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This paper proposes a novel technique for representing system security in the operations of decentralized electricity markets, with special emphasis on voltage stability. An Interior Point Method is used to solve the Optimal Power Flow problem with a multi-objective function for maximizing both social benefit and the distance to maximum loading conditions. A 6-bus system with both supply and demand-side bidding is used to illustrate the proposed technique for both elastic and inelastic demand,doi:10.1109/tpwrs.2003.810897 fatcat:hrdzka4wpnekfbophd332lbore