Hybrid DSC with Compensation Capability Based Control for Grid Integrated SPV System

This paper presents a hybrid delayed signal cancellation (DSC) with phase error and scaling error compensator based control algorithm for a single phase double stage grid tied solar photovoltaic (PV) system. The first stage of hybrid DSC based control is an adaptive DSC operator, which mitigates the harmonics. Two similar nonadaptive DSC operators are used to improve the filtering capability of nonadaptive operators. This control algorithm overcomes the draw-backs of both the adaptive and nonadaptive operators and there is no phase error, and scaling in the amplitude of filtered current under load perturbations, and grid frequency drift conditions. This control extracts the orthogonal load current components, to acquire the fundamental frequency sinusoidal component of grid current. This grid tied PV system works well even in cloudy session. The utilization of the VSC is increased, and an additional device is not required to improve the power quality of the utility grid current under distorted load current. Thus, the VSC payback period is reduced. The DSTATCOM (Distribution Static Compensator) to PV system and PV system to DSTATCOM mode of operations are demonstrated via experimental results. The THDs (Total Harmonics Distortions) in the grid current is meeting the limits of an IEEE-519 and an IEEE-929 Power Quality (PQ) standards.