Abstract：Since wind power is explored on a large scale and in a highly centralized way these years, and usually wind bases are inconsistent with load in geographic region, so transmitting wind power through high-voltage transmission line will be an inevitable trend. In this new situation, the paper presents an optimal methodology for corollary thermal sources transmitted with wind power together for wind power’s variability and low energy density. For the random nature of wind power, the duration curve of spare capacity of transmission line (STC) which can be used to transmit thermal power is introduced to illustrate characteristics of capacity for thermal power after transmitting wind power. Based on the duration curve of STC, the model for optimizing the capacity of corollary thermal sources is proposed, which takes into account transmission line costs, thermal sources costs and benefit of electric power transmitted, and the objective function being maximized is the total benefits. The model can be solved by a two-stage optimal strategy. The case studies are carried out for a system, where effects of coal price and electricity price on the optimal schemes is also studied, and the results verify the effectiveness of the presented method.
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2012, Vol. 27 
