1Asst. Professor, E.E.E Dept, GITAM (deemed to be university), Hyderabad, India
2Professor, E.E.E Dept, UBDTCE (VTU), Davenagere, Karnataka, India
3E.E.E Dept, GITAM (deemed to be university), Hyderabad, India
*Author correspondence: Dr. P. Vasudeva Naidu, Asst. Professor, EEE Dept, Doctorate Program, Linguistics Program Studies, GITAM (deemed to be University), Hyderabad, India
Online published on 25 April, 2019.
The main objective of paper is three-phase four-wire DVR with modified switching band controller topology is proposed, which overcomes the frequent band violation, poor controllability and heavy filter currents compared to threephase four wire DVR with conventional filter topology. In a modified switching band controller DVR, the performance of the controller depends on the values of filter components. After modified switching controller based Dynamic voltage restorer (DVR). The DVR is to mitigate all typical voltage related problems at the distribution system load center like voltage sag, voltage swell, voltage harmonics and interruptions etc. The compensation capability of this proposed topology is analyzed based on simulation studies and corresponding results are compared with different switching control strategies. The consequent merits and demerits of switching loss in VSI ripple in compensated load voltages and error between reference injected voltages and actual injected voltages in different switching control strategies are discussed. Total harmonic distortions THDs (%) of compensated load voltages, PCC voltages and source voltages are also presented.
Dynamic voltage restorer (DVR), Fixed hysteresis band controller, Adaptive hysteresis bandcontroller, Modified switching band controller, Total harmonic distortion (THD)
