An optimisation approach for the operating rule curves of the A Vuong reservoir, Vietnam

This paper proposes to optimise the operation of the A Vuong reservoir using the dynamic programming technique. The A Vuong is a large reservoir in Vietnam serving multiple purposes, including power generation, flood control, and downstream water supply. First, different flood control storage capacities (Vpl) are investigated, and the best one is chosen based on the criteria of power output and the reservoir's ability to fill up after each regulation cycle. That option is for Vpl to be 50, 30, and 10% of the active storage capacity in September, October, and November, respectively. The study also proposes new operating rule curves with various scenarios of different beginning water levels, ranging from 368 m to 380 m. The average lines of the operating rule curves are also suggested for easier and more efficient operation. Recommendations for using this operating rule curve, as well as its advantages compared to the current one, are also discussed. The results show that the proposed operating rule curves provide much better performance compared with the current in terms of increasing the power output, with a 3.1% increase, while also protecting other water uses. HIGHLIGHTS The flood control storage capacity was proposed to ensure the objectives of flood control, power output, and water supply.; New operating rule curves with various beginning water levels.; The optimal operation rule curves can boost power output by 3.5% and 3.1% for the dry season and the whole year, respectively.