Author(s): Yuan Si, Xiang Li, Dongqin Yin, Jiahua Wei, Yuefei Huang, Tiejian Li, Guangqian Wang
Linked Author(s): Yuan Si
Keywords: Hydropower operation, multi-objective optimization, nonlinear programming, upper yellow river, Qinghai Power Grid.
Abstract: The reservoir system in the Upper Yellow River, one of the largest hydropower bases in China, plays a vital role in the energy structure of the Qinghai Power Grid. This paper aims at studying the trade-off between power quantity (i. e. , maximum power) and power reliability (i. e. , firm output) of the reservoir system in case of joint operation. A total of 13 reservoirs currently in operation are involved, including two pivotal storage reservoirs on the Yellow River, which are the Longyangxia reservoir and the Liujiaxia reservoir. The multi-objective model is formulated, and with the epsilon constraint method, it can be solved by a traditional nonlinear programming algorithm. Historical hydrological data from multiple years (2000-2010) are used as inputs to the model for analysis. Results indicate that if the reservoir system is operated jointly, the firm output can reach 3110 MW (guarantee rate of 100%) and 3510 MW (guarantee rate of 90%); while the maximum power can reach 297. 7, 363. 9, and 411. 4�108 KWh in typical dry, normal, and wet years, respectively. Moreover, a decrease in power generation from the Longyangxia reservoir can bring about a very large increase in firm output from the reservoir system. Furthermore, the trade-off curve between the two objectives is also provided for reference
Year: 2017