Contribution of Power Converters in Frequency Stability of Low-inertia Power Systems
Résumé
Integration of low carbon electricity generation technologies such as Renewable Energy Sources (RES) has been increasingly considered as a potential way to decrease Green House Gases (GHG) emissions from conventional fossil fuel power plants. With such increased penetration of such RES specially those interfaced with the network through power electronic converters (RES-CI), new challenges emerge in the way the resulting future power systems are conceived and operated. In this manuscript, we discuss the challenge of low-inertia prevailing in such systems, we touch down upon the roots of the problem, and assess a potential solution by considering the possibility of converters contributing to the grid's operation, stability and robustness. A small signal dynamic model of a converter outer control emulating inertial response is utilized to prove the concept. Results show decreased ROCOF and increased nadir values. Additional conclusions related to tuning, control and stability analysis were also drawn from the results. Finally some future research directions to proceed in this domain are proposed.
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