In allusion to the uncertainty of photovoltaic power output

robust optimization method is adopted to study the capacity limit of grid-connected photovoltaic power station. An optimization model of capacity limit of photovoltaic power station under constraint conditions is built by using cassette robust optimization method. In the model

the solar radiation intensity which is uncertain parameter is used for describing the uncertainty of photovoltaic power output

and is transformed to linear programming problems by optimized duality theory. Case study on a 46-bus system is conducted to verify the model

which indicates that the proposed model is practical and effective. The test results show that the different grid-connected node

and fluctuation region have greatly influence on the capacity limit of grid-connected photovoltaic power station.