Understanding Resonance in a Renewable Energy Power Plant

Abstract

This paper investigates the effect of various causes of resonance found in a typical renewable energy power plant. The consequences of resonance are discussed, and a simplified single-phase equivalent model of a plant is mathematically described and modelled in MATLAB. Reactive element interaction that causes resonant frequencies is discussed. Results obtained from the simplified mathematical model are compared with a detailed DIgSILENT PowerFactory model of a real installation. It is concluded that using the mathematical equations for the harmonic impedance profiles could provide insight into the expected resonant frequencies in a plant and possible increase in harmonic current propagation.