Abstract
Ecological operation of cascade hydropower stations is one of the most important methods for the ecological restoration of a river system. In order to balance the benefits between power generation and ecology of Qingjiang cascade hydropower station, an optimal equilibrium operation method is proposed in this paper. Firstly, the range of ecological flow of the Qingjiang cascade is calculated by using ten-day frequency calculation method. Secondly, an optimal equilibrium operation model by considering the balance between power generation and ecology is established. And then, in order to solve this complex model, a particle swarm optimization based model solution method is proposed, and the evaluation index system of operation schemes is established. Finally, through operation calculation in 2008-2010 years, the results show that compared with the operation scheme considering only power generation benefit, the optimal equilibrium operation scheme increases the runoff ecological dispersion coefficient by 6.90%，reduces the cascade ecological overflow by 7.739 billion m3and the cascade ecological water shortage by 130 million m3, while the cascade power generation decreases slightly by 1.83%. This study provides an effective scientific method for the optimal operation of Qingjiang cascade under the background of Yangtze River protection.
Highlights
In 2018, at the Second Forum on the Development of the Yangtze River Economic Zone held in Wuhan, Comrade Xi Jinping pointed out: "Correctly grasp the relationship between overall promotion and key breakthroughs, and comprehensively do a good job in the protection and restoration of the Yangtze River ecological environment
The runoff ecological deviation coefficient is added into the target function of the maximum annual power generation, so as to establish the optimal equilibrium operation model between power generation and ecology of Qingjiang cascade hydropower station n max E2 = γ i ⋅ Pti ⋅Δt
Particle swarm optimization (PSO) algorithm is used generation and ecology, the increased waste water greatly to calculate the optimal dispatching model with the improves the ecological environment of Qingjiang objective of maximizing the cascade generation capacity cascade discharge, and the cascade ecological deviation and the objective of optimal equilibrium coefficient of runoff is increased by 6. 90%, the cascade operation between power generation and ecology
Summary
In 2018, at the Second Forum on the Development of the Yangtze River Economic Zone held in Wuhan, Comrade Xi Jinping pointed out: "Correctly grasp the relationship between overall promotion and key breakthroughs, and comprehensively do a good job in the protection and restoration of the Yangtze River ecological environment. As the second largest tributary of the middle reaches of Yangtze River below the Three Gorges, the Qingjiang River Basin is 423 km long and consists of Shuibuya, Geheyan and Gaobazhou three large-scale hydropower stations. Established a multi-objective ecological optimal dispatching model for the Three Gorges cascade hydropower station, aiming at maximizing the generation capacity and minimizing the ecological water shortage. The eco-friendly multi-objective optimal dispatching model of the Three Gorges cascade hydropower station was constructed by Wang et al [3] in 2013. In 2017, Dai et al [4] introduced the non-dominated sequencing genetic algorithm with elite retention strategy to solve the reservoir optimal operation model with the objective of maximizing the generating capacity of the Three Gorges hydropower station and minimizing the change of the optimal ecological flow in the downstream river. Notes: Ri is inflow of the ith reservoir; qi is the water release of the ith reservoir; Ii is the stream flow of intermediate catchment between the i-1threservoir and the ith reservoir
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