Mathematical Modelling and Control of Renewable Energy Systems and Battery Storage Systems
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Intermittent nature of renewable energy sources like the wind and solar energy poses new
challenges to harness and supply uninterrupted power for consumer usage. Though, converting
energy from these sources to useful forms of energy like electricity seems to be promising, still,
significant innovations are needed in design and construction of wind turbines and PV arrays
with BS systems. The main focus of this research project is mathematical modelling and control
of wind turbines, solar photovoltaic (PV) arrays and battery storage (BS) systems. After careful
literature review on renewable energy systems, new developments and existing modelling and
controlling methods have been analysed. Wind turbine (WT) generator speed control, turbine
blade pitch angle control (pitching), harnessing maximum power from the wind turbines have
been investigated and presented in detail. Mathematical modelling of PV arrays and how to
extract maximum power from PV systems have been analysed in detail.
Application of model predictive control (MPC) to regulate the output power of the wind turbine
and generator speed control with variable wind speeds have been proposed by formulating a
linear model from a nonlinear mathematical model of a WT.
Battery chemistry and nonlinear behaviour of battery parameters have been analysed to present
a new equivalent electrical circuit model. Converting the captured solar energy into useful
forms, and storing it for future use when the Sun itself is obscured is implemented by using
battery storage systems presenting a new simulation model.
Temperature effect on battery cells and dynamic battery pack modelling have been described
with an accurate state of charge estimation method. The concise description on power
converters is also addressed with special reference to state-space models. Bi-directional
AC/DC converter, which could work in either rectifier or inverter modes is described with a
cost effective proportional integral derivative (PID/State-feedback) controller.
Authors
Wijewardana, Singappuli MCollections
- Theses [3593]