The Decision Method Of Optimal Utilization Model For Photovoltaic Generation In The Station Space Of Rail Transit

With the expansion of city size, the construction of rail transit gradually becomes the first choice to ease traffic pressure for lots of cities. Compared to other mode of transportation, the rail transit is relatively energy saving. However, the power consumption is huge due to its large volume. Consequently, more attention has been paid to the energy consumption of rail transit. Instead of regular electric energy, photovoltaic(PV) generation is widely accepted to be used in rail transit station space for certain loads. Considering the utilization models of PV generation are various, the characters of different models may differ from each other. Meanwhile, the technology and economic benefit which is generated by same utilization model used in different sites of the station space remains far apart. In view of this, the optimal utilization model in the station space of rail transit is proposed in this paper. The main task of this article can be summarized as follows:Firstly, based on the research achievement of the PV generation and rail transit both at home and aboard, utilization models of PV generation and the condition of sites and loads in rail transit are systematically summarized in this paper. Besides, this paper proposed three utilization models of PV generation which are applied to station space in rail transit and certain loads which can use PV generation.Then, based on in-depth analysis energy exchange process of different PV utilization models,the optimal model was established about the utilization model for PV generation in the station space of rail transit. It could compare systematically for the integrated cost of three PV utilization models used in the station space which includes stand-alone PV system, counter current grid-connected PV system and anti-counter current PV system. The integrated cost refers to the aspects of initial investment, operating and maintaining cost, government subsidy, extra power purchase cost, and reverse electric selling profits etc. The method of hierarchical comparison was adopted in this model, known as extracted the optimal model in every scheme and then compared each other to select the lowest integrated cost plan as to be the final optimal model.Finally, the method of optimal PV model was applied in one real elevated metro station. The optimal PV model was analyzed in the given situation combined with specific conditions. The reasonability and correctness of the model was proved based on the result of the decision. And also the influence of the optimal model caused by the fluctuation of the load was analyzed. These analyses came to some useful conclusions which could be referenced in practical application.