A Fuzzy Logic controller based Multifunctional Dynamic Voltage restorer in Distribution System

M.Divya Vani
2013 IOSR Journal of Electrical and Electronics Engineering  
Voltage sag is one of major power quality problem and it became severe to industrial customers. Voltage sag can cause miss-operation to several sensitive electronic equipments. This problem can be mitigated with pre-sag voltage injection method using custom power device, Dynamic Voltage Restorer (DVR). In this paper, emergency control in distribution systems is discussed by a flux-charge-model feedback algorithm using Fuzzy Logic Controller in order to improve the transient response and
more » ... e the steady-state error in DVR response, respectively. A flux-charge-model feedback algorithm is implemented so that the DVR would act as a large virtual inductance in series with the distribution feeder in fault situations. Controlling the DVR as a virtual inductor would also ensure zero real power absorption during the DVR compensation and thus minimize the stress in the DC link. The proposed system is applied to some disturbances in load voltage caused by induction motors starting, and a three-phase short circuit fault. Simulation results show the capability of the DVR to control the emergency conditions of the distribution systems. Keywords -Dynamic voltage restorer (DVR), voltage sag, voltage swell and Fuzzy logic controller.
doi:10.9790/1676-0645563 fatcat:spklodbs2zhgdoxp37dfqryifq