVSI is the best analysis method as it can detect the voltage collapse point as well as give a good indication of the voltage stability of a system. The VCPI can predict voltage collapse under specific scenarios, but it does not effectively show how close the system is to voltage collapse at a given operating point. The VCI was determined to not be useful in detecting voltage collapse, but it does, however, provide a useful bus ranking system that lists each load bus from ‘strongest’ to ‘weakest’ which in turn provides an indication of relative bus voltage stability levels. The CPF method was found to not work well with synchrophasor measurements.

Item Type: Thesis (Honours)
Murdoch Affiliation(s): School of Engineering and Information Technology
Supervisor(s): Crebbin, Gregory
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