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in Undetermined Small-scale distributed generators connected to the low voltage network are generally operated with unity power factor. However, controlling their reactive power injection would have an impact on the voltage at their connection point, if the network is sufficiently weak and inductive. The purpose of this paper is to investigate how a small-scale distributed generator connected to a low voltage network through a power electronic converter can be controlled to improve the voltage quality at its connection point. The possibility to control the voltage at a point in the low voltage network by reactive power injection is limited by two factors, the small rating of the distributed generator compared to the short-circuit power at its connection point and the resistive nature of the low voltage cables. Here, a scheme for inductively decoupling the distributed generator connection point from the network is proposed and evaluated. For this purpose, an inductance is placed between the network and the generator, allowing voltage regulation by reactive power injection. Simulation results and lab measurements show that the proposed scheme improves the voltage quality at the microturbine connection point. (Less)

Distributed Generation with Voltage Control Capability in the Low Voltage Network