关键词: 水库调度, 以电定水, 蓄能最大, 耗能最小, 能效系数, 一致性模型, 梯级水库

Abstract: Maximum energy storage and minimum energy consumption of cascade reservoirs are two optimization criteria commonly used in the “regulating impoundment by power generation” mode，which have the same objective of maximizing the benefits of power generation from two different angles. The traditional mode does not consider the effect of hydropower stations’ efficiency and cannot truly reflect the operation goals. Besides, the two criteria use the average value in a time interval to calculate, which causes divergence. In view of the above problems, this paper introduces energy efficiency coefficient to reflect a hydropower station's capacity of utilizing hydropower resources, and improves the traditional criteria. By verifying the consistency of the improved criteria, a consistency model of energy storage and consumption in load distribution is built and applied to Pankou-Xiaoxuan cascade reservoirs. Results show that the improved maximum energy storage and minimum energy consumption criterion are completely consistent and can better reflect the operation goals of cascade reservoirs. Thus, the proposed model produces a greater optimization margin than the traditional one and can provide more effective guidance for optimal operation of cascade reservoirs in the “regulating impoundment by power generation” mode.

Key words: reservoir operation, “regulating impoundment by power generation” mode, maximum energy storage；minimum energy consumption；energy efficiency coefficient；consistency model, cascade reservoir