engleski

Analysis of SHPP Brodarci influence on production of HPP Ozalj

Hydro junction Brodarci on the river Kupa is part of flood protection system Srednje Posavlje focusing to protect the city of Karlovac. Final design of flood protection system includes utilisation of hydropower in form of small hydropower plant Brodarci (SHPP Brodarci). In this paper an analysis of the impact of the SHPP Brodarci backwater on the production of existing hydropower plant Ozalj (HPP Ozalj) is given. Within the analysed river reach is located confluence of tributary river Dobra. HPP Lešće operation on river Dobra affects the regime of the river Kupa between the SHPP Brodarci and HPP Ozalj. Available hydrologic data includes information from gauging stations on river Kupa upstream and downstream of analysed river reach and on river Dobra downstream of HPP Lešće. Assessment of HPP Ozalj’s tailwater in the design state is based on the results of a detailed hydraulic flow model setup on hourly data and operating conditions on both HPP. Also are available hourly data for the year 2012 on production, the tailwater and the headwater at HPP Ozalj. For better description of the real conditions of production and thus a more accurate assessment of the impact efficiency curve for HPP Ozalj is analysed in detail. The main idea was to determine efficiency coefficient depending on available flow and head. Conducted analyses resulted in comparison of HPP Ozalj’s production in the current and design state based on the defined hydrological regime and efficiency curve. Results show that the raising tailwater during low flow has no negative effect on the production of HPP Ozalj due to improved working conditions and increased efficiency coefficient.

small hydropower plant ; efficiency curve ; backwater impact

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