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Online monitoring and visualizing of a generator’s capability with Simulink

Khadka, Prabesh
Master thesis
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URI
https://hdl.handle.net/11250/2644683
Date
2019
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  • Master i teknologi [170]
Abstract
The power systems today are becoming more larger, complex and are operating closer to their

security and stability limits particularly due to an increase in load demands and number

of environmental concerns. Voltage stability has been a major subject of discussion and

concern in electric power system operation and planning worldwide. Firstly, this thesis aims

to do the survey on voltage stability and collapse phenomena in order to get insights into

the mechanisms, causes, and prevention techniques to avoid such.

The dynamic long-term voltage stability analysis is carried out using a free and open source,

MATLAB based-PSAT software taking a test power system. The influence of load models,

overexcitation limiter and transformer load tap changers on voltage collapse are investigated

as a part of the thesis. It is observed that the constant power load has a greater impact

on the voltage instability as it tries to restore the load unlike constant impedance and the

constant current loads.

Furthermore, a mathematical model for drawing the generator PQ capability diagram is

presented and implemented in MATLAB software environment. For improved visualization

and user interactions, a visualization tool is developed using the Graphical User Interface.

In addition, the temperature development in the rotor and stator of the 103 MVA hydrogenerator at ‘Åbjøra’ in Norway, is investigated in the same visualization tool utilizing the

already developed thermal model.

For increased accuracy of the results from dynamic voltage analysis, development and use

of more accurate power system component models is recommended. Moreover, the effect

of changing armature voltage and the direct axis synchronous reactance on PQ capability

diagram can be investigated under further study.
Publisher
University of South-Eastern Norway
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