Matrix converter based Voltage Sag Generator to test LVRT capability in renewable energy systems

The increased penetration of renewable energy systems (RESs) rises the concern about the stability and power quality of the utility grid. Therefore, some rather strict grid requirements for Low Voltage Ride-Through (LVRT) have been produced. In order to verify the response of RES under grid-voltage sag conditions, a Voltage Sag Generator (VSG) is needed. This paper presents a 5 kVA Matrix Converter based VSG to test RES in order to study the fulfillment of LVRT requirements. Voltage dips of variable magnitude, duration time and type can be generated with the proposed VSG.