基于峰谷电价和年费用法进行输水方案的比选

选择合理的输水方案是降低输水工程费用的重要途径，合适的比较方法则是优选方案的前提。该文提出了基于峰谷电价的年费用法作为输水方案的比较方法。在满足输水水量、水压和可靠性的要求下提出不同的输水方案，考虑资金的时间价值、管网的动力费用、峰谷电价、折旧大修费用等因素，计算不同输水方案的最小年费用值，比较其大小，以此作为输水方案的优选依据。

Selection of water delivery schedule based on peak-valley electricity price and annual cost usage

The rational water delivery schedule is an important way to reduce water engineering cost, and the appropriate comparative method is the premise of optimization schedule. Currently, water delivery schedule selection is mainly based on the initial investment cost comparison. It is simple, but did not consider the value of the power cost of pipe network, peak-valley electricity price and the other factors. With the rise of electricity prices, power cost is a growing proportion in the total costs. As peak-valley electricity price carrying out, transmitting water in the time of the lower electrovalency can reduce power cost, but water pipeline and storage structure put forward new requirements. The cost for the filling and emptying system optimization will be between capital cost and power cost optimization. Therefore, this paper presents the annual cost method based on peak-valley electricity price as a new method of comparison, considering the initial capital investment costs, the power cost during the network operation, depreciation and overhaul costs and the other factors. This paper presents three water delivery schedules: 1) transmitting water uniformly in 24 hours by two parallel pipes; 2) transmitting water uniformly in 24 hours by one pipe with a reservoir in the end; 3) transmitting water uniformly in the time of lower electrovalency by one pipe with a reservoir in the end. Using the minimum annual cost of the water delivery as the objective function, and the reliability of water delivery system as the constraint condition, we find out the minimum annual cost of the three water delivery schedules. The results of power costs have a large proportion in annual cost, the price of electricity has an important effect on the water transmission selection. As peak-valley electricity price carrying out, rational water transmitting in time of lower electrovalency can reduce power cost.