Double Stage Grid-Tied Solar PV System Using HC-LMS Control

Abstract

This paper proposes a HC-LMS (Hyperbolic Cosine function Least Mean Square) based control technique for a double stage grid-connected solar photovoltaic array (SPVA) system. This control technique has less oscillations and swift dynamic response. This HC-LMS control technique extracts the harmonics free fundamental load current component for the switching of DC-AC converter. Moreover, it addresses various PQ (Power Quality) problems like harmonics mitigation, grid currents balancing and reactive power compensation. For efficient operation of solar PV array, an IC (Incremental Conductance) based MPPT (Maximum Power Point Tracking) technique is used to achieve crest power. This HC-LMS control technique is tested under different dynamic conditions in the laboratory and test results show the satisfactory responses. The THDs (Total Harmonic Distortions) of grid currents are achieved well within the recommended limits.