Novel and faster strategy for effective control of single phase DVR

Abstract

Due to evolution in the power system, the emergence of smaller generating systems such as micro turbines, Wind Turbines, Solar PV system, etc., have opened new opportunities for onsite power generation which is located at user's site called Distributed Energy Resources (DER). The significant potential of DER to meet customers need and utilities independently can be captured by organizing these resources into Microgrid. With the ever increasing use of Power Electronics devices, Power Quality has become a major concern for utility operators as well as consumers. Power Quality mainly affect due to disturbances like voltage sag, swell, transients (oscillatory and impulsive) momentary interruptions, harmonics, flicker etc. This necessitates monitoring and estimation of these disturbances continuously so that it can be corrected almost instantly. The different methods for power quality indices estimation are RLS, LMS, LES, FFT, Kalman Filter, Wavelet Transform, etc. In this paper very simple and thus faster, Modified Recursive Gauss Newton (MRGN) algorithm for power Quality estimation is used. This estimation is done for the output terminals of the DG and it is further used for a simple control strategy of single phase Dynamic Voltage Restorer (DVR), a series compensating device for power quality improvement in terms of Voltage Sag, Swell and Harmonics during supply disturbances.