Distributed generation based dynamic voltage restorer

Dynamic voltage restorer (DVR), either battery or rectifier supported, is proposed for compensation of voltage sag in the literature. The drawback of battery fed DVR is limited capacity. Rectifier supported DVR may not be limited, from the capacity point-of-view. But, the operation of DVR may become impractical, when the source is remotely located. One of the solutions, to overcome the above drawbacks, is distributed generation (DG). As the distributed generation (DG) sources are distributed in nature, and the capacity ranges from kilowatt (kW) to few megawatt (MW), this paper, proposes DG for energizing DVR. Modeling of DVR fed with (generator based) DG, with the main aim of voltage (injected by DVR) and speed (of the generator) control, is presented. Voltage injected by DVR (fed with a standalone generator, through a rectifier) is carried by amplitude modulation (AM). Speed control of DG, is carried by a simple PI control scheme. Simulation studies, show the (voltage sag) compensation capability of the proposed DG-fed-DVR, with faster dynamic performance.