Optimization of hydropower reservoir systems based on profust reliability

Abstract

Successful operation and management of reservoirs are inevitable for the newlinesustainability of water resources systems. This requires minimization of failures of any newlinekind or the risk associated with those failures. The failure of any system may be broadly newlineclassified as structural failure or functional failure. Considering a reservoir as the newlinesystem, functional failure, or in other words, the inability to perform the intended newlinefunction satisfactorily, is more critical from the water resources point of view. newlineFunctional failure or operational failure may be considered as the inability to meet the newlinespecified target in terms of drinking water supply, agricultural water, hydropower or newlineflood control depending upon the purpose of the reservoir. Reliability is an important newlineperformance measure by which the failure of a reservoir may be ascertained. newlineIn the case of hydropower reservoirs, reliability is measured in terms of energy newlineproduced and energy required. A hydropower reservoir is considered to be failed if the newlinerequired amount of power is not produced. The reservoir may be either working or newlinefailed at a particular time period depending on whether the demand is satisfied or not. newlineThe reservoir system may continue in its failed state or move to the working state newlinedepending on the inflow and demand. The existing studies consider the conventional newlinereliability or two-state reliability, i.e, whether the demand is satisfied or not. In newlineconventional reliability, a system for which 20% of the demand is satisfied and 70% of newlinethe demand is satisfied are treated as same as the target demand is not attained in both newlinecases. A greater proportion of the demand may be actually satisfied in most of the cases newlinewhere the system is considered to be failed. The existence of multiple states between newlinethe fully working and fully failed states of a reservoir needs to be investigated to newlineimprove the operating policy. newline