DC-link capacitor selections for the single-phase grid-connected PV system
Journal
International Conference on Power Electronics and Drive Systems
Pages
72-77
Date Issued
2009
Author(s)
Abstract
The selection criteria of dc-link capacitor based on the optimal ac line current regulation strategy for the single-phase grid-connected photovoltaic (GCPV) system is proposed in this paper. The power flow of the GCPV system and the optimal ac line current regulation strategy are presented. The optimal ac line current regulation strategy can achieve dc-link voltage regulation in one ac mains cycle while minimizing the injected ac line current variation. The mathematical expression for the dc-link voltage variations and the number of ac mains cycle that the dc-link voltage stays inside the hysteresis band are derived thoroughly. The derived equations also explain the behavior of the dc-link voltage responding to the power variation of the single-phase GCPV system. As a result, the selection criteria of the dc-link capacitor can be established. Hardware experimental results have presented to verify the performance of the single-phase GCPV system.
Subjects
Ac line current regulation; Dc-link capacitor; Grid-connected PV system
SDGs
Other Subjects
Dc link capacitor; DC-link voltages; Grid connected PV system; Grid-connected; Hysteresis band; Line currents; Mathematical expressions; Power flows; Power variations; Selection criteria; Capacitance; Capacitors; Hysteresis motors; Optimization; Photovoltaic effects; Power electronics; Voltage regulators; Electric current regulators
Type
conference paper