Abstract: In order to ensure the reliable operation of power system， the unit commitment should take into account the risk brought by uncertain factors in power grid. Large-scale wind power integration into the power grid brings more uncertainty to the operation of the power system. Power grid interconnection can weaken the impact of wind power uncertainty on power grid operation to some extent， but at the same time it increases the complexity of unit commitment problem. In order to obtain a practical and feasible unit commitment scheme in a limited computing time， it is necessary to screen typical scenarios to measure the operation risk of the power grid. On the basis of wind power and load forecasting errors， a set of forced outage scenarios of units and tie lines in interconnected power grid is set up， and the risk quantification indexes of expected wind power curtailed （EWPC） and expected energy not supplied （EENS） of interconnected power grid are constructed， which are introduced into the objective function in the form of punishment. A model considering the multi-scenario running risks of safety constraint unit commitment of multi-area power grid is established. The correctness and validity of the commitment strategy is verified by the two-region 12-node system.

Key words: interconnected power grid, unit commitment, reserve capacity, expected energy not supplied（EENS）, expected wind power curtailed（EWPC）