关键词: 水风光多能互补；龙头水电站；梯级水电站；多目标优化；长期优化调度；流域水位区间控制；澜沧江水电基地

Abstract: Extending and utilizing the long-period and large-scale regulation capacity of hydropower is crucial for enhancing the level of grid seasonal supply guarantee and wind-solar consumption. The core challenge lies in defining the control range of water levels at key time nodes of leading hydropower stations on a long-term scale. In this paper, a scenario set of runoff-wind-solar power generation capacity combinations considering spatio-temporal correlation is taken as input, and a long-term multi-objective stochastic optimal scheduling model for cascade hydropower stations is constructed to guarantee grid power supply and wind-solar consumption. Taking the Lancang River hydropower base in Yunnan Province as an application example, the water level control intervals of Xiaowan and Nuozhadu two backbone hydropower stations that fulfil the demand of grid supply and consumption regulation are effectively defined. The variation patterns of these hydropower stations are analyzed under different runoff and wind-solar proportions. The results demonstrate that the validity of the water level control intervals exceeds 95%, which can support the grid developing a long-term water level operation plan for the leading hydropower stations. Additionally, as the proportion of new energy increases, the flexibility regulation capacity of hydropower for new energy is continuously weakened.

Key words: hydro-wind-solar multi-energy complementary; leading hydropower station; cascade hydropower stations; multi-objectives optimization; long-term optimization scheduling; river basin water level interval control; Lancang River hydropower base