Devices and control strategies for voltage regulation under influence of photovoltaic distributed generation. A review

Photovoltaic Distributed Generation (PV-DG) produces some technical, commercial, and regulatory challenges in distribution systems. The most important technical challenge are the overvoltages produced by a high PV-DG penetration, which modifies the voltage profiles along the network and disturbs the operation of conventional voltage regulation devices. Extensive research has been carried out using various regulation devices under different control schemes to mitigate this impact. This paper presents a review of the literature dedicated to mitigate these overvoltage problems, proposing the classification and definition of regulation devices and control schemes used.