APPLICATION OF A MILP MODEL TO A LARGE-SCALE WATER DISTRIBUTION SYSTEM WITH THE OBJECTIVE OF REDUCING ELECTRIC POWER USAGE

Abstract

 Energy saving is one of the issues to be taken up in providing water services. An investigation of electric power usage in water service shows that more than 60% of that use is in the water distribution process. An important research theme for reducing electric power usage is therefore optimization of water operation, that is, devising plans that achieve the most rational distribution of water from filtration plants and through service reservoirs.
 This paper 1) proposes a model optimized to the purpose of reducing electric power usage in a water distribution system, and 2) describes a simulation of a large and complex water distribution system in the Bureau of Waterworks, Tokyo Metropolitan Government. The model was developed to be as faithful as possible to the realities of the target system, which consists of 11 filtration plants, 29 water supply plants, and 56 distribution areas, including by setting constraints such as using observed values for fluctuations in stored water amounts in service reservoirs. Based on the simulations using the proposed MILP model, the study shows the extent of electric power usage reduction to be expected from the optimization.