Online Monitoring and Visualizing of a Generator's Capability with Modelica. Eirik Bakko Master's thesis, University of South-Eastern Norway, Porsgrunn, May, 2019. abstract bibtex In the electric utility industry, voltage stability issues need to be studied. Voltage stability involves a power systems proficiency to keep the voltage at all buses in the system within specified limits, when disturbed and under normal conditions. The voltage collapse phe- nomenon occurs when a power system is disturbed by one or a sequence of disturbances that causes a voltage drop. When a power system experiences voltage drop, the demand for reactive power increases. Reserves of reactive power is kept in the systems generators and compensators. In most cases the reserves will be adequate to stabilize the voltage. Occasionally the reserves is less than the demand and this may cause a voltage collapse. A synchronous generator should be able to operate uninterrupted and without overheating. The generator capability curve, shows the area of which a generator can operate safely. Open-instance power system library, or OpenIPSL for short, is a library based on Modelica modelling language and contains power system components. OpenIPSL is used to create a model of the 11-bus system. The model is built based on Prabha Kundur's book: ''Power System Stability and Control''. The 11-bus system is used for dynamic voltage stability analysis with a time domain method. The purpose is to show the outcome of a tap changing transformer, overexcitation limiter in a generator and voltage stability with load character- istics. In this thesis a real time visualizer of a generators capability was built. This visualizer is based on a generator capability curve. Long term voltage stability analysis of the 11-bus system is verified with Kundur's results. When applying a larger load and disconnecting one of the high voltage lines, the demand for reactive power increases. On the highest load level, (load level 3) the field current reaches it's limit and the amount of reactive power pro- duced is not sufficient to avoid a voltage collapse. During simulation, the real time generator capability visualizer created for this model, shows the generators increased production of reactive power while staying within its capability limits.
@mastersthesis{EirikBakko2019,
title = {Online Monitoring and Visualizing of a Generator's Capability with {{Modelica}}},
author = {{Eirik Bakko}},
year = {2019},
month = may,
address = {Porsgrunn},
abstract = {In the electric utility industry, voltage stability issues need to be studied. Voltage stability involves a power systems proficiency to keep the voltage at all buses in the system within specified limits, when disturbed and under normal conditions. The voltage collapse phe- nomenon occurs when a power system is disturbed by one or a sequence of disturbances that causes a voltage drop. When a power system experiences voltage drop, the demand for reactive power increases. Reserves of reactive power is kept in the systems generators and compensators. In most cases the reserves will be adequate to stabilize the voltage. Occasionally the reserves is less than the demand and this may cause a voltage collapse. A synchronous generator should be able to operate uninterrupted and without overheating. The generator capability curve, shows the area of which a generator can operate safely. Open-instance power system library, or OpenIPSL for short, is a library based on Modelica modelling language and contains power system components. OpenIPSL is used to create a model of the 11-bus system. The model is built based on Prabha Kundur's book: ''Power System Stability and Control''. The 11-bus system is used for dynamic voltage stability analysis with a time domain method. The purpose is to show the outcome of a tap changing transformer, overexcitation limiter in a generator and voltage stability with load character- istics. In this thesis a real time visualizer of a generators capability was built. This visualizer is based on a generator capability curve. Long term voltage stability analysis of the 11-bus system is verified with Kundur's results. When applying a larger load and disconnecting one of the high voltage lines, the demand for reactive power increases. On the highest load level, (load level 3) the field current reaches it's limit and the amount of reactive power pro- duced is not sufficient to avoid a voltage collapse. During simulation, the real time generator capability visualizer created for this model, shows the generators increased production of reactive power while staying within its capability limits.},
school = {University of South-Eastern Norway},
annotation = {Master's thesis},
file = {/home/dietmarw/FoU/Publications/zotero/storage/9CGPA9GK/Eirik Bakko_2019_Online monitoring and visualizing of a generator’s capability with Modelica.pdf;/home/dietmarw/FoU/Publications/zotero/storage/GWLS6522/ElevenBus.mo}
}
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Reserves of reactive power is kept in the systems generators and compensators. In most cases the reserves will be adequate to stabilize the voltage. Occasionally the reserves is less than the demand and this may cause a voltage collapse. A synchronous generator should be able to operate uninterrupted and without overheating. The generator capability curve, shows the area of which a generator can operate safely. Open-instance power system library, or OpenIPSL for short, is a library based on Modelica modelling language and contains power system components. OpenIPSL is used to create a model of the 11-bus system. The model is built based on Prabha Kundur's book: ''Power System Stability and Control''. The 11-bus system is used for dynamic voltage stability analysis with a time domain method. The purpose is to show the outcome of a tap changing transformer, overexcitation limiter in a generator and voltage stability with load character- istics. 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