PROJECT TITLE :

Effects of Front-end Converter and DC-link of a Utility-scale PV Energy System on Dynamic Stability of a Power System - 2017

ABSTRACT:

This paper presents a methodology for little-signal dynamic studies of power systems including utility-scale PV energy systems considering the results of dc-side components. Existing methods commonly model a PV energy system as a dc source connected to a grid-tied inverter. This paper shows that the dc components of a PV energy system can additionally contribute within the dynamics of the power system in the vary of tiny-signal studies. The paper first develops the model of a PV energy system by merging the submodels of dc-and ac-aspect components. Then, a technique to get the augmented model of the power system together with a PV energy system can be explained using a study system. The study system consists of a PV energy system in parallel with a synchronous generator connected to a grid. Then, primarily based on eigenvalue analysis, verified by time-domain simulations, it is shown that the dc-link capacitor, front-finish converter, and its controller can introduce oscillatory modes in subsynchronous vary of frequencies. Furthermore, it's shown that the damping of the sensitive modes can significantly vary with respect to the parameters of the dc-facet elements.


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