Abstract:
In this work, the optimization of an off-grid micro-hybrid system is evaluated.
This is conducted with the estimation of the proper sizing of each element and
the steady-state voltage, frequency, and power responses of the microgrid.
Kangaroo Island in South Australia is considered to be the test case location and
the grid incorporates solar PV (photo-voltaic), diesel generator, battery storage,
and wind turbine. Optimal sizing of the studied microgrid is carried out for four
various power dispatch techniques: (i) cycle charging (CC), (ii) generator order
(GO), (iii) load following (LF), and (iv) combined dispatch (CD). The proposed
off-grid micro-hybrid is optimized for three performance indices; minimal
Levelized Cost of Energy (LCOE), CO2 emission, and Net Present Cost (NPC).
Using iHOGA (improved hybrid optimization by genetic algorithm), microgrid
optimization software, all the above-mentioned dispatch strategies have been
implemented and following this, MATLAB/Simulink platform has been used for
the steady-state studies. The results show that the LF strategy is the utmost
optimum dispatch technique in terms of the studied performance indices i.e.
considering the optimal size and voltage and frequency responses. The results
obtained from these studies provide a pathway for the estimation of the
resource-generation-load combination for the islanded off-grid microgrid for its
optimal operation with the various dispatch strategies.
