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Algorithm for voltage stability control in a power system network with integrated microgrid
Author(s)
Lumina, Sampi Denis
Date Issued
2022
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
The electrical power system is a real-time energy supply system designed to generate,
transport, and supply power to the load. As a rule, the electrical power system is
planned to operate in stable conditions and correct loading conditions. However, these
design expectations can be strained due to disturbance. Because of either the
environmental concern or depletion of traditional energy source fossil fuels. The option
of renewable energy has gained interest for its integration into the power system. The
availability of solar has established potential demand for the rapid growth of solar
photovoltaic (PV) energy connection to existing power grids at transmission and
distribution levels.
The integration of a microgrid photovoltaic system into the main utility is likely to bring
some technical problems that request the upgrade of the power system to a smarter
energy supply system that handles the dynamic characteristic of the power system in
various operating states. One of those challenges can be described as voltage stability.
The impacts of connecting a photovoltaic system to existing grids were considered with
emphasis on the IEEE 9 bus transmission network. The existing grid is subject to
dynamic load disturbance with a corresponding increase of 35% in power consumption.
The dynamic increase of power in a stage of 5% for every 2 seconds of the real-time
simulation produces a disturbance that leads to voltage instability in the power system.
Developing a Real-time Digital Simulator Computer-Aided Design (RSCAD) model of
the power network case study, this thesis aims to study the real challenges of
integration of PV microgrid into the power system network considering the disturbance.
The implementation of an algorithm, which considers the dynamic behaviour of the
power system, was materialised by the modelling of a controller that monitors both the
PV plant and the power system behaviours in an effort of restoring the voltage stability
when the system generator failed.
When the voltage collapse beyond the stability index of 0.95 p.u due to increased power
consumption of the load, the controller shall generate a signal command to the inverter
to allow a dynamic flow of power from the PV to the power system. Hence, the thesis
contributes to the analysis of the stability of voltage in the electrical grid system with an
integrated microgrid, by providing valuable algorithms for voltage stability control of the
power system's electrical network with the integrated photovoltaic system in the RTDS
environment.
transport, and supply power to the load. As a rule, the electrical power system is
planned to operate in stable conditions and correct loading conditions. However, these
design expectations can be strained due to disturbance. Because of either the
environmental concern or depletion of traditional energy source fossil fuels. The option
of renewable energy has gained interest for its integration into the power system. The
availability of solar has established potential demand for the rapid growth of solar
photovoltaic (PV) energy connection to existing power grids at transmission and
distribution levels.
The integration of a microgrid photovoltaic system into the main utility is likely to bring
some technical problems that request the upgrade of the power system to a smarter
energy supply system that handles the dynamic characteristic of the power system in
various operating states. One of those challenges can be described as voltage stability.
The impacts of connecting a photovoltaic system to existing grids were considered with
emphasis on the IEEE 9 bus transmission network. The existing grid is subject to
dynamic load disturbance with a corresponding increase of 35% in power consumption.
The dynamic increase of power in a stage of 5% for every 2 seconds of the real-time
simulation produces a disturbance that leads to voltage instability in the power system.
Developing a Real-time Digital Simulator Computer-Aided Design (RSCAD) model of
the power network case study, this thesis aims to study the real challenges of
integration of PV microgrid into the power system network considering the disturbance.
The implementation of an algorithm, which considers the dynamic behaviour of the
power system, was materialised by the modelling of a controller that monitors both the
PV plant and the power system behaviours in an effort of restoring the voltage stability
when the system generator failed.
When the voltage collapse beyond the stability index of 0.95 p.u due to increased power
consumption of the load, the controller shall generate a signal command to the inverter
to allow a dynamic flow of power from the PV to the power system. Hence, the thesis
contributes to the analysis of the stability of voltage in the electrical grid system with an
integrated microgrid, by providing valuable algorithms for voltage stability control of the
power system's electrical network with the integrated photovoltaic system in the RTDS
environment.
Additional information
Thesis (MEng (Electrical Engineering)--Cape Peninsula University of Technology, 2022
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