Research On Compensative Operation Of Two-reservoirs And Multi-cascaded Hydropower Plants

Recently, a number of two-reservoirs and multi-cascaded hydropower plants have been developed in Southwest China, But as a result of the high cost of controlling reservoir, hydropower plants with good regulation is short and deserted water is plenty in flood season. It is important to do research on compensation benefits calculation and allocation of two-reservoirs and multi-cascaded hydropower plants, to ensure the income of investors and optimize the structure of hydropower.In this paper, the "two-reservoirs and five-cascaded hydropower plants" on Lancang River was used as case study. Deterministic optimal operation models are utilized to calculate the compensation benefits of three situations:cascaded hydropower plants belonging to multiple agents at planning stage and operation stage, and belonging to one agent at planning stage. And compensation benefits allocation of two-reservoirs and multi-cascaded hydropower plants is studied. The main wok in this paper is as follows:(1) To calculate the compensation benefits of two-reservoirs and multi-cascaded hydropower plants belonging to multiple agents at planning stage, a power generation maximum and the minimum output maximum model of single station is established, and the compensation rule of power and electricity is revealed. The case study show that controlling reservoirs can improve the minimum output and power generation of hydropower plants downstream, reduce deserted water, and improve output in dry season, compensation benefits are significant.(2) To calculate the compensation benefits of two-reservoirs and multi-cascaded hydropower plants belonging to multiple agents at operation stage, a single reservoir optimal dispatching model and an optimal combined dispatching model are established, and the compensation rule of power and electricity is revealed. The case study show that the leading reservoir has a power compensation for plants downstream, and improve the total output in dry season, improve the power generation and reduce deserted water. For plants downstream, the compensation benefit at planning stage is more significant than that at operation stage.(3) To calculate the compensation benefits of two-reservoirs and multi-cascaded hydropower plants belonging to single agents at planning stage, influence of multiple controlling reservoirs made on cascaded hydropower plants and joint operation made on controlling reservoirs are studied. The single reservoir optimal dispatching model and the optimal combined dispatching model are utilized, and the compensation rule of power and electricity is revealed. The case study show that controlling reservoirs can improve the minimum output and power generation of hydropower plants downstream, reduce deserted water, and improve output in dry season. But the generation benefit of the leading reservoir is reduced.(4) To allocate the compensation benefits of two-reservoirs and multi-cascaded hydropower plants, a compensation benefits allocation method of two-reservoirs and multi-cascaded hydropower plants belonging to multiple agents based on coalition games is proposed. Firstly, calculate power generation benefit of each plant for all possible combination of plants having been put into operation, then allocate the compensation benefits with Nash-Harsanyi bargaining solution, Shapley value, Nucleolus and ? value. Finally, the stability of the allocation solutions is evaluated using the core of the coalition games, plurality rule and propensity to disrupt. The results show that the proposed method can allocate the compensation benefits of two-reservoirs and multi-cascaded hydropower plants reasonably and eliminate the influence of different allocation sequence effectively.Finally, the content of the whole paper is summarized and suggestions of further study are given.