A Novel Unit Commitment Method Considering Power System Reliability

A new method is proposed for the incorporation of the system reliability and economy in the solution of the short-term unit commitment problem. The cost of spinning reserve is included in the total operating cost. To minimize the total cost with an acceptable reliability level, both fuel consumption and unavailability of the generating units have been taken into consideration. The augmented Lagrangian method and the Broyden-Fletcher-Goldfarb-Shanno algorithm are used to solve the dynamic economic dispatch subproblem. The evaluation of the required reserve capacity is performed by implementing reliability constraints, based on the loss of load probability index. Numerical results on the 26 generating units test system have proven the efficiency of the proposed method.