Spinning Reserve Optimization Under Multiple Time Resolution Unit Commitment Module

Spinning reserve is the unused capacity of synchronized units and it is used to address the unforeseen events during power system operations. This paper proposes a spinning reserve optimization method under the multiple time resolution unified unit commitment and economic dispatch model. Finer time resolution and detailed modeling will be used during the first few hours of the scheduling cycle, while coarser time resolution and simplified modeling will be used during the remaining hours. The spinning reserve is determined by minimizing the running cost, start-up cost, shut-down cost, reserve cost and the expected interruption cost. In order to overcome the computation intractability introduced by EENS, EENS is formulated as linear function of the system spinning reserve. It is found that the multiple time resolution model is fit for determining multiple type of reserves rather than single type of reserve. The efficiency and validity of the proposed method is verified using the IEEE-RTS system.