Abstract
Microgrid (MG) integrated with Distributed Generation (DG) provides several benefits like reliable, secure, and high efficient of energy supply, while minimizing power loss, deferring expansion of power distribution infrastructures, and reduced carbon emission of energy supply etc. to the communities. Despite of the several benefits, there are several challenges existing due to the integration of different characteristics and technology of DG sources in MG network. Power Quality (PQ) issue is one of the main technical challenges in MG power system. In order to provide improved PQ of energy supply, it is necessary to analyse and quantify the PQ level in MG network. This paper investigates the detail of PQ impacts in a real MG network carried out through an experimental analysis. Voltage and frequency variations/deviations are analysed in both on-grid and off-grid mode of MG operation at varying generation and varying load conditions. Similarly unbalance voltage and current level in neutral are estimated at unbalanced PV generation and uneven load distribution in MG network. Also current and voltage THD are estimated at different PV power level. Finally the results obtained from the analysis are compared to that of Australian network standard level.
Highlights
A small entity of electrical network known as MG plays an important role to provide secure, reliable, and sustainable energy supply to the critical loads of communities
It was concluded that the variation and deviation in frequency and voltage level during on-grid mode of MG analysis were found as very minimum and within acceptable level of Australian network standard
In off-grid mode, the variation level was maintained within tolerance level of Australian network standard
Summary
A small entity of electrical network known as MG plays an important role to provide secure, reliable, and sustainable energy supply to the critical loads of communities. Journal of Power and Energy Engineering, 4, 17-34. In “grid connected” mode, the power can be exported or imported between MG and utility grid according to the energy management of the system. In case of any major fault or power disturbance in the main grid, the MG switches over to stand-alone mode while still feeding power to the critical loads effectively [2] [3]
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