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

1
School of Economics and Management, North China Electric Power University, Beijing 102206, China
2
State Grid Jibei Electric Power Company Engineering Management Company, Beijing 100070, China
*
Author to whom correspondence should be addressed.
Sustainability 2018, 10(11), 4198; https://doi.org/10.3390/su10114198
Received: 25 September 2018 / Revised: 3 November 2018 / Accepted: 5 November 2018 / Published: 14 November 2018
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Abstract

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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