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This study endeavours an effective frequency control of renewable‐based isolated two‐area interconnected microgrid (ICμG) without battery, incorporating wind power generation in area‐1, dish‐Stirling solar power generation system in area‐2 and other common distributed generation systems such as diesel engine driven generator, plug‐in hybrid electric vehicle, heat pump and freezer in both the areas. A recently developed heuristic optimisation technique called water cycle algorithm (WCA) is applied to optimally tune the parameters of the non‐integer fractional‐order proportional‐integral‐derivative (FOPID) controllers employed with ICμG. Application of WCA‐based FOPID controllers in frequency control two‐area ICμG without battery is a novel work. The comparative performance analysis of proportional‐integral‐derivative (PID), PID with filter and non‐integer order‐based FOPID controller with their gains …