THE OPTIMIZATION OF OPERATIONAL PATTERNS FOR CIPANUNJANG-CILEUNCA CASCADE RESERVOIR USING CONTINUOUS MODELS

Abstract

Cipanunjang-Cileunca Cascade Reservoir is the source of raw water for the drinking water supply system for the City and Regency of Bandung, West Java Province. Plengan, Lamajan, and Cikalong are three hydroelectric power plants (PLTAs) in the reservoir. The issue that is frequently faced in reservoir is that excess water is lost to the spillway during the rainy season but the water supply decreases in the dry season, disrupting the PLTA’s performance. This study was aimed to optimize the operation pattern of the reservoir so that these needs can be fulfilled. The optimization of the reservoir can be achieved if the conditions of the guidelines trajectory and the actual trajectory are close to 1, meaning that no water passes through the spillway but instead moves through the reservoir utility function. In this study, the simulation results of the operation pattern of reservoir using continuous-model-obtained correlation values between guidelines trajectory and actual trajectory for a three-class and five-class operation pattern of the Cipanunjang Reservoir were 0.8 and 0.82, respectively. Meanwhile, the correlation values between guidelines trajectory and actual trajectory for three-class and five-class operation patterns of the Cileunca Reservoir were both 0.95.  The results of this study show that the five-class operation pattern (very dry, dry, normal, wet, very wet) is better than the three-class operation pattern (dry, normal, wet) in the simulation of the operation pattern, so it is more suitable for use in facing uncertainty in the future.