フライバック方式インバータによる太陽光発電システム

抄録

In the usual photovoltaic systems, the PV array cannot be grounded, as the utility grid ac line is grounded. In order to ground the PV-array and not to generate the leakage current due to stray-capacitors to the ground, the single-phase inverter circuit using a pair of chopper circuits was proposed by authors several years ago. In this paper, a novel fly-back type inverter circuit is proposed both to reduce the number of required semiconductor devices by simplifying main circuit and to improve the efficiency. As the proposed circuit can generate no var-power, the power factor of connected loads must be unity, however, it is expected that the novel circuit will be applied not only to photovoltaic systems but also AC sources for high intensity discharge lamp and others.