Power quality issues are an important and growing problem in microgrid. There are two reasons; the more active consumer is participating in the power sector, the use of renewable energy which having a great impact on voltage variation. This paper discusses power quality disturbance and especially harmonic distortion issues in microgrid, and suggests a solution to maintain the operation of the distribution system within power quality standard. To protect sensitive loads from harmonics produced by the grid and by renewable energy sources, passive harmonic filter has been proposed in this paper. The electrical system of a nuclear research reactor as sensitive loads is designed by using Electrical Transient Analyzer Program (ETAP) software. The results show these technical issues are presented with their influence on electrical voltage and harmonic specter.

Although one of the main problems of the power quality is voltage sag in nuclear installations, the terminology used for the compensation devices is different. A Thyristor switched capacitor control is one of the equipment for voltage disturbance mitigation. This paper suggests a Thyristor Switched Capacitor control for mitigation of voltage sag in nuclear research reactor as a sensitive load. Performance of the proposed control investigated under different types of voltage sag magnitudes and is modeled using the user-defined dynamic modeling (UDM) tools in ETAP. The results show appropriate operation of the proposed control system to examine the developed technique.

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