Transmission Capability of the Grid Cross Section Considering the Interruptible Load Management

Abstract

This paper proposes a mathematical model of power grid section transmission limit under the constraints of N-1 contingency analysis and interruptible load management. By loosen the conditions of traditional N-1 analysis with the interruptible load management on demand side, an improved power grid section transmission limit model considering the interruptible load and power flow constraints is established. The opposite-quantities-adjusted in pairs method based on branch sensitivity is studied and proposed to solve the model. The quantitative relationship between the increments of the grid section transmission limit and the load interrupted quantities is tested with the IEEE39–bus testing system. The simulation result shows that the application of interruptible load can improve the grid section transmission limit, as well as improving the operation economy while the security of the power system is guaranteed.