Joint Operation of Large Scale Hydropower System Based on Minimum Operating Water Level Optimisation

基於最低運行水位優化控制的梯級水庫聯合調度

李基棟(LI JI DONG)

《台灣水利》 67卷3期 (2019/09) Pp. 24-38

摘要

Reservoir water level control under joint operation is important when maximising the potential utilisation of cascade reservoirs. The minimum operating water level (MOWL) and optimal impoundment starting time (OIST) of each reservoir are two key issues for cascade reservoirs under joint operation. This work focuses on the MOWL, OIST, and joint operation water level control strategies for cascade reservoirs. A two-stage-optimisation method was designed and applied to analyse the two key issues. The Yalong River lower reach cascade reservoirs were taken as case studies. Based on the MOWL and OIST rules for each reservoir, some visual and practical optimal cascade reservoir control strategies under different runoff frequencies were obtained. Application results indicated that compared with the designed operation rules, the strategies could generate an extra 0.695 billion kWh for an increase of 0.96% annually, and could significantly increase the annual average output during dry season by 0.323 GW (6.24%). Moreover, several water level control rules for the joint operation of cascade reservoirs are proposed and could provide an important reference when deriving future cascade hydropower station system operating schemes.

關鍵字

Cascade reservoirs ； Water level control ； Minimum operation water level (MOWL) ； Optimal impoundment starting time (OIST) ； Hydropower generation

並列摘要

梯級水庫聯合運行的水庫水位控制是充分發揮其調節潛力的重要措施，其中梯級各站的最低運行水位與優化蓄水時機的確定是實現聯合優化運行的關鍵問題。本文針對最低運行水位與優化蓄水時機這兩個關鍵問題，設計並應用了一種二重優化計算方法，以雅礱江下游梯級水庫為例，分析得到了各站年度最低運行水位與優化蓄水時機規律，並基於此規律得到不同來水頻率下梯級水電站的優化控制方案，方案的應用效果表明與傳統調度方式相比不僅可以提高梯級電站多年平均發電量（6.95億kWh，0.96%），更能明顯提高枯水期平均出力（323 kW，6.14%），優化了電力供應結構，方案具有簡單實用視覺化可操作等特點。不僅如此，本文通過計算分析總結得出了水庫水位控制的經驗規律，可為梯級水庫的聯合優化調度運行提供參考。

並列關鍵字

梯級水庫 ； 水位控制 ； 最低運行水位 ； 優化蓄水時機 ； 水力發電