The installation of Distributed Generation (DG) systems leads to harmonic distortions, unequal power sharing among the host feeders and system voltage and frequency imbalances. These power quality issues arise mostly when main grid interacts with DG systems or when they operate in islanded mode. Henceforth, with a two-step approach as this paper presents, proper frequency and voltage control of DG systems is acquired to solve these problems. In the first step, a comparison in terms of harmonic content is performed between Sinusoidal Pulse-Width-Modulation (SPWM) and Space Vector Pulse-Width-Modulation (SVPWM) techniques for interface inverters in distributed configuration. Secondly, an improved droop control method is implemented in order to regulate voltage and frequency as a function of customized droop equations. Validation of design method and parametric analysis of results is provided with the help of simulations.
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Ahsan Shahid (2015) studied this question.