The use of power electronics equipment has rapidly increased day by day and it is leading to several power quality problems. Power quality problems we are facing in the distribution systems are voltage sag, voltage swell, current harmonics, notch, spike, transients etc. Voltage sag is the major power quality (PQ) problem which affects the industrial consumers. The best way to eradicate these power quality issues is by use of custom power devices. In the distribution system, unexpected changes in the voltage amplitude will be reduced by Dynamic Voltage restorer (DVR). In this research the Multifunctional DVR is used in order to control the emergency control in distribution system. The main objective is to identify and then reimburse required voltage to compensate voltage sag. Current feedback and load voltage control with the closed-loop control is hosted as a humble technique to operate the DVR. The main idea of the proposed approach in this project is voltage at load with outer feedback loop will be used, whenever the error current not passing through the DVR. Also, to improve dynamic response of load voltage, a feed forward loop will be used. A three-phase short circuit fault current and starting of induction motor are treated as disturbance in the load voltage and proposed algorithm is applied for this disturbance. Also, the ability of the proposed DVR to limit the downstream fault current has been tested and the performance is analyzed using MATLAB/ simulink software.
July 17, 2015
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