Zonal do-not-exceed limits with robust corrective topology control

The penetration of renewable resources in electrical power systems has increased over the years. This increased levels of intermittent resources adds complexities in power system operations. At the Independent System Operator of New England (ISONE), in real-time operation, the renewable resources are integrated into the system using do-not-exceed (DNE) limits. The determination of DNE limits, in real-time, is challenging; to reduce the computational time, approximations are made and mathematical models are simplified. In this paper, a zonal approach is proposed to determine DNE limits, which reduces the network model into few interlinked zones. The approximations with the zonal approach do not affect the quality of solution to a great extent. However, they reduce the computational time so that the zonal DNE limits approach may be implemented in real-time. The DNE limits determined with the zonal approach are compared with the detail nodal DNE limits on a smaller IEEE-118 bus test case and a realistic system provided by Tennessee Valley Authority (TVA).