A computer program for the steady-state optimisation of the operation of a gas transmission system is described. The program solves the nonlinear optimisation problem iteratively, linearising the gas-flow equations to give a linear constrained problem; optimising by mixed-integer linear programming; and re-linearising about the optimum; until convergence is obtained. Costs may include compressor fuel, flows from sources, or any chosen control variables. Examples of applications are given . Some other published methods are briefly described.
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