Normalized Kinetic Energy based Generation Reshuffling to Improve Dynamic Security Constrained Optimal Power Flow

Abstract

Conventional methods for economic load dispatch do not include dynamic security constraints into the optimization problem; therefore, an insecure generation dispatch may create a blackout scenario under a certain contingency. Such scenarios can be avoided by including dynamic constraints in the optimization problem in the form of voltage stability, small signal stability, transient stability, etc. Transient stability constrained optimal power flow (TSC-OPF) is proposed in this paper to compute dispatch for different generators economically. The proposed TSC-OPF reshuffle generation of machines by withdrawing dispatch from critical machines (threatening the system security) and economically distributing them among non-critical machines. This generation reshuffling is based on deviated normalized kinetic energy of individual machine from the mean value of normalized kinetic energy of all machines in the system at the instant of instability. The proposed method is tested and verified for different test systems such as IEEE 39 bus test system and IEEE 68 bus test system for different contingencies.