How Inertia Reduction Affects Synchronous Generators: The Case of Synchronizing Torque

The development of low CO2 equivalent emissions energy sources, like distributed generation, tends to reduce the global inertia of power systems by default. This phenomenon impacts grids' stability and the main synchronous generators. In this paper, a methodology is proposed to evaluate the evolution of the synchronizing torque coefficient under the effect of this inertia reduction. The results, detailed for each machine of the IEEE 10- generator 39-bus power system, show a linear trend as a function of system inertia. The methodology to model inertia reduction as well as considering other parameters than synchronizing torque are discussed in the paper.