Modular Hydro Dam Approach to the Economic Development of Ultra Low-Head Hydropower

摘要

The solution to developing economical ultra low-head (10 ft. -6 ft., 3m-2m hydrpower lies in being able to reduce equipment and construction costs at new dams to less than $4000/KW, while maintaining an operating efficiency of 80% or more. The purpose of this investigation was to explore the potential for developing economical new ultra low-head sites using an innovative concept known as the Modular Hydro Dam (MHD). This concept, combines the benefits of shop fabrication and installation of equipment in truck transportable, waterproof power modules, with prefabricated gate sections that can be located between the power modules. Lateral support to withstand the static head pressure is provided by an upstream tension cable system anchored at each bank. Foundation design for vertical support varies with subsurface conditions. The technical, economic, environmental, and institutional feasibility of the MHD concept were examined. The module selected contains an axial-flow type turbine, rated at 300 kW under a 10-ft head, a generator driven by a belt drive, vertical intake gate, and electrical control system and switchgear. Capital and operating costs are estimated. It is concluded that the US potential for power generation at ultralow-head sites justifies the development of the MHD concept, and that a full scale demonstration of the concept could be completed by 1986. (ERA citation 06:030114)