Abstract
With the growing concerns over environmental impacts and rebate programs offered by governments, small renewable technology based distributed generation (DG) units are increasingly being used in commercial and domestic electric power production. However, a large number of DG units in a distribution system may sometimes contribute to high levels of harmonic distortion even though the emission level of individual DG units comply with the current harmonic standards. In addition, the incorporation of a passive filter within these DG units also has a negative effect due to the resonance phenomenon. Thus, this paper aims to analyse the impact of multiple inverter based DG units on resonance and harmonic distortion. Furthermore, the effect of simplifying DG model by bundling the realistic model of multiple and small DG units into a single unit were investigated. The analysis was performed for an inverter based DG system connected to the IEEE 13 bus distribution test system. To investigate resonance phenomenon, frequency scan was conducted while the fast Fourier transform analysis was carried out to measure the voltage and current distortion at the point of the common coupling and the DG connected buses. The test system was simulated using MATLAB/SimPowerSystems. The result shows that a simplified model of multiple DG units can be used as a DG model for harmonic distortion and resonance phenomenon study.
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