抄録
Urban district heating and cooling (DHC) systems operate large freezers,
heat exchangers, and boilers to supply hot and cold water, steam etc. stably and
economically, based on customers demand. We formulate an operation-planning problem
as a nonlinear integer programming problem for an actual DHC plant. To reflect
actual decision making appropriately, we incorporate contract-violation penalties into
the running cost consisting of fuel and arrangements expenses. Since a yearly operation
plan is necessary for checking whether the minimum gas consumption contract
is fulfilled or not, we need to solve long-term operation-planning problems. To solve
long-term operation-planning problems fast and approximately , we propose a decomposition
approach using coarse (monthly) approximate operation-planning problems.
