The use of Synchronized Phasor Measurement to Determine Power System Stability, Transmission Line Parameters and Fault Location
Jiao, Yushi (2011) The use of Synchronized Phasor Measurement to Determine Power System Stability, Transmission Line Parameters and Fault Location. Other thesis, Murdoch University.
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In recent years, voltage instability has been a big issue in power systems. There are many factors contributing to voltage collapse which might cause blackouts, such as the demands of consumption growth, the influence of harmonic components and reactive power constraints. These factors are very difficult to predict in real environment.
High-voltage transmission lines are an important part of the power system. As the operation of the power grid expands, the demands on long distance transmission lines will increase. These lines are often exposed to large diverse geographical areas with complex terrain and weather conditions. If a fault occurs in a transmission line, it can be very hard to find and report it. It can take a long time to clear a fault and there is the chance of repeated failure. Even if the fault is fixed, the new steady-state of the power system needs to be monitored to avoid failure again.
However, the synchronized phasor measurement unit is a new technology that has been developed to solve these problems. These phasor measurement units give the magnitude and angle of voltages and currents in real synchronized time in different locations. The Discrete Fourier Transform is a good approach to analysis from an analogue signal to a digital signal. This thesis is based on mathematic modelling of a two bus system that will be used to derive methods to predict voltage stability and determine transmission line parameters and fault locations. This thesis also gives examples on a two-bus system to estimate the measurements subject to off-nominal frequencies and electrical noise. The simulation software that is used in these investigations are ICAP and Matlab. Applications and suggestions for further research into synchronized phasors are also presented in this thesis.
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