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Cooperation between Two Micro-Grids Considering Power Exchange: An Optimal Sizing Approach Based on Collaborative Operation

School of Economics and Management, North China Electric Power University, Beijing 102206, China
State Grid Jibei Electric Power Company Engineering Management Company, Beijing 100070, China
Author to whom correspondence should be addressed.
Sustainability 2018, 10(11), 4198;
Received: 25 September 2018 / Revised: 3 November 2018 / Accepted: 5 November 2018 / Published: 14 November 2018
PDF [3608 KB, uploaded 14 November 2018]


Optimal sizing of single micro-grid faces problems such as high life cycle cost, low self-consumption of power generated by renewable energy, and disturbances of intermittent renewable energy. Interconnecting single micro-grids as a cooperative system to reach a proper size of renewable energy generations and batteries is a credible method to promote performance in reliability and economy. However, to guarantee the optimal collaborative sizing of two micro-grids is a challenging task, particularly with power exchange. In this paper, the optimal sizing of economic and collaborative for two micro-grids and the tie line is modelled as a unit commitment problem to express the influence of power exchange between micro-grids on each life cycle cost, meanwhile guaranteeing certain degree of power supply reliability, which is calculated by Loss of Power Supply Probability in the simulation. A specified collaborative operation of power exchange between two micro-grids is constructed as the scheduling scheme to optimize the life cycle cost of two micro-grids using genetic algorithm. The case study verifies the validity of the method proposed and reveal the advantages of power exchange in the two micro-grids system. The results demonstrate that the proposed optimal sizing means based on collaborative operation can minimize the life cycle cost of two micro-grids respectively considering different renewable energy sources. Compared to the sizing of single micro-grid, the suggested method can not only improve the economic performance for each micro-grid but also form a strong support between interconnected micro-grids. In addition, a proper price of power exchanges will balance the cost saving between micro-grids, making the corresponding stake-holders prefer to be interconnected. View Full-Text
Keywords: micro-grids; power exchange; optimal sizing; collaborative operation; unit commitment micro-grids; power exchange; optimal sizing; collaborative operation; unit commitment

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Huang, Y.; Yang, L.; Liu, S.; Wang, G. Cooperation between Two Micro-Grids Considering Power Exchange: An Optimal Sizing Approach Based on Collaborative Operation. Sustainability 2018, 10, 4198.

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