MULTIOBJECTIVE ANALYSTS OF SERVICE-WATER-TRANSMISSION SYSTEMS

A multiobjective analysis technique is presented to determine the opti mum operation of pumps and reservoirs in service-water-transmission sy stems. Three major objectives were identified as (1) economics in term s of energy cost minimization; (2) stability in pump operation; and (3 ) reliability in meeting stochastically varying demands, These objecti ves were evaluated based on the required number of times the pumps wer e turned on or off, the required total energy cost, and the minimum re quired storage during the operating horizon. A set of nondominated sol utions to show the explicit trade-off relationships between the consid ered objectives was generated using a combination of the epsilon-const raint method and the weighting method. A forward dynamic programming a lgorithm was applied to find the optimal solution to the discretized m ultiobjective problem. Decision makers can evaluate the developed trad e-off relationship to identify potential operational alternatives for more detailed evaluation. The methodology was illustrated by applicati on to the Kumi service-water-transmission system in the Republic of Ko rea.