Scientific mapping of optimisation applied to microgrids integrated with renewable energy systems

•Energy is an essential factor in socio-economic development.•Scientific mapping is used to analyse progress in hybrid microgrid optimisation.•The rise in research in this sector shows that the field is constantly evolving.•Microgrid and multi-objective optimisation have recently become prominent themes.•PV-wind systems are now common, due to lower prices and scientific advancements.