Optimal Design of Distributed Generator Capacity in Microgrids Considering Life Cycle Cost

Haoming Liu, Fengqin Kang, Shanshan Li, and Xiaoling Yuan


Microgrid, stand-alone system, distributed generators, optimal sizing, life cycle cost (LCC)


For the optimal sizing of distributed generators in a stand-alone microgrid, the minimum annual life cycle cost (LCC) of the microgrid, which includes equipment investment cost, equipment replacement cost, microgrid operation cost (contains equipment operation and maintenance cost, fuel cost and environment-pollution penalty), failure cost (payment to customers due to outages), and equipment discard cost after the life cycle, is taken as the objective to establish the optimization mathematical model. A hybrid optimization algorithm, in which particle swarm optimization (PSO) is main and genetic algorithm (GA) is auxiliary, is proposed to solve the optimization mathematical model for escaping from the local optimum and ensuring the accuracy of the global optimum. For an example microgrid, the optimal sizing scheme of distributed generators is found among a range of configurations that meet certain system constraints to validate the correctness and effectiveness of the model and hybrid algorithm proposed.

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