A Simulation-Optimization Model for Multireservoir Cascade Hydropower Systems Operations

Sequential streamflow routing (SSR) with control on reliability of meeting energy demand is a common methods for assessing energy potential in practical hydropower projects’ design and operation in Iran. This approach results in developing a reliability – based simulation (RBS) model which is used for design of single-reservoir hydropower projects . Considering the fact that the integrated analysis of the system may lead to design variables and system energy potential which could be different from those obtained by single – reservoir analysis, a multi – reservoir simulation – optimization model is proposed considering the integrated system operations. The core of the model developed is the same as what is used in a single – reservoir RBS model as a simple as a simple and well-know model professional applied hydropower practices .However to determine the reservoir releases in each time step of the simulation model, an iterative single-period linear programming (LP) model is used . The LP model minimize the sum of reservoir releases and/or maximizes the sum of reservoir storages. The application of the above-mentioned models is analyzed in the Khersan hydropower reservoir system located in Iran as the case study. For reliability of meeting energy demand equal to 90% results indicate that the multi-reservoir RBS model proposed increases the system firm energy by 7.9% compared the model which sequentially uses single – reservoir RBS models.

Keywords:

Hydropower , Cascade , Sequential streamflow routing , Simulation , Opetimization