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This work proposes a hybrid of stochastic programming§(SP) approaches for an optimal midterm refinery§planning that addresses three forms of uncertainties:§prices of crude oil and products, demands, and§yields. An SP technique that utilizes compensating§slack variables is employed to explicitly account for§constraint violations to increase model tractability.§Four approaches are considered to achieve solution§and model robustness: (1) the Markowitz's§mean-variance (MV) model to handle randomness in the§objective coefficients by minimizing the variance§(economic risk) of the expected value of the random§coefficients; (2) the two-stage SP with fixed§recourse to deal with randomness in the RHS and LHS§coefficients of the constraints by minimizing the§expected recourse costs; (3) incorporation of the MV§model within the framework in (2) to formulate a§mean?risk model that minimizes the expectation and§the operational risk measure of variance of the§recourse costs; and (4) reformulation of the model in§(3) by adopting mean-absolute deviation (MAD) as the§operational risk measure imposed by the recourse§costs for a novel refinery planning application. A§numerical example is illustrated.
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