Research on capacity computation of cascade on-stream integral pumped storage hydropower plants Ⅱ:multi-scale nesting model for capacity computation and specific example
Energy storage power stations typified by pumped storage hydropower(PSH)station building upon hydro-power base plays pivotal role in improving peak shaving capacity of power system and promoting the wind power and photovoltaic power accommodation capacity.This study proposes a multi-scale nesting model for capacity planning which coupling short-term peak shaving model of PSH station and cascade hydropower stations,and long-term op-eration model of cascade hydropower stations for multipurpose use.Moreover,given the high dimensionality of the multi-scale nesting model,we propose a method based on the surrogate model.The planned cascade PSH stations in the Yellow River Basin are selected as case study.We suggest three development modes of PSH stations,i.e.in-dividual development mode,cascade developmnent mode and integrated development mode.Sequentially,this study recommends the installed capacity under the three development modes and computes the peak shaying benefits through pumping operation.Furthermore,we derive the theoretical formula describing the impact of pumping time and transform efficiency between power generation and consumption on the installed capacity of PSH station.Relat-ed results are shown as follows:we suggest adopting the combination of pump units and reversible units or pump u-nits and enlargement of Longyangxia hydropower plant to develop Longyangxia-Laxiwa PSH station.Under individ-ual development mode,the capacity of Longyangxia-Laxiwa PSH station is suggested 160 × 104 kW.In comparison,while it is developed together with Laxiwa-Nina PSH station,the Longyangxia-Laxiwa PSH station is suggested 205×104 kW.The installed capacity of PSH station can increase with the reduction of designed pumping time.In this context,the peak shaving ability of PSH station increase,however,the peak shaving benefit by pumping remains unchanged.The installed capacity of Laxiwa-Nina,Lijiaxia-Zhiganglaka,Gongboxia-Suzhi plant are suggested 75×104 kW,16×104 kW,59×104 kW respectively.These developed plants can increase con-sumption of new energy 87.42×108 kWh per year.
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