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This paper proposes the maiden application of a modern meta-heuristically optimised fractional order PID (FOPID) controller for ensuring the voltage stability of a DC microgrid system having PMDC generator coupled to a solar dish-Stirling engine. A significant cost reduction and efficiency enhancement can be achieved by the proposed topology. Popular meta-heuristic optimisation algorithms such as grey wolf optimiser (GWO), mine blast algorithm (MBA) and particle swarm optimisation (PSO) are adopted for tuning the gain constants of the controllers. The major focus of this article is to keep the common DC bus voltage of the microgrid at the desired steady-state value under varying load and varying solar insolation conditions. The results demonstrate the superior performance of the proposed controller.