|Research on multi-objective operation based on improved NSGA-Ⅱ for the lower Yellow River
|中文关键词: 水库调度 多目标决策 个体约束 群体约束 快速非劣排序遗传算法
|英文关键词: reservoir operation multi-objective decision individual constraints group constraints NSGA-Ⅱ
| The relationship of beneficial goals, flood control and ecological goals is neither fully coordinating nor completely opposite, which is the physical basis of multi-objective coordination of reservoir operation. In this paper, an integrated operation model considering ecological and beneficial goals is constructed based on the contradiction and unity between different objectives of reservoir operation. In addition,an improved Non-dominated Sorting Genetic Algorithm-Ⅱmethod with Individual Constraints and Group Constraints (ICGC-NSGA-Ⅱ)is proposed to solve the model. By taking the cascade reservoirs,Xiaolangdi and Xixiayuan reservoir in the lower Yellow River as case study, a multi-objective operation model solved by ICGC-NSGA-Ⅱ method is built, which is designed to explore the relationship of the water supply, power generation and ecological benefits. The results show that the ICGC-NSGA-Ⅱ method can obtain a set of dispatching schemes which reflects the non-dominated relationships among the multi-objectives in a relatively short time. Moreover, it is found that the asymmetric trade-offs between the benefits of ecology, water supply and power generation really exists. In general, with the increase of power generation, the guarantee rate of ecological and comprehensive water supply decreases. The power generation competes with ecological water shortage stronger than with comprehensive water shortage. The study can provide technical support and reference value to multi-objective operation in of the lower Yellow River in the future.