Abstract
Reservoirs play a significant role in water resources management and water resource allocation. Traditional flood limited water level (FLWL) of reservoirs is set as a fixed value which over-considers the reservoir flood control and limits the benefits of reservoirs to a certain extent. However, the dynamic control of the reservoir FLWL is an effective solution. It is a method to temporarily increase the water level of the reservoir during the flood season by using forecast information and discharge capacity, and it can both consider flood control and power generation during the flood season. Therefore, this paper focuses on multi-objective optimal scheduling of dynamic control of FLWL for cascade reservoirs based on multi-objective evolutionary algorithm to get the trade-off between flood control and power generation. A multi-objective optimal scheduling model of dynamic control of FLWL for cascade reservoirs which contains a new dynamic control method is developed, and the proposed model consists of an initialization module, a dynamic control programming module and an optimal scheduling module. In order to verify the effectiveness of the model, a cascade reservoir consisting of seven reservoirs in the Hanjiang Basin of China were selected as a case study. Twenty-four-hour runoff data series for three typical hydrological years were used in this model. At the same time, two extreme schemes were chosen for comparison from optimized scheduling schemes. The comparison result showed that the power generation can be increased by 9.17 × 108 kW·h (6.39%) at most, compared to the original design scheduling scheme, while the extreme risk rate also increased from 0.1% to 0.268%. In summary, experimental results show that the multi-objective optimal scheduling model established in this study can provide decision makers with a set of alternative feasible optimized scheduling schemes by considering the two objectives of maximizing power generation and minimizing extreme risk rate.
Highlights
Water resources are one of the most indispensable resources in human life
After thefirst determination the model, dynamicthe control bound, this module to find out a series initialization module is used to determine the dynamic control bound of reservoirs which is operated of optimal combinations of the upper limit of flood limited water level (FLWL) in the cascade reservoir that can make a good in FLWL between dynamic control mode based on of thehydropower inflow forecast information
The objectives of this model are of inflow forecasting, the inflow forecasting error and the safety discharge of the downstream flood expressed in detail as follows: protection site, and original design FLWL is used as the lower limit of dynamic control bound, i.e., (1) Maximizing the joint power generation of the cascade reservoirs: Vu T= V d L+
Summary
Water resources are one of the most indispensable resources in human life. Excess water resources will lead to flood disasters, while shortages in water resources will lead to drought disasters [1,2]. The results indicate that the FLWL dynamic control mode of the reservoir can increase power generation and the water resource utilization rate without increasing the risk of flood control. The results indicate that the model with an objective of maximize power generation can improve the benefits of the Qingjiang cascade reservoirs without reducing the flood control standard. A multi-objective optimal scheduling model of DC-FLWL for cascade reservoirs which contains a new dynamic control method has been developed to obtain a set of alternative and feasible optimized scheduling schemes by considering the two objectives of maximizing power generation and minimizing extreme risk rate. (1) A multi-objective optimal scheduling model of DC-FLWL for cascade reservoirs with two objectives is formulated, which contains maximizing power generation objective and minimizing extreme risk rate objective.
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