Optimal Sizing of a Reliable Grid Connected Micro-Grid Considering Uncertainty and Interruptible Loads

Hassanzadehfard, H.; Moghaddas-Tafreshi, S. M.; Hakimi, S. M.
June 2011
International Review on Modelling & Simulations;Jun2011, Vol. 4 Issue 3, p1216
Academic Journal
Uncertainty analysis is an important part of any assessment of the long-term energy production of a wind power, PV power and also loads demand. In the micro-grid at any moment balance must be maintained between electricity consumption and generation. Considering uncertainty causes micro-grid reliability to increase. In this paper a new methodology is proposed to perform the optimal sizing of grid connected micro-grid that consists of interruptible and uninterruptible loads. When total produced power in micro-grid plus purchased power from grid can't satisfy demand, first interruptible and then uninterruptible loads are interrupted. In this paper Forced Outage Rate (FOR) of each component and some notions of reliability are considered for micro-grid, and the effect of reliability and FOR on total cost of micro-grid is evaluated. In this paper, the problem is formulated as a nonlinear integer minimization problem which minimizes the sum of the total capital, operational and maintenance and replacement costs of DERs, penalty for interrupted loads, subject to constraints such as energy limits of each DER, limits of exchanged power, interruptible and uninterruptible loads. This paper proposes Particle Swarm Optimization (PSO) for solving this minimization problem. The proposed methodology was used to design micro-grid for northwest of Iran. The simulation studies have shown that the proposed methodology provides excellent convergence and feasible optimum solution for sizing of grid connected micro-grids using particle swarm optimization.


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