Background: This paper presents an optimal power delivery system for a hybrid microgrid
consisting of a solar PV, wind farm, battery storage and diesel generator. The fuzzy logicbased
control approach is used to match the generation and consumers’ demand.
Methods: The load demand is assumed to vary hourly in a day and season to season in a year. The
frequency of AC (alternating current) bus may deviate from standard frequency due to supplydemand
imbalance and thus make the system unstable.
Results: To overcome the situation, the controller actuates a control signal to maintain system frequency.
Frequency deviation is an indication of the load change and battery voltage (state of charge)
is taken as input. In case of excessive generation, the extra power will be absorbed in the dump load
for an isolated system.
Conclusion: Whereas, for a grid-connected system, the surplus generation is fed into the grid. This
cost-effective control method ensures the balance between generation and load demand at all times.